para_server: Initialize the new afs.
[paraslash.git] / ogg_afh.c
1 /*
2 * Copyright (C) 2004-2007 Andre Noll <maan@systemlinux.org>
3 *
4 * Licensed under the GPL v2. For licencing details see COPYING.
5 */
6 /** \file ogg_afh.c para_server's ogg vorbis audio format handler */
7
8 #include <inttypes.h>
9 #include <ogg/ogg.h>
10 #include <vorbis/codec.h>
11 #include <vorbis/vorbisfile.h>
12
13 #include "para.h"
14 #include "afh.h"
15 #include "server.h"
16 #include "error.h"
17 #include "string.h"
18
19 /** must be big enough to hold header */
20 #define CHUNK_SIZE 32768
21 static double chunk_time = 0.25;
22
23 /** describes a memory-mapped ogg vorbis file */
24 struct ogg_datasource {
25 /** the memory mapping */
26 char *map;
27 /** this size of the mapping */
28 off_t numbytes;
29 /** the current position in the mapping */
30 off_t fpos;
31 };
32
33 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
34 {
35 struct ogg_datasource *ods = datasource;
36 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
37 ret = copy / size;
38 if (!ret)
39 return 0;
40 memcpy(buf, ods->map + ods->fpos, copy);
41 // PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
42 ods->fpos += ret * size;
43 return ret;
44 }
45
46 static int cb_seek(void *datasource, ogg_int64_t offset,
47 int whence)
48 {
49 struct ogg_datasource *ods = datasource;
50 switch (whence) {
51 case SEEK_SET:
52 if (offset >= 0 && offset <= ods->numbytes) {
53 ods->fpos = offset;
54 return 0;
55 }
56 errno = EINVAL;
57 return -1;
58 break;
59 case SEEK_END:
60 if (offset <= 0 && -offset <= ods->numbytes) {
61 ods->fpos = ods->numbytes + offset;
62 return 0;
63 }
64 errno = EINVAL;
65 return -1;
66 break;
67 case SEEK_CUR:
68 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
69 (offset < 0 && offset + ods->fpos < 0)) {
70 errno = EINVAL;
71 return -1;
72 }
73 ods->fpos += offset;
74 return 0;
75 }
76 errno = EINVAL;
77 return -1;
78 }
79
80 /* don't do anything as vss still needs the open filehandle */
81 static int cb_close(__a_unused void *datasource)
82 {
83 return 0;
84 }
85
86 static long cb_tell(void *datasource)
87 {
88 struct ogg_datasource *ods = datasource;
89 return (unsigned long)ods->fpos;
90 }
91
92 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
93 {
94 int ret = ov_open_callbacks(datasource, vf,
95 NULL, /* no initial buffer */
96 0, /* no initial bytes */
97 c); /* the ov_open_callbacks */
98
99 if (ret == OV_EREAD)
100 return -E_OGG_READ;
101 if (ret == OV_ENOTVORBIS)
102 return -E_VORBIS;
103 if (ret == OV_EVERSION)
104 return -E_OGG_VERSION;
105 if (ret == OV_EBADHEADER)
106 return -E_OGG_BAD_HEADER;
107 if (ret < 0)
108 return -E_OGG_UNKNOWN_ERROR;
109 return 1;
110
111 }
112
113 static int ogg_compute_header_len(char *map, size_t numbytes,
114 struct audio_format_info *afi)
115 {
116 int ret;
117 size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
118 int serial;
119 char *buf;
120
121 ogg_page page;
122 ogg_packet packet;
123 vorbis_comment vc;
124 vorbis_info vi;
125 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
126 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
127 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
128
129 ogg_sync_init(sync_in);
130 vorbis_info_init(&vi);
131 vorbis_comment_init(&vc);
132 buf = ogg_sync_buffer(sync_in, (long)len);
133 memcpy(buf, map, len);
134 ogg_sync_wrote(sync_in, (long)len);
135 ret = -E_SYNC_PAGEOUT;
136 if (ogg_sync_pageout(sync_in, &page) <= 0)
137 goto err1;
138 serial = ogg_page_serialno(&page);
139 ogg_stream_init(stream_in, serial);
140 ogg_stream_init(stream_out, serial);
141 ret = ogg_stream_pagein(stream_in, &page);
142 if (ret < 0) {
143 ret = -E_STREAM_PAGEIN;
144 goto err2;
145 }
146 ret = ogg_stream_packetout(stream_in, &packet);
147 if (ret != 1) {
148 ret = -E_STREAM_PACKETOUT;
149 goto err2;
150 }
151 ret = -E_VORBIS;
152 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
153 goto err2;
154 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
155 ogg_stream_packetin(stream_out, &packet);
156
