first draft of the mmap patch series
[paraslash.git] / ogg_afh.c
1 /*
2 * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
3 *
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.
8 *
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.
13 *
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.
17 */
18 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
19
20 #include <inttypes.h>
21 #include <ogg/ogg.h>
22 #include <vorbis/codec.h>
23 #include <vorbis/vorbisfile.h>
24
25 #include "server.cmdline.h"
26 #include "server.h"
27 #include "vss.h"
28 #include "error.h"
29 #include "string.h"
30
31 /** must be big enough to hold header */
32 #define CHUNK_SIZE 32768
33 static double chunk_time = 0.25;
34
35 struct ogg_datasource {
36 char *map;
37 off_t numbytes;
38 off_t fpos;
39 };
40
41 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
42 {
43 struct ogg_datasource *ods = datasource;
44 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, 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 /* FIXME: provide better error codes */
108 if (ret == OV_EREAD)
109 return -E_OGG_READ;
110 if (ret == OV_ENOTVORBIS)
111 return -E_OGG_READ;
112 if (ret == OV_EVERSION)
113 return -E_OGG_READ;
114 if (ret == OV_EBADHEADER)
115 return -E_OGG_READ;
116 if (ret < 0)
117 return -E_OGG_READ;
118 return 1;
119
120 }
121
122 static void ogg_save_header(char *map, struct audio_format_info *afi)
123 {
124 afi->header = para_malloc(afi->header_len);
125 memcpy(afi->header, map, afi->header_len);
126 }
127
128 static int ogg_compute_header_len(char *map, off_t numbytes,
129 struct audio_format_info *afi)
130 {
131 int ret, len = PARA_MIN(numbytes, CHUNK_SIZE);
132 unsigned int serial;
133 char *buf;
134 ogg_page page;
135 ogg_packet packet;
136 vorbis_comment vc;
137 vorbis_info vi;
138 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
139 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
140 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
141
142 ogg_sync_init(sync_in);
143 vorbis_info_init(&vi);
144 vorbis_comment_init(&vc);
145 buf = ogg_sync_buffer(sync_in, len);
146 memcpy(buf, map, len);
147 ogg_sync_wrote(sync_in, len);
148 ret = -E_SYNC_PAGEOUT;
149 if (ogg_sync_pageout(sync_in, &page) <= 0)
150 goto err1;
151 serial = ogg_page_serialno(&page);
152 ogg_stream_init(stream_in, serial);
153 ogg_stream_init(stream_out, serial);
154 ret = ogg_stream_pagein(stream_in, &page);
155 if (ret < 0) {
156 ret = E_STREAM_PAGEIN;
157 goto err2;
158 }
159 ret = ogg_stream_packetout(stream_in, &packet);
160 if (ret != 1) {
161 ret = -E_STREAM_PACKETOUT;
162 goto err2;
163 }
164 ret = -E_VORBIS;
165 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
166 goto err2;
167 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
168 ogg_stream_packetin(stream_out, &packet);
169
170 ret = ogg_sync_pageout(sync_in, &page);
171 if (ret <= 0) {
172 ret = -E_SYNC_PAGEOUT;
173 goto err2;
174 }
175 ogg_stream_pagein(stream_in, &page);
176 ogg_stream_packetout(stream_in, &packet);
177 ogg_stream_packetin(stream_out, &packet);
178
179 ret = ogg_sync_pageout(sync_in, &page);
180 if (ret <= 0) {
181 ret = -E_SYNC_PAGEOUT;
182 goto err2;
183 }
184 ogg_stream_pagein(stream_in, &page);
185 ogg_stream_packetout(stream_in, &packet);
186 ogg_stream_packetin(stream_out, &packet);
187
188 afi->header_len = 0;
189 while (ogg_stream_flush(stream_out, &page))
190 afi->header_len += page.body_len + page.header_len;
191 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
192 ogg_save_header(map, afi);
193 ret = 1;
194 err2:
195 ogg_stream_destroy(stream_in);
196 ogg_stream_destroy(stream_out);
197 err1:
198 ogg_sync_destroy(sync_in);
199 vorbis_info_clear(&vi);
200 vorbis_comment_clear(&vc);
201 return ret;
202 }
203
204 /*
205 * Alloc and fill array table of byte offsets. chunk_table[i] is the
206 * offset in the current input file at which the sample containing time i *
207 * CHUNK_TIME begins. Always successful.
208 */
209 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
210 struct audio_format_info *afi, double time_total)
211 {
212 int i, ret, num;
213 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
214 long unsigned num_chunks;
215
216 old_pos = 0;
217 ret = 0;
218 num = time_total / chunk_time + 3;
219 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
220 chunk_time, num);
221 afi->chunk_table = para_malloc(num * sizeof(size_t));
222 afi->chunk_table[0] = 0;
223 max_chunk_len = 0;
224 for (i = 1; ret == 0; i++) {
225 ogg_int64_t diff;
226 ret = ov_time_seek(of, i * chunk_time);
227 if (ret)
228 break;
229 pos = ov_raw_tell(of);
230 diff = pos - old_pos;
231 max_chunk_len = PARA_MAX(max_chunk_len, diff);
232 min = (i == 1)? diff : PARA_MIN(min, diff);
233 afi->chunk_table[i] = pos;
234 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
235 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
236 // "size: %zd\n", i - 1,
237 // i * chunk_time, pos, pos - old_pos);
238 old_pos = pos;
239 }
240 num_chunks = i - 1;
241 afi->chunk_table[i] = pos;
242 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
243 num_chunks, chunk_time, max_chunk_len, min);
244 return num_chunks;
245 }
246
247 /*
248 * Init oggvorbis file and write some tech data to given pointers.
249 */
250 static int ogg_get_file_info(FILE *file, char *map, off_t numbytes,
251 struct audio_format_info *afi)
252 {
253 int ret;
254 double time_total;
255 vorbis_info *vi;
256 ogg_int64_t raw_total;
257 long vi_sampling_rate, vi_bitrate;
258 OggVorbis_File of;
259 const ov_callbacks ovc = {
260 .read_func = cb_read,
261 .seek_func = cb_seek,
262 .close_func = cb_close,
263 .tell_func = cb_tell
264 };
265 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
266
267 ret = ogg_compute_header_len(map, numbytes, afi);
268 if (ret < 0)
269 return ret;
270 ret = ogg_open_callbacks(&ods, &of, ovc);
271 if (ret < 0)
272 goto err;
273 ret = -E_OGG_INFO;
274 vi = ov_info(&of, 0);
275 if (!vi)
276 goto err;
277 time_total = ov_time_total(&of, -1);
278 raw_total = ov_raw_total(&of, -1);
279 afi->seconds_total = time_total;
280 vi_sampling_rate = vi->rate;
281 vi_bitrate = ov_bitrate(&of, 0);
282 afi->chunks_total = ogg_compute_chunk_table(&of, afi, time_total);
283 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ldkHz, "
284 "%d channels, %ldkbps\n"
285 "audio_file_info2: \n"
286 "audio_file_info3: \n",
287 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
288 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
289 );
290 afi->chunk_tv.tv_sec = 0;
291 afi->chunk_tv.tv_usec = 250 * 1000;
292 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
293 ret = 1;
294 err:
295 ov_clear(&of); /* keeps the file open */
296 if (ret < 0)
297 free(afi->header);
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 }