Mercurial > SDL_sound_CoreAudio
annotate decoders/flac.c @ 453:b9856ba6fb4e
Updated comments on supported files to include Speex.
author | Ryan C. Gordon <icculus@icculus.org> |
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date | Sat, 13 Sep 2003 20:35:24 +0000 |
parents | 30f96c853462 |
children | c66080364dff c5f184b4b2cd |
rev | line source |
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155 | 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 * FLAC decoder for SDL_sound. | |
22 * | |
23 * This driver handles FLAC audio, that is to say the Free Lossless Audio | |
24 * Codec. It depends on libFLAC for decoding, which can be grabbed from: | |
25 * http://flac.sourceforge.net | |
26 * | |
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27 * Please see the file COPYING in the source's root directory. |
155 | 28 * |
29 * This file written by Torbjörn Andersson. (d91tan@Update.UU.SE) | |
30 */ | |
31 | |
32 #if HAVE_CONFIG_H | |
33 # include <config.h> | |
34 #endif | |
35 | |
36 #ifdef SOUND_SUPPORTS_FLAC | |
37 | |
38 #include <stdio.h> | |
39 #include <stdlib.h> | |
40 #include <string.h> | |
41 | |
42 #include "SDL_sound.h" | |
43 | |
44 #define __SDL_SOUND_INTERNAL__ | |
45 #include "SDL_sound_internal.h" | |
46 | |
443 | 47 #include <FLAC/seekable_stream_decoder.h> |
312 | 48 |
49 #define D_END_OF_STREAM FLAC__SEEKABLE_STREAM_DECODER_END_OF_STREAM | |
50 | |
51 #define d_new() FLAC__seekable_stream_decoder_new() | |
52 #define d_init(x) FLAC__seekable_stream_decoder_init(x) | |
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53 #define d_process_metadata(x) FLAC__seekable_stream_decoder_process_until_end_of_metadata(x) |
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54 #define d_process_one_frame(x) FLAC__seekable_stream_decoder_process_single(x) |
312 | 55 #define d_get_state(x) FLAC__seekable_stream_decoder_get_state(x) |
56 #define d_finish(x) FLAC__seekable_stream_decoder_finish(x) | |
57 #define d_delete(x) FLAC__seekable_stream_decoder_delete(x) | |
58 #define d_set_read_callback(x, y) FLAC__seekable_stream_decoder_set_read_callback(x, y) | |
59 #define d_set_write_callback(x, y) FLAC__seekable_stream_decoder_set_write_callback(x, y) | |
60 #define d_set_metadata_callback(x, y) FLAC__seekable_stream_decoder_set_metadata_callback(x, y) | |
61 #define d_set_error_callback(x, y) FLAC__seekable_stream_decoder_set_error_callback(x, y) | |
62 #define d_set_client_data(x, y) FLAC__seekable_stream_decoder_set_client_data(x, y) | |
63 | |
64 typedef FLAC__SeekableStreamDecoder decoder_t; | |
65 typedef FLAC__SeekableStreamDecoderReadStatus d_read_status_t; | |
66 | |
67 #define D_SEEK_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_OK | |
68 #define D_SEEK_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_SEEK_STATUS_ERROR | |
69 #define D_TELL_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_OK | |
70 #define D_TELL_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_TELL_STATUS_ERROR | |
71 #define D_LENGTH_STATUS_OK FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_OK | |
72 #define D_LENGTH_STATUS_ERROR FLAC__SEEKABLE_STREAM_DECODER_LENGTH_STATUS_ERROR | |
73 | |
74 #define d_set_seek_callback(x, y) FLAC__seekable_stream_decoder_set_seek_callback(x, y) | |
75 #define d_set_tell_callback(x, y) FLAC__seekable_stream_decoder_set_tell_callback(x, y) | |
76 #define d_set_length_callback(x, y) FLAC__seekable_stream_decoder_set_length_callback(x, y) | |
77 #define d_set_eof_callback(x, y) FLAC__seekable_stream_decoder_set_eof_callback(x, y) | |
78 #define d_seek_absolute(x, y) FLAC__seekable_stream_decoder_seek_absolute(x, y) | |
79 | |
80 typedef FLAC__SeekableStreamDecoderSeekStatus d_seek_status_t; | |
81 typedef FLAC__SeekableStreamDecoderTellStatus d_tell_status_t; | |
82 typedef FLAC__SeekableStreamDecoderLengthStatus d_length_status_t; | |
83 | |
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84 #define D_WRITE_CONTINUE FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE |
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85 #define D_READ_END_OF_STREAM FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM |
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86 #define D_READ_ABORT FLAC__STREAM_DECODER_READ_STATUS_ABORT |
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87 #define D_READ_CONTINUE FLAC__STREAM_DECODER_READ_STATUS_CONTINUE |
312 | 88 |
89 #define d_error_status_string FLAC__StreamDecoderErrorStatusString | |
90 | |
393
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91 typedef FLAC__StreamDecoderErrorStatus d_error_status_t; |
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92 typedef FLAC__StreamMetadata d_metadata_t; |
312 | 93 typedef FLAC__StreamDecoderWriteStatus d_write_status_t; |
94 | |
155 | 95 |
96 static int FLAC_init(void); | |
