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 struct ogg_datasource {
39 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
41 struct ogg_datasource *ods = datasource;
42 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
46 memcpy(buf, ods->map + ods->fpos, copy);
47 // PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
48 ods->fpos += ret * size;
52 static int cb_seek(void *datasource, ogg_int64_t offset,
55 struct ogg_datasource *ods = datasource;
58 if (offset >= 0 && offset <= ods->numbytes) {
66 if (offset <= 0 && -offset <= ods->numbytes) {
67 ods->fpos = ods->numbytes + offset;
74 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
75 (offset < 0 && offset + ods->fpos < 0)) {
86 /* don't do anything as vss still needs the open filehandle */
87 static int cb_close(__a_unused void *datasource)
92 static long cb_tell(void *datasource)
94 struct ogg_datasource *ods = datasource;
95 return (unsigned long)ods->fpos;
98 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
100 int ret = ov_open_callbacks(datasource, vf,
101 NULL, /* no initial buffer */
102 0, /* no initial bytes */
103 c); /* the ov_open_callbacks */
105 /* FIXME: provide better error codes */
108 if (ret == OV_ENOTVORBIS)
110 if (ret == OV_EVERSION)
112 if (ret == OV_EBADHEADER)
120 static int ogg_compute_header_len(char *map, size_t numbytes,
121 struct audio_format_info *afi)
124 size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
132 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
133 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
134 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
136 ogg_sync_init(sync_in);
137 vorbis_info_init(&vi);
138 vorbis_comment_init(&vc);
139 buf = ogg_sync_buffer(sync_in, (long)len);
140 memcpy(buf, map, len);
141 ogg_sync_wrote(sync_in, (long)len);
142 ret = -E_SYNC_PAGEOUT;
143 if (ogg_sync_pageout(sync_in, &page) <= 0)
145 serial = ogg_page_serialno(&page);
146 ogg_stream_init(stream_in, serial);
147 ogg_stream_init(stream_out, serial);
148 ret = ogg_stream_pagein(stream_in, &page);
150 ret = E_STREAM_PAGEIN;
153 ret = ogg_stream_packetout(stream_in, &packet);
155 ret = -E_STREAM_PACKETOUT;
159 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
161 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
162 ogg_stream_packetin(stream_out, &packet);
164 ret = ogg_sync_pageout(sync_in, &page);
166 ret = -E_SYNC_PAGEOUT;
169 ogg_stream_pagein(stream_in, &page);
170 ogg_stream_packetout(stream_in, &packet);
171 ogg_stream_packetin(stream_out, &packet);
173 ret = ogg_sync_pageout(sync_in, &page);
175 ret = -E_SYNC_PAGEOUT;
178 ogg_stream_pagein(stream_in, &page);
179 ogg_stream_packetout(stream_in, &packet);
180 ogg_stream_packetin(stream_out, &packet);
183 while (ogg_stream_flush(stream_out, &page))
184 afi->header_len += page.body_len + page.header_len;
185 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
186 afi->header_offset = 0;
189 ogg_stream_destroy(stream_in);
190 ogg_stream_destroy(stream_out);
192 ogg_sync_destroy(sync_in);
193 vorbis_info_clear(&vi);
194 vorbis_comment_clear(&vc);
199 * Alloc and fill array table of byte offsets. chunk_table[i] is the
200 * offset in the current input file at which the sample containing time i *
201 * CHUNK_TIME begins. Always successful.
203 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
204 struct audio_format_info *afi, long unsigned time_total)
207 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
208 long unsigned num_chunks;
212 num = time_total / chunk_time + 3;
213 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
215 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
216 afi->chunk_table[0] = 0;
218 for (i = 1; ret <= num; i++) {
220 ret = ov_time_seek(of, i * chunk_time);
223 pos = ov_raw_tell(of);
224 diff = pos - old_pos;
225 max_chunk_len = PARA_MAX(max_chunk_len, diff);
226 min = (i == 1)? diff : PARA_MIN(min, diff);
227 afi->chunk_table[i] = pos;
228 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
229 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
230 // "size: %zd\n", i - 1,
231 // i * chunk_time, pos, pos - old_pos);
235 //fi->chunk_table[i] = pos;
236 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
237 num_chunks, chunk_time, max_chunk_len, min);
242 * Init oggvorbis file and write some tech data to given pointers.
244 static int ogg_get_file_info(char *map, size_t numbytes,
245 struct audio_format_info *afi)
250 const ov_callbacks ovc = {
251 .read_func = cb_read,
252 .seek_func = cb_seek,
253 .close_func = cb_close,
256 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
258 ret = ogg_compute_header_len(map, numbytes, afi);
261 ret = ogg_open_callbacks(&ods, &of, ovc);
265 vi = ov_info(&of, 0);
268 afi->seconds_total = ov_time_total(&of, -1);
269 afi->frequency = vi->rate;
270 afi->bitrate = ov_bitrate(&of, 0);
271 afi->channels = vi->channels;
272 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
273 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
274 "%d channels, %ukbps\n"
275 "audio_file_info2: \n"
276 "audio_file_info3: \n",
277 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
278 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
280 afi->chunk_tv.tv_sec = 0;
281 afi->chunk_tv.tv_usec = 250 * 1000;
282 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
285 ov_clear(&of); /* keeps the file open */
289 static const char* ogg_suffixes[] = {"ogg", NULL};
292 * the init function of the ogg vorbis audio format handler
294 * \param afh pointer to the struct to initialize
296 void ogg_init(struct audio_format_handler *afh)
298 afh->get_file_info = ogg_get_file_info,
299 afh->suffixes = ogg_suffixes;