stream_decoder.c 78.2 KB
Newer Older
1
/* libFLAC - Free Lossless Audio Codec library
Josh Coalson's avatar
Josh Coalson committed
2
 * Copyright (C) 2000,2001,2002,2003  Josh Coalson
Josh Coalson's avatar
Josh Coalson committed
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Library General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Library General Public License for more details.
 *
 * You should have received a copy of the GNU Library General Public
 * License along with this library; if not, write to the
 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
 * Boston, MA  02111-1307, USA.
 */

#include <stdio.h>
#include <stdlib.h> /* for malloc() */
Josh Coalson's avatar
Josh Coalson committed
22
#include <string.h> /* for memset/memcpy() */
23
#include "FLAC/assert.h"
24
#include "protected/stream_decoder.h"
Josh Coalson's avatar
Josh Coalson committed
25
#include "private/bitbuffer.h"
Josh Coalson's avatar
Josh Coalson committed
26
#include "private/bitmath.h"
27
#include "private/cpu.h"
Josh Coalson's avatar
Josh Coalson committed
28
29
#include "private/crc.h"
#include "private/fixed.h"
30
#include "private/format.h"
Josh Coalson's avatar
Josh Coalson committed
31
32
#include "private/lpc.h"

Josh Coalson's avatar
Josh Coalson committed
33
34
35
36
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

37
38
39
40
41
#ifdef max
#undef max
#endif
#define max(a,b) ((a)>(b)?(a):(b))

42
43
44
45
46
47
/***********************************************************************
 *
 * Private static data
 *
 ***********************************************************************/

Josh Coalson's avatar
Josh Coalson committed
48
static FLAC__byte ID3V2_TAG_[3] = { 'I', 'D', '3' };
49
50
51
52
53
54
55

/***********************************************************************
 *
 * Private class method prototypes
 *
 ***********************************************************************/

Josh Coalson's avatar
Josh Coalson committed
56
57
58
59
60
static void set_defaults_(FLAC__StreamDecoder *decoder);
static FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels);
static FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id);
static FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder);
61
62
63
static FLAC__bool read_metadata_streaminfo_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
static FLAC__bool read_metadata_seektable_(FLAC__StreamDecoder *decoder, FLAC__bool is_last, unsigned length);
static FLAC__bool read_metadata_vorbiscomment_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_VorbisComment *obj);
64
static FLAC__bool read_metadata_cuesheet_(FLAC__StreamDecoder *decoder, FLAC__StreamMetadata_CueSheet *obj);
Josh Coalson's avatar
Josh Coalson committed
65
66
67
68
69
70
71
72
73
static FLAC__bool skip_id3v2_tag_(FLAC__StreamDecoder *decoder);
static FLAC__bool frame_sync_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_frame_(FLAC__StreamDecoder *decoder, FLAC__bool *got_a_frame);
static FLAC__bool read_frame_header_(FLAC__StreamDecoder *decoder);
static FLAC__bool read_subframe_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
static FLAC__bool read_subframe_constant_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
static FLAC__bool read_subframe_fixed_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
static FLAC__bool read_subframe_lpc_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps, const unsigned order);
static FLAC__bool read_subframe_verbatim_(FLAC__StreamDecoder *decoder, unsigned channel, unsigned bps);
74
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);
Josh Coalson's avatar
Josh Coalson committed
75
static FLAC__bool read_zero_padding_(FLAC__StreamDecoder *decoder);
Josh Coalson's avatar
Josh Coalson committed
76
static FLAC__bool read_callback_(FLAC__byte buffer[], unsigned *bytes, void *client_data);
77
78
79
80
81
82
83

/***********************************************************************
 *
 * Private class data
 *
 ***********************************************************************/

Josh Coalson's avatar
Josh Coalson committed
84
typedef struct FLAC__StreamDecoderPrivate {
Josh Coalson's avatar
Josh Coalson committed
85
86
87
88
	FLAC__StreamDecoderReadCallback read_callback;
	FLAC__StreamDecoderWriteCallback write_callback;
	FLAC__StreamDecoderMetadataCallback metadata_callback;
	FLAC__StreamDecoderErrorCallback error_callback;
Josh Coalson's avatar
Josh Coalson committed
89
	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[]);
90
	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[]);
Josh Coalson's avatar
Josh Coalson committed
91
	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[]);
Josh Coalson's avatar
Josh Coalson committed
92
	void *client_data;
93
	FLAC__BitBuffer *input;
Josh Coalson's avatar
Josh Coalson committed
94
95
	FLAC__int32 *output[FLAC__MAX_CHANNELS];
	FLAC__int32 *residual[FLAC__MAX_CHANNELS];
96
	FLAC__EntropyCodingMethod_PartitionedRiceContents partitioned_rice_contents[FLAC__MAX_CHANNELS];
97
	unsigned output_capacity, output_channels;
Josh Coalson's avatar
Josh Coalson committed
98
99
100
	FLAC__uint32 last_frame_number;
	FLAC__uint64 samples_decoded;
	FLAC__bool has_stream_info, has_seek_table;
101
102
	FLAC__StreamMetadata stream_info;
	FLAC__StreamMetadata seek_table;
103
	FLAC__bool metadata_filter[128]; /* MAGIC number 128 == total number of metadata block types == 1 << 7 */
104
105
	FLAC__byte *metadata_filter_ids;
	unsigned metadata_filter_ids_count, metadata_filter_ids_capacity; /* units for both are IDs, not bytes */
106
	FLAC__Frame frame;
Josh Coalson's avatar
Josh Coalson committed
107
	FLAC__bool cached; /* true if there is a byte in lookahead */
108
	FLAC__CPUInfo cpuinfo;
Josh Coalson's avatar
Josh Coalson committed
109
110
	FLAC__byte header_warmup[2]; /* contains the sync code and reserved bits */
	FLAC__byte lookahead; /* temp storage when we need to look ahead one byte in the stream */
Josh Coalson's avatar
Josh Coalson committed
111
112
} FLAC__StreamDecoderPrivate;

