ogg_afh_common.c

   1 /*
   2  * Copyright (C) 2004-2011 Andre Noll <maan@systemlinux.org>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file ogg_afh_common.c Functions common to ogg/vorbis and ogg/speex. */
   8
   9 #include <ogg/ogg.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
  19 /* Taken from decoder_example.c of libvorbis-1.2.3. */
  20 static int process_packets_2_and_3(ogg_sync_state *oss,
  21                 ogg_stream_state *stream, struct afh_info *afhi,
  22                 struct ogg_afh_callback_info *ci)
  23 {
  24         ogg_page page;
  25         ogg_packet packet;
  26         int i = 0;
  27
  28         while (i < 2) {
  29                 while (i < 2) {
  30                         int ret = ogg_sync_pageout(oss, &page);
  31                         if (ret == 0)
  32                                 break; /* Need more data */
  33                         if (ret != 1)
  34                                 continue;
  35                         PARA_DEBUG_LOG("next input page (header/body): %lu/%lu\n",
  36                                 page.header_len, page.body_len);
  37                         /*
  38                          * We can ignore any errors here as they'll also become
  39                          * apparent at packetout.
  40                          */
  41                         ogg_stream_pagein(stream, &page);
  42                         PARA_DEBUG_LOG("ogg page serial: %d\n",
  43                                 ogg_page_serialno(&page));
  44                         while (i < 2) {
  45                                 ret = ogg_stream_packetout(stream, &packet);
  46                                 PARA_DEBUG_LOG("packet #%d: %lu bytes\n", i + 1,
  47                                         packet.bytes);
  48                                 if (ret == 0)
  49                                         break;
  50                                 if (ret < 0)
  51                                         return -E_STREAM_PACKETOUT;
  52                                 ret = ci->packet_callback(&packet, i + 1,
  53                                         ogg_page_serialno(&page), afhi,
  54                                         ci->private_data);
  55                                 if (ret < 0)
  56                                         return ret;
  57                                 if (ret == 0) /* header complete */
  58                                         return 1;
  59                                 i++;
  60                         }
  61                 }
  62         }
  63         return 1;
  64 }
  65
  66 static int process_ogg_packets(ogg_sync_state *oss, struct afh_info *afhi,
  67                 struct ogg_afh_callback_info *ci)
  68 {
  69         ogg_packet packet;
  70         ogg_stream_state stream;
  71         ogg_page page;
  72         int ret;
  73
  74         if (ogg_sync_pageout(oss, &page) != 1)
  75                 return -E_SYNC_PAGEOUT;
  76         PARA_DEBUG_LOG("first input page (header/body): %lu/%lu\n",
  77                 page.header_len, page.body_len);
  78
  79         ret = ogg_page_serialno(&page);
  80         ogg_stream_init(&stream, ret);
  81
  82         ret = -E_STREAM_PAGEIN;
  83         if (ogg_stream_pagein(&stream, &page) < 0)
  84                 goto out;
  85
  86         ret = -E_STREAM_PACKETOUT;
  87         if (ogg_stream_packetout(&stream, &packet) != 1)
  88                 goto out;
  89         PARA_DEBUG_LOG("packet #0: %lu bytes\n", packet.bytes);
  90         ret = ci->packet_callback(&packet, 0, ogg_page_serialno(&page),
  91                 afhi, ci->private_data);
  92         if (ret < 0)
  93                 goto out;
  94         ret = process_packets_2_and_3(oss, &stream, afhi, ci);
  95         if (ret < 0)
  96                 goto out;
  97         ret = 1;
  98 out:
  99         ogg_stream_clear(&stream);
 100         return ret;
 101 }
 102
 103 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
 104                 struct timeval *result)
 105 {
 106         uint64_t x = (uint64_t)num_frames * 1000 * 1000
 107                 / frequency / num_chunks;
 108
 109         result->tv_sec = x / 1000 / 1000;
 110         result->tv_usec = x % (1000 * 1000);
 111         PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
 112                 tv2ms(result));
 113 }
 114
 115 /**
 116  * Pass first three ogg packets to callback and build the chunk table.
 117  *
 118  * This function extracts the first three ogg packets of the audio data
 119  * given by \a map and \a numbytes and passes each packet to the callback
 120  * defined by \a ci.
 121  *
 122  * If the packet callback indicates success and \a afhi is not \p NULL, the
 123  * chunk table is built. Chunk zero contains the first three ogg packets while
 124  * all other chunks consist of exactly one ogg page.
 125  *
 126  * \param map Audio file data.
 127  * \param numbytes The length of \a map.
 128  * \param afhi Passed to the packet callback, contains chunk table.
 129  * \param ci The callback structure.
 130  *
 131  * \return Standard.
 132  */
 133 int ogg_get_file_info(char *map, size_t numbytes, struct afh_info *afhi,
 134                 struct ogg_afh_callback_info *ci)
 135 {
 136         ogg_sync_state oss;
 137         ogg_page op;
 138         long len = numbytes;
 139         char *buf;
 140         int ret, i, j, frames_per_chunk, ct_size;
 141         long long unsigned num_frames = 0;
 142
 143         ogg_sync_init(&oss);
 144         ret = -E_OGG_SYNC;
 145         buf = ogg_sync_buffer(&oss, len);
 146         if (!buf)
 147                 goto out;
 148         memcpy(buf, map, len);
 149         ret = -E_OGG_SYNC;
 150         if (ogg_sync_wrote(&oss, len) < 0)
 151                 goto out;
 152         ret = process_ogg_packets(&oss, afhi, ci);
 153         if (ret < 0)
 154                 goto out;
 155         if (!afhi)
 156                 goto out;
 157         afhi->header_len = oss.returned;
 158         oss.returned = 0;
 159         oss.fill = numbytes;
 160         /* count ogg packages and get duration of the file */
 161         for (i = 0; ogg_sync_pageseek(&oss, &op) > 0; i++)
 162                 num_frames = ogg_page_granulepos(&op);
 163         PARA_INFO_LOG("%d pages, %llu frames\n", i, num_frames);
 164         ret = -E_OGG_EMPTY;
 165         if (i == 0)
 166                 goto out;
 167         afhi->seconds_total = num_frames / afhi->frequency;
 168         /* use roughly one page per chunk */
 169         frames_per_chunk = num_frames / i;
 170         PARA_INFO_LOG("%lu seconds, %d frames/chunk\n",
 171                 afhi->seconds_total, frames_per_chunk);
 172         ct_size = 250;
 173         afhi->chunk_table = para_malloc(ct_size * sizeof(uint32_t));
 174         afhi->chunk_table[0] = 0;
 175         afhi->chunk_table[1] = afhi->header_len;
 176         oss.returned = afhi->header_len;
 177         oss.fill = numbytes;
 178         for (j = 1; ogg_sync_pageseek(&oss, &op) > 0; /* nothing */) {
 179                 int granule = ogg_page_granulepos(&op);
 180
 181                 while (granule > j * frames_per_chunk) {
 182                         j++;
 183                         if (j >= ct_size) {
 184                                 ct_size *= 2;
 185                                 afhi->chunk_table = para_realloc(
 186                                         afhi->chunk_table,
 187                                         ct_size * sizeof(uint32_t));
 188                         }
 189                         afhi->chunk_table[j] = oss.returned;
 190                 }
 191         }
 192         afhi->chunks_total = j;
 193         set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
 194         ret = 0;
 195 out:
 196         ogg_sync_clear(&oss);
 197         return ret;
 198 }