157 ret = ogg_sync_pageout(sync_in, &page);
158 if (ret <= 0) {
159 ret = -E_SYNC_PAGEOUT;
160 goto err2;
161 }
162 ogg_stream_pagein(stream_in, &page);
163 ogg_stream_packetout(stream_in, &packet);
164 ogg_stream_packetin(stream_out, &packet);
165
166 ret = ogg_sync_pageout(sync_in, &page);
167 if (ret <= 0) {
168 ret = -E_SYNC_PAGEOUT;
169 goto err2;
170 }
171 ogg_stream_pagein(stream_in, &page);
172 ogg_stream_packetout(stream_in, &packet);
173 ogg_stream_packetin(stream_out, &packet);
174
175 afi->header_len = 0;
176 while (ogg_stream_flush(stream_out, &page))
177 afi->header_len += page.body_len + page.header_len;
178 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
179 afi->header_offset = 0;
180 ret = 1;
181 err2:
182 ogg_stream_destroy(stream_in);
183 ogg_stream_destroy(stream_out);
184 err1:
185 ogg_sync_destroy(sync_in);
186 vorbis_info_clear(&vi);
187 vorbis_comment_clear(&vc);
188 return ret;
189 }
190
191 /*
192 * Alloc and fill array table of byte offsets. chunk_table[i] is the
193 * offset in the current input file at which the sample containing time i *
194 * CHUNK_TIME begins. Always successful.
195 */
196 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
197 struct audio_format_info *afi, long unsigned time_total)
198 {
199 int i, ret, num;
200 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
201 long unsigned num_chunks;
202
203 old_pos = 0;
204 ret = 0;
205 num = time_total / chunk_time + 3;
206 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
207 chunk_time, num);
208 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
209 afi->chunk_table[0] = 0;
210 max_chunk_len = 0;
211 for (i = 1; ret <= num; i++) {
212 ogg_int64_t diff;
213 ret = ov_time_seek(of, i * chunk_time);
214 if (ret)
215 break;
216 pos = ov_raw_tell(of);
217 diff = pos - old_pos;
218 max_chunk_len = PARA_MAX(max_chunk_len, diff);
219 min = (i == 1)? diff : PARA_MIN(min, diff);
220 afi->chunk_table[i] = pos;
221 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
222 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
223 // "size: %zd\n", i - 1,
224 // i * chunk_time, pos, pos - old_pos);
225 old_pos = pos;
226 }
227 num_chunks = i - 1;
228 //fi->chunk_table[i] = pos;
229 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
230 num_chunks, chunk_time, max_chunk_len, min);
231 return num_chunks;
232 }
233
234 /*
235 * Init oggvorbis file and write some tech data to given pointers.
236 */
237 static int ogg_get_file_info(char *map, size_t numbytes,
238 struct audio_format_info *afi)
239 {
240 int ret;
241 vorbis_info *vi;
242 OggVorbis_File of;
243 const ov_callbacks ovc = {
244 .read_func = cb_read,
245 .seek_func = cb_seek,
246 .close_func = cb_close,
247 .tell_func = cb_tell
248 };
249 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
250
251 ret = ogg_compute_header_len(map, numbytes, afi);
252 if (ret < 0)
253 return ret;
254 ret = ogg_open_callbacks(&ods, &of, ovc);
255 if (ret < 0)
256 goto err;
257 ret = -E_OGG_INFO;
258 vi = ov_info(&of, 0);
259 if (!vi)
260 goto err;
261 afi->seconds_total = ov_time_total(&of, -1);
262 afi->frequency = vi->rate;
263 afi->bitrate = ov_bitrate(&of, 0);
264 afi->channels = vi->channels;
265 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
266 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
267 "%d channels, %ukbps\n"
268 "audio_file_info2: \n"
269 "audio_file_info3: \n",
270 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
271 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
272 );
273 afi->chunk_tv.tv_sec = 0;
274 afi->chunk_tv.tv_usec = 250 * 1000;
275 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
276 ret = 1;
277 err:
278 ov_clear(&of); /* keeps the file open */
279 return ret;
280 }
281
282 static const char* ogg_suffixes[] = {"ogg", NULL};
283
284 /**
285 * the init function of the ogg vorbis audio format handler
286 *
287 * \param afh pointer to the struct to initialize
288 */
289 void ogg_init(struct audio_format_handler *afh)
290 {
291 afh->get_file_info = ogg_get_file_info,
292 afh->suffixes = ogg_suffixes;
293 }