113
114
115
116
117
/***********************************************************************
 *
 * Public static class data
 *
 ***********************************************************************/
Josh Coalson's avatar
Josh Coalson committed
118

119
FLAC_API const char * const FLAC__StreamDecoderStateString[] = {
Josh Coalson's avatar
Josh Coalson committed
120
121
122
123
124
125
126
127
	"FLAC__STREAM_DECODER_SEARCH_FOR_METADATA",
	"FLAC__STREAM_DECODER_READ_METADATA",
	"FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC",
	"FLAC__STREAM_DECODER_READ_FRAME",
	"FLAC__STREAM_DECODER_END_OF_STREAM",
	"FLAC__STREAM_DECODER_ABORTED",
	"FLAC__STREAM_DECODER_UNPARSEABLE_STREAM",
	"FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR",
128
	"FLAC__STREAM_DECODER_ALREADY_INITIALIZED",
129
	"FLAC__STREAM_DECODER_INVALID_CALLBACK",
Josh Coalson's avatar
Josh Coalson committed
130
131
132
	"FLAC__STREAM_DECODER_UNINITIALIZED"
};

133
FLAC_API const char * const FLAC__StreamDecoderReadStatusString[] = {
134
135
136
	"FLAC__STREAM_DECODER_READ_STATUS_CONTINUE",
	"FLAC__STREAM_DECODER_READ_STATUS_END_OF_STREAM",
	"FLAC__STREAM_DECODER_READ_STATUS_ABORT"
Josh Coalson's avatar
Josh Coalson committed
137
138
};

139
FLAC_API const char * const FLAC__StreamDecoderWriteStatusString[] = {
140
141
	"FLAC__STREAM_DECODER_WRITE_STATUS_CONTINUE",
	"FLAC__STREAM_DECODER_WRITE_STATUS_ABORT"
Josh Coalson's avatar
Josh Coalson committed
142
143
};

144
FLAC_API const char * const FLAC__StreamDecoderErrorStatusString[] = {
145
146
147
	"FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC",
	"FLAC__STREAM_DECODER_ERROR_STATUS_BAD_HEADER",
	"FLAC__STREAM_DECODER_ERROR_STATUS_FRAME_CRC_MISMATCH"
Josh Coalson's avatar
Josh Coalson committed
148
149
};

150
151
152
153
154
/***********************************************************************
 *
 * Class constructor/destructor
 *
 ***********************************************************************/
155
FLAC_API FLAC__StreamDecoder *FLAC__stream_decoder_new()
Josh Coalson's avatar
Josh Coalson committed
156
{
157
	FLAC__StreamDecoder *decoder;
158
	unsigned i;
159
160
161

	FLAC__ASSERT(sizeof(int) >= 4); /* we want to die right away if this is not true */

162
	decoder = (FLAC__StreamDecoder*)calloc(1, sizeof(FLAC__StreamDecoder));
163
164
	if(decoder == 0) {
		return 0;
Josh Coalson's avatar
Josh Coalson committed
165
	}
Josh Coalson's avatar
Josh Coalson committed
166

167
	decoder->protected_ = (FLAC__StreamDecoderProtected*)calloc(1, sizeof(FLAC__StreamDecoderProtected));
168
	if(decoder->protected_ == 0) {
169
170
171
		free(decoder);
		return 0;
	}
Josh Coalson's avatar
Josh Coalson committed
172

173
	decoder->private_ = (FLAC__StreamDecoderPrivate*)calloc(1, sizeof(FLAC__StreamDecoderPrivate));
174
175
	if(decoder->private_ == 0) {
		free(decoder->protected_);
176
177
178
		free(decoder);
		return 0;
	}
Josh Coalson's avatar
Josh Coalson committed
179

180
181
182
183
184
185
186
	decoder->private_->input = FLAC__bitbuffer_new();
	if(decoder->private_->input == 0) {
		free(decoder->private_);
		free(decoder->protected_);
		free(decoder);
		return 0;
	}
187

188
	decoder->private_->metadata_filter_ids_capacity = 16;
Josh Coalson's avatar
Josh Coalson committed
189
	if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)malloc((FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8) * decoder->private_->metadata_filter_ids_capacity))) {
190
191
192
193
194
195
		FLAC__bitbuffer_delete(decoder->private_->input);
		free(decoder->private_);
		free(decoder->protected_);
		free(decoder);
		return 0;
	}
196

