src/plugin_common/replaygain.c

   1 /* plugin_common - Routines common to several plugins
   2  * Copyright (C) 2002-2009  Josh Coalson
   3  * Copyright (C) 2011-2013  Xiph.Org Foundation
   4  * Copyright (C) 2003  Philip Jägenstedt
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version 2
   9  * of the License, or (at your option) any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License along
  17  * with this program; if not, write to the Free Software Foundation, Inc.,
  18  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  19  */
  20
  21 #if HAVE_CONFIG_H
  22 #  include <config.h>
  23 #endif
  24
  25 #include "replaygain.h"
  26 #include "FLAC/ordinals.h"
  27 #include "FLAC/metadata.h"
  28 #include "share/grabbag.h"
  29
  30 FLAC__bool FLAC_plugin__replaygain_get_from_file(const char *filename,
  31                                                  double *reference, FLAC__bool *reference_set,
  32                                                  double *track_gain, FLAC__bool *track_gain_set,
  33                                                  double *album_gain, FLAC__bool *album_gain_set,
  34                                                  double *track_peak, FLAC__bool *track_peak_set,
  35                                                  double *album_peak, FLAC__bool *album_peak_set)
  36 {
  37         FLAC__Metadata_SimpleIterator *iterator = FLAC__metadata_simple_iterator_new();
  38         FLAC__bool ret = false;
  39
  40         *track_gain_set = *album_gain_set = *track_peak_set = *album_peak_set = false;
  41
  42         if(0 != iterator) {
  43                 if(FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
  44                         FLAC__bool got_vorbis_comments = false;
  45                         ret = true;
  46                         do {
  47                                 if(FLAC__metadata_simple_iterator_get_block_type(iterator) == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
  48                                         FLAC__StreamMetadata *block = FLAC__metadata_simple_iterator_get_block(iterator);
  49                                         if(0 != block) {
  50                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/false, /*strict=*/true, reference, track_gain, track_peak)) {
  51                                                         *reference_set = *track_gain_set = *track_peak_set = true;
  52                                                 }
  53                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/true, /*strict=*/true, reference, album_gain, album_peak)) {
  54                                                         *reference_set = *album_gain_set = *album_peak_set = true;
  55                                                 }
  56                                                 FLAC__metadata_object_delete(block);
  57                                                 got_vorbis_comments = true;
  58                                         }
  59                                 }
  60                         } while (!got_vorbis_comments && FLAC__metadata_simple_iterator_next(iterator));
  61                 }
  62                 FLAC__metadata_simple_iterator_delete(iterator);
  63         }
  64         return ret;
  65 }