Mercurial > SDL_sound_CoreAudio
annotate decoders/mp3.c @ 68:0b53ace8b875
Initial add.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 25 Sep 2001 15:46:48 +0000 |
| parents | 40006625142a |
| children | 25e515dfa18d |
| 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 * | |
| 27 * Please see the file LICENSE in the source's root directory. | |
| 28 * | |
| 29 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 30 */ | |
| 31 | |
|
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32 #ifdef SOUND_SUPPORTS_MP3 |
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33 |
| 14 | 34 #include <stdio.h> |
| 35 #include <stdlib.h> | |
| 36 #include <string.h> | |
| 37 #include <assert.h> | |
| 38 | |
| 39 #include "smpeg.h" | |
| 40 #include "SDL_sound.h" | |
| 41 #include "extra_rwops.h" | |
| 42 | |
| 43 #define __SDL_SOUND_INTERNAL__ | |
| 44 #include "SDL_sound_internal.h" | |
| 45 | |
| 46 | |
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47 static int MP3_init(void); |
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48 static void MP3_quit(void); |
| 14 | 49 static int MP3_open(Sound_Sample *sample, const char *ext); |
| 50 static void MP3_close(Sound_Sample *sample); | |
| 51 static Uint32 MP3_read(Sound_Sample *sample); | |
| 52 | |
| 53 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 = | |
| 54 { | |
| 55 { | |
| 56 "MP3", | |
| 57 "MPEG-1 Layer 3 audio through SMPEG", | |
| 58 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 59 "http://www.icculus.org/SDL_sound/" | |
| 60 }, | |
| 61 | |
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62 MP3_init, /* init() method */ |
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63 MP3_quit, /* quit() method */ |
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64 MP3_open, /* open() method */ |
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65 MP3_close, /* close() method */ |
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66 MP3_read /* read() method */ |
| 14 | 67 }; |
| 68 | |
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69 |
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70 static int MP3_init(void) |
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71 { |
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72 return(1); /* always succeeds. */ |
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73 } /* MP3_init */ |
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74 |
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75 |
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76 static void MP3_quit(void) |
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77 { |
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78 /* it's a no-op. */ |
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79 } /* MP3_quit */ |
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80 |
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81 |
| 14 | 82 static __inline__ void output_version(void) |
| 83 { | |
| 84 static int first_time = 1; | |
| 85 | |
| 86 if (first_time) | |
| 87 { | |
| 88 SMPEG_version v; | |
| 89 SMPEG_VERSION(&v); | |
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90 SNDDBG(("MP3: Compiled against SMPEG v%d.%d.%d.\n", |
| 14 | 91 v.major, v.minor, v.patch)); |
| 92 first_time = 0; | |
| 93 } /* if */ | |
| 94 } /* output_version */ | |
| 95 | |
| 96 | |
| 97 static int MP3_open(Sound_Sample *sample, const char *ext) | |
| 98 { | |
| 99 SMPEG *smpeg; | |
| 100 SMPEG_Info smpeg_info; | |
| 101 SDL_AudioSpec spec; | |
| 102 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 103 SDL_RWops *refCounter; | |
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104 Uint8 mp3_magic[2]; |
| 14 | 105 |
| 106 output_version(); | |
| 107 | |
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108 /* |
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109 * SMPEG appears to be far too greedy about what it accepts as input. |
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110 * This test was adapted from SDL_mixer. |
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111 */ |
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112 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1) |
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113 { |
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114 Sound_SetError("MP3: Could not read MP3 magic."); |
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115 return(0); |
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116 } |
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117 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0) |
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118 { |
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119 Sound_SetError("MP3: Not an MP3 stream."); |
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120 return(0); |
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121 } |
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122 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR); |
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123 |
| 14 | 124 refCounter = RWops_RWRefCounter_new(internal->rw); |
