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2134
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1 /*
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2 * copyright (c) 2001 Fabrice Bellard
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3 *
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4 * This file is part of FFmpeg.
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5 *
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6 * FFmpeg is free software; you can redistribute it and/or
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7 * modify it under the terms of the GNU Lesser General Public
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8 * License as published by the Free Software Foundation; either
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9 * version 2.1 of the License, or (at your option) any later version.
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10 *
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11 * FFmpeg is distributed in the hope that it will be useful,
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12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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14 * Lesser General Public License for more details.
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15 *
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16 * You should have received a copy of the GNU Lesser General Public
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17 * License along with FFmpeg; if not, write to the Free Software
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18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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19 */
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20
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21 #ifndef AVFORMAT_AVFORMAT_H
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22 #define AVFORMAT_AVFORMAT_H
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23
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24 /**
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25 * @file
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26 * @ingroup libavf
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27 * Main libavformat public API header
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28 */
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29
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30 /**
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31 * @defgroup libavf I/O and Muxing/Demuxing Library
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32 * @{
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33 *
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34 * Libavformat (lavf) is a library for dealing with various media container
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35 * formats. Its main two purposes are demuxing - i.e. splitting a media file
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36 * into component streams, and the reverse process of muxing - writing supplied
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37 * data in a specified container format. It also has an @ref lavf_io
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38 * "I/O module" which supports a number of protocols for accessing the data (e.g.
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39 * file, tcp, http and others). Before using lavf, you need to call
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40 * av_register_all() to register all compiled muxers, demuxers and protocols.
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41 * Unless you are absolutely sure you won't use libavformat's network
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42 * capabilities, you should also call avformat_network_init().
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43 *
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44 * A supported input format is described by an AVInputFormat struct, conversely
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45 * an output format is described by AVOutputFormat. You can iterate over all
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46 * registered input/output formats using the av_iformat_next() /
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47 * av_oformat_next() functions. The protocols layer is not part of the public
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48 * API, so you can only get the names of supported protocols with the
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49 * avio_enum_protocols() function.
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50 *
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51 * Main lavf structure used for both muxing and demuxing is AVFormatContext,
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52 * which exports all information about the file being read or written. As with
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53 * most Libavformat structures, its size is not part of public ABI, so it cannot be
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54 * allocated on stack or directly with av_malloc(). To create an
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55 * AVFormatContext, use avformat_alloc_context() (some functions, like
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56 * avformat_open_input() might do that for you).
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57 *
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58 * Most importantly an AVFormatContext contains:
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59 * @li the @ref AVFormatContext.iformat "input" or @ref AVFormatContext.oformat
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60 * "output" format. It is either autodetected or set by user for input;
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61 * always set by user for output.
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62 * @li an @ref AVFormatContext.streams "array" of AVStreams, which describe all
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63 * elementary streams stored in the file. AVStreams are typically referred to
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64 * using their index in this array.
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65 * @li an @ref AVFormatContext.pb "I/O context". It is either opened by lavf or
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66 * set by user for input, always set by user for output (unless you are dealing
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67 * with an AVFMT_NOFILE format).
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68 *
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69 * @section lavf_options Passing options to (de)muxers
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70 * Lavf allows to configure muxers and demuxers using the @ref avoptions
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71 * mechanism. Generic (format-independent) libavformat options are provided by
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72 * AVFormatContext, they can be examined from a user program by calling
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73 * av_opt_next() / av_opt_find() on an allocated AVFormatContext (or its AVClass
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74 * from avformat_get_class()). Private (format-specific) options are provided by
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75 * AVFormatContext.priv_data if and only if AVInputFormat.priv_class /
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76 * AVOutputFormat.priv_class of the corresponding format struct is non-NULL.
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77 * Further options may be provided by the @ref AVFormatContext.pb "I/O context",
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78 * if its AVClass is non-NULL, and the protocols layer. See the discussion on
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79 * nesting in @ref avoptions documentation to learn how to access those.
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80 *
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81 * @defgroup lavf_decoding Demuxing
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82 * @{
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83 * Demuxers read a media file and split it into chunks of data (@em packets). A
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84 * @ref AVPacket "packet" contains one or more encoded frames which belongs to a
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85 * single elementary stream. In the lavf API this process is represented by the
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86 * avformat_open_input() function for opening a file, av_read_frame() for
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87 * reading a single packet and finally avformat_close_input(), which does the
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88 * cleanup.
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89 *
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90 * @section lavf_decoding_open Opening a media file
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91 * The minimum information required to open a file is its URL or filename, which
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92 * is passed to avformat_open_input(), as in the following code:
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93 * @code
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94 * const char *url = "in.mp3";
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95 * AVFormatContext *s = NULL;
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96 * int ret = avformat_open_input(&s, url, NULL, NULL);
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97 * if (ret < 0)
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98 * abort();
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99 * @endcode
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100 * The above code attempts to allocate an AVFormatContext, open the
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101 * specified file (autodetecting the format) and read the header, exporting the
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102 * information stored there into s. Some formats do not have a header or do not
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103 * store enough information there, so it is recommended that you call the
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104 * avformat_find_stream_info() function which tries to read and decode a few
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105 * frames to find missing information.
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106 *
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107 * In some cases you might want to preallocate an AVFormatContext yourself with
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108 * avformat_alloc_context() and do some tweaking on it before passing it to
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109 * avformat_open_input(). One such case is when you want to use custom functions
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110 * for reading input data instead of lavf internal I/O layer.
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111 * To do that, create your own AVIOContext with avio_alloc_context(), passing
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112 * your reading callbacks to it. Then set the @em pb field of your
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113 * AVFormatContext to newly created AVIOContext.
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114 *
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115 * Since the format of the opened file is in general not known until after
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116 * avformat_open_input() has returned, it is not possible to set demuxer private
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117 * options on a preallocated context. Instead, the options should be passed to
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118 * avformat_open_input() wrapped in an AVDictionary:
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119 * @code
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120 * AVDictionary *options = NULL;
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121 * av_dict_set(&options, "video_size", "640x480", 0);
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122 * av_dict_set(&options, "pixel_format", "rgb24", 0);
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123 *
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124 * if (avformat_open_input(&s, url, NULL, &options) < 0)
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125 * abort();
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126 * av_dict_free(&options);
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127 * @endcode
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128 * This code passes the private options 'video_size' and 'pixel_format' to the
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129 * demuxer. They would be necessary for e.g. the rawvideo demuxer, since it
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130 * cannot know how to interpret raw video data otherwise. If the format turns
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131 * out to be something different than raw video, those options will not be
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132 * recognized by the demuxer and therefore will not be applied. Such unrecognized
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133 * options are then returned in the options dictionary (recognized options are
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134 * consumed). The calling program can handle such unrecognized options as it
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135 * wishes, e.g.
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136 * @code
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137 * AVDictionaryEntry *e;
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138 * if (e = av_dict_get(options, "", NULL, AV_DICT_IGNORE_SUFFIX)) {
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139 * fprintf(stderr, "Option %s not recognized by the demuxer.\n", e->key);
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140 * abort();
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141 * }
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142 * @endcode
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143 *
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144 * After you have finished reading the file, you must close it with
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145 * avformat_close_input(). It will free everything associated with the file.
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146 *
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147 * @section lavf_decoding_read Reading from an opened file
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148 * Reading data from an opened AVFormatContext is done by repeatedly calling
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149 * av_read_frame() on it. Each call, if successful, will return an AVPacket
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150 * containing encoded data for one AVStream, identified by
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151 * AVPacket.stream_index. This packet may be passed straight into the libavcodec
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152 * decoding functions avcodec_decode_video2(), avcodec_decode_audio4() or
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153 * avcodec_decode_subtitle2() if the caller wishes to decode the data.
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154 *
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155 * AVPacket.pts, AVPacket.dts and AVPacket.duration timing information will be
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156 * set if known. They may also be unset (i.e. AV_NOPTS_VALUE for
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157 * pts/dts, 0 for duration) if the stream does not provide them. The timing
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158 * information will be in AVStream.time_base units, i.e. it has to be
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159 * multiplied by the timebase to convert them to seconds.
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160 *
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161 * If AVPacket.buf is set on the returned packet, then the packet is
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162 * allocated dynamically and the user may keep it indefinitely.
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163 * Otherwise, if AVPacket.buf is NULL, the packet data is backed by a
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164 * static storage somewhere inside the demuxer and the packet is only valid
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165 * until the next av_read_frame() call or closing the file. If the caller
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166 * requires a longer lifetime, av_dup_packet() will make an av_malloc()ed copy
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167 * of it.
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168 * In both cases, the packet must be freed with av_free_packet() when it is no
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169 * longer needed.
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170 *
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171 * @section lavf_decoding_seek Seeking
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172 * @}
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173 *
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174 * @defgroup lavf_encoding Muxing
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175 * @{
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176 * @}
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177 *
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178 * @defgroup lavf_io I/O Read/Write
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179 * @{
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180 * @}
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181 *
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182 * @defgroup lavf_codec Demuxers
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183 * @{
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184 * @defgroup lavf_codec_native Native Demuxers
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185 * @{
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186 * @}
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187 * @defgroup lavf_codec_wrappers External library wrappers
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188 * @{
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189 * @}
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190 * @}
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191 * @defgroup lavf_protos I/O Protocols
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192 * @{
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193 * @}
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194 * @defgroup lavf_internal Internal
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195 * @{
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196 * @}
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197 * @}
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198 *
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199 */
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200
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201 #include <time.h>
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202 #include <stdio.h> /* FILE */
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203 #include "../libavcodec/avcodec.h"
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204 #include "../libavutil/dict.h"
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205 #include "../libavutil/log.h"
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206
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207 #include "avio.h"
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208 #include "version.h"
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209
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210 struct AVFormatContext;
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211
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212
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213 /**
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214 * @defgroup metadata_api Public Metadata API
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215 * @{
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216 * @ingroup libavf
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217 * The metadata API allows libavformat to export metadata tags to a client
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218 * application when demuxing. Conversely it allows a client application to
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219 * set metadata when muxing.
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220 *
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221 * Metadata is exported or set as pairs of key/value strings in the 'metadata'
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222 * fields of the AVFormatContext, AVStream, AVChapter and AVProgram structs
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223 * using the @ref lavu_dict "AVDictionary" API. Like all strings in FFmpeg,
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224 * metadata is assumed to be UTF-8 encoded Unicode. Note that metadata
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225 * exported by demuxers isn't checked to be valid UTF-8 in most cases.
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226 *
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227 * Important concepts to keep in mind:
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228 * - Keys are unique; there can never be 2 tags with the same key. This is
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229 * also meant semantically, i.e., a demuxer should not knowingly produce
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230 * several keys that are literally different but semantically identical.
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231 * E.g., key=Author5, key=Author6. In this example, all authors must be
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232 * placed in the same tag.
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233 * - Metadata is flat, not hierarchical; there are no subtags. If you
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234 * want to store, e.g., the email address of the child of producer Alice
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235 * and actor Bob, that could have key=alice_and_bobs_childs_email_address.
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236 * - Several modifiers can be applied to the tag name. This is done by
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237 * appending a dash character ('-') and the modifier name in the order
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238 * they appear in the list below -- e.g. foo-eng-sort, not foo-sort-eng.
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239 * - language -- a tag whose value is localized for a particular language
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240 * is appended with the ISO 639-2/B 3-letter language code.
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241 * For example: Author-ger=Michael, Author-eng=Mike
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242 * The original/default language is in the unqualified "Author" tag.
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243 * A demuxer should set a default if it sets any translated tag.
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244 * - sorting -- a modified version of a tag that should be used for
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245 * sorting will have '-sort' appended. E.g. artist="The Beatles",
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246 * artist-sort="Beatles, The".
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247 *
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248 * - Demuxers attempt to export metadata in a generic format, however tags
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249 * with no generic equivalents are left as they are stored in the container.
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250 * Follows a list of generic tag names:
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251 *
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252 @verbatim
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253 album -- name of the set this work belongs to
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254 album_artist -- main creator of the set/album, if different from artist.
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255 e.g. "Various Artists" for compilation albums.
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256 artist -- main creator of the work
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257 comment -- any additional description of the file.
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258 composer -- who composed the work, if different from artist.
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259 copyright -- name of copyright holder.
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260 creation_time-- date when the file was created, preferably in ISO 8601.
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261 date -- date when the work was created, preferably in ISO 8601.
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262 disc -- number of a subset, e.g. disc in a multi-disc collection.
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263 encoder -- name/settings of the software/hardware that produced the file.
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264 encoded_by -- person/group who created the file.
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265 filename -- original name of the file.
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266 genre -- <self-evident>.
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267 language -- main language in which the work is performed, preferably
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268 in ISO 639-2 format. Multiple languages can be specified by
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269 separating them with commas.
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270 performer -- artist who performed the work, if different from artist.
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271 E.g for "Also sprach Zarathustra", artist would be "Richard
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272 Strauss" and performer "London Philharmonic Orchestra".
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273 publisher -- name of the label/publisher.
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274 service_name -- name of the service in broadcasting (channel name).
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275 service_provider -- name of the service provider in broadcasting.
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276 title -- name of the work.
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277 track -- number of this work in the set, can be in form current/total.
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278 variant_bitrate -- the total bitrate of the bitrate variant that the current stream is part of
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279 @endverbatim
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280 *
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281 * Look in the examples section for an application example how to use the Metadata API.
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282 *
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283 * @}
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284 */
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285
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286 /* packet functions */
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287
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288
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289 /**
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290 * Allocate and read the payload of a packet and initialize its
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291 * fields with default values.
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292 *
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293 * @param pkt packet
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294 * @param size desired payload size
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295 * @return >0 (read size) if OK, AVERROR_xxx otherwise
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296 */
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297 int av_get_packet(AVIOContext *s, AVPacket *pkt, int size);
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298
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299
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300 /**
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301 * Read data and append it to the current content of the AVPacket.
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302 * If pkt->size is 0 this is identical to av_get_packet.
