Mercurial > SDL_sound_CoreAudio
annotate decoders/mp3.c @ 221:c9772a9f5271
Initial implementation or stubs for rewind method. Other cleanups.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 17 Jan 2002 20:53:53 +0000 |
| parents | 5b311ffabe45 |
| children | d3dc34315ac7 |
| rev | line source |
|---|---|
| 14 | 1 /* |
| 2 * SDL_sound -- An abstract sound format decoding API. | |
| 3 * Copyright (C) 2001 Ryan C. Gordon. | |
| 4 * | |
| 5 * This library is free software; you can redistribute it and/or | |
| 6 * modify it under the terms of the GNU Lesser General Public | |
| 7 * License as published by the Free Software Foundation; either | |
| 8 * version 2.1 of the License, or (at your option) any later version. | |
| 9 * | |
| 10 * This library is distributed in the hope that it will be useful, | |
| 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 * Lesser General Public License for more details. | |
| 14 * | |
| 15 * You should have received a copy of the GNU Lesser General Public | |
| 16 * License along with this library; if not, write to the Free Software | |
| 17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 */ | |
| 19 | |
| 20 /* | |
| 21 * MPEG-1 Layer 3, or simply, "MP3", decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles all those highly compressed songs you stole through | |
| 24 * Napster. :) It depends on the SMPEG library for decoding, which can | |
| 25 * be grabbed from: http://www.lokigames.com/development/smpeg.php3 | |
| 26 * | |
|
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27 * This should also be able to extract the audio stream from an MPEG movie. |
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28 * |
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29 * Please see the file COPYING in the source's root directory. |
| 14 | 30 * |
| 31 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 32 */ | |
| 33 | |
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34 #if HAVE_CONFIG_H |
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35 # include <config.h> |
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36 #endif |
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37 |
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38 #ifdef SOUND_SUPPORTS_MP3 |
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39 |
| 14 | 40 #include <stdio.h> |
| 41 #include <stdlib.h> | |
| 42 #include <string.h> | |
| 43 #include <assert.h> | |
| 44 | |
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45 #include "SDL_sound.h" |
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46 |
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47 #define __SDL_SOUND_INTERNAL__ |
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48 #include "SDL_sound_internal.h" |
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49 |
| 14 | 50 #include "smpeg.h" |
| 51 #include "extra_rwops.h" | |
| 52 | |
| 53 | |
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54 static int MP3_init(void); |
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55 static void MP3_quit(void); |
| 14 | 56 static int MP3_open(Sound_Sample *sample, const char *ext); |
| 57 static void MP3_close(Sound_Sample *sample); | |
| 58 static Uint32 MP3_read(Sound_Sample *sample); | |
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59 static int MP3_rewind(Sound_Sample *sample); |
| 14 | 60 |
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61 static const char *extensions_smpeg[] = { "MP3", "MPEG", "MPG", NULL }; |
| 14 | 62 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 = |
| 63 { | |
| 64 { | |
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65 extensions_smpeg, |
| 14 | 66 "MPEG-1 Layer 3 audio through SMPEG", |
| 67 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
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68 "http://www.lokigames.com/development/smpeg.php3" |
| 14 | 69 }, |
| 70 | |
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71 MP3_init, /* init() method */ |
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72 MP3_quit, /* quit() method */ |
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73 MP3_open, /* open() method */ |
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74 MP3_close, /* close() method */ |
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75 MP3_read, /* read() method */ |
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76 MP3_rewind /* rewind() method */ |
| 14 | 77 }; |
| 78 | |
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79 |
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80 static int MP3_init(void) |
