Mercurial > SDL_sound_CoreAudio
annotate decoders/ogg.c @ 355:5dbf2f9cde00
Added docs stuff.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Fri, 07 Jun 2002 13:26:13 +0000 |
| parents | aa7f6a110971 |
| children | cbb15ecf423a |
| 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 * | |
|
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30 * Please see the file COPYING in the source's root directory. |
| 24 | 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); | |
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61 static int OGG_rewind(Sound_Sample *sample); |
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62 static int OGG_seek(Sound_Sample *sample, Uint32 ms); |
| 24 | 63 |
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64 static const char *extensions_ogg[] = { "OGG", NULL }; |
| 24 | 65 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG = |
| 66 { | |
| 67 { | |
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68 extensions_ogg, |
| 24 | 69 "Ogg Vorbis audio through VorbisFile", |
| 70 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 71 "http://www.icculus.org/SDL_sound/" | |
| 72 }, | |
| 73 | |
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74 OGG_init, /* init() method */ |
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75 OGG_quit, /* quit() method */ |
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76 OGG_open, /* open() method */ |
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77 OGG_close, /* close() method */ |
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78 OGG_read, /* read() method */ |
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79 OGG_rewind, /* rewind() method */ |
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80 OGG_seek /* seek() method */ |
| 24 | 81 }; |
| 82 | |
| 83 | |
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84 static int OGG_init(void) |
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85 { |
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86 return(1); /* always succeeds. */ |
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87 } /* OGG_init */ |
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88 |
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89 |
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90 static void OGG_quit(void) |
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91 { |
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92 /* it's a no-op. */ |
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93 } /* OGG_quit */ |
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94 |
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95 |
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96 |
| 24 | 97 /* |
| 98 * These are callbacks from vorbisfile that let them read data from | |
| 99 * a RWops... | |
| 100 */ | |
| 101 | |
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102 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) |
| 24 | 103 { |
| 104 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb)); | |
| 105 } /* RWops_ogg_read */ | |
| 106 | |
| 122 | 107 static int RWops_ogg_seek(void *datasource, ogg_int64_t offset, int whence) |
| 24 | 108 { |
| 109 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence)); | |
| 110 } /* RWops_ogg_seek */ | |
| 111 | |
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112 static int RWops_ogg_close(void *datasource) |
| 24 | 113 { |
| 114 /* do nothing; SDL_sound will delete the RWops at a higher level. */ | |
| 115 return(0); /* this is success in fclose(), so I guess that's okay. */ | |
| 116 } /* RWops_ogg_close */ | |
| 117 | |
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118 static long RWops_ogg_tell(void *datasource) |
| 24 | 119 { |
| 120 return((long) SDL_RWtell((SDL_RWops *) datasource)); | |
| 121 } /* RWops_ogg_tell */ | |
| 122 | |
| 123 static const ov_callbacks RWops_ogg_callbacks = | |
| 124 { | |
| 125 RWops_ogg_read, | |
| 126 RWops_ogg_seek, | |
| 127 RWops_ogg_close, | |
| 128 RWops_ogg_tell | |
| 129 }; | |
| 130 | |
| 131 | |
| 132 /* Return a human readable version of an VorbisFile error code... */ | |
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133 #if (defined DEBUG_CHATTER) |
| 24 | 134 static const char *ogg_error(int errnum) |
| 135 { | |
| 136 switch(errnum) | |
| 137 { | |
| 138 case OV_EREAD: | |
| 139 return("i/o error"); | |
| 140 case OV_ENOTVORBIS: | |
| 141 return("not a vorbis file"); | |
| 142 case OV_EVERSION: | |
| 143 return("Vorbis version mismatch"); | |
| 144 case OV_EBADHEADER: | |
| 145 return("invalid Vorbis bitstream header"); | |
| 146 case OV_EFAULT: | |
| 147 return("internal logic fault in Vorbis library"); | |
| 148 } /* switch */ | |
| 149 | |
| 150 return("unknown error"); | |
| 151 } /* ogg_error */ | |
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152 #endif |
| 24 | 153 |
| 154 static __inline__ void output_ogg_comments(OggVorbis_File *vf) | |
| 155 { | |
| 156 #if (defined DEBUG_CHATTER) | |
| 157 int i; | |
| 158 vorbis_comment *vc = ov_comment(vf, -1); | |
| 159 | |
| 160 if (vc == NULL) | |
| 161 return; | |
| 162 | |
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163 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor)); |
| 24 | 164 for (i = 0; i < vc->comments; i++) |
| 165 { | |
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166 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i])); |
| 24 | 167 } /* for */ |
| 168 #endif | |
| 169 } /* output_ogg_comments */ | |
| 170 | |
| 171 | |
| 172 static int OGG_open(Sound_Sample *sample, const char *ext) | |
| 173 { | |
| 174 int rc; | |
| 175 OggVorbis_File *vf; | |
| 176 vorbis_info *info; | |
| 177 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 178 | |
| 179 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File)); | |
| 180 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 181 | |
| 182 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks); | |
| 183 if (rc != 0) | |
| 184 { | |
