1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003 Josh Coalson
4 * This library is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Library General Public
6 * License as published by the Free Software Foundation; either
7 * version 2 of the License, or (at your option) any later version.
9 * This library is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Library General Public License for more details.
14 * You should have received a copy of the GNU Library General Public
15 * License along with this library; if not, write to the
16 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17 * Boston, MA 02111-1307, USA.
21 #include <stdlib.h> /* for qsort() */
22 #include "FLAC/assert.h"
23 #include "FLAC/format.h"
24 #include "private/format.h"
33 #define min(a,b) ((a)<(b)?(a):(b))
35 /* VERSION should come from configure */
36 FLAC_API const char *FLAC__VERSION_STRING = VERSION;
38 #if defined _MSC_VER || defined __MINW32__
39 /* yet one more hack because of MSVC6: */
40 FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC 1.0.5_beta2 20030102";
42 FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC " VERSION " 20030102";
45 FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };
46 FLAC_API const unsigned FLAC__STREAM_SYNC = 0x664C6143;
47 FLAC_API const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */;
49 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */
50 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */
51 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */
52 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */
53 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */
54 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */
55 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */
56 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */
57 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */
59 FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */
61 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */
62 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */
63 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */
65 FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = 0xffffffffffffffff;
67 FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */
68 FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */
70 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN = 64; /* bits */
71 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN = 8; /* bits */
72 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN = 3*8; /* bits @@@@3*/
74 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN = 64; /* bits */
75 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN = 8; /* bits */
76 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN = 12*8; /* bits */
77 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN = 1; /* bit */
78 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN = 1; /* bit */
79 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN = 6+13*8; /* bits @@@@13*/
80 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN = 8; /* bits */
82 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN = 128*8; /* bits */
83 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN = 64; /* bits */
84 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN = 1; /* bit */
85 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN = 7+258*8; /* bits @@@@258 */
86 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN = 8; /* bits */
88 FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */
89 FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */
90 FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */
92 FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe;
93 FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */
94 FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */
95 FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */
96 FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */
97 FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */
98 FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */
99 FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */
100 FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */
102 FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */
104 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */
105 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */
106 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */
107 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */
109 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
111 FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[] = {
115 FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */
116 FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */
118 FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */
119 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */
120 FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */
122 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;
123 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;
124 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;
125 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40;
127 FLAC_API const char * const FLAC__SubframeTypeString[] = {
134 FLAC_API const char * const FLAC__ChannelAssignmentString[] = {
141 FLAC_API const char * const FLAC__FrameNumberTypeString[] = {
142 "FRAME_NUMBER_TYPE_FRAME_NUMBER",
143 "FRAME_NUMBER_TYPE_SAMPLE_NUMBER"
146 FLAC_API const char * const FLAC__MetadataTypeString[] = {
