ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2010 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file ogg_afh.c Audio format handler for ogg/vorbis files. */
   8
   9 #include <vorbis/codec.h>
  10 #include <regex.h>
  11
  12 #include "para.h"
  13 #include "afh.h"
  14 #include "error.h"
  15 #include "string.h"
  16 #include "ogg_afh_common.h"
  17
  18 struct private_vorbis_data {
  19         vorbis_info vi;
  20         vorbis_comment vc;
  21 };
  22
  23 static int vorbis_packet_callback(ogg_packet *packet, int packet_num,
  24                 struct afh_info *afhi, void *private_data)
  25 {
  26         struct private_vorbis_data *pvd = private_data;
  27
  28         if (vorbis_synthesis_headerin(&pvd->vi, &pvd->vc, packet) < 0)
  29                 return -E_VORBIS;
  30         if (packet_num == 0) {
  31                 if (pvd->vi.rate == 0)
  32                         return -E_VORBIS;
  33                 afhi->channels = pvd->vi.channels;
  34                 afhi->frequency = pvd->vi.rate;
  35                 afhi->bitrate = pvd->vi.bitrate_nominal / 1000;
  36                 PARA_DEBUG_LOG("channels: %i, sampling rate: %i, bitrate: %i\n",
  37                         afhi->channels, afhi->frequency, afhi->bitrate);
  38                 return 1;
  39         }
  40         if (packet_num == 1)
  41                 return 1; /* we also want to have packet #2 */
  42         afhi->tags.artist = para_strdup(vorbis_comment_query(&pvd->vc, "artist", 0));
  43         afhi->tags.title = para_strdup(vorbis_comment_query(&pvd->vc, "title", 0));
  44         afhi->tags.album = para_strdup(vorbis_comment_query(&pvd->vc, "album", 0));
  45         afhi->tags.year = para_strdup(vorbis_comment_query(&pvd->vc, "year", 0));
  46         afhi->tags.comment = para_strdup(vorbis_comment_query(&pvd->vc, "comment", 0));
  47         return 0;
  48 }
  49
  50 static int ogg_vorbis_get_file_info(char *map, size_t numbytes, __a_unused int fd,
  51                 struct afh_info *afhi)
  52 {
  53         int ret;
  54         struct private_vorbis_data pvd;
  55         struct ogg_afh_callback_info vorbis_callback_info = {
  56                 .packet_callback = vorbis_packet_callback,
  57                 .private_data = &pvd,
  58         };
  59
  60         vorbis_info_init(&pvd.vi);
  61         vorbis_comment_init(&pvd.vc);
  62         ret = ogg_get_file_info(map, numbytes, afhi, &vorbis_callback_info);
  63         vorbis_info_clear(&pvd.vi);
  64         vorbis_comment_clear(&pvd.vc);
  65         return ret;
  66 }
  67
  68 static const char* ogg_suffixes[] = {"ogg", NULL};
  69
  70 /**
  71  * The init function of the ogg vorbis audio format handler.
  72  *
  73  * \param afh Pointer to the struct to initialize.
  74  */
  75 void ogg_init(struct audio_format_handler *afh)
  76 {
  77         afh->get_file_info = ogg_vorbis_get_file_info,
  78         afh->suffixes = ogg_suffixes;
  79 }