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303 * Note that this uses av_grow_packet and thus involves a realloc
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304 * which is inefficient. Thus this function should only be used
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305 * when there is no reasonable way to know (an upper bound of)
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306 * the final size.
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307 *
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308 * @param pkt packet
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309 * @param size amount of data to read
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310 * @return >0 (read size) if OK, AVERROR_xxx otherwise, previous data
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311 * will not be lost even if an error occurs.
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312 */
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313 int av_append_packet(AVIOContext *s, AVPacket *pkt, int size);
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314
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315 /*************************************************/
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316 /* fractional numbers for exact pts handling */
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317
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318 /**
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319 * The exact value of the fractional number is: 'val + num / den'.
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320 * num is assumed to be 0 <= num < den.
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321 */
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322 typedef struct AVFrac {
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323 int64_t val, num, den;
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324 } AVFrac;
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325
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326 /*************************************************/
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327 /* input/output formats */
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328
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329 struct AVCodecTag;
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330
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331 /**
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332 * This structure contains the data a format has to probe a file.
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333 */
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334 typedef struct AVProbeData {
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335 const char *filename;
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336 unsigned char *buf; /**< Buffer must have AVPROBE_PADDING_SIZE of extra allocated bytes filled with zero. */
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337 int buf_size; /**< Size of buf except extra allocated bytes */
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338 } AVProbeData;
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339
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340 #define AVPROBE_SCORE_RETRY (AVPROBE_SCORE_MAX/4)
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341 #define AVPROBE_SCORE_EXTENSION 50 ///< score for file extension
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342 #define AVPROBE_SCORE_MAX 100 ///< maximum score
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343
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344 #define AVPROBE_PADDING_SIZE 32 ///< extra allocated bytes at the end of the probe buffer
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345
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346 /// Demuxer will use avio_open, no opened file should be provided by the caller.
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347 #define AVFMT_NOFILE 0x0001
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348 #define AVFMT_NEEDNUMBER 0x0002 /**< Needs '%d' in filename. */
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349 #define AVFMT_SHOW_IDS 0x0008 /**< Show format stream IDs numbers. */
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350 #define AVFMT_RAWPICTURE 0x0020 /**< Format wants AVPicture structure for
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351 raw picture data. */
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352 #define AVFMT_GLOBALHEADER 0x0040 /**< Format wants global header. */
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353 #define AVFMT_NOTIMESTAMPS 0x0080 /**< Format does not need / have any timestamps. */
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354 #define AVFMT_GENERIC_INDEX 0x0100 /**< Use generic index building code. */
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355 #define AVFMT_TS_DISCONT 0x0200 /**< Format allows timestamp discontinuities. Note, muxers always require valid (monotone) timestamps */
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356 #define AVFMT_VARIABLE_FPS 0x0400 /**< Format allows variable fps. */
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|
|
357 #define AVFMT_NODIMENSIONS 0x0800 /**< Format does not need width/height */
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|
|
358 #define AVFMT_NOSTREAMS 0x1000 /**< Format does not require any streams */
|
|
|
359 #define AVFMT_NOBINSEARCH 0x2000 /**< Format does not allow to fall back on binary search via read_timestamp */
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|
|
360 #define AVFMT_NOGENSEARCH 0x4000 /**< Format does not allow to fall back on generic search */
|
|
|
361 #define AVFMT_NO_BYTE_SEEK 0x8000 /**< Format does not allow seeking by bytes */
|
|
|
362 #define AVFMT_ALLOW_FLUSH 0x10000 /**< Format allows flushing. If not set, the muxer will not receive a NULL packet in the write_packet function. */
|
|
|
363 #if LIBAVFORMAT_VERSION_MAJOR <= 54
|
|
|
364 #define AVFMT_TS_NONSTRICT 0x8020000 //we try to be compatible to the ABIs of ffmpeg and major forks
|
|
|
365 #else
|
|
|
366 #define AVFMT_TS_NONSTRICT 0x20000
|
|
|
367 #endif
|
|
|
368 /**< Format does not require strictly
|
|
|
369 increasing timestamps, but they must
|
|
|
370 still be monotonic */
|
|
|
371 #define AVFMT_TS_NEGATIVE 0x40000 /**< Format allows muxing negative
|
|
|
372 timestamps. If not set the timestamp
|
|
|
373 will be shifted in av_write_frame and
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|
|
374 av_interleaved_write_frame so they
|
|
|
375 start from 0.
|
|
|
376 The user or muxer can override this through
|
|
|
377 AVFormatContext.avoid_negative_ts
|
|
|
378 */
|
|
|
379
|
|
|
380 #define AVFMT_SEEK_TO_PTS 0x4000000 /**< Seeking is based on PTS */
|
|
|
381
|
|
|
382 /**
|
|
|
383 * @addtogroup lavf_encoding
|
|
|
384 * @{
|
|
|
385 */
|
|
|
386 typedef struct AVOutputFormat {
|
|
|
387 const char *name;
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|
|
388 /**
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|
|
389 * Descriptive name for the format, meant to be more human-readable
|
|
|
390 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
|
|
|
391 * to define it.
|
|
|
392 */
|
|
|
393 const char *long_name;
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|
|
394 const char *mime_type;
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|
|
395 const char *extensions; /**< comma-separated filename extensions */
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|
|
396 /* output support */
|
|
|
397 enum AVCodecID audio_codec; /**< default audio codec */
|
|
|
398 enum AVCodecID video_codec; /**< default video codec */
|
|
|
399 enum AVCodecID subtitle_codec; /**< default subtitle codec */
|
|
|
400 /**
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|
|
401 * can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_RAWPICTURE,
|
|
|
402 * AVFMT_GLOBALHEADER, AVFMT_NOTIMESTAMPS, AVFMT_VARIABLE_FPS,
|
|
|
403 * AVFMT_NODIMENSIONS, AVFMT_NOSTREAMS, AVFMT_ALLOW_FLUSH,
|
|
|
404 * AVFMT_TS_NONSTRICT
|
|
|
405 */
|
|
|
406 int flags;
|
|
|
407
|
|
|
408 /**
|
|
|
409 * List of supported codec_id-codec_tag pairs, ordered by "better
|
|
|
410 * choice first". The arrays are all terminated by AV_CODEC_ID_NONE.
|
|
|
411 */
|
|
|
412 const struct AVCodecTag * const *codec_tag;
|
|
|
413
|
|
|
414
|
|
|
415 const AVClass *priv_class; ///< AVClass for the private context
|
|
|
416
|
|
|
417 /*****************************************************************
|
|
|
418 * No fields below this line are part of the public API. They
|
|
|
419 * may not be used outside of libavformat and can be changed and
|
|
|
420 * removed at will.
|
|
|
421 * New public fields should be added right above.
|
|
|
422 *****************************************************************
|
|
|
423 */
|
|
|
424 struct AVOutputFormat *next;
|
|
|
425 /**
|
|
|
426 * size of private data so that it can be allocated in the wrapper
|
|
|
427 */
|
|
|
428 int priv_data_size;
|
|
|
429
|
|
|
430 int (*write_header)(struct AVFormatContext *);
|
|
|
431 /**
|
|
|
432 * Write a packet. If AVFMT_ALLOW_FLUSH is set in flags,
|
|
|
433 * pkt can be NULL in order to flush data buffered in the muxer.
|
|
|
434 * When flushing, return 0 if there still is more data to flush,
|
|
|
435 * or 1 if everything was flushed and there is no more buffered
|
|
|
436 * data.
|
|
|
437 */
|
|
|
438 int (*write_packet)(struct AVFormatContext *, AVPacket *pkt);
|
|
|
439 int (*write_trailer)(struct AVFormatContext *);
|
|
|
440 /**
|
|
|
441 * Currently only used to set pixel format if not YUV420P.
|
|
|
442 */
|
|
|
443 int (*interleave_packet)(struct AVFormatContext *, AVPacket *out,
|
|
|
444 AVPacket *in, int flush);
|
|
|
445 /**
|
|
|
446 * Test if the given codec can be stored in this container.
|
|
|
447 *
|
|
|
448 * @return 1 if the codec is supported, 0 if it is not.
|
|
|
449 * A negative number if unknown.
|
|
|
450 * MKTAG('A', 'P', 'I', 'C') if the codec is only supported as AV_DISPOSITION_ATTACHED_PIC
|
|
|
451 */
|
|
|
452 int (*query_codec)(enum AVCodecID id, int std_compliance);
|
|
|
453
|
|
|
454 void (*get_output_timestamp)(struct AVFormatContext *s, int stream,
|
|
|
455 int64_t *dts, int64_t *wall);
|
|
|
456 } AVOutputFormat;
|
|
|
457 /**
|
|
|
458 * @}
|
|
|
459 */
|
|
|
460
|
|
|
461 /**
|
|
|
462 * @addtogroup lavf_decoding
|
|
|
463 * @{
|
|
|
464 */
|
|
|
465 typedef struct AVInputFormat {
|
|
|
466 /**
|
|
|
467 * A comma separated list of short names for the format. New names
|
|
|
468 * may be appended with a minor bump.
|
|
|
469 */
|
|
|
470 const char *name;
|
|
|
471
|
|
|
472 /**
|
|
|
473 * Descriptive name for the format, meant to be more human-readable
|
|
|
474 * than name. You should use the NULL_IF_CONFIG_SMALL() macro
|
|
|
475 * to define it.
|
|
|
476 */
|
|
|
477 const char *long_name;
|
|
|
478
|
|
|
479 /**
|
|
|
480 * Can use flags: AVFMT_NOFILE, AVFMT_NEEDNUMBER, AVFMT_SHOW_IDS,
|
|
|
481 * AVFMT_GENERIC_INDEX, AVFMT_TS_DISCONT, AVFMT_NOBINSEARCH,
|
|
|
482 * AVFMT_NOGENSEARCH, AVFMT_NO_BYTE_SEEK, AVFMT_SEEK_TO_PTS.
|
|
|
483 */
|
|
|
484 int flags;
|
|
|
485
|
|
|
486 /**
|
|
|
487 * If extensions are defined, then no probe is done. You should
|
|
|
488 * usually not use extension format guessing because it is not
|
|
|
489 * reliable enough
|
|
|
490 */
|
|
|
491 const char *extensions;
|
|
|
492
|
|
|
493 const struct AVCodecTag * const *codec_tag;
|
|
|
494
|
|
|
495 const AVClass *priv_class; ///< AVClass for the private context
|
|
|
496
|
|
|
497 /*****************************************************************
|
|
|
498 * No fields below this line are part of the public API. They
|
|
|
499 * may not be used outside of libavformat and can be changed and
|
|
|
500 * removed at will.
|
|
|
501 * New public fields should be added right above.
|
|
|
502 *****************************************************************
|
|
|
503 */
|
|
|
504 struct AVInputFormat *next;
|
|
|
505
|
|
|
506 /**
|
|
|
507 * Raw demuxers store their codec ID here.
|
|
|
508 */
|
|
|
509 int raw_codec_id;
|
|
|
510
|
|
|
511 /**
|
|
|
512 * Size of private data so that it can be allocated in the wrapper.
|
|
|
513 */
|
|
|
514 int priv_data_size;
|
|
|
515
|
|
|
516 /**
|
|
|
517 * Tell if a given file has a chance of being parsed as this format.
|
|
|
518 * The buffer provided is guaranteed to be AVPROBE_PADDING_SIZE bytes
|
|
|
519 * big so you do not have to check for that unless you need more.
|
|
|
520 */
|
|
|
521 int (*read_probe)(AVProbeData *);
|
|
|
522
|
|
|
523 /**
|
|
|
524 * Read the format header and initialize the AVFormatContext
|
|
|
525 * structure. Return 0 if OK. Only used in raw format right
|
|
|
526 * now. 'avformat_new_stream' should be called to create new streams.
|
|
|
527 */
|
|
|
528 int (*read_header)(struct AVFormatContext *);
|
|
|
529
|
|
|
530 /**
|
|
|
531 * Read one packet and put it in 'pkt'. pts and flags are also
|
|
|
532 * set. 'avformat_new_stream' can be called only if the flag
|
|
|
533 * AVFMTCTX_NOHEADER is used and only in the calling thread (not in a
|
|
|
534 * background thread).
|
|
|
535 * @return 0 on success, < 0 on error.
|
|
|
536 * When returning an error, pkt must not have been allocated
|
|
|
537 * or must be freed before returning
|
|
|
538 */
|
|
|
539 int (*read_packet)(struct AVFormatContext *, AVPacket *pkt);
|
|
|
540
|
|
|
541 /**
|
|
|
542 * Close the stream. The AVFormatContext and AVStreams are not
|
|
|
543 * freed by this function
|
|
|
544 */
|
|
|
545 int (*read_close)(struct AVFormatContext *);
|
|
|
546
|
|
|
547 /**
|
|
|
548 * Seek to a given timestamp relative to the frames in
|
|
|
549 * stream component stream_index.
|
|
|
550 * @param stream_index Must not be -1.
|
|
|
551 * @param flags Selects which direction should be preferred if no exact
|
|
|
552 * match is available.
|
|
|
553 * @return >= 0 on success (but not necessarily the new offset)
|
|
|
554 */
|
|
|
555 int (*read_seek)(struct AVFormatContext *,
|
|
|
556 int stream_index, int64_t timestamp, int flags);
|
|
|
557
|
|
|
558 /**
|
|
|
559 * Get the next timestamp in stream[stream_index].time_base units.
|
|
|
560 * @return the timestamp or AV_NOPTS_VALUE if an error occurred
|
|
|
561 */
|
|
|
562 int64_t (*read_timestamp)(struct AVFormatContext *s, int stream_index,
|
|
|
563 int64_t *pos, int64_t pos_limit);
|
|
|
564
|
|
|
565 /**
|
|
|
566 * Start/resume playing - only meaningful if using a network-based format
|
|
|
567 * (RTSP).
|
|
|
568 */
|
|
|
569 int (*read_play)(struct AVFormatContext *);
|
|
|
570
|
|
|
571 /**
|
|
|
572 * Pause playing - only meaningful if using a network-based format
|
|
|
573 * (RTSP).
