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stream_decoder.c (87130B)
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1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005 Josh Coalson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 *
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 *
11 * - Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 *
15 * - Neither the name of the Xiph.org Foundation nor the names of its
16 * contributors may be used to endorse or promote products derived from
17 * this software without specific prior written permission.
18 *
19 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR
23 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
24 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
25 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
26 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
27 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
28 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
29 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 */
31
32 #include <stdio.h>
33 #include <stdlib.h> /* for malloc() */
34 #include <string.h> /* for memset/memcpy() */
35 #include "FLAC/assert.h"
36 #include "protected/stream_decoder.h"
37 #include "private/bitbuffer.h"
38 #include "private/bitmath.h"
39 #include "private/cpu.h"
40 #include "private/crc.h"
41 #include "private/fixed.h"
42 #include "private/format.h"
43 #include "private/lpc.h"
44 #include "private/memory.h"
45
46 #ifdef HAVE_CONFIG_H
47 #include <config.h>
48 #endif
49
50 #ifdef max
51 #undef max
52 #endif
53 #define max(a,b) ((a)>(b)?(a):(b))
54
55 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
56 #ifdef _MSC_VER
57 #define FLAC__U64L(x) x
58 #else
59 #define FLAC__U64L(x) x##LLU
60 #endif
61
62 /***********************************************************************
63 *
64 * Private static data
65 *
66 ***********************************************************************/
67
68 static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
69
70 /***********************************************************************
71 *
72 * Private class method prototypes
73 *
74 ***********************************************************************/
75
76 static void set_defaults_(FLAC__StreamDecoder *decoder);
77 static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
78 static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
79 static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
80 static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
81 static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
82 static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
83 static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
84 static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
85 static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
86 static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
87 static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode);
88 static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
89 static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
90 static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
91 static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
92 static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode);
93 static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode);
94 static FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual);
95 static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
96 static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
97
98 /***********************************************************************
99 *
100 * Private class data
101 *
102 ***********************************************************************/
103
104 typedef struct FLAC__StreamDecoderPrivate {
105 FLAC__StreamDecoderReadCallback read_callback;
106 FLAC__StreamDecoderWriteCallback write_callback;
107 FLAC__StreamDecoderMetadataCallback metadata_callback;
108 FLAC__StreamDecoderErrorCallback error_callback;
109 /* generic 32-bit datapath: */
110 void (*local_lpc_restore_signal)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
111 /* generic 64-bit datapath: */
112 void (*local_lpc_restore_signal_64bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
113 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit): */
114 void (*local_lpc_restore_signal_16bit)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
115 /* for use when the signal is <= 16 bits-per-sample, or <= 15 bits-per-sample on a side channel (which requires 1 extra bit), AND order <= 8: */
116 void (*local_lpc_restore_signal_16bit_order8)(const FLAC__int32 residual[], unsigned data_len, const FLAC__int32 qlp_coeff[], unsigned order, int lp_quantization, FLAC__int32 data[]);
117 void *client_data;
118 FLAC__BitBuffer *input;
119 FLAC__int32 *output[FLAC__MAX_CHANNELS];
120 FLAC__int32 *residual[FLAC__MAX_CHANNELS]; /* WATCHOUT: these are the aligned pointers; the real pointers that should be free()'d are residual_unaligned[] below */
121 FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
122 unsigned output_capacity, output_channels;
123 FLAC__uint32 last_frame_number;
124 FLAC__uint32 last_block_size;
125 FLAC__uint64 samples_decoded;
126 FLAC__bool has_stream_info, has_seek_table;
127 FLAC__StreamMetadata stream_info;
128 FLAC__StreamMetadata seek_table;
129 FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
130 FLAC__byte *metadata_filter_ids;
131 unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
132 FLAC__Frame frame;
133 FLAC__bool cached; /* true if there is a byte in lookahead */
134 FLAC__CPUInfo cpuinfo;
135 FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
136 FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
137 /* unaligned (original) pointers to allocated data */
138 FLAC__int32 *residual_unaligned[FLAC__MAX_CHANNELS];
139 } FLAC__StreamDecoderPrivate;
140
141 /***********************************************************************
142 *
143 * Public static class data
144 *
145 ***********************************************************************/
146
147 FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
148 "FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
149 "FLAC__STREAM_DECODER_READ_METADATA",
150 "FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
151 "FLAC__STREAM_DECODER_READ_FRAME",
152 "FLAC__STREAM_DECODER_END_OF_STREAM",
153 "FLAC__STREAM_DECODER_ABORTED",
154 "FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
155 "FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
156 "FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
157 "FLAC__STREAM_DECODER_INVALID_CALLBACK",
158 "FLAC__STREAM_DECODER_UNINITIALIZED"
159 };
160
161 FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
162 "FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
163 "FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
164 "FLAC__STREAM_DECODER_READ_STATUS_ABORT"
165 };
166
167 FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
168 "FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
169 "FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
170 };
171
172 FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
173 "FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
174 "FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
175 "FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
176 };
177
178 /***********************************************************************
179 *
180 * Class constructor/destructor
181 *
182 ***********************************************************************/
183 FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new()
184 {
185 FLAC__StreamDecoder *decoder;
186 unsigned i;
187
188 FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */
189
190 decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
191 if(decoder == 0) {
192 return 0;
193 }
194
195 decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
196 if(decoder->protected_ == 0) {
197 free(decoder);
198 return 0;
199 }
200
201 decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
202 if(decoder->private_ == 0) {
203 free(decoder->protected_);
204 free(decoder);
205 return 0;
206 }
207
208 decoder->private_->input = FLAC__bitbuffer_new();
209 if(decoder->private_->input == 0) {
210 free(decoder->private_);
211 free(decoder->protected_);
212 free(decoder);
213 return 0;
214 }
215
216 decoder->private_->metadata_filter_ids_capacity = 16;
217 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
218 FLAC__bitbuffer_delete(decoder->private_->input);
219 free(decoder->private_);
220 free(decoder->protected_);
221 free(decoder);
222 return 0;
223 }
224
225 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
226 decoder->private_->output[i] = 0;
227 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
228 }
229
230 decoder->private_->output_capacity = 0;
231 decoder->private_->output_channels = 0;
232 decoder->private_->has_seek_table = false;
233
234 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
235 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
236
237 set_defaults_(decoder);
238
239 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
240
241 return decoder;
242 }
243
244 FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
245 {
246 unsigned i;
247
248 FLAC__ASSERT(0 != decoder);
249 FLAC__ASSERT(0 != decoder->protected_);
250 FLAC__ASSERT(0 != decoder->private_);
251 FLAC__ASSERT(0 != decoder->private_->input);
252
253 FLAC__stream_decoder_finish(decoder);
254
255 if(0 != decoder->private_->metadata_filter_ids)
256 free(decoder->private_->metadata_filter_ids);
257
258 FLAC__bitbuffer_delete(decoder->private_->input);
259
260 for(i = 0; i < FLAC__MAX_CHANNELS; i++)
261 FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
262
263 free(decoder->private_);
264 free(decoder->protected_);
265 free(decoder);
266 }
267
268 /***********************************************************************
269 *
270 * Public class methods
271 *
272 ***********************************************************************/
273
274 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
275 {
276 FLAC__ASSERT(0 != decoder);
277
278 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
279 return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
280
281 if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
282 return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
283
284 if(!FLAC__bitbuffer_init(decoder->private_->input))
285 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
286
287 decoder->private_->last_frame_number = 0;
288 decoder->private_->last_block_size = 0;
289 decoder->private_->samples_decoded = 0;
290 decoder->private_->has_stream_info = false;
291 decoder->private_->cached = false;
292
293 /*
294 * get the CPU info and set the function pointers
295 */
296 FLAC__cpu_info(&decoder->private_->cpuinfo);
297 /* first default to the non-asm routines */
298 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
299 decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
300 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
301 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal;
302 /* now override with asm where appropriate */
303 #ifndef FLAC__NO_ASM
304 if(decoder->private_->cpuinfo.use_asm) {
305 #ifdef FLAC__CPU_IA32
306 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
307 #ifdef FLAC__HAS_NASM
308 if(decoder->private_->cpuinfo.data.ia32.mmx) {
309 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
310 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
311 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32_mmx;
312 }
313 else {
314 decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
315 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
316 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ia32;
317 }
318 #endif
319 #elif defined FLAC__CPU_PPC
320 FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_PPC);
321 if(decoder->private_->cpuinfo.data.ppc.altivec) {
322 decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ppc_altivec_16;
323 decoder->private_->local_lpc_restore_signal_16bit_order8 = FLAC__lpc_restore_signal_asm_ppc_altivec_16_order8;
324 }
325 #endif
326 }
327 #endif
328
329 if(!FLAC__stream_decoder_reset(decoder))
330 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
331
332 return decoder->protected_->state;
333 }
334
335 FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
336 {
337 unsigned i;
338 FLAC__ASSERT(0 != decoder);
339 if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
340 return;
341 if(0 != decoder->private_->seek_table.data.seek_table.points) {
342 free(decoder->private_->seek_table.data.seek_table.points);
343 decoder->private_->seek_table.data.seek_table.points = 0;
344 decoder->private_->has_seek_table = false;
345 }
346 FLAC__bitbuffer_free(decoder->private_->input);
347 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
348 /* WATCHOUT:
349 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
350 * output arrays have a buffer of up to 3 zeroes in front
351 * (at negative indices) for alignment purposes; we use 4
352 * to keep the data well-aligned.