197
198
199
200
201
202
203
204
	for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
		decoder->private_->output[i] = 0;
		decoder->private_->residual[i] = 0;
	}

	decoder->private_->output_capacity = 0;
	decoder->private_->output_channels = 0;
	decoder->private_->has_seek_table = false;
205
206
207

	for(i = 0; i < FLAC__MAX_CHANNELS; i++)
		FLAC__format_entropy_coding_method_partitioned_rice_contents_init(&decoder->private_->partitioned_rice_contents[i]);
208

Josh Coalson's avatar
Josh Coalson committed
209
	set_defaults_(decoder);
210

211
212
	decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;

Josh Coalson's avatar
Josh Coalson committed
213
214
215
	return decoder;
}

216
FLAC_API void FLAC__stream_decoder_delete(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
217
{
218
219
	unsigned i;

Josh Coalson's avatar
Josh Coalson committed
220
221
222
223
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->private_->input);
224

225
226
	FLAC__stream_decoder_finish(decoder);

Josh Coalson's avatar
Josh Coalson committed
227
	if(0 != decoder->private_->metadata_filter_ids)
228
229
		free(decoder->private_->metadata_filter_ids);

230
	FLAC__bitbuffer_delete(decoder->private_->input);
231

232
233
	for(i = 0; i < FLAC__MAX_CHANNELS; i++)
		FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(&decoder->private_->partitioned_rice_contents[i]);
234

235
236
	free(decoder->private_);
	free(decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
237
238
239
	free(decoder);
}

240
241
242
243
244
245
/***********************************************************************
 *
 * Public class methods
 *
 ***********************************************************************/

246
FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_init(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
247
{
Josh Coalson's avatar
Josh Coalson committed
248
	FLAC__ASSERT(0 != decoder);
Josh Coalson's avatar
Josh Coalson committed
249

250
251
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return decoder->protected_->state = FLAC__STREAM_DECODER_ALREADY_INITIALIZED;
Josh Coalson's avatar
Josh Coalson committed
252

253
254
	if(0 == decoder->private_->read_callback || 0 == decoder->private_->write_callback || 0 == decoder->private_->metadata_callback || 0 == decoder->private_->error_callback)
		return decoder->protected_->state = FLAC__STREAM_DECODER_INVALID_CALLBACK;
Josh Coalson's avatar
Josh Coalson committed
255

256
257
	if(!FLAC__bitbuffer_init(decoder->private_->input))
		return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
Josh Coalson's avatar
Josh Coalson committed
258

259
260
261
262
	decoder->private_->last_frame_number = 0;
	decoder->private_->samples_decoded = 0;
	decoder->private_->has_stream_info = false;
	decoder->private_->cached = false;
Josh Coalson's avatar
Josh Coalson committed
263

264
265
266
	/*
	 * get the CPU info and set the function pointers
	 */
267
	FLAC__cpu_info(&decoder->private_->cpuinfo);
268
	/* first default to the non-asm routines */
269
	decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal;
270
	decoder->private_->local_lpc_restore_signal_64bit = FLAC__lpc_restore_signal_wide;
271
	decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal;
272
	/* now override with asm where appropriate */
273
#ifndef FLAC__NO_ASM
274
	if(decoder->private_->cpuinfo.use_asm) {
275
#ifdef FLAC__CPU_IA32
276
		FLAC__ASSERT(decoder->private_->cpuinfo.type == FLAC__CPUINFO_TYPE_IA32);
277
#ifdef FLAC__HAS_NASM
278
279
280
		if(decoder->private_->cpuinfo.data.ia32.mmx) {
			decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
			decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32_mmx;
281
282
		}
		else {
283
284
			decoder->private_->local_lpc_restore_signal = FLAC__lpc_restore_signal_asm_ia32;
			decoder->private_->local_lpc_restore_signal_16bit = FLAC__lpc_restore_signal_asm_ia32;
285
		}
286
#endif
287
#endif
288
	}
289
290
#endif

Josh Coalson's avatar
Josh Coalson committed
291
292
293
294
	if(!FLAC__stream_decoder_reset(decoder))
		return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;

	return decoder->protected_->state;
Josh Coalson's avatar
Josh Coalson committed
295
296
}

297
FLAC_API void FLAC__stream_decoder_finish(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
298
299
{
	unsigned i;
Josh Coalson's avatar
Josh Coalson committed
300
	FLAC__ASSERT(0 != decoder);
301
	if(decoder->protected_->state == FLAC__STREAM_DECODER_UNINITIALIZED)
Josh Coalson's avatar
Josh Coalson committed
302
		return;
303
	if(0 != decoder->private_->seek_table.data.seek_table.points) {
304
305
		free(decoder->private_->seek_table.data.seek_table.points);
		decoder->private_->seek_table.data.seek_table.points = 0;
306
		decoder->private_->has_seek_table = false;
307
	}
308
	FLAC__bitbuffer_free(decoder->private_->input);
309
	for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
310
311
312
313
314
315
		/* WATCHOUT:
		 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
		 * output arrays have a buffer of up to 3 zeroes in front
		 * (at negative indices) for alignment purposes; we use 4
		 * to keep the data well-aligned.
		 */
Josh Coalson's avatar
Josh Coalson committed
316
		if(0 != decoder->private_->output[i]) {
317
318
			free(decoder->private_->output[i]-4);
			decoder->private_->output[i] = 0;
319
		}
Josh Coalson's avatar
Josh Coalson committed
320
		if(0 != decoder->private_->residual[i]) {
321
322
			free(decoder->private_->residual[i]);
			decoder->private_->residual[i] = 0;
Josh Coalson's avatar
Josh Coalson committed
323
324
		}
	}
325
326
	decoder->private_->output_capacity = 0;
	decoder->private_->output_channels = 0;
327

