Mercurial > SDL_sound_CoreAudio
annotate decoders/ogg.c @ 47:ea58bc3b15d7
Added init() and quit() methods.
| author | Ryan C. Gordon <icculus@icculus.org> |
|---|---|
| date | Sat, 22 Sep 2001 14:41:38 +0000 |
| parents | 0fc0f91b1b84 |
| children | cd91e1857b42 |
| 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 | |
| 35 #include <stdio.h> | |
| 36 #include <stdlib.h> | |
| 37 #include <string.h> | |
| 38 #include <math.h> | |
| 39 #include <assert.h> | |
| 40 #include "vorbis/codec.h" | |
| 41 #include "vorbis/vorbisfile.h" | |
| 42 | |
| 43 #include "SDL_sound.h" | |
| 44 | |
| 45 #define __SDL_SOUND_INTERNAL__ | |
| 46 #include "SDL_sound_internal.h" | |
| 47 | |
| 48 #if (!defined SOUND_SUPPORTS_OGG) | |
| 49 #error SOUND_SUPPORTS_OGG must be defined. | |
| 50 #endif | |
| 51 | |
|
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52 static int OGG_init(void); |
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53 static void OGG_quit(void); |
| 24 | 54 static int OGG_open(Sound_Sample *sample, const char *ext); |
| 55 static void OGG_close(Sound_Sample *sample); | |
| 56 static Uint32 OGG_read(Sound_Sample *sample); | |
| 57 | |
| 58 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG = | |
| 59 { | |
| 60 { | |
| 61 "OGG", | |
| 62 "Ogg Vorbis audio through VorbisFile", | |
| 63 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
| 64 "http://www.icculus.org/SDL_sound/" | |
| 65 }, | |
| 66 | |
|
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67 OGG_init, /* init() method */ |
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68 OGG_quit, /* quit() method */ |
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69 OGG_open, /* open() method */ |
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70 OGG_close, /* close() method */ |
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71 OGG_read /* read() method */ |
| 24 | 72 }; |
| 73 | |
| 74 | |
|
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75 static int OGG_init(void) |
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76 { |
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77 return(1); /* always succeeds. */ |
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78 } /* OGG_init */ |
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79 |
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80 |
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81 static void OGG_quit(void) |
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82 { |
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83 /* it's a no-op. */ |
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84 } /* OGG_quit */ |
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85 |
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86 |
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87 |
| 24 | 88 /* |
| 89 * These are callbacks from vorbisfile that let them read data from | |
| 90 * a RWops... | |
| 91 */ | |
| 92 | |
| 93 size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) | |
| 94 { | |
| 95 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb)); | |
| 96 } /* RWops_ogg_read */ | |
| 97 | |
| 98 int RWops_ogg_seek(void *datasource, int64_t offset, int whence) | |
| 99 { | |
| 100 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence)); | |
| 101 } /* RWops_ogg_seek */ | |
| 102 | |
| 103 int RWops_ogg_close(void *datasource) | |
| 104 { | |
| 105 /* do nothing; SDL_sound will delete the RWops at a higher level. */ | |
| 106 return(0); /* this is success in fclose(), so I guess that's okay. */ | |
| 107 } /* RWops_ogg_close */ | |
| 108 | |
| 109 long RWops_ogg_tell(void *datasource) | |
| 110 { | |
| 111 return((long) SDL_RWtell((SDL_RWops *) datasource)); | |
| 112 } /* RWops_ogg_tell */ | |
| 113 | |
| 114 static const ov_callbacks RWops_ogg_callbacks = | |
| 115 { | |
| 116 RWops_ogg_read, | |
| 117 RWops_ogg_seek, | |
| 118 RWops_ogg_close, | |
| 119 RWops_ogg_tell | |
| 120 }; | |
| 121 | |
| 122 | |
| 123 /* Return a human readable version of an VorbisFile error code... */ | |
| 124 static const char *ogg_error(int errnum) | |
| 125 { | |
| 126 switch(errnum) | |
| 127 { | |
| 128 case OV_EREAD: | |
| 129 return("i/o error"); | |
| 130 case OV_ENOTVORBIS: | |
| 131 return("not a vorbis file"); | |
| 132 case OV_EVERSION: | |
| 133 return("Vorbis version mismatch"); | |
| 134 case OV_EBADHEADER: | |
| 135 return("invalid Vorbis bitstream header"); | |
| 136 case OV_EFAULT: | |
| 137 return("internal logic fault in Vorbis library"); | |
| 138 } /* switch */ | |
| 139 | |
| 140 return("unknown error"); | |
| 141 } /* ogg_error */ | |
