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/* grabbag - Convenience lib for various routines common to several tools
* Copyright (C) 2002-2009 Josh Coalson
* Copyright (C) 2011-2022 Xiph.Org Foundation
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "share/grabbag.h"
#include "share/compat.h"
#include "FLAC/assert.h"
#include <stdlib.h> /* for atoi() */
#include <string.h>
FLAC__bool grabbag__seektable_convert_specification_to_template(const char *spec, FLAC__bool only_explicit_placeholders, FLAC__uint64 total_samples_to_encode, uint32_t sample_rate, FLAC__StreamMetadata *seektable_template, FLAC__bool *spec_has_real_points)
{
uint32_t i;
const char *pt;
FLAC__ASSERT(0 != spec);
FLAC__ASSERT(0 != seektable_template);
FLAC__ASSERT(seektable_template->type == FLAC__METADATA_TYPE_SEEKTABLE);
if(0 != spec_has_real_points)
*spec_has_real_points = false;
for(pt = spec, i = 0; pt && *pt; i++) {
const char *q = strchr(pt, ';');
FLAC__ASSERT(0 != q);
if(q > pt) {
if(0 == strncmp(pt, "X;", 2)) { /* -S X */
if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
return false;
}
else if(q[-1] == 'x') { /* -S #x */
if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
if(0 != spec_has_real_points)
*spec_has_real_points = true;
if(!only_explicit_placeholders) {
const int n = (uint32_t)atoi(pt);
if(n > 0)
if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (uint32_t)n, total_samples_to_encode))
return false;
}
}
}
else if(q[-1] == 's') { /* -S #s */
if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
FLAC__ASSERT(sample_rate > 0);
if(0 != spec_has_real_points)
*spec_has_real_points = true;
if(!only_explicit_placeholders) {
const double sec = atof(pt);
if(sec > 0.0) {
uint32_t samples = (uint32_t)(sec * (double)sample_rate);
/* Restrict seekpoints to two per second of audio. */
samples = samples < sample_rate / 2 ? sample_rate / 2 : samples;
if(samples > 0) {
/* +1 for the initial point at sample 0 */
if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
return false;
}
}
}
}
}
else { /* -S # */
if(0 != spec_has_real_points)
*spec_has_real_points = true;
if(!only_explicit_placeholders) {
char *endptr;
const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
if(
(n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
(total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
)
if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
return false;
}
}
}
pt = ++q;
}
if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
return false;
return true;
}
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