2 * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
4 * This program is free software; you can redistribute it and/or modify
5 * it under the terms of the GNU General Public License as published by
6 * the Free Software Foundation; either version 2 of the License, or
7 * (at your option) any later version.
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111, USA.
18 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
22 #include <vorbis/codec.h>
23 #include <vorbis/vorbisfile.h>
29 /** must be big enough to hold header */
30 #define CHUNK_SIZE 32768
31 static double chunk_time = 0.25;
33 /** describes a memory-mapped ogg vorbis file */
34 struct ogg_datasource {
35 /** the memory mapping */
37 /** this size of the mapping */
39 /** the current position in the mapping */
43 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
45 struct ogg_datasource *ods = datasource;
46 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
50 memcpy(buf, ods->map + ods->fpos, copy);
51 // PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
52 ods->fpos += ret * size;
56 static int cb_seek(void *datasource, ogg_int64_t offset,
59 struct ogg_datasource *ods = datasource;
62 if (offset >= 0 && offset <= ods->numbytes) {
70 if (offset <= 0 && -offset <= ods->numbytes) {
71 ods->fpos = ods->numbytes + offset;
78 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
79 (offset < 0 && offset + ods->fpos < 0)) {
90 /* don't do anything as vss still needs the open filehandle */
91 static int cb_close(__a_unused void *datasource)
96 static long cb_tell(void *datasource)
98 struct ogg_datasource *ods = datasource;
99 return (unsigned long)ods->fpos;
102 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
104 int ret = ov_open_callbacks(datasource, vf,
105 NULL, /* no initial buffer */
106 0, /* no initial bytes */
107 c); /* the ov_open_callbacks */
111 if (ret == OV_ENOTVORBIS)
113 if (ret == OV_EVERSION)
114 return -E_OGG_VERSION;
115 if (ret == OV_EBADHEADER)
116 return -E_OGG_BAD_HEADER;
118 return -E_OGG_UNKNOWN_ERROR;
123 static int ogg_compute_header_len(char *map, size_t numbytes,
124 struct audio_format_info *afi)
127 size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
135 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
136 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
137 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
139 ogg_sync_init(sync_in);
140 vorbis_info_init(&vi);
141 vorbis_comment_init(&vc);
142 buf = ogg_sync_buffer(sync_in, (long)len);
143 memcpy(buf, map, len);
144 ogg_sync_wrote(sync_in, (long)len);
145 ret = -E_SYNC_PAGEOUT;
146 if (ogg_sync_pageout(sync_in, &page) <= 0)
148 serial = ogg_page_serialno(&page);
149 ogg_stream_init(stream_in, serial);
150 ogg_stream_init(stream_out, serial);
151 ret = ogg_stream_pagein(stream_in, &page);
153 ret = -E_STREAM_PAGEIN;
156 ret = ogg_stream_packetout(stream_in, &packet);
158 ret = -E_STREAM_PACKETOUT;
162 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
164 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
165 ogg_stream_packetin(stream_out, &packet);
167 ret = ogg_sync_pageout(sync_in, &page);
169 ret = -E_SYNC_PAGEOUT;
172 ogg_stream_pagein(stream_in, &page);
173 ogg_stream_packetout(stream_in, &packet);
174 ogg_stream_packetin(stream_out, &packet);
176 ret = ogg_sync_pageout(sync_in, &page);
178 ret = -E_SYNC_PAGEOUT;
181 ogg_stream_pagein(stream_in, &page);
182 ogg_stream_packetout(stream_in, &packet);
183 ogg_stream_packetin(stream_out, &packet);
186 while (ogg_stream_flush(stream_out, &page))
187 afi->header_len += page.body_len + page.header_len;
188 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
189 afi->header_offset = 0;
192 ogg_stream_destroy(stream_in);
193 ogg_stream_destroy(stream_out);
195 ogg_sync_destroy(sync_in);
196 vorbis_info_clear(&vi);
197 vorbis_comment_clear(&vc);
202 * Alloc and fill array table of byte offsets. chunk_table[i] is the
203 * offset in the current input file at which the sample containing time i *
204 * CHUNK_TIME begins. Always successful.
206 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
207 struct audio_format_info *afi, long unsigned time_total)
210 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
211 long unsigned num_chunks;
215 num = time_total / chunk_time + 3;
216 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
218 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
219 afi->chunk_table[0] = 0;
221 for (i = 1; ret <= num; i++) {
223 ret = ov_time_seek(of, i * chunk_time);
226 pos = ov_raw_tell(of);
227 diff = pos - old_pos;
228 max_chunk_len = PARA_MAX(max_chunk_len, diff);
229 min = (i == 1)? diff : PARA_MIN(min, diff);
230 afi->chunk_table[i] = pos;
231 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
232 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
233 // "size: %zd\n", i - 1,
234 // i * chunk_time, pos, pos - old_pos);
238 //fi->chunk_table[i] = pos;
239 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
240 num_chunks, chunk_time, max_chunk_len, min);
245 * Init oggvorbis file and write some tech data to given pointers.
247 static int ogg_get_file_info(char *map, size_t numbytes,
248 struct audio_format_info *afi)
253 const ov_callbacks ovc = {
254 .read_func = cb_read,
255 .seek_func = cb_seek,
256 .close_func = cb_close,
259 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
261 ret = ogg_compute_header_len(map, numbytes, afi);
264 ret = ogg_open_callbacks(&ods, &of, ovc);
268 vi = ov_info(&of, 0);
271 afi->seconds_total = ov_time_total(&of, -1);
272 afi->frequency = vi->rate;
273 afi->bitrate = ov_bitrate(&of, 0);
274 afi->channels = vi->channels;
275 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
276 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
277 "%d channels, %ukbps\n"
278 "audio_file_info2: \n"
279 "audio_file_info3: \n",
280 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
281 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
283 afi->chunk_tv.tv_sec = 0;
284 afi->chunk_tv.tv_usec = 250 * 1000;
285 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
288 ov_clear(&of); /* keeps the file open */
292 static const char* ogg_suffixes[] = {"ogg", NULL};
295 * the init function of the ogg vorbis audio format handler
297 * \param afh pointer to the struct to initialize
299 void ogg_init(struct audio_format_handler *afh)
301 afh->get_file_info = ogg_get_file_info,
302 afh->suffixes = ogg_suffixes;