353 */
354 if(0 != decoder->private_->output[i]) {
355 free(decoder->private_->output[i]-4);
356 decoder->private_->output[i] = 0;
357 }
358 if(0 != decoder->private_->residual_unaligned[i]) {
359 free(decoder->private_->residual_unaligned[i]);
360 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
361 }
362 }
363 decoder->private_->output_capacity = 0;
364 decoder->private_->output_channels = 0;
365
366 set_defaults_(decoder);
367
368 decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
369 }
370
371 FLAC_API FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback value)
372 {
373 FLAC__ASSERT(0 != decoder);
374 FLAC__ASSERT(0 != decoder->private_);
375 FLAC__ASSERT(0 != decoder->protected_);
376 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
377 return false;
378 decoder->private_->read_callback = value;
379 return true;
380 }
381
382 FLAC_API FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteCallback value)
383 {
384 FLAC__ASSERT(0 != decoder);
385 FLAC__ASSERT(0 != decoder->private_);
386 FLAC__ASSERT(0 != decoder->protected_);
387 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
388 return false;
389 decoder->private_->write_callback = value;
390 return true;
391 }
392
393 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderMetadataCallback value)
394 {
395 FLAC__ASSERT(0 != decoder);
396 FLAC__ASSERT(0 != decoder->private_);
397 FLAC__ASSERT(0 != decoder->protected_);
398 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
399 return false;
400 decoder->private_->metadata_callback = value;
401 return true;
402 }
403
404 FLAC_API FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorCallback value)
405 {
406 FLAC__ASSERT(0 != decoder);
407 FLAC__ASSERT(0 != decoder->private_);
408 FLAC__ASSERT(0 != decoder->protected_);
409 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
410 return false;
411 decoder->private_->error_callback = value;
412 return true;
413 }
414
415 FLAC_API FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
416 {
417 FLAC__ASSERT(0 != decoder);
418 FLAC__ASSERT(0 != decoder->private_);
419 FLAC__ASSERT(0 != decoder->protected_);
420 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
421 return false;
422 decoder->private_->client_data = value;
423 return true;
424 }
425
426 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
427 {
428 FLAC__ASSERT(0 != decoder);
429 FLAC__ASSERT(0 != decoder->private_);
430 FLAC__ASSERT(0 != decoder->protected_);
431 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
432 /* double protection */
433 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
434 return false;
435 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
436 return false;
437 decoder->private_->metadata_filter[type] = true;
438 if(type == FLAC__METADATA_TYPE_APPLICATION)
439 decoder->private_->metadata_filter_ids_count = 0;
440 return true;
441 }
442
443 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
444 {
445 FLAC__ASSERT(0 != decoder);
446 FLAC__ASSERT(0 != decoder->private_);
447 FLAC__ASSERT(0 != decoder->protected_);
448 FLAC__ASSERT(0 != id);
449 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
450 return false;
451
452 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
453 return true;
454
455 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
456
457 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
458 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
459 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
460 decoder->private_->metadata_filter_ids_capacity *= 2;
461 }
462
463 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
464 decoder->private_->metadata_filter_ids_count++;
465
466 return true;
467 }
468
469 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
470 {
471 unsigned i;
472 FLAC__ASSERT(0 != decoder);
473 FLAC__ASSERT(0 != decoder->private_);
474 FLAC__ASSERT(0 != decoder->protected_);
475 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
476 return false;
477 for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
478 decoder->private_->metadata_filter[i] = true;
479 decoder->private_->metadata_filter_ids_count = 0;
480 return true;
481 }
482
483 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
484 {
485 FLAC__ASSERT(0 != decoder);
486 FLAC__ASSERT(0 != decoder->private_);
487 FLAC__ASSERT(0 != decoder->protected_);
488 FLAC__ASSERT((unsigned)type <= FLAC__MAX_METADATA_TYPE_CODE);
489 /* double protection */
490 if((unsigned)type > FLAC__MAX_METADATA_TYPE_CODE)
491 return false;
492 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
493 return false;
494 decoder->private_->metadata_filter[type] = false;
495 if(type == FLAC__METADATA_TYPE_APPLICATION)
496 decoder->private_->metadata_filter_ids_count = 0;
497 return true;
498 }
499
500 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
501 {
502 FLAC__ASSERT(0 != decoder);
503 FLAC__ASSERT(0 != decoder->private_);
504 FLAC__ASSERT(0 != decoder->protected_);
505 FLAC__ASSERT(0 != id);
506 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
507 return false;
508
509 if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
510 return true;
511
512 FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);
513
514 if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
515 if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
516 return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
517 decoder->private_->metadata_filter_ids_capacity *= 2;
518 }
519
520 memcpy(decoder->private_->metadata_filter_ids + decoder->private_->metadata_filter_ids_count * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8));
521 decoder->private_->metadata_filter_ids_count++;
522
523 return true;
524 }
525
526 FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
527 {
528 FLAC__ASSERT(0 != decoder);
529 FLAC__ASSERT(0 != decoder->private_);
530 FLAC__ASSERT(0 != decoder->protected_);
531 if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
532 return false;
533 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
534 decoder->private_->metadata_filter_ids_count = 0;
535 return true;
536 }
537
538 FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
539 {
540 FLAC__ASSERT(0 != decoder);
541 FLAC__ASSERT(0 != decoder->protected_);
542 return decoder->protected_->state;
543 }
544
545 FLAC_API const char *FLAC__stream_decoder_get_resolved_state_string(const FLAC__StreamDecoder *decoder)
546 {
547 return FLAC__StreamDecoderStateString[decoder->protected_->state];
548 }
549
550 FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
551 {
552 FLAC__ASSERT(0 != decoder);
553 FLAC__ASSERT(0 != decoder->protected_);
554 return decoder->protected_->channels;
555 }
556
557 FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
558 {
559 FLAC__ASSERT(0 != decoder);
560 FLAC__ASSERT(0 != decoder->protected_);
561 return decoder->protected_->channel_assignment;
562 }
563
564 FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
565 {
566 FLAC__ASSERT(0 != decoder);
567 FLAC__ASSERT(0 != decoder->protected_);
568 return decoder->protected_->bits_per_sample;
569 }
570
571 FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
572 {
573 FLAC__ASSERT(0 != decoder);
574 FLAC__ASSERT(0 != decoder->protected_);
575 return decoder->protected_->sample_rate;
576 }
577
578 FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
579 {
580 FLAC__ASSERT(0 != decoder);
581 FLAC__ASSERT(0 != decoder->protected_);
582 return decoder->protected_->blocksize;
583 }
584
585 FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
586 {
587 FLAC__ASSERT(0 != decoder);
588 FLAC__ASSERT(0 != decoder->private_);
589 FLAC__ASSERT(0 != decoder->protected_);
590
591 if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
592 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
593 return false;
594 }
595 decoder->private_->last_frame_number = 0;
596 decoder->private_->last_block_size = 0;
597 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
598
599 return true;
600 }
601
602 FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
603 {
604 FLAC__ASSERT(0 != decoder);
605 FLAC__ASSERT(0 != decoder->private_);
606 FLAC__ASSERT(0 != decoder->protected_);
607
608 if(!FLAC__stream_decoder_flush(decoder)) {
609 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
610 return false;
611 }
612 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
613
614 decoder->private_->samples_decoded = 0;
615
616 return true;
617 }
618
619 FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
620 {
621 FLAC__bool got_a_frame;
622 FLAC__ASSERT(0 != decoder);
623 FLAC__ASSERT(0 != decoder->protected_);
624
625 while(1) {
626 switch(decoder->protected_->state) {
627 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
628 if(!find_metadata_(decoder))
629 return false; /* above function sets the status for us */
630 break;
631 case FLAC__STREAM_DECODER_READ_METADATA:
632 if(!read_metadata_(decoder))
633 return false; /* above function sets the status for us */
634 else
635 return true;
636 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
637 if(!frame_sync_(decoder))
638 return true; /* above function sets the status for us */
639 break;
640 case FLAC__STREAM_DECODER_READ_FRAME:
641 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/true))
642 return false; /* above function sets the status for us */
643 if(got_a_frame)
644 return true; /* above function sets the status for us */
645 break;
646 case FLAC__STREAM_DECODER_END_OF_STREAM:
647 case FLAC__STREAM_DECODER_ABORTED:
648 return true;
649 default:
650 FLAC__ASSERT(0);
651 return false;
652 }
653 }
654 }
655
656 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
657 {
658 FLAC__ASSERT(0 != decoder);
659 FLAC__ASSERT(0 != decoder->protected_);
660
661 while(1) {
662 switch(decoder->protected_->state) {
663 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
664 if(!find_metadata_(decoder))
665 return false; /* above function sets the status for us */
666 break;
667 case FLAC__STREAM_DECODER_READ_METADATA:
668 if(!read_metadata_(decoder))
669 return false; /* above function sets the status for us */
670 break;
671 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
672 case FLAC__STREAM_DECODER_READ_FRAME:
673 case FLAC__STREAM_DECODER_END_OF_STREAM:
674 case FLAC__STREAM_DECODER_ABORTED:
675 return true;
676 default:
677 FLAC__ASSERT(0);
678 return false;
679 }
680 }
681 }
682
683 FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
684 {
685 FLAC__bool dummy;
686 FLAC__ASSERT(0 != decoder);
687 FLAC__ASSERT(0 != decoder->protected_);
688
689 while(1) {
690 switch(decoder->protected_->state) {
691 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
692 if(!find_metadata_(decoder))
693 return false; /* above function sets the status for us */
694 break;
695 case FLAC__STREAM_DECODER_READ_METADATA:
696 if(!read_metadata_(decoder))
697 return false; /* above function sets the status for us */
698 break;
699 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
700 if(!frame_sync_(decoder))
701 return true; /* above function sets the status for us */
702 break;
703 case FLAC__STREAM_DECODER_READ_FRAME:
704 if(!read_frame_(decoder, &dummy, /*do_full_decode=*/true))
705 return false; /* above function sets the status for us */
706 break;
707 case FLAC__STREAM_DECODER_END_OF_STREAM:
708 case FLAC__STREAM_DECODER_ABORTED:
709 return true;
710 default:
711 FLAC__ASSERT(0);
712 return false;
713 }
714 }
715 }
716
717 FLAC_API FLAC__bool FLAC__stream_decoder_skip_single_frame(FLAC__StreamDecoder *decoder)
718 {
719 FLAC__bool got_a_frame;
720 FLAC__ASSERT(0 != decoder);
721 FLAC__ASSERT(0 != decoder->protected_);
722
723 while(1) {
724 switch(decoder->protected_->state) {
725 case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
726 case FLAC__STREAM_DECODER_READ_METADATA:
727 return false; /* above function sets the status for us */
728 case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
729 if(!frame_sync_(decoder))
730 return true; /* above function sets the status for us */
731 break;
732 case FLAC__STREAM_DECODER_READ_FRAME:
733 if(!read_frame_(decoder, &got_a_frame, /*do_full_decode=*/false))
734 return false; /* above function sets the status for us */
735 if(got_a_frame)
736 return true; /* above function sets the status for us */
737 break;
738 case FLAC__STREAM_DECODER_END_OF_STREAM:
739 case FLAC__STREAM_DECODER_ABORTED:
740 return true;
741 default:
742 FLAC__ASSERT(0);
743 return false;
744 }
745 }
746 }
747
748 /***********************************************************************
749 *
750 * Protected class methods
751 *
752 ***********************************************************************/
753
754 unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
755 {
756 FLAC__ASSERT(0 != decoder);
757 return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
758 }
759
760 /***********************************************************************
761 *
762 * Private class methods
763 *
764 ***********************************************************************/
765
766 void set_defaults_(FLAC__StreamDecoder *decoder)
767 {
768 decoder->private_->read_callback = 0;
769 decoder->private_->write_callback = 0;
770 decoder->private_->metadata_callback = 0;
771 decoder->private_->error_callback = 0;
772 decoder->private_->client_data = 0;
773
774 memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
775 decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
776 decoder->private_->metadata_filter_ids_count = 0;
777 }
778
779 FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
780 {
781 unsigned i;
782 FLAC__int32 *tmp;
783
784 if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
785 return true;
786
787 /* simply using realloc() is not practical because the number of channels may change mid-stream */
788
789 for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
790 if(0 != decoder->private_->output[i]) {
791 free(decoder->private_->output[i]-4);
792 decoder->private_->output[i] = 0;
793 }
794 if(0 != decoder->private_->residual_unaligned[i]) {
795 free(decoder->private_->residual_unaligned[i]);
796 decoder->private_->residual_unaligned[i] = decoder->private_->residual[i] = 0;
797 }
798 }
799
800 for(i = 0; i < channels; i++) {
801 /* WATCHOUT:
802 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
803 * output arrays have a buffer of up to 3 zeroes in front
804 * (at negative indices) for alignment purposes; we use 4
805 * to keep the data well-aligned.
806 */
807 tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
808 if(tmp == 0) {
809 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
810 return false;
811 }
812 memset(tmp, 0, sizeof(FLAC__int32)*4);
813 decoder->private_->output[i] = tmp + 4;
814
815 /* WATCHOUT:
816 * minimum of quadword alignment for PPC vector optimizations is REQUIRED:
817 */
818 if(!FLAC__memory_alloc_aligned_int32_array(size, &decoder->private_->residual_unaligned[i], &decoder->private_->residual[i])) {
819 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
820 return false;
821 }
822 }
823
824 decoder->private_->output_capacity = size;
825 decoder->private_->output_channels = channels;
826
827 return true;
828 }
829
830 FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
831 {
832 unsigned i;
833
834 FLAC__ASSERT(0 != decoder);
835 FLAC__ASSERT(0 != decoder->private_);
836
837 for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
838 if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
839 return true;
840
841 return false;
842 }
843
844 FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
845 {
846 FLAC__uint32 x;
847 unsigned i, id;
848 FLAC__bool first = true;
849
850 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
851
852 for(i = id = 0; i < 4; ) {
853 if(decoder->private_->cached) {
854 x = (FLAC__uint32)decoder->private_->lookahead;
855 decoder->private_->cached = false;
856 }
857 else {
858 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
859 return false; /* the read_callback_ sets the state for us */
860 }
861 if(x == FLAC__STREAM_SYNC_STRING[i]) {
862 first = true;
863 i++;
864 id = 0;
865 continue;
866 }
867 if(x == ID3V2_TAG_[id]) {
868 id++;
869 i = 0;
870 if(id == 3) {
871 if(!skip_id3v2_tag_(decoder))
872 return false; /* the read_callback_ sets the state for us */
873 }
874 continue;
875 }
876 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
877 decoder->private_->header_warmup[0] = (FLAC__byte)x;
878 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
879 return false; /* the read_callback_ sets the state for us */
880
881 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
882 /* else we have to check if the second byte is the end of a sync code */
883 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
884 decoder->private_->lookahead = (FLAC__byte)x;
885 decoder->private_->cached = true;
886 }
887 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
888 decoder->private_->header_warmup[1] = (FLAC__byte)x;
889 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
890 return true;
891 }
892 }
893 i = 0;
894 if(first) {
895 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
896 first = false;
897 }
898 }
899
900 decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
901 return true;
902 }
903
904 FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
905 {
906 FLAC__bool is_last;
907 FLAC__uint32 i, x, type, length;
908
909 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
910
911 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
912 return false; /* the read_callback_ sets the state for us */
913 is_last = x? true : false;
914
915 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
916 return false; /* the read_callback_ sets the state for us */
917
918 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
919 return false; /* the read_callback_ sets the state for us */
920
921 if(type == FLAC__METADATA_TYPE_STREAMINFO) {
922 if(!read_metadata_streaminfo_(decoder, is_last, length))
923 return false;
924
925 decoder->private_->has_stream_info = true;
926 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
927 decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
928 }
929 else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
930 if(!read_metadata_seektable_(decoder, is_last, length))
931 return false;
932
933 decoder->private_->has_seek_table = true;
934 if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
935 decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
936 }
937 else {
938 FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
939 unsigned real_length = length;
940 FLAC__StreamMetadata block;
941
942 block.is_last = is_last;
943 block.type = (FLAC__MetadataType)type;
944 block.length = length;
945
946 if(type == FLAC__METADATA_TYPE_APPLICATION) {
947 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.id, FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8, read_callback_, decoder))
948 return false; /* the read_callback_ sets the state for us */
949
950 real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;
951
952 if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
953 skip_it = !skip_it;
954 }
955
956 if(skip_it) {
957 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
958 return false; /* the read_callback_ sets the state for us */
959 }
960 else {
961 switch(type) {
962 case FLAC__METADATA_TYPE_PADDING:
963 /* skip the padding bytes */
964 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
965 return false; /* the read_callback_ sets the state for us */
966 break;
967 case FLAC__METADATA_TYPE_APPLICATION:
968 /* remember, we read the ID already */
969 if(real_length > 0) {
970 if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
971 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
972 return false;
973 }
974 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.application.data, real_length, read_callback_, decoder))
975 return false; /* the read_callback_ sets the state for us */
976 }
