2 * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
4 * Licensed under the GPL v2. For licencing details see COPYING.
6 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
10 #include <vorbis/codec.h>
11 #include <vorbis/vorbisfile.h>
17 /** must be big enough to hold header */
18 #define CHUNK_SIZE 32768
19 static double chunk_time = 0.25;
21 /** describes a memory-mapped ogg vorbis file */
22 struct ogg_datasource {
23 /** the memory mapping */
25 /** this size of the mapping */
27 /** the current position in the mapping */
31 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
33 struct ogg_datasource *ods = datasource;
34 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
38 memcpy(buf, ods->map + ods->fpos, copy);
39 // PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
40 ods->fpos += ret * size;
44 static int cb_seek(void *datasource, ogg_int64_t offset,
47 struct ogg_datasource *ods = datasource;
50 if (offset >= 0 && offset <= ods->numbytes) {
58 if (offset <= 0 && -offset <= ods->numbytes) {
59 ods->fpos = ods->numbytes + offset;
66 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
67 (offset < 0 && offset + ods->fpos < 0)) {
78 /* don't do anything as vss still needs the open filehandle */
79 static int cb_close(__a_unused void *datasource)
84 static long cb_tell(void *datasource)
86 struct ogg_datasource *ods = datasource;
87 return (unsigned long)ods->fpos;
90 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
92 int ret = ov_open_callbacks(datasource, vf,
93 NULL, /* no initial buffer */
94 0, /* no initial bytes */
95 c); /* the ov_open_callbacks */
99 if (ret == OV_ENOTVORBIS)
101 if (ret == OV_EVERSION)
102 return -E_OGG_VERSION;
103 if (ret == OV_EBADHEADER)
104 return -E_OGG_BAD_HEADER;
106 return -E_OGG_UNKNOWN_ERROR;
111 static int ogg_compute_header_len(char *map, size_t numbytes,
112 struct audio_format_info *afi)
115 size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
123 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
124 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
125 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
127 ogg_sync_init(sync_in);
128 vorbis_info_init(&vi);
129 vorbis_comment_init(&vc);
130 buf = ogg_sync_buffer(sync_in, (long)len);
131 memcpy(buf, map, len);
132 ogg_sync_wrote(sync_in, (long)len);
133 ret = -E_SYNC_PAGEOUT;
134 if (ogg_sync_pageout(sync_in, &page) <= 0) {
139 serial = ogg_page_serialno(&page);
140 ogg_stream_init(stream_in, serial);
141 ogg_stream_init(stream_out, serial);
142 ret = ogg_stream_pagein(stream_in, &page);
144 ret = -E_STREAM_PAGEIN;
147 ret = ogg_stream_packetout(stream_in, &packet);
149 ret = -E_STREAM_PACKETOUT;
153 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
155 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
156 ogg_stream_packetin(stream_out, &packet);
158 ret = ogg_sync_pageout(sync_in, &page);
160 ret = -E_SYNC_PAGEOUT;
163 ogg_stream_pagein(stream_in, &page);
164 ogg_stream_packetout(stream_in, &packet);
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);
177 while (ogg_stream_flush(stream_out, &page))
178 afi->header_len += page.body_len + page.header_len;
179 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
180 afi->header_offset = 0;
183 ogg_stream_destroy(stream_in);
184 ogg_stream_destroy(stream_out);
186 ogg_sync_destroy(sync_in);
187 vorbis_info_clear(&vi);
188 vorbis_comment_clear(&vc);
193 * Alloc and fill array table of byte offsets. chunk_table[i] is the
194 * offset in the current input file at which the sample containing time i *
195 * CHUNK_TIME begins. Always successful.
197 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
198 struct audio_format_info *afi, long unsigned time_total)
201 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
202 long unsigned num_chunks;
206 num = time_total / chunk_time + 3;
207 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
209 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
210 afi->chunk_table[0] = 0;
212 for (i = 1; ret <= num; i++) {
214 ret = ov_time_seek(of, i * chunk_time);
217 pos = ov_raw_tell(of);
218 diff = pos - old_pos;
219 max_chunk_len = PARA_MAX(max_chunk_len, diff);
220 min = (i == 1)? diff : PARA_MIN(min, diff);
221 afi->chunk_table[i] = pos;
222 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
223 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
224 // "size: %zd\n", i - 1,
225 // i * chunk_time, pos, pos - old_pos);
229 //fi->chunk_table[i] = pos;
230 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
231 num_chunks, chunk_time, max_chunk_len, min);
236 * Init oggvorbis file and write some tech data to given pointers.
238 static int ogg_get_file_info(char *map, size_t numbytes,
239 struct audio_format_info *afi)
244 const ov_callbacks ovc = {
245 .read_func = cb_read,
246 .seek_func = cb_seek,
247 .close_func = cb_close,
250 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
252 ret = ogg_compute_header_len(map, numbytes, afi);
255 ret = ogg_open_callbacks(&ods, &of, ovc);
259 vi = ov_info(&of, 0);
262 afi->seconds_total = ov_time_total(&of, -1);
263 afi->frequency = vi->rate;
264 afi->bitrate = ov_bitrate(&of, 0);
265 afi->channels = vi->channels;
266 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
267 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
268 "%d channels, %ukbps\n"
269 "audio_file_info2: \n"
270 "audio_file_info3: \n",
271 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
272 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
274 afi->chunk_tv.tv_sec = 0;
275 afi->chunk_tv.tv_usec = 250 * 1000;
276 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
279 ov_clear(&of); /* keeps the file open */
283 static const char* ogg_suffixes[] = {"ogg", NULL};
286 * the init function of the ogg vorbis audio format handler
288 * \param afh pointer to the struct to initialize
290 void ogg_init(struct audio_format_handler *afh)
292 afh->get_file_info = ogg_get_file_info,
293 afh->suffixes = ogg_suffixes;