Josh Coalson's avatar
Josh Coalson committed
328
	set_defaults_(decoder);
329

330
	decoder->protected_->state = FLAC__STREAM_DECODER_UNINITIALIZED;
331
332
}

333
FLAC_API FLAC__bool FLAC__stream_decoder_set_read_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderReadCallback value)
334
{
Josh Coalson's avatar
Josh Coalson committed
335
336
337
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
338
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
339
		return false;
340
	decoder->private_->read_callback = value;
341
342
343
	return true;
}

344
FLAC_API FLAC__bool FLAC__stream_decoder_set_write_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderWriteCallback value)
345
{
Josh Coalson's avatar
Josh Coalson committed
346
347
348
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
349
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
350
		return false;
351
	decoder->private_->write_callback = value;
352
353
354
	return true;
}

355
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderMetadataCallback value)
356
{
Josh Coalson's avatar
Josh Coalson committed
357
358
359
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
360
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
361
		return false;
362
	decoder->private_->metadata_callback = value;
363
364
365
	return true;
}

366
FLAC_API FLAC__bool FLAC__stream_decoder_set_error_callback(FLAC__StreamDecoder *decoder, FLAC__StreamDecoderErrorCallback value)
367
{
Josh Coalson's avatar
Josh Coalson committed
368
369
370
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
371
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
372
		return false;
373
	decoder->private_->error_callback = value;
374
375
376
	return true;
}

377
FLAC_API FLAC__bool FLAC__stream_decoder_set_client_data(FLAC__StreamDecoder *decoder, void *value)
378
{
Josh Coalson's avatar
Josh Coalson committed
379
380
381
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
382
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
383
		return false;
384
	decoder->private_->client_data = value;
385
386
387
	return true;
}

388
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
389
{
Josh Coalson's avatar
Josh Coalson committed
390
391
392
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
393
	FLAC__ASSERT((unsigned)type < (1u << FLAC__STREAM_METADATA_TYPE_LEN));
394
	/* double protection */
Josh Coalson's avatar
Josh Coalson committed
395
	if((unsigned)type >= (1u << FLAC__STREAM_METADATA_TYPE_LEN))
396
		return false;
397
398
399
400
401
402
403
404
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->metadata_filter[type] = true;
	if(type == FLAC__METADATA_TYPE_APPLICATION)
		decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

405
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
406
{
Josh Coalson's avatar
Josh Coalson committed
407
408
409
410
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT(0 != id);
411
412
413
414
415
416
417
418
419
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;

	if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
		return true;

	FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);

	if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
Josh Coalson's avatar
Josh Coalson committed
420
		if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
421
422
423
424
425
426
427
428
429
430
			return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		decoder->private_->metadata_filter_ids_capacity *= 2;
	}

	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));
	decoder->private_->metadata_filter_ids_count++;

	return true;
}

431
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_respond_all(FLAC__StreamDecoder *decoder)
432
{
433
	unsigned i;
Josh Coalson's avatar
Josh Coalson committed
434
435
436
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
437
438
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
439
440
	for(i = 0; i < sizeof(decoder->private_->metadata_filter) / sizeof(decoder->private_->metadata_filter[0]); i++)
		decoder->private_->metadata_filter[i] = true;
441
442
443
444
	decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

445
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore(FLAC__StreamDecoder *decoder, FLAC__MetadataType type)
446
{
Josh Coalson's avatar
Josh Coalson committed
447
448
449
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
450
	FLAC__ASSERT((unsigned)type < (1u << FLAC__STREAM_METADATA_TYPE_LEN));
451
	/* double protection */
Josh Coalson's avatar
Josh Coalson committed
452
	if((unsigned)type >= (1u << FLAC__STREAM_METADATA_TYPE_LEN))
453
		return false;
454
455
456
457
458
459
460
461
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	decoder->private_->metadata_filter[type] = false;
	if(type == FLAC__METADATA_TYPE_APPLICATION)
		decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

462
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_application(FLAC__StreamDecoder *decoder, const FLAC__byte id[4])
463
{
Josh Coalson's avatar
Josh Coalson committed
464
465
466
467
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
	FLAC__ASSERT(0 != id);
468
469
470
471
472
473
474
475
476
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;

	if(!decoder->private_->metadata_filter[FLAC__METADATA_TYPE_APPLICATION])
		return true;

