annotate decoders/flac.c @ 278:dfe4a46f88f7

Updated.
author Ryan C. Gordon <icculus@icculus.org>
date Thu, 14 Mar 2002 16:38:32 +0000
parents d3dc34315ac7
children c97be6e1bd27
rev   line source
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1 /*
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2 * SDL_sound -- An abstract sound format decoding API.
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3 * Copyright (C) 2001 Ryan C. Gordon.
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4 *
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5 * This library is free software; you can redistribute it and/or
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6 * modify it under the terms of the GNU Lesser General Public
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7 * License as published by the Free Software Foundation; either
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8 * version 2.1 of the License, or (at your option) any later version.
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9 *
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10 * This library is distributed in the hope that it will be useful,
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 * Lesser General Public License for more details.
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14 *
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15 * You should have received a copy of the GNU Lesser General Public
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16 * License along with this library; if not, write to the Free Software
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17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
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19
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20 /*
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21 * FLAC decoder for SDL_sound.
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22 *
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23 * This driver handles FLAC audio, that is to say the Free Lossless Audio
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24 * Codec. It depends on libFLAC for decoding, which can be grabbed from:
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25 * http://flac.sourceforge.net
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26 *
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27 * Please see the file COPYING in the source's root directory.
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28 *
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29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE)
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30 */
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31
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32 #if HAVE_CONFIG_H
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33 # include <config.h>
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34 #endif
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35
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36 #ifdef SOUND_SUPPORTS_FLAC
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37
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38 #include <stdio.h>
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39 #include <stdlib.h>
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40 #include <string.h>
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41 #include <assert.h>
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42
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43 #include "SDL_sound.h"
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44
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45 #define __SDL_SOUND_INTERNAL__
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46 #include "SDL_sound_internal.h"
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47
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48 /*
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49 * libFLAC 1.0.1 added a seekable stream decoder, but if I understand the
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50 * documentation correctly it's still much easier for us to handle the rewind
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51 * method ourselves.
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52 */
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53
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54 #include "FLAC/stream_decoder.h"
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55
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56
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57 static int FLAC_init(void);
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58 static void FLAC_quit(void);
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59 static int FLAC_open(Sound_Sample *sample, const char *ext);
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60 static void FLAC_close(Sound_Sample *sample);
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61 static Uint32 FLAC_read(Sound_Sample *sample);
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62 static int FLAC_rewind(Sound_Sample *sample);
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63
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64 static const char *extensions_flac[] = { "FLAC", "FLA", NULL };
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65
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66 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC =
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67 {
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68 {
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69 extensions_flac,
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70 "Free Lossless Audio Codec",
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71 "Torbjörn Andersson <d91tan@Update.UU.SE>",
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72 "http://flac.sourceforge.net/"
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73 },
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74
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75 FLAC_init, /* init() method */
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76 FLAC_quit, /* quit() method */
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77 FLAC_open, /* open() method */
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78 FLAC_close, /* close() method */
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79 FLAC_read, /* read() method */
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80 FLAC_rewind /* rewind() method */
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81 };
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82
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83 /* This is what we store in our internal->decoder_private field. */
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84 typedef struct
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85 {
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86 FLAC__StreamDecoder *decoder;
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87 SDL_RWops *rw;
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88 Sound_Sample *sample;
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89 Uint32 data_starting_offset;
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90 Uint32 frame_size;
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91 Uint8 is_flac;
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92 } flac_t;
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93
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94
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95 static void free_flac(flac_t *f)
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96 {
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97 FLAC__stream_decoder_finish(f->decoder);
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98 FLAC__stream_decoder_delete(f->decoder);
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99 free(f);
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100 } /* free_flac */
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101
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102
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103 static FLAC__StreamDecoderReadStatus FLAC_read_callback(
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104 const FLAC__StreamDecoder *decoder, FLAC__byte buffer[],
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105 unsigned int *bytes, void *client_data)
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106 {
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107 flac_t *f = (flac_t *) client_data;
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108 Uint32 retval;
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109
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110 #if 0
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111 SNDDBG(("FLAC: Read callback.\n"));
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112 #endif
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113
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114 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes);
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115
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116 if (retval == 0)
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117 {
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118 *bytes = 0;
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119 f->sample->flags |= SOUND_SAMPLEFLAG_EOF;
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120 return(FLAC__STREAM_DECODER_READ_END_OF_STREAM);
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121 } /* if */
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122
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123 if (retval == -1)
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124 {
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125 *bytes = 0;
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126 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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127 return(FLAC__STREAM_DECODER_READ_ABORT);
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128 } /* if */
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129
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130 if (retval < *bytes)
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131 {
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132 *bytes = retval;
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133 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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134 } /* if */
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135
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136 return(FLAC__STREAM_DECODER_READ_CONTINUE);
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137 } /* FLAC_read_callback */
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138
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139
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140 static FLAC__StreamDecoderWriteStatus FLAC_write_callback(
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141 const FLAC__StreamDecoder *decoder, const FLAC__Frame *frame,
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142 const FLAC__int32 *buffer[], void *client_data)
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143 {
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144 flac_t *f = (flac_t *) client_data;
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145 Uint32 i, j;
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146 Uint32 sample;
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147 Uint8 *dst;
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148
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149 #if 0
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150 SNDDBG(("FLAC: Write callback.\n"));
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151 #endif
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152
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153 f->frame_size = frame->header.channels * frame->header.blocksize
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154 * frame->header.bits_per_sample / 8;
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155
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156 if (f->frame_size > f->sample->buffer_size)
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157 Sound_SetBufferSize(f->sample, f->frame_size);
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158
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159 dst = f->sample->buffer;
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160
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
161 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
162 * be converted. Unfortunately the buffer is read-only, so we either
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
163 * have to check for each sample, or make a copy of the buffer. I'm
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
164 * not sure which way is best, so I've arbitrarily picked the former.