977 else
978 block.data.application.data = 0;
979 break;
980 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
981 if(!read_metadata_vorbiscomment_(decoder, &block.data.vorbis_comment))
982 return false;
983 break;
984 case FLAC__METADATA_TYPE_CUESHEET:
985 if(!read_metadata_cuesheet_(decoder, &block.data.cue_sheet))
986 return false;
987 break;
988 case FLAC__METADATA_TYPE_STREAMINFO:
989 case FLAC__METADATA_TYPE_SEEKTABLE:
990 FLAC__ASSERT(0);
991 break;
992 default:
993 if(real_length > 0) {
994 if(0 == (block.data.unknown.data = (FLAC__byte*)malloc(real_length))) {
995 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
996 return false;
997 }
998 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, block.data.unknown.data, real_length, read_callback_, decoder))
999 return false; /* the read_callback_ sets the state for us */
1000 }
1001 else
1002 block.data.unknown.data = 0;
1003 break;
1004 }
1005 decoder->private_->metadata_callback(decoder, &block, decoder->private_->client_data);
1006
1007 /* now we have to free any malloc'ed data in the block */
1008 switch(type) {
1009 case FLAC__METADATA_TYPE_PADDING:
1010 break;
1011 case FLAC__METADATA_TYPE_APPLICATION:
1012 if(0 != block.data.application.data)
1013 free(block.data.application.data);
1014 break;
1015 case FLAC__METADATA_TYPE_VORBIS_COMMENT:
1016 if(0 != block.data.vorbis_comment.vendor_string.entry)
1017 free(block.data.vorbis_comment.vendor_string.entry);
1018 if(block.data.vorbis_comment.num_comments > 0)
1019 for(i = 0; i < block.data.vorbis_comment.num_comments; i++)
1020 if(0 != block.data.vorbis_comment.comments[i].entry)
1021 free(block.data.vorbis_comment.comments[i].entry);
1022 if(0 != block.data.vorbis_comment.comments)
1023 free(block.data.vorbis_comment.comments);
1024 break;
1025 case FLAC__METADATA_TYPE_CUESHEET:
1026 if(block.data.cue_sheet.num_tracks > 0)
1027 for(i = 0; i < block.data.cue_sheet.num_tracks; i++)
1028 if(0 != block.data.cue_sheet.tracks[i].indices)
1029 free(block.data.cue_sheet.tracks[i].indices);
1030 if(0 != block.data.cue_sheet.tracks)
1031 free(block.data.cue_sheet.tracks);
1032 break;
1033 case FLAC__METADATA_TYPE_STREAMINFO:
1034 case FLAC__METADATA_TYPE_SEEKTABLE:
1035 FLAC__ASSERT(0);
1036 default:
1037 if(0 != block.data.unknown.data)
1038 free(block.data.unknown.data);
1039 break;
1040 }
1041 }
1042 }
1043
1044 if(is_last)
1045 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1046
1047 return true;
1048 }
1049
1050 FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1051 {
1052 FLAC__uint32 x;
1053 unsigned bits, used_bits = 0;
1054
1055 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1056
1057 decoder->private_->stream_info.type = FLAC__METADATA_TYPE_STREAMINFO;
1058 decoder->private_->stream_info.is_last = is_last;
1059 decoder->private_->stream_info.length = length;
1060
1061 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN;
1062 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, bits, read_callback_, decoder))
1063 return false; /* the read_callback_ sets the state for us */
1064 decoder->private_->stream_info.data.stream_info.min_blocksize = x;
1065 used_bits += bits;
1066
1067 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN;
1068 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN, read_callback_, decoder))
1069 return false; /* the read_callback_ sets the state for us */
1070 decoder->private_->stream_info.data.stream_info.max_blocksize = x;
1071 used_bits += bits;
1072
1073 bits = FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN;
1074 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN, read_callback_, decoder))
1075 return false; /* the read_callback_ sets the state for us */
1076 decoder->private_->stream_info.data.stream_info.min_framesize = x;
1077 used_bits += bits;
1078
1079 bits = FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN;
1080 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN, read_callback_, decoder))
1081 return false; /* the read_callback_ sets the state for us */
1082 decoder->private_->stream_info.data.stream_info.max_framesize = x;
1083 used_bits += bits;
1084
1085 bits = FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN;
1086 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN, read_callback_, decoder))
1087 return false; /* the read_callback_ sets the state for us */
1088 decoder->private_->stream_info.data.stream_info.sample_rate = x;
1089 used_bits += bits;
1090
1091 bits = FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN;
1092 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN, read_callback_, decoder))
1093 return false; /* the read_callback_ sets the state for us */
1094 decoder->private_->stream_info.data.stream_info.channels = x+1;
1095 used_bits += bits;
1096
1097 bits = FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN;
1098 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN, read_callback_, decoder))
1099 return false; /* the read_callback_ sets the state for us */
1100 decoder->private_->stream_info.data.stream_info.bits_per_sample = x+1;
1101 used_bits += bits;
1102
1103 bits = FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN;
1104 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &decoder->private_->stream_info.data.stream_info.total_samples, FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN, read_callback_, decoder))
1105 return false; /* the read_callback_ sets the state for us */
1106 used_bits += bits;
1107
1108 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, decoder->private_->stream_info.data.stream_info.md5sum, 16, read_callback_, decoder))
1109 return false; /* the read_callback_ sets the state for us */
1110 used_bits += 16*8;
1111
1112 /* skip the rest of the block */
1113 FLAC__ASSERT(used_bits % 8 == 0);
1114 length -= (used_bits / 8);
1115 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder))
1116 return false; /* the read_callback_ sets the state for us */
1117
1118 return true;
1119 }
1120
1121 FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length)
1122 {
1123 FLAC__uint32 i, x;
1124 FLAC__uint64 xx;
1125
1126 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1127
1128 decoder->private_->seek_table.type = FLAC__METADATA_TYPE_SEEKTABLE;
1129 decoder->private_->seek_table.is_last = is_last;
1130 decoder->private_->seek_table.length = length;
1131
1132 decoder->private_->seek_table.data.seek_table.num_points = length / FLAC__STREAM_METADATA_SEEKPOINT_LENGTH;
1133
1134 /* use realloc since we may pass through here several times (e.g. after seeking) */
1135 if(0 == (decoder->private_->seek_table.data.seek_table.points = (FLAC__StreamMetadata_SeekPoint*)realloc(decoder->private_->seek_table.data.seek_table.points, decoder->private_->seek_table.data.seek_table.num_points * sizeof(FLAC__StreamMetadata_SeekPoint)))) {
1136 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1137 return false;
1138 }
1139 for(i = 0; i < decoder->private_->seek_table.data.seek_table.num_points; i++) {
1140 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN, read_callback_, decoder))
1141 return false; /* the read_callback_ sets the state for us */
1142 decoder->private_->seek_table.data.seek_table.points[i].sample_number = xx;
1143
1144 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &xx, FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN, read_callback_, decoder))
1145 return false; /* the read_callback_ sets the state for us */
1146 decoder->private_->seek_table.data.seek_table.points[i].stream_offset = xx;
1147
1148 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN, read_callback_, decoder))
1149 return false; /* the read_callback_ sets the state for us */
1150 decoder->private_->seek_table.data.seek_table.points[i].frame_samples = x;
1151 }
1152 length -= (decoder->private_->seek_table.data.seek_table.num_points * FLAC__STREAM_METADATA_SEEKPOINT_LENGTH);
1153 /* if there is a partial point left, skip over it */
1154 if(length > 0) {
1155 /*@@@ do an error_callback() here? there's an argument for either way */
1156 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, length, read_callback_, decoder))
1157 return false; /* the read_callback_ sets the state for us */
1158 }
1159
1160 return true;
1161 }
1162
1163 FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj)
1164 {
1165 FLAC__uint32 i;
1166
1167 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1168
1169 /* read vendor string */
1170 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1171 if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->vendor_string.length, read_callback_, decoder))
1172 return false; /* the read_callback_ sets the state for us */
1173 if(obj->vendor_string.length > 0) {
1174 if(0 == (obj->vendor_string.entry = (FLAC__byte*)malloc(obj->vendor_string.length+1))) {
1175 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1176 return false;
1177 }
1178 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->vendor_string.entry, obj->vendor_string.length, read_callback_, decoder))
1179 return false; /* the read_callback_ sets the state for us */
1180 obj->vendor_string.entry[obj->vendor_string.length] = '\0';
1181 }
1182 else
1183 obj->vendor_string.entry = 0;
1184
1185 /* read num comments */
1186 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN == 32);
1187 if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->num_comments, read_callback_, decoder))
1188 return false; /* the read_callback_ sets the state for us */
1189
1190 /* read comments */
1191 if(obj->num_comments > 0) {
1192 if(0 == (obj->comments = (FLAC__StreamMetadata_VorbisComment_Entry*)malloc(obj->num_comments * sizeof(FLAC__StreamMetadata_VorbisComment_Entry)))) {
1193 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1194 return false;
1195 }
1196 for(i = 0; i < obj->num_comments; i++) {
1197 FLAC__ASSERT(FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN == 32);
1198 if(!FLAC__bitbuffer_read_raw_uint32_little_endian(decoder->private_->input, &obj->comments[i].length, read_callback_, decoder))
