src/lib/dl/ext/flac/seektable.c

   1 /* grabbag - Convenience lib for various routines common to several tools
   2  * Copyright (C) 2002,2003,2004,2005,2006,2007  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 }