Mercurial > SDL_sound_CoreAudio
annotate decoders/ogg.c @ 117:9778eba22813
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 05 Oct 2001 14:04:53 +0000 |
| parents | 40de367eb59e |
| children | 095a066b2cd2 |
| rev | line source |
|---|---|
| 24 | 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 * Ogg Vorbis decoder for SDL_sound. | |
| 22 * | |
| 23 * This driver handles .OGG audio files, and depends on libvorbisfile to | |
| 24 * do the actual decoding work. libvorbisfile is part of libvorbis, which | |
| 25 * is part of the Ogg Vorbis project. | |
| 26 * | |
| 27 * Ogg Vorbis: http://www.xiph.org/ogg/vorbis/ | |
| 28 * vorbisfile documentation: http://www.xiph.org/ogg/vorbis/doc/vorbisfile/ | |
| 29 * | |
| 30 * Please see the file LICENSE in the source's root directory. | |
| 31 * | |
| 32 * This file written by Ryan C. Gordon. (icculus@clutteredmind.org) | |
| 33 */ | |
| 34 | |
|
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35 #if HAVE_CONFIG_H |
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36 # include <config.h> |
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37 #endif |
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38 |
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39 #ifdef SOUND_SUPPORTS_OGG |
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40 |
| 24 | 41 #include <stdio.h> |
| 42 #include <stdlib.h> | |
| 43 #include <string.h> | |
| 44 #include <math.h> | |
| 45 #include <assert.h> | |
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46 |
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47 #include "SDL_sound.h" |
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48 |
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49 #define __SDL_SOUND_INTERNAL__ |
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50 #include "SDL_sound_internal.h" |
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51 |
| 24 | 52 #include "vorbis/codec.h" |
| 53 #include "vorbis/vorbisfile.h" | |
| 54 | |
| 55 | |
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56 static int OGG_init(void); |
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57 static void OGG_quit(void); |
| 24 | 58 static int OGG_open(Sound_Sample *sample, const char *ext); |
| 59 static void OGG_close(Sound_Sample *sample); | |
| 60 static Uint32 OGG_read(Sound_Sample *sample); | |
| 61 | |
| 62 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG = | |
| 63 { | |
| 64 { | |
| 65 "OGG", | |
| 66 "Ogg Vorbis audio through VorbisFile", | |
| 67 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 68 "http://www.icculus.org/SDL_sound/" | |
| 69 }, | |
| 70 | |
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71 OGG_init, /* init() method */ |
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72 OGG_quit, /* quit() method */ |
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73 OGG_open, /* open() method */ |
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74 OGG_close, /* close() method */ |
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75 OGG_read /* read() method */ |
| 24 | 76 }; |
| 77 | |
| 78 | |
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79 static int OGG_init(void) |
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80 { |
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81 return(1); /* always succeeds. */ |
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82 } /* OGG_init */ |
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83 |
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84 |
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85 static void OGG_quit(void) |
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86 { |
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87 /* it's a no-op. */ |
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88 } /* OGG_quit */ |
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89 |
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90 |
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91 |
| 24 | 92 /* |
| 93 * These are callbacks from vorbisfile that let them read data from | |
| 94 * a RWops... | |
| 95 */ | |
| 96 | |
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97 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) |
| 24 | 98 { |
| 99 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb)); | |
| 100 } /* RWops_ogg_read */ | |
| 101 | |
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102 static int RWops_ogg_seek(void *datasource, int64_t offset, int whence) |
| 24 | 103 { |
| 104 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence)); | |
| 105 } /* RWops_ogg_seek */ | |
| 106 | |
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107 static int RWops_ogg_close(void *datasource) |
| 24 | 108 { |
| 109 /* do nothing; SDL_sound will delete the RWops at a higher level. */ | |
| 110 return(0); /* this is success in fclose(), so I guess that's okay. */ | |
| 111 } /* RWops_ogg_close */ | |
| 112 | |
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113 static long RWops_ogg_tell(void *datasource) |
| 24 | 114 { |
| 115 return((long) SDL_RWtell((SDL_RWops *) datasource)); | |
| 116 } /* RWops_ogg_tell */ | |
| 117 | |
| 118 static const ov_callbacks RWops_ogg_callbacks = | |
| 119 { | |
| 120 RWops_ogg_read, | |
| 121 RWops_ogg_seek, | |
| 122 RWops_ogg_close, | |
| 123 RWops_ogg_tell | |
| 124 }; | |
| 125 | |
| 126 | |
| 127 /* Return a human readable version of an VorbisFile error code... */ | |
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128 #if (defined DEBUG_CHATTER) |
| 24 | 129 static const char *ogg_error(int errnum) |
| 130 { | |
| 131 switch(errnum) | |
| 132 { | |
| 133 case OV_EREAD: | |
| 134 return("i/o error"); | |
| 135 case OV_ENOTVORBIS: | |
| 136 return("not a vorbis file"); | |