|
|
|
574 */
|
|
|
575 int (*read_pause)(struct AVFormatContext *);
|
|
|
576
|
|
|
577 /**
|
|
|
578 * Seek to timestamp ts.
|
|
|
579 * Seeking will be done so that the point from which all active streams
|
|
|
580 * can be presented successfully will be closest to ts and within min/max_ts.
|
|
|
581 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
|
|
|
582 */
|
|
|
583 int (*read_seek2)(struct AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
|
|
|
584 } AVInputFormat;
|
|
|
585 /**
|
|
|
586 * @}
|
|
|
587 */
|
|
|
588
|
|
|
589 enum AVStreamParseType {
|
|
|
590 AVSTREAM_PARSE_NONE,
|
|
|
591 AVSTREAM_PARSE_FULL, /**< full parsing and repack */
|
|
|
592 AVSTREAM_PARSE_HEADERS, /**< Only parse headers, do not repack. */
|
|
|
593 AVSTREAM_PARSE_TIMESTAMPS, /**< full parsing and interpolation of timestamps for frames not starting on a packet boundary */
|
|
|
594 AVSTREAM_PARSE_FULL_ONCE, /**< full parsing and repack of the first frame only, only implemented for H.264 currently */
|
|
|
595 AVSTREAM_PARSE_FULL_RAW=MKTAG(0,'R','A','W'), /**< full parsing and repack with timestamp and position generation by parser for raw
|
|
|
596 this assumes that each packet in the file contains no demuxer level headers and
|
|
|
597 just codec level data, otherwise position generation would fail */
|
|
|
598 };
|
|
|
599
|
|
|
600 typedef struct AVIndexEntry {
|
|
|
601 int64_t pos;
|
|
|
602 int64_t timestamp; /**<
|
|
|
603 * Timestamp in AVStream.time_base units, preferably the time from which on correctly decoded frames are available
|
|
|
604 * when seeking to this entry. That means preferable PTS on keyframe based formats.
|
|
|
605 * But demuxers can choose to store a different timestamp, if it is more convenient for the implementation or nothing better
|
|
|
606 * is known
|
|
|
607 */
|
|
|
608 #define AVINDEX_KEYFRAME 0x0001
|
|
|
609 int flags:2;
|
|
|
610 int size:30; //Yeah, trying to keep the size of this small to reduce memory requirements (it is 24 vs. 32 bytes due to possible 8-byte alignment).
|
|
|
611 int min_distance; /**< Minimum distance between this and the previous keyframe, used to avoid unneeded searching. */
|
|
|
612 } AVIndexEntry;
|
|
|
613
|
|
|
614 #define AV_DISPOSITION_DEFAULT 0x0001
|
|
|
615 #define AV_DISPOSITION_DUB 0x0002
|
|
|
616 #define AV_DISPOSITION_ORIGINAL 0x0004
|
|
|
617 #define AV_DISPOSITION_COMMENT 0x0008
|
|
|
618 #define AV_DISPOSITION_LYRICS 0x0010
|
|
|
619 #define AV_DISPOSITION_KARAOKE 0x0020
|
|
|
620
|
|
|
621 /**
|
|
|
622 * Track should be used during playback by default.
|
|
|
623 * Useful for subtitle track that should be displayed
|
|
|
624 * even when user did not explicitly ask for subtitles.
|
|
|
625 */
|
|
|
626 #define AV_DISPOSITION_FORCED 0x0040
|
|
|
627 #define AV_DISPOSITION_HEARING_IMPAIRED 0x0080 /**< stream for hearing impaired audiences */
|
|
|
628 #define AV_DISPOSITION_VISUAL_IMPAIRED 0x0100 /**< stream for visual impaired audiences */
|
|
|
629 #define AV_DISPOSITION_CLEAN_EFFECTS 0x0200 /**< stream without voice */
|
|
|
630 /**
|
|
|
631 * The stream is stored in the file as an attached picture/"cover art" (e.g.
|
|
|
632 * APIC frame in ID3v2). The single packet associated with it will be returned
|
|
|
633 * among the first few packets read from the file unless seeking takes place.
|
|
|
634 * It can also be accessed at any time in AVStream.attached_pic.
|
|
|
635 */
|
|
|
636 #define AV_DISPOSITION_ATTACHED_PIC 0x0400
|
|
|
637
|
|
|
638 /**
|
|
|
639 * Options for behavior on timestamp wrap detection.
|
|
|
640 */
|
|
|
641 #define AV_PTS_WRAP_IGNORE 0 ///< ignore the wrap
|
|
|
642 #define AV_PTS_WRAP_ADD_OFFSET 1 ///< add the format specific offset on wrap detection
|
|
|
643 #define AV_PTS_WRAP_SUB_OFFSET -1 ///< subtract the format specific offset on wrap detection
|
|
|
644
|
|
|
645 /**
|
|
|
646 * Stream structure.
|
|
|
647 * New fields can be added to the end with minor version bumps.
|
|
|
648 * Removal, reordering and changes to existing fields require a major
|
|
|
649 * version bump.
|
|
|
650 * sizeof(AVStream) must not be used outside libav*.
|
|
|
651 */
|
|
|
652 typedef struct AVStream {
|
|
|
653 int index; /**< stream index in AVFormatContext */
|
|
|
654 /**
|
|
|
655 * Format-specific stream ID.
|
|
|
656 * decoding: set by libavformat
|
|
|
657 * encoding: set by the user, replaced by libavformat if left unset
|
|
|
658 */
|
|
|
659 int id;
|
|
|
660 /**
|
|
|
661 * Codec context associated with this stream. Allocated and freed by
|
|
|
662 * libavformat.
|
|
|
663 *
|
|
|
664 * - decoding: The demuxer exports codec information stored in the headers
|
|
|
665 * here.
|
|
|
666 * - encoding: The user sets codec information, the muxer writes it to the
|
|
|
667 * output. Mandatory fields as specified in AVCodecContext
|
|
|
668 * documentation must be set even if this AVCodecContext is
|
|
|
669 * not actually used for encoding.
|
|
|
670 */
|
|
|
671 AVCodecContext *codec;
|
|
|
672 void *priv_data;
|
|
|
673
|
|
|
674 /**
|
|
|
675 * encoding: pts generation when outputting stream
|
|
|
676 */
|
|
|
677 struct AVFrac pts;
|
|
|
678
|
|
|
679 /**
|
|
|
680 * This is the fundamental unit of time (in seconds) in terms
|
|
|
681 * of which frame timestamps are represented.
|
|
|
682 *
|
|
|
683 * decoding: set by libavformat
|
|
|
684 * encoding: set by libavformat in avformat_write_header. The muxer may use the
|
|
|
685 * user-provided value of @ref AVCodecContext.time_base "codec->time_base"
|
|
|
686 * as a hint.
|
|
|
687 */
|
|
|
688 AVRational time_base;
|
|
|
689
|
|
|
690 /**
|
|
|
691 * Decoding: pts of the first frame of the stream in presentation order, in stream time base.
|
|
|
692 * Only set this if you are absolutely 100% sure that the value you set
|
|
|
693 * it to really is the pts of the first frame.
|
|
|
694 * This may be undefined (AV_NOPTS_VALUE).
|
|
|
695 * @note The ASF header does NOT contain a correct start_time the ASF
|
|
|
696 * demuxer must NOT set this.
|
|
|
697 */
|
|
|
698 int64_t start_time;
|
|
|
699
|
|
|
700 /**
|
|
|
701 * Decoding: duration of the stream, in stream time base.
|
|
|
702 * If a source file does not specify a duration, but does specify
|
|
|
703 * a bitrate, this value will be estimated from bitrate and file size.
|
|
|
704 */
|
|
|
705 int64_t duration;
|
|
|
706
|
|
|
707 int64_t nb_frames; ///< number of frames in this stream if known or 0
|
|
|
708
|
|
|
709 int disposition; /**< AV_DISPOSITION_* bit field */
|
|
|
710
|
|
|
711 enum AVDiscard discard; ///< Selects which packets can be discarded at will and do not need to be demuxed.
|
|
|
712
|
|
|
713 /**
|
|
|
714 * sample aspect ratio (0 if unknown)
|
|
|
715 * - encoding: Set by user.
|
|
|
716 * - decoding: Set by libavformat.
|
|
|
717 */
|
|
|
718 AVRational sample_aspect_ratio;
|
|
|
719
|
|
|
720 AVDictionary *metadata;
|
|
|
721
|
|
|
722 /**
|
|
|
723 * Average framerate
|
|
|
724 */
|
|
|
725 AVRational avg_frame_rate;
|
|
|
726
|
|
|
727 /**
|
|
|
728 * For streams with AV_DISPOSITION_ATTACHED_PIC disposition, this packet
|
|
|
729 * will contain the attached picture.
|
|
|
730 *
|
|
|
731 * decoding: set by libavformat, must not be modified by the caller.
|
|
|
732 * encoding: unused
|
|
|
733 */
|
|
|
734 AVPacket attached_pic;
|
|
|
735
|
|
|
736 /**
|
|
|
737 * Real base framerate of the stream.
|
|
|
738 * This is the lowest framerate with which all timestamps can be
|
|
|
739 * represented accurately (it is the least common multiple of all
|
|
|
740 * framerates in the stream). Note, this value is just a guess!
|
|
|
741 * For example, if the time base is 1/90000 and all frames have either
|
|
|
742 * approximately 3600 or 1800 timer ticks, then r_frame_rate will be 50/1.
|
|
|
743 *
|
|
|
744 * Code outside avformat should access this field using:
|
|
|
745 * av_stream_get/set_r_frame_rate(stream)
|
|
|
746 */
|
|
|
747 AVRational r_frame_rate;
|
|
|
748
|
|
|
749 /*****************************************************************
|
|
|
750 * All fields below this line are not part of the public API. They
|
|
|
751 * may not be used outside of libavformat and can be changed and
|
|
|
752 * removed at will.
|
|
|
753 * New public fields should be added right above.
|
|
|
754 *****************************************************************
|
|
|
755 */
|
|
|
756
|
|
|
757 /**
|
|
|
758 * Stream information used internally by av_find_stream_info()
|
|
|
759 */
|
|
|
760 #define MAX_STD_TIMEBASES (60*12+6)
|
|
|
761 struct {
|
|
|
762 int64_t last_dts;
|
|
|
763 int64_t duration_gcd;
|
|
|
764 int duration_count;
|
|
|
765 double (*duration_error)[2][MAX_STD_TIMEBASES];
|
|
|
766 int64_t codec_info_duration;
|
|
|
767 int64_t codec_info_duration_fields;
|
|
|
768 int found_decoder;
|
|
|
769
|
|
|
770 int64_t last_duration;
|
|
|
771
|
|
|
772 /**
|
|
|
773 * Those are used for average framerate estimation.
|
|
|
774 */
|
|
|
775 int64_t fps_first_dts;
|
|
|
776 int fps_first_dts_idx;
|
|
|
777 int64_t fps_last_dts;
|
|
|
778 int fps_last_dts_idx;
|
|
|
779
|
|
|
780 } *info;
|
|
|
781
|
|
|
782 int pts_wrap_bits; /**< number of bits in pts (used for wrapping control) */
|
|
|
783
|
|
|
784 // Timestamp generation support:
|
|
|
785 /**
|
|
|
786 * Timestamp corresponding to the last dts sync point.
|
|
|
787 *
|
|
|
788 * Initialized when AVCodecParserContext.dts_sync_point >= 0 and
|
|
|
789 * a DTS is received from the underlying container. Otherwise set to
|
|
|
790 * AV_NOPTS_VALUE by default.
|
|
|
791 */
|
|
|
792 int64_t reference_dts;
|
|
|
793 int64_t first_dts;
|
|
|
794 int64_t cur_dts;
|
|
|
795 int64_t last_IP_pts;
|
|
|
796 int last_IP_duration;
|
|
|
797
|
|
|
798 /**
|
|
|
799 * Number of packets to buffer for codec probing
|
|
|
800 */
|
|
|
801 #define MAX_PROBE_PACKETS 2500
|
|
|
802 int probe_packets;
|
|
|
803
|
|
|
804 /**
|
|
|
805 * Number of frames that have been demuxed during av_find_stream_info()
|
|
|
806 */
|
|
|
807 int codec_info_nb_frames;
|
|
|
808
|
|
|
809 /**
|
|
|
810 * Stream Identifier
|
|
|
811 * This is the MPEG-TS stream identifier +1
|
|
|
812 * 0 means unknown
|
|
|
813 */
|
|
|
814 int stream_identifier;
|
|
|
815
|
|
|
816 int64_t interleaver_chunk_size;
|
|
|
817 int64_t interleaver_chunk_duration;
|
|
|
818
|
|
|
819 /* av_read_frame() support */
|
|
|
820 enum AVStreamParseType need_parsing;
|
|
|
821 struct AVCodecParserContext *parser;
|
|
|
822
|
|
|
823 /**
|
|
|
824 * last packet in packet_buffer for this stream when muxing.
|
|
|
825 */
|
|
|
826 struct AVPacketList *last_in_packet_buffer;
|
|
|
827 AVProbeData probe_data;
|
|
|
828 #define MAX_REORDER_DELAY 16
|
|
|
829 int64_t pts_buffer[MAX_REORDER_DELAY+1];
|
|
|
830
|
|
|
831 AVIndexEntry *index_entries; /**< Only used if the format does not
|
|
|
832 support seeking natively. */
|
|
|
833 int nb_index_entries;
|
|
|
834 unsigned int index_entries_allocated_size;
|
|
|
835
|
|
|
836 /**
|
|
|
837 * stream probing state
|
|
|
838 * -1 -> probing finished
|
|
|
839 * 0 -> no probing requested
|
|
|
840 * rest -> perform probing with request_probe being the minimum score to accept.
|
|
|
841 * NOT PART OF PUBLIC API
|
|
|
842 */
|
|
|
843 int request_probe;
|
|
|
844 /**
|
|
|
845 * Indicates that everything up to the next keyframe
|
|
|
846 * should be discarded.
