ogg_afh.c: Kill unused vi_bitrate_nominal
[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 static long vi_sampling_rate, vi_bitrate;
43
44 static int ogg_compute_header_len(FILE *file)
45 {
46 int ret, len, in = fileno(file);
47 unsigned int serial;
48 char *buf;
49 ogg_page page;
50 ogg_packet packet;
51 vorbis_comment vc;
52 vorbis_info vi;
53 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
54 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
55 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
56
57 ogg_sync_init(sync_in);
58 vorbis_info_init(&vi);
59 vorbis_comment_init(&vc);
60 buf = ogg_sync_buffer(sync_in, CHUNK_SIZE);
61 len = read(in, buf, CHUNK_SIZE);
62 ret = -E_OGG_READ;
63 if (len <= 0)
64 goto err1;
65 ogg_sync_wrote(sync_in, len);
66 ret = -E_SYNC_PAGEOUT;
67 if (ogg_sync_pageout(sync_in, &page) <= 0)
68 goto err1;
69 serial = ogg_page_serialno(&page);
70 ogg_stream_init(stream_in, serial);
71 ogg_stream_init(stream_out, serial);
72 ret = ogg_stream_pagein(stream_in, &page);
73 if (ret < 0) {
74 ret = E_STREAM_PAGEIN;
75 goto err2;
76 }
77 ret = ogg_stream_packetout(stream_in, &packet);
78 if (ret != 1) {
79 ret = -E_STREAM_PACKETOUT;
80 goto err2;
81 }
82 ret = -E_VORBIS;
83 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
84 goto err2;
85 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
86 ogg_stream_packetin(stream_out, &packet);
87
88 ret = ogg_sync_pageout(sync_in, &page);
89 if (ret <= 0) {
90 ret = -E_SYNC_PAGEOUT;
91 goto err2;
92 }
93 ogg_stream_pagein(stream_in, &page);
94 ogg_stream_packetout(stream_in, &packet);
95 ogg_stream_packetin(stream_out, &packet);
96
97 ret = ogg_sync_pageout(sync_in, &page);
98 if (ret <= 0) {
99 ret = -E_SYNC_PAGEOUT;
100 goto err2;
101 }
102 ogg_stream_pagein(stream_in, &page);
103 ogg_stream_packetout(stream_in, &packet);
104 ogg_stream_packetin(stream_out, &packet);
105
106 header_len = 0;
107 while (ogg_stream_flush(stream_out, &page))
108 header_len += page.body_len + page.header_len;
109 ret = len;
110 PARA_INFO_LOG("header_len = %d\n", header_len);
111 err2:
112 ogg_stream_destroy(stream_in);
113 ogg_stream_destroy(stream_out);
114 err1:
115 ogg_sync_destroy(sync_in);
116 vorbis_info_clear(&vi);
117 vorbis_comment_clear(&vc);
118 return ret;
119 }
120
121 static void tunetable(void)
122 {
123 int i = 1, j = -1, lp = 1;
124 while (i < num_chunks) {
125 if (chunk_table[i] == chunk_table[lp]) {
126 i++;
127 continue;
128 }
129 if (j < 0)
130 tv_scale(i, &af->chunk_tv, &af->eof_tv);
131 for (j = lp; j < i; j++)
132 chunk_table[j] = chunk_table[i];
133 lp = i;
134 }
135 #if 1
136 for (i = 2; i < num_chunks; i++)
137 if (chunk_table[i] != chunk_table[1])
138 break;
139 lp = i;
140 for (i = 2; i < num_chunks - lp; i++)
141 chunk_table[i] = chunk_table[i + lp];
142 #endif
143 }
144
145
146 /*
147 * Alloc and fill array table of byte offsets. chunk_table[i] is the
148 * offset in the current input file at which the sample containing time i *
149 * CHUNK_TIME begins.
150 */
151 static void ogg_compute_chunk_table(double time_total)
152 {
153 int i, ret, num;
154 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
155
156 old_pos = 0;
157 ret = 0;
158 num = time_total / chunk_time + 3;
159 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
160 chunk_time, num);
161 chunk_table = para_malloc(num * sizeof(size_t));
162 chunk_table[0] = 0;
163 max_chunk_len = 0;
164 for (i = 1; ret == 0; i++) {
165 ogg_int64_t diff;
166 ret = ov_time_seek(oggvorbis_file, i * chunk_time);
167 if (ret)
168 break;
169 pos = ov_raw_tell(oggvorbis_file);
170 diff = pos - old_pos;
171 max_chunk_len = PARA_MAX(max_chunk_len, diff);
172 min = (i == 1)? diff : PARA_MIN(min, diff);
173 chunk_table[i] = pos;
174 if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
175 PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
176 "size: %zd\n", i - 1,
177 i * chunk_time, pos, pos - old_pos);
178 old_pos = pos;
179 }
180 num_chunks = i - 1;
181 chunk_table[i] = pos;
182 tunetable();
183 PARA_INFO_LOG("%zu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
184 num_chunks, chunk_time, max_chunk_len, min);
185 }
186
187 static void ogg_close_audio_file(void)
188 {
189 if (oggvorbis_file) {
190 PARA_DEBUG_LOG("%s", "ov_clear\n");
191 ov_clear(oggvorbis_file);
192 free(oggvorbis_file);
193 oggvorbis_file = NULL;
194 }
195 free(header);
196 header = NULL;
197 header_len = 0;
198 free(chunk_table);
199 chunk_table = NULL;
200 num_chunks = 0;
201 }
202
203 static int ogg_save_header(FILE *file, int len)
204 {
205 int ret;
206
207 header = para_malloc(len);
208 rewind(file);
209 ret = read(fileno(file), header, len);
210 if (ret != len)
211 return -E_OGG_READ;
212 return 1;
213 }
214
215 /*
216 * Init oggvorbis file and write some tech data to given pointers.
217 */
218 static int ogg_get_file_info(FILE *file, char *info_str, long unsigned *frames,
219 int *seconds, size_t **vss_chunk_table)
220 {
221 int ret;
222 double time_total;
223 vorbis_info *vi;
224 ogg_int64_t raw_total;
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 }