| 137 case OV_EVERSION: | |
| 138 return("Vorbis version mismatch"); | |
| 139 case OV_EBADHEADER: | |
| 140 return("invalid Vorbis bitstream header"); | |
| 141 case OV_EFAULT: | |
| 142 return("internal logic fault in Vorbis library"); | |
| 143 } /* switch */ | |
| 144 | |
| 145 return("unknown error"); | |
| 146 } /* ogg_error */ | |
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147 #endif |
| 24 | 148 |
| 149 static __inline__ void output_ogg_comments(OggVorbis_File *vf) | |
| 150 { | |
| 151 #if (defined DEBUG_CHATTER) | |
| 152 int i; | |
| 153 vorbis_comment *vc = ov_comment(vf, -1); | |
| 154 | |
| 155 if (vc == NULL) | |
| 156 return; | |
| 157 | |
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158 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor)); |
| 24 | 159 for (i = 0; i < vc->comments; i++) |
| 160 { | |
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161 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i])); |
| 24 | 162 } /* for */ |
| 163 #endif | |
| 164 } /* output_ogg_comments */ | |
| 165 | |
| 166 | |
| 167 static int OGG_open(Sound_Sample *sample, const char *ext) | |
| 168 { | |
| 169 int rc; | |
| 170 OggVorbis_File *vf; | |
| 171 vorbis_info *info; | |
| 172 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 173 | |
| 174 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File)); | |
| 175 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 176 | |
| 177 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks); | |
| 178 if (rc != 0) | |
| 179 { | |
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180 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc))); |
| 24 | 181 free(vf); |
| 182 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0); | |
| 183 } /* if */ | |
| 184 | |
| 185 info = ov_info(vf, -1); | |
| 186 if (info == NULL) | |
| 187 { | |
| 188 ov_clear(vf); | |
| 189 free(vf); | |
| 190 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0); | |
| 191 } /* if */ | |
| 192 | |
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193 SNDDBG(("OGG: Accepting data stream.\n")); |
| 24 | 194 |
| 195 output_ogg_comments(vf); | |
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196 SNDDBG(("OGG: bitstream version == (%d).\n", info->version)); |
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197 SNDDBG(("OGG: bitstream channels == (%d).\n", info->channels)); |
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198 SNDDBG(("OGG: bitstream sampling rate == (%ld).\n", info->rate)); |
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199 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE")); |
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200 SNDDBG(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf))); |
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201 SNDDBG(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1))); |
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202 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1))); |
| 24 | 203 |
| 204 internal->decoder_private = vf; | |
| 205 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 206 sample->actual.rate = (Uint32) info->rate; | |
| 207 sample->actual.channels = (Uint8) info->channels; | |
| 208 | |
| 209 /* | |
| 210 * Since we might have more than one logical bitstream in the OGG file, | |
| 211 * and these bitstreams may be in different formats, we might be | |
| 212 * converting two or three times: once in vorbisfile, once again in | |
| 213 * SDL_sound, and perhaps a third time to get it to the sound device's | |
| 214 * format. That's wickedly inefficient. | |
| 215 * | |
| 216 * To combat this a little, if the user specified a desired format, we | |
| 217 * claim that to be the "actual" format of the collection of logical | |
| 218 * bitstreams. This means that VorbisFile will do a conversion as | |
| 219 * necessary, and SDL_sound will not. If the user didn't specify a | |
| 220 * desired format, then we pretend the "actual" format is something that | |
| 221 * OGG files are apparently commonly encoded in. | |
| 222 */ | |
| 223 sample->actual.format = (sample->desired.format == 0) ? | |
| 224 AUDIO_S16LSB : sample->desired.format; | |
| 225 return(1); | |
| 226 } /* OGG_open */ | |
| 227 | |
| 228 | |
| 229 static void OGG_close(Sound_Sample *sample) | |
| 230 { | |
| 231 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 232 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 233 ov_clear(vf); | |
| 234 free(vf); | |
| 235 } /* OGG_close */ | |
| 236 | |
| 237 | |
| 238 static Uint32 OGG_read(Sound_Sample *sample) | |
| 239 { | |
| 240 int rc; | |
| 241 int bitstream; | |
| 242 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 243 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 244 | |
| 245 rc = ov_read(vf, internal->buffer, internal->buffer_size, | |
| 246 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */ | |
| 247 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */ | |
| 248 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */ | |
| 249 &bitstream); | |
| 250 | |
| 251 /* Make sure the read went smoothly... */ | |
| 252 if (rc == 0) | |
| 253 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 254 | |
| 255 else if (rc < 0) | |
| 256 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 257 | |
| 258 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 259 else if ((Uint32) rc < internal->buffer_size) | |
| 260 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 261 | |
| 262 return((Uint32) rc); | |
| 263 } /* OGG_read */ | |
| 264 | |
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265 #endif /* SOUND_SUPPORTS_OGG */ |
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266 |
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267 |
| 24 | 268 /* end of ogg.c ... */ |
| 269 |