|
|
|
847 */
|
|
|
848 int skip_to_keyframe;
|
|
|
849
|
|
|
850 /**
|
|
|
851 * Number of samples to skip at the start of the frame decoded from the next packet.
|
|
|
852 */
|
|
|
853 int skip_samples;
|
|
|
854
|
|
|
855 /**
|
|
|
856 * Number of internally decoded frames, used internally in libavformat, do not access
|
|
|
857 * its lifetime differs from info which is why it is not in that structure.
|
|
|
858 */
|
|
|
859 int nb_decoded_frames;
|
|
|
860
|
|
|
861 /**
|
|
|
862 * Timestamp offset added to timestamps before muxing
|
|
|
863 * NOT PART OF PUBLIC API
|
|
|
864 */
|
|
|
865 int64_t mux_ts_offset;
|
|
|
866
|
|
|
867 /**
|
|
|
868 * Internal data to check for wrapping of the time stamp
|
|
|
869 */
|
|
|
870 int64_t pts_wrap_reference;
|
|
|
871
|
|
|
872 /**
|
|
|
873 * Options for behavior, when a wrap is detected.
|
|
|
874 *
|
|
|
875 * Defined by AV_PTS_WRAP_ values.
|
|
|
876 *
|
|
|
877 * If correction is enabled, there are two possibilities:
|
|
|
878 * If the first time stamp is near the wrap point, the wrap offset
|
|
|
879 * will be subtracted, which will create negative time stamps.
|
|
|
880 * Otherwise the offset will be added.
|
|
|
881 */
|
|
|
882 int pts_wrap_behavior;
|
|
|
883
|
|
|
884 } AVStream;
|
|
|
885
|
|
|
886 AVRational av_stream_get_r_frame_rate(const AVStream *s);
|
|
|
887 void av_stream_set_r_frame_rate(AVStream *s, AVRational r);
|
|
|
888
|
|
|
889 #define AV_PROGRAM_RUNNING 1
|
|
|
890
|
|
|
891 /**
|
|
|
892 * New fields can be added to the end with minor version bumps.
|
|
|
893 * Removal, reordering and changes to existing fields require a major
|
|
|
894 * version bump.
|
|
|
895 * sizeof(AVProgram) must not be used outside libav*.
|
|
|
896 */
|
|
|
897 typedef struct AVProgram {
|
|
|
898 int id;
|
|
|
899 int flags;
|
|
|
900 enum AVDiscard discard; ///< selects which program to discard and which to feed to the caller
|
|
|
901 unsigned int *stream_index;
|
|
|
902 unsigned int nb_stream_indexes;
|
|
|
903 AVDictionary *metadata;
|
|
|
904
|
|
|
905 int program_num;
|
|
|
906 int pmt_pid;
|
|
|
907 int pcr_pid;
|
|
|
908
|
|
|
909 /*****************************************************************
|
|
|
910 * All fields below this line are not part of the public API. They
|
|
|
911 * may not be used outside of libavformat and can be changed and
|
|
|
912 * removed at will.
|
|
|
913 * New public fields should be added right above.
|
|
|
914 *****************************************************************
|
|
|
915 */
|
|
|
916 int64_t start_time;
|
|
|
917 int64_t end_time;
|
|
|
918
|
|
|
919 int64_t pts_wrap_reference; ///< reference dts for wrap detection
|
|
|
920 int pts_wrap_behavior; ///< behavior on wrap detection
|
|
|
921 } AVProgram;
|
|
|
922
|
|
|
923 #define AVFMTCTX_NOHEADER 0x0001 /**< signal that no header is present
|
|
|
924 (streams are added dynamically) */
|
|
|
925
|
|
|
926 typedef struct AVChapter {
|
|
|
927 int id; ///< unique ID to identify the chapter
|
|
|
928 AVRational time_base; ///< time base in which the start/end timestamps are specified
|
|
|
929 int64_t start, end; ///< chapter start/end time in time_base units
|
|
|
930 AVDictionary *metadata;
|
|
|
931 } AVChapter;
|
|
|
932
|
|
|
933
|
|
|
934 /**
|
|
|
935 * The duration of a video can be estimated through various ways, and this enum can be used
|
|
|
936 * to know how the duration was estimated.
|
|
|
937 */
|
|
|
938 enum AVDurationEstimationMethod {
|
|
|
939 AVFMT_DURATION_FROM_PTS, ///< Duration accurately estimated from PTSes
|
|
|
940 AVFMT_DURATION_FROM_STREAM, ///< Duration estimated from a stream with a known duration
|
|
|
941 AVFMT_DURATION_FROM_BITRATE ///< Duration estimated from bitrate (less accurate)
|
|
|
942 };
|
|
|
943
|
|
|
944 /**
|
|
|
945 * Format I/O context.
|
|
|
946 * New fields can be added to the end with minor version bumps.
|
|
|
947 * Removal, reordering and changes to existing fields require a major
|
|
|
948 * version bump.
|
|
|
949 * sizeof(AVFormatContext) must not be used outside libav*, use
|
|
|
950 * avformat_alloc_context() to create an AVFormatContext.
|
|
|
951 */
|
|
|
952 typedef struct AVFormatContext {
|
|
|
953 /**
|
|
|
954 * A class for logging and AVOptions. Set by avformat_alloc_context().
|
|
|
955 * Exports (de)muxer private options if they exist.
|
|
|
956 */
|
|
|
957 const AVClass *av_class;
|
|
|
958
|
|
|
959 /**
|
|
|
960 * Can only be iformat or oformat, not both at the same time.
|
|
|
961 *
|
|
|
962 * decoding: set by avformat_open_input().
|
|
|
963 * encoding: set by the user.
|
|
|
964 */
|
|
|
965 struct AVInputFormat *iformat;
|
|
|
966 struct AVOutputFormat *oformat;
|
|
|
967
|
|
|
968 /**
|
|
|
969 * Format private data. This is an AVOptions-enabled struct
|
|
|
970 * if and only if iformat/oformat.priv_class is not NULL.
|
|
|
971 */
|
|
|
972 void *priv_data;
|
|
|
973
|
|
|
974 /**
|
|
|
975 * I/O context.
|
|
|
976 *
|
|
|
977 * decoding: either set by the user before avformat_open_input() (then
|
|
|
978 * the user must close it manually) or set by avformat_open_input().
|
|
|
979 * encoding: set by the user.
|
|
|
980 *
|
|
|
981 * Do NOT set this field if AVFMT_NOFILE flag is set in
|
|
|
982 * iformat/oformat.flags. In such a case, the (de)muxer will handle
|
|
|
983 * I/O in some other way and this field will be NULL.
|
|
|
984 */
|
|
|
985 AVIOContext *pb;
|
|
|
986
|
|
|
987 /* stream info */
|
|
|
988 int ctx_flags; /**< Format-specific flags, see AVFMTCTX_xx */
|
|
|
989
|
|
|
990 /**
|
|
|
991 * A list of all streams in the file. New streams are created with
|
|
|
992 * avformat_new_stream().
|
|
|
993 *
|
|
|
994 * decoding: streams are created by libavformat in avformat_open_input().
|
|
|
995 * If AVFMTCTX_NOHEADER is set in ctx_flags, then new streams may also
|
|
|
996 * appear in av_read_frame().
|
|
|
997 * encoding: streams are created by the user before avformat_write_header().
|
|
|
998 */
|
|
|
999 unsigned int nb_streams;
|
|
|
1000 AVStream **streams;
|
|
|
1001
|
|
|
1002 char filename[1024]; /**< input or output filename */
|
|
|
1003
|
|
|
1004 /**
|
|
|
1005 * Decoding: position of the first frame of the component, in
|
|
|
1006 * AV_TIME_BASE fractional seconds. NEVER set this value directly:
|
|
|
1007 * It is deduced from the AVStream values.
|
|
|
1008 */
|
|
|
1009 int64_t start_time;
|
|
|
1010
|
|
|
1011 /**
|
|
|
1012 * Decoding: duration of the stream, in AV_TIME_BASE fractional
|
|
|
1013 * seconds. Only set this value if you know none of the individual stream
|
|
|
1014 * durations and also do not set any of them. This is deduced from the
|
|
|
1015 * AVStream values if not set.
|
|
|
1016 */
|
|
|
1017 int64_t duration;
|
|
|
1018
|
|
|
1019 /**
|
|
|
1020 * Decoding: total stream bitrate in bit/s, 0 if not
|
|
|
1021 * available. Never set it directly if the file_size and the
|
|
|
1022 * duration are known as FFmpeg can compute it automatically.
|
|
|
1023 */
|
|
|
1024 int bit_rate;
|
|
|
1025
|
|
|
1026 unsigned int packet_size;
|
|
|
1027 int max_delay;
|
|
|
1028
|
|
|
1029 int flags;
|
|
|
1030 #define AVFMT_FLAG_GENPTS 0x0001 ///< Generate missing pts even if it requires parsing future frames.
|
|
|
1031 #define AVFMT_FLAG_IGNIDX 0x0002 ///< Ignore index.
|
|
|
1032 #define AVFMT_FLAG_NONBLOCK 0x0004 ///< Do not block when reading packets from input.
|
|
|
1033 #define AVFMT_FLAG_IGNDTS 0x0008 ///< Ignore DTS on frames that contain both DTS & PTS
|
|
|
1034 #define AVFMT_FLAG_NOFILLIN 0x0010 ///< Do not infer any values from other values, just return what is stored in the container
|
|
|
1035 #define AVFMT_FLAG_NOPARSE 0x0020 ///< Do not use AVParsers, you also must set AVFMT_FLAG_NOFILLIN as the fillin code works on frames and no parsing -> no frames. Also seeking to frames can not work if parsing to find frame boundaries has been disabled
|
|
|
1036 #define AVFMT_FLAG_NOBUFFER 0x0040 ///< Do not buffer frames when possible
|
|
|
1037 #define AVFMT_FLAG_CUSTOM_IO 0x0080 ///< The caller has supplied a custom AVIOContext, don't avio_close() it.
|
|
|
1038 #define AVFMT_FLAG_DISCARD_CORRUPT 0x0100 ///< Discard frames marked corrupted
|
|
|
1039 #define AVFMT_FLAG_MP4A_LATM 0x8000 ///< Enable RTP MP4A-LATM payload
|
|
|
1040 #define AVFMT_FLAG_SORT_DTS 0x10000 ///< try to interleave outputted packets by dts (using this flag can slow demuxing down)
|
|
|
1041 #define AVFMT_FLAG_PRIV_OPT 0x20000 ///< Enable use of private options by delaying codec open (this could be made default once all code is converted)
|
|
|
1042 #define AVFMT_FLAG_KEEP_SIDE_DATA 0x40000 ///< Don't merge side data but keep it separate.
|
|
|
1043
|
|
|
1044 /**
|
|
|
1045 * decoding: size of data to probe; encoding: unused.
|
|
|
1046 */
|
|
|
1047 unsigned int probesize;
|
|
|
1048
|
|
|
1049 /**
|
|
|
1050 * decoding: maximum time (in AV_TIME_BASE units) during which the input should
|
|
|
1051 * be analyzed in avformat_find_stream_info().
|
|
|
1052 */
|
|
|
1053 int max_analyze_duration;
|
|
|
1054
|
|
|
1055 const uint8_t *key;
|
|
|
1056 int keylen;
|
|
|
1057
|
|
|
1058 unsigned int nb_programs;
|
|
|
1059 AVProgram **programs;
|
|
|
1060
|
|
|
1061 /**
|
|
|
1062 * Forced video codec_id.
|
|
|
1063 * Demuxing: Set by user.
|
|
|
1064 */
|
|
|
1065 enum AVCodecID video_codec_id;
|
|
|
1066
|
|
|
1067 /**
|
|
|
1068 * Forced audio codec_id.
|
|
|
1069 * Demuxing: Set by user.
|
|
|
1070 */
|
|
|
1071 enum AVCodecID audio_codec_id;
|
|
|
1072
|
|
|
1073 /**
|
|
|
1074 * Forced subtitle codec_id.
|
|
|
1075 * Demuxing: Set by user.
|
|
|
1076 */
|
|
|
1077 enum AVCodecID subtitle_codec_id;
|
|
|
1078
|
|
|
1079 /**
|
|
|
1080 * Maximum amount of memory in bytes to use for the index of each stream.
|
|
|
1081 * If the index exceeds this size, entries will be discarded as
|
|
|
1082 * needed to maintain a smaller size. This can lead to slower or less
|
|
|
1083 * accurate seeking (depends on demuxer).
|
|
|
1084 * Demuxers for which a full in-memory index is mandatory will ignore
|
|
|
1085 * this.
|
|
|
1086 * muxing : unused
|
|
|
1087 * demuxing: set by user
|
|
|
1088 */
|
|
|
1089 unsigned int max_index_size;
|
|
|
1090
|
|
|
1091 /**
|
|
|
1092 * Maximum amount of memory in bytes to use for buffering frames
|
|
|
1093 * obtained from realtime capture devices.
|
|
|
1094 */
|
|
|
1095 unsigned int max_picture_buffer;
|
|
|
1096
|
|
|
1097 unsigned int nb_chapters;
|
|
|
1098 AVChapter **chapters;
|
|
|
1099
|
|
|
1100 AVDictionary *metadata;
|
|
|
1101
|
|
|
1102 /**
|
|
|
1103 * Start time of the stream in real world time, in microseconds
|
|
|
1104 * since the unix epoch (00:00 1st January 1970). That is, pts=0
|
|
|
1105 * in the stream was captured at this real world time.
|
|
|
1106 * - encoding: Set by user.
|
|
|
1107 * - decoding: Unused.
|
|
|
1108 */
|
|
|
1109 int64_t start_time_realtime;
|
|
|
1110
|
|
|
1111 /**
|
|
|
1112 * decoding: number of frames used to probe fps
|
|
|
1113 */
|
|
|
1114 int fps_probe_size;
|
|
|
1115
|
|
|
1116 /**
|
|
|
1117 * Error recognition; higher values will detect more errors but may
|
|
|
1118 * misdetect some more or less valid parts as errors.