	FLAC__ASSERT(0 != decoder->private_->metadata_filter_ids);

	if(decoder->private_->metadata_filter_ids_count == decoder->private_->metadata_filter_ids_capacity) {
Josh Coalson's avatar
Josh Coalson committed
477
		if(0 == (decoder->private_->metadata_filter_ids = (FLAC__byte*)realloc(decoder->private_->metadata_filter_ids, decoder->private_->metadata_filter_ids_capacity * 2)))
478
479
480
481
482
483
484
485
486
487
			return decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
		decoder->private_->metadata_filter_ids_capacity *= 2;
	}

	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));
	decoder->private_->metadata_filter_ids_count++;

	return true;
}

488
FLAC_API FLAC__bool FLAC__stream_decoder_set_metadata_ignore_all(FLAC__StreamDecoder *decoder)
489
{
Josh Coalson's avatar
Josh Coalson committed
490
491
492
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
493
494
495
496
497
498
499
	if(decoder->protected_->state != FLAC__STREAM_DECODER_UNINITIALIZED)
		return false;
	memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
	decoder->private_->metadata_filter_ids_count = 0;
	return true;
}

500
FLAC_API FLAC__StreamDecoderState FLAC__stream_decoder_get_state(const FLAC__StreamDecoder *decoder)
501
{
Josh Coalson's avatar
Josh Coalson committed
502
503
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
504
	return decoder->protected_->state;
505
506
}

507
FLAC_API unsigned FLAC__stream_decoder_get_channels(const FLAC__StreamDecoder *decoder)
508
{
Josh Coalson's avatar
Josh Coalson committed
509
510
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
511
	return decoder->protected_->channels;
512
513
}

514
FLAC_API FLAC__ChannelAssignment FLAC__stream_decoder_get_channel_assignment(const FLAC__StreamDecoder *decoder)
515
{
Josh Coalson's avatar
Josh Coalson committed
516
517
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
518
	return decoder->protected_->channel_assignment;
519
520
}

521
FLAC_API unsigned FLAC__stream_decoder_get_bits_per_sample(const FLAC__StreamDecoder *decoder)
522
{
Josh Coalson's avatar
Josh Coalson committed
523
524
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
525
	return decoder->protected_->bits_per_sample;
526
527
}

528
FLAC_API unsigned FLAC__stream_decoder_get_sample_rate(const FLAC__StreamDecoder *decoder)
529
{
Josh Coalson's avatar
Josh Coalson committed
530
531
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
532
	return decoder->protected_->sample_rate;
533
534
}

535
FLAC_API unsigned FLAC__stream_decoder_get_blocksize(const FLAC__StreamDecoder *decoder)
536
{
Josh Coalson's avatar
Josh Coalson committed
537
538
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->protected_);
539
	return decoder->protected_->blocksize;
Josh Coalson's avatar
Josh Coalson committed
540
541
}

542
FLAC_API FLAC__bool FLAC__stream_decoder_flush(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
543
{
Josh Coalson's avatar
Josh Coalson committed
544
545
546
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
547

548
	if(!FLAC__bitbuffer_clear(decoder->private_->input)) {
549
		decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
Josh Coalson's avatar
Josh Coalson committed
550
551
		return false;
	}
552
	decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC;
Josh Coalson's avatar
Josh Coalson committed
553
554
555
556

	return true;
}

557
FLAC_API FLAC__bool FLAC__stream_decoder_reset(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
558
{
Josh Coalson's avatar
Josh Coalson committed
559
560
561
	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
562
563

	if(!FLAC__stream_decoder_flush(decoder)) {
564
		decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
Josh Coalson's avatar
Josh Coalson committed
565
566
		return false;
	}
567
	decoder->protected_->state = FLAC__STREAM_DECODER_SEARCH_FOR_METADATA;
Josh Coalson's avatar
Josh Coalson committed
568

569
	decoder->private_->samples_decoded = 0;
Josh Coalson's avatar
Josh Coalson committed
570

Josh Coalson's avatar
Josh Coalson committed
571
572
573
	return true;
}

574
FLAC_API FLAC__bool FLAC__stream_decoder_process_single(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
575
{
Josh Coalson's avatar
Josh Coalson committed
576
	FLAC__bool got_a_frame;
Josh Coalson's avatar
Josh Coalson committed
577
	FLAC__ASSERT(0 != decoder);
Josh Coalson's avatar
Josh Coalson committed
578
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
579
580

	while(1) {
581
		switch(decoder->protected_->state) {
Josh Coalson's avatar
Josh Coalson committed
582
			case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
Josh Coalson's avatar
Josh Coalson committed
583
				if(!find_metadata_(decoder))
Josh Coalson's avatar
Josh Coalson committed
584
585
586
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_METADATA:
Josh Coalson's avatar
Josh Coalson committed
587
				if(!read_metadata_(decoder))
Josh Coalson's avatar
Josh Coalson committed
588
					return false; /* above function sets the status for us */
Josh Coalson's avatar
Josh Coalson committed
589
590
				else
					return true;
Josh Coalson's avatar
Josh Coalson committed
591
			case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
Josh Coalson's avatar
Josh Coalson committed
592
				if(!frame_sync_(decoder))
Josh Coalson's avatar
Josh Coalson committed
593
594
595
					return true; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_FRAME:
Josh Coalson's avatar
Josh Coalson committed
596
				if(!read_frame_(decoder, &got_a_frame))
Josh Coalson's avatar
Josh Coalson committed
597
					return false; /* above function sets the status for us */
Josh Coalson's avatar
Josh Coalson committed
598
599
				if(got_a_frame)
					return true; /* above function sets the status for us */
Josh Coalson's avatar
Josh Coalson committed
600
601
				break;
			case FLAC__STREAM_DECODER_END_OF_STREAM:
602
			case FLAC__STREAM_DECODER_ABORTED:
Josh Coalson's avatar
Josh Coalson committed
603
604
				return true;
			default:
605
				FLAC__ASSERT(0);
Josh Coalson's avatar
Josh Coalson committed
606
				return false;
Josh Coalson's avatar
Josh Coalson committed
607
608
609
610
		}
	}
}

