Mercurial > SDL_sound_CoreAudio
annotate decoders/ogg.c @ 387:fb519e6028e3
Changed all the Sound_SetError() calls to __Sound_SetError (or BAIL*_MACRO)
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Fri, 05 Jul 2002 23:11:51 +0000 |
parents | cbb15ecf423a |
children | f1c16afd9ebe |
rev | line source |
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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> | |
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45 |
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46 #include "SDL_sound.h" |
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47 |
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48 #define __SDL_SOUND_INTERNAL__ |
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49 #include "SDL_sound_internal.h" |
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50 |
24 | 51 #include "vorbis/codec.h" |
52 #include "vorbis/vorbisfile.h" | |
53 | |
54 | |
47
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55 static int OGG_init(void); |
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56 static void OGG_quit(void); |
24 | 57 static int OGG_open(Sound_Sample *sample, const char *ext); |
58 static void OGG_close(Sound_Sample *sample); | |
59 static Uint32 OGG_read(Sound_Sample *sample); | |
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60 static int OGG_rewind(Sound_Sample *sample); |
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61 static int OGG_seek(Sound_Sample *sample, Uint32 ms); |
24 | 62 |
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63 static const char *extensions_ogg[] = { "OGG", NULL }; |
24 | 64 const Sound_DecoderFunctions __Sound_DecoderFunctions_OGG = |
65 { | |
66 { | |
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67 extensions_ogg, |
24 | 68 "Ogg Vorbis audio through VorbisFile", |
69 "Ryan C. Gordon <icculus@clutteredmind.org>", | |
70 "http://www.icculus.org/SDL_sound/" | |
71 }, | |
72 | |
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73 OGG_init, /* init() method */ |
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74 OGG_quit, /* quit() method */ |
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75 OGG_open, /* open() method */ |
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76 OGG_close, /* close() method */ |
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77 OGG_read, /* read() method */ |
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78 OGG_rewind, /* rewind() method */ |
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79 OGG_seek /* seek() method */ |
24 | 80 }; |
81 | |
82 | |
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83 static int OGG_init(void) |
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84 { |
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85 return(1); /* always succeeds. */ |
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86 } /* OGG_init */ |
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87 |
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88 |
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89 static void OGG_quit(void) |
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90 { |
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91 /* it's a no-op. */ |
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92 } /* OGG_quit */ |
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93 |
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94 |
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95 |
24 | 96 /* |
97 * These are callbacks from vorbisfile that let them read data from | |
98 * a RWops... | |
99 */ | |
100 | |
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101 static size_t RWops_ogg_read(void *ptr, size_t size, size_t nmemb, void *datasource) |
24 | 102 { |
103 return((size_t) SDL_RWread((SDL_RWops *) datasource, ptr, size, nmemb)); | |
104 } /* RWops_ogg_read */ | |
105 | |
122 | 106 static int RWops_ogg_seek(void *datasource, ogg_int64_t offset, int whence) |
24 | 107 { |
108 return(SDL_RWseek((SDL_RWops *) datasource, offset, whence)); | |
109 } /* RWops_ogg_seek */ | |
110 | |
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111 static int RWops_ogg_close(void *datasource) |
24 | 112 { |
113 /* do nothing; SDL_sound will delete the RWops at a higher level. */ | |
114 return(0); /* this is success in fclose(), so I guess that's okay. */ | |
115 } /* RWops_ogg_close */ | |
116 | |
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117 static long RWops_ogg_tell(void *datasource) |
24 | 118 { |
119 return((long) SDL_RWtell((SDL_RWops *) datasource)); | |
120 } /* RWops_ogg_tell */ | |
121 | |
122 static const ov_callbacks RWops_ogg_callbacks = | |
123 { | |
124 RWops_ogg_read, | |
125 RWops_ogg_seek, | |
126 RWops_ogg_close, | |
127 RWops_ogg_tell | |
128 }; | |
129 | |
130 | |
131 /* Return a human readable version of an VorbisFile error code... */ | |
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132 #if (defined DEBUG_CHATTER) |
24 | 133 static const char *ogg_error(int errnum) |
134 { | |
135 switch(errnum) | |
136 { | |
137 case OV_EREAD: | |
138 return("i/o error"); | |
139 case OV_ENOTVORBIS: | |
140 return("not a vorbis file"); | |
141 case OV_EVERSION: | |
142 return("Vorbis version mismatch"); | |
143 case OV_EBADHEADER: | |
144 return("invalid Vorbis bitstream header"); | |
145 case OV_EFAULT: | |
146 return("internal logic fault in Vorbis library"); | |
147 } /* switch */ | |
148 | |
149 return("unknown error"); | |
150 } /* ogg_error */ | |
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151 #endif |
24 | 152 |
153 static __inline__ void output_ogg_comments(OggVorbis_File *vf) | |
154 { | |
155 #if (defined DEBUG_CHATTER) | |
156 int i; | |
157 vorbis_comment *vc = ov_comment(vf, -1); | |
158 | |
159 if (vc == NULL) | |
160 return; | |
161 | |
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162 SNDDBG(("OGG: vendor == [%s].\n", vc->vendor)); |
24 | 163 for (i = 0; i < vc->comments; i++) |
164 { | |
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165 SNDDBG(("OGG: user comment [%s].\n", vc->user_comments[i])); |
24 | 166 } /* for */ |
167 #endif | |
168 } /* output_ogg_comments */ | |
169 | |
170 | |
171 static int OGG_open(Sound_Sample *sample, const char *ext) | |
172 { | |
173 int rc; | |
