mirror of
https://github.com/claunia/flac.git
synced 2025-12-16 18:54:26 +00:00
280 lines
9.6 KiB
C
280 lines
9.6 KiB
C
/* libFLAC - Free Lossless Audio Codec library
|
|
* Copyright (C) 2000,2001,2002 Josh Coalson
|
|
*
|
|
* 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 qsort() */
|
|
#include "FLAC/assert.h"
|
|
#include "FLAC/format.h"
|
|
#include "private/format.h"
|
|
|
|
#ifdef min
|
|
#undef min
|
|
#endif
|
|
#define min(a,b) ((a)<(b)?(a):(b))
|
|
|
|
#if defined _MSC_VER || defined __MINW32__
|
|
/* yet one more hack because of MSVC6: */
|
|
const FLAC__byte *FLAC__VENDOR_STRING = "reference libFLAC 1.0.4_beta 20020910";
|
|
#else
|
|
const FLAC__byte *FLAC__VENDOR_STRING = "reference libFLAC " FLAC__VERSION_STRING " 20020910";
|
|
#endif
|
|
|
|
const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' };
|
|
const unsigned FLAC__STREAM_SYNC = 0x664C6143;
|
|
const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */;
|
|
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */
|
|
|
|
const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */
|
|
|
|
const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */
|
|
|
|
const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = 0xffffffffffffffff;
|
|
|
|
const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */
|
|
|
|
const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */
|
|
const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */
|
|
|
|
const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe;
|
|
const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */
|
|
const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */
|
|
|
|
const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */
|
|
|
|
const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */
|
|
const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */
|
|
const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */
|
|
const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */
|
|
|
|
const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */
|
|
|
|
const char * const FLAC__EntropyCodingMethodTypeString[] = {
|
|
"PARTITIONED_RICE"
|
|
};
|
|
|
|
const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */
|
|
const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */
|
|
|
|
const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */
|
|
const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */
|
|
const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */
|
|
|
|
const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00;
|
|
const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02;
|
|
const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10;
|
|
const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40;
|
|
|
|
const char * const FLAC__SubframeTypeString[] = {
|
|
"CONSTANT",
|
|
"VERBATIM",
|
|
"FIXED",
|
|
"LPC"
|
|
};
|
|
|
|
const char * const FLAC__ChannelAssignmentString[] = {
|
|
"INDEPENDENT",
|
|
"LEFT_SIDE",
|
|
"RIGHT_SIDE",
|
|
"MID_SIDE"
|
|
};
|
|
|
|
const char * const FLAC__FrameNumberTypeString[] = {
|
|
"FRAME_NUMBER_TYPE_FRAME_NUMBER",
|
|
"FRAME_NUMBER_TYPE_SAMPLE_NUMBER"
|
|
};
|
|
|
|
const char * const FLAC__MetadataTypeString[] = {
|
|
"STREAMINFO",
|
|
"PADDING",
|
|
"APPLICATION",
|
|
"SEEKTABLE",
|
|
"VORBIS_COMMENT"
|
|
};
|
|
|
|
FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate)
|
|
{
|
|
if(
|
|
sample_rate == 0 ||
|
|
sample_rate > FLAC__MAX_SAMPLE_RATE ||
|
|
(
|
|
sample_rate >= (1u << 16) &&
|
|
!(sample_rate % 1000 == 0 || sample_rate % 10 == 0)
|
|
)
|
|
) {
|
|
return false;
|
|
}
|
|
else
|
|
return true;
|
|
}
|
|
|
|
FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table)
|
|
{
|
|
unsigned i;
|
|
FLAC__uint64 prev_sample_number = 0;
|
|
FLAC__bool got_prev = false;
|
|
|
|
FLAC__ASSERT(0 != seek_table);
|
|
|
|
for(i = 0; i < seek_table->num_points; i++) {
|
|
if(got_prev) {
|
|
if(
|
|
seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER &&
