ogg_afh.c: Rename oggbuf to inbuf
[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 "afh.h"
29 #include "error.h"
30 #include "string.h"
31
32 /** must be big enough to hold header */
33 #define CHUNK_SIZE 32768
34 static double chunk_time = 0.25;
35
36 static OggVorbis_File *oggvorbis_file;
37 static FILE *infile;
38 static int header_len, oggbuf_len, vi_channels;
39 static char *header, *inbuf;
40 static ssize_t *chunk_table, max_chunk_len;
41 static struct audio_format_handler *af;
42 static long vi_sampling_rate, vi_bitrate, vi_bitrate_nominal,
43 num_chunks;
44
45 static int ogg_compute_header_len(void)
46 {
47 int ret, len, in = fileno(infile);
48 unsigned int serial;
49 char *buf;
50 ogg_page page;
51 ogg_packet packet;
52 vorbis_comment vc;
53 vorbis_info vi;
54 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
55 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
56 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
57
58 ogg_sync_init(sync_in);
59 vorbis_info_init(&vi);
60 vorbis_comment_init(&vc);
61 buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
62 len = read(in, buf, CHUNK_SIZE);
63 ret = -E_OGG_READ;
64 if (len <= 0)
65 goto err1;
66 ogg_sync_wrote(sync_in, len);
67 ret = -E_SYNC_PAGEOUT;
68 if (ogg_sync_pageout(sync_in, &page) <= 0)
69 goto err1;
70 serial = ogg_page_serialno(&page);
71 ogg_stream_init(stream_in, serial);
72 ogg_stream_init(stream_out, serial);
73 ret = ogg_stream_pagein(stream_in, &page);
74 if (ret < 0) {
75 ret = E_STREAM_PAGEIN;
76 goto err2;
77 }
78 ret = ogg_stream_packetout(stream_in, &packet);
79 if (ret != 1) {
80 ret = -E_STREAM_PACKETOUT;
81 goto err2;
82 }
83 ret = -E_VORBIS;
84 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
85 goto err2;
86 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
87 ogg_stream_packetin(stream_out, &packet);
88
89 ret = ogg_sync_pageout(sync_in, &page);
90 if (ret <= 0) {
91 ret = -E_SYNC_PAGEOUT;
92 goto err2;
93 }
94 ogg_stream_pagein(stream_in, &page);
95 ogg_stream_packetout(stream_in, &packet);
96 ogg_stream_packetin(stream_out, &packet);
97
98 ret = ogg_sync_pageout(sync_in, &page);
99 if (ret <= 0) {
100 ret = -E_SYNC_PAGEOUT;
101 goto err2;
102 }
103 ogg_stream_pagein(stream_in, &page);
104 ogg_stream_packetout(stream_in, &packet);
105 ogg_stream_packetin(stream_out, &packet);
106
107 header_len = 0;
108 while (ogg_stream_flush(stream_out, &page))
109 header_len += page.body_len + page.header_len;
110 ret = len;
111 PARA_INFO_LOG("header_len = %d\n", header_len);
112 err2:
113 ogg_stream_destroy(stream_in);
114 ogg_stream_destroy(stream_out);
115 err1:
116 ogg_sync_destroy(sync_in);
117 vorbis_info_clear(&vi);
118 vorbis_comment_clear(&vc);
119 return ret;
120 }
121
122 static void tunetable(void)
123 {
124 int i = 1, j = -1, lp = 1;
125 while (i < num_chunks) {
126 if (chunk_table[i] == chunk_table[lp]) {
127 i++;
128 continue;
129 }
130 if (j < 0)
131 tv_scale(i, &af->chunk_tv, &af->eof_tv);
132 for (j = lp; j < i; j++)
133 chunk_table[j] = chunk_table[i];
134 lp = i;
135 }
136 #if 1
137 for (i = 2; i < num_chunks; i++)
138 if (chunk_table[i] != chunk_table[1])
139 break;
140 lp = i;
141 for (i = 2; i < num_chunks - lp; i++)
142 chunk_table[i] = chunk_table[i + lp];
143 #endif
144 }
145
146
147 /*
148 * Alloc and fill array table of byte offsets. chunk_table[i] is the
149 * offset in the current infile at which the sample containing time i *
150 * CHUNK_TIME begins.
151 */
152 static void ogg_compute_chunk_table(double time_total)
153 {
154 int i, ret, num;
155 ssize_t pos = 0, min = 0, old_pos;
156
157 old_pos = 0;
158 ret = 0;
159 num = time_total / chunk_time + 3;
160 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
161 chunk_time, num);
162 chunk_table = para_malloc(num * sizeof(size_t));
163 chunk_table[0] = 0;
164 max_chunk_len = 0;
165 rewind(infile);
166 for (i = 1; ret == 0; i++) {
167 ogg_int64_t diff;
168 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
169 if (ret)
170 break;
171 pos = ov_raw_tell(oggvorbis_file);
172 diff = pos - old_pos;
173 max_chunk_len = PARA_MAX(max_chunk_len, diff);
174 min = (i == 1)? diff : PARA_MIN(min, diff);
175 chunk_table[i] = pos;
176 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
177 PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
178 "size: %zd\n", i - 1,
179 i * chunk_time, pos, pos - old_pos);
180 old_pos = pos;
181 }
182 num_chunks = i - 1;
183 chunk_table[i] = pos;
184 tunetable();
185 PARA_INFO_LOG("%li chunks (%fs), max chunk: %zd, min chunk: %zd\n",
186 num_chunks, chunk_time, max_chunk_len, min);
187 rewind(infile);
188 }
189
190 static void ogg_close_audio_file(void)
191 {
192 if (oggvorbis_file) {
193 PARA_DEBUG_LOG("%s", "ov_clear\n");
194 ov_clear(oggvorbis_file);
195 free(oggvorbis_file);
196 oggvorbis_file = NULL;
197 }
198 free(header);
199 header = NULL;
200 header_len = 0;
201 free(chunk_table);
202 chunk_table = NULL;
203 num_chunks = 0;
204 free(inbuf);
205 inbuf = NULL;
206 oggbuf_len = 0;
207 }
208
209 static int ogg_save_header(FILE *file, int len)
210 {
211 int ret;
212
213 header = para_malloc(len);
214 rewind(file);
215 ret = read(fileno(file), header, len);
216 if (ret != len)
217 return -E_OGG_READ;
218 return 1;
219 }
220
221 /*
222 * Init oggvorbis file and write some tech data to given pointers.