97 static void FLAC_quit(void); | |
98 static int FLAC_open(Sound_Sample *sample, const char *ext); | |
99 static void FLAC_close(Sound_Sample *sample); | |
100 static Uint32 FLAC_read(Sound_Sample *sample); | |
221
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101 static int FLAC_rewind(Sound_Sample *sample); |
306
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102 static int FLAC_seek(Sound_Sample *sample, Uint32 ms); |
155 | 103 |
104 static const char *extensions_flac[] = { "FLAC", "FLA", NULL }; | |
105 | |
106 const Sound_DecoderFunctions __Sound_DecoderFunctions_FLAC = | |
107 { | |
108 { | |
109 extensions_flac, | |
110 "Free Lossless Audio Codec", | |
111 "Torbjörn Andersson <d91tan@Update.UU.SE>", | |
112 "http://flac.sourceforge.net/" | |
113 }, | |
114 | |
221
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115 FLAC_init, /* init() method */ |
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116 FLAC_quit, /* quit() method */ |
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117 FLAC_open, /* open() method */ |
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118 FLAC_close, /* close() method */ |
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119 FLAC_read, /* read() method */ |
306
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120 FLAC_rewind, /* rewind() method */ |
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121 FLAC_seek /* seek() method */ |
155 | 122 }; |
123 | |
124 /* This is what we store in our internal->decoder_private field. */ | |
125 typedef struct | |
126 { | |
312 | 127 decoder_t *decoder; |
155 | 128 SDL_RWops *rw; |
129 Sound_Sample *sample; | |
130 Uint32 frame_size; | |
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131 Uint8 is_flac; |
312 | 132 Uint32 stream_length; |
155 | 133 } flac_t; |
134 | |
135 | |
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136 static void free_flac(flac_t *f) |
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137 { |
312 | 138 d_finish(f->decoder); |
139 d_delete(f->decoder); | |
166
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140 free(f); |
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141 } /* free_flac */ |
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142 |
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143 |
312 | 144 static d_read_status_t read_callback( |
145 const decoder_t *decoder, FLAC__byte buffer[], | |
155 | 146 unsigned int *bytes, void *client_data) |
147 { | |
148 flac_t *f = (flac_t *) client_data; | |
149 Uint32 retval; | |
150 | |
151 retval = SDL_RWread(f->rw, (Uint8 *) buffer, 1, *bytes); | |
152 | |
153 if (retval == 0) | |
154 { | |
155 *bytes = 0; | |
156 f->sample->flags |= SOUND_SAMPLEFLAG_EOF; | |
312 | 157 return(D_READ_END_OF_STREAM); |
155 | 158 } /* if */ |
159 | |
160 if (retval == -1) | |
161 { | |
162 *bytes = 0; | |
163 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
312 | 164 return(D_READ_ABORT); |
155 | 165 } /* if */ |
166 | |
167 if (retval < *bytes) | |
168 { | |
169 *bytes = retval; | |
170 f->sample->flags |= SOUND_SAMPLEFLAG_EAGAIN; | |
171 } /* if */ | |
172 | |
312 | 173 return(D_READ_CONTINUE); |
174 } /* read_callback */ | |
155 | 175 |
176 | |
312 | 177 static d_write_status_t write_callback( |
178 const decoder_t *decoder, const FLAC__Frame *frame, | |
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179 const FLAC__int32 * const buffer[], |
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180 void *client_data) |
155 | 181 { |
182 flac_t *f = (flac_t *) client_data; | |
183 Uint32 i, j; | |
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184 Uint32 sample; |
155 | 185 Uint8 *dst; |
186 | |
187 f->frame_size = frame->header.channels * frame->header.blocksize | |
188 * frame->header.bits_per_sample / 8; | |
189 | |
190 if (f->frame_size > f->sample->buffer_size) | |
191 Sound_SetBufferSize(f->sample, f->frame_size); | |
192 | |
193 dst = f->sample->buffer; | |
194 | |
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195 /* If the sample is neither exactly 8-bit nor 16-bit, it will have to |
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196 * be converted. Unfortunately the buffer is read-only, so we either |
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197 * have to check for each sample, or make a copy of the buffer. I'm |
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198 * not sure which way is best, so I've arbitrarily picked the former. |
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199 */ |
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200 if (f->sample->actual.format == AUDIO_S8) |
155 | 201 { |
202 for (i = 0; i < frame->header.blocksize; i++) | |
203 for (j = 0; j < frame->header.channels; j++) | |
166
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204 { |