|
|
seek_table->points[i].sample_number <= prev_sample_number
|
|
)
|
|
return false;
|
|
}
|
|
prev_sample_number = seek_table->points[i].sample_number;
|
|
got_prev = true;
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
/* used as the sort predicate for qsort() */
|
|
static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r)
|
|
{
|
|
/* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */
|
|
if(l->sample_number == r->sample_number)
|
|
return 0;
|
|
else if(l->sample_number < r->sample_number)
|
|
return -1;
|
|
else
|
|
return 1;
|
|
}
|
|
|
|
unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table)
|
|
{
|
|
unsigned i, j;
|
|
FLAC__bool first;
|
|
|
|
FLAC__ASSERT(0 != seek_table);
|
|
|
|
/* sort the seekpoints */
|
|
qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_);
|
|
|
|
/* uniquify the seekpoints */
|
|
first = true;
|
|
for(i = j = 0; i < seek_table->num_points; i++) {
|
|
if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) {
|
|
if(!first) {
|
|
if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number)
|
|
continue;
|
|
}
|
|
}
|
|
first = false;
|
|
seek_table->points[j++] = seek_table->points[i];
|
|
}
|
|
|
|
for(i = j; i < seek_table->num_points; i++) {
|
|
seek_table->points[i].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER;
|
|
seek_table->points[i].stream_offset = 0;
|
|
seek_table->points[i].frame_samples = 0;
|
|
}
|
|
|
|
return j;
|
|
}
|
|
|
|
unsigned FLAC__format_get_max_rice_partition_order(unsigned blocksize, unsigned predictor_order)
|
|
{
|
|
return
|
|
FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(
|
|
FLAC__format_get_max_rice_partition_order_from_blocksize(blocksize),
|
|
blocksize,
|
|
predictor_order
|
|
);
|
|
}
|
|
|
|
unsigned FLAC__format_get_max_rice_partition_order_from_blocksize(unsigned blocksize)
|
|
{
|
|
unsigned max_rice_partition_order = 0;
|
|
while(!(blocksize & 1)) {
|
|
max_rice_partition_order++;
|
|
blocksize >>= 1;
|
|
}
|
|
return min(FLAC__MAX_RICE_PARTITION_ORDER, max_rice_partition_order);
|
|
}
|
|
|
|
unsigned FLAC__format_get_max_rice_partition_order_from_blocksize_limited_max_and_predictor_order(unsigned limit, unsigned blocksize, unsigned predictor_order)
|
|
{
|
|
unsigned max_rice_partition_order = limit;
|
|
|
|
while(max_rice_partition_order > 0 && (blocksize >> max_rice_partition_order) <= predictor_order)
|
|
max_rice_partition_order--;
|
|
|
|
FLAC__ASSERT(blocksize >> max_rice_partition_order > predictor_order);
|
|
|
|
return max_rice_partition_order;
|
|
}
|
|
|
|
void FLAC__format_entropy_coding_method_partitioned_rice_contents_init(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
|
|
{
|
|
FLAC__ASSERT(0 != object);
|
|
|
|
object->parameters = 0;
|
|
object->raw_bits = 0;
|
|
object->capacity_by_order = 0;
|
|
}
|
|
|
|
void FLAC__format_entropy_coding_method_partitioned_rice_contents_clear(FLAC__EntropyCodingMethod_PartitionedRiceContents *object)
|
|
{
|
|
FLAC__ASSERT(0 != object);
|
|
|
|
if(0 != object->parameters)
|
|
free(object->parameters);
|
|
if(0 != object->raw_bits)
|
|
free(object->raw_bits);
|
|
FLAC__format_entropy_coding_method_partitioned_rice_contents_init(object);
|
|
}
|
|
|
|
FLAC__bool FLAC__format_entropy_coding_method_partitioned_rice_contents_ensure_size(FLAC__EntropyCodingMethod_PartitionedRiceContents *object, unsigned max_partition_order)
|
|
{
|
|
FLAC__ASSERT(0 != object);
|
|
|
|
FLAC__ASSERT(object->capacity_by_order > 0 || (0 == object->parameters && 0 == object->raw_bits));
|
|
|
|
if(object->capacity_by_order < max_partition_order) {
|
|
if(0 == (object->parameters = realloc(object->parameters, sizeof(unsigned)*(1 << max_partition_order))))
|
|
return false;
|
|
if(0 == (object->raw_bits = realloc(object->raw_bits, sizeof(unsigned)*(1 << max_partition_order))))
|
|
return false;
|
|
object->capacity_by_order = max_partition_order;
|
|
}
|
|
|
|
return true;
|
|
}
|