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
165 */
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
166 if (f->sample->actual.format == AUDIO_S8)
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
167 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
168 for (i = 0; i < frame->header.blocksize; i++)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
169 for (j = 0; j < frame->header.channels; j++)
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
170 {
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
171 sample = buffer[j][i];
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
172 if (frame->header.bits_per_sample < 8)
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
173 sample <<= (8 - frame->header.bits_per_sample);
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
174 *dst++ = sample & 0x00ff;
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
175 } /* for */
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
176 } /* if */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
177 else
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
178 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
179 for (i = 0; i < frame->header.blocksize; i++)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
180 for (j = 0; j < frame->header.channels; j++)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
181 {
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
182 sample = buffer[j][i];
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
183 if (frame->header.bits_per_sample < 16)
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
184 sample <<= (16 - frame->header.bits_per_sample);
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
185 else if (frame->header.bits_per_sample > 16)
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
186 sample >>= (frame->header.bits_per_sample - 16);
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
187 *dst++ = (sample & 0xff00) >> 8;
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
188 *dst++ = sample & 0x00ff;
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
189 } /* for */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
190 } /* else */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
191
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
192 return(FLAC__STREAM_DECODER_WRITE_CONTINUE);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
193 } /* FLAC_write_callback */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
194
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
195
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
196 void FLAC_metadata_callback(
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
197 const FLAC__StreamDecoder *decoder, const FLAC__StreamMetaData *metadata,
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
198 void *client_data)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
199 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
200 flac_t *f = (flac_t *) client_data;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
201
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
202 SNDDBG(("FLAC: Metadata callback.\n"));
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
203
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
204 /* There are several kinds of metadata, but STREAMINFO is the only
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
205 * one that always has to be there.
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
206 */
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
207 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
208 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
209 SNDDBG(("FLAC: Metadata is streaminfo.\n"));
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
210
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
211 f->is_flac = 1;
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
212 f->sample->actual.channels = metadata->data.stream_info.channels;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
213 f->sample->actual.rate = metadata->data.stream_info.sample_rate;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
214
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
215 if (metadata->data.stream_info.bits_per_sample > 8)
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
216 f->sample->actual.format = AUDIO_S16MSB;
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
217 else
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
218 f->sample->actual.format = AUDIO_S8;
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
219 } /* if */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
220 } /* FLAC_metadata_callback */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
221
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
222
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
223 void FLAC_error_callback(
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
224 const FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorStatus status,
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
225 void *client_data)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
226 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
227 flac_t *f = (flac_t *) client_data;
164
77482005beb6 Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents: 155
diff changeset
228
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
229 /* !!! FIXME: Is every error really fatal? I don't know... */
164
77482005beb6 Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents: 155
diff changeset
230 Sound_SetError(FLAC__StreamDecoderErrorStatusString[status]);
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
231 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
232 } /* FLAC_error_callback */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
233
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
234
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
235 static int FLAC_init(void)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
236 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
237 return(1); /* always succeeds. */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
238 } /* FLAC_init */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
239
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
240
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
241 static void FLAC_quit(void)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
242 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
243 /* it's a no-op. */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
244 } /* FLAC_quit */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
245
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
246
182
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
247 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
248
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
249 static int FLAC_open(Sound_Sample *sample, const char *ext)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
250 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
251 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
252 SDL_RWops *rw = internal->rw;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
253 FLAC__StreamDecoder *decoder;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
254 flac_t *f;
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
255 int i;
182
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
256 int has_extension = 0;
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
257
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
258 /*
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
259 * If the extension is "flac", we'll believe that this is really meant
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
260 * to be a FLAC stream, and will try to grok it from existing metadata.
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
261 * metadata searching can be a very expensive operation, however, so
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
262 * unless the user swears that it is a FLAC stream through the extension,
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
263 * we decide what to do based on the existance of a 32-bit magic number.
