ce188d4d |
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 | } |