1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002 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"
29 #define min(a,b) ((a)<(b)?(a):(b))
31 const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };
32 const unsigned FLAC__STREAM_SYNC = 0x664C6143;
33 const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */;
35 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */
36 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */
37 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */
38 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */
39 const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */
40 const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */
41 const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */
42 const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */
43 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */
45 const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */
47 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */
48 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */
49 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */
51 const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = 0xffffffffffffffff;
53 const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */
54 const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */
56 const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */
57 const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */
58 const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */
60 const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe;
61 const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */
62 const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */
63 const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */
64 const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */
65 const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */
66 const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */
67 const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */
68 const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */
70 const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */
72 const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */
73 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */
74 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */
75 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */
77 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
79 const char * const FLAC__EntropyCodingMethodTypeString[] = {
83 const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */
84 const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */
86 const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */
87 const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */
88 const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */
90 const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;
91 const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;
92 const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;
93 const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40;
95 const char * const FLAC__SubframeTypeString[] = {
102 const char * const FLAC__ChannelAssignmentString[] = {
109 const char * const FLAC__FrameNumberTypeString[] = {
110 "FRAME_NUMBER_TYPE_FRAME_NUMBER",
111 "FRAME_NUMBER_TYPE_SAMPLE_NUMBER"
114 const char * const FLAC__MetadataTypeString[] = {
122 FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate)
126 sample_rate > FLAC__MAX_SAMPLE_RATE ||
128 sample_rate >= (1u << 16) &&
129 !(sample_rate % 1000 == 0 || sample_rate % 10 == 0)
138 FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table)
141 FLAC__uint64 prev_sample_number = 0;
142 FLAC__bool got_prev = false;
144 FLAC__ASSERT(0 != seek_table);
146 for(i = 0; i < seek_table->num_points; i++) {
149 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
150 seek_table->points[i].sample_number <= prev_sample_number
154 prev_sample_number = seek_table->points[i].sample_number;
161 /* used as the sort predicate for qsort() */
162 static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r)
164 /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */
165 if(l->sample_number == r->sample_number)
167 else if(l->sample_number < r->sample_number)
173 unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table)
178 FLAC__ASSERT(0 != seek_table);
180 /* sort the seekpoints */
181 qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_);
183 /* uniquify the seekpoints */
185 for(i = j = 0; i < seek_table->num_points; i++) {
186 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
188 if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
193 seek_table->points[j++] = seek_table->points[i];
196 for(i = j; i < seek_table->num_points; i++) {
197 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
198 seek_table->points[i].stream_offset = 0;
199 seek_table->points[i].frame_samples = 0;
205 unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order)
208 FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(
209 FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize),
215 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize)
217 unsigned max_rice_partition_order = 0;
218 while(!(blocksize & 1)) {
219 max_rice_partition_order++;
222 return min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order);
225 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order)
227 unsigned max_rice_partition_order = limit;
229 while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order)
230 max_rice_partition_order--;
232 FLAC__ASSERT(blocksize >> max_rice_partition_order > predictor_order);
234 return max_rice_partition_order;
237 void FLAC__format_entropy_coding_method_partitioned_rice_init(FLAC__EntropyCodingMethod_PartitionedRice *object)
239 FLAC__ASSERT(0 != object);
242 object->parameters = 0;
243 object->raw_bits = 0;
244 object->capacity_by_order = 0;
247 void FLAC__format_entropy_coding_method_partitioned_rice_clear(FLAC__EntropyCodingMethod_PartitionedRice *object)
249 FLAC__ASSERT(0 != object);
251 if(0 != object->parameters)
252 free(object->parameters);
253 if(0 != object->raw_bits)
254 free(object->raw_bits);
255 FLAC__format_entropy_coding_method_partitioned_rice_init(object);
258 FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_ensure_size(FLAC__EntropyCodingMethod_PartitionedRice *object, unsigned max_partition_order)
260 FLAC__ASSERT(0 != object);
262 FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits));
264 if(object->capacity_by_order < max_partition_order) {
265 if(0 == (object->parameters = realloc(object->parameters, sizeof(unsigned)*(1 << max_partition_order))))
267 if(0 == (object->raw_bits = realloc(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order))))
269 object->capacity_by_order = max_partition_order;