1 /* grabbag - Convenience lib for various routines common to several tools
2 * Copyright (C) 2002-2009 Josh Coalson
3 * Copyright (C) 2011-2023 Xiph.Org Foundation
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 of the License, or (at your option) any later version.
9 *
10 * This library is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
14 *
15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19
20 #ifdef HAVE_CONFIG_H
21 # include <config.h>
22 #endif
23
24 #include "share/grabbag.h"
25 #include "share/compat.h"
26 #include "FLAC/assert.h"
27 #include <stdlib.h> /* for atoi() */
28 #include <string.h>
29
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)30 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)
31 {
32 uint32_t i;
33 const char *pt;
34
35 FLAC__ASSERT(0 != spec);
36 FLAC__ASSERT(0 != seektable_template);
37 FLAC__ASSERT(seektable_template->type == FLAC__METADATA_TYPE_SEEKTABLE);
38
39 if(0 != spec_has_real_points)
40 *spec_has_real_points = false;
41
42 for(pt = spec, i = 0; pt && *pt; i++) {
43 const char *q = strchr(pt, ';');
44 FLAC__ASSERT(0 != q);
45
46 if(q > pt) {
47 if(0 == strncmp(pt, "X;", 2)) { /* -S X */
48 if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
49 return false;
50 }
51 else if(q[-1] == 'x') { /* -S #x */
52 if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
53 if(0 != spec_has_real_points)
54 *spec_has_real_points = true;
55 if(!only_explicit_placeholders) {
56 const int n = (uint32_t)atoi(pt);
57 if(n > 0)
58 if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (uint32_t)n, total_samples_to_encode))
59 return false;
60 }
61 }
62 }
63 else if(q[-1] == 's') { /* -S #s */
64 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 */
65 if(0 != spec_has_real_points)
66 *spec_has_real_points = true;
67 if(!only_explicit_placeholders) {
68 const double sec = atof(pt);
69 if(sec > 0.0) {
70 uint32_t samples = (uint32_t)(sec * (double)sample_rate);
71 /* Restrict seekpoints to two per second of audio. */
72 samples = samples < sample_rate / 2 ? sample_rate / 2 : samples;
73 if(samples > 0) {
74 /* +1 for the initial point at sample 0 */
75 if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
76 return false;
77 }
78 }
79 }
80 }
81 }
82 else { /* -S # */
83 if(0 != spec_has_real_points)
84 *spec_has_real_points = true;
85 if(!only_explicit_placeholders) {
86 char *endptr;
87 const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
88 if(
89 (n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
90 (total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
91 )
92 if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
93 return false;
94 }
95 }
96 }
97
98 pt = ++q;
99 }
100
101 if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
102 return false;
103
104 return true;
105 }
106