|
|
|
1119 * - encoding: unused
|
|
|
1120 * - decoding: Set by user.
|
|
|
1121 */
|
|
|
1122 int error_recognition;
|
|
|
1123
|
|
|
1124 /**
|
|
|
1125 * Custom interrupt callbacks for the I/O layer.
|
|
|
1126 *
|
|
|
1127 * decoding: set by the user before avformat_open_input().
|
|
|
1128 * encoding: set by the user before avformat_write_header()
|
|
|
1129 * (mainly useful for AVFMT_NOFILE formats). The callback
|
|
|
1130 * should also be passed to avio_open2() if it's used to
|
|
|
1131 * open the file.
|
|
|
1132 */
|
|
|
1133 AVIOInterruptCB interrupt_callback;
|
|
|
1134
|
|
|
1135 /**
|
|
|
1136 * Flags to enable debugging.
|
|
|
1137 */
|
|
|
1138 int debug;
|
|
|
1139 #define FF_FDEBUG_TS 0x0001
|
|
|
1140
|
|
|
1141 /**
|
|
|
1142 * Transport stream id.
|
|
|
1143 * This will be moved into demuxer private options. Thus no API/ABI compatibility
|
|
|
1144 */
|
|
|
1145 int ts_id;
|
|
|
1146
|
|
|
1147 /**
|
|
|
1148 * Audio preload in microseconds.
|
|
|
1149 * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
|
1150 * - encoding: Set by user via AVOptions (NO direct access)
|
|
|
1151 * - decoding: unused
|
|
|
1152 */
|
|
|
1153 int audio_preload;
|
|
|
1154
|
|
|
1155 /**
|
|
|
1156 * Max chunk time in microseconds.
|
|
|
1157 * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
|
1158 * - encoding: Set by user via AVOptions (NO direct access)
|
|
|
1159 * - decoding: unused
|
|
|
1160 */
|
|
|
1161 int max_chunk_duration;
|
|
|
1162
|
|
|
1163 /**
|
|
|
1164 * Max chunk size in bytes
|
|
|
1165 * Note, not all formats support this and unpredictable things may happen if it is used when not supported.
|
|
|
1166 * - encoding: Set by user via AVOptions (NO direct access)
|
|
|
1167 * - decoding: unused
|
|
|
1168 */
|
|
|
1169 int max_chunk_size;
|
|
|
1170
|
|
|
1171 /**
|
|
|
1172 * forces the use of wallclock timestamps as pts/dts of packets
|
|
|
1173 * This has undefined results in the presence of B frames.
|
|
|
1174 * - encoding: unused
|
|
|
1175 * - decoding: Set by user via AVOptions (NO direct access)
|
|
|
1176 */
|
|
|
1177 int use_wallclock_as_timestamps;
|
|
|
1178
|
|
|
1179 /**
|
|
|
1180 * Avoid negative timestamps during muxing.
|
|
|
1181 * 0 -> allow negative timestamps
|
|
|
1182 * 1 -> avoid negative timestamps
|
|
|
1183 * -1 -> choose automatically (default)
|
|
|
1184 * Note, this only works when interleave_packet_per_dts is in use.
|
|
|
1185 * - encoding: Set by user via AVOptions (NO direct access)
|
|
|
1186 * - decoding: unused
|
|
|
1187 */
|
|
|
1188 int avoid_negative_ts;
|
|
|
1189
|
|
|
1190 /**
|
|
|
1191 * avio flags, used to force AVIO_FLAG_DIRECT.
|
|
|
1192 * - encoding: unused
|
|
|
1193 * - decoding: Set by user via AVOptions (NO direct access)
|
|
|
1194 */
|
|
|
1195 int avio_flags;
|
|
|
1196
|
|
|
1197 /**
|
|
|
1198 * The duration field can be estimated through various ways, and this field can be used
|
|
|
1199 * to know how the duration was estimated.
|
|
|
1200 * - encoding: unused
|
|
|
1201 * - decoding: Read by user via AVOptions (NO direct access)
|
|
|
1202 */
|
|
|
1203 enum AVDurationEstimationMethod duration_estimation_method;
|
|
|
1204
|
|
|
1205 /**
|
|
|
1206 * Skip initial bytes when opening stream
|
|
|
1207 * - encoding: unused
|
|
|
1208 * - decoding: Set by user via AVOptions (NO direct access)
|
|
|
1209 */
|
|
|
1210 unsigned int skip_initial_bytes;
|
|
|
1211
|
|
|
1212 /**
|
|
|
1213 * Correct single timestamp overflows
|
|
|
1214 * - encoding: unused
|
|
|
1215 * - decoding: Set by user via AVOPtions (NO direct access)
|
|
|
1216 */
|
|
|
1217 unsigned int correct_ts_overflow;
|
|
|
1218
|
|
|
1219 /**
|
|
|
1220 * Force seeking to any (also non key) frames.
|
|
|
1221 * - encoding: unused
|
|
|
1222 * - decoding: Set by user via AVOPtions (NO direct access)
|
|
|
1223 */
|
|
|
1224 int seek2any;
|
|
|
1225
|
|
|
1226 /**
|
|
|
1227 * Flush the I/O context after each packet.
|
|
|
1228 * - encoding: Set by user via AVOptions (NO direct access)
|
|
|
1229 * - decoding: unused
|
|
|
1230 */
|
|
|
1231 int flush_packets;
|
|
|
1232
|
|
|
1233 /*****************************************************************
|
|
|
1234 * All fields below this line are not part of the public API. They
|
|
|
1235 * may not be used outside of libavformat and can be changed and
|
|
|
1236 * removed at will.
|
|
|
1237 * New public fields should be added right above.
|
|
|
1238 *****************************************************************
|
|
|
1239 */
|
|
|
1240
|
|
|
1241 /**
|
|
|
1242 * This buffer is only needed when packets were already buffered but
|
|
|
1243 * not decoded, for example to get the codec parameters in MPEG
|
|
|
1244 * streams.
|
|
|
1245 */
|
|
|
1246 struct AVPacketList *packet_buffer;
|
|
|
1247 struct AVPacketList *packet_buffer_end;
|
|
|
1248
|
|
|
1249 /* av_seek_frame() support */
|
|
|
1250 int64_t data_offset; /**< offset of the first packet */
|
|
|
1251
|
|
|
1252 /**
|
|
|
1253 * Raw packets from the demuxer, prior to parsing and decoding.
|
|
|
1254 * This buffer is used for buffering packets until the codec can
|
|
|
1255 * be identified, as parsing cannot be done without knowing the
|
|
|
1256 * codec.
|
|
|
1257 */
|
|
|
1258 struct AVPacketList *raw_packet_buffer;
|
|
|
1259 struct AVPacketList *raw_packet_buffer_end;
|
|
|
1260 /**
|
|
|
1261 * Packets split by the parser get queued here.
|
|
|
1262 */
|
|
|
1263 struct AVPacketList *parse_queue;
|
|
|
1264 struct AVPacketList *parse_queue_end;
|
|
|
1265 /**
|
|
|
1266 * Remaining size available for raw_packet_buffer, in bytes.
|
|
|
1267 */
|
|
|
1268 #define RAW_PACKET_BUFFER_SIZE 2500000
|
|
|
1269 int raw_packet_buffer_remaining_size;
|
|
|
1270
|
|
|
1271 /**
|
|
|
1272 * Offset to remap timestamps to be non-negative.
|
|
|
1273 * Expressed in timebase units.
|
|
|
1274 * @see AVStream.mux_ts_offset
|
|
|
1275 */
|
|
|
1276 int64_t offset;
|
|
|
1277
|
|
|
1278 /**
|
|
|
1279 * Timebase for the timestamp offset.
|
|
|
1280 */
|
|
|
1281 AVRational offset_timebase;
|
|
|
1282
|
|
|
1283 /**
|
|
|
1284 * IO repositioned flag.
|
|
|
1285 * This is set by avformat when the underlaying IO context read pointer
|
|
|
1286 * is repositioned, for example when doing byte based seeking.
|
|
|
1287 * Demuxers can use the flag to detect such changes.
|
|
|
1288 */
|
|
|
1289 int io_repositioned;
|
|
|
1290 } AVFormatContext;
|
|
|
1291
|
|
|
1292 /**
|
|
|
1293 * Returns the method used to set ctx->duration.
|
|
|
1294 *
|
|
|
1295 * @return AVFMT_DURATION_FROM_PTS, AVFMT_DURATION_FROM_STREAM, or AVFMT_DURATION_FROM_BITRATE.
|
|
|
1296 */
|
|
|
1297 enum AVDurationEstimationMethod av_fmt_ctx_get_duration_estimation_method(const AVFormatContext* ctx);
|
|
|
1298
|
|
|
1299 typedef struct AVPacketList {
|
|
|
1300 AVPacket pkt;
|
|
|
1301 struct AVPacketList *next;
|
|
|
1302 } AVPacketList;
|
|
|
1303
|
|
|
1304
|
|
|
1305 /**
|
|
|
1306 * @defgroup lavf_core Core functions
|
|
|
1307 * @ingroup libavf
|
|
|
1308 *
|
|
|
1309 * Functions for querying libavformat capabilities, allocating core structures,
|
|
|
1310 * etc.
|
|
|
1311 * @{
|
|
|
1312 */
|
|
|
1313
|
|
|
1314 /**
|
|
|
1315 * Return the LIBAVFORMAT_VERSION_INT constant.
|
|
|
1316 */
|
|
|
1317 unsigned avformat_version(void);
|
|
|
1318
|
|
|
1319 /**
|
|
|
1320 * Return the libavformat build-time configuration.
|
|
|
1321 */
|
|
|
1322 const char *avformat_configuration(void);
|
|
|
1323
|
|
|
1324 /**
|
|
|
1325 * Return the libavformat license.
|
|
|
1326 */
|
|
|
1327 const char *avformat_license(void);
|
|
|
1328
|
|
|
1329 /**
|
|
|
1330 * Initialize libavformat and register all the muxers, demuxers and
|
|
|
1331 * protocols. If you do not call this function, then you can select
|
|
|
1332 * exactly which formats you want to support.
|
|
|
1333 *
|
|
|
1334 * @see av_register_input_format()
|
|
|
1335 * @see av_register_output_format()
|
|
|
1336 */
|
|
|
1337 void av_register_all(void);
|
|
|
1338
|
|
|
1339 void av_register_input_format(AVInputFormat *format);
|
|
|
1340 void av_register_output_format(AVOutputFormat *format);
|
|
|
1341
|
|
|
1342 /**
|
|
|
1343 * Do global initialization of network components. This is optional,
|
|
|
1344 * but recommended, since it avoids the overhead of implicitly
|
|
|
1345 * doing the setup for each session.
|
|
|
1346 *
|
|
|
1347 * Calling this function will become mandatory if using network
|
|
|
1348 * protocols at some major version bump.
|
|
|
1349 */
|
|
|
1350 int avformat_network_init(void);
|
|
|
1351
|
|
|
1352 /**
|
|
|
1353 * Undo the initialization done by avformat_network_init.
|
|
|
1354 */
|
|
|
1355 int avformat_network_deinit(void);
|
|
|
1356
|
|
|
1357 /**
|
|
|
1358 * If f is NULL, returns the first registered input format,
|
|
|
1359 * if f is non-NULL, returns the next registered input format after f
|
|
|
1360 * or NULL if f is the last one.
|
|
|
1361 */
|
|
|
1362 AVInputFormat *av_iformat_next(AVInputFormat *f);
|
|
|
1363
|
|
|
1364 /**
|
|
|
1365 * If f is NULL, returns the first registered output format,
|
|
|
1366 * if f is non-NULL, returns the next registered output format after f
|
|
|
1367 * or NULL if f is the last one.
|
|
|
1368 */
|
|
|
1369 AVOutputFormat *av_oformat_next(AVOutputFormat *f);
|
|
|
1370
|
|
|
1371 /**
|
|
|
1372 * Allocate an AVFormatContext.
|
|
|
1373 * avformat_free_context() can be used to free the context and everything
|
|
|
1374 * allocated by the framework within it.
|
|
|
1375 */
|
|
|
1376 AVFormatContext *avformat_alloc_context(void);
|
|
|
1377
|
|
|
1378 /**
|
|
|
1379 * Free an AVFormatContext and all its streams.
|
|
|
1380 * @param s context to free
|
|
|
1381 */
|
|
|
1382 void avformat_free_context(AVFormatContext *s);
|
|
|
1383
|
|
|
1384 /**
|
|
|
1385 * Get the AVClass for AVFormatContext. It can be used in combination with
|
|
|
1386 * AV_OPT_SEARCH_FAKE_OBJ for examining options.
|
|
|
1387 *
|
|
|
1388 * @see av_opt_find().
|
|
|
1389 */
|
|
|
1390 const AVClass *avformat_get_class(void);
|
|
|
1391
|
|
|
1392 /**
|
|
|
1393 * Add a new stream to a media file.
|
|
|
1394 *
|
|
|
1395 * When demuxing, it is called by the demuxer in read_header(). If the
|
|
|
1396 * flag AVFMTCTX_NOHEADER is set in s.ctx_flags, then it may also
|
|
|
1397 * be called in read_packet().
|
|
|
1398 *
|
|
|
1399 * When muxing, should be called by the user before avformat_write_header().
|
|
|
1400 *
|
|
|
1401 * @param c If non-NULL, the AVCodecContext corresponding to the new stream
|
|
|
1402 * will be initialized to use this codec. This is needed for e.g. codec-specific
|
|
|
1403 * defaults to be set, so codec should be provided if it is known.
|
|
|
1404 *
|
|
|
1405 * @return newly created stream or NULL on error.
