src/plugin_common/replaygain.c

   1 /* plugin_common - Routines common to several plugins
   2  * Copyright (C) 2002,2003,2004,2005,2006  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 #include "replaygain.h"
  21 #include "FLAC/ordinals.h"
  22 #include "FLAC/metadata.h"
  23 #include "share/grabbag.h"
  24
  25 void FLAC_plugin__replaygain_get_from_file(const char *filename,
  26                                            double *track_gain, FLAC__bool *track_gain_set,
  27                                            double *album_gain, FLAC__bool *album_gain_set,
  28                                            double *track_peak, FLAC__bool *track_peak_set,
  29                                            double *album_peak, FLAC__bool *album_peak_set)
  30 {
  31         *track_gain_set = *album_gain_set = *track_peak_set = *album_peak_set = false;
  32
  33         /* Largely stolen from vorbiscomment.c and the other replaygain.c  */
  34         FLAC__Metadata_SimpleIterator *iterator = FLAC__metadata_simple_iterator_new();
  35         if(0 != iterator) {
  36                 if(FLAC__metadata_simple_iterator_init(iterator, filename, /*read_only=*/true, /*preserve_file_stats=*/true)) {
  37                         FLAC__bool got_vorbis_comments = false;
  38                         do {
  39                                 if(FLAC__metadata_simple_iterator_get_block_type(iterator) == FLAC__METADATA_TYPE_VORBIS_COMMENT) {
  40                                         FLAC__StreamMetadata *block = FLAC__metadata_simple_iterator_get_block(iterator);
  41                                         if(0 != block) {
  42                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/false, /*strict=*/true, track_gain, track_peak)) {
  43                                                         *track_gain_set = *track_peak_set = true;
  44                                                 }
  45                                                 if(grabbag__replaygain_load_from_vorbiscomment(block, /*album_mode=*/true, /*strict=*/true, album_gain, album_peak)) {
  46                                                         *album_gain_set = *album_peak_set = true;
  47                                                 }
  48                                                 FLAC__metadata_object_delete(block);
  49                                                 got_vorbis_comments = true;
  50                                         }
  51                                 }
  52                         } while (!got_vorbis_comments && FLAC__metadata_simple_iterator_next(iterator));
  53                 }
  54                 FLAC__metadata_simple_iterator_delete(iterator);
  55         }
  56         return;
  57 }