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205 sample = buffer[j][i]; |
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206 if (frame->header.bits_per_sample < 8) |
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207 sample <<= (8 - frame->header.bits_per_sample); |
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208 *dst++ = sample & 0x00ff; |
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209 } /* for */ |
155 | 210 } /* if */ |
211 else | |
212 { | |
213 for (i = 0; i < frame->header.blocksize; i++) | |
214 for (j = 0; j < frame->header.channels; j++) | |
215 { | |
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216 sample = buffer[j][i]; |
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217 if (frame->header.bits_per_sample < 16) |
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218 sample <<= (16 - frame->header.bits_per_sample); |
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219 else if (frame->header.bits_per_sample > 16) |
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220 sample >>= (frame->header.bits_per_sample - 16); |
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221 *dst++ = (sample & 0xff00) >> 8; |
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222 *dst++ = sample & 0x00ff; |
155 | 223 } /* for */ |
224 } /* else */ | |
225 | |
312 | 226 return(D_WRITE_CONTINUE); |
227 } /* write_callback */ | |
155 | 228 |
229 | |
312 | 230 static void metadata_callback( |
231 const decoder_t *decoder, | |
232 const d_metadata_t *metadata, | |
155 | 233 void *client_data) |
234 { | |
235 flac_t *f = (flac_t *) client_data; | |
312 | 236 |
155 | 237 SNDDBG(("FLAC: Metadata callback.\n")); |
238 | |
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239 /* There are several kinds of metadata, but STREAMINFO is the only |
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240 * one that always has to be there. |
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241 */ |
155 | 242 if (metadata->type == FLAC__METADATA_TYPE_STREAMINFO) |
243 { | |
244 SNDDBG(("FLAC: Metadata is streaminfo.\n")); | |
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245 |
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246 f->is_flac = 1; |
155 | 247 f->sample->actual.channels = metadata->data.stream_info.channels; |
248 f->sample->actual.rate = metadata->data.stream_info.sample_rate; | |
249 | |
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250 if (metadata->data.stream_info.bits_per_sample > 8) |
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251 f->sample->actual.format = AUDIO_S16MSB; |
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252 else |
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253 f->sample->actual.format = AUDIO_S8; |
155 | 254 } /* if */ |
312 | 255 } /* metadata_callback */ |
155 | 256 |
257 | |
312 | 258 static void error_callback( |
259 const decoder_t *decoder, | |
260 d_error_status_t status, | |
155 | 261 void *client_data) |
262 { | |
263 flac_t *f = (flac_t *) client_data; | |
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264 |
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265 __Sound_SetError(d_error_status_string[status]); |
155 | 266 f->sample->flags |= SOUND_SAMPLEFLAG_ERROR; |
312 | 267 } /* error_callback */ |
268 | |
269 | |
270 static d_seek_status_t seek_callback( | |
271 const decoder_t *decoder, | |
272 FLAC__uint64 absolute_byte_offset, | |
273 void *client_data) | |
274 { | |
275 flac_t *f = (flac_t *) client_data; | |
276 | |
277 if (SDL_RWseek(f->rw, absolute_byte_offset, SEEK_SET) >= 0) | |
278 { | |
279 return(D_SEEK_STATUS_OK); | |
280 } /* if */ | |
281 | |
282 return(D_SEEK_STATUS_ERROR); | |
283 } /* seek_callback*/ | |
284 | |
285 | |
286 static d_tell_status_t tell_callback( | |
287 const decoder_t *decoder, | |
288 FLAC__uint64 *absolute_byte_offset, | |
289 void *client_data) | |
290 { | |
291 flac_t *f = (flac_t *) client_data; | |
400 | 292 int pos; |
312 | 293 |
294 pos = SDL_RWtell(f->rw); | |
295 | |
296 if (pos < 0) | |
297 { | |
298 return(D_TELL_STATUS_ERROR); | |
299 } /* if */ | |
155 | 300 |
312 | 301 *absolute_byte_offset = pos; |
302 return(D_TELL_STATUS_OK); | |
303 } /* tell_callback */ | |
304 | |
305 | |
306 static d_length_status_t length_callback( | |
307 const decoder_t *decoder, | |
308 FLAC__uint64 *stream_length, | |
309 void *client_data) | |
310 { | |
311 flac_t *f = (flac_t *) client_data; | |
312 | |
313 if (f->sample->flags & SOUND_SAMPLEFLAG_CANSEEK) | |
314 { | |
315 *stream_length = f->stream_length; | |
316 return(D_LENGTH_STATUS_OK); | |
317 } /* if */ | |
318 | |
319 return(D_LENGTH_STATUS_ERROR); | |
320 } /* length_callback */ | |
321 | |
322 | |
323 static FLAC__bool eof_callback( | |
324 const decoder_t *decoder, | |
325 void *client_data) | |
326 { | |