611
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_metadata(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
612
{
Josh Coalson's avatar
Josh Coalson committed
613
	FLAC__ASSERT(0 != decoder);
Josh Coalson's avatar
Josh Coalson committed
614
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
615
616

	while(1) {
617
		switch(decoder->protected_->state) {
Josh Coalson's avatar
Josh Coalson committed
618
			case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
Josh Coalson's avatar
Josh Coalson committed
619
				if(!find_metadata_(decoder))
Josh Coalson's avatar
Josh Coalson committed
620
621
622
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_METADATA:
Josh Coalson's avatar
Josh Coalson committed
623
				if(!read_metadata_(decoder))
Josh Coalson's avatar
Josh Coalson committed
624
625
626
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
627
			case FLAC__STREAM_DECODER_READ_FRAME:
Josh Coalson's avatar
Josh Coalson committed
628
			case FLAC__STREAM_DECODER_END_OF_STREAM:
629
			case FLAC__STREAM_DECODER_ABORTED:
Josh Coalson's avatar
Josh Coalson committed
630
631
				return true;
			default:
632
				FLAC__ASSERT(0);
Josh Coalson's avatar
Josh Coalson committed
633
				return false;
Josh Coalson's avatar
Josh Coalson committed
634
635
636
637
		}
	}
}

638
FLAC_API FLAC__bool FLAC__stream_decoder_process_until_end_of_stream(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
639
{
Josh Coalson's avatar
Josh Coalson committed
640
	FLAC__bool dummy;
Josh Coalson's avatar
Josh Coalson committed
641
	FLAC__ASSERT(0 != decoder);
Josh Coalson's avatar
Josh Coalson committed
642
	FLAC__ASSERT(0 != decoder->protected_);
Josh Coalson's avatar
Josh Coalson committed
643
644

	while(1) {
645
		switch(decoder->protected_->state) {
Josh Coalson's avatar
Josh Coalson committed
646
647
648
			case FLAC__STREAM_DECODER_SEARCH_FOR_METADATA:
				if(!find_metadata_(decoder))
					return false; /* above function sets the status for us */
Josh Coalson's avatar
Josh Coalson committed
649
				break;
Josh Coalson's avatar
Josh Coalson committed
650
651
			case FLAC__STREAM_DECODER_READ_METADATA:
				if(!read_metadata_(decoder))
Josh Coalson's avatar
Josh Coalson committed
652
653
654
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_SEARCH_FOR_FRAME_SYNC:
Josh Coalson's avatar
Josh Coalson committed
655
				if(!frame_sync_(decoder))
Josh Coalson's avatar
Josh Coalson committed
656
657
658
					return true; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_READ_FRAME:
Josh Coalson's avatar
Josh Coalson committed
659
				if(!read_frame_(decoder, &dummy))
Josh Coalson's avatar
Josh Coalson committed
660
661
662
					return false; /* above function sets the status for us */
				break;
			case FLAC__STREAM_DECODER_END_OF_STREAM:
663
			case FLAC__STREAM_DECODER_ABORTED:
Josh Coalson's avatar
Josh Coalson committed
664
665
				return true;
			default:
666
				FLAC__ASSERT(0);
Josh Coalson's avatar
Josh Coalson committed
667
				return false;
Josh Coalson's avatar
Josh Coalson committed
668
669
670
671
		}
	}
}

672
673
674
675
676
677
/***********************************************************************
 *
 * Protected class methods
 *
 ***********************************************************************/

678
unsigned FLAC__stream_decoder_get_input_bytes_unconsumed(const FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
679
{
Josh Coalson's avatar
Josh Coalson committed
680
	FLAC__ASSERT(0 != decoder);
681
	return FLAC__bitbuffer_get_input_bytes_unconsumed(decoder->private_->input);
Josh Coalson's avatar
Josh Coalson committed
682
683
}

684
685
686
687
688
689
/***********************************************************************
 *
 * Private class methods
 *
 ***********************************************************************/

Josh Coalson's avatar
Josh Coalson committed
690
void set_defaults_(FLAC__StreamDecoder *decoder)
691
692
693
694
695
696
697
698
699
700
701
702
{
	decoder->private_->read_callback = 0;
	decoder->private_->write_callback = 0;
	decoder->private_->metadata_callback = 0;
	decoder->private_->error_callback = 0;
	decoder->private_->client_data = 0;

	memset(decoder->private_->metadata_filter, 0, sizeof(decoder->private_->metadata_filter));
	decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO] = true;
	decoder->private_->metadata_filter_ids_count = 0;
}