|
|
|
1406 */
|
|
|
1407 AVStream *avformat_new_stream(AVFormatContext *s, const AVCodec *c);
|
|
|
1408
|
|
|
1409 AVProgram *av_new_program(AVFormatContext *s, int id);
|
|
|
1410
|
|
|
1411 /**
|
|
|
1412 * @}
|
|
|
1413 */
|
|
|
1414
|
|
|
1415
|
|
|
1416 #if FF_API_PKT_DUMP
|
|
|
1417 attribute_deprecated void av_pkt_dump(FILE *f, AVPacket *pkt, int dump_payload);
|
|
|
1418 attribute_deprecated void av_pkt_dump_log(void *avcl, int level, AVPacket *pkt,
|
|
|
1419 int dump_payload);
|
|
|
1420 #endif
|
|
|
1421
|
|
|
1422 #if FF_API_ALLOC_OUTPUT_CONTEXT
|
|
|
1423 /**
|
|
|
1424 * @deprecated deprecated in favor of avformat_alloc_output_context2()
|
|
|
1425 */
|
|
|
1426 attribute_deprecated
|
|
|
1427 AVFormatContext *avformat_alloc_output_context(const char *format,
|
|
|
1428 AVOutputFormat *oformat,
|
|
|
1429 const char *filename);
|
|
|
1430 #endif
|
|
|
1431
|
|
|
1432 /**
|
|
|
1433 * Allocate an AVFormatContext for an output format.
|
|
|
1434 * avformat_free_context() can be used to free the context and
|
|
|
1435 * everything allocated by the framework within it.
|
|
|
1436 *
|
|
|
1437 * @param *ctx is set to the created format context, or to NULL in
|
|
|
1438 * case of failure
|
|
|
1439 * @param oformat format to use for allocating the context, if NULL
|
|
|
1440 * format_name and filename are used instead
|
|
|
1441 * @param format_name the name of output format to use for allocating the
|
|
|
1442 * context, if NULL filename is used instead
|
|
|
1443 * @param filename the name of the filename to use for allocating the
|
|
|
1444 * context, may be NULL
|
|
|
1445 * @return >= 0 in case of success, a negative AVERROR code in case of
|
|
|
1446 * failure
|
|
|
1447 */
|
|
|
1448 int avformat_alloc_output_context2(AVFormatContext **ctx, AVOutputFormat *oformat,
|
|
|
1449 const char *format_name, const char *filename);
|
|
|
1450
|
|
|
1451 /**
|
|
|
1452 * @addtogroup lavf_decoding
|
|
|
1453 * @{
|
|
|
1454 */
|
|
|
1455
|
|
|
1456 /**
|
|
|
1457 * Find AVInputFormat based on the short name of the input format.
|
|
|
1458 */
|
|
|
1459 AVInputFormat *av_find_input_format(const char *short_name);
|
|
|
1460
|
|
|
1461 /**
|
|
|
1462 * Guess the file format.
|
|
|
1463 *
|
|
|
1464 * @param is_opened Whether the file is already opened; determines whether
|
|
|
1465 * demuxers with or without AVFMT_NOFILE are probed.
|
|
|
1466 */
|
|
|
1467 AVInputFormat *av_probe_input_format(AVProbeData *pd, int is_opened);
|
|
|
1468
|
|
|
1469 /**
|
|
|
1470 * Guess the file format.
|
|
|
1471 *
|
|
|
1472 * @param is_opened Whether the file is already opened; determines whether
|
|
|
1473 * demuxers with or without AVFMT_NOFILE are probed.
|
|
|
1474 * @param score_max A probe score larger that this is required to accept a
|
|
|
1475 * detection, the variable is set to the actual detection
|
|
|
1476 * score afterwards.
|
|
|
1477 * If the score is <= AVPROBE_SCORE_MAX / 4 it is recommended
|
|
|
1478 * to retry with a larger probe buffer.
|
|
|
1479 */
|
|
|
1480 AVInputFormat *av_probe_input_format2(AVProbeData *pd, int is_opened, int *score_max);
|
|
|
1481
|
|
|
1482 /**
|
|
|
1483 * Guess the file format.
|
|
|
1484 *
|
|
|
1485 * @param is_opened Whether the file is already opened; determines whether
|
|
|
1486 * demuxers with or without AVFMT_NOFILE are probed.
|
|
|
1487 * @param score_ret The score of the best detection.
|
|
|
1488 */
|
|
|
1489 AVInputFormat *av_probe_input_format3(AVProbeData *pd, int is_opened, int *score_ret);
|
|
|
1490
|
|
|
1491 /**
|
|
|
1492 * Probe a bytestream to determine the input format. Each time a probe returns
|
|
|
1493 * with a score that is too low, the probe buffer size is increased and another
|
|
|
1494 * attempt is made. When the maximum probe size is reached, the input format
|
|
|
1495 * with the highest score is returned.
|
|
|
1496 *
|
|
|
1497 * @param pb the bytestream to probe
|
|
|
1498 * @param fmt the input format is put here
|
|
|
1499 * @param filename the filename of the stream
|
|
|
1500 * @param logctx the log context
|
|
|
1501 * @param offset the offset within the bytestream to probe from
|
|
|
1502 * @param max_probe_size the maximum probe buffer size (zero for default)
|
|
|
1503 * @return 0 in case of success, a negative value corresponding to an
|
|
|
1504 * AVERROR code otherwise
|
|
|
1505 */
|
|
|
1506 int av_probe_input_buffer(AVIOContext *pb, AVInputFormat **fmt,
|
|
|
1507 const char *filename, void *logctx,
|
|
|
1508 unsigned int offset, unsigned int max_probe_size);
|
|
|
1509
|
|
|
1510 /**
|
|
|
1511 * Open an input stream and read the header. The codecs are not opened.
|
|
|
1512 * The stream must be closed with av_close_input_file().
|
|
|
1513 *
|
|
|
1514 * @param ps Pointer to user-supplied AVFormatContext (allocated by avformat_alloc_context).
|
|
|
1515 * May be a pointer to NULL, in which case an AVFormatContext is allocated by this
|
|
|
1516 * function and written into ps.
|
|
|
1517 * Note that a user-supplied AVFormatContext will be freed on failure.
|
|
|
1518 * @param filename Name of the stream to open.
|
|
|
1519 * @param fmt If non-NULL, this parameter forces a specific input format.
|
|
|
1520 * Otherwise the format is autodetected.
|
|
|
1521 * @param options A dictionary filled with AVFormatContext and demuxer-private options.
|
|
|
1522 * On return this parameter will be destroyed and replaced with a dict containing
|
|
|
1523 * options that were not found. May be NULL.
|
|
|
1524 *
|
|
|
1525 * @return 0 on success, a negative AVERROR on failure.
|
|
|
1526 *
|
|
|
1527 * @note If you want to use custom IO, preallocate the format context and set its pb field.
|
|
|
1528 */
|
|
|
1529 int avformat_open_input(AVFormatContext **ps, const char *filename, AVInputFormat *fmt, AVDictionary **options);
|
|
|
1530
|
|
|
1531 attribute_deprecated
|
|
|
1532 int av_demuxer_open(AVFormatContext *ic);
|
|
|
1533
|
|
|
1534 #if FF_API_FORMAT_PARAMETERS
|
|
|
1535 /**
|
|
|
1536 * Read packets of a media file to get stream information. This
|
|
|
1537 * is useful for file formats with no headers such as MPEG. This
|
|
|
1538 * function also computes the real framerate in case of MPEG-2 repeat
|
|
|
1539 * frame mode.
|
|
|
1540 * The logical file position is not changed by this function;
|
|
|
1541 * examined packets may be buffered for later processing.
|
|
|
1542 *
|
|
|
1543 * @param ic media file handle
|
|
|
1544 * @return >=0 if OK, AVERROR_xxx on error
|
|
|
1545 * @todo Let the user decide somehow what information is needed so that
|
|
|
1546 * we do not waste time getting stuff the user does not need.
|
|
|
1547 *
|
|
|
1548 * @deprecated use avformat_find_stream_info.
|
|
|
1549 */
|
|
|
1550 attribute_deprecated
|
|
|
1551 int av_find_stream_info(AVFormatContext *ic);
|
|
|
1552 #endif
|
|
|
1553
|
|
|
1554 /**
|
|
|
1555 * Read packets of a media file to get stream information. This
|
|
|
1556 * is useful for file formats with no headers such as MPEG. This
|
|
|
1557 * function also computes the real framerate in case of MPEG-2 repeat
|
|
|
1558 * frame mode.
|
|
|
1559 * The logical file position is not changed by this function;
|
|
|
1560 * examined packets may be buffered for later processing.
|
|
|
1561 *
|
|
|
1562 * @param ic media file handle
|
|
|
1563 * @param options If non-NULL, an ic.nb_streams long array of pointers to
|
|
|
1564 * dictionaries, where i-th member contains options for
|
|
|
1565 * codec corresponding to i-th stream.
|
|
|
1566 * On return each dictionary will be filled with options that were not found.
|
|
|
1567 * @return >=0 if OK, AVERROR_xxx on error
|
|
|
1568 *
|
|
|
1569 * @note this function isn't guaranteed to open all the codecs, so
|
|
|
1570 * options being non-empty at return is a perfectly normal behavior.
|
|
|
1571 *
|
|
|
1572 * @todo Let the user decide somehow what information is needed so that
|
|
|
1573 * we do not waste time getting stuff the user does not need.
|
|
|
1574 */
|
|
|
1575 int avformat_find_stream_info(AVFormatContext *ic, AVDictionary **options);
|
|
|
1576
|
|
|
1577 /**
|
|
|
1578 * Find the programs which belong to a given stream.
|
|
|
1579 *
|
|
|
1580 * @param ic media file handle
|
|
|
1581 * @param last the last found program, the search will start after this
|
|
|
1582 * program, or from the beginning if it is NULL
|
|
|
1583 * @param s stream index
|
|
|
1584 * @return the next program which belongs to s, NULL if no program is found or
|
|
|
1585 * the last program is not among the programs of ic.
|
|
|
1586 */
|
|
|
1587 AVProgram *av_find_program_from_stream(AVFormatContext *ic, AVProgram *last, int s);
|
|
|
1588
|
|
|
1589 /**
|
|
|
1590 * Find the "best" stream in the file.
|
|
|
1591 * The best stream is determined according to various heuristics as the most
|
|
|
1592 * likely to be what the user expects.
|
|
|
1593 * If the decoder parameter is non-NULL, av_find_best_stream will find the
|
|
|
1594 * default decoder for the stream's codec; streams for which no decoder can
|
|
|
1595 * be found are ignored.
|
|
|
1596 *
|
|
|
1597 * @param ic media file handle
|
|
|
1598 * @param type stream type: video, audio, subtitles, etc.
|
|
|
1599 * @param wanted_stream_nb user-requested stream number,
|
|
|
1600 * or -1 for automatic selection
|
|
|
1601 * @param related_stream try to find a stream related (eg. in the same
|
|
|
1602 * program) to this one, or -1 if none
|
|
|
1603 * @param decoder_ret if non-NULL, returns the decoder for the
|
|
|
1604 * selected stream
|
|
|
1605 * @param flags flags; none are currently defined
|
|
|
1606 * @return the non-negative stream number in case of success,
|
|
|
1607 * AVERROR_STREAM_NOT_FOUND if no stream with the requested type
|
|
|
1608 * could be found,
|
|
|
1609 * AVERROR_DECODER_NOT_FOUND if streams were found but no decoder
|
|
|
1610 * @note If av_find_best_stream returns successfully and decoder_ret is not
|
|
|
1611 * NULL, then *decoder_ret is guaranteed to be set to a valid AVCodec.
|
|
|
1612 */
|
|
|
1613 int av_find_best_stream(AVFormatContext *ic,
|
|
|
1614 enum AVMediaType type,
|
|
|
1615 int wanted_stream_nb,
|
|
|
1616 int related_stream,
|
|
|
1617 AVCodec **decoder_ret,
|
|
|
1618 int flags);
|
|
|
1619
|
|
|
1620 #if FF_API_READ_PACKET
|
|
|
1621 /**
|
|
|
1622 * @deprecated use AVFMT_FLAG_NOFILLIN | AVFMT_FLAG_NOPARSE to read raw
|
|
|
1623 * unprocessed packets
|
|
|
1624 *
|
|
|
1625 * Read a transport packet from a media file.
|
|
|
1626 *
|
|
|
1627 * This function is obsolete and should never be used.
|
|
|
1628 * Use av_read_frame() instead.
|
|
|
1629 *
|
|
|
1630 * @param s media file handle
|
|
|
1631 * @param pkt is filled
|
|
|
1632 * @return 0 if OK, AVERROR_xxx on error
|
|
|
1633 */
|
|
|
1634 attribute_deprecated
|
|
|
1635 int av_read_packet(AVFormatContext *s, AVPacket *pkt);
|
|
|
1636 #endif
|
|
|
1637
|
|
|
1638 /**
|
|
|
1639 * Return the next frame of a stream.
|
|
|
1640 * This function returns what is stored in the file, and does not validate
|
|
|
1641 * that what is there are valid frames for the decoder. It will split what is
|
|
|
1642 * stored in the file into frames and return one for each call. It will not
|
|
|
1643 * omit invalid data between valid frames so as to give the decoder the maximum
|
|
|
1644 * information possible for decoding.
|
|
|
1645 *
|
|
|
1646 * If pkt->buf is NULL, then the packet is valid until the next
|
|
|
1647 * av_read_frame() or until av_close_input_file(). Otherwise the packet is valid
|
|
|
1648 * indefinitely. In both cases the packet must be freed with
|
|
|
1649 * av_free_packet when it is no longer needed. For video, the packet contains
|
|
|
1650 * exactly one frame. For audio, it contains an integer number of frames if each
|
|
|
1651 * frame has a known fixed size (e.g. PCM or ADPCM data). If the audio frames
|
|
|
1652 * have a variable size (e.g. MPEG audio), then it contains one frame.
|
|
|
1653 *
|
|
|
1654 * pkt->pts, pkt->dts and pkt->duration are always set to correct
|
|
|
1655 * values in AVStream.time_base units (and guessed if the format cannot
|
|
|
1656 * provide them). pkt->pts can be AV_NOPTS_VALUE if the video format
|
|
|
1657 * has B-frames, so it is better to rely on pkt->dts if you do not
|
|
|
1658 * decompress the payload.
