ba9ef369b8761e6dac8e4c98a08c1673c7941f64
[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 int header_len;
39 static char *header;
40 static ssize_t *chunk_table, num_chunks;
41 static struct audio_format_handler *af;
42
43 static int ogg_compute_header_len(FILE *file)
44 {
45 int ret, len, in = fileno(file);
46 unsigned int serial;
47 char *buf;
48 ogg_page page;
49 ogg_packet packet;
50 vorbis_comment vc;
51 vorbis_info vi;
52 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
53 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
54 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
55
56 ogg_sync_init(sync_in);
57 vorbis_info_init(&vi);
58 vorbis_comment_init(&vc);
59 buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
60 len = read(in, buf, CHUNK_SIZE);
61 ret = -E_OGG_READ;
62 if (len <= 0)
63 goto err1;
64 ogg_sync_wrote(sync_in, len);
65 ret = -E_SYNC_PAGEOUT;
66 if (ogg_sync_pageout(sync_in, &page) <= 0)
67 goto err1;
68 serial = ogg_page_serialno(&page);
69 ogg_stream_init(stream_in, serial);
70 ogg_stream_init(stream_out, serial);
71 ret = ogg_stream_pagein(stream_in, &page);
72 if (ret < 0) {
73 ret = E_STREAM_PAGEIN;
74 goto err2;
75 }
76 ret = ogg_stream_packetout(stream_in, &packet);
77 if (ret != 1) {
78 ret = -E_STREAM_PACKETOUT;
79 goto err2;
80 }
81 ret = -E_VORBIS;
82 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
83 goto err2;
84 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
85 ogg_stream_packetin(stream_out, &packet);
86
87 ret = ogg_sync_pageout(sync_in, &page);
88 if (ret <= 0) {
89 ret = -E_SYNC_PAGEOUT;
90 goto err2;
91 }
92 ogg_stream_pagein(stream_in, &page);
93 ogg_stream_packetout(stream_in, &packet);
94 ogg_stream_packetin(stream_out, &packet);
95
96 ret = ogg_sync_pageout(sync_in, &page);
97 if (ret <= 0) {
98 ret = -E_SYNC_PAGEOUT;
99 goto err2;
100 }
101 ogg_stream_pagein(stream_in, &page);
102 ogg_stream_packetout(stream_in, &packet);
103 ogg_stream_packetin(stream_out, &packet);
104
105 header_len = 0;
106 while (ogg_stream_flush(stream_out, &page))
107 header_len += page.body_len + page.header_len;
108 ret = len;
109 PARA_INFO_LOG("header_len = %d\n", header_len);
110 err2:
111 ogg_stream_destroy(stream_in);
112 ogg_stream_destroy(stream_out);
113 err1:
114 ogg_sync_destroy(sync_in);
115 vorbis_info_clear(&vi);
116 vorbis_comment_clear(&vc);
117 return ret;
118 }
119
120 static void tunetable(void)
121 {
122 int i = 1, j = -1, lp = 1;
123 while (i < num_chunks) {
124 if (chunk_table[i] == chunk_table[lp]) {
125 i++;
126 continue;
127 }
128 if (j < 0)
129 tv_scale(i, &af->chunk_tv, &af->eof_tv);
130 for (j = lp; j < i; j++)
131 chunk_table[j] = chunk_table[i];
132 lp = i;
133 }
134 #if 1
135 for (i = 2; i < num_chunks; i++)
136 if (chunk_table[i] != chunk_table[1])
137 break;
138 lp = i;
139 for (i = 2; i < num_chunks - lp; i++)
140 chunk_table[i] = chunk_table[i + lp];
141 #endif
142 }
143
144
145 /*
146 * Alloc and fill array table of byte offsets. chunk_table[i] is the
147 * offset in the current input file at which the sample containing time i *
148 * CHUNK_TIME begins.
