dd0a54051c4196e6cebac887ec183f317bbe5cf4
[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 FILE *audio_file;
37 static int header_len;
38 static char *header;
39 static ssize_t *chunk_table;
40 static struct audio_format_handler *af;
41
42 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
43 {
44 FILE *f = datasource;
45 return fread(buf, size, nmemb, f);
46 }
47
48 static int cb_seek(__a_unused void *datasource, ogg_int64_t offset,
49 int whence)
50 {
51 FILE *f = datasource;
52 return fseek(f, offset, whence);
53 }
54
55 /* don't do anything as vss still needs the open filehandle */
56 static int cb_close(__a_unused void *datasource)
57 {
58 return 0;
59 }
60
61 long cb_tell(void *datasource)
62 {
63 FILE *f = datasource;
64 return ftell(f);
65 }
66
67 int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
68 {
69 int ret = ov_open_callbacks(datasource, vf,
70 NULL, /* no initial buffer */
71 0, /* no initial bytes */
72 c); /* the ov_open_callbacks */
73
74 /* FIXME: provide better error codes */
75 if (ret == OV_EREAD)
76 return -E_OGG_READ;
77 if (ret == OV_ENOTVORBIS)
78 return -E_OGG_READ;
79 if (ret == OV_EVERSION)
80 return -E_OGG_READ;
81 if (ret == OV_EBADHEADER)
82 return -E_OGG_READ;
83 if (ret < 0)
84 return -E_OGG_READ;
85 return 1;
86
87 }
88
89 static int ogg_compute_header_len(FILE *file)
90 {
91 int ret, len, in = fileno(file);
92 unsigned int serial;
93 char *buf;
94 ogg_page page;
95 ogg_packet packet;
96 vorbis_comment vc;
97 vorbis_info vi;
98 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
99 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
100 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
101
102 ogg_sync_init(sync_in);
103 vorbis_info_init(&vi);
104 vorbis_comment_init(&vc);
105 buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
106 len = read(in, buf, CHUNK_SIZE);
107 ret = -E_OGG_READ;
108 if (len <= 0)
109 goto err1;
110 ogg_sync_wrote(sync_in, len);
111 ret = -E_SYNC_PAGEOUT;
112 if (ogg_sync_pageout(sync_in, &page) <= 0)
113 goto err1;
114 serial = ogg_page_serialno(&page);
115 ogg_stream_init(stream_in, serial);
116 ogg_stream_init(stream_out, serial);
117 ret = ogg_stream_pagein(stream_in, &page);
118 if (ret < 0) {
119 ret = E_STREAM_PAGEIN;
120 goto err2;
121 }
122 ret = ogg_stream_packetout(stream_in, &packet);
123 if (ret != 1) {
124 ret = -E_STREAM_PACKETOUT;
125 goto err2;
126 }
127 ret = -E_VORBIS;
128 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
129 goto err2;
130 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
131 ogg_stream_packetin(stream_out, &packet);
132
133 ret = ogg_sync_pageout(sync_in, &page);
134 if (ret <= 0) {
135 ret = -E_SYNC_PAGEOUT;
136 goto err2;
137 }
138 ogg_stream_pagein(stream_in, &page);
139 ogg_stream_packetout(stream_in, &packet);
140 ogg_stream_packetin(stream_out, &packet);
141
142 ret = ogg_sync_pageout(sync_in, &page);
143 if (ret <= 0) {
144 ret = -E_SYNC_PAGEOUT;
145 goto err2;
146 }
147 ogg_stream_pagein(stream_in, &page);
148 ogg_stream_packetout(stream_in, &packet);
149 ogg_stream_packetin(stream_out, &packet);
150
151 header_len = 0;
152 while (ogg_stream_flush(stream_out, &page))
153 header_len += page.body_len + page.header_len;
154 ret = len;
155 PARA_INFO_LOG("header_len = %d\n", header_len);
156 err2:
157 ogg_stream_destroy(stream_in);
158 ogg_stream_destroy(stream_out);
159 err1:
160 ogg_sync_destroy(sync_in);
161 vorbis_info_clear(&vi);
162 vorbis_comment_clear(&vc);
163 return ret;
164 }
165
166 /*
167 * Alloc and fill array table of byte offsets. chunk_table[i] is the
168 * offset in the current input file at which the sample containing time i *
169 * CHUNK_TIME begins. Always successful.
