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 /* VERSION should come from configure */
32 const char *FLAC__VERSION_STRING = VERSION;
34 #if defined _MSC_VER || defined __MINW32__
35 /* yet one more hack because of MSVC6: */
36 const char *FLAC__VENDOR_STRING = "reference libFLAC 1.0.4 20020924";
38 const char *FLAC__VENDOR_STRING = "reference libFLAC " VERSION " 20020924";
41 const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };
42 const unsigned FLAC__STREAM_SYNC = 0x664C6143;
43 const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */;
45 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */
46 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */
47 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */
48 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */
49 const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */
50 const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */
51 const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */
52 const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */
53 const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */
55 const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */
57 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */
58 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */
59 const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */
61 const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = 0xffffffffffffffff;
63 const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */
64 const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */
66 const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */
67 const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */
68 const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */
70 const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe;
71 const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */
72 const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */
73 const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */
74 const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */
75 const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */
76 const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */
77 const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */
78 const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */
80 const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */
82 const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */
83 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */
84 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */
85 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */
87 const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
89 const char * const FLAC__EntropyCodingMethodTypeString[] = {
93 const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */
94 const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */
96 const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */
97 const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */
98 const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */
100 const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;
101 const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;
102 const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;
103 const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40;
105 const char * const FLAC__SubframeTypeString[] = {
112 const char * const FLAC__ChannelAssignmentString[] = {
119 const char * const FLAC__FrameNumberTypeString[] = {
120 "FRAME_NUMBER_TYPE_FRAME_NUMBER",
121 "FRAME_NUMBER_TYPE_SAMPLE_NUMBER"
124 const char * const FLAC__MetadataTypeString[] = {
132 FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate)
136 sample_rate > FLAC__MAX_SAMPLE_RATE ||
138 sample_rate >= (1u << 16) &&
139 !(sample_rate % 1000 == 0 || sample_rate % 10 == 0)
148 FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table)
151 FLAC__uint64 prev_sample_number = 0;
152 FLAC__bool got_prev = false;
154 FLAC__ASSERT(0 != seek_table);
156 for(i = 0; i < seek_table->num_points; i++) {
159 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
160 seek_table->points[i].sample_number <= prev_sample_number
164 prev_sample_number = seek_table->points[i].sample_number;
171 /* used as the sort predicate for qsort() */
172 static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r)
174 /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */
175 if(l->sample_number == r->sample_number)
177 else if(l->sample_number < r->sample_number)
183 unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table)
188 FLAC__ASSERT(0 != seek_table);
190 /* sort the seekpoints */
191 qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_);
193 /* uniquify the seekpoints */
195 for(i = j = 0; i < seek_table->num_points; i++) {
196 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
198 if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
203 seek_table->points[j++] = seek_table->points[i];
206 for(i = j; i < seek_table->num_points; i++) {
207 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
208 seek_table->points[i].stream_offset = 0;
209 seek_table->points[i].frame_samples = 0;
215 unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order)
218 FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(
219 FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize),
225 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize)
227 unsigned max_rice_partition_order = 0;
228 while(!(blocksize & 1)) {
229 max_rice_partition_order++;
232 return min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order);
235 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order)
237 unsigned max_rice_partition_order = limit;
239 while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order)
240 max_rice_partition_order--;
242 FLAC__ASSERT(blocksize >> max_rice_partition_order > predictor_order);
244 return max_rice_partition_order;
247 void FLAC__format_entropy_coding_method_partitioned_rice_contents_init(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
249 FLAC__ASSERT(0 != object);
251 object->parameters = 0;
252 object->raw_bits = 0;
253 object->capacity_by_order = 0;
256 void FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
258 FLAC__ASSERT(0 != object);
260 if(0 != object->parameters)
261 free(object->parameters);
262 if(0 != object->raw_bits)
263 free(object->raw_bits);
264 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(object);
267 FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(FLAC__EntropyCodingMethod_PartitionedRiceContents *object, unsigned max_partition_order)
269 FLAC__ASSERT(0 != object);
271 FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits));
273 if(object->capacity_by_order < max_partition_order) {
274 if(0 == (object->parameters = realloc(object->parameters, sizeof(unsigned)*(1 << max_partition_order))))
276 if(0 == (object->raw_bits = realloc(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order))))
278 object->capacity_by_order = max_partition_order;