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annotate decoders/raw.c @ 474:c66080364dff

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Most decoders now report total sample play time, now. Technically, this breaks binary compatibility with the 1.0 branch, since it extends the Sound_Sample struct, but most (all?) programs are just passing pointers allocated by SDL_sound around, and might be okay. Source-level compatibility is not broken...yet! :) --ryan. -------- Original Message -------- Subject: SDL_sound patch: Finding total length of time of sound file. Date: Sun, 26 Jan 2003 09:31:17 -0800 (PST) Hi Ryan, I am working with Eric Wing and helping him modify SDL_sound. AS part of our efforts in improving and enhancing SDL_sound, we like to submit this patch. We modified the codecs to find the total time of a sound file. Below is the explanation of the patch. The patch is appended as an attachment to this email. * MOTIVATION: We needed the ability to get the total play time of a sample (And we noticed that we're not the only ones). Since SDL_sound blocks direct access to the specific decoders, there is no way for a user to know this information short of decoding the whole thing. Because of this, we believe this will be a useful addition, even though the accuracy may not be perfect (subject to each decoder) or the information may not always be available. * CONTRIBUTORS: Wesley Leong (modified the majority of the codecs and verified the results) Eric Wing (showed everyone how to do modify codec, modified mikmod) Wang Lam (modified a handful of codecs, researched into specs and int overflow) Ahilan Anantha (modified a few codecs and helped with integer math) * GENERAL ISSUES: We chose the value to be milliseconds as an Sint32. Milliseconds because that's what Sound_Seek takes as a parameter and -1 to allow for instances/codecs where the value could not be determined. We are not sure if this is the final convention you want, so we are willing to work with you on this. We also expect the total_time field to be set on open and never again modified by SDL_sound. Users may access it directly much like the sample buffer and buffer_size. We thought about recomputing the time on DecodeAll, but since users may seek or decode small chunks first, not all the data may be there. So this is better done by the user. This may be good information to document. Currently, all the main codecs are implemented except for QuickTime.
author Ryan C. Gordon <icculus@icculus.org>
date Sat, 08 May 2004 08:19:50 +0000
parents fb519e6028e3
children 3e705c9180e5
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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 * RAW decoder for SDL_sound. This is as simple as it gets.
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22 *
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23 * This driver handles raw audio data. You must, regardless of where the
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24 * data is actually coming from, specify the string "RAW" in the extension
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25 * parameter of Sound_NewSample() (or, alternately, open a file with the
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26 * extension ".raw" in Sound_NewSampleFromFile()). The string is checked
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27 * case-insensitive. We need this check, because raw data, being raw, has
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28 * no headers or magic number we can use to determine if we should handle a
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29 * given file, so we needed some way to have this "decoder" discriminate.
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30 *
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31 * When calling Sound_NewSample*(), you must also specify a "desired"
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32 * audio format. The "actual" format will always match what you specify, so
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33 * there will be no conversion overhead, but these routines need to know how
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34 * to treat the bits, since it's all random garbage otherwise.
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35 *
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36 * Please see the file COPYING in the source's root directory.
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37 *
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38 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org)
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39 */
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40
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41 #if HAVE_CONFIG_H
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42 # include <config.h>
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43 #endif
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45 #ifdef SOUND_SUPPORTS_RAW
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46
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47 #include <stdio.h>
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48 #include <stdlib.h>
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49 #include <string.h>
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50
106
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51 #include "SDL_sound.h"
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52
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53 #define __SDL_SOUND_INTERNAL__
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54 #include "SDL_sound_internal.h"
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55
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56 static int RAW_init(void);
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57 static void RAW_quit(void);
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58 static int RAW_open(Sound_Sample *sample, const char *ext);
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59 static void RAW_close(Sound_Sample *sample);
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60 static Uint32 RAW_read(Sound_Sample *sample);
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61 static int RAW_rewind(Sound_Sample *sample);
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62 static int RAW_seek(Sound_Sample *sample, Uint32 ms);
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64 static const char *extensions_raw[] = { "RAW", NULL };
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65 const Sound_DecoderFunctions __Sound_DecoderFunctions_RAW =
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66 {
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67 {
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68 extensions_raw,
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69 "Raw audio",
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70 "Ryan C. Gordon <icculus@clutteredmind.org>",
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71 "http://www.icculus.org/SDL_sound/"
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72 },
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74 RAW_init, /* init() method */
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75 RAW_quit, /* quit() method */
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76 RAW_open, /* open() method */
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77 RAW_close, /* close() method */
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78 RAW_read, /* read() method */
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79 RAW_rewind, /* rewind() method */
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80 RAW_seek /* seek() method */
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81 };
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84 static int RAW_init(void)
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85 {
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86 return(1); /* always succeeds. */
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87 } /* RAW_init */
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88
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89
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90 static void RAW_quit(void)
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91 {
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92 /* it's a no-op. */
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93 } /* RAW_quit */
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96 static int RAW_open(Sound_Sample *sample, const char *ext)
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97 {
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98 Sound_SampleInternal *internal = sample->opaque;
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99 SDL_RWops *rw = internal->rw;
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100 Uint32 pos, sample_rate;
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101
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102 /*
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103 * We check this explicitly, since we have no other way to
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104 * determine whether we should handle this data or not.
