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[flac.git] / src / share / grabbag / seektable.c
1 /* grabbag - Convenience lib for various routines common to several tools
2  * Copyright (C) 2002-2009  Josh Coalson
3  * Copyright (C) 2011-2016  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
30 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)
31 {
32         unsigned 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 = (unsigned)atoi(pt);
57                                                 if(n > 0)
58                                                         if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (unsigned)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) { /* we can only do these if we know the number of samples to encode up front */
65                                         FLAC__ASSERT(sample_rate > 0);
66                                         if(0 != spec_has_real_points)
67                                                 *spec_has_real_points = true;
68                                         if(!only_explicit_placeholders) {
69                                                 const double sec = atof(pt);
70                                                 if(sec > 0.0) {
71                                                         unsigned samples = (unsigned)(sec * (double)sample_rate);
72                                                         /* Restrict seekpoints to two per second of audio. */
73                                                         samples = samples < sample_rate / 2 ? sample_rate / 2 : samples;
74                                                         if(samples > 0) {
75                                                                 /* +1 for the initial point at sample 0 */
76                                                                 if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
77                                                                         return false;
78                                                         }
79                                                 }
80                                         }
81                                 }
82                         }
83                         else { /* -S # */
84                                 if(0 != spec_has_real_points)
85                                         *spec_has_real_points = true;
86                                 if(!only_explicit_placeholders) {
87                                         char *endptr;
88                                         const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
89                                         if(
90                                                 (n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
91                                                 (total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
92                                         )
93                                                 if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
94                                                         return false;
95                                 }
96                         }
97                 }
98
99                 pt = ++q;
100         }
101
102         if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
103                 return false;
104
105         return true;
106 }