1199 return false; /* the read_callback_ sets the state for us */
1200 if(obj->comments[i].length > 0) {
1201 if(0 == (obj->comments[i].entry = (FLAC__byte*)malloc(obj->comments[i].length+1))) {
1202 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1203 return false;
1204 }
1205 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, obj->comments[i].entry, obj->comments[i].length, read_callback_, decoder))
1206 return false; /* the read_callback_ sets the state for us */
1207 obj->comments[i].entry[obj->comments[i].length] = '\0';
1208 }
1209 else
1210 obj->comments[i].entry = 0;
1211 }
1212 }
1213 else {
1214 obj->comments = 0;
1215 }
1216
1217 return true;
1218 }
1219
1220 FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj)
1221 {
1222 FLAC__uint32 i, j, x;
1223
1224 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1225
1226 memset(obj, 0, sizeof(FLAC__StreamMetadata_CueSheet));
1227
1228 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN % 8 == 0);
1229 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)obj->media_catalog_number, FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN/8, read_callback_, decoder))
1230 return false; /* the read_callback_ sets the state for us */
1231
1232 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &obj->lead_in, FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN, read_callback_, decoder))
1233 return false; /* the read_callback_ sets the state for us */
1234
1235 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN, read_callback_, decoder))
1236 return false; /* the read_callback_ sets the state for us */
1237 obj->is_cd = x? true : false;
1238
1239 if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN, read_callback_, decoder))
1240 return false; /* the read_callback_ sets the state for us */
1241
1242 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN, read_callback_, decoder))
1243 return false; /* the read_callback_ sets the state for us */
1244 obj->num_tracks = x;
1245
1246 if(obj->num_tracks > 0) {
1247 if(0 == (obj->tracks = (FLAC__StreamMetadata_CueSheet_Track*)calloc(obj->num_tracks, sizeof(FLAC__StreamMetadata_CueSheet_Track)))) {
1248 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1249 return false;
1250 }
1251 for(i = 0; i < obj->num_tracks; i++) {
1252 FLAC__StreamMetadata_CueSheet_Track *track = &obj->tracks[i];
1253 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &track->offset, FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN, read_callback_, decoder))
1254 return false; /* the read_callback_ sets the state for us */
1255
1256 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN, read_callback_, decoder))
1257 return false; /* the read_callback_ sets the state for us */
1258 track->number = (FLAC__byte)x;
1259
1260 FLAC__ASSERT(FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN % 8 == 0);
1261 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, (FLAC__byte*)track->isrc, FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN/8, read_callback_, decoder))
1262 return false; /* the read_callback_ sets the state for us */
1263
1264 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN, read_callback_, decoder))
1265 return false; /* the read_callback_ sets the state for us */
1266 track->type = x;
1267
1268 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN, read_callback_, decoder))
1269 return false; /* the read_callback_ sets the state for us */
1270 track->pre_emphasis = x;
1271
1272 if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN, read_callback_, decoder))
1273 return false; /* the read_callback_ sets the state for us */
1274
1275 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN, read_callback_, decoder))
1276 return false; /* the read_callback_ sets the state for us */
1277 track->num_indices = (FLAC__byte)x;
1278
1279 if(track->num_indices > 0) {
1280 if(0 == (track->indices = (FLAC__StreamMetadata_CueSheet_Index*)calloc(track->num_indices, sizeof(FLAC__StreamMetadata_CueSheet_Index)))) {
1281 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
1282 return false;
1283 }
1284 for(j = 0; j < track->num_indices; j++) {
1285 FLAC__StreamMetadata_CueSheet_Index *index = &track->indices[j];
1286 if(!FLAC__bitbuffer_read_raw_uint64(decoder->private_->input, &index->offset, FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN, read_callback_, decoder))
1287 return false; /* the read_callback_ sets the state for us */
1288
1289 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN, read_callback_, decoder))
1290 return false; /* the read_callback_ sets the state for us */
1291 index->number = (FLAC__byte)x;
1292
1293 if(!FLAC__bitbuffer_skip_bits_no_crc(decoder->private_->input, FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN, read_callback_, decoder))
1294 return false; /* the read_callback_ sets the state for us */
1295 }
1296 }
1297 }
1298 }
1299
1300 return true;
1301 }
1302
1303 FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder)
1304 {
1305 FLAC__uint32 x;
1306 unsigned i, skip;
1307
1308 /* skip the version and flags bytes */
1309 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 24, read_callback_, decoder))
1310 return false; /* the read_callback_ sets the state for us */
1311 /* get the size (in bytes) to skip */
1312 skip = 0;
1313 for(i = 0; i < 4; i++) {
1314 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1315 return false; /* the read_callback_ sets the state for us */
1316 skip <<= 7;
1317 skip |= (x & 0x7f);
1318 }
1319 /* skip the rest of the tag */
1320 if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, skip, read_callback_, decoder))
1321 return false; /* the read_callback_ sets the state for us */
1322 return true;
1323 }
1324
1325 FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder)
1326 {
1327 FLAC__uint32 x;
1328 FLAC__bool first = true;
1329
1330 /* If we know the total number of samples in the stream, stop if we've read that many. */
1331 /* This will stop us, for example, from wasting time trying to sync on an ID3V1 tag. */
1332 if(decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.total_samples) {
1333 if(decoder->private_->samples_decoded >= decoder->private_->stream_info.data.stream_info.total_samples) {
1334 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
1335 return true;
1336 }
1337 }
1338
1339 /* make sure we're byte aligned */
1340 if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
1341 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
1342 return false; /* the read_callback_ sets the state for us */
1343 }
1344
1345 while(1) {
1346 if(decoder->private_->cached) {
1347 x = (FLAC__uint32)decoder->private_->lookahead;
1348 decoder->private_->cached = false;
1349 }
1350 else {
1351 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1352 return false; /* the read_callback_ sets the state for us */
1353 }
1354 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1355 decoder->private_->header_warmup[0] = (FLAC__byte)x;
1356 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1357 return false; /* the read_callback_ sets the state for us */
1358
1359 /* we have to check if we just read two 0xff's in a row; the second may actually be the beginning of the sync code */
1360 /* else we have to check if the second byte is the end of a sync code */
1361 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1362 decoder->private_->lookahead = (FLAC__byte)x;
1363 decoder->private_->cached = true;
1364 }
1365 else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
1366 decoder->private_->header_warmup[1] = (FLAC__byte)x;
1367 decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
1368 return true;
1369 }
1370 }
1371 if(first) {
1372 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1373 first = false;
1374 }
1375 }
1376
1377 return true;
1378 }
1379
1380 FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame, FLAC__bool do_full_decode)
1381 {
1382 unsigned channel;
1383 unsigned i;
1384 FLAC__int32 mid, side, left, right;
1385 FLAC__uint16 frame_crc; /* the one we calculate from the input stream */
1386 FLAC__uint32 x;
1387
1388 *got_a_frame = false;
1389
1390 /* init the CRC */
1391 frame_crc = 0;
1392 FLAC__CRC16_UPDATE(decoder->private_->header_warmup[0], frame_crc);
1393 FLAC__CRC16_UPDATE(decoder->private_->header_warmup[1], frame_crc);
1394 FLAC__bitbuffer_reset_read_crc16(decoder->private_->input, frame_crc);
1395
1396 if(!read_frame_header_(decoder))
1397 return false;
1398 if(decoder->protected_->state == FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC)
1399 return true;
1400 if(!allocate_output_(decoder, decoder->private_->frame.header.blocksize, decoder->private_->frame.header.channels))
1401 return false;
1402 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1403 /*
1404 * first figure the correct bits-per-sample of the subframe
1405 */
1406 unsigned bps = decoder->private_->frame.header.bits_per_sample;
1407 switch(decoder->private_->frame.header.channel_assignment) {
1408 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1409 /* no adjustment needed */
1410 break;
1411 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1412 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1413 if(channel == 1)
1414 bps++;
1415 break;
1416 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1417 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1418 if(channel == 0)
1419 bps++;
1420 break;
1421 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1422 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1423 if(channel == 1)
1424 bps++;
1425 break;
1426 default:
1427 FLAC__ASSERT(0);
1428 }
1429 /*
1430 * now read it
1431 */
1432 if(!read_subframe_(decoder, channel, bps, do_full_decode))
1433 return false;
1434 if(decoder->protected_->state != FLAC__STREAM_DECODER_READ_FRAME) {
1435 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1436 return true;
1437 }
1438 }