170 */
171 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
172 double time_total)
173 {
174 int i, ret, num;
175 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
176 long unsigned num_chunks;
177
178 old_pos = 0;
179 ret = 0;
180 num = time_total / chunk_time + 3;
181 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
182 chunk_time, num);
183 chunk_table = para_malloc(num * sizeof(size_t));
184 chunk_table[0] = 0;
185 max_chunk_len = 0;
186 for (i = 1; ret == 0; i++) {
187 ogg_int64_t diff;
188 ret = ov_time_seek(of, i * chunk_time);
189 if (ret)
190 break;
191 pos = ov_raw_tell(of);
192 diff = pos - old_pos;
193 max_chunk_len = PARA_MAX(max_chunk_len, diff);
194 min = (i == 1)? diff : PARA_MIN(min, diff);
195 chunk_table[i] = pos;
196 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
197 PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
198 "size: %zd\n", i - 1,
199 i * chunk_time, pos, pos - old_pos);
200 old_pos = pos;
201 }
202 num_chunks = i - 1;
203 chunk_table[i] = pos;
204 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
205 num_chunks, chunk_time, max_chunk_len, min);
206 return num_chunks;
207 }
208
209 static void ogg_close_audio_file(void)
210 {
211 free(header);
212 free(chunk_table);
213 fclose(audio_file);
214 }
215
216 static int ogg_save_header(FILE *file, int len)
217 {
218 int ret;
219
220 header = para_malloc(len);
221 rewind(file);
222 ret = read(fileno(file), header, len);
223 if (ret == len)
224 return 1;
225 free(header);
226 return -E_OGG_READ;
227 }
228
229 /*
230 * Init oggvorbis file and write some tech data to given pointers.
231 */
232 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
233 int *seconds, size_t **vss_chunk_table)
234 {
235 int ret;
236 double time_total;
237 vorbis_info *vi;
238 ogg_int64_t raw_total;
239 long vi_sampling_rate, vi_bitrate;
240 OggVorbis_File of;
241 static const ov_callbacks ovc = {
242 .read_func = cb_read,
243 .seek_func = cb_seek,
244 .close_func = cb_close,
245 .tell_func = cb_tell
246 };
247
248 if (!file)
249 return -E_OGG_NO_FILE;
250 ret = ogg_compute_header_len(file);
251 if (ret < 0)
252 return ret;
253 ret = ogg_save_header(file, header_len);
254 if (ret < 0)
255 return ret;
256 rewind(file);
257 ret = ogg_open_callbacks(file, &of, ovc);
258 if (ret < 0)
259 goto err;
260 ret = -E_OGG_INFO;
261 vi = ov_info(&of, 0);
262 if (!vi)
263 goto err;
264 time_total = ov_time_total(&of, -1);
265 raw_total = ov_raw_total(&of, -1);
266 *seconds = time_total;
267 vi_sampling_rate = vi->rate;
268 vi_bitrate = ov_bitrate(&of, 0);
269 rewind(file);
270 *frames = ogg_compute_chunk_table(&of, time_total);
271 rewind(file);
272 *vss_chunk_table = chunk_table;
273 sprintf(info_str, "audio_file_info1:%lu x %lu, %ldkHz, %d channels, %ldkbps\n"
274 "audio_file_info2: \n"
275 "audio_file_info3: \n",
276 *frames, (long unsigned) (chunk_time * 1000 * 1000),
277 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
278 );
279 rewind(file);
280 audio_file = file;
281 ret = 1;
282 err:
283 ov_clear(&of); /* keeps the file open */
284 if (ret < 0)
285 free(header);
286 return ret;
287 }
288
289 static char *ogg_get_header_info(int *len)
290 {
291 *len = header_len;
292 return header;
293 }
294
295 static const char* ogg_suffixes[] = {"ogg", NULL};
296
297 /**
298 * the init function of the ogg vorbis audio format handler
299 *
300 * \param p pointer to the struct to initialize
301 */
302 void ogg_init(struct audio_format_handler *p)
303 {
304 af = p;
305 af->get_file_info = ogg_get_file_info,
306 af->close_audio_file = ogg_close_audio_file;
307 af->get_header_info = ogg_get_header_info;
308 af->chunk_tv.tv_sec = 0;
309 af->chunk_tv.tv_usec = 250 * 1000;
310 tv_scale(3, &af->chunk_tv, &af->eof_tv);
311 af->suffixes = ogg_suffixes;
312 }