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105 */
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106 if (__Sound_strcasecmp(ext, "RAW") != 0)
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107 BAIL_MACRO("RAW: extension isn't explicitly \"RAW\".", 0);
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108
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109 /*
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110 * You must also specify a desired format, so we know how to
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111 * treat the bits that are otherwise binary garbage.
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112 */
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113 if ( (sample->desired.channels < 1) ||
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114 (sample->desired.channels > 2) ||
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115 (sample->desired.rate == 0) ||
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116 (sample->desired.format == 0) )
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117 {
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118 BAIL_MACRO("RAW: invalid desired format.", 0);
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119 } /* if */
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120
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121 SNDDBG(("RAW: Accepting data stream.\n"));
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122
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123 /*
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124 * We never convert raw samples; what you ask for is what you get.
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125 */
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126 memcpy(&sample->actual, &sample->desired, sizeof (Sound_AudioInfo));
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127 sample->flags = SOUND_SAMPLEFLAG_CANSEEK;
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128
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129 if ( (pos = SDL_RWseek(internal->rw, 0, SEEK_END) ) <= 0) {
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130 BAIL_MACRO("RAW: cannot seek the end of the file \"RAW\".", 0);
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131 }
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132 if ( SDL_RWseek(internal->rw, 0, SEEK_SET) ) {
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133 BAIL_MACRO("RAW: cannot reset file \"RAW\".", 0);
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134 }
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135
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136 sample_rate = (sample->actual.rate * sample->actual.channels
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137 * ( (sample->actual.format & 0x0018) >> 3) );
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138 sample->total_time = ( pos ) / sample_rate * 1000;
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139 sample->total_time += (pos % sample_rate) * 1000 / sample_rate;
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140
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141 return(1); /* we'll handle this data. */
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142 } /* RAW_open */
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143
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144
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145 static void RAW_close(Sound_Sample *sample)
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146 {
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147 /* we don't allocate anything that we need to free. That's easy, eh? */
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148 } /* RAW_close */
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149
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150
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151 static Uint32 RAW_read(Sound_Sample *sample)
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152 {
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153 Uint32 retval;
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154 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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155
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156 /*
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157 * We don't actually do any decoding, so we read the raw data
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158 * directly into the internal buffer...
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159 */
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160 retval = SDL_RWread(internal->rw, internal->buffer,
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161 1, internal->buffer_size);
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162
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163 /* Make sure the read went smoothly... */
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164 if (retval == 0)
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165 sample->flags |= SOUND_SAMPLEFLAG_EOF;
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166
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167 else if (retval == -1)
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168 sample->flags |= SOUND_SAMPLEFLAG_ERROR;
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169
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170 /* (next call this EAGAIN may turn into an EOF or error.) */
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171 else if (retval < internal->buffer_size)
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172 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN;
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173
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174 return(retval);
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175 } /* RAW_read */
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176
221
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177
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178 static int RAW_rewind(Sound_Sample *sample)
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179 {
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180 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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181 BAIL_IF_MACRO(SDL_RWseek(internal->rw, 0, SEEK_SET) != 0, ERR_IO_ERROR, 0);
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182 return(1);
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183 } /* RAW_rewind */
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184
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185
306
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186 static int RAW_seek(Sound_Sample *sample, Uint32 ms)
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187 {
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188 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque;
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189 int pos = (int) __Sound_convertMsToBytePos(&sample->actual, ms);
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190 int err = (SDL_RWseek(internal->rw, pos, SEEK_SET) != pos);
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191 BAIL_IF_MACRO(err, ERR_IO_ERROR, 0);
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192 return(1);
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193 } /* RAW_seek */
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194
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195
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196 #endif /* SOUND_SUPPORTS_RAW */
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197
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198
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199 /* end of raw.c ... */
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200