Josh Coalson's avatar
Josh Coalson committed
703
FLAC__bool allocate_output_(FLAC__StreamDecoder *decoder, unsigned size, unsigned channels)
Josh Coalson's avatar
Josh Coalson committed
704
705
{
	unsigned i;
Josh Coalson's avatar
Josh Coalson committed
706
	FLAC__int32 *tmp;
Josh Coalson's avatar
Josh Coalson committed
707

708
	if(size <= decoder->private_->output_capacity && channels <= decoder->private_->output_channels)
Josh Coalson's avatar
Josh Coalson committed
709
710
		return true;

Josh Coalson's avatar
Josh Coalson committed
711
	/* simply using realloc() is not practical because the number of channels may change mid-stream */
712

Josh Coalson's avatar
Josh Coalson committed
713
	for(i = 0; i < FLAC__MAX_CHANNELS; i++) {
Josh Coalson's avatar
Josh Coalson committed
714
		if(0 != decoder->private_->output[i]) {
715
			free(decoder->private_->output[i]-4);
716
			decoder->private_->output[i] = 0;
Josh Coalson's avatar
Josh Coalson committed
717
		}
Josh Coalson's avatar
Josh Coalson committed
718
		if(0 != decoder->private_->residual[i]) {
719
720
			free(decoder->private_->residual[i]);
			decoder->private_->residual[i] = 0;
721
		}
Josh Coalson's avatar
Josh Coalson committed
722
723
	}

724
	for(i = 0; i < channels; i++) {
725
726
727
728
729
730
		/* WATCHOUT:
		 * FLAC__lpc_restore_signal_asm_ia32_mmx() requires that the
		 * output arrays have a buffer of up to 3 zeroes in front
		 * (at negative indices) for alignment purposes; we use 4
		 * to keep the data well-aligned.
		 */
731
		tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*(size+4));
Josh Coalson's avatar
Josh Coalson committed
732
		if(tmp == 0) {
733
			decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
Josh Coalson's avatar
Josh Coalson committed
734
735
			return false;
		}
736
		memset(tmp, 0, sizeof(FLAC__int32)*4);
737
		decoder->private_->output[i] = tmp + 4;
738

Josh Coalson's avatar
Josh Coalson committed
739
		tmp = (FLAC__int32*)malloc(sizeof(FLAC__int32)*size);
740
		if(tmp == 0) {
741
			decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
742
743
			return false;
		}
744
		decoder->private_->residual[i] = tmp;
Josh Coalson's avatar
Josh Coalson committed
745
746
	}

747
748
	decoder->private_->output_capacity = size;
	decoder->private_->output_channels = channels;
Josh Coalson's avatar
Josh Coalson committed
749
750
751
752

	return true;
}

Josh Coalson's avatar
Josh Coalson committed
753
FLAC__bool has_id_filtered_(FLAC__StreamDecoder *decoder, FLAC__byte *id)
754
755
756
757
758
759
760
761
762
763
764
765
766
{
	unsigned i;

	FLAC__ASSERT(0 != decoder);
	FLAC__ASSERT(0 != decoder->private_);

	for(i = 0; i < decoder->private_->metadata_filter_ids_count; i++)
		if(0 == memcmp(decoder->private_->metadata_filter_ids + i * (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8), id, (FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8)))
			return true;

	return false;
}

Josh Coalson's avatar
Josh Coalson committed
767
FLAC__bool find_metadata_(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
768
{
Josh Coalson's avatar
Josh Coalson committed
769
	FLAC__uint32 x;
Josh Coalson's avatar
Josh Coalson committed
770
	unsigned i, id;
Josh Coalson's avatar
Josh Coalson committed
771
	FLAC__bool first = true;
Josh Coalson's avatar
Josh Coalson committed
772

773
	FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
Josh Coalson's avatar
Josh Coalson committed
774
775

	for(i = id = 0; i < 4; ) {
776
777
778
		if(decoder->private_->cached) {
			x = (FLAC__uint32)decoder->private_->lookahead;
			decoder->private_->cached = false;
779
780
		}
		else {
781
			if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
782
783
				return false; /* the read_callback_ sets the state for us */
		}
Josh Coalson's avatar
Josh Coalson committed
784
		if(x == FLAC__STREAM_SYNC_STRING[i]) {
785
			first = true;
Josh Coalson's avatar
Josh Coalson committed
786
787
788
789
790
791
792
793
			i++;
			id = 0;
			continue;
		}
		if(x == ID3V2_TAG_[id]) {
			id++;
			i = 0;
			if(id == 3) {
Josh Coalson's avatar
Josh Coalson committed
794
				if(!skip_id3v2_tag_(decoder))
Josh Coalson's avatar
Josh Coalson committed
795
796
797
798
799
					return false; /* the read_callback_ sets the state for us */
			}
			continue;
		}
		if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
800
			decoder->private_->header_warmup[0] = (FLAC__byte)x;
801
			if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, 8, read_callback_, decoder))
Josh Coalson's avatar
Josh Coalson committed
802
				return false; /* the read_callback_ sets the state for us */
803
804
805
806