|
|
|
1659 *
|
|
|
1660 * @return 0 if OK, < 0 on error or end of file
|
|
|
1661 */
|
|
|
1662 int av_read_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
1663
|
|
|
1664 /**
|
|
|
1665 * Seek to the keyframe at timestamp.
|
|
|
1666 * 'timestamp' in 'stream_index'.
|
|
|
1667 * @param stream_index If stream_index is (-1), a default
|
|
|
1668 * stream is selected, and timestamp is automatically converted
|
|
|
1669 * from AV_TIME_BASE units to the stream specific time_base.
|
|
|
1670 * @param timestamp Timestamp in AVStream.time_base units
|
|
|
1671 * or, if no stream is specified, in AV_TIME_BASE units.
|
|
|
1672 * @param flags flags which select direction and seeking mode
|
|
|
1673 * @return >= 0 on success
|
|
|
1674 */
|
|
|
1675 int av_seek_frame(AVFormatContext *s, int stream_index, int64_t timestamp,
|
|
|
1676 int flags);
|
|
|
1677
|
|
|
1678 /**
|
|
|
1679 * Seek to timestamp ts.
|
|
|
1680 * Seeking will be done so that the point from which all active streams
|
|
|
1681 * can be presented successfully will be closest to ts and within min/max_ts.
|
|
|
1682 * Active streams are all streams that have AVStream.discard < AVDISCARD_ALL.
|
|
|
1683 *
|
|
|
1684 * If flags contain AVSEEK_FLAG_BYTE, then all timestamps are in bytes and
|
|
|
1685 * are the file position (this may not be supported by all demuxers).
|
|
|
1686 * If flags contain AVSEEK_FLAG_FRAME, then all timestamps are in frames
|
|
|
1687 * in the stream with stream_index (this may not be supported by all demuxers).
|
|
|
1688 * Otherwise all timestamps are in units of the stream selected by stream_index
|
|
|
1689 * or if stream_index is -1, in AV_TIME_BASE units.
|
|
|
1690 * If flags contain AVSEEK_FLAG_ANY, then non-keyframes are treated as
|
|
|
1691 * keyframes (this may not be supported by all demuxers).
|
|
|
1692 * If flags contain AVSEEK_FLAG_BACKWARD, it is ignored.
|
|
|
1693 *
|
|
|
1694 * @param stream_index index of the stream which is used as time base reference
|
|
|
1695 * @param min_ts smallest acceptable timestamp
|
|
|
1696 * @param ts target timestamp
|
|
|
1697 * @param max_ts largest acceptable timestamp
|
|
|
1698 * @param flags flags
|
|
|
1699 * @return >=0 on success, error code otherwise
|
|
|
1700 *
|
|
|
1701 * @note This is part of the new seek API which is still under construction.
|
|
|
1702 * Thus do not use this yet. It may change at any time, do not expect
|
|
|
1703 * ABI compatibility yet!
|
|
|
1704 */
|
|
|
1705 int avformat_seek_file(AVFormatContext *s, int stream_index, int64_t min_ts, int64_t ts, int64_t max_ts, int flags);
|
|
|
1706
|
|
|
1707 /**
|
|
|
1708 * Start playing a network-based stream (e.g. RTSP stream) at the
|
|
|
1709 * current position.
|
|
|
1710 */
|
|
|
1711 int av_read_play(AVFormatContext *s);
|
|
|
1712
|
|
|
1713 /**
|
|
|
1714 * Pause a network-based stream (e.g. RTSP stream).
|
|
|
1715 *
|
|
|
1716 * Use av_read_play() to resume it.
|
|
|
1717 */
|
|
|
1718 int av_read_pause(AVFormatContext *s);
|
|
|
1719
|
|
|
1720 #if FF_API_CLOSE_INPUT_FILE
|
|
|
1721 /**
|
|
|
1722 * @deprecated use avformat_close_input()
|
|
|
1723 * Close a media file (but not its codecs).
|
|
|
1724 *
|
|
|
1725 * @param s media file handle
|
|
|
1726 */
|
|
|
1727 attribute_deprecated
|
|
|
1728 void av_close_input_file(AVFormatContext *s);
|
|
|
1729 #endif
|
|
|
1730
|
|
|
1731 /**
|
|
|
1732 * Close an opened input AVFormatContext. Free it and all its contents
|
|
|
1733 * and set *s to NULL.
|
|
|
1734 */
|
|
|
1735 void avformat_close_input(AVFormatContext **s);
|
|
|
1736 /**
|
|
|
1737 * @}
|
|
|
1738 */
|
|
|
1739
|
|
|
1740 #if FF_API_NEW_STREAM
|
|
|
1741 /**
|
|
|
1742 * Add a new stream to a media file.
|
|
|
1743 *
|
|
|
1744 * Can only be called in the read_header() function. If the flag
|
|
|
1745 * AVFMTCTX_NOHEADER is in the format context, then new streams
|
|
|
1746 * can be added in read_packet too.
|
|
|
1747 *
|
|
|
1748 * @param s media file handle
|
|
|
1749 * @param id file-format-dependent stream ID
|
|
|
1750 */
|
|
|
1751 attribute_deprecated
|
|
|
1752 AVStream *av_new_stream(AVFormatContext *s, int id);
|
|
|
1753 #endif
|
|
|
1754
|
|
|
1755 #if FF_API_SET_PTS_INFO
|
|
|
1756 /**
|
|
|
1757 * @deprecated this function is not supposed to be called outside of lavf
|
|
|
1758 */
|
|
|
1759 attribute_deprecated
|
|
|
1760 void av_set_pts_info(AVStream *s, int pts_wrap_bits,
|
|
|
1761 unsigned int pts_num, unsigned int pts_den);
|
|
|
1762 #endif
|
|
|
1763
|
|
|
1764 #define AVSEEK_FLAG_BACKWARD 1 ///< seek backward
|
|
|
1765 #define AVSEEK_FLAG_BYTE 2 ///< seeking based on position in bytes
|
|
|
1766 #define AVSEEK_FLAG_ANY 4 ///< seek to any frame, even non-keyframes
|
|
|
1767 #define AVSEEK_FLAG_FRAME 8 ///< seeking based on frame number
|
|
|
1768
|
|
|
1769 /**
|
|
|
1770 * @addtogroup lavf_encoding
|
|
|
1771 * @{
|
|
|
1772 */
|
|
|
1773 /**
|
|
|
1774 * Allocate the stream private data and write the stream header to
|
|
|
1775 * an output media file.
|
|
|
1776 *
|
|
|
1777 * @param s Media file handle, must be allocated with avformat_alloc_context().
|
|
|
1778 * Its oformat field must be set to the desired output format;
|
|
|
1779 * Its pb field must be set to an already opened AVIOContext.
|
|
|
1780 * @param options An AVDictionary filled with AVFormatContext and muxer-private options.
|
|
|
1781 * On return this parameter will be destroyed and replaced with a dict containing
|
|
|
1782 * options that were not found. May be NULL.
|
|
|
1783 *
|
|
|
1784 * @return 0 on success, negative AVERROR on failure.
|
|
|
1785 *
|
|
|
1786 * @see av_opt_find, av_dict_set, avio_open, av_oformat_next.
|
|
|
1787 */
|
|
|
1788 int avformat_write_header(AVFormatContext *s, AVDictionary **options);
|
|
|
1789
|
|
|
1790 /**
|
|
|
1791 * Write a packet to an output media file.
|
|
|
1792 *
|
|
|
1793 * The packet shall contain one audio or video frame.
|
|
|
1794 * The packet must be correctly interleaved according to the container
|
|
|
1795 * specification, if not then av_interleaved_write_frame must be used.
|
|
|
1796 *
|
|
|
1797 * @param s media file handle
|
|
|
1798 * @param pkt The packet, which contains the stream_index, buf/buf_size,
|
|
|
1799 * dts/pts, ...
|
|
|
1800 * This can be NULL (at any time, not just at the end), in
|
|
|
1801 * order to immediately flush data buffered within the muxer,
|
|
|
1802 * for muxers that buffer up data internally before writing it
|
|
|
1803 * to the output.
|
|
|
1804 * @return < 0 on error, = 0 if OK, 1 if flushed and there is no more data to flush
|
|
|
1805 */
|
|
|
1806 int av_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
1807
|
|
|
1808 /**
|
|
|
1809 * Write a packet to an output media file ensuring correct interleaving.
|
|
|
1810 *
|
|
|
1811 * The packet must contain one audio or video frame.
|
|
|
1812 * If the packets are already correctly interleaved, the application should
|
|
|
1813 * call av_write_frame() instead as it is slightly faster. It is also important
|
|
|
1814 * to keep in mind that completely non-interleaved input will need huge amounts
|
|
|
1815 * of memory to interleave with this, so it is preferable to interleave at the
|
|
|
1816 * demuxer level.
|
|
|
1817 *
|
|
|
1818 * @param s media file handle
|
|
|
1819 * @param pkt The packet containing the data to be written. pkt->buf must be set
|
|
|
1820 * to a valid AVBufferRef describing the packet data. Libavformat takes
|
|
|
1821 * ownership of this reference and will unref it when it sees fit. The caller
|
|
|
1822 * must not access the data through this reference after this function returns.
|
|
|
1823 * This can be NULL (at any time, not just at the end), to flush the
|
|
|
1824 * interleaving queues.
|
|
|
1825 * Packet's @ref AVPacket.stream_index "stream_index" field must be set to the
|
|
|
1826 * index of the corresponding stream in @ref AVFormatContext.streams
|
|
|
1827 * "s.streams".
|
|
|
1828 * It is very strongly recommended that timing information (@ref AVPacket.pts
|
|
|
1829 * "pts", @ref AVPacket.dts "dts" @ref AVPacket.duration "duration") is set to
|
|
|
1830 * correct values.
|
|
|
1831 *
|
|
|
1832 * @return 0 on success, a negative AVERROR on error.
|
|
|
1833 */
|
|
|
1834 int av_interleaved_write_frame(AVFormatContext *s, AVPacket *pkt);
|
|
|
1835
|
|
|
1836 /**
|
|
|
1837 * Write the stream trailer to an output media file and free the
|
|
|
1838 * file private data.
|
|
|
1839 *
|
|
|
1840 * May only be called after a successful call to avformat_write_header.
|
|
|
1841 *
|
|
|
1842 * @param s media file handle
|
|
|
1843 * @return 0 if OK, AVERROR_xxx on error
|
|
|
1844 */
|
|
|
1845 int av_write_trailer(AVFormatContext *s);
|
|
|
1846
|
|
|
1847 /**
|
|
|
1848 * Return the output format in the list of registered output formats
|
|
|
1849 * which best matches the provided parameters, or return NULL if
|
|
|
1850 * there is no match.
|
|
|
1851 *
|
|
|
1852 * @param short_name if non-NULL checks if short_name matches with the
|
|
|
1853 * names of the registered formats
|
|
|
1854 * @param filename if non-NULL checks if filename terminates with the
|
|
|
1855 * extensions of the registered formats
|
|
|
1856 * @param mime_type if non-NULL checks if mime_type matches with the
|
|
|
1857 * MIME type of the registered formats
|
|
|
1858 */
|
|
|
1859 AVOutputFormat *av_guess_format(const char *short_name,
|
|
|
1860 const char *filename,
|
|
|
1861 const char *mime_type);
|
|
|
1862
|
|
|
1863 /**
|
|
|
1864 * Guess the codec ID based upon muxer and filename.
|
|
|
1865 */
|
|
|
1866 enum AVCodecID av_guess_codec(AVOutputFormat *fmt, const char *short_name,
|
|
|
1867 const char *filename, const char *mime_type,
|
|
|
1868 enum AVMediaType type);
|
|
|
1869
|
|
|
1870 /**
|
|
|
1871 * Get timing information for the data currently output.
|
|
|
1872 * The exact meaning of "currently output" depends on the format.
|
|
|
1873 * It is mostly relevant for devices that have an internal buffer and/or
|
|
|
1874 * work in real time.
|
|
|
1875 * @param s media file handle
|
|
|
1876 * @param stream stream in the media file
|
|
|
1877 * @param[out] dts DTS of the last packet output for the stream, in stream
|
|
|
1878 * time_base units
|
|
|
1879 * @param[out] wall absolute time when that packet whas output,
|
|
|
1880 * in microsecond
|
|
|
1881 * @return 0 if OK, AVERROR(ENOSYS) if the format does not support it
|
|
|
1882 * Note: some formats or devices may not allow to measure dts and wall
|
|
|
1883 * atomically.
|
|
|
1884 */
|
|
|
1885 int av_get_output_timestamp(struct AVFormatContext *s, int stream,
|
|
|
1886 int64_t *dts, int64_t *wall);
|
|
|
1887
|
|
|
1888
|
|
|
1889 /**
|
|
|
1890 * @}
|
|
|
1891 */
|
|
|
1892
|
|
|
1893
|
|
|
1894 /**
|
|
|
1895 * @defgroup lavf_misc Utility functions
|
|
|
1896 * @ingroup libavf
|
|
|
1897 * @{
|
|
|
1898 *
|
|
|
1899 * Miscellaneous utility functions related to both muxing and demuxing
|
|
|
1900 * (or neither).
|
|
|
1901 */
|
|
|
1902
|
|
|
1903 /**
|
|
|
1904 * Send a nice hexadecimal dump of a buffer to the specified file stream.
|
|
|
1905 *
|
|
|
1906 * @param f The file stream pointer where the dump should be sent to.
|
|
|
1907 * @param buf buffer
|
|
|
1908 * @param size buffer size
|
|
|
1909 *
|
|
|
1910 * @see av_hex_dump_log, av_pkt_dump2, av_pkt_dump_log2
|
|
|
1911 */
|
|
|
1912 void av_hex_dump(FILE *f, const uint8_t *buf, int size);
|
|
|
1913
|
|
|
1914 /**
|
|
|
1915 * Send a nice hexadecimal dump of a buffer to the log.
