a3e0f6911cea762eabe1bb59a09b277212643f4b
[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 #include "fd.h"
32
33 /** must be big enough to hold header */
34 #define CHUNK_SIZE 32768
35 static double chunk_time = 0.25;
36
37 static OggVorbis_File *oggvorbis_file;
38 static FILE *infile;
39 static int header_len, vi_channels;
40 static char *header;
41 static ssize_t *chunk_table, max_chunk_len, num_chunks;
42 static struct audio_format_handler *af;
43 static long vi_sampling_rate, vi_bitrate, vi_bitrate_nominal;
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("%zu 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 }
205
206 static int ogg_save_header(FILE *file, int len)
207 {
208 int ret;
209
210 header = para_malloc(len);
211 rewind(file);
212 ret = read(fileno(file), header, len);
213 if (ret != len)
214 return -E_OGG_READ;
215 return 1;
216 }
217
218 /*
219 * Init oggvorbis file and write some tech data to given pointers.
220 */
221 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
222 int *seconds, size_t **vss_chunk_table)
223 {
224 int ret;
225 double time_total;
226 vorbis_info *vi;
227 ogg_int64_t raw_total;
228
229 infile = file;
230 if (!file)
231 return -E_OGG_NO_FILE;
232 ret = ogg_compute_header_len();
233 if (ret < 0)
234 return ret;
235 ret = ogg_save_header(file, header_len);
236 if (ret < 0)
237 return ret;
238 rewind(file);
239 oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
240 ret = ov_open(file, oggvorbis_file, NULL, 0);
241 if (ret < 0) {
242 free(oggvorbis_file);
243 free(header);
244 return -E_OGG_OPEN;
245 }
246 ret = -E_OGG_INFO;
247 vi = ov_info(oggvorbis_file, 0);
248 if (!vi)
249 goto err;
250 time_total = ov_time_total(oggvorbis_file, -1);
251 raw_total = ov_raw_total(oggvorbis_file, -1);
252 *seconds = time_total;
253 vi_sampling_rate = vi->rate;
254 vi_bitrate = ov_bitrate(oggvorbis_file, 0);
255 vi_bitrate_nominal = vi->bitrate_nominal;
256 vi_channels = vi->channels;
257 ogg_compute_chunk_table(time_total);
258 *frames = num_chunks;
259 *vss_chunk_table = chunk_table;
260 sprintf(info_str, "audio_file_info1:%zu x %lu, %ldkHz, %d channels, %ldkbps\n"
261 "audio_file_info2: \n"
262 "audio_file_info3: \n",
263 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
264 vi_sampling_rate / 1000, vi_channels, vi_bitrate / 1000
265 );
266 rewind(file);
267 return 1;
268 err:
269 ogg_close_audio_file();
270 return ret;
271 }
272
273 static char *ogg_get_header_info(int *len)
274 {
275 *len = header_len;
276 return header;
277 }
278
279 static const char* ogg_suffixes[] = {"ogg", NULL};
280
281 /**
282 * the init function of the ogg vorbis audio format handler
283 *
284 * \param p pointer to the struct to initialize
285 */
286 void ogg_init(struct audio_format_handler *p)
287 {
288 af = p;
289 af->get_file_info = ogg_get_file_info,
290 af->close_audio_file = ogg_close_audio_file;
291 af->get_header_info = ogg_get_header_info;
292 af->chunk_tv.tv_sec = 0;
293 af->chunk_tv.tv_usec = 250 * 1000;
294 tv_scale(3, &af->chunk_tv, &af->eof_tv);
295 af->suffixes = ogg_suffixes;
296 }