src/plugin_common/replaygain.c

   1 /* plugin_common - Routines common to several plugins
   2  * Copyright (C) 2002,2003,2004,2005,2006,2007  Josh Coalson
   3  * Copyright (C) 2003  Philip Jägenstedt
   4  *
   5  * This program is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU General Public License
   7  * as published by the Free Software Foundation; either version 2
   8  * of the License, or (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program; if not, write to the Free Software
  17  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  18  */
  19
  20 #if HAVE_CONFIG_H
  21 #  include <config.h>
  22 #endif
  23
  24 #include "replaygain.h"
  25 #include "FLAC/ordinals.h"
  26 #include "FLAC/metadata.h"
  27 #include "share/grabbag.h"
  28
  29 FLAC__bool FLAC_plugin__replaygain_get_from_file(const char *filename,
  30                                                  double *reference, FLAC__bool *reference_set,
  31                                                  double *track_gain, FLAC__bool *track_gain_set,
  32                                                  double *album_gain, FLAC__bool *album_gain_set,
  33                                                  double *track_peak, FLAC__bool *track_peak_set,
  34                                                  double *album_peak, FLAC__bool *album_peak_set)
  35 {
  36         FLAC__Metadata_SimpleIterator *iterator = FLAC__metadata_simple_iterator_new();
  37         FLAC__bool ret = false;
  38
  39         *track_gain_set = *album_gain_set = *track_peak_set = *album_peak_set = false;
  40
  41         if(0 != iterator) {
  42                 if(FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
  43                         ret = true;
  44                         FLAC__bool got_vorbis_comments = false;
  45                         do {
  46                                 if(FLAC__metadata_simple_iterator_get_block_type(iterator) == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
  47                                         FLAC__StreamMetadata *block = FLAC__metadata_simple_iterator_get_block(iterator);
  48                                         if(0 != block) {
  49                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/false, /*strict=*/true, reference, track_gain, track_peak)) {
  50                                                         *reference_set = *track_gain_set = *track_peak_set = true;
  51                                                 }
  52                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/true, /*strict=*/true, reference, album_gain, album_peak)) {
  53                                                         *reference_set = *album_gain_set = *album_peak_set = true;
  54                                                 }
  55                                                 FLAC__metadata_object_delete(block);
  56                                                 got_vorbis_comments = true;
  57                                         }
  58                                 }
  59                         } while (!got_vorbis_comments && FLAC__metadata_simple_iterator_next(iterator));
  60                 }
  61                 FLAC__metadata_simple_iterator_delete(iterator);
  62         }
  63         return ret;
  64 }