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Diffstat (limited to '3rdparty/libflac/src/flac/utils.c')
-rw-r--r-- | 3rdparty/libflac/src/flac/utils.c | 316 |
1 files changed, 316 insertions, 0 deletions
diff --git a/3rdparty/libflac/src/flac/utils.c b/3rdparty/libflac/src/flac/utils.c new file mode 100644 index 00000000000..bca8af761cc --- /dev/null +++ b/3rdparty/libflac/src/flac/utils.c @@ -0,0 +1,316 @@ +/* flac - Command-line FLAC encoder/decoder + * Copyright (C) 2002,2003,2004,2005,2006,2007 Josh Coalson + * + * This program is free software; you can redistribute it and/or + * modify it under the terms of the GNU General Public License + * as published by the Free Software Foundation; either version 2 + * of the License, or (at your option) any later version. + * + * This program 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 General Public License for more details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + */ + +#if HAVE_CONFIG_H +# include <config.h> +#endif + +#include "utils.h" +#include "FLAC/assert.h" +#include "FLAC/metadata.h" +#include <math.h> +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> + +const char *CHANNEL_MASK_TAG = "WAVEFORMATEXTENSIBLE_CHANNEL_MASK"; + +int flac__utils_verbosity_ = 2; + +static FLAC__bool local__parse_uint64_(const char *s, FLAC__uint64 *value) +{ + FLAC__uint64 ret = 0; + char c; + + if(*s == '\0') + return false; + + while('\0' != (c = *s++)) + if(c >= '0' && c <= '9') + ret = ret * 10 + (c - '0'); + else + return false; + + *value = ret; + return true; +} + +static FLAC__bool local__parse_timecode_(const char *s, double *value) +{ + double ret; + unsigned i; + char c; + + /* parse [0-9][0-9]*: */ + c = *s++; + if(c >= '0' && c <= '9') + i = (c - '0'); + else + return false; + while(':' != (c = *s++)) { + if(c >= '0' && c <= '9') + i = i * 10 + (c - '0'); + else + return false; + } + ret = (double)i * 60.; + + /* parse [0-9]*[.,]?[0-9]* i.e. a sign-less rational number (. or , OK for fractional seconds, to support different locales) */ + if(strspn(s, "1234567890.,") != strlen(s)) + return false; + { + const char *p = strpbrk(s, ".,"); + if(p && 0 != strpbrk(++p, ".,")) + return false; + } + ret += atof(s); + + *value = ret; + return true; +} + +static FLAC__bool local__parse_cue_(const char *s, const char *end, unsigned *track, unsigned *index) +{ + FLAC__bool got_track = false, got_index = false; + unsigned t = 0, i = 0; + char c; + + while(end? s < end : *s != '\0') { + c = *s++; + if(c >= '0' && c <= '9') { + t = t * 10 + (c - '0'); + got_track = true; + } + else if(c == '.') + break; + else + return false; + } + while(end? s < end : *s != '\0') { + c = *s++; + if(c >= '0' && c <= '9') { + i = i * 10 + (c - '0'); + got_index = true; + } + else + return false; + } + *track = t; + *index = i; + return got_track && got_index; +} + +/* + * this only works with sorted cuesheets (the spec strongly recommends but + * does not require sorted cuesheets). but if it's not sorted, picking a + * nearest cue point has no significance. + */ +static FLAC__uint64 local__find_closest_cue_(const FLAC__StreamMetadata_CueSheet *cuesheet, unsigned track, unsigned index, FLAC__uint64 total_samples, FLAC__bool look_forward) +{ + int t, i; + if(look_forward) { + for(t = 0; t < (int)cuesheet->num_tracks; t++) + for(i = 0; i < (int)cuesheet->tracks[t].num_indices; i++) + if(cuesheet->tracks[t].number > track || (cuesheet->tracks[t].number == track && cuesheet->tracks[t].indices[i].number >= index)) + return cuesheet->tracks[t].offset + cuesheet->tracks[t].indices[i].offset; + return total_samples; + } + else { + for(t = (int)cuesheet->num_tracks - 1; t >= 0; t--) + for(i = (int)cuesheet->tracks[t].num_indices - 1; i >= 0; i--) + if(cuesheet->tracks[t].number < track || (cuesheet->tracks[t].number == track && cuesheet->tracks[t].indices[i].number <= index)) + return cuesheet->tracks[t].offset + cuesheet->tracks[t].indices[i].offset; + return 0; + } +} + +void flac__utils_printf(FILE *stream, int level, const char *format, ...) +{ + if(flac__utils_verbosity_ >= level) { + va_list args; + + FLAC__ASSERT(0 != format); + + va_start(args, format); + + (void) vfprintf(stream, format, args); + + va_end(args); + } +} + +#ifdef FLAC__VALGRIND_TESTING +size_t flac__utils_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream) +{ + size_t ret = fwrite(ptr, size, nmemb, stream); + if(!ferror(stream)) + fflush(stream); + return ret; +} +#endif + +FLAC__bool flac__utils_parse_skip_until_specification(const char *s, utils__SkipUntilSpecification *spec) +{ + FLAC__uint64 val; + FLAC__bool is_negative = false; + + FLAC__ASSERT(0 != spec); + + spec->is_relative = false; + spec->value_is_samples = true; + spec->value.samples = 0; + + if(0 != s) { + if(s[0] == '-') { + is_negative = true; + spec->is_relative = true; + s++; + } + else if(s[0] == '+') { + spec->is_relative = true; + s++; + } + + if(local__parse_uint64_(s, &val)) { + spec->value_is_samples = true; + spec->value.samples = (FLAC__int64)val; + if(is_negative) + spec->value.samples = -(spec->value.samples); + } + else { + double d; + if(!local__parse_timecode_(s, &d)) + return false; + spec->value_is_samples = false; + spec->value.seconds = d; + if(is_negative) + spec->value.seconds = -(spec->value.seconds); + } + } + + return true; +} + +void flac__utils_canonicalize_skip_until_specification(utils__SkipUntilSpecification *spec, unsigned sample_rate) +{ + FLAC__ASSERT(0 != spec); + if(!spec->value_is_samples) { + spec->value.samples = (FLAC__int64)(spec->value.seconds * (double)sample_rate); + spec->value_is_samples = true; + } +} + +FLAC__bool flac__utils_parse_cue_specification(const char *s, utils__CueSpecification *spec) +{ + const char *start = s, *end = 0; + + FLAC__ASSERT(0 != spec); + + spec->has_start_point = spec->has_end_point = false; + + s = strchr(s, '-'); + + if(0 != s) { + if(s == start) + start = 0; + end = s+1; + if(*end == '\0') + end = 0; + } + + if(start) { + if(!local__parse_cue_(start, s, &spec->start_track, &spec->start_index)) + return false; + spec->has_start_point = true; + } + + if(end) { + if(!local__parse_cue_(end, 0, &spec->end_track, &spec->end_index)) + return false; + spec->has_end_point = true; + } + + return true; +} + +void flac__utils_canonicalize_cue_specification(const utils__CueSpecification *cue_spec, const FLAC__StreamMetadata_CueSheet *cuesheet, FLAC__uint64 total_samples, utils__SkipUntilSpecification *skip_spec, utils__SkipUntilSpecification *until_spec) +{ + FLAC__ASSERT(0 != cue_spec); + FLAC__ASSERT(0 != cuesheet); + FLAC__ASSERT(0 != total_samples); + FLAC__ASSERT(0 != skip_spec); + FLAC__ASSERT(0 != until_spec); + + skip_spec->is_relative = false; + skip_spec->value_is_samples = true; + + until_spec->is_relative = false; + until_spec->value_is_samples = true; + + if(cue_spec->has_start_point) + skip_spec->value.samples = local__find_closest_cue_(cuesheet, cue_spec->start_track, cue_spec->start_index, total_samples, /*look_forward=*/false); + else + skip_spec->value.samples = 0; + + if(cue_spec->has_end_point) + until_spec->value.samples = local__find_closest_cue_(cuesheet, cue_spec->end_track, cue_spec->end_index, total_samples, /*look_forward=*/true); + else + until_spec->value.samples = total_samples; +} + +FLAC__bool flac__utils_set_channel_mask_tag(FLAC__StreamMetadata *object, FLAC__uint32 channel_mask) +{ + FLAC__StreamMetadata_VorbisComment_Entry entry = { 0, 0 }; + char tag[128]; + + FLAC__ASSERT(object); + FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); + FLAC__ASSERT(strlen(CHANNEL_MASK_TAG+1+2+16+1) <= sizeof(tag)); /* +1 for =, +2 for 0x, +16 for digits, +1 for NUL */ + entry.entry = (FLAC__byte*)tag; +#if defined _MSC_VER || defined __MINGW32__ + if((entry.length = _snprintf(tag, sizeof(tag), "%s=0x%04X", CHANNEL_MASK_TAG, (unsigned)channel_mask)) >= sizeof(tag)) +#else + if((entry.length = snprintf(tag, sizeof(tag), "%s=0x%04X", CHANNEL_MASK_TAG, (unsigned)channel_mask)) >= sizeof(tag)) +#endif + return false; + if(!FLAC__metadata_object_vorbiscomment_replace_comment(object, entry, /*all=*/true, /*copy=*/true)) + return false; + return true; +} + +FLAC__bool flac__utils_get_channel_mask_tag(const FLAC__StreamMetadata *object, FLAC__uint32 *channel_mask) +{ + int offset; + unsigned val; + char *p; + FLAC__ASSERT(object); + FLAC__ASSERT(object->type == FLAC__METADATA_TYPE_VORBIS_COMMENT); + if(0 > (offset = FLAC__metadata_object_vorbiscomment_find_entry_from(object, /*offset=*/0, CHANNEL_MASK_TAG))) + return false; + if(object->data.vorbis_comment.comments[offset].length < strlen(CHANNEL_MASK_TAG)+4) + return false; + if(0 == (p = strchr((const char *)object->data.vorbis_comment.comments[offset].entry, '='))) /* should never happen, but just in case */ + return false; + if(strncmp(p, "=0x", 3)) + return false; + if(sscanf(p+3, "%x", &val) != 1) + return false; + *channel_mask = val; + return true; +} |