1439 if(!read_zero_padding_(decoder))
1440 return false;
1441
1442 /*
1443 * Read the frame CRC-16 from the footer and check
1444 */
1445 frame_crc = FLAC__bitbuffer_get_read_crc16(decoder->private_->input);
1446 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__FRAME_FOOTER_CRC_LEN, read_callback_, decoder))
1447 return false; /* the read_callback_ sets the state for us */
1448 if(frame_crc == (FLAC__uint16)x) {
1449 if(do_full_decode) {
1450 /* Undo any special channel coding */
1451 switch(decoder->private_->frame.header.channel_assignment) {
1452 case FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT:
1453 /* do nothing */
1454 break;
1455 case FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE:
1456 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1457 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1458 decoder->private_->output[1][i] = decoder->private_->output[0][i] - decoder->private_->output[1][i];
1459 break;
1460 case FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE:
1461 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1462 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1463 decoder->private_->output[0][i] += decoder->private_->output[1][i];
1464 break;
1465 case FLAC__CHANNEL_ASSIGNMENT_MID_SIDE:
1466 FLAC__ASSERT(decoder->private_->frame.header.channels == 2);
1467 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
1468 mid = decoder->private_->output[0][i];
1469 side = decoder->private_->output[1][i];
1470 mid <<= 1;
1471 if(side & 1) /* i.e. if 'side' is odd... */
1472 mid++;
1473 left = mid + side;
1474 right = mid - side;
1475 decoder->private_->output[0][i] = left >> 1;
1476 decoder->private_->output[1][i] = right >> 1;
1477 }
1478 break;
1479 default:
1480 FLAC__ASSERT(0);
1481 break;
1482 }
1483 }
1484 }
1485 else {
1486 /* Bad frame, emit error and zero the output signal */
1487 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH, decoder->private_->client_data);
1488 if(do_full_decode) {
1489 for(channel = 0; channel < decoder->private_->frame.header.channels; channel++) {
1490 memset(decoder->private_->output[channel], 0, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
1491 }
1492 }
1493 }
1494
1495 *got_a_frame = true;
1496
1497 /* put the latest values into the public section of the decoder instance */
1498 decoder->protected_->channels = decoder->private_->frame.header.channels;
1499 decoder->protected_->channel_assignment = decoder->private_->frame.header.channel_assignment;
1500 decoder->protected_->bits_per_sample = decoder->private_->frame.header.bits_per_sample;
1501 decoder->protected_->sample_rate = decoder->private_->frame.header.sample_rate;
1502 decoder->protected_->blocksize = decoder->private_->frame.header.blocksize;
1503
1504 FLAC__ASSERT(decoder->private_->frame.header.number_type == FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER);
1505 decoder->private_->samples_decoded = decoder->private_->frame.header.number.sample_number + decoder->private_->frame.header.blocksize;
1506
1507 /* write it */
1508 if(do_full_decode) {
1509 if(decoder->private_->write_callback(decoder, &decoder->private_->frame, (const FLAC__int32 * const *)decoder->private_->output, decoder->private_->client_data) != FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE)
1510 return false;
1511 }
1512
1513 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1514 return true;
1515 }
1516
1517 FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder)
1518 {
1519 FLAC__uint32 x;
1520 FLAC__uint64 xx;
1521 unsigned i, blocksize_hint = 0, sample_rate_hint = 0;
1522 FLAC__byte crc8, raw_header[16]; /* MAGIC NUMBER based on the maximum frame header size, including CRC */
1523 unsigned raw_header_len;
1524 FLAC__bool is_unparseable = false;
1525 const FLAC__bool is_known_variable_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize != decoder->private_->stream_info.data.stream_info.max_blocksize);
1526 const FLAC__bool is_known_fixed_blocksize_stream = (decoder->private_->has_stream_info && decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize);
1527
1528 FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
1529
1530 /* init the raw header with the saved bits from synchronization */
1531 raw_header[0] = decoder->private_->header_warmup[0];
1532 raw_header[1] = decoder->private_->header_warmup[1];
1533 raw_header_len = 2;
1534
1535 /*
1536 * check to make sure that the reserved bits are 0
1537 */
1538 if(raw_header[1] & 0x03) { /* MAGIC NUMBER */
1539 is_unparseable = true;
1540 }
1541
1542 /*
1543 * Note that along the way as we read the header, we look for a sync
1544 * code inside. If we find one it would indicate that our original
1545 * sync was bad since there cannot be a sync code in a valid header.
1546 */
1547
1548 /*
1549 * read in the raw header as bytes so we can CRC it, and parse it on the way
1550 */
1551 for(i = 0; i < 2; i++) {
1552 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1553 return false; /* the read_callback_ sets the state for us */
1554 if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
1555 /* if we get here it means our original sync was erroneous since the sync code cannot appear in the header */
1556 decoder->private_->lookahead = (FLAC__byte)x;
1557 decoder->private_->cached = true;
1558 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1559 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1560 return true;
1561 }
1562 raw_header[raw_header_len++] = (FLAC__byte)x;
1563 }
1564
1565 switch(x = raw_header[2] >> 4) {
1566 case 0:
1567 if(is_known_fixed_blocksize_stream)
1568 decoder->private_->frame.header.blocksize = decoder->private_->stream_info.data.stream_info.min_blocksize;
1569 else
1570 is_unparseable = true;
1571 break;
1572 case 1:
1573 decoder->private_->frame.header.blocksize = 192;
1574 break;
1575 case 2:
1576 case 3:
1577 case 4:
1578 case 5:
1579 decoder->private_->frame.header.blocksize = 576 << (x-2);
1580 break;
1581 case 6:
1582 case 7:
1583 blocksize_hint = x;
1584 break;
1585 case 8:
1586 case 9:
1587 case 10:
1588 case 11:
1589 case 12:
1590 case 13:
1591 case 14:
1592 case 15:
1593 decoder->private_->frame.header.blocksize = 256 << (x-8);
1594 break;
1595 default:
1596 FLAC__ASSERT(0);
1597 break;
1598 }
1599
1600 switch(x = raw_header[2] & 0x0f) {
1601 case 0:
1602 if(decoder->private_->has_stream_info)
1603 decoder->private_->frame.header.sample_rate = decoder->private_->stream_info.data.stream_info.sample_rate;
1604 else
1605 is_unparseable = true;
1606 break;
1607 case 1:
1608 case 2:
1609 case 3:
1610 is_unparseable = true;
1611 break;
1612 case 4:
1613 decoder->private_->frame.header.sample_rate = 8000;
1614 break;
1615 case 5:
1616 decoder->private_->frame.header.sample_rate = 16000;
1617 break;
1618 case 6:
1619 decoder->private_->frame.header.sample_rate = 22050;
1620 break;
1621 case 7:
1622 decoder->private_->frame.header.sample_rate = 24000;
1623 break;
1624 case 8:
1625 decoder->private_->frame.header.sample_rate = 32000;
1626 break;
1627 case 9:
1628 decoder->private_->frame.header.sample_rate = 44100;
1629 break;
1630 case 10:
1631 decoder->private_->frame.header.sample_rate = 48000;
1632 break;
1633 case 11:
1634 decoder->private_->frame.header.sample_rate = 96000;
1635 break;
1636 case 12:
1637 case 13:
1638 case 14:
1639 sample_rate_hint = x;
1640 break;
1641 case 15:
1642 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1643 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1644 return true;
1645 default:
1646 FLAC__ASSERT(0);
1647 }
1648
1649 x = (unsigned)(raw_header[3] >> 4);
1650 if(x & 8) {
1651 decoder->private_->frame.header.channels = 2;
1652 switch(x & 7) {
1653 case 0:
1654 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_LEFT_SIDE;
1655 break;
1656 case 1:
1657 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_RIGHT_SIDE;
1658 break;
1659 case 2:
1660 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_MID_SIDE;
1661 break;
1662 default:
1663 is_unparseable = true;
1664 break;
1665 }
1666 }
1667 else {
1668 decoder->private_->frame.header.channels = (unsigned)x + 1;
1669 decoder->private_->frame.header.channel_assignment = FLAC__CHANNEL_ASSIGNMENT_INDEPENDENT;
1670 }
1671
1672 switch(x = (unsigned)(raw_header[3] & 0x0e) >> 1) {
1673 case 0:
1674 if(decoder->private_->has_stream_info)
1675 decoder->private_->frame.header.bits_per_sample = decoder->private_->stream_info.data.stream_info.bits_per_sample;
1676 else
1677 is_unparseable = true;
1678 break;
1679 case 1:
1680 decoder->private_->frame.header.bits_per_sample = 8;
1681 break;
1682 case 2:
1683 decoder->private_->frame.header.bits_per_sample = 12;
1684 break;
1685 case 4:
1686 decoder->private_->frame.header.bits_per_sample = 16;
1687 break;
1688 case 5:
1689 decoder->private_->frame.header.bits_per_sample = 20;
1690 break;
1691 case 6:
1692 decoder->private_->frame.header.bits_per_sample = 24;
1693 break;
1694 case 3:
1695 case 7:
1696 is_unparseable = true;
1697 break;
1698 default:
1699 FLAC__ASSERT(0);
1700 break;
1701 }
1702
1703 if(raw_header[3] & 0x01) { /* this should be a zero padding bit */
1704 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1705 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1706 return true;
1707 }
1708
1709 /*
1710 * Now we get to the regrettable consequences of not knowing for sure
1711 * whether we got a frame number or a sample number. There are no
1712 * encoders that do variable-blocksize encoding so unless we know from
1713 * the STREAMINFO that it is variable-blocksize we will assume it is
1714 * fixed-blocksize. The trouble comes when we have no STREAMINFO; again
1715 * we will guess that is fixed-blocksize. Where this can go wrong: 1) a
1716 * variable-blocksize stream with no STREAMINFO; 2) a fixed-blocksize
1717 * stream that was edited such that one or more frames before or
1718 * including this one do not have the same number of samples as the
1719 * STREAMINFO's min and max blocksize.
