Josh Coalson | 26560dd | 2001-02-08 00:38:41 +0000 | [diff] [blame] | 1 | /* libFLAC - Free Lossless Audio Codec library |
Josh Coalson | 305ae2e | 2002-01-26 17:36:39 +0000 | [diff] [blame] | 2 | * Copyright (C) 2000,2001,2002 Josh Coalson |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 3 | * |
| 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. |
| 8 | * |
| 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. |
| 13 | * |
| 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. |
| 18 | */ |
| 19 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 20 | #include <stdio.h> |
Josh Coalson | 5a5de73 | 2002-08-01 06:37:11 +0000 | [diff] [blame^] | 21 | #include <stdlib.h> /* for qsort() */ |
Josh Coalson | 0d36cbd | 2002-07-15 05:24:56 +0000 | [diff] [blame] | 22 | #include "FLAC/assert.h" |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 23 | #include "FLAC/format.h" |
| 24 | |
Josh Coalson | 77e3f31 | 2001-06-23 03:03:24 +0000 | [diff] [blame] | 25 | const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' }; |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 26 | const unsigned FLAC__STREAM_SYNC = 0x664C6143; |
| 27 | const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */; |
| 28 | |
Josh Coalson | 2013572 | 2001-02-23 21:05:53 +0000 | [diff] [blame] | 29 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */ |
| 30 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */ |
| 31 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */ |
| 32 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */ |
| 33 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */ |
| 34 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */ |
| 35 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */ |
| 36 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */ |
| 37 | const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */ |
Josh Coalson | 2013572 | 2001-02-23 21:05:53 +0000 | [diff] [blame] | 38 | |
Josh Coalson | 52c44e9 | 2001-02-23 23:11:34 +0000 | [diff] [blame] | 39 | const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 40 | |
Josh Coalson | c5d08e0 | 2001-04-10 19:13:50 +0000 | [diff] [blame] | 41 | const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */ |
| 42 | const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */ |
Josh Coalson | 167658a | 2001-04-13 18:22:25 +0000 | [diff] [blame] | 43 | const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */ |
Josh Coalson | c5d08e0 | 2001-04-10 19:13:50 +0000 | [diff] [blame] | 44 | |
Josh Coalson | 77e3f31 | 2001-06-23 03:03:24 +0000 | [diff] [blame] | 45 | const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = 0xffffffffffffffff; |
Josh Coalson | 167658a | 2001-04-13 18:22:25 +0000 | [diff] [blame] | 46 | |
Josh Coalson | cc059bc | 2002-05-04 17:35:51 +0000 | [diff] [blame] | 47 | const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */ |
| 48 | const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */ |
| 49 | |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 50 | const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */ |
| 51 | const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */ |
| 52 | const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */ |
| 53 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame] | 54 | const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe; |
| 55 | const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */ |
| 56 | const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 2; /* bits */ |