223 */
224 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
225 int *seconds)
226 {
227 int ret;
228 double time_total;
229 vorbis_info *vi;
230 ogg_int64_t raw_total;
231
232 infile = file;
233 if (!file)
234 return -E_OGG_NO_FILE;
235 ret = ogg_compute_header_len();
236 if (ret < 0)
237 return ret;
238 ret = ogg_save_header(file, header_len);
239 if (ret < 0)
240 return ret;
241 rewind(file);
242 oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
243 ret = ov_open(file, oggvorbis_file, NULL, 0);
244 if (ret < 0) {
245 free(oggvorbis_file);
246 free(header);
247 return -E_OGG_OPEN;
248 }
249 ret = -E_OGG_INFO;
250 vi = ov_info(oggvorbis_file, 0);
251 if (!vi)
252 goto err;
253 time_total = ov_time_total(oggvorbis_file, -1);
254 raw_total = ov_raw_total(oggvorbis_file, -1);
255 *seconds = time_total;
256 vi_sampling_rate = vi->rate;
257 vi_bitrate = ov_bitrate(oggvorbis_file, 0);
258 vi_bitrate_nominal = vi->bitrate_nominal;
259 vi_channels = vi->channels;
260 ogg_compute_chunk_table(time_total);
261 *frames = num_chunks;
262 sprintf(info_str, "audio_file_info1:%lu x %lu, %ldkHz, %d channels, %ldkbps\n"
263 "audio_file_info2: \n"
264 "audio_file_info3: \n",
265 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
266 vi_sampling_rate / 1000, vi_channels, vi_bitrate / 1000
267 );
268 rewind(file);
269 return 1;
270 err:
271 ogg_close_audio_file();
272 return ret;
273 }
274
275 /*
276 * Simple stream reposition routine
277 */
278 static int ogg_reposition_stream(long unsigned request)
279 {
280 int ret;
281 long seek;
282
283 seek = chunk_table[request];
284 ret = fseek(infile, seek, SEEK_SET);
285 PARA_DEBUG_LOG("seek to %li returned %d. offset:%li\n", seek,
286 ret, ftell(infile));
287 return ret < 0? -E_OGG_REPOS : 1;
288 }
289
290 static ogg_int64_t get_chunk_size(long unsigned chunk_num)
291 {
292 ogg_int64_t ret;
293 if (chunk_num >= num_chunks)
294 return -1;
295 ret = chunk_table[chunk_num + 1] - chunk_table[chunk_num];
296 if (!ret)
297 return ret;
298 #if 0
299 PARA_DEBUG_LOG("chunk %d: %lli-%lli (%lli bytes)\n",
300 chunk_num,
301 chunk_table[chunk_num],
302 chunk_table[chunk_num + 1] - 1,
303 ret);
304 #endif
305 return ret;
306 }
307
308 static char *ogg_read_chunk(long unsigned current_chunk, ssize_t *len)
309 {
310 int ret;
311 ogg_int64_t cs = get_chunk_size(current_chunk);
312 if (!cs) { /* nothing to send for this run */
313 *len = 0;
314 return inbuf;
315 }
316 if (cs < 0) { /* eof */
317 *len = 0;
318 return NULL;
319 }
320 *len = cs;
321 if (!inbuf || oggbuf_len < *len) {
322 PARA_INFO_LOG("increasing ogg buffer size (%d -> %zu)\n",
323 oggbuf_len, *len);
324 inbuf = para_realloc(inbuf, *len);
325 oggbuf_len = *len;
326 }
327 ret = read(fileno(infile), inbuf, *len);
328 if (!ret) {
329 *len = 0;
330 return NULL;
331 }
332 if (ret < 0) {
333 *len = -E_OGG_READ;
334 return NULL;
335 }
336 if (ret != *len)
337 PARA_WARNING_LOG("short read (%d/%zd)\n", ret, *len);
338 *len = ret;
339 return inbuf;
340 }
341
342 static char *ogg_get_header_info(int *len)
343 {
344 *len = header_len;
345 return header;
346 }
347
348 static const char* ogg_suffixes[] = {"ogg", NULL};
349
350 /**
351 * the init function of the ogg vorbis audio format handler
352 *
353 * \param p pointer to the struct to initialize
354 */
355 void ogg_init(struct audio_format_handler *p)
356 {
357 af = p;
358 af->reposition_stream = ogg_reposition_stream;
359 af->get_file_info = ogg_get_file_info,
360 af->read_chunk = ogg_read_chunk;
361 af->close_audio_file = ogg_close_audio_file;
362 af->get_header_info = ogg_get_header_info;
363 af->chunk_tv.tv_sec = 0;
364 af->chunk_tv.tv_usec = 250 * 1000;
365 tv_scale(3, &af->chunk_tv, &af->eof_tv);
366 af->suffixes = ogg_suffixes;
367 }