1720 */
1721 if(is_known_variable_blocksize_stream) {
1722 if(blocksize_hint) {
1723 if(!FLAC__bitbuffer_read_utf8_uint64(decoder->private_->input, &xx, read_callback_, decoder, raw_header, &raw_header_len))
1724 return false; /* the read_callback_ sets the state for us */
1725 if(xx == FLAC__U64L(0xffffffffffffffff)) { /* i.e. non-UTF8 code... */
1726 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1727 decoder->private_->cached = true;
1728 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1729 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1730 return true;
1731 }
1732 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1733 decoder->private_->frame.header.number.sample_number = xx;
1734 }
1735 else
1736 is_unparseable = true;
1737 }
1738 else {
1739 if(!FLAC__bitbuffer_read_utf8_uint32(decoder->private_->input, &x, read_callback_, decoder, raw_header, &raw_header_len))
1740 return false; /* the read_callback_ sets the state for us */
1741 if(x == 0xffffffff) { /* i.e. non-UTF8 code... */
1742 decoder->private_->lookahead = raw_header[raw_header_len-1]; /* back up as much as we can */
1743 decoder->private_->cached = true;
1744 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1745 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1746 return true;
1747 }
1748 decoder->private_->last_frame_number = x;
1749 decoder->private_->frame.header.number_type = FLAC__FRAME_NUMBER_TYPE_SAMPLE_NUMBER;
1750 if(decoder->private_->has_stream_info) {
1751 FLAC__ASSERT(decoder->private_->stream_info.data.stream_info.min_blocksize == decoder->private_->stream_info.data.stream_info.max_blocksize);
1752 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->stream_info.data.stream_info.min_blocksize * (FLAC__uint64)x;
1753 decoder->private_->last_block_size = decoder->private_->frame.header.blocksize;
1754 }
1755 else if(blocksize_hint) {
1756 if(decoder->private_->last_block_size)
1757 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->last_block_size * (FLAC__uint64)x;
1758 else
1759 is_unparseable = true;
1760 }
1761 else {
1762 decoder->private_->frame.header.number.sample_number = (FLAC__uint64)decoder->private_->frame.header.blocksize * (FLAC__uint64)x;
1763 decoder->private_->last_block_size = decoder->private_->frame.header.blocksize;
1764 }
1765 }
1766
1767 if(blocksize_hint) {
1768 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1769 return false; /* the read_callback_ sets the state for us */
1770 raw_header[raw_header_len++] = (FLAC__byte)x;
1771 if(blocksize_hint == 7) {
1772 FLAC__uint32 _x;
1773 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1774 return false; /* the read_callback_ sets the state for us */
1775 raw_header[raw_header_len++] = (FLAC__byte)_x;
1776 x = (x << 8) | _x;
1777 }
1778 decoder->private_->frame.header.blocksize = x+1;
1779 }
1780
1781 if(sample_rate_hint) {
1782 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1783 return false; /* the read_callback_ sets the state for us */
1784 raw_header[raw_header_len++] = (FLAC__byte)x;
1785 if(sample_rate_hint != 12) {
1786 FLAC__uint32 _x;
1787 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &_x, 8, read_callback_, decoder))
1788 return false; /* the read_callback_ sets the state for us */
1789 raw_header[raw_header_len++] = (FLAC__byte)_x;
1790 x = (x << 8) | _x;
1791 }
1792 if(sample_rate_hint == 12)
1793 decoder->private_->frame.header.sample_rate = x*1000;
1794 else if(sample_rate_hint == 13)
1795 decoder->private_->frame.header.sample_rate = x;
1796 else
1797 decoder->private_->frame.header.sample_rate = x*10;
1798 }
1799
1800 /* read the CRC-8 byte */
1801 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
1802 return false; /* the read_callback_ sets the state for us */
1803 crc8 = (FLAC__byte)x;
1804
1805 if(FLAC__crc8(raw_header, raw_header_len) != crc8) {
1806 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER, decoder->private_->client_data);
1807 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1808 return true;
1809 }
1810
1811 if(is_unparseable) {
1812 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1813 return false;
1814 }
1815
1816 return true;
1817 }
1818
1819 FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
1820 {
1821 FLAC__uint32 x;
1822 FLAC__bool wasted_bits;
1823
1824 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder)) /* MAGIC NUMBER */
1825 return false; /* the read_callback_ sets the state for us */
1826
1827 wasted_bits = (x & 1);
1828 x &= 0xfe;
1829
1830 if(wasted_bits) {
1831 unsigned u;
1832 if(!FLAC__bitbuffer_read_unary_unsigned(decoder->private_->input, &u, read_callback_, decoder))
1833 return false; /* the read_callback_ sets the state for us */
1834 decoder->private_->frame.subframes[channel].wasted_bits = u+1;
1835 bps -= decoder->private_->frame.subframes[channel].wasted_bits;
1836 }
1837 else
1838 decoder->private_->frame.subframes[channel].wasted_bits = 0;
1839
1840 /*
1841 * Lots of magic numbers here
1842 */
1843 if(x & 0x80) {
1844 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1845 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1846 return true;
1847 }
1848 else if(x == 0) {
1849 if(!read_subframe_constant_(decoder, channel, bps, do_full_decode))
1850 return false;
1851 }
1852 else if(x == 2) {
1853 if(!read_subframe_verbatim_(decoder, channel, bps, do_full_decode))
1854 return false;
1855 }
1856 else if(x < 16) {
1857 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1858 return false;
1859 }
1860 else if(x <= 24) {
1861 if(!read_subframe_fixed_(decoder, channel, bps, (x>>1)&7, do_full_decode))
1862 return false;
1863 }
1864 else if(x < 64) {
1865 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1866 return false;
1867 }
1868 else {
1869 if(!read_subframe_lpc_(decoder, channel, bps, ((x>>1)&31)+1, do_full_decode))
1870 return false;
1871 }
1872
1873 if(wasted_bits && do_full_decode) {
1874 unsigned i;
1875 x = decoder->private_->frame.subframes[channel].wasted_bits;
1876 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1877 decoder->private_->output[channel][i] <<= x;
1878 }
1879
1880 return true;
1881 }
1882
1883 FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
1884 {
1885 FLAC__Subframe_Constant *subframe = &decoder->private_->frame.subframes[channel].data.constant;
1886 FLAC__int32 x;
1887 unsigned i;
1888 FLAC__int32 *output = decoder->private_->output[channel];
1889
1890 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_CONSTANT;
1891
1892 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
1893 return false; /* the read_callback_ sets the state for us */
1894
1895 subframe->value = x;
1896
1897 /* decode the subframe */
1898 if(do_full_decode) {
1899 for(i = 0; i < decoder->private_->frame.header.blocksize; i++)
1900 output[i] = x;
1901 }
1902
1903 return true;
1904 }
1905
1906 FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
1907 {
1908 FLAC__Subframe_Fixed *subframe = &decoder->private_->frame.subframes[channel].data.fixed;
1909 FLAC__int32 i32;
1910 FLAC__uint32 u32;
1911 unsigned u;
1912
1913 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_FIXED;
1914
1915 subframe->residual = decoder->private_->residual[channel];
1916 subframe->order = order;
1917
1918 /* read warm-up samples */
1919 for(u = 0; u < order; u++) {
1920 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1921 return false; /* the read_callback_ sets the state for us */
1922 subframe->warmup[u] = i32;
1923 }
1924
1925 /* read entropy coding method info */
1926 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
1927 return false; /* the read_callback_ sets the state for us */
1928 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
1929 switch(subframe->entropy_coding_method.type) {
1930 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1931 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
1932 return false; /* the read_callback_ sets the state for us */
1933 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
1934 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
1935 break;
1936 default:
1937 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
1938 return false;
1939 }
1940
1941 /* read residual */
1942 switch(subframe->entropy_coding_method.type) {
1943 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
1944 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel]))
1945 return false;
1946 break;
1947 default:
1948 FLAC__ASSERT(0);
1949 }
1950
1951 /* decode the subframe */
1952 if(do_full_decode) {
1953 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
1954 FLAC__fixed_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, order, decoder->private_->output[channel]+order);
1955 }
1956
1957 return true;
1958 }
1959
1960 FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order, FLAC__bool do_full_decode)
1961 {
1962 FLAC__Subframe_LPC *subframe = &decoder->private_->frame.subframes[channel].data.lpc;
1963 FLAC__int32 i32;
