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