vss: Take fec group durations into account when computing the eof barrier.
[paraslash.git] / ogg_afh.c
1 /*
2  * Copyright (C) 2004-2009 Andre Noll <maan@systemlinux.org>
3  *
4  * Licensed under the GPL v2. For licencing details see COPYING.
5  */
6 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
7
8 #include <inttypes.h>
9 #include <ogg/ogg.h>
10 #include <vorbis/codec.h>
11 #include <vorbis/vorbisfile.h>
12
13 #include "para.h"
14 #include "afh.h"
15 #include "error.h"
16 #include "string.h"
17 #include "afs.h"
18 #include "server.h"
19
20 /** must be big enough to hold header */
21 #define CHUNK_SIZE 32768
22 static double chunk_time = 0.25;
23
24 /** describes a memory-mapped ogg vorbis file */
25 struct ogg_datasource {
26         /** the memory mapping */
27         char *map;
28         /** this size of the mapping */
29         off_t numbytes;
30         /** the current position in the mapping */
31         off_t fpos;
32 };
33
34 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
35 {
36         struct ogg_datasource *ods = datasource;
37         size_t copy, ret;
38
39         if (!size)
40                 return 0;
41
42         assert(ods->numbytes >= ods->fpos);
43         ret = ods->numbytes - ods->fpos;
44         copy = PARA_MIN(ret, size * nmemb);
45         ret = copy / size;
46         if (!ret)
47                 return 0;
48         memcpy(buf, ods->map + ods->fpos, copy);
49 //      PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
50         ods->fpos += ret * size;
51         return ret;
52 }
53
54 static int cb_seek(void *datasource, ogg_int64_t offset,
55                 int whence)
56 {
57         struct ogg_datasource *ods = datasource;
58         switch (whence) {
59         case SEEK_SET:
60                 if (offset >= 0 && offset <= ods->numbytes) {
61                         ods->fpos = offset;
62                         return 0;
63                 }
64                 errno = EINVAL;
65                 return -1;
66                 break;
67         case SEEK_END:
68                 if (offset <= 0 && -offset <= ods->numbytes) {
69                         ods->fpos = ods->numbytes + offset;
70                         return 0;
71                 }
72                 errno = EINVAL;
73                 return -1;
74                 break;
75         case SEEK_CUR:
76                 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
77                                 (offset < 0 && offset + ods->fpos < 0)) {
78                         errno = EINVAL;
79                         return -1;
80                 }
81                 ods->fpos += offset;
82                 return 0;
83         }
84         errno = EINVAL;
85         return -1;
86 }
87
88 /* don't do anything as vss still needs the open filehandle */
89 static int cb_close(__a_unused void *datasource)
90 {
91         return 0;
92 }
93
94 static long cb_tell(void *datasource)
95 {
96         struct ogg_datasource *ods = datasource;
97         return (unsigned long)ods->fpos;
98 }
99
100 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
101 {
102         int ret = ov_open_callbacks(datasource, vf,
103                 NULL, /* no initial buffer */
104                 0, /* no initial bytes */
105                 c); /* the ov_open_callbacks */
106
107         if (ret == OV_EREAD)
108                 return -E_OGG_READ;
109         if (ret == OV_ENOTVORBIS)
110                 return -E_VORBIS;
111         if (ret == OV_EVERSION)
112                 return -E_OGG_VERSION;
113         if (ret == OV_EBADHEADER)
114                 return -E_OGG_BAD_HEADER;
115         if (ret < 0)
116                 return -E_OGG_UNKNOWN_ERROR;
117         return 1;
118
119 }
120
121 static int ogg_compute_header_len(char *map, size_t numbytes,
122                 struct afh_info *afhi)
123 {
124         int ret;
125         size_t len = PARA_MIN(numbytes, (size_t)CHUNK_SIZE);
126         int serial;
127         char *buf;
128
129         ogg_page page;
130         ogg_packet packet;
131         vorbis_comment vc;
132         vorbis_info vi;
133         ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
134         ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
135         ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
136
137         ogg_sync_init(sync_in);
138         vorbis_info_init(&vi);
139         vorbis_comment_init(&vc);
140         buf = ogg_sync_buffer(sync_in, (long)len);
141         memcpy(buf, map, len);
142         ogg_sync_wrote(sync_in, (long)len);
143         ret = -E_SYNC_PAGEOUT;
144         if (ogg_sync_pageout(sync_in, &page) <= 0) {
145                 free(stream_in);
146                 free(stream_out);
147                 goto err1;
148         }
149         serial = ogg_page_serialno(&page);
150         ogg_stream_init(stream_in, serial);
151         ogg_stream_init(stream_out, serial);
152         ret = ogg_stream_pagein(stream_in, &page);
153         if (ret < 0) {
154                 ret = -E_STREAM_PAGEIN;
155                 goto err2;
156         }
157         ret = ogg_stream_packetout(stream_in, &packet);
158         if (ret != 1) {
159                 ret = -E_STREAM_PACKETOUT;
160                 goto err2;
161         }
162         ret = -E_VORBIS;
163         if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
164                 goto err2;
165         PARA_DEBUG_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
166         ogg_stream_packetin(stream_out, &packet);
167         ret = ogg_sync_pageout(sync_in, &page);
168         if (ret <= 0) {
169                 ret = -E_SYNC_PAGEOUT;
170                 goto err2;
171         }
172         ogg_stream_pagein(stream_in, &page);
173         ogg_stream_packetout(stream_in, &packet);
174         ogg_stream_packetin(stream_out, &packet);
175
176         ret = ogg_sync_pageout(sync_in, &page);
177         if (ret <= 0) {
178                 ret = -E_SYNC_PAGEOUT;
179                 goto err2;
180         }
181         ogg_stream_pagein(stream_in, &page);
182         ogg_stream_packetout(stream_in, &packet);
183         ogg_stream_packetin(stream_out, &packet);
184
185         afhi->header_len = 0;
186         while (ogg_stream_flush(stream_out, &page))
187                 afhi->header_len += page.body_len + page.header_len;
188         PARA_DEBUG_LOG("header_len = %d\n", afhi->header_len);
189         afhi->header_offset = 0;
190         ret = 1;
191 err2:
192         ogg_stream_destroy(stream_in);
193         ogg_stream_destroy(stream_out);
194 err1:
195         ogg_sync_destroy(sync_in);
196         vorbis_info_clear(&vi);
197         vorbis_comment_clear(&vc);
198         return ret;
199 }
200
201 /*
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.