			/* 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 */
			/* else we have to check if the second byte is the end of a sync code */
			if(x == 0xff) { /* MAGIC NUMBER for the first 8 frame sync bits */
807
808
				decoder->private_->lookahead = (FLAC__byte)x;
				decoder->private_->cached = true;
809
810
			}
			else if(x >> 2 == 0x3e) { /* MAGIC NUMBER for the last 6 sync bits */
811
812
				decoder->private_->header_warmup[1] = (FLAC__byte)x;
				decoder->protected_->state = FLAC__STREAM_DECODER_READ_FRAME;
Josh Coalson's avatar
Josh Coalson committed
813
814
815
816
817
				return true;
			}
		}
		i = 0;
		if(first) {
818
			decoder->private_->error_callback(decoder, FLAC__STREAM_DECODER_ERROR_STATUS_LOST_SYNC, decoder->private_->client_data);
819
			first = false;
Josh Coalson's avatar
Josh Coalson committed
820
821
822
		}
	}

823
	decoder->protected_->state = FLAC__STREAM_DECODER_READ_METADATA;
Josh Coalson's avatar
Josh Coalson committed
824
825
826
	return true;
}

Josh Coalson's avatar
Josh Coalson committed
827
FLAC__bool read_metadata_(FLAC__StreamDecoder *decoder)
Josh Coalson's avatar
Josh Coalson committed
828
{
829
830
	FLAC__bool is_last;
	FLAC__uint32 i, x, type, length;
Josh Coalson's avatar
Josh Coalson committed
831

832
	FLAC__ASSERT(FLAC__bitbuffer_is_consumed_byte_aligned(decoder->private_->input));
Josh Coalson's avatar
Josh Coalson committed
833

834
	if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &x, FLAC__STREAM_METADATA_IS_LAST_LEN, read_callback_, decoder))
Josh Coalson's avatar
Josh Coalson committed
835
		return false; /* the read_callback_ sets the state for us */
836
837
	is_last = x? true : false;

838
	if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &type, FLAC__STREAM_METADATA_TYPE_LEN, read_callback_, decoder))
Josh Coalson's avatar
Josh Coalson committed
839
		return false; /* the read_callback_ sets the state for us */
840

841
	if(!FLAC__bitbuffer_read_raw_uint32(decoder->private_->input, &length, FLAC__STREAM_METADATA_LENGTH_LEN, read_callback_, decoder))
Josh Coalson's avatar
Josh Coalson committed
842
		return false; /* the read_callback_ sets the state for us */
Josh Coalson's avatar
Josh Coalson committed
843

844
845
846
	if(type == FLAC__METADATA_TYPE_STREAMINFO) {
		if(!read_metadata_streaminfo_(decoder, is_last, length))
			return false;
847

848
		decoder->private_->has_stream_info = true;
849
850
		if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_STREAMINFO])
			decoder->private_->metadata_callback(decoder, &decoder->private_->stream_info, decoder->private_->client_data);
851
852
	}
	else if(type == FLAC__METADATA_TYPE_SEEKTABLE) {
853
		if(!read_metadata_seektable_(decoder, is_last, length))
854
			return false;
855

856
		decoder->private_->has_seek_table = true;
857
858
		if(decoder->private_->metadata_filter[FLAC__METADATA_TYPE_SEEKTABLE])
			decoder->private_->metadata_callback(decoder, &decoder->private_->seek_table, decoder->private_->client_data);
Josh Coalson's avatar
Josh Coalson committed
859
860
	}
	else {
861
862
		FLAC__bool skip_it = !decoder->private_->metadata_filter[type];
		unsigned real_length = length;
863
		FLAC__StreamMetadata block;
864

865
		block.is_last = is_last;
Josh Coalson's avatar
Josh Coalson committed
866
		block.type = (FLAC__MetadataType)type;
867
868
		block.length = length;

869
		if(type == FLAC__METADATA_TYPE_APPLICATION) {
870
			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))
871
872
873
874
				return false; /* the read_callback_ sets the state for us */

			real_length -= FLAC__STREAM_METADATA_APPLICATION_ID_LEN/8;

Josh Coalson's avatar
Josh Coalson committed
875
			if(decoder->private_->metadata_filter_ids_count > 0 && has_id_filtered_(decoder, block.data.application.id))
876
877
878
879
				skip_it = !skip_it;
		}

		if(skip_it) {
880
			if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
Josh Coalson's avatar
Josh Coalson committed
881
882
				return false; /* the read_callback_ sets the state for us */
		}
883
884
885
886
		else {
			switch(type) {
				case FLAC__METADATA_TYPE_PADDING:
					/* skip the padding bytes */
887
					if(!FLAC__bitbuffer_read_byte_block_aligned_no_crc(decoder->private_->input, 0, real_length, read_callback_, decoder))
888
889
890
891
						return false; /* the read_callback_ sets the state for us */
					break;
				case FLAC__METADATA_TYPE_APPLICATION:
					/* remember, we read the ID already */
892
					if(real_length > 0) {
Josh Coalson's avatar
Josh Coalson committed
893
						if(0 == (block.data.application.data = (FLAC__byte*)malloc(real_length))) {
894
895
896
							decoder->protected_->state = FLAC__STREAM_DECODER_MEMORY_ALLOCATION_ERROR;
							return false;
						}
897