ogg_afh.c

   1 /*
   2  * Copyright (C) 2004-2009 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 <inttypes.h>
  10 #include <ogg/ogg.h>
  11 #include <vorbis/codec.h>
  12
  13 #include "para.h"
  14 #include "afh.h"
  15 #include "error.h"
  16 #include "string.h"
  17
  18 /* Taken from decoder_example.c of libvorbis-1.2.3. */
  19 static int read_vorbis_comment(ogg_sync_state *oss, ogg_stream_state *stream,
  20                 vorbis_info *vi, vorbis_comment *vc)
  21 {
  22         ogg_page page;
  23         ogg_packet packet;
  24         int i = 0;
  25
  26         while (i < 2) {
  27                 while (i < 2) {
  28                         int ret = ogg_sync_pageout(oss, &page);
  29                         if (ret == 0)
  30                                 break; /* Need more data */
  31                         if (ret != 1)
  32                                 continue;
  33                         /*
  34                          * We can ignore any errors here as they'll also become
  35                          * apparent at packetout.
  36                          */
  37                         ogg_stream_pagein(stream, &page);
  38                         while (i < 2) {
  39                                 ret = ogg_stream_packetout(stream, &packet);
  40                                 if (ret == 0)
  41                                         break;
  42                                 if (ret < 0)
  43                                         return -E_STREAM_PACKETOUT;
  44                                 ret = vorbis_synthesis_headerin(vi, vc,
  45                                         &packet);
  46                                 if (ret < 0)
  47                                         return -E_VORBIS;
  48                                 i++;
  49                         }
  50                 }
  51         }
  52         return 1;
  53 }
  54
  55 static int read_vorbis_info(ogg_sync_state *oss, struct afh_info *afhi)
  56 {
  57         vorbis_comment vc;
  58         vorbis_info vi;
  59         ogg_packet packet;
  60         ogg_stream_state stream;
  61         ogg_page page;
  62         int ret;
  63         char *taginfo;
  64
  65         vorbis_info_init(&vi);
  66         vorbis_comment_init(&vc);
  67
  68         ret = -E_SYNC_PAGEOUT;
  69         if (ogg_sync_pageout(oss, &page) != 1)
  70                 goto out;
  71
  72         ret = ogg_page_serialno(&page);
  73         ogg_stream_init(&stream, ret);
  74
  75         ret = -E_STREAM_PAGEIN;
  76         if (ogg_stream_pagein(&stream, &page) < 0)
  77                 goto out;
  78
  79         ret = -E_STREAM_PACKETOUT;
  80         if (ogg_stream_packetout(&stream, &packet) != 1)
  81                 goto out;
  82
  83         ret = -E_VORBIS;
  84         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
  85                 goto out;
  86         if (vi.rate == 0)
  87                 goto out;
  88         afhi->channels = vi.channels;
  89         afhi->frequency = vi.rate;
  90         afhi->bitrate = vi.bitrate_nominal / 1000;
  91         PARA_DEBUG_LOG("channels: %i, sampling rate: %i, bitrate: %i\n",
  92                 afhi->channels, afhi->frequency, afhi->bitrate);
  93         ret = read_vorbis_comment(oss, &stream, &vi, &vc);
  94         if (ret < 0)
  95                 goto out;
  96         taginfo = make_taginfo(
  97                 vorbis_comment_query(&vc, "title", 0),
  98                 vorbis_comment_query(&vc, "artist", 0),
  99                 vorbis_comment_query(&vc, "album", 0),
 100                 vorbis_comment_query(&vc, "year", 0),
 101                 vorbis_comment_query(&vc, "comment", 0)
 102         );
 103         PARA_DEBUG_LOG("tag info: %s\n", taginfo);
 104         afhi->info_string = make_message("%s:\n%s",
 105                 status_item_list[SI_AUDIO_FILE_INFO], taginfo);
