Mercurial > SDL_sound_CoreAudio
annotate decoders/mp3.c @ 61:7d3a6ea7f1f0
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Mon, 24 Sep 2001 15:31:03 +0000 |
| parents | 6df2f69e037e |
| children | b13fafb976be |
| 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 | |
| 32 #include <stdio.h> | |
| 33 #include <stdlib.h> | |
| 34 #include <string.h> | |
| 35 #include <assert.h> | |
| 36 | |
| 37 #include "smpeg.h" | |
| 38 #include "SDL_sound.h" | |
| 39 #include "extra_rwops.h" | |
| 40 | |
| 41 #define __SDL_SOUND_INTERNAL__ | |
| 42 #include "SDL_sound_internal.h" | |
| 43 | |
| 44 #if (!defined SOUND_SUPPORTS_MP3) | |
| 45 #error SOUND_SUPPORTS_MP3 must be defined. | |
| 46 #endif | |
| 47 | |
| 48 | |
|
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49 static int MP3_init(void); |
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50 static void MP3_quit(void); |
| 14 | 51 static int MP3_open(Sound_Sample *sample, const char *ext); |
| 52 static void MP3_close(Sound_Sample *sample); | |
| 53 static Uint32 MP3_read(Sound_Sample *sample); | |
| 54 | |
| 55 const Sound_DecoderFunctions __Sound_DecoderFunctions_MP3 = | |
| 56 { | |
| 57 { | |
| 58 "MP3", | |
| 59 "MPEG-1 Layer 3 audio through SMPEG", | |
| 60 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 61 "http://www.icculus.org/SDL_sound/" | |
| 62 }, | |
| 63 | |
|
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64 MP3_init, /* init() method */ |
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65 MP3_quit, /* quit() method */ |
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66 MP3_open, /* open() method */ |
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67 MP3_close, /* close() method */ |
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68 MP3_read /* read() method */ |
| 14 | 69 }; |
| 70 | |
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71 |
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72 static int MP3_init(void) |
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73 { |
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74 return(1); /* always succeeds. */ |
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75 } /* MP3_init */ |
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76 |
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77 |
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78 static void MP3_quit(void) |
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79 { |
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80 /* it's a no-op. */ |
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81 } /* MP3_quit */ |
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82 |
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83 |
| 14 | 84 static __inline__ void output_version(void) |
| 85 { | |
| 86 static int first_time = 1; | |
| 87 | |
| 88 if (first_time) | |
| 89 { | |
| 90 SMPEG_version v; | |
| 91 SMPEG_VERSION(&v); | |
| 92 _D(("MP3: Compiled against SMPEG v%d.%d.%d.\n", | |
| 93 v.major, v.minor, v.patch)); | |
| 94 first_time = 0; | |
| 95 } /* if */ | |
| 96 } /* output_version */ | |
| 97 | |
| 98 | |
| 99 static int MP3_open(Sound_Sample *sample, const char *ext) | |
| 100 { | |
| 101 SMPEG *smpeg; | |
| 102 SMPEG_Info smpeg_info; | |
| 103 SDL_AudioSpec spec; | |
| 104 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 105 SDL_RWops *refCounter; | |
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106 Uint8 mp3_magic[2]; |
| 14 | 107 |
| 108 output_version(); | |
| 109 | |
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110 /* |
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111 * SMPEG appears to be far too greedy about what it accepts as input. |
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112 * This test was adapted from SDL_mixer. |
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113 */ |
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114 if (SDL_RWread(internal->rw, mp3_magic, sizeof (mp3_magic), 1) != 1) |
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115 { |
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116 Sound_SetError("MP3: Could not read MP3 magic."); |
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117 return(0); |
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118 } |
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119 if (mp3_magic[0] != 0xFF || (mp3_magic[1] & 0xF0) != 0xF0) |
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120 { |
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121 Sound_SetError("MP3: Not an MP3 stream."); |
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122 return(0); |
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123 } |
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124 SDL_RWseek(internal->rw, -sizeof (mp3_magic), SEEK_CUR); |
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125 |
