2 * Copyright (C) 2004-2010 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
7 /** \file ogg_afh_common.c Functions common to ogg/vorbis and ogg/speex. */
16 #include "ogg_afh_common.h"
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)
30 int ret = ogg_sync_pageout(oss, &page);
32 break; /* Need more data */
36 * We can ignore any errors here as they'll also become
37 * apparent at packetout.
39 ogg_stream_pagein(stream, &page);
41 ret = ogg_stream_packetout(stream, &packet);
45 return -E_STREAM_PACKETOUT;
46 ret = ci->packet_callback(&packet, i + 1, afhi,
50 if (ret == 0) /* header complete */
59 static int process_ogg_packets(ogg_sync_state *oss, struct afh_info *afhi,
60 struct ogg_afh_callback_info *ci)
63 ogg_stream_state stream;
67 ret = -E_SYNC_PAGEOUT;
68 if (ogg_sync_pageout(oss, &page) != 1)
71 ret = ogg_page_serialno(&page);
72 ogg_stream_init(&stream, ret);
74 ret = -E_STREAM_PAGEIN;
75 if (ogg_stream_pagein(&stream, &page) < 0)
78 ret = -E_STREAM_PACKETOUT;
79 if (ogg_stream_packetout(&stream, &packet) != 1)
81 ret = ci->packet_callback(&packet, 0, afhi, ci->private_data);
84 ret = process_packets_2_and_3(oss, &stream, afhi, ci);
87 afhi->header_offset = 0;
88 afhi->header_len = oss->returned;
91 ogg_stream_clear(&stream);
95 static void set_chunk_tv(int num_frames, int num_chunks, int frequency,
96 struct timeval *result)
98 uint64_t x = (uint64_t)num_frames * 1000 * 1000
99 / frequency / num_chunks;
101 result->tv_sec = x / 1000 / 1000;
102 result->tv_usec = x % (1000 * 1000);
103 PARA_INFO_LOG("%d chunks, chunk time: %lums\n", num_chunks,
108 * Pass first three ogg packets to callback and build the chunk table.
110 * This function extracts the first three ogg packets of the audio data
111 * given by \a map and \a numbytes and passes each packet to the callback
114 * If the packet callback indicates success, the chunk table is built. Chunk
115 * zero contains the first three ogg packets while all other chunks consist of
116 * exactly one ogg page.
118 * \param map Audio file data.
119 * \param numbytes The length of \a map.
120 * \param afhi Passed to the packet callback, contains chunk table.
121 * \param ci The callback structure.
125 int ogg_get_file_info(char *map, size_t numbytes, struct afh_info *afhi,
126 struct ogg_afh_callback_info *ci)
132 int ret, i, j, frames_per_chunk, ct_size;
133 long long unsigned num_frames = 0;
137 buf = ogg_sync_buffer(&oss, len);
140 memcpy(buf, map, len);
142 if (ogg_sync_wrote(&oss, len) < 0)
144 ret = process_ogg_packets(&oss, afhi, ci);
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);
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);
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;
167 for (i = 0, j = 1; ogg_sync_pageseek(&oss, &op) > 0; i++) {
168 int granule = ogg_page_granulepos(&op);
170 while (granule > j * frames_per_chunk) {
174 afhi->chunk_table = para_realloc(
176 ct_size * sizeof(uint32_t));
178 afhi->chunk_table[j] = oss.returned;
181 afhi->chunks_total = j;
182 set_chunk_tv(num_frames, j, afhi->frequency, &afhi->chunk_tv);
185 ogg_sync_clear(&oss);