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
264 */
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
265 for (i = 0; extensions_flac[i] != NULL; i++)
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
266 {
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
267 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0)
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
268 {
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
269 has_extension = 1;
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
270 break;
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
271 } /* if */
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
272 } /* for */
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
273
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
274 if (!has_extension)
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
275 {
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
276 int rc;
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
277 Uint32 flac_magic = SDL_ReadLE32(rw);
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
278 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0);
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
279
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
280 /* move back over magic number for metadata scan... */
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
281 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR);
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
282 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0);
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
283 } /* if */
155
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
284
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
285 f = (flac_t *) malloc(sizeof (flac_t));
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
286 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
287
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
288 decoder = FLAC__stream_decoder_new();
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
289 if (decoder == NULL)
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
290 {
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
291 Sound_SetError(ERR_OUT_OF_MEMORY);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
292 free(f);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
293 return(0);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
294 } /* if */
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
295
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
296 FLAC__stream_decoder_set_read_callback(decoder, FLAC_read_callback);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
297 FLAC__stream_decoder_set_write_callback(decoder, FLAC_write_callback);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
298 FLAC__stream_decoder_set_metadata_callback(decoder, FLAC_metadata_callback);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
299 FLAC__stream_decoder_set_error_callback(decoder, FLAC_error_callback);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
300 FLAC__stream_decoder_set_client_data(decoder, f);
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
301
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
302 f->rw = internal->rw;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
303 f->sample = sample;
72ff7d3a25b6 Initial add.
Ryan C. Gordon <icculus@icculus.org>
parents:
diff changeset
304 f->decoder = decoder;
164
77482005beb6 Now includes FLAC/stream_decoder.h instead of FLAC/all.h. More robust
Ryan C. Gordon <icculus@icculus.org>
parents: 155
diff changeset
305 f->sample->actual.format = 0;
182
3849438b735e Checks magic number again, unless the file extension is recognized.
Ryan C. Gordon <icculus@icculus.org>
parents: 166
diff changeset
306 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */;
166
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
307
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
308 internal->decoder_private = f;
d8904267d23c Cleanups, fixes and enhancements by Torbj�rn Andersson.
Ryan C. Gordon <icculus@icculus.org>
parents: 164
diff changeset
309 FLAC__stream_decoder_init(decoder);
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310
182
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311 /*
231
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312 * Annoyingly, the rewind method will put the FLAC decoder in a state
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313 * where it expects to read metadata, so we have to set this marker
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314 * before the metadata block.
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315 */
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316 f->data_starting_offset = SDL_RWtell(f->rw);
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317
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318 /*
182
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319 * If we are not sure this is a FLAC stream, check for the STREAMINFO
166
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320 * metadata block. If not, we'd have to peek at the first audio frame
182
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321 * and get the sound format from there, but that is not yet
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322 * implemented.
166
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323 */
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324 if (!f->is_flac)
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325 {
166
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326 FLAC__stream_decoder_process_metadata(decoder);
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327
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328 /* Still not FLAC? Give up. */
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329 if (!f->is_flac)
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330 {
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331 Sound_SetError("FLAC: No metadata found. Not a FLAC stream?");
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332 free_flac(f);
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333 return(0);
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334 } /* if */
155
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335 } /* if */
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336
164
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337 SNDDBG(("FLAC: Accepting data stream.\n"));
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338
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339 sample->flags = SOUND_SAMPLEFLAG_NONE;
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340 return(1);
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341 } /* FLAC_open */
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342
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343
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344 static void FLAC_close(Sound_Sample *sample)
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345 {
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346 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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347 flac_t *f = (flac_t *) internal->decoder_private;
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348
166
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349 free_flac(f);
155
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350 } /* FLAC_close */
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351
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352
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353 static Uint32 FLAC_read(Sound_Sample *sample)
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354 {
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355 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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356 flac_t *f = (flac_t *) internal->decoder_private;
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357 Uint32 len;
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358
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359 if (!FLAC__stream_decoder_process_one_frame(f->decoder))
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360 {
164
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361 Sound_SetError("FLAC: Couldn't decode frame.");
155
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362 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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363 return(0);
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364 } /* if */
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365
231
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366 if (FLAC__stream_decoder_get_state(f->decoder) == FLAC__STREAM_DECODER_END_OF_STREAM)
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367 {
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368 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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369 return(0);
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370 } /* if */
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371
164
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372 /* An error may have been signalled through the error callback. */
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373 if (sample->flags & SOUND_SAMPLEFLAG_ERROR)
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374 return(0);
231
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375
155
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376 return(f->frame_size);
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377 } /* FLAC_read */
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378
221
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379
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380 static int FLAC_rewind(Sound_Sample *sample)
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381 {
231
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382 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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383 flac_t *f = (flac_t *) internal->decoder_private;
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384 int rc = SDL_RWseek(f->rw, f->data_starting_offset, SEEK_SET);
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385
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386 BAIL_IF_MACRO(rc != f->data_starting_offset, ERR_IO_ERROR, 0);
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387 BAIL_IF_MACRO(!FLAC__stream_decoder_reset(f->decoder),
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diff changeset
388 "FLAC: could not reset decoder", 0);
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389 FLAC__stream_decoder_process_metadata(f->decoder);
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390 return(1);
221
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391 } /* FLAC_rewind */
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392
155
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393 #endif /* SOUND_SUPPORTS_FLAC */
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394
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395
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396 /* end of flac.c ... */