Mercurial > SDL_sound_CoreAudio
annotate decoders/mp3.c @ 38:9950943545c4
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Thu, 20 Sep 2001 07:56:52 +0000 |
| parents | d9e84e857569 |
| children | 6e13fcc178da |
| 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 | |
| 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 | |
| 62 MP3_open, /* open() method */ | |
| 63 MP3_close, /* close() method */ | |
| 64 MP3_read /* read() method */ | |
| 65 }; | |
| 66 | |
| 67 static __inline__ void output_version(void) | |
| 68 { | |
| 69 static int first_time = 1; | |
| 70 | |
| 71 if (first_time) | |
| 72 { | |
| 73 SMPEG_version v; | |
| 74 SMPEG_VERSION(&v); | |
| 75 _D(("MP3: Compiled against SMPEG v%d.%d.%d.\n", | |
| 76 v.major, v.minor, v.patch)); | |
| 77 first_time = 0; | |
| 78 } /* if */ | |
| 79 } /* output_version */ | |
| 80 | |
| 81 | |
| 82 static int MP3_open(Sound_Sample *sample, const char *ext) | |
| 83 { | |
| 84 SMPEG *smpeg; | |
| 85 SMPEG_Info smpeg_info; | |
| 86 SDL_AudioSpec spec; | |
| 87 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 88 SDL_RWops *refCounter; | |
| 89 | |
| 90 output_version(); | |
| 91 | |
| 92 refCounter = RWops_RWRefCounter_new(internal->rw); | |
| 93 if (refCounter == NULL) | |
| 94 { | |
| 95 _D(("MP3: Failed to create reference counting RWops.\n")); | |
| 96 return(0); | |
| 97 } /* if */ | |
| 98 | |
| 99 /* replace original RWops. This is safe. Honest. :) */ | |
| 100 internal->rw = refCounter; | |
| 101 | |
| 102 /* | |
| 103 * increment the refcount, since SMPEG will nuke the RWops if it can't | |
| 104 * accept the contained data... | |
| 105 */ | |
| 106 RWops_RWRefCounter_addRef(refCounter); | |
| 107 smpeg = SMPEG_new_rwops(refCounter, &smpeg_info, 0); | |
| 108 | |
| 109 if (SMPEG_error(smpeg)) | |
| 110 { | |
| 111 Sound_SetError(SMPEG_error(smpeg)); | |
| 112 SMPEG_delete(smpeg); | |
| 113 return(0); | |
| 114 } /* if */ | |
| 115 | |
| 116 if (!smpeg_info.has_audio) | |
| 117 { | |
| 118 Sound_SetError("MP3: No audio stream found in data."); | |
| 119 SMPEG_delete(smpeg); | |
| 120 return(0); | |
| 121 } /* if */ | |
| 122 | |
| 123 _D(("MP3: Accepting data stream.\n")); | |
|
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parents:
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124 _D(("MP3: has_audio == {%s}.\n", smpeg_info.has_audio ? "TRUE" : "FALSE")); |
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parents:
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diff
changeset
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125 _D(("MP3: has_video == {%s}.\n", smpeg_info.has_video ? "TRUE" : "FALSE")); |
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parents:
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diff
changeset
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126 _D(("MP3: width == (%d).\n", smpeg_info.width)); |
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parents:
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127 _D(("MP3: height == (%d).\n", smpeg_info.height)); |
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d9e84e857569
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parents:
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128 _D(("MP3: current_frame == (%d).\n", smpeg_info.current_frame)); |
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parents:
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129 _D(("MP3: current_fps == (%f).\n", smpeg_info.current_fps)); |
| 14 | 130 _D(("MP3: audio_string == [%s].\n", smpeg_info.audio_string)); |
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parents:
14
diff
changeset
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131 _D(("MP3: audio_current_frame == (%d).\n", smpeg_info.audio_current_frame)); |
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d9e84e857569
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parents:
14
diff
changeset
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132 _D(("MP3: current_offset == (%d).\n", smpeg_info.current_offset)); |
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d9e84e857569
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parents:
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diff
changeset
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133 _D(("MP3: total_size == (%d).\n", smpeg_info.total_size)); |
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d9e84e857569
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parents:
14
diff
changeset
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134 _D(("MP3: current_time == (%f).\n", smpeg_info.current_time)); |
|
d9e84e857569
Changed some debug output. Still broken.
Ryan C. Gordon <icculus@icculus.org>
parents:
14
diff
changeset
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135 _D(("MP3: total_time == (%f).\n", smpeg_info.total_time)); |
| 14 | 136 |
| 137 SMPEG_enablevideo(smpeg, 0); | |
| 138 SMPEG_enableaudio(smpeg, 1); | |
| 139 SMPEG_loop(smpeg, 0); | |
| 140 | |
| 141 SMPEG_wantedSpec(smpeg, &spec); | |
| 142 sample->actual.format = spec.format; | |
| 143 sample->actual.rate = spec.freq; | |
| 144 sample->actual.channels = spec.channels; | |
| 145 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 146 internal->decoder_private = smpeg; | |
| 147 | |
| 148 SMPEG_play(smpeg); | |
| 149 return(1); | |
| 150 } /* MP3_open */ | |
| 151 | |
| 152 | |
| 153 static void MP3_close(Sound_Sample *sample) | |
| 154 { | |
| 155 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 156 SMPEG_delete((SMPEG *) internal->decoder_private); | |
| 157 } /* MP3_close */ | |
| 158 | |
| 159 | |
| 160 static Uint32 MP3_read(Sound_Sample *sample) | |
| 161 { | |
| 162 Uint32 retval; | |
| 163 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 164 SMPEG *smpeg = (SMPEG *) internal->decoder_private; | |
| 165 | |
| 166 retval = SMPEG_playAudio(smpeg, internal->buffer, internal->buffer_size); | |
| 167 if (retval < internal->buffer_size) | |
| 168 { | |
| 169 char *errMsg = SMPEG_error(smpeg); | |
| 170 if (errMsg == NULL) | |
| 171 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 172 else | |
| 173 { | |
| 174 Sound_SetError(errMsg); | |
| 175 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 176 } /* else */ | |
| 177 } /* if */ | |
| 178 | |
| 179 return(retval); | |
| 180 } /* MP3_read */ | |
| 181 | |
| 182 /* end of mp3.c ... */ | |
| 183 |