/* libFLAC - Free Lossless Audio Codec library * Copyright (C) 2000-2009 Josh Coalson * Copyright (C) 2011-2014 Xiph.Org Foundation * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * - Neither the name of the Xiph.org Foundation nor the names of its * contributors may be used to endorse or promote products derived from * this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #ifdef HAVE_CONFIG_H # include #endif #include #include /* for qsort() */ #include /* for memset() */ #include "FLAC/assert.h" #include "FLAC/format.h" #include "share/compat.h" #include "private/format.h" #include "private/macros.h" /* VERSION should come from configure */ FLAC_API const char *FLAC__VERSION_STRING = VERSION; FLAC_API const char *FLAC__VENDOR_STRING = "reference libFLAC " VERSION " 20141125"; FLAC_API const FLAC__byte FLAC__STREAM_SYNC_STRING[4] = { 'f','L','a','C' }; FLAC_API const unsigned FLAC__STREAM_SYNC = 0x664C6143; FLAC_API const unsigned FLAC__STREAM_SYNC_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_BLOCK_SIZE_LEN = 16; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_BLOCK_SIZE_LEN = 16; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MIN_FRAME_SIZE_LEN = 24; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MAX_FRAME_SIZE_LEN = 24; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_SAMPLE_RATE_LEN = 20; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_CHANNELS_LEN = 3; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_BITS_PER_SAMPLE_LEN = 5; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_TOTAL_SAMPLES_LEN = 36; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_STREAMINFO_MD5SUM_LEN = 128; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_APPLICATION_ID_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_SAMPLE_NUMBER_LEN = 64; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_STREAM_OFFSET_LEN = 64; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_SEEKPOINT_FRAME_SAMPLES_LEN = 16; /* bits */ FLAC_API const FLAC__uint64 FLAC__STREAM_METADATA_SEEKPOINT_PLACEHOLDER = FLAC__U64L(0xffffffffffffffff); FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_ENTRY_LENGTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_VORBIS_COMMENT_NUM_COMMENTS_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_OFFSET_LEN = 64; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_NUMBER_LEN = 8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_INDEX_RESERVED_LEN = 3*8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_OFFSET_LEN = 64; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUMBER_LEN = 8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_ISRC_LEN = 12*8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_TYPE_LEN = 1; /* bit */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_PRE_EMPHASIS_LEN = 1; /* bit */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_RESERVED_LEN = 6+13*8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_TRACK_NUM_INDICES_LEN = 8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_MEDIA_CATALOG_NUMBER_LEN = 128*8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_LEAD_IN_LEN = 64; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_IS_CD_LEN = 1; /* bit */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_RESERVED_LEN = 7+258*8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_CUESHEET_NUM_TRACKS_LEN = 8; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_TYPE_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_MIME_TYPE_LENGTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DESCRIPTION_LENGTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_WIDTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_HEIGHT_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DEPTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_COLORS_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_PICTURE_DATA_LENGTH_LEN = 32; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_IS_LAST_LEN = 1; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_TYPE_LEN = 7; /* bits */ FLAC_API const unsigned