| 14 | 126 refCounter = RWops_RWRefCounter_new(internal->rw); |
| 127 if (refCounter == NULL) | |
| 128 { | |
| 129 _D(("MP3: Failed to create reference counting RWops.\n")); | |
| 130 return(0); | |
| 131 } /* if */ | |
| 132 | |
| 133 /* replace original RWops. This is safe. Honest. :) */ | |
| 134 internal->rw = refCounter; | |
| 135 | |
| 136 /* | |
| 137 * increment the refcount, since SMPEG will nuke the RWops if it can't | |
| 138 * accept the contained data... | |
| 139 */ | |
| 140 RWops_RWRefCounter_addRef(refCounter); | |
| 141 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0); | |
| 142 | |
| 143 if (SMPEG_error(smpeg)) | |
| 144 { | |
| 145 Sound_SetError(SMPEG_error(smpeg)); | |
| 146 SMPEG_delete(smpeg); | |
| 147 return(0); | |
| 148 } /* if */ | |
| 149 | |
| 150 if (!smpeg_info.has_audio) | |
| 151 { | |
| 152 Sound_SetError("MP3: No audio stream found in data."); | |
| 153 SMPEG_delete(smpeg); | |
| 154 return(0); | |
| 155 } /* if */ | |
| 156 | |
| 157 _D(("MP3: Accepting data stream.\n")); | |
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158 _D(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE")); |
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159 _D(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE")); |
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160 _D(("MP3: width == (%d).\n", smpeg_info.width)); |
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161 _D(("MP3: height == (%d).\n", smpeg_info.height)); |
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162 _D(("MP3: current_frame == (%d).\n", smpeg_info.current_frame)); |
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163 _D(("MP3: current_fps == (%f).\n", smpeg_info.current_fps)); |
| 14 | 164 _D(("MP3: audio_string == [%s].\n", smpeg_info.audio_string)); |
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165 _D(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame)); |
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166 _D(("MP3: current_offset == (%d).\n", smpeg_info.current_offset)); |
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167 _D(("MP3: total_size == (%d).\n", smpeg_info.total_size)); |
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168 _D(("MP3: current_time == (%f).\n", smpeg_info.current_time)); |
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169 _D(("MP3: total_time == (%f).\n", smpeg_info.total_time)); |
| 14 | 170 |
| 171 SMPEG_enablevideo(smpeg, 0); | |
| 172 SMPEG_enableaudio(smpeg, 1); | |
| 173 SMPEG_loop(smpeg, 0); | |
| 174 | |
| 175 SMPEG_wantedSpec(smpeg, &spec); | |
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176 /* |
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177 * One of the MP3:s I tried wouldn't work unless I added this line |
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178 * to tell SMPEG that yes, it may have the spec it wants. |
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179 */ |
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180 SMPEG_actualSpec(smpeg, &spec); |
| 14 | 181 sample->actual.format = spec.format; |
| 182 sample->actual.rate = spec.freq; | |
| 183 sample->actual.channels = spec.channels; | |
| 184 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 185 internal->decoder_private = smpeg; | |
| 186 | |
| 187 SMPEG_play(smpeg); | |
| 188 return(1); | |
| 189 } /* MP3_open */ | |
| 190 | |
| 191 | |
| 192 static void MP3_close(Sound_Sample *sample) | |
| 193 { | |
| 194 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 195 SMPEG_delete((SMPEG *) internal->decoder_private); | |
| 196 } /* MP3_close */ | |
| 197 | |
| 198 | |
| 199 static Uint32 MP3_read(Sound_Sample *sample) | |
| 200 { | |
| 201 Uint32 retval; | |
| 202 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 203 SMPEG *smpeg = (SMPEG *) internal->decoder_private; | |
| 204 | |
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205 /* |
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206 * We have to clear the buffer because apparently SMPEG_playAudio() |
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207 * will mix the decoded audio with whatever's already in it. Nasty. |
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208 */ |
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209 memset(internal->buffer, 0, internal->buffer_size); |
| 14 | 210 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size); |
| 211 if (retval < internal->buffer_size) | |
| 212 { | |
| 213 char *errMsg = SMPEG_error(smpeg); | |
| 214 if (errMsg == NULL) | |
| 215 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 216 else | |
| 217 { | |
| 218 Sound_SetError(errMsg); | |
| 219 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 220 } /* else */ | |
| 221 } /* if */ | |
| 222 | |
| 223 return(retval); | |
| 224 } /* MP3_read */ | |
| 225 | |
| 226 /* end of mp3.c ... */ | |
| 227 |