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Diffstat (limited to '')
| -rw-r--r-- | src/share/grabbag/seektable.c | 105 |
1 files changed, 105 insertions, 0 deletions
diff --git a/src/share/grabbag/seektable.c b/src/share/grabbag/seektable.c new file mode 100644 index 0000000..01caa99 --- /dev/null +++ b/src/share/grabbag/seektable.c @@ -0,0 +1,105 @@ +/* grabbag - Convenience lib for various routines common to several tools + * Copyright (C) 2002-2009 Josh Coalson + * Copyright (C) 2011-2023 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 && sample_rate > 0) { /* we can only do these if we know the number of samples and sample rate to encode up front */ + 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; +} |