271 lines
6.7 KiB
C
271 lines
6.7 KiB
C
/* flac - Command-line FLAC encoder/decoder
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* Copyright (C) 2002,2003,2004,2005 Josh Coalson
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#if HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include "utils.h"
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#include "FLAC/assert.h"
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#include <math.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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int flac__utils_verbosity_ = 2;
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static FLAC__bool local__parse_uint64_(const char *s, FLAC__uint64 *value)
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{
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FLAC__uint64 ret = 0;
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char c;
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if(*s == '\0')
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return false;
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while('\0' != (c = *s++))
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if(c >= '0' && c <= '9')
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ret = ret * 10 + (c - '0');
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else
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return false;
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*value = ret;
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return true;
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}
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static FLAC__bool local__parse_timecode_(const char *s, double *value)
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{
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double ret;
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unsigned i;
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char c;
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/* parse [0-9][0-9]*: */
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c = *s++;
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if(c >= '0' && c <= '9')
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i = (c - '0');
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else
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return false;
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while(':' != (c = *s++)) {
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if(c >= '0' && c <= '9')
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i = i * 10 + (c - '0');
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else
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return false;
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}
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ret = (double)i * 60.;
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/* parse [0-9]*[.]?[0-9]* i.e. a sign-less rational number */
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if(strspn(s, "1234567890.") != strlen(s))
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return false;
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{
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const char *p = strchr(s, '.');
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if(p && 0 != strchr(++p, '.'))
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return false;
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}
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ret += atof(s);
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*value = ret;
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return true;
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}
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static FLAC__bool local__parse_cue_(const char *s, const char *end, unsigned *track, unsigned *index)
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{
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FLAC__bool got_track = false, got_index = false;
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unsigned t = 0, i = 0;
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char c;
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while(end? s < end : *s != '\0') {
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c = *s++;
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if(c >= '0' && c <= '9') {
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t = t * 10 + (c - '0');
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got_track = true;
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}
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else if(c == '.')
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break;
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else
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return false;
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}
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while(end? s < end : *s != '\0') {
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c = *s++;
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if(c >= '0' && c <= '9') {
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i = i * 10 + (c - '0');
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got_index = true;
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}
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else
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return false;
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}
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*track = t;
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*index = i;
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return got_track && got_index;
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}
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/*
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* @@@ this only works with sorted cuesheets (the spec strongly recommends but
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* does not require sorted cuesheets). but if it's not sorted, picking a
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* nearest cue point has no significance.
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*/
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static FLAC__uint64 local__find_closest_cue_(const FLAC__StreamMetadata_CueSheet *cuesheet, unsigned track, unsigned index, FLAC__uint64 total_samples, FLAC__bool look_forward)
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{
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int t, i;
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if(look_forward) {
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for(t = 0; t < (int)cuesheet->num_tracks; t++)
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for(i = 0; i < (int)cuesheet->tracks[t].num_indices; i++)
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if(cuesheet->tracks[t].number > track || (cuesheet->tracks[t].number == track && cuesheet->tracks[t].indices[i].number >= index))
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return cuesheet->tracks[t].offset + cuesheet->tracks[t].indices[i].offset;
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return total_samples;
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}
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else {
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for(t = (int)cuesheet->num_tracks - 1; t >= 0; t--)
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for(i = (int)cuesheet->tracks[t].num_indices - 1; i >= 0; i--)
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if(cuesheet->tracks[t].number < track || (cuesheet->tracks[t].number == track && cuesheet->tracks[t].indices[i].number <= index))
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return cuesheet->tracks[t].offset + cuesheet->tracks[t].indices[i].offset;
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return 0;
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}
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}
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void flac__utils_printf(FILE *stream, int level, const char *format, ...)
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{
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if(flac__utils_verbosity_ >= level) {
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va_list args;
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FLAC__ASSERT(0 != format);
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va_start(args, format);
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(void) vfprintf(stream, format, args);
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va_end(args);
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}
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}
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#ifdef FLAC__VALGRIND_TESTING
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size_t flac__utils_fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream)
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{
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size_t ret = fwrite(ptr, size, nmemb, stream);
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if(!ferror(stream))
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fflush(stream);
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return ret;
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}
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#endif
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FLAC__bool flac__utils_parse_skip_until_specification(const char *s, utils__SkipUntilSpecification *spec)
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{
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FLAC__uint64 val;
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FLAC__bool is_negative = false;
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FLAC__ASSERT(0 != spec);
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spec->is_relative = false;
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spec->value_is_samples = true;
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spec->value.samples = 0;
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if(0 != s) {
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if(s[0] == '-') {
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is_negative = true;
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spec->is_relative = true;
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s++;
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}
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else if(s[0] == '+') {
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spec->is_relative = true;
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s++;
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}
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if(local__parse_uint64_(s, &val)) {
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spec->value_is_samples = true;
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spec->value.samples = (FLAC__int64)val;
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if(is_negative)
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spec->value.samples = -(spec->value.samples);
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}
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else {
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double d;
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if(!local__parse_timecode_(s, &d))
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return false;
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spec->value_is_samples = false;
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spec->value.seconds = d;
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if(is_negative)
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spec->value.seconds = -(spec->value.seconds);
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}
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}
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return true;
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}
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void flac__utils_canonicalize_skip_until_specification(utils__SkipUntilSpecification *spec, unsigned sample_rate)
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{
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FLAC__ASSERT(0 != spec);
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if(!spec->value_is_samples) {
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spec->value.samples = (FLAC__int64)(spec->value.seconds * (double)sample_rate);
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spec->value_is_samples = true;
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}
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}
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FLAC__bool flac__utils_parse_cue_specification(const char *s, utils__CueSpecification *spec)
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{
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const char *start = s, *end = 0;
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FLAC__ASSERT(0 != spec);
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spec->has_start_point = spec->has_end_point = false;
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s = strchr(s, '-');
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if(0 != s) {
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if(s == start)
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start = 0;
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end = s+1;
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if(*end == '\0')
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end = 0;
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}
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if(start) {
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if(!local__parse_cue_(start, s, &spec->start_track, &spec->start_index))
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return false;
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spec->has_start_point = true;
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}
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if(end) {
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if(!local__parse_cue_(end, 0, &spec->end_track, &spec->end_index))
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return false;
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spec->has_end_point = true;
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}
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return true;
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}
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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)
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{
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FLAC__ASSERT(0 != cue_spec);
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FLAC__ASSERT(0 != cuesheet);
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FLAC__ASSERT(0 != total_samples);
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FLAC__ASSERT(0 != skip_spec);
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FLAC__ASSERT(0 != until_spec);
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skip_spec->is_relative = false;
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skip_spec->value_is_samples = true;
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until_spec->is_relative = false;
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until_spec->value_is_samples = true;
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if(cue_spec->has_start_point)
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skip_spec->value.samples = local__find_closest_cue_(cuesheet, cue_spec->start_track, cue_spec->start_index, total_samples, /*look_forward=*/false);
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else
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skip_spec->value.samples = 0;
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if(cue_spec->has_end_point)
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until_spec->value.samples = local__find_closest_cue_(cuesheet, cue_spec->end_track, cue_spec->end_index, total_samples, /*look_forward=*/true);
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else
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until_spec->value.samples = total_samples;
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}
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