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185 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc))); |
| 24 | 186 free(vf); |
| 187 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0); | |
| 188 } /* if */ | |
| 189 | |
| 190 info = ov_info(vf, -1); | |
| 191 if (info == NULL) | |
| 192 { | |
| 193 ov_clear(vf); | |
| 194 free(vf); | |
| 195 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0); | |
| 196 } /* if */ | |
| 197 | |
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198 SNDDBG(("OGG: Accepting data stream.\n")); |
| 24 | 199 |
| 200 output_ogg_comments(vf); | |
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201 SNDDBG(("OGG: bitstream version == (%d).\n", info->version)); |
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202 SNDDBG(("OGG: bitstream channels == (%d).\n", info->channels)); |
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203 SNDDBG(("OGG: bitstream sampling rate == (%ld).\n", info->rate)); |
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204 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE")); |
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205 SNDDBG(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf))); |
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206 SNDDBG(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1))); |
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207 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1))); |
| 24 | 208 |
| 209 internal->decoder_private = vf; | |
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210 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
| 24 | 211 sample->actual.rate = (Uint32) info->rate; |
| 212 sample->actual.channels = (Uint8) info->channels; | |
| 213 | |
| 214 /* | |
| 215 * Since we might have more than one logical bitstream in the OGG file, | |
| 216 * and these bitstreams may be in different formats, we might be | |
| 217 * converting two or three times: once in vorbisfile, once again in | |
| 218 * SDL_sound, and perhaps a third time to get it to the sound device's | |
| 219 * format. That's wickedly inefficient. | |
| 220 * | |
| 221 * To combat this a little, if the user specified a desired format, we | |
| 222 * claim that to be the "actual" format of the collection of logical | |
| 223 * bitstreams. This means that VorbisFile will do a conversion as | |
| 224 * necessary, and SDL_sound will not. If the user didn't specify a | |
| 225 * desired format, then we pretend the "actual" format is something that | |
| 226 * OGG files are apparently commonly encoded in. | |
| 227 */ | |
| 228 sample->actual.format = (sample->desired.format == 0) ? | |
| 229 AUDIO_S16LSB : sample->desired.format; | |
| 230 return(1); | |
| 231 } /* OGG_open */ | |
| 232 | |
| 233 | |
| 234 static void OGG_close(Sound_Sample *sample) | |
| 235 { | |
| 236 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 237 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 238 ov_clear(vf); | |
| 239 free(vf); | |
| 240 } /* OGG_close */ | |
| 241 | |
| 242 | |
| 243 static Uint32 OGG_read(Sound_Sample *sample) | |
| 244 { | |
| 245 int rc; | |
| 246 int bitstream; | |
| 247 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 248 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 249 | |
| 250 rc = ov_read(vf, internal->buffer, internal->buffer_size, | |
| 251 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */ | |
| 252 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */ | |
| 253 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */ | |
| 254 &bitstream); | |
| 255 | |
| 256 /* Make sure the read went smoothly... */ | |
| 257 if (rc == 0) | |
| 258 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 259 | |
| 260 else if (rc < 0) | |
| 261 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 262 | |
| 263 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 264 else if ((Uint32) rc < internal->buffer_size) | |
| 265 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 266 | |
| 267 return((Uint32) rc); | |
| 268 } /* OGG_read */ | |
| 269 | |
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270 |
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271 static int OGG_rewind(Sound_Sample *sample) |
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272 { |
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273 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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274 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; |
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275 |
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276 BAIL_IF_MACRO(ov_raw_seek(vf, 0) < 0, ERR_IO_ERROR, 0); |
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277 return(1); |
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278 } /* OGG_rewind */ |
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279 |
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280 |
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281 static int OGG_seek(Sound_Sample *sample, Uint32 ms) |
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282 { |
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283 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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284 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; |
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285 double timepos = (((double) ms) / 1000.0); |
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286 BAIL_IF_MACRO(ov_time_seek(vf, timepos) < 0, ERR_IO_ERROR, 0); |
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287 return(1); |
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288 } /* OGG_seek */ |
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289 |
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290 #endif /* SOUND_SUPPORTS_OGG */ |
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291 |
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292 |
| 24 | 293 /* end of ogg.c ... */ |
| 294 |