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81 { |
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82 return(1); /* always succeeds. */ |
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83 } /* MP3_init */ |
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84 |
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85 |
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86 static void MP3_quit(void) |
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87 { |
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88 /* it's a no-op. */ |
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89 } /* MP3_quit */ |
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90 |
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91 |
| 14 | 92 static __inline__ void output_version(void) |
| 93 { | |
| 94 static int first_time = 1; | |
| 95 | |
| 96 if (first_time) | |
| 97 { | |
| 98 SMPEG_version v; | |
| 99 SMPEG_VERSION(&v); | |
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100 SNDDBG(("MP3: Compiled against SMPEG v%d.%d.%d.\n", |
| 14 | 101 v.major, v.minor, v.patch)); |
| 102 first_time = 0; | |
| 103 } /* if */ | |
| 104 } /* output_version */ | |
| 105 | |
| 106 | |
| 107 static int MP3_open(Sound_Sample *sample, const char *ext) | |
| 108 { | |
| 109 SMPEG *smpeg; | |
| 110 SMPEG_Info smpeg_info; | |
| 111 SDL_AudioSpec spec; | |
| 112 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 113 SDL_RWops *refCounter; | |
| 114 | |
| 115 output_version(); | |
| 116 | |
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117 /* |
| 96 | 118 * If I understand things correctly, MP3 files don't really have any |
| 119 * magic header we can check for. The MP3 player is expected to just | |
| 120 * pick the first thing that looks like a valid frame and start | |
| 121 * playing from there. | |
| 122 * | |
| 123 * So here's what we do: If the caller insists that this is really | |
| 124 * MP3 we'll take his word for it. Otherwise, use the same test as | |
| 125 * SDL_mixer does and check if the stream starts with something that | |
| 126 * looks like a frame. | |
| 127 * | |
| 128 * A frame begins with 11 bits of frame sync (all bits must be set), | |
| 129 * followed by a two-bit MPEG Audio version ID: | |
| 130 * | |
| 131 * 00 - MPEG Version 2.5 (later extension of MPEG 2) | |
| 132 * 01 - reserved | |
| 133 * 10 - MPEG Version 2 (ISO/IEC 13818-3) | |
| 134 * 11 - MPEG Version 1 (ISO/IEC 11172-3) | |
| 135 * | |
| 136 * Apparently we don't handle MPEG Version 2.5. | |
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137 */ |
| 96 | 138 if (__Sound_strcasecmp(ext, "MP3") != 0) |
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139 { |
| 96 | 140 Uint8 mp3_magic[2]; |
| 141 | |
| 142 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1) | |
| 143 { | |
| 144 Sound_SetError("MP3: Could not read MP3 magic."); | |
| 145 return(0); | |
| 146 } /*if */ | |
| 147 | |
| 148 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0) | |
| 149 { | |
| 150 Sound_SetError("MP3: Not an MP3 stream."); | |
| 151 return(0); | |
| 152 } /* if */ | |
| 153 | |
| 154 /* !!! FIXME: If the seek fails, we'll probably miss a frame */ | |
| 155 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR); | |
| 156 } /* if */ | |
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157 |
| 14 | 158 refCounter = RWops_RWRefCounter_new(internal->rw); |
| 159 if (refCounter == NULL) | |
| 160 { | |
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161 SNDDBG(("MP3: Failed to create reference counting RWops.\n")); |
| 14 | 162 return(0); |
| 163 } /* if */ | |
| 164 | |
| 165 /* replace original RWops. This is safe. Honest. :) */ | |
| 166 internal->rw = refCounter; | |
| 167 | |
| 168 /* | |
| 169 * increment the refcount, since SMPEG will nuke the RWops if it can't | |
| 170 * accept the contained data... | |
| 171 */ | |
| 172 RWops_RWRefCounter_addRef(refCounter); | |
| 173 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0); | |
| 174 | |
| 175 if (SMPEG_error(smpeg)) | |
| 176 { | |
| 177 Sound_SetError(SMPEG_error(smpeg)); | |
| 178 SMPEG_delete(smpeg); | |
| 179 return(0); | |
| 180 } /* if */ | |
| 181 | |
| 182 if (!smpeg_info.has_audio) | |
| 183 { | |
| 184 Sound_SetError("MP3: No audio stream found in data."); | |
| 185 SMPEG_delete(smpeg); | |
| 186 return(0); | |
| 187 } /* if */ | |
| 188 | |
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189 SNDDBG(("MP3: Accepting data stream.\n")); |
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190 SNDDBG(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE")); |