|
|
|
1916 *
|
|
|
1917 * @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
|
1918 * pointer to an AVClass struct.
|
|
|
1919 * @param level The importance level of the message, lower values signifying
|
|
|
1920 * higher importance.
|
|
|
1921 * @param buf buffer
|
|
|
1922 * @param size buffer size
|
|
|
1923 *
|
|
|
1924 * @see av_hex_dump, av_pkt_dump2, av_pkt_dump_log2
|
|
|
1925 */
|
|
|
1926 void av_hex_dump_log(void *avcl, int level, const uint8_t *buf, int size);
|
|
|
1927
|
|
|
1928 /**
|
|
|
1929 * Send a nice dump of a packet to the specified file stream.
|
|
|
1930 *
|
|
|
1931 * @param f The file stream pointer where the dump should be sent to.
|
|
|
1932 * @param pkt packet to dump
|
|
|
1933 * @param dump_payload True if the payload must be displayed, too.
|
|
|
1934 * @param st AVStream that the packet belongs to
|
|
|
1935 */
|
|
|
1936 void av_pkt_dump2(FILE *f, AVPacket *pkt, int dump_payload, AVStream *st);
|
|
|
1937
|
|
|
1938
|
|
|
1939 /**
|
|
|
1940 * Send a nice dump of a packet to the log.
|
|
|
1941 *
|
|
|
1942 * @param avcl A pointer to an arbitrary struct of which the first field is a
|
|
|
1943 * pointer to an AVClass struct.
|
|
|
1944 * @param level The importance level of the message, lower values signifying
|
|
|
1945 * higher importance.
|
|
|
1946 * @param pkt packet to dump
|
|
|
1947 * @param dump_payload True if the payload must be displayed, too.
|
|
|
1948 * @param st AVStream that the packet belongs to
|
|
|
1949 */
|
|
|
1950 void av_pkt_dump_log2(void *avcl, int level, AVPacket *pkt, int dump_payload,
|
|
|
1951 AVStream *st);
|
|
|
1952
|
|
|
1953 /**
|
|
|
1954 * Get the AVCodecID for the given codec tag tag.
|
|
|
1955 * If no codec id is found returns AV_CODEC_ID_NONE.
|
|
|
1956 *
|
|
|
1957 * @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
|
1958 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
|
1959 */
|
|
|
1960 enum AVCodecID av_codec_get_id(const struct AVCodecTag * const *tags, unsigned int tag);
|
|
|
1961
|
|
|
1962 /**
|
|
|
1963 * Get the codec tag for the given codec id id.
|
|
|
1964 * If no codec tag is found returns 0.
|
|
|
1965 *
|
|
|
1966 * @param tags list of supported codec_id-codec_tag pairs, as stored
|
|
|
1967 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
|
1968 */
|
|
|
1969 unsigned int av_codec_get_tag(const struct AVCodecTag * const *tags, enum AVCodecID id);
|
|
|
1970
|
|
|
1971 /**
|
|
|
1972 * Get the codec tag for the given codec id.
|
|
|
1973 *
|
|
|
1974 * @param tags list of supported codec_id - codec_tag pairs, as stored
|
|
|
1975 * in AVInputFormat.codec_tag and AVOutputFormat.codec_tag
|
|
|
1976 * @param id codec id that should be searched for in the list
|
|
|
1977 * @param tag A pointer to the found tag
|
|
|
1978 * @return 0 if id was not found in tags, > 0 if it was found
|
|
|
1979 */
|
|
|
1980 int av_codec_get_tag2(const struct AVCodecTag * const *tags, enum AVCodecID id,
|
|
|
1981 unsigned int *tag);
|
|
|
1982
|
|
|
1983 int av_find_default_stream_index(AVFormatContext *s);
|
|
|
1984
|
|
|
1985 /**
|
|
|
1986 * Get the index for a specific timestamp.
|
|
|
1987 * @param flags if AVSEEK_FLAG_BACKWARD then the returned index will correspond
|
|
|
1988 * to the timestamp which is <= the requested one, if backward
|
|
|
1989 * is 0, then it will be >=
|
|
|
1990 * if AVSEEK_FLAG_ANY seek to any frame, only keyframes otherwise
|
|
|
1991 * @return < 0 if no such timestamp could be found
|
|
|
1992 */
|
|
|
1993 int av_index_search_timestamp(AVStream *st, int64_t timestamp, int flags);
|
|
|
1994
|
|
|
1995 /**
|
|
|
1996 * Add an index entry into a sorted list. Update the entry if the list
|
|
|
1997 * already contains it.
|
|
|
1998 *
|
|
|
1999 * @param timestamp timestamp in the time base of the given stream
|
|
|
2000 */
|
|
|
2001 int av_add_index_entry(AVStream *st, int64_t pos, int64_t timestamp,
|
|
|
2002 int size, int distance, int flags);
|
|
|
2003
|
|
|
2004
|
|
|
2005 /**
|
|
|
2006 * Split a URL string into components.
|
|
|
2007 *
|
|
|
2008 * The pointers to buffers for storing individual components may be null,
|
|
|
2009 * in order to ignore that component. Buffers for components not found are
|
|
|
2010 * set to empty strings. If the port is not found, it is set to a negative
|
|
|
2011 * value.
|
|
|
2012 *
|
|
|
2013 * @param proto the buffer for the protocol
|
|
|
2014 * @param proto_size the size of the proto buffer
|
|
|
2015 * @param authorization the buffer for the authorization
|
|
|
2016 * @param authorization_size the size of the authorization buffer
|
|
|
2017 * @param hostname the buffer for the host name
|
|
|
2018 * @param hostname_size the size of the hostname buffer
|
|
|
2019 * @param port_ptr a pointer to store the port number in
|
|
|
2020 * @param path the buffer for the path
|
|
|
2021 * @param path_size the size of the path buffer
|
|
|
2022 * @param url the URL to split
|
|
|
2023 */
|
|
|
2024 void av_url_split(char *proto, int proto_size,
|
|
|
2025 char *authorization, int authorization_size,
|
|
|
2026 char *hostname, int hostname_size,
|
|
|
2027 int *port_ptr,
|
|
|
2028 char *path, int path_size,
|
|
|
2029 const char *url);
|
|
|
2030
|
|
|
2031
|
|
|
2032 void av_dump_format(AVFormatContext *ic,
|
|
|
2033 int index,
|
|
|
2034 const char *url,
|
|
|
2035 int is_output);
|
|
|
2036
|
|
|
2037 /**
|
|
|
2038 * Return in 'buf' the path with '%d' replaced by a number.
|
|
|
2039 *
|
|
|
2040 * Also handles the '%0nd' format where 'n' is the total number
|
|
|
2041 * of digits and '%%'.
|
|
|
2042 *
|
|
|
2043 * @param buf destination buffer
|
|
|
2044 * @param buf_size destination buffer size
|
|
|
2045 * @param path numbered sequence string
|
|
|
2046 * @param number frame number
|
|
|
2047 * @return 0 if OK, -1 on format error
|
|
|
2048 */
|
|
|
2049 int av_get_frame_filename(char *buf, int buf_size,
|
|
|
2050 const char *path, int number);
|
|
|
2051
|
|
|
2052 /**
|
|
|
2053 * Check whether filename actually is a numbered sequence generator.
|
|
|
2054 *
|
|
|
2055 * @param filename possible numbered sequence string
|
|
|
2056 * @return 1 if a valid numbered sequence string, 0 otherwise
|
|
|
2057 */
|
|
|
2058 int av_filename_number_test(const char *filename);
|
|
|
2059
|
|
|
2060 /**
|
|
|
2061 * Generate an SDP for an RTP session.
|
|
|
2062 *
|
|
|
2063 * Note, this overwrites the id values of AVStreams in the muxer contexts
|
|
|
2064 * for getting unique dynamic payload types.
|
|
|
2065 *
|
|
|
2066 * @param ac array of AVFormatContexts describing the RTP streams. If the
|
|
|
2067 * array is composed by only one context, such context can contain
|
|
|
2068 * multiple AVStreams (one AVStream per RTP stream). Otherwise,
|
|
|
2069 * all the contexts in the array (an AVCodecContext per RTP stream)
|
|
|
2070 * must contain only one AVStream.
|
|
|
2071 * @param n_files number of AVCodecContexts contained in ac
|
|
|
2072 * @param buf buffer where the SDP will be stored (must be allocated by
|
|
|
2073 * the caller)
|
|
|
2074 * @param size the size of the buffer
|
|
|
2075 * @return 0 if OK, AVERROR_xxx on error
|
|
|
2076 */
|
|
|
2077 int av_sdp_create(AVFormatContext *ac[], int n_files, char *buf, int size);
|
|
|
2078
|
|
|
2079 /**
|
|
|
2080 * Return a positive value if the given filename has one of the given
|
|
|
2081 * extensions, 0 otherwise.
|
|
|
2082 *
|
|
|
2083 * @param extensions a comma-separated list of filename extensions
|
|
|
2084 */
|
|
|
2085 int av_match_ext(const char *filename, const char *extensions);
|
|
|
2086
|
|
|
2087 /**
|
|
|
2088 * Test if the given container can store a codec.
|
|
|
2089 *
|
|
|
2090 * @param std_compliance standards compliance level, one of FF_COMPLIANCE_*
|
|
|
2091 *
|
|
|
2092 * @return 1 if codec with ID codec_id can be stored in ofmt, 0 if it cannot.
|
|
|
2093 * A negative number if this information is not available.
|
|
|
2094 */
|
|
|
2095 int avformat_query_codec(AVOutputFormat *ofmt, enum AVCodecID codec_id, int std_compliance);
|
|
|
2096
|
|
|
2097 /**
|
|
|
2098 * @defgroup riff_fourcc RIFF FourCCs
|
|
|
2099 * @{
|
|
|
2100 * Get the tables mapping RIFF FourCCs to libavcodec AVCodecIDs. The tables are
|
|
|
2101 * meant to be passed to av_codec_get_id()/av_codec_get_tag() as in the
|
|
|
2102 * following code:
|
|
|
2103 * @code
|
|
|
2104 * uint32_t tag = MKTAG('H', '2', '6', '4');
|
|
|
2105 * const struct AVCodecTag *table[] = { avformat_get_riff_video_tags(), 0 };
|
|
|
2106 * enum AVCodecID id = av_codec_get_id(table, tag);
|
|
|
2107 * @endcode
|
|
|
2108 */
|
|
|
2109 /**
|
|
|
2110 * @return the table mapping RIFF FourCCs for video to libavcodec AVCodecID.
|
|
|
2111 */
|
|
|
2112 const struct AVCodecTag *avformat_get_riff_video_tags(void);
|
|
|
2113 /**
|
|
|
2114 * @return the table mapping RIFF FourCCs for audio to AVCodecID.
|
|
|
2115 */
|
|
|
2116 const struct AVCodecTag *avformat_get_riff_audio_tags(void);
|
|
|
2117
|
|
|
2118 /**
|
|
|
2119 * @}
|
|
|
2120 */
|
|
|
2121
|
|
|
2122 /**
|
|
|
2123 * Guess the sample aspect ratio of a frame, based on both the stream and the
|
|
|
2124 * frame aspect ratio.
|
|
|
2125 *
|
|
|
2126 * Since the frame aspect ratio is set by the codec but the stream aspect ratio
|
|
|
2127 * is set by the demuxer, these two may not be equal. This function tries to
|
|
|
2128 * return the value that you should use if you would like to display the frame.
|
|
|
2129 *
|
|
|
2130 * Basic logic is to use the stream aspect ratio if it is set to something sane
|
|
|
2131 * otherwise use the frame aspect ratio. This way a container setting, which is
|
|
|
2132 * usually easy to modify can override the coded value in the frames.
|
|
|
2133 *
|
|
|
2134 * @param format the format context which the stream is part of
|
|
|
2135 * @param stream the stream which the frame is part of
|
|
|
2136 * @param frame the frame with the aspect ratio to be determined
|
|
|
2137 * @return the guessed (valid) sample_aspect_ratio, 0/1 if no idea
|
|
|
2138 */
|
|
|
2139 AVRational av_guess_sample_aspect_ratio(AVFormatContext *format, AVStream *stream, AVFrame *frame);
|
|
|
2140
|
|
|
2141 /**
|
|
|
2142 * Guess the frame rate, based on both the container and codec information.
|
|
|
2143 *
|
|
|
2144 * @param ctx the format context which the stream is part of
|
|
|
2145 * @param stream the stream which the frame is part of
|
|
|
2146 * @param frame the frame for which the frame rate should be determined, may be NULL
|
|
|
2147 * @return the guessed (valid) frame rate, 0/1 if no idea
|
|
|
2148 */
|
|
|
2149 AVRational av_guess_frame_rate(AVFormatContext *ctx, AVStream *stream, AVFrame *frame);
|
|
|
2150
|
|
|
2151 /**
|
|
|
2152 * Check if the stream st contained in s is matched by the stream specifier
|
|
|
2153 * spec.
|
|
|
2154 *
|
|
|
2155 * See the "stream specifiers" chapter in the documentation for the syntax
|
|
|
2156 * of spec.
|
|
|
2157 *
|
|
|
2158 * @return >0 if st is matched by spec;
|
|
|
2159 * 0 if st is not matched by spec;
|
|
|
2160 * AVERROR code if spec is invalid
|
|
|
2161 *
|
|
|
2162 * @note A stream specifier can match several streams in the format.
|
|
|
2163 */
|
|
|
2164 int avformat_match_stream_specifier(AVFormatContext *s, AVStream *st,
|
|
|
2165 const char *spec);
|
|
|
2166
|
|
|
2167 int avformat_queue_attached_pictures(AVFormatContext *s);
|
|
|
2168
|
|
|
2169
|
|
|
2170 /**
|
|
|
2171 * @}
|
|
|
2172 */
|
|
|
2173
|
|
|
2174 #endif /* AVFORMAT_AVFORMAT_H */
|
