Mercurial > SDL_sound_CoreAudio
annotate decoders/ogg.c @ 95:4436f4587c9a
Updated.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Tue, 02 Oct 2001 17:23:08 +0000 |
| parents | 9669aa13d3e0 |
| children | 6d9fdec2f708 |
| 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 #ifdef SOUND_SUPPORTS_OGG |
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36 |
| 24 | 37 #include <stdio.h> |
| 38 #include <stdlib.h> | |
| 39 #include <string.h> | |
| 40 #include <math.h> | |
| 41 #include <assert.h> | |
| 42 #include "vorbis/codec.h" | |
| 43 #include "vorbis/vorbisfile.h" | |
| 44 | |
| 45 #include "SDL_sound.h" | |
| 46 | |
| 47 #define __SDL_SOUND_INTERNAL__ | |
| 48 #include "SDL_sound_internal.h" | |
| 49 | |
|
47
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50 static int OGG_init(void); |
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51 static void OGG_quit(void); |
| 24 | 52 static int OGG_open(Sound_Sample *sample, const char *ext); |
| 53 static void OGG_close(Sound_Sample *sample); | |
| 54 static Uint32 OGG_read(Sound_Sample *sample); | |
| 55 | |
| 56 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG = | |
| 57 { | |
| 58 { | |
| 59 "OGG", | |
| 60 "Ogg Vorbis audio through VorbisFile", | |
| 61 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 62 "http://www.icculus.org/SDL_sound/" | |
| 63 }, | |
| 64 | |
|
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65 OGG_init, /* init() method */ |
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66 OGG_quit, /* quit() method */ |
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67 OGG_open, /* open() method */ |
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68 OGG_close, /* close() method */ |
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69 OGG_read /* read() method */ |
| 24 | 70 }; |
| 71 | |
| 72 | |
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73 static int OGG_init(void) |
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74 { |
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75 return(1); /* always succeeds. */ |
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76 } /* OGG_init */ |
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77 |
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78 |
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79 static void OGG_quit(void) |
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80 { |
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81 /* it's a no-op. */ |
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82 } /* OGG_quit */ |
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83 |
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84 |
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85 |
| 24 | 86 /* |
| 87 * These are callbacks from vorbisfile that let them read data from | |
| 88 * a RWops... | |
| 89 */ | |
| 90 | |
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91 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) |
| 24 | 92 { |
| 93 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb)); | |
| 94 } /* RWops_ogg_read */ | |
| 95 | |
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96 static int RWops_ogg_seek(void *datasource, int64_t offset, int whence) |
| 24 | 97 { |
| 98 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence)); | |
| 99 } /* RWops_ogg_seek */ | |
| 100 | |
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101 static int RWops_ogg_close(void *datasource) |
| 24 | 102 { |
| 103 /* do nothing; SDL_sound will delete the RWops at a higher level. */ | |
| 104 return(0); /* this is success in fclose(), so I guess that's okay. */ | |
| 105 } /* RWops_ogg_close */ | |
| 106 | |
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107 static long RWops_ogg_tell(void *datasource) |
| 24 | 108 { |
| 109 return((long) SDL_RWtell((SDL_RWops *) datasource)); | |
| 110 } /* RWops_ogg_tell */ | |
| 111 | |
| 112 static const ov_callbacks RWops_ogg_callbacks = | |
| 113 { | |
| 114 RWops_ogg_read, | |
| 115 RWops_ogg_seek, | |
| 116 RWops_ogg_close, | |
| 117 RWops_ogg_tell | |
| 118 }; | |
| 119 | |
| 120 | |
| 121 /* Return a human readable version of an VorbisFile error code... */ | |
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122 #if (defined DEBUG_CHATTER) |
| 24 | 123 static const char *ogg_error(int errnum) |
| 124 { | |
| 125 switch(errnum) | |
| 126 { | |
| 127 case OV_EREAD: | |
| 128 return("i/o error"); | |
| 129 case OV_ENOTVORBIS: | |
| 130 return("not a vorbis file"); | |
| 131 case OV_EVERSION: | |
| 132 return("Vorbis version mismatch"); | |
| 133 case OV_EBADHEADER: | |
| 134 return("invalid Vorbis bitstream header"); | |
| 135 case OV_EFAULT: | |
| 136 return("internal logic fault in Vorbis library"); | |
| 137 } /* switch */ | |
| 138 | |
| 139 return("unknown error"); | |
| 140 } /* ogg_error */ | |
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141 #endif |
| 24 | 142 |
| 143 static __inline__ void output_ogg_comments(OggVorbis_File *vf) | |
| 144 { | |
| 145 #if (defined DEBUG_CHATTER) | |
| 146 int i; | |
| 147 vorbis_comment *vc = ov_comment(vf, -1); | |
| 148 | |
| 149 if (vc == NULL) | |