327 flac_t *f = (flac_t *) client_data; | |
400 | 328 int pos; |
312 | 329 |
330 /* Maybe we could check for SOUND_SAMPLEFLAG_EOF here instead? */ | |
331 pos = SDL_RWtell(f->rw); | |
332 | |
333 if (pos >= 0 && pos >= f->stream_length) | |
334 { | |
335 return(true); | |
336 } /* if */ | |
337 | |
338 return(false); | |
339 } /* eof_callback */ | |
340 | |
155 | 341 |
342 static int FLAC_init(void) | |
343 { | |
344 return(1); /* always succeeds. */ | |
345 } /* FLAC_init */ | |
346 | |
347 | |
348 static void FLAC_quit(void) | |
349 { | |
350 /* it's a no-op. */ | |
351 } /* FLAC_quit */ | |
352 | |
353 | |
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354 #define FLAC_MAGIC 0x43614C66 /* "fLaC" in ASCII. */ |
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355 |
155 | 356 static int FLAC_open(Sound_Sample *sample, const char *ext) |
357 { | |
358 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
359 SDL_RWops *rw = internal->rw; | |
312 | 360 decoder_t *decoder; |
155 | 361 flac_t *f; |
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362 int i; |
182
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363 int has_extension = 0; |
312 | 364 Uint32 pos; |
182
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365 |
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366 /* |
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367 * If the extension is "flac", we'll believe that this is really meant |
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368 * to be a FLAC stream, and will try to grok it from existing metadata. |
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369 * metadata searching can be a very expensive operation, however, so |
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370 * unless the user swears that it is a FLAC stream through the extension, |
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371 * we decide what to do based on the existance of a 32-bit magic number. |
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372 */ |
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373 for (i = 0; extensions_flac[i] != NULL; i++) |
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374 { |
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375 if (__Sound_strcasecmp(ext, extensions_flac[i]) == 0) |
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376 { |
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377 has_extension = 1; |
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378 break; |
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379 } /* if */ |
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380 } /* for */ |
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381 |
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382 if (!has_extension) |
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383 { |
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384 int rc; |
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385 Uint32 flac_magic = SDL_ReadLE32(rw); |
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386 BAIL_IF_MACRO(flac_magic != FLAC_MAGIC, "FLAC: Not a FLAC stream.", 0); |
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387 |
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388 /* move back over magic number for metadata scan... */ |
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389 rc = SDL_RWseek(internal->rw, -sizeof (flac_magic), SEEK_CUR); |
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390 BAIL_IF_MACRO(rc < 0, ERR_IO_ERROR, 0); |
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391 } /* if */ |
155 | 392 |
393 f = (flac_t *) malloc(sizeof (flac_t)); | |
394 BAIL_IF_MACRO(f == NULL, ERR_OUT_OF_MEMORY, 0); | |
395 | |
312 | 396 decoder = d_new(); |
155 | 397 if (decoder == NULL) |
398 { | |
399 free(f); | |
387
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400 BAIL_MACRO(ERR_OUT_OF_MEMORY, 0); |
155 | 401 } /* if */ |
402 | |
312 | 403 d_set_read_callback(decoder, read_callback); |
404 d_set_write_callback(decoder, write_callback); | |
405 d_set_metadata_callback(decoder, metadata_callback); | |
406 d_set_error_callback(decoder, error_callback); | |
407 d_set_seek_callback(decoder, seek_callback); | |
408 d_set_tell_callback(decoder, tell_callback); | |
409 d_set_length_callback(decoder, length_callback); | |
410 d_set_eof_callback(decoder, eof_callback); | |
422
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411 |
312 | 412 d_set_client_data(decoder, f); |
155 | 413 |
414 f->rw = internal->rw; | |
415 f->sample = sample; | |
416 f->decoder = decoder; | |
164
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417 f->sample->actual.format = 0; |
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418 f->is_flac = 0 /* !!! FIXME: should be "has_extension", not "0". */; |