155 FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate)
159 sample_rate > FLAC__MAX_SAMPLE_RATE ||
161 sample_rate >= (1u << 16) &&
162 !(sample_rate % 1000 == 0 || sample_rate % 10 == 0)
171 FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table)
174 FLAC__uint64 prev_sample_number = 0;
175 FLAC__bool got_prev = false;
177 FLAC__ASSERT(0 != seek_table);
179 for(i = 0; i < seek_table->num_points; i++) {
182 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
183 seek_table->points[i].sample_number <= prev_sample_number
187 prev_sample_number = seek_table->points[i].sample_number;
194 /* used as the sort predicate for qsort() */
195 static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r)
197 /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */
198 if(l->sample_number == r->sample_number)
200 else if(l->sample_number < r->sample_number)
206 FLAC_API unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table)
211 FLAC__ASSERT(0 != seek_table);
213 /* sort the seekpoints */
214 qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_);
216 /* uniquify the seekpoints */
218 for(i = j = 0; i < seek_table->num_points; i++) {
219 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
221 if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
226 seek_table->points[j++] = seek_table->points[i];
229 for(i = j; i < seek_table->num_points; i++) {
230 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
231 seek_table->points[i].stream_offset = 0;
232 seek_table->points[i].frame_samples = 0;
238 FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation)
242 if(check_cd_da_subset) {
243 if(cue_sheet->lead_in < 2 * 44100) {
244 if(violation) *violation = "CD-DA cue sheet must have a lead-in length of at least 2 seconds";
247 if(cue_sheet->lead_in % 588 != 0) {
248 if(violation) *violation = "CD-DA cue sheet lead-in length must be evenly divisible by 588 samples";
253 if(cue_sheet->num_tracks == 0) {
254 if(violation) *violation = "cue sheet must have at least one track (the lead-out)";
258 if(check_cd_da_subset && cue_sheet->tracks[cue_sheet->num_tracks-1].number != 170) {
259 if(violation) *violation = "CD-DA cue sheet must have a lead-out track number 170 (0xAA)";
263 for(i = 0; i < cue_sheet->num_tracks; i++) {
264 if(cue_sheet->tracks[i].number == 0) {
265 if(violation) *violation = "cue sheet may not have a track number 0";
269 if(check_cd_da_subset) {
270 if(!((cue_sheet->tracks[i].number >= 1 && cue_sheet->tracks[i].number <= 99) || cue_sheet->tracks[i].number == 170)) {
271 if(violation) *violation = "CD-DA cue sheet track number must be 1-99 or 170";
276 if(check_cd_da_subset && cue_sheet->tracks[i].offset % 588 != 0) {
277 if(violation) *violation = "CD-DA cue sheet track offset must be evenly divisible by 588 samples";
281 if(i < cue_sheet->num_tracks - 1) {
282 if(cue_sheet->tracks[i].num_indices == 0) {
283 if(violation) *violation = "cue sheet track must have at least one index point";
287 if(cue_sheet->tracks[i].indices[0].number > 1) {
288 if(violation) *violation = "cue sheet track's first index number must be 0 or 1";
293 for(j = 0; j < cue_sheet->tracks[i].num_indices; j++) {
294 if(check_cd_da_subset && cue_sheet->tracks[i].indices[j].offset % 588 != 0) {
295 if(violation) *violation = "CD-DA cue sheet track index offset must be evenly divisible by 588 samples";
300 if(cue_sheet->tracks[i].indices[j].number != cue_sheet->tracks[i].indices[j-1].number + 1) {
301 if(violation) *violation = "cue sheet track index numbers must increase by 1";
312 * These routines are private to libFLAC
314 unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order)
317 FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(
318 FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize),
324 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize)
326 unsigned max_rice_partition_order = 0;
327 while(!(blocksize & 1)) {
328 max_rice_partition_order++;
331 return min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order);
334 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order)
336 unsigned max_rice_partition_order = limit;
338 while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order)
339 max_rice_partition_order--;
342 (max_rice_partition_order == 0 && blocksize >= predictor_order) ||
343 (max_rice_partition_order > 0 && blocksize >> max_rice_partition_order > predictor_order)
346 return max_rice_partition_order;
349 void FLAC__format_entropy_coding_method_partitioned_rice_contents_init(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
351 FLAC__ASSERT(0 != object);
353 object->parameters = 0;
354 object->raw_bits = 0;
355 object->capacity_by_order = 0;
358 void FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
360 FLAC__ASSERT(0 != object);
362 if(0 != object->parameters)
363 free(object->parameters);
364 if(0 != object->raw_bits)
365 free(object->raw_bits);
366 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(object);
369 FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(FLAC__EntropyCodingMethod_PartitionedRiceContents *object, unsigned max_partition_order)
371 FLAC__ASSERT(0 != object);
373 FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits));
375 if(object->capacity_by_order < max_partition_order) {
376 if(0 == (object->parameters = (unsigned*)realloc(object->parameters, sizeof(unsigned)*(1 << max_partition_order))))
378 if(0 == (object->raw_bits = (unsigned*)realloc(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order))))
380 object->capacity_by_order = max_partition_order;