| 142 | |
| 143 | |
| 144 static __inline__ void output_ogg_comments(OggVorbis_File *vf) | |
| 145 { | |
| 146 #if (defined DEBUG_CHATTER) | |
| 147 int i; | |
| 148 vorbis_comment *vc = ov_comment(vf, -1); | |
| 149 | |
| 150 if (vc == NULL) | |
| 151 return; | |
| 152 | |
| 153 _D(("OGG: vendor == [%s].\n", vc->vendor)); | |
| 154 for (i = 0; i < vc->comments; i++) | |
| 155 { | |
| 156 _D(("OGG: user comment [%s].\n", vc->user_comments[i])); | |
| 157 } /* for */ | |
| 158 #endif | |
| 159 } /* output_ogg_comments */ | |
| 160 | |
| 161 | |
| 162 static int OGG_open(Sound_Sample *sample, const char *ext) | |
| 163 { | |
| 164 int rc; | |
| 165 OggVorbis_File *vf; | |
| 166 vorbis_info *info; | |
| 167 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 168 | |
| 169 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File)); | |
| 170 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0); | |
| 171 | |
| 172 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks); | |
| 173 if (rc != 0) | |
| 174 { | |
| 175 _D(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc))); | |
| 176 free(vf); | |
| 177 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0); | |
| 178 } /* if */ | |
| 179 | |
| 180 info = ov_info(vf, -1); | |
| 181 if (info == NULL) | |
| 182 { | |
| 183 ov_clear(vf); | |
| 184 free(vf); | |
| 185 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0); | |
| 186 } /* if */ | |
| 187 | |
| 188 _D(("OGG: Accepting data stream.\n")); | |
| 189 | |
| 190 output_ogg_comments(vf); | |
| 191 _D(("OGG: bitstream version == (%d).\n", info->version)); | |
| 192 _D(("OGG: bitstream channels == (%d).\n", info->channels)); | |
| 193 _D(("OGG: bitstream sampling rate == (%ld).\n", info->rate)); | |
| 194 _D(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE")); | |
| 195 _D(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf))); | |
| 196 _D(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1))); | |
| 197 _D(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1))); | |
| 198 | |
| 199 internal->decoder_private = vf; | |
| 200 sample->flags = SOUND_SAMPLEFLAG_NONE; | |
| 201 sample->actual.rate = (Uint32) info->rate; | |
| 202 sample->actual.channels = (Uint8) info->channels; | |
| 203 | |
| 204 /* | |
| 205 * Since we might have more than one logical bitstream in the OGG file, | |
| 206 * and these bitstreams may be in different formats, we might be | |
| 207 * converting two or three times: once in vorbisfile, once again in | |
| 208 * SDL_sound, and perhaps a third time to get it to the sound device's | |
| 209 * format. That's wickedly inefficient. | |
| 210 * | |
| 211 * To combat this a little, if the user specified a desired format, we | |
| 212 * claim that to be the "actual" format of the collection of logical | |
| 213 * bitstreams. This means that VorbisFile will do a conversion as | |
| 214 * necessary, and SDL_sound will not. If the user didn't specify a | |
| 215 * desired format, then we pretend the "actual" format is something that | |
| 216 * OGG files are apparently commonly encoded in. | |
| 217 */ | |
| 218 sample->actual.format = (sample->desired.format == 0) ? | |
| 219 AUDIO_S16LSB : sample->desired.format; | |
| 220 return(1); | |
| 221 } /* OGG_open */ | |
| 222 | |
| 223 | |
| 224 static void OGG_close(Sound_Sample *sample) | |
| 225 { | |
| 226 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 227 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 228 ov_clear(vf); | |
| 229 free(vf); | |
| 230 } /* OGG_close */ | |
| 231 | |
| 232 | |
| 233 static Uint32 OGG_read(Sound_Sample *sample) | |
| 234 { | |
| 235 int rc; | |
| 236 int bitstream; | |
| 237 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
| 238 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
| 239 | |
| 240 rc = ov_read(vf, internal->buffer, internal->buffer_size, | |
| 241 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */ | |
| 242 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */ | |
| 243 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */ | |
| 244 &bitstream); | |
| 245 | |
| 246 /* Make sure the read went smoothly... */ | |
| 247 if (rc == 0) | |
| 248 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
| 249 | |
| 250 else if (rc < 0) | |
| 251 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
| 252 | |
| 253 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
| 254 else if ((Uint32) rc < internal->buffer_size) | |
| 255 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
| 256 | |
| 257 return((Uint32) rc); | |
| 258 } /* OGG_read */ | |
| 259 | |
| 260 /* end of ogg.c ... */ | |
| 261 |