FLAC__STREAM_METADATA_LENGTH_LEN = 24; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC = 0x3ffe; FLAC_API const unsigned FLAC__FRAME_HEADER_SYNC_LEN = 14; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_RESERVED_LEN = 1; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCKING_STRATEGY_LEN = 1; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_BLOCK_SIZE_LEN = 4; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_SAMPLE_RATE_LEN = 4; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_CHANNEL_ASSIGNMENT_LEN = 4; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_BITS_PER_SAMPLE_LEN = 3; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_ZERO_PAD_LEN = 1; /* bits */ FLAC_API const unsigned FLAC__FRAME_HEADER_CRC_LEN = 8; /* bits */ FLAC_API const unsigned FLAC__FRAME_FOOTER_CRC_LEN = 16; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_TYPE_LEN = 2; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ORDER_LEN = 4; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_PARAMETER_LEN = 4; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE2_PARAMETER_LEN = 5; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_RAW_LEN = 5; /* bits */ FLAC_API const unsigned FLAC__ENTROPY_CODING_METHOD_PARTITIONED_RICE_ESCAPE_PARAMETER = 15; /* == (1< FLAC__MAX_SAMPLE_RATE) { return false; } else return true; } FLAC_API FLAC__bool FLAC__format_blocksize_is_subset(unsigned blocksize, unsigned sample_rate) { if(blocksize > 16384) return false; else if(sample_rate <= 48000 && blocksize > 4608) return false; else return true; } FLAC_API FLAC__bool FLAC__format_sample_rate_is_subset(unsigned sample_rate) { if( !FLAC__format_sample_rate_is_valid(sample_rate) || ( sample_rate >= (1u << 16) && !(sample_rate % 1000 == 0 || sample_rate % 10 == 0) ) ) { return false; } else return true; } /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ FLAC_API 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; } /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ FLAC_API 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; } /* * also disallows non-shortest-form encodings, c.f. * http://www.unicode.org/versions/corrigendum1.html * and a more clear explanation at the end of this section: * http://www.cl.cam.ac.uk/~mgk25/unicode.html#utf-8 */ static unsigned utf8len_(const FLAC__byte *utf8) { FLAC__ASSERT(0 != utf8); if ((utf8[0] & 0x80) == 0) { return 1; } else if ((utf8[0] & 0xE0) == 0xC0 && (utf8[1] & 0xC0) == 0x80) { if ((utf8[0] & 0xFE) == 0xC0) /* overlong sequence check */ return 0; return 2; } else if ((utf8[0] & 0xF0) == 0xE0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80) { if (utf8[0] == 0xE0 && (utf8[1] & 0xE0) == 0x80) /* overlong sequence check */ return 0; /* illegal surrogates check (U+D800...U+DFFF and U+FFFE...U+FFFF) */ if (utf8[0] == 0xED && (utf8[1] & 0xE0) == 0xA0) /* D800-DFFF */ return 0; if (utf8[0] == 0xEF && utf8[1] == 0xBF && (utf8[2] & 0xFE) == 0xBE) /* FFFE-FFFF */ return 0; return 3; } else if ((utf8[0] & 0xF8) == 0xF0 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80) { if (utf8[0] == 0xF0 && (utf8[1] & 0xF0) == 0x80) /* overlong sequence check */ return 0; return 4; } else if ((utf8[0] & 0xFC) == 0xF8 && (utf8[1] & 0xC0) == 0x80 && (utf8[2] & 0xC0) == 0x80 && (utf8[3] & 0xC0) == 0x80 && (utf8[4] & 0xC0) == 0x80) { if (utf8[0] == 0xF8 && (utf8[1] & 0xF8) == 0x80) /* overlong sequence check */ return 0; return 5; } 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) { if (utf8[0] == 0xFC && (utf8[1] & 0xFC) == 0x80) /* overlong sequence check */ return 0; return 6; } else { return 0; } } FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_name_is_legal(const char *name) { char c; for(c = *name; c; c = *(++name)) if(c < 0x20 || c == 0x3d || c > 0x7d) return false; return true; } FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_value_is_legal(const FLAC__byte *value, unsigned length) { if(length == (unsigned)(-1)) { while(*value) { unsigned n = utf8len_(value); if(n == 0) return false; value += n; } } else { const FLAC__byte *end = value + length; while(value < end) { unsigned n = utf8len_(value); if(n == 0) return false; value += n; } if(value != end) return false; } return true; } FLAC_API FLAC__bool FLAC__format_vorbiscomment_entry_is_legal(const FLAC__byte *entry, unsigned length) { const FLAC__byte *s, *end; for(s = entry, end = s + length; s < end && *s != '='; s++) { if(*s < 0x20 || *s > 0x7D) return false; } if(s == end) return false; s++; /* skip '=' */ while(s < end) { unsigned n = utf8len_(s); if(n == 0) return false; s += n; } if(s != end) return false; return true; } /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ FLAC_API FLAC__bool FLAC__format_cuesheet_is_legal(const FLAC__StreamMetadata_CueSheet *cue_sheet, FLAC__bool check_cd_da_subset, const char **violation) { unsigned i, j; if(check_cd_da_subset) { if(cue_sheet->lead_in < 2 * 44100) { if(violation) *violation = "CD-DA cue sheet must have a lead-in length of at least 2 seconds"; return false; } if(cue_sheet->lead_in % 588 != 0) { if(violation) *violation = "CD-DA cue sheet lead-in length must be evenly divisible by 588 samples"; return false; } } if(cue_sheet->num_tracks == 0) { if(violation) *violation = "cue sheet must have at least one track (the lead-out)"; return false; } if(check_cd_da_subset && cue_sheet->tracks[cue_sheet->num_tracks-1].number != 170) { if(violation) *violation = "CD-DA cue sheet must have a lead-out track number 170 (0xAA)"; return false; } for(i = 0; i < cue_sheet->num_tracks; i++) { if(cue_sheet->tracks[i].number == 0) { if(violation) *violation = "cue sheet may not have a track number 0"; return false; } if(check_cd_da_subset) { if(!((cue_sheet->tracks[i].number >= 1 && cue_sheet->tracks[i].number <= 99) || cue_sheet->tracks[i].number == 170)) { if(violation) *violation = "CD-DA cue sheet track number must be 1-99 or 170"; return false; } } if(check_cd_da_subset && cue_sheet->tracks[i].offset % 588 != 0) { if(violation) { if(i == cue_sheet->num_tracks-1) /* the lead-out track... */ *violation = "CD-DA cue sheet lead-out offset must be evenly divisible by 588 samples"; else *violation = "CD-DA cue sheet track offset must be evenly divisible by 588 samples"; } return false; } if(i < cue_sheet->num_tracks - 1) { if(cue_sheet->tracks[i].num_indices == 0) { if(violation) *violation = "cue sheet track must have at least one index point"; return false; } if(cue_sheet->tracks[i].indices[0].number > 1) { if(violation) *violation = "cue sheet track's first index number must be 0 or 1"; return false; } } for(j = 0; j < cue_sheet->tracks[i].num_indices; j++) { if(check_cd_da_subset && cue_sheet->tracks[i].indices[j].offset % 588 != 0) { if(violation) *violation = "CD-DA cue sheet track index offset must be evenly divisible by 588 samples"; return false; } if(j > 0) { if(cue_sheet->tracks[i].indices[j].number != cue_sheet->tracks[i].indices[j-1].number + 1) { if(violation) *violation = "cue sheet track index numbers must increase by 1"; return false; } } } } return true; } /* @@@@ add to unit tests; it is already indirectly tested by the metadata_object tests */ FLAC_API FLAC__bool FLAC__format_picture_is_legal(const FLAC__StreamMetadata_Picture *picture, const char **violation) { char *p; FLAC__byte *b; for(p = picture->mime_type; *p; p++) { if(*p < 0x20 || *p > 0x7e) { if(violation) *violation = "MIME type string must contain only printable ASCII characters (0x20-0x7e)"; return false; } } for(b = picture->description; *b; ) { unsigned n = utf8len_(b); if(n == 0) { if(violation) *violation = "description string must be valid UTF-8"; return false; } b += n; } return true; } /* * These routines are private to libFLAC */ 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 flac_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( (max_rice_partition_order == 0 && blocksize >= predictor_order) || (max_rice_partition_order > 0 && 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; memset(object->raw_bits, 0, sizeof(unsigned)*(1 << max_partition_order)); object->capacity_by_order = max_partition_order; } return true; }