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419 |
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420 internal->decoder_private = f; |
312 | 421 d_init(decoder); |
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422 |
400 | 423 sample->flags = SOUND_SAMPLEFLAG_NONE; |
424 | |
425 pos = SDL_RWtell(f->rw); | |
426 if (SDL_RWseek(f->rw, 0, SEEK_END) > 0) | |
427 { | |
428 f->stream_length = SDL_RWtell(f->rw); | |
429 if (SDL_RWseek(f->rw, pos, SEEK_SET) == -1) | |
430 { | |
431 free_flac(f); | |
432 BAIL_MACRO(ERR_IO_ERROR, 0); | |
433 } /* if */ | |
434 sample->flags = SOUND_SAMPLEFLAG_CANSEEK; | |
435 } /* if */ | |
436 | |
231
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437 /* |
182
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438 * If we are not sure this is a FLAC stream, check for the STREAMINFO |
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439 * metadata block. If not, we'd have to peek at the first audio frame |
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440 * and get the sound format from there, but that is not yet |
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441 * implemented. |
166
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442 */ |
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443 if (!f->is_flac) |
155 | 444 { |
312 | 445 d_process_metadata(decoder); |
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446 |
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447 /* Still not FLAC? Give up. */ |
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448 if (!f->is_flac) |
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449 { |
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450 free_flac(f); |
387
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451 BAIL_MACRO("FLAC: No metadata found. Not a FLAC stream?", 0); |
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452 } /* if */ |
155 | 453 } /* if */ |
454 | |
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455 SNDDBG(("FLAC: Accepting data stream.\n")); |
155 | 456 return(1); |
457 } /* FLAC_open */ | |
458 | |
459 | |
460 static void FLAC_close(Sound_Sample *sample) | |
461 { | |
462 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
463 flac_t *f = (flac_t *) internal->decoder_private; | |
464 | |
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465 free_flac(f); |
155 | 466 } /* FLAC_close */ |
467 | |
468 | |
469 static Uint32 FLAC_read(Sound_Sample *sample) | |
470 { | |
471 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; | |
472 flac_t *f = (flac_t *) internal->decoder_private; | |
473 Uint32 len; | |
474 | |
312 | 475 if (!d_process_one_frame(f->decoder)) |
155 | 476 { |
477 sample->flags |= SOUND_SAMPLEFLAG_ERROR; | |
387
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478 BAIL_MACRO("FLAC: Couldn't decode frame.", 0); |
155 | 479 } /* if */ |
480 | |
312 | 481 if (d_get_state(f->decoder) == D_END_OF_STREAM) |
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482 { |
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483 sample->flags |= SOUND_SAMPLEFLAG_EOF; |
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484 return(0); |
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485 } /* if */ |
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486 |
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487 /* An error may have been signalled through the error callback. */ |
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488 if (sample->flags & SOUND_SAMPLEFLAG_ERROR) |
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489 return(0); |
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490 |
155 | 491 return(f->frame_size); |
492 } /* FLAC_read */ | |
493 | |
221
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494 |
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495 static int FLAC_rewind(Sound_Sample *sample) |
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496 { |
312 | 497 return FLAC_seek(sample, 0); |
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498 } /* FLAC_rewind */ |
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499 |
306
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500 |
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501 static int FLAC_seek(Sound_Sample *sample, Uint32 ms) |
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502 { |
312 | 503 Sound_SampleInternal *internal = (Sound_SampleInternal *) sample->opaque; |
504 flac_t *f = (flac_t *) internal->decoder_private; | |
505 | |
506 d_seek_absolute(f->decoder, (ms * sample->actual.rate) / 1000); | |
507 return(1); | |
306
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508 } /* FLAC_seek */ |
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509 |
155 | 510 #endif /* SOUND_SUPPORTS_FLAC */ |
511 | |
512 /* end of flac.c ... */ |