| 150 return; | |
| 151 | |
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152 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor)); |
| 24 | 153 for (i = 0; i < vc->comments; i++) |
| 154 { | |
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155 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i])); |
| 24 | 156 } /* for */ |
| 157 #endif | |
| 158 } /* output_ogg_comments */ | |
| 159 | |
| 160 | |
| 161 static int OGG_open(Sound_Sample *sample, const char *ext) | |
| 162 { | |
| 163 int rc; | |
| 164 OggVorbis_File *vf; | |
| 165 vorbis_info *info; | |
| 166 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 167 | |
| 168 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File)); | |
| 169 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 170 | |
| 171 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks); | |
| 172 if (rc != 0) | |
| 173 { | |
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174 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc))); |
| 24 | 175 free(vf); |
| 176 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0); | |
| 177 } /* if */ | |
| 178 | |
| 179 info = ov_info(vf, -1); | |
| 180 if (info == NULL) | |
| 181 { | |
| 182 ov_clear(vf); | |
| 183 free(vf); | |
| 184 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0); | |
| 185 } /* if */ | |
| 186 | |
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187 SNDDBG(("OGG: Accepting data stream.\n")); |
| 24 | 188 |
| 189 output_ogg_comments(vf); | |
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190 SNDDBG(("OGG: bitstream version == (%d).\n", info->version)); |
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191 SNDDBG(("OGG: bitstream channels == (%d).\n", info->channels)); |
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192 SNDDBG(("OGG: bitstream sampling rate == (%ld).\n", info->rate)); |
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193 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE")); |
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194 SNDDBG(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf))); |
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195 SNDDBG(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1))); |
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196 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1))); |
| 24 | 197 |
| 198 internal->decoder_private = vf; | |
| 199 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 200 sample->actual.rate = (Uint32) info->rate; | |
| 201 sample->actual.channels = (Uint8) info->channels; | |
| 202 | |
| 203 /* | |
| 204 * Since we might have more than one logical bitstream in the OGG file, | |
| 205 * and these bitstreams may be in different formats, we might be | |
| 206 * converting two or three times: once in vorbisfile, once again in | |
| 207 * SDL_sound, and perhaps a third time to get it to the sound device's | |
| 208 * format. That's wickedly inefficient. | |
| 209 * | |
| 210 * To combat this a little, if the user specified a desired format, we | |
| 211 * claim that to be the "actual" format of the collection of logical | |
| 212 * bitstreams. This means that VorbisFile will do a conversion as | |
| 213 * necessary, and SDL_sound will not. If the user didn't specify a | |
| 214 * desired format, then we pretend the "actual" format is something that | |
| 215 * OGG files are apparently commonly encoded in. | |
| 216 */ | |
| 217 sample->actual.format = (sample->desired.format == 0) ? | |
| 218 AUDIO_S16LSB : sample->desired.format; | |
| 219 return(1); | |
| 220 } /* OGG_open */ | |
| 221 | |
| 222 | |
| 223 static void OGG_close(Sound_Sample *sample) | |
| 224 { | |
| 225 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 226 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 227 ov_clear(vf); | |
| 228 free(vf); | |
| 229 } /* OGG_close */ | |
| 230 | |
| 231 | |
| 232 static Uint32 OGG_read(Sound_Sample *sample) | |
| 233 { | |
| 234 int rc; | |
| 235 int bitstream; | |
| 236 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 237 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 238 | |
| 239 rc = ov_read(vf, internal->buffer, internal->buffer_size, | |
| 240 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */ | |
| 241 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */ | |
| 242 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */ | |
| 243 &bitstream); | |
| 244 | |
| 245 /* Make sure the read went smoothly... */ | |
| 246 if (rc == 0) | |
| 247 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 248 | |
| 249 else if (rc < 0) | |
| 250 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 251 | |
| 252 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 253 else if ((Uint32) rc < internal->buffer_size) | |
| 254 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 255 | |
| 256 return((Uint32) rc); | |
| 257 } /* OGG_read */ | |
| 258 | |
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259 #endif /* SOUND_SUPPORTS_OGG */ |
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260 |
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261 |
| 24 | 262 /* end of ogg.c ... */ |
| 263 |