| 125 if (refCounter == NULL) | |
| 126 { | |
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127 SNDDBG(("MP3: Failed to create reference counting RWops.\n")); |
| 14 | 128 return(0); |
| 129 } /* if */ | |
| 130 | |
| 131 /* replace original RWops. This is safe. Honest. :) */ | |
| 132 internal->rw = refCounter; | |
| 133 | |
| 134 /* | |
| 135 * increment the refcount, since SMPEG will nuke the RWops if it can't | |
| 136 * accept the contained data... | |
| 137 */ | |
| 138 RWops_RWRefCounter_addRef(refCounter); | |
| 139 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0); | |
| 140 | |
| 141 if (SMPEG_error(smpeg)) | |
| 142 { | |
| 143 Sound_SetError(SMPEG_error(smpeg)); | |
| 144 SMPEG_delete(smpeg); | |
| 145 return(0); | |
| 146 } /* if */ | |
| 147 | |
| 148 if (!smpeg_info.has_audio) | |
| 149 { | |
| 150 Sound_SetError("MP3: No audio stream found in data."); | |
| 151 SMPEG_delete(smpeg); | |
| 152 return(0); | |
| 153 } /* if */ | |
| 154 | |
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155 SNDDBG(("MP3: Accepting data stream.\n")); |
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156 SNDDBG(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE")); |
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157 SNDDBG(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE")); |
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158 SNDDBG(("MP3: width == (%d).\n", smpeg_info.width)); |
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159 SNDDBG(("MP3: height == (%d).\n", smpeg_info.height)); |
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160 SNDDBG(("MP3: current_frame == (%d).\n", smpeg_info.current_frame)); |
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161 SNDDBG(("MP3: current_fps == (%f).\n", smpeg_info.current_fps)); |
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162 SNDDBG(("MP3: audio_string == [%s].\n", smpeg_info.audio_string)); |
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163 SNDDBG(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame)); |
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164 SNDDBG(("MP3: current_offset == (%d).\n", smpeg_info.current_offset)); |
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165 SNDDBG(("MP3: total_size == (%d).\n", smpeg_info.total_size)); |
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166 SNDDBG(("MP3: current_time == (%f).\n", smpeg_info.current_time)); |
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167 SNDDBG(("MP3: total_time == (%f).\n", smpeg_info.total_time)); |
| 14 | 168 |
| 169 SMPEG_enablevideo(smpeg, 0); | |
| 170 SMPEG_enableaudio(smpeg, 1); | |
| 171 SMPEG_loop(smpeg, 0); | |
| 172 | |
| 173 SMPEG_wantedSpec(smpeg, &spec); | |
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174 /* |
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175 * One of the MP3:s I tried wouldn't work unless I added this line |
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176 * to tell SMPEG that yes, it may have the spec it wants. |
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177 */ |
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178 SMPEG_actualSpec(smpeg, &spec); |
| 14 | 179 sample->actual.format = spec.format; |
| 180 sample->actual.rate = spec.freq; | |
| 181 sample->actual.channels = spec.channels; | |
| 182 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 183 internal->decoder_private = smpeg; | |
| 184 | |
| 185 SMPEG_play(smpeg); | |
| 186 return(1); | |
| 187 } /* MP3_open */ | |
| 188 | |
| 189 | |
| 190 static void MP3_close(Sound_Sample *sample) | |
| 191 { | |
| 192 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 193 SMPEG_delete((SMPEG *) internal->decoder_private); | |
| 194 } /* MP3_close */ | |
| 195 | |
| 196 | |
| 197 static Uint32 MP3_read(Sound_Sample *sample) | |
| 198 { | |
| 199 Uint32 retval; | |
| 200 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 201 SMPEG *smpeg = (SMPEG *) internal->decoder_private; | |
| 202 | |
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203 /* |
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204 * We have to clear the buffer because apparently SMPEG_playAudio() |
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205 * will mix the decoded audio with whatever's already in it. Nasty. |
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206 */ |
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207 memset(internal->buffer, 0, internal->buffer_size); |
| 14 | 208 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size); |
| 209 if (retval < internal->buffer_size) | |
| 210 { | |
| 211 char *errMsg = SMPEG_error(smpeg); | |
| 212 if (errMsg == NULL) | |
| 213 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 214 else | |
| 215 { | |
| 216 Sound_SetError(errMsg); | |
| 217 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 218 } /* else */ | |
| 219 } /* if */ | |
| 220 | |
| 221 return(retval); | |
| 222 } /* MP3_read */ | |
| 223 | |
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224 #endif /* SOUND_SUPPORTS_MP3 */ |
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225 |
| 14 | 226 /* end of mp3.c ... */ |
| 227 |