 106         free(taginfo);
 107
 108         afhi->header_offset = 0;
 109         afhi->header_len = oss->returned;
 110         ret = 1;
 111 out:
 112         vorbis_info_clear(&vi);
 113         vorbis_comment_clear(&vc);
 114         ogg_stream_clear(&stream);
 115         return ret;
 116 }
 117
 118 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
 119                 struct timeval *result)
 120 {
 121         uint64_t x = (uint64_t)num_frames * 1000 * 1000
 122                 / frequency / num_chunks;
 123
 124         result->tv_sec = x / 1000 / 1000;
 125         result->tv_usec = x % (1000 * 1000);
 126         PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
 127                 tv2ms(result));
 128 }
 129
 130 /* Write tech data to given audio format handler struct. */
 131 static int ogg_get_file_info(char *map, size_t numbytes, __a_unused int fd,
 132                 struct afh_info *afhi)
 133 {
 134         ogg_sync_state oss;
 135         ogg_page op;
 136         long len = numbytes;
 137         char *buf;
 138         int ret, i, j, frames_per_chunk, ct_size;
 139         long long unsigned num_frames = 0;
 140
 141         afhi->info_string = NULL;
 142         ogg_sync_init(&oss);
 143         ret = -E_OGG_SYNC;
 144         buf = ogg_sync_buffer(&oss, len);
 145         if (!buf)
 146                 goto out;
 147         memcpy(buf, map, len);
 148         ret = -E_OGG_SYNC;
 149         if (ogg_sync_wrote(&oss, len) < 0)
 150                 goto out;
 151         ret = read_vorbis_info(&oss, afhi);
 152         if (ret < 0)
 153                 goto out;
 154         oss.returned = 0;
 155         oss.fill = numbytes;
 156         /* count ogg packages and get duration of the file */
 157         for (i = 0; ogg_sync_pageseek(&oss, &op) > 0; i++)
 158                 num_frames = ogg_page_granulepos(&op);
 159         PARA_INFO_LOG("%d pages, %llu frames\n", i, num_frames);
 160         ret = -E_OGG_EMPTY;
 161         if (i == 0)
 162                 goto out;
 163         afhi->seconds_total = num_frames / afhi->frequency;
 164         /* use roughly one page per chunk */
 165         frames_per_chunk = num_frames / i;
 166         PARA_INFO_LOG("%lu seconds, %d frames/chunk\n",
 167                 afhi->seconds_total, frames_per_chunk);
 168         ct_size = 250;
 169         afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
 170         afhi->chunk_table[0] = 0;
 171         afhi->chunk_table[1] = afhi->header_len;
 172         oss.returned = afhi->header_len;
 173         oss.fill = numbytes;
 174         for (i = 0, j = 1; ogg_sync_pageseek(&oss, &op) > 0; i++) {
 175                 int granule = ogg_page_granulepos(&op);
 176
 177                 while (granule > j * frames_per_chunk) {
 178                         j++;
 179                         if (j >= ct_size) {
 180                                 ct_size *= 2;
 181                                 afhi->chunk_table = para_realloc(
 182                                         afhi->chunk_table,
 183                                         ct_size * sizeof(uint32_t));
 184                         }
 185                         afhi->chunk_table[j] = oss.returned;
 186                 }
 187         }
 188         afhi->chunks_total = j;
 189         set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
 190         tv_scale(3, &afhi->chunk_tv, &afhi->eof_tv);
 191         ret = 0;
 192 out:
 193         ogg_sync_clear(&oss);
 194         return ret;
 195 }
 196
 197 static const char* ogg_suffixes[] = {"ogg", NULL};
 198
 199 /**
 200  * The init function of the ogg vorbis audio format handler.
 201  *
 202  * \param afh Pointer to the struct to initialize.
 203  */
 204 void ogg_init(struct audio_format_handler *afh)
 205 {
 206         afh->get_file_info = ogg_get_file_info,
 207         afh->suffixes = ogg_suffixes;
 208 }