| 57 | const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 58 | const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */ |
| 59 | const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */ |
| 60 | const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */ |
| 61 | const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */ |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame] | 62 | const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */ |
| 63 | |
| 64 | const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 65 | |
| 66 | const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */ |
| 67 | const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */ |
| 68 | const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */ |
Josh Coalson | 2051dd4 | 2001-04-12 22:22:34 +0000 | [diff] [blame] | 69 | const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */ |
| 70 | |
Josh Coalson | 6ff59c5 | 2001-04-13 18:43:53 +0000 | [diff] [blame] | 71 | const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1<<FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN)-1 */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 72 | |
Josh Coalson | 57ba6f4 | 2002-06-07 05:27:37 +0000 | [diff] [blame] | 73 | const char * const FLAC__EntropyCodingMethodTypeString[] = { |
Josh Coalson | 75d0a0b | 2001-01-24 00:42:16 +0000 | [diff] [blame] | 74 | "PARTITIONED_RICE" |
| 75 | }; |
| 76 | |
Josh Coalson | 6dcea51 | 2001-01-23 23:07:36 +0000 | [diff] [blame] | 77 | const unsigned FLAC__SUBFRAME_LPC_QLP_COEFF_PRECISION_LEN = 4; /* bits */ |
| 78 | const unsigned FLAC__SUBFRAME_LPC_QLP_SHIFT_LEN = 5; /* bits */ |
Josh Coalson | bb7f6b9 | 2000-12-10 04:09:52 +0000 | [diff] [blame] | 79 | |
Josh Coalson | 215af57 | 2001-03-27 01:15:58 +0000 | [diff] [blame] | 80 | const unsigned FLAC__SUBFRAME_ZERO_PAD_LEN = 1; /* bits */ |
| 81 | const unsigned FLAC__SUBFRAME_TYPE_LEN = 6; /* bits */ |
| 82 | const unsigned FLAC__SUBFRAME_WASTED_BITS_FLAG_LEN = 1; /* bits */ |
| 83 | |
| 84 | const unsigned FLAC__SUBFRAME_TYPE_CONSTANT_BYTE_ALIGNED_MASK = 0x00; |
| 85 | const unsigned FLAC__SUBFRAME_TYPE_VERBATIM_BYTE_ALIGNED_MASK = 0x02; |
| 86 | const unsigned FLAC__SUBFRAME_TYPE_FIXED_BYTE_ALIGNED_MASK = 0x10; |
| 87 | const unsigned FLAC__SUBFRAME_TYPE_LPC_BYTE_ALIGNED_MASK = 0x40; |
Josh Coalson | 75d0a0b | 2001-01-24 00:42:16 +0000 | [diff] [blame] | 88 | |
Josh Coalson | 57ba6f4 | 2002-06-07 05:27:37 +0000 | [diff] [blame] | 89 | const char * const FLAC__SubframeTypeString[] = { |
Josh Coalson | 75d0a0b | 2001-01-24 00:42:16 +0000 | [diff] [blame] | 90 | "CONSTANT", |
| 91 | "VERBATIM", |
| 92 | "FIXED", |
| 93 | "LPC" |
| 94 | }; |
| 95 | |
Josh Coalson | 57ba6f4 | 2002-06-07 05:27:37 +0000 | [diff] [blame] | 96 | const char * const FLAC__ChannelAssignmentString[] = { |
Josh Coalson | 75d0a0b | 2001-01-24 00:42:16 +0000 | [diff] [blame] | 97 | "INDEPENDENT", |
| 98 | "LEFT_SIDE", |
| 99 | "RIGHT_SIDE", |
| 100 | "MID_SIDE" |
| 101 | }; |
| 102 | |
Josh Coalson | 57ba6f4 | 2002-06-07 05:27:37 +0000 | [diff] [blame] | 103 | const char * const FLAC__FrameNumberTypeString[] = { |
Josh Coalson | 9608463 | 2001-07-16 18:07:12 +0000 | [diff] [blame] | 104 | "FRAME_NUMBER_TYPE_FRAME_NUMBER", |
| 105 | "FRAME_NUMBER_TYPE_SAMPLE_NUMBER" |
| 106 | }; |
| 107 | |
Josh Coalson | cc68251 | 2002-06-08 04:53:42 +0000 | [diff] [blame] | 108 | const char * const FLAC__MetadataTypeString[] = { |
Josh Coalson | 2013572 | 2001-02-23 21:05:53 +0000 | [diff] [blame] | 109 | "STREAMINFO", |
| 110 | "PADDING", |
Josh Coalson | 9b04be7 | 2001-06-14 18:57:53 +0000 | [diff] [blame] | 111 | "APPLICATION", |
