1 /* libFLAC - Free Lossless Audio Codec library
2 * Copyright (C) 2000,2001,2002,2003,2004,2005,2006 Josh Coalson
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
8 * - Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
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.
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.
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.
37 #include <stdlib.h> /* for qsort() */
38 #include "FLAC/assert.h"
39 #include "FLAC/format.h"
40 #include "private/format.h"
45 #define min(a,b) ((a)<(b)?(a):(b))
47 /* adjust for compilers that can't understand using LLU suffix for uint64_t literals */
49 #define FLAC__U64L(x) x
51 #define FLAC__U64L(x) x##LLU
54 /* VERSION should come from configure */
55 FLAC_API const char *FLAC__VERSION_STRING = VERSION;
57 #if defined _MSC_VER || defined __MINW32__
58 /* yet one more hack because of MSVC6: */
59 /*@@@@@@WAS:FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC 1.1.2 20050205";*/
60 FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC CVS 20060425";
62 FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC " VERSION " 20060425";
65 FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };
66 FLAC_API const unsigned FLAC__STREAM_SYNC = 0x664C6143;
67 FLAC_API const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */
69 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */
70 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */
71 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */
72 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */
73 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */
74 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */
75 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */
76 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */
77 FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */
79 FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */
81 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */
82 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */
83 FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */
85 FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = FLAC__U64L(0xffffffffffffffff);
87 FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */
88 FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */
90 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN = 64; /* bits */
91 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN = 8; /* bits */
92 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN = 3*8; /* bits */
94 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN = 64; /* bits */
95 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN = 8; /* bits */
96 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN = 12*8; /* bits */
97 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN = 1; /* bit */
98 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN = 1; /* bit */
99 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN = 6+13*8; /* bits */
100 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN = 8; /* bits */
102 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN = 128*8; /* bits */
103 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN = 64; /* bits */
104 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN = 1; /* bit */
105 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN = 7+258*8; /* bits */
106 FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN = 8; /* bits */
108 FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */
109 FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */
110 FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */
112 FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe;
113 FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */
114 FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */
115 FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */
116 FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */
117 FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */
118 FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */
119 FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */
120 FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */
122 FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */
124 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */
125 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */
126 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */
127 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */
129 FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
131 FLAC_API const char * const FLAC__EntropyCodingMethodTypeString[] = {
135 FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */
136 FLAC_API const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */
138 FLAC_API const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */
139 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */
140 FLAC_API const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */
142 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;
143 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;
144 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;
145 FLAC_API const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40;
147 FLAC_API const char * const FLAC__SubframeTypeString[] = {
154 FLAC_API const char * const FLAC__ChannelAssignmentString[] = {
161 FLAC_API const char * const FLAC__FrameNumberTypeString[] = {
162 "FRAME_NUMBER_TYPE_FRAME_NUMBER",
163 "FRAME_NUMBER_TYPE_SAMPLE_NUMBER"
166 FLAC_API const char * const FLAC__MetadataTypeString[] = {
175 FLAC_API FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate)
179 sample_rate > FLAC__MAX_SAMPLE_RATE ||
181 sample_rate >= (1u << 16) &&
182 !(sample_rate % 1000 == 0 || sample_rate % 10 == 0)
191 FLAC_API FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table)
194 FLAC__uint64 prev_sample_number = 0;
195 FLAC__bool got_prev = false;
197 FLAC__ASSERT(0 != seek_table);
199 for(i = 0; i < seek_table->num_points; i++) {
202 seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
203 seek_table->points[i].sample_number <= prev_sample_number
207 prev_sample_number = seek_table->points[i].sample_number;
214 /* used as the sort predicate for qsort() */
215 static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r)
217 /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */
218 if(l->sample_number == r->sample_number)
220 else if(l->sample_number < r->sample_number)
226 FLAC_API unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table)
231 FLAC__ASSERT(0 != seek_table);
233 /* sort the seekpoints */
234 qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_);
236 /* uniquify the seekpoints */
238 for(i = j = 0; i < seek_table->num_points; i++) {
239 if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
241 if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
246 seek_table->points[j++] = seek_table->points[i];
249 for(i = j; i < seek_table->num_points; i++) {
250 seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
251 seek_table->points[i].stream_offset = 0;
252 seek_table->points[i].frame_samples = 0;
259 * also disallows non-shortest-form encodings, c.f.