149 */
150 static void ogg_compute_chunk_table(double time_total)
151 {
152 int i, ret, num;
153 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
154
155 old_pos = 0;
156 ret = 0;
157 num = time_total / chunk_time + 3;
158 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
159 chunk_time, num);
160 chunk_table = para_malloc(num * sizeof(size_t));
161 chunk_table[0] = 0;
162 max_chunk_len = 0;
163 for (i = 1; ret == 0; i++) {
164 ogg_int64_t diff;
165 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
166 if (ret)
167 break;
168 pos = ov_raw_tell(oggvorbis_file);
169 diff = pos - old_pos;
170 max_chunk_len = PARA_MAX(max_chunk_len, diff);
171 min = (i == 1)? diff : PARA_MIN(min, diff);
172 chunk_table[i] = pos;
173 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
174 PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
175 "size: %zd\n", i - 1,
176 i * chunk_time, pos, pos - old_pos);
177 old_pos = pos;
178 }
179 num_chunks = i - 1;
180 chunk_table[i] = pos;
181 tunetable();
182 PARA_INFO_LOG("%zu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
183 num_chunks, chunk_time, max_chunk_len, min);
184 }
185
186 static void ogg_close_audio_file(void)
187 {
188 if (oggvorbis_file) {
189 PARA_DEBUG_LOG("%s", "ov_clear\n");
190 ov_clear(oggvorbis_file);
191 free(oggvorbis_file);
192 oggvorbis_file = NULL;
193 }
194 free(header);
195 header = NULL;
196 header_len = 0;
197 free(chunk_table);
198 chunk_table = NULL;
199 num_chunks = 0;
200 }
201
202 static int ogg_save_header(FILE *file, int len)
203 {
204 int ret;
205
206 header = para_malloc(len);
207 rewind(file);
208 ret = read(fileno(file), header, len);
209 if (ret != len)
210 return -E_OGG_READ;
211 return 1;
212 }
213
214 /*
215 * Init oggvorbis file and write some tech data to given pointers.
216 */
217 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
218 int *seconds, size_t **vss_chunk_table)
219 {
220 int ret;
221 double time_total;
222 vorbis_info *vi;
223 ogg_int64_t raw_total;
224 long vi_sampling_rate, vi_bitrate;
225
226 if (!file)
227 return -E_OGG_NO_FILE;
228 ret = ogg_compute_header_len(file);
229 if (ret < 0)
230 return ret;
231 ret = ogg_save_header(file, header_len);
232 if (ret < 0)
233 return ret;
234 rewind(file);
235 oggvorbis_file = para_malloc(sizeof(OggVorbis_File));
236 ret = ov_open(file, oggvorbis_file, NULL, 0);
237 if (ret < 0) {
238 free(oggvorbis_file);
239 free(header);
240 return -E_OGG_OPEN;
241 }
242 ret = -E_OGG_INFO;
243 vi = ov_info(oggvorbis_file, 0);
244 if (!vi)
245 goto err;
246 time_total = ov_time_total(oggvorbis_file, -1);
247 raw_total = ov_raw_total(oggvorbis_file, -1);
248 *seconds = time_total;
249 vi_sampling_rate = vi->rate;
250 vi_bitrate = ov_bitrate(oggvorbis_file, 0);
251 rewind(file);
252 ogg_compute_chunk_table(time_total);
253 rewind(file);
254 *frames = num_chunks;
255 *vss_chunk_table = chunk_table;
256 sprintf(info_str, "audio_file_info1:%zu x %lu, %ldkHz, %d channels, %ldkbps\n"
257 "audio_file_info2: \n"
258 "audio_file_info3: \n",
259 num_chunks, (long unsigned) (chunk_time * 1000 * 1000),
260 vi_sampling_rate / 1000, vi->channels, vi_bitrate / 1000
261 );
262 rewind(file);
263 return 1;
264 err:
265 ogg_close_audio_file();
266 return ret;
267 }
268
269 static char *ogg_get_header_info(int *len)
270 {
271 *len = header_len;
272 return header;
273 }
274
275 static const char* ogg_suffixes[] = {"ogg", NULL};
276
277 /**
278 * the init function of the ogg vorbis audio format handler
279 *
280 * \param p pointer to the struct to initialize
281 */
282 void ogg_init(struct audio_format_handler *p)
283 {
284 af = p;
285 af->get_file_info = ogg_get_file_info,
286 af->close_audio_file = ogg_close_audio_file;
287 af->get_header_info = ogg_get_header_info;
288 af->chunk_tv.tv_sec = 0;
289 af->chunk_tv.tv_usec = 250 * 1000;
290 tv_scale(3, &af->chunk_tv, &af->eof_tv);
291 af->suffixes = ogg_suffixes;
292 }