final merge down from 1.1.2 maintenance branch (cvs up -j FLAC_RELEASE_1_1_2_MAINTENA...
[flac.git] / src / share / grabbag / seektable.c
1 /* grabbag - Convenience lib for various routines common to several tools
2  * Copyright (C) 2002,2003,2004,2005,2006  Josh Coalson
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the Free Software
16  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18
19 #if HAVE_CONFIG_H
20 #  include <config.h>
21 #endif
22
23 #include "share/grabbag.h"
24 #include "FLAC/assert.h"
25 #include <stdlib.h> /* for atoi() */
26 #include <string.h>
27
28 #ifdef _MSC_VER
29 /* There's no strtoll() in MSVC6 so we just write a specialized one */
30 static FLAC__int64 local__strtoll(const char *src, char **endptr)
31 {
32         FLAC__bool neg = false;
33         FLAC__int64 ret = 0;
34         int c;
35         FLAC__ASSERT(0 != src);
36         if(*src == '-') {
37                 neg = true;
38                 src++;
39         }
40         while(0 != (c = *src)) {
41                 c -= '0';
42                 if(c >= 0 && c <= 9)
43                         ret = (ret * 10) + c;
44                 else
45                         break;
46                 src++;
47         }
48         if(endptr)
49                 *endptr = (char*)src;
50         return neg? -ret : ret;
51 }
52 #endif
53
54 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)
55 {
56         unsigned i;
57         const char *pt;
58
59         FLAC__ASSERT(0 != spec);
60         FLAC__ASSERT(0 != seektable_template);
61         FLAC__ASSERT(seektable_template->type = FLAC__METADATA_TYPE_SEEKTABLE);
62
63         if(0 != spec_has_real_points)
64                 *spec_has_real_points = false;
65
66         for(pt = spec, i = 0; pt && *pt; i++) {
67                 const char *q = strchr(pt, ';');
68                 FLAC__ASSERT(0 != q);
69
70                 if(q > pt) {
71                         if(0 == strncmp(pt, "X;", 2)) { /* -S X */
72                                 if(!FLAC__metadata_object_seektable_template_append_placeholders(seektable_template, 1))
73                                         return false;
74                         }
75                         else if(q[-1] == 'x') { /* -S #x */
76                                 if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
77                                         if(0 != spec_has_real_points)
78                                                 *spec_has_real_points = true;
79                                         if(!only_explicit_placeholders) {
80                                                 const int n = (unsigned)atoi(pt);
81                                                 if(n > 0)
82                                                         if(!FLAC__metadata_object_seektable_template_append_spaced_points(seektable_template, (unsigned)n, total_samples_to_encode))
83                                                                 return false;
84                                         }
85                                 }
86                         }
87                         else if(q[-1] == 's') { /* -S #s */
88                                 if(total_samples_to_encode > 0) { /* we can only do these if we know the number of samples to encode up front */
89                                         FLAC__ASSERT(sample_rate > 0);
90                                         if(0 != spec_has_real_points)
91                                                 *spec_has_real_points = true;
92                                         if(!only_explicit_placeholders) {
93                                                 const double sec = atof(pt);
94                                                 if(sec > 0.0) {
95                                                         unsigned samples = (unsigned)(sec * (double)sample_rate);
96                                                         if(samples > 0) {
97                                                                 /* +1 for the initial point at sample 0 */
98                                                                 if(!FLAC__metadata_object_seektable_template_append_spaced_points_by_samples(seektable_template, samples, total_samples_to_encode))
99                                                                         return false;
100                                                         }
101                                                 }
102                                         }
103                                 }
104                         }
105                         else { /* -S # */
106                                 if(0 != spec_has_real_points)
107                                         *spec_has_real_points = true;
108                                 if(!only_explicit_placeholders) {
109                                         char *endptr;
110 #ifdef _MSC_VER
111                                         const FLAC__int64 n = local__strtoll(pt, &endptr);
112 #else
113                                         const FLAC__int64 n = (FLAC__int64)strtoll(pt, &endptr, 10);
114 #endif
115                                         if(
116                                                 (n > 0 || (endptr > pt && *endptr == ';')) && /* is a valid number (extra check needed for "0") */
117                                                 (total_samples_to_encode == 0 || (FLAC__uint64)n < total_samples_to_encode) /* number is not >= the known total_samples_to_encode */
118                                         )
119                                                 if(!FLAC__metadata_object_seektable_template_append_point(seektable_template, (FLAC__uint64)n))
120                                                         return false;
121                                 }
122                         }
123                 }
124
125                 pt = ++q;
126         }
127
128         if(!FLAC__metadata_object_seektable_template_sort(seektable_template, /*compact=*/true))
129                 return false;
130
131         return true;
132 }