260 * http://www.unicode.org/versions/corrigendum1.html
261 * and a more clear explanation at the end of this section:
262 * http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8
264 static __inline unsigned utf8len_(const FLAC__byte *utf8)
266 FLAC__ASSERT(0 != utf8);
267 if ((utf8[0] & 0x80) == 0) {
270 else if ((utf8[0] & 0xE0) == 0xC0 && (utf8[1] & 0xC0) == 0x80) {
271 if ((utf8[0] & 0xFE) == 0xC0) /* overlong sequence check */
275 else if ((utf8[0] & 0xF0) == 0xE0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80) {
276 if (utf8[0] == 0xE0 && (utf8[1] & 0xE0) == 0x80) /* overlong sequence check */
278 /* illegal surrogates check (U+D800...U+DFFF and U+FFFE...U+FFFF) */
279 if (utf8[0] == 0xED && (utf8[1] & 0xE0) == 0xA0) /* D800-DFFF */
281 if (utf8[0] == 0xEF && utf8[1] == 0xBF && (utf8[2] & 0xFE) == 0xBE) /* FFFE-FFFF */
285 else if ((utf8[0] & 0xF8) == 0xF0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80) {
286 if (utf8[0] == 0xF0 && (utf8[1] & 0xF0) == 0x80) /* overlong sequence check */
290 else if ((utf8[0] & 0xFC) == 0xF8 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80) {
291 if (utf8[0] == 0xF8 && (utf8[1] & 0xF8) == 0x80) /* overlong sequence check */
295 else if ((utf8[0] & 0xFE) == 0xFC && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80 && (utf8[5] & 0xC0) == 0x80) {
296 if (utf8[0] == 0xFC && (utf8[1] & 0xFC) == 0x80) /* overlong sequence check */
305 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name)
308 for(c = *name; c; c = *(++name))
309 if(c < 0x20 || c == 0x3d || c > 0x7d)
314 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, unsigned length)
316 if(length == (unsigned)(-1)) {
318 unsigned n = utf8len_(value);
325 const FLAC__byte *end = value + length;
327 unsigned n = utf8len_(value);
338 FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, unsigned length)
340 const FLAC__byte *s, *end;
342 for(s = entry, end = s + length; s < end && *s != '='; s++) {
343 if(*s < 0x20 || *s > 0x7D)
352 unsigned n = utf8len_(s);
363 FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation)
367 if(check_cd_da_subset) {
368 if(cue_sheet->lead_in < 2 * 44100) {
369 if(violation) *violation = "CD-DA cue sheet must have a lead-in length of at least 2 seconds";
372 if(cue_sheet->lead_in % 588 != 0) {
373 if(violation) *violation = "CD-DA cue sheet lead-in length must be evenly divisible by 588 samples";
378 if(cue_sheet->num_tracks == 0) {
379 if(violation) *violation = "cue sheet must have at least one track (the lead-out)";
383 if(check_cd_da_subset && cue_sheet->tracks[cue_sheet->num_tracks-1].number != 170) {
384 if(violation) *violation = "CD-DA cue sheet must have a lead-out track number 170 (0xAA)";
388 for(i = 0; i < cue_sheet->num_tracks; i++) {
389 if(cue_sheet->tracks[i].number == 0) {
390 if(violation) *violation = "cue sheet may not have a track number 0";
394 if(check_cd_da_subset) {
395 if(!((cue_sheet->tracks[i].number >= 1 && cue_sheet->tracks[i].number <= 99) || cue_sheet->tracks[i].number == 170)) {
396 if(violation) *violation = "CD-DA cue sheet track number must be 1-99 or 170";
401 if(check_cd_da_subset && cue_sheet->tracks[i].offset % 588 != 0) {
403 if(i == cue_sheet->num_tracks-1) /* the lead-out track... */
404 *violation = "CD-DA cue sheet lead-out offset must be evenly divisible by 588 samples";
406 *violation = "CD-DA cue sheet track offset must be evenly divisible by 588 samples";
411 if(i < cue_sheet->num_tracks - 1) {
412 if(cue_sheet->tracks[i].num_indices == 0) {
413 if(violation) *violation = "cue sheet track must have at least one index point";
417 if(cue_sheet->tracks[i].indices[0].number > 1) {
418 if(violation) *violation = "cue sheet track's first index number must be 0 or 1";
423 for(j = 0; j < cue_sheet->tracks[i].num_indices; j++) {
424 if(check_cd_da_subset && cue_sheet->tracks[i].indices[j].offset % 588 != 0) {
425 if(violation) *violation = "CD-DA cue sheet track index offset must be evenly divisible by 588 samples";
430 if(cue_sheet->tracks[i].indices[j].number != cue_sheet->tracks[i].indices[j-1].number + 1) {
431 if(violation) *violation = "cue sheet track index numbers must increase by 1";
442 * These routines are private to libFLAC
444 unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order)
447 FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(
448 FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize),
454 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize)
456 unsigned max_rice_partition_order = 0;
457 while(!(blocksize & 1)) {
458 max_rice_partition_order++;
461 return min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order);
464 unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order)
466 unsigned max_rice_partition_order = limit;
468 while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order)
469 max_rice_partition_order--;
472 (max_rice_partition_order == 0 && blocksize >= predictor_order) ||
473 (max_rice_partition_order > 0 && blocksize >> max_rice_partition_order > predictor_order)
476 return max_rice_partition_order;
479 void FLAC__format_entropy_coding_method_partitioned_rice_contents_init(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
481 FLAC__ASSERT(0 != object);
483 object->parameters = 0;
484 object->raw_bits = 0;
485 object->capacity_by_order = 0;
488 void FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
490 FLAC__ASSERT(0 != object);
492 if(0 != object->parameters)
493 free(object->parameters);
494 if(0 != object->raw_bits)
495 free(object->raw_bits);
496 FLAC__format_entropy_coding_method_partitioned_rice_contents_init(object);
499 FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(FLAC__EntropyCodingMethod_PartitionedRiceContents *object, unsigned max_partition_order)
501 FLAC__ASSERT(0 != object);
503 FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits));
505 if(object->capacity_by_order < max_partition_order) {
506 if(0 == (object->parameters = (unsigned*)realloc(object->parameters, sizeof(unsigned)*(1 << max_partition_order))))
508 if(0 == (object->raw_bits = (unsigned*)realloc(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order))))
510 object->capacity_by_order = max_partition_order;