174 OggVorbis_File *vf; | |
175 vorbis_info *info; | |
176 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
177 | |
178 vf = (OggVorbis_File *) malloc(sizeof (OggVorbis_File)); | |
179 BAIL_IF_MACRO(vf == NULL, ERR_OUT_OF_MEMORY, 0); | |
180 | |
181 rc = ov_open_callbacks(internal->rw, vf, NULL, 0, RWops_ogg_callbacks); | |
182 if (rc != 0) | |
183 { | |
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184 SNDDBG(("OGG: can't grok data. reason: [%s].\n", ogg_error(rc))); |
24 | 185 free(vf); |
186 BAIL_MACRO("OGG: Not valid Ogg Vorbis data.", 0); | |
187 } /* if */ | |
188 | |
189 info = ov_info(vf, -1); | |
190 if (info == NULL) | |
191 { | |
192 ov_clear(vf); | |
193 free(vf); | |
194 BAIL_MACRO("OGG: failed to retrieve bitstream info", 0); | |
195 } /* if */ | |
196 | |
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197 SNDDBG(("OGG: Accepting data stream.\n")); |
24 | 198 |
199 output_ogg_comments(vf); | |
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200 SNDDBG(("OGG: bitstream version == (%d).\n", info->version)); |
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201 SNDDBG(("OGG: bitstream channels == (%d).\n", info->channels)); |
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202 SNDDBG(("OGG: bitstream sampling rate == (%ld).\n", info->rate)); |
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203 SNDDBG(("OGG: seekable == {%s}.\n", ov_seekable(vf) ? "TRUE" : "FALSE")); |
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204 SNDDBG(("OGG: number of logical bitstreams == (%ld).\n", ov_streams(vf))); |
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205 SNDDBG(("OGG: serial number == (%ld).\n", ov_serialnumber(vf, -1))); |
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206 SNDDBG(("OGG: total seconds of sample == (%f).\n", ov_time_total(vf, -1))); |
24 | 207 |
208 internal->decoder_private = vf; | |
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209 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; |
24 | 210 sample->actual.rate = (Uint32) info->rate; |
211 sample->actual.channels = (Uint8) info->channels; | |
212 | |
213 /* | |
214 * Since we might have more than one logical bitstream in the OGG file, | |
215 * and these bitstreams may be in different formats, we might be | |
216 * converting two or three times: once in vorbisfile, once again in | |
217 * SDL_sound, and perhaps a third time to get it to the sound device's | |
218 * format. That's wickedly inefficient. | |
219 * | |
220 * To combat this a little, if the user specified a desired format, we | |
221 * claim that to be the "actual" format of the collection of logical | |
222 * bitstreams. This means that VorbisFile will do a conversion as | |
223 * necessary, and SDL_sound will not. If the user didn't specify a | |
224 * desired format, then we pretend the "actual" format is something that | |
225 * OGG files are apparently commonly encoded in. | |
226 */ | |
227 sample->actual.format = (sample->desired.format == 0) ? | |
228 AUDIO_S16LSB : sample->desired.format; | |
229 return(1); | |
230 } /* OGG_open */ | |
231 | |
232 | |
233 static void OGG_close(Sound_Sample *sample) | |
234 { | |
235 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
236 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
237 ov_clear(vf); | |
238 free(vf); | |
239 } /* OGG_close */ | |
240 | |
241 | |
242 static Uint32 OGG_read(Sound_Sample *sample) | |
243 { | |
244 int rc; | |
245 int bitstream; | |
246 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
247 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; | |
248 | |
249 rc = ov_read(vf, internal->buffer, internal->buffer_size, | |
250 ((sample->actual.format & 0x1000) ? 1 : 0), /* bigendian? */ | |
251 ((sample->actual.format & 0xFF) / 8), /* bytes per sample point */ | |
252 ((sample->actual.format & 0x8000) ? 1 : 0), /* signed data? */ | |
253 &bitstream); | |
254 | |
255 /* Make sure the read went smoothly... */ | |
256 if (rc == 0) | |
257 sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
258 | |
259 else if (rc < 0) | |
260 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
261 | |
262 /* (next call this EAGAIN may turn into an EOF or error.) */ | |
263 else if ((Uint32) rc < internal->buffer_size) | |
264 sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
265 | |
266 return((Uint32) rc); | |
267 } /* OGG_read */ | |
268 | |
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269 |
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270 static int OGG_rewind(Sound_Sample *sample) |
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271 { |
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272 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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273 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; |
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274 |
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275 BAIL_IF_MACRO(ov_raw_seek(vf, 0) < 0, ERR_IO_ERROR, 0); |
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276 return(1); |
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277 } /* OGG_rewind */ |
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278 |
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279 |
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280 static int OGG_seek(Sound_Sample *sample, Uint32 ms) |
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281 { |
327
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282 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
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283 OggVorbis_File *vf = (OggVorbis_File *) internal->decoder_private; |
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284 double timepos = (((double) ms) / 1000.0); |
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285 BAIL_IF_MACRO(ov_time_seek(vf, timepos) < 0, ERR_IO_ERROR, 0); |
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286 return(1); |
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287 } /* OGG_seek */ |
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289 #endif /* SOUND_SUPPORTS_OGG */ |
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290 |
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291 |
24 | 292 /* end of ogg.c ... */ |
293 |