| /* 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)) |
| |
| /* VERSION should come from configure */ |
| const char *FLAC__VERSION_STRING = VERSION; |
| |
| #if defined _MSC_VER || defined __MINW32__ |
| /* yet one more hack because of MSVC6: */ |
| const char *FLAC__VENDOR_STRING = "reference libFLAC 1.0.4 20020924"; |
| #else |
| const char *FLAC__VENDOR_STRING = "reference libFLAC " VERSION " 20020924"; |
| #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; |
| } |