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104 lines
3.7 KiB
C
104 lines
3.7 KiB
C
/* grabbag - Convenience lib for various routines common to several tools
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* Copyright (C) 2002,2003,2004,2005,2006,2007,2008,2009 Josh Coalson
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 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 "share/grabbag.h"
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#include "share/compat.h"
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#include "FLAC/assert.h"
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#include <stdlib.h> /* for atoi() */
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#include <string.h>
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FLAC__bool grabbag__seektable_convert_specification_to_template(const char *spec, FLAC__bool only_explicit_placeholders, FLAC__uint64 total_samples_to_encode, unsigned sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
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{
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unsigned i;
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const char *pt;
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FLAC__ASSERT(0 != spec);
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FLAC__ASSERT(0 != seektable_template);
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FLAC__ASSERT(seektable_template->type = FLAC__METADATA_TYPE_SEEKTABLE);
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if(0 != spec_has_real_points)
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*spec_has_real_points = false;
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for(pt = spec, i = 0; pt && *pt; i++) {
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const char *q = strchr(pt, ';');
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FLAC__ASSERT(0 != q);
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if(q > pt) {
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if(0 == strncmp(pt, "X;", 2)) { /* -S X */
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if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
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return false;
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}
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else if(q[-1] == 'x') { /* -S #x */
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if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
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if(0 != spec_has_real_points)
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*spec_has_real_points = true;
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if(!only_explicit_placeholders) {
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const int n = (unsigned)atoi(pt);
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if(n > 0)
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if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (unsigned)n, total_samples_to_encode))
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return false;
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}
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}
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}
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else if(q[-1] == 's') { /* -S #s */
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if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
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FLAC__ASSERT(sample_rate > 0);
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if(0 != spec_has_real_points)
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*spec_has_real_points = true;
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if(!only_explicit_placeholders) {
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const double sec = atof(pt);
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if(sec > 0.0) {
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unsigned samples = (unsigned)(sec * (double)sample_rate);
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if(samples > 0) {
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/* +1 for the initial point at sample 0 */
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if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
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return false;
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}
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}
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}
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}
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}
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else { /* -S # */
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if(0 != spec_has_real_points)
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*spec_has_real_points = true;
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if(!only_explicit_placeholders) {
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char *endptr;
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const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
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if(
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(n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
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(total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
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)
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if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
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return false;
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}
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}
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}
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pt = ++q;
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}
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if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
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return false;
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return true;
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}
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