205  */
206 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
207         struct afh_info *afhi, long unsigned time_total)
208 {
209         int i, ret, num;
210         long unsigned num_chunks;
211         ogg_int64_t max = 0, min = 0, old_pos = 0;
212
213         ret = 0;
214         num = time_total / chunk_time + 3;
215         PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
216                 chunk_time, num);
217         afhi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
218         afhi->chunk_table[0] = 0;
219         for (i = 1; i <= num; i++) {
220                 ogg_int64_t diff, pos;
221                 ret = ov_time_seek(of, i * chunk_time);
222                 if (ret)
223                         break;
224                 pos = ov_raw_tell(of);
225                 diff = pos - old_pos;
226                 max = PARA_MAX(max, diff);
227                 min = (i == 1)? diff : PARA_MIN(min, diff);
228                 afhi->chunk_table[i] = pos;
229                 old_pos = pos;
230         }
231         num_chunks = i - 1;
232         PARA_DEBUG_LOG("%lu chunks (%fs), max chunk: %lld, min chunk: %lld\n",
233                 num_chunks, chunk_time, (long long)max, (long long)min);
234         return num_chunks;
235 }
236
237 static void ogg_write_info_string(OggVorbis_File *vf, struct afh_info *afhi)
238 {
239         char *taginfo;
240         vorbis_comment *vc = ov_comment(vf,-1);
241
242         if (vc) {
243                 char *artist, *title, *album, *year, *comment;
244                 artist = vorbis_comment_query(vc, "artist", 0);
245                 title = vorbis_comment_query(vc, "title", 0);
246                 album = vorbis_comment_query(vc, "album", 0);
247                 year = vorbis_comment_query(vc, "year", 0);
248                 comment = vorbis_comment_query(vc, "comment", 0);
249                 taginfo = make_taginfo(title, artist, album, year, comment);
250         } else
251                 taginfo = make_message("%s: (no vorbis comments found)\n%s:\n",
252                         status_item_list[SI_TAGINFO1],
253                         status_item_list[SI_TAGINFO2]);
254         afhi->info_string = make_message("%s:\n%s",
255                 status_item_list[SI_AUDIO_FILE_INFO], taginfo);
256         free(taginfo);
257 }
258
259 /*
260  * Init oggvorbis file and write some tech data to given pointers.
261  */
262 static int ogg_get_file_info(char *map, size_t numbytes, __a_unused int fd,
263                 struct afh_info *afhi)
264 {
265         int ret;
266         vorbis_info *vi;
267         OggVorbis_File of;
268         const ov_callbacks ovc = {
269                 .read_func = cb_read,
270                 .seek_func = cb_seek,
271                 .close_func = cb_close,
272                 .tell_func = cb_tell
273         };
274         struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
275
276         ret = ogg_compute_header_len(map, numbytes, afhi);
277         if (ret < 0)
278                 return ret;
279         ret = ogg_open_callbacks(&ods, &of, ovc);
280         if (ret < 0)
281                 goto err;
282         ret = -E_OGG_INFO;
283         vi = ov_info(&of, 0);
284         if (!vi)
285                 goto err;
286         afhi->seconds_total = ov_time_total(&of, -1);
287         afhi->frequency = vi->rate;
288         afhi->bitrate = ov_bitrate(&of, 0) / 1000;
289         afhi->channels = vi->channels;
290         afhi->chunks_total = ogg_compute_chunk_table(&of, afhi, afhi->seconds_total);
291         afhi->chunk_tv.tv_sec = 0;
292         afhi->chunk_tv.tv_usec = 250 * 1000;
293         tv_scale(10 / afhi->channels, &afhi->chunk_tv, &afhi->eof_tv);
294         ogg_write_info_string(&of, afhi);
295         ret = 1;
296 err:
297         ov_clear(&of); /* keeps the file open */
298         return ret;
299 }
300
301 static const char* ogg_suffixes[] = {"ogg", NULL};
302
303 /**
304  * the init function of the ogg vorbis audio format handler
305  *
306  * \param afh pointer to the struct to initialize
307  */
308 void ogg_init(struct audio_format_handler *afh)
309 {
310         afh->get_file_info = ogg_get_file_info,
311         afh->suffixes = ogg_suffixes;
312 }