1964 FLAC__uint32 u32;
1965 unsigned u;
1966
1967 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_LPC;
1968
1969 subframe->residual = decoder->private_->residual[channel];
1970 subframe->order = order;
1971
1972 /* read warm-up samples */
1973 for(u = 0; u < order; u++) {
1974 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, bps, read_callback_, decoder))
1975 return false; /* the read_callback_ sets the state for us */
1976 subframe->warmup[u] = i32;
1977 }
1978
1979 /* read qlp coeff precision */
1980 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN, read_callback_, decoder))
1981 return false; /* the read_callback_ sets the state for us */
1982 if(u32 == (1u << FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN) - 1) {
1983 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
1984 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
1985 return true;
1986 }
1987 subframe->qlp_coeff_precision = u32+1;
1988
1989 /* read qlp shift */
1990 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN, read_callback_, decoder))
1991 return false; /* the read_callback_ sets the state for us */
1992 subframe->quantization_level = i32;
1993
1994 /* read quantized lp coefficiencts */
1995 for(u = 0; u < order; u++) {
1996 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i32, subframe->qlp_coeff_precision, read_callback_, decoder))
1997 return false; /* the read_callback_ sets the state for us */
1998 subframe->qlp_coeff[u] = i32;
1999 }
2000
2001 /* read entropy coding method info */
2002 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_TYPE_LEN, read_callback_, decoder))
2003 return false; /* the read_callback_ sets the state for us */
2004 subframe->entropy_coding_method.type = (FLAC__EntropyCodingMethodType)u32;
2005 switch(subframe->entropy_coding_method.type) {
2006 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2007 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &u32, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN, read_callback_, decoder))
2008 return false; /* the read_callback_ sets the state for us */
2009 subframe->entropy_coding_method.data.partitioned_rice.order = u32;
2010 subframe->entropy_coding_method.data.partitioned_rice.contents = &decoder->private_->partitioned_rice_contents[channel];
2011 break;
2012 default:
2013 decoder->protected_->state = FLAC__STREAM_DECODER_UNPARSEABLE_STREAM;
2014 return false;
2015 }
2016
2017 /* read residual */
2018 switch(subframe->entropy_coding_method.type) {
2019 case FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE:
2020 if(!read_residual_partitioned_rice_(decoder, order, subframe->entropy_coding_method.data.partitioned_rice.order, &decoder->private_->partitioned_rice_contents[channel], decoder->private_->residual[channel]))
2021 return false;
2022 break;
2023 default:
2024 FLAC__ASSERT(0);
2025 }
2026
2027 /* decode the subframe */
2028 if(do_full_decode) {
2029 memcpy(decoder->private_->output[channel], subframe->warmup, sizeof(FLAC__int32) * order);
2030 if(bps + subframe->qlp_coeff_precision + FLAC__bitmath_ilog2(order) <= 32)
2031 if(bps <= 16 && subframe->qlp_coeff_precision <= 16) {
2032 if(order <= 8)
2033 decoder->private_->local_lpc_restore_signal_16bit_order8(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2034 else
2035 decoder->private_->local_lpc_restore_signal_16bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2036 }
2037 else
2038 decoder->private_->local_lpc_restore_signal(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2039 else
2040 decoder->private_->local_lpc_restore_signal_64bit(decoder->private_->residual[channel], decoder->private_->frame.header.blocksize-order, subframe->qlp_coeff, order, subframe->quantization_level, decoder->private_->output[channel]+order);
2041 }
2042
2043 return true;
2044 }
2045
2046 FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, FLAC__bool do_full_decode)
2047 {
2048 FLAC__Subframe_Verbatim *subframe = &decoder->private_->frame.subframes[channel].data.verbatim;
2049 FLAC__int32 x, *residual = decoder->private_->residual[channel];
2050 unsigned i;
2051
2052 decoder->private_->frame.subframes[channel].type = FLAC__SUBFRAME_TYPE_VERBATIM;
2053
2054 subframe->data = residual;
2055
2056 for(i = 0; i < decoder->private_->frame.header.blocksize; i++) {
2057 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &x, bps, read_callback_, decoder))
2058 return false; /* the read_callback_ sets the state for us */
2059 residual[i] = x;
2060 }
2061
2062 /* decode the subframe */
2063 if(do_full_decode)
2064 memcpy(decoder->private_->output[channel], subframe->data, sizeof(FLAC__int32) * decoder->private_->frame.header.blocksize);
2065
2066 return true;
2067 }
2068
2069 FLAC__bool read_residual_partitioned_rice_(FLAC__StreamDecoder *decoder, unsigned predictor_order, unsigned partition_order, FLAC__EntropyCodingMethod_PartitionedRiceContents *partitioned_rice_contents, FLAC__int32 *residual)
2070 {
2071 FLAC__uint32 rice_parameter;
2072 int i;
2073 unsigned partition, sample, u;
2074 const unsigned partitions = 1u << partition_order;
2075 const unsigned partition_samples = partition_order > 0? decoder->private_->frame.header.blocksize >> partition_order : decoder->private_->frame.header.blocksize - predictor_order;
2076
2077 /* sanity checks */
2078 if(partition_order == 0) {
2079 if(decoder->private_->frame.header.blocksize < predictor_order) {
2080 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
2081 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2082 return true;
2083 }
2084 }
2085 else {
2086 if(partition_samples < predictor_order) {
2087 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
2088 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2089 return true;
2090 }
2091 }
2092
2093 if(!FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(partitioned_rice_contents, max(6, partition_order))) {
2094 decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
2095 return false;
2096 }
2097
2098 sample = 0;
2099 for(partition = 0; partition < partitions; partition++) {
2100 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN, read_callback_, decoder))
2101 return false; /* the read_callback_ sets the state for us */
2102 partitioned_rice_contents->parameters[partition] = rice_parameter;
2103 if(rice_parameter < FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER) {
2104 #ifdef FLAC__SYMMETRIC_RICE
2105 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2106 if(!FLAC__bitbuffer_read_symmetric_rice_signed(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
2107 return false; /* the read_callback_ sets the state for us */
2108 residual[sample] = i;
2109 }
2110 #else
2111 u = (partition_order == 0 || partition > 0)? partition_samples : partition_samples - predictor_order;
2112 if(!FLAC__bitbuffer_read_rice_signed_block(decoder->private_->input, residual + sample, u, rice_parameter, read_callback_, decoder))
2113 return false; /* the read_callback_ sets the state for us */
2114 sample += u;
2115 #endif
2116 }
2117 else {
2118 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &rice_parameter, FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN, read_callback_, decoder))
2119 return false; /* the read_callback_ sets the state for us */
2120 partitioned_rice_contents->raw_bits[partition] = rice_parameter;
2121 for(u = (partition_order == 0 || partition > 0)? 0 : predictor_order; u < partition_samples; u++, sample++) {
2122 if(!FLAC__bitbuffer_read_raw_int32(decoder->private_->input, &i, rice_parameter, read_callback_, decoder))
2123 return false; /* the read_callback_ sets the state for us */
2124 residual[sample] = i;
2125 }
2126 }
2127 }
2128
2129 return true;
2130 }
2131
2132 FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder)
2133 {
2134 if(!FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input)) {
2135 FLAC__uint32 zero = 0;
2136 if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &zero, FLAC__bitbuffer_bits_left_for_byte_alignment(decoder->private_->input), read_callback_, decoder))
2137 return false; /* the read_callback_ sets the state for us */
2138 if(zero != 0) {
2139 decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
2140 decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
2141 }
2142 }
2143 return true;
2144 }
2145
2146 FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data)
2147 {
2148 FLAC__StreamDecoder *decoder = (FLAC__StreamDecoder *)client_data;
2149 FLAC__StreamDecoderReadStatus status;
2150
2151 status = decoder->private_->read_callback(decoder, buffer, bytes, decoder->private_->client_data);
2152 if(status == FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM)
2153 decoder->protected_->state = FLAC__STREAM_DECODER_END_OF_STREAM;
2154 else if(status == FLAC__STREAM_DECODER_READ_STATUS_ABORT)
2155 decoder->protected_->state = FLAC__STREAM_DECODER_ABORTED;
2156 return status == FLAC__STREAM_DECODER_READ_STATUS_CONTINUE;
2157 }