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191 SNDDBG(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE")); |
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192 SNDDBG(("MP3: width == (%d).\n", smpeg_info.width)); |
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193 SNDDBG(("MP3: height == (%d).\n", smpeg_info.height)); |
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194 SNDDBG(("MP3: current_frame == (%d).\n", smpeg_info.current_frame)); |
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195 SNDDBG(("MP3: current_fps == (%f).\n", smpeg_info.current_fps)); |
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196 SNDDBG(("MP3: audio_string == [%s].\n", smpeg_info.audio_string)); |
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197 SNDDBG(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame)); |
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198 SNDDBG(("MP3: current_offset == (%d).\n", smpeg_info.current_offset)); |
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199 SNDDBG(("MP3: total_size == (%d).\n", smpeg_info.total_size)); |
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200 SNDDBG(("MP3: current_time == (%f).\n", smpeg_info.current_time)); |
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201 SNDDBG(("MP3: total_time == (%f).\n", smpeg_info.total_time)); |
| 14 | 202 |
| 203 SMPEG_enablevideo(smpeg, 0); | |
| 204 SMPEG_enableaudio(smpeg, 1); | |
| 205 SMPEG_loop(smpeg, 0); | |
| 206 | |
| 207 SMPEG_wantedSpec(smpeg, &spec); | |
| 96 | 208 |
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209 /* |
| 96 | 210 * One of the MP3s I tried wouldn't work unless I added this line |
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211 * to tell SMPEG that yes, it may have the spec it wants. |
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212 */ |
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213 SMPEG_actualSpec(smpeg, &spec); |
| 14 | 214 sample->actual.format = spec.format; |
| 215 sample->actual.rate = spec.freq; | |
| 216 sample->actual.channels = spec.channels; | |
| 217 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 218 internal->decoder_private = smpeg; | |
| 219 | |
| 220 SMPEG_play(smpeg); | |
| 221 return(1); | |
| 222 } /* MP3_open */ | |
| 223 | |
| 224 | |
| 225 static void MP3_close(Sound_Sample *sample) | |
| 226 { | |
| 227 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 228 SMPEG_delete((SMPEG *) internal->decoder_private); | |
| 229 } /* MP3_close */ | |
| 230 | |
| 231 | |
| 232 static Uint32 MP3_read(Sound_Sample *sample) | |
| 233 { | |
| 234 Uint32 retval; | |
| 235 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 236 SMPEG *smpeg = (SMPEG *) internal->decoder_private; | |
| 237 | |
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238 /* |
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239 * We have to clear the buffer because apparently SMPEG_playAudio() |
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240 * will mix the decoded audio with whatever's already in it. Nasty. |
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241 */ |
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242 memset(internal->buffer, 0, internal->buffer_size); |
| 14 | 243 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size); |
| 244 if (retval < internal->buffer_size) | |
| 245 { | |
| 246 char *errMsg = SMPEG_error(smpeg); | |
| 247 if (errMsg == NULL) | |
| 248 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 249 else | |
| 250 { | |
| 251 Sound_SetError(errMsg); | |
| 252 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 253 } /* else */ | |
| 254 } /* if */ | |
| 255 | |
| 256 return(retval); | |
| 257 } /* MP3_read */ | |
| 258 | |
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259 |
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260 static int MP3_rewind(Sound_Sample *sample) |
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261 { |
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262 /* !!! FIXME. */ |
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263 SNDDBG(("MP3_rewind(): Write me!\n")); |
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264 assert(0); |
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265 return(0); |
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266 } /* MP3_rewind */ |
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267 |
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268 #endif /* SOUND_SUPPORTS_MP3 */ |
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269 |
| 14 | 270 /* end of mp3.c ... */ |
| 271 |