Josh Coalson | 7e19b54 | 2002-04-25 05:53:09 +0000 | [diff] [blame] | 112 | "SEEKTABLE", |
| 113 | "VORBIS_COMMENT" |
Josh Coalson | 75d0a0b | 2001-01-24 00:42:16 +0000 | [diff] [blame] | 114 | }; |
Josh Coalson | cc059bc | 2002-05-04 17:35:51 +0000 | [diff] [blame] | 115 | |
Josh Coalson | 0d36cbd | 2002-07-15 05:24:56 +0000 | [diff] [blame] | 116 | FLAC__bool FLAC__format_sample_rate_is_valid(unsigned sample_rate) |
Josh Coalson | cc059bc | 2002-05-04 17:35:51 +0000 | [diff] [blame] | 117 | { |
| 118 | if( |
| 119 | sample_rate == 0 || |
| 120 | sample_rate > FLAC__MAX_SAMPLE_RATE || |
| 121 | ( |
| 122 | sample_rate >= (1u << 16) && |
| 123 | !(sample_rate % 1000 == 0 || sample_rate % 10 == 0) |
| 124 | ) |
| 125 | ) { |
| 126 | return false; |
| 127 | } |
| 128 | else |
| 129 | return true; |
| 130 | } |
Josh Coalson | 0d36cbd | 2002-07-15 05:24:56 +0000 | [diff] [blame] | 131 | |
| 132 | FLAC__bool FLAC__format_seektable_is_legal(const FLAC__StreamMetadata_SeekTable *seek_table) |
| 133 | { |
| 134 | unsigned i; |
| 135 | FLAC__uint64 prev_sample_number = 0; |
| 136 | FLAC__bool got_prev = false; |
| 137 | |
| 138 | FLAC__ASSERT(0 != seek_table); |
| 139 | |
| 140 | for(i = 0; i < seek_table->num_points; i++) { |
| 141 | if(got_prev) { |
Josh Coalson | 5a5de73 | 2002-08-01 06:37:11 +0000 | [diff] [blame^] | 142 | if( |
| 143 | seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER && |
| 144 | seek_table->points[i].sample_number <= prev_sample_number |
| 145 | ) |
Josh Coalson | 0d36cbd | 2002-07-15 05:24:56 +0000 | [diff] [blame] | 146 | return false; |
| 147 | } |
| 148 | prev_sample_number = seek_table->points[i].sample_number; |
| 149 | got_prev = true; |
| 150 | } |
| 151 | |
| 152 | return true; |
| 153 | } |
Josh Coalson | 5a5de73 | 2002-08-01 06:37:11 +0000 | [diff] [blame^] | 154 | |
| 155 | /* used as the sort predicate for qsort() */ |
| 156 | static int seekpoint_compare_(const FLAC__StreamMetadata_SeekPoint *l, const FLAC__StreamMetadata_SeekPoint *r) |
| 157 | { |
| 158 | /* we don't just 'return l->sample_number - r->sample_number' since the result (FLAC__int64) might overflow an 'int' */ |
| 159 | if(l->sample_number == r->sample_number) |
| 160 | return 0; |
| 161 | else if(l->sample_number < r->sample_number) |
| 162 | return -1; |
| 163 | else |
| 164 | return 1; |
| 165 | } |
| 166 | |
| 167 | unsigned FLAC__format_seektable_sort(FLAC__StreamMetadata_SeekTable *seek_table) |
| 168 | { |
| 169 | unsigned i, j; |
| 170 | FLAC__bool first; |
| 171 | |
| 172 | /* sort the seekpoints */ |
| 173 | qsort(seek_table->points, seek_table->num_points, sizeof(FLAC__StreamMetadata_SeekPoint), (int (*)(const void *, const void *))seekpoint_compare_); |
| 174 | |
| 175 | /* uniquify the seekpoints */ |
| 176 | first = true; |
| 177 | for(i = j = 0; i < seek_table->num_points; i++) { |
| 178 | if(seek_table->points[i].sample_number != FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER) { |
| 179 | if(!first) { |
| 180 | if(seek_table->points[i].sample_number == seek_table->points[j-1].sample_number) |
| 181 | continue; |
| 182 | } |
| 183 | } |
| 184 | first = false; |
| 185 | seek_table->points[j++] = seek_table->points[i]; |
| 186 | } |
| 187 | |
| 188 | for(; j < seek_table->num_points; j++) { |
| 189 | seek_table->points[j].sample_number = FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER; |
| 190 | seek_table->points[j].stream_offset = 0; |
| 191 | seek_table->points[j].frame_samples = 0; |
| 192 | } |
| 193 | |
| 194 | return j; |
| 195 | } |