a9b07a3c676515f610dc678ad06aa5cfcbb06435
[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 "server.h"
14 #include "error.h"
15 #include "string.h"
16
17 /** must be big enough to hold header */
18 #define CHUNK_SIZE 32768
19 static double chunk_time = 0.25;
20
21 /** describes a memory-mapped ogg vorbis file */
22 struct ogg_datasource {
23 /** the memory mapping */
24 char *map;
25 /** this size of the mapping */
26 off_t numbytes;
27 /** the current position in the mapping */
28 off_t fpos;
29 };
30
31 static size_t cb_read(void *buf, size_t size, size_t nmemb, void *datasource)
32 {
33 struct ogg_datasource *ods = datasource;
34 size_t copy = PARA_MIN(ods->numbytes - ods->fpos, size * nmemb),
35 ret = copy / size;
36 if (!ret)
37 return 0;
38 memcpy(buf, ods->map + ods->fpos, copy);
39 // PARA_INFO_LOG("size: %zd, nmemb: %zd, ret: %zd\n", size, nmemb, ret);
40 ods->fpos += ret * size;
41 return ret;
42 }
43
44 static int cb_seek(void *datasource, ogg_int64_t offset,
45 int whence)
46 {
47 struct ogg_datasource *ods = datasource;
48 switch (whence) {
49 case SEEK_SET:
50 if (offset >= 0 && offset <= ods->numbytes) {
51 ods->fpos = offset;
52 return 0;
53 }
54 errno = EINVAL;
55 return -1;
56 break;
57 case SEEK_END:
58 if (offset <= 0 && -offset <= ods->numbytes) {
59 ods->fpos = ods->numbytes + offset;
60 return 0;
61 }
62 errno = EINVAL;
63 return -1;
64 break;
65 case SEEK_CUR:
66 if ((offset >= 0 && offset + ods->fpos > ods->numbytes) ||
67 (offset < 0 && offset + ods->fpos < 0)) {
68 errno = EINVAL;
69 return -1;
70 }
71 ods->fpos += offset;
72 return 0;
73 }
74 errno = EINVAL;
75 return -1;
76 }
77
78 /* don't do anything as vss still needs the open filehandle */
79 static int cb_close(__a_unused void *datasource)
80 {
81 return 0;
82 }
83
84 static long cb_tell(void *datasource)
85 {
86 struct ogg_datasource *ods = datasource;
87 return (unsigned long)ods->fpos;
88 }
89
90 static int ogg_open_callbacks(void *datasource, OggVorbis_File *vf, ov_callbacks c)
91 {
92 int ret = ov_open_callbacks(datasource, vf,
93 NULL, /* no initial buffer */
94 0, /* no initial bytes */
95 c); /* the ov_open_callbacks */
96
97 if (ret == OV_EREAD)
98 return -E_OGG_READ;
99 if (ret == OV_ENOTVORBIS)
100 return -E_VORBIS;
101 if (ret == OV_EVERSION)
102 return -E_OGG_VERSION;
103 if (ret == OV_EBADHEADER)
104 return -E_OGG_BAD_HEADER;
105 if (ret < 0)
106 return -E_OGG_UNKNOWN_ERROR;
107 return 1;
108
109 }
110
111 static int ogg_compute_header_len(char *map, size_t numbytes,
112 struct audio_format_info *afi)
113 {
114 int ret;
115 size_t len = PARA_MIN(numbytes, CHUNK_SIZE);
116 int serial;
117 char *buf;
118
119 ogg_page page;
120 ogg_packet packet;
121 vorbis_comment vc;
122 vorbis_info vi;
123 ogg_stream_state *stream_in = para_malloc(sizeof(ogg_stream_state));
124 ogg_stream_state *stream_out = para_malloc(sizeof(ogg_stream_state));
125 ogg_sync_state *sync_in = para_malloc(sizeof(ogg_sync_state));
126
127 ogg_sync_init(sync_in);
128 vorbis_info_init(&vi);
129 vorbis_comment_init(&vc);
130 buf = ogg_sync_buffer(sync_in, (long)len);
131 memcpy(buf, map, len);
132 ogg_sync_wrote(sync_in, (long)len);
133 ret = -E_SYNC_PAGEOUT;
134 if (ogg_sync_pageout(sync_in, &page) <= 0)
135 goto err1;
136 serial = ogg_page_serialno(&page);
137 ogg_stream_init(stream_in, serial);
138 ogg_stream_init(stream_out, serial);
139 ret = ogg_stream_pagein(stream_in, &page);
140 if (ret < 0) {
141 ret = -E_STREAM_PAGEIN;
142 goto err2;
143 }
144 ret = ogg_stream_packetout(stream_in, &packet);
145 if (ret != 1) {
146 ret = -E_STREAM_PACKETOUT;
147 goto err2;
148 }
149 ret = -E_VORBIS;
150 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
151 goto err2;
152 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
153 ogg_stream_packetin(stream_out, &packet);
154
155 ret = ogg_sync_pageout(sync_in, &page);
156 if (ret <= 0) {
157 ret = -E_SYNC_PAGEOUT;
158 goto err2;
159 }
160 ogg_stream_pagein(stream_in, &page);
161 ogg_stream_packetout(stream_in, &packet);
162 ogg_stream_packetin(stream_out, &packet);
163
164 ret = ogg_sync_pageout(sync_in, &page);
165 if (ret <= 0) {
166 ret = -E_SYNC_PAGEOUT;
167 goto err2;
168 }
169 ogg_stream_pagein(stream_in, &page);
170 ogg_stream_packetout(stream_in, &packet);
171 ogg_stream_packetin(stream_out, &packet);
172
173 afi->header_len = 0;
174 while (ogg_stream_flush(stream_out, &page))
175 afi->header_len += page.body_len + page.header_len;
176 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
177 afi->header_offset = 0;
178 ret = 1;
179 err2:
180 ogg_stream_destroy(stream_in);
181 ogg_stream_destroy(stream_out);
182 err1:
183 ogg_sync_destroy(sync_in);
184 vorbis_info_clear(&vi);
185 vorbis_comment_clear(&vc);
186 return ret;
187 }
188
189 /*
190 * Alloc and fill array table of byte offsets. chunk_table[i] is the
191 * offset in the current input file at which the sample containing time i *
192 * CHUNK_TIME begins. Always successful.
193 */
194 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
195 struct audio_format_info *afi, long unsigned time_total)
196 {
197 int i, ret, num;
198 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
199 long unsigned num_chunks;
200
201 old_pos = 0;
202 ret = 0;
203 num = time_total / chunk_time + 3;
204 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
205 chunk_time, num);
206 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
207 afi->chunk_table[0] = 0;
208 max_chunk_len = 0;
209 for (i = 1; ret <= num; i++) {
210 ogg_int64_t diff;
211 ret = ov_time_seek(of, i * chunk_time);
212 if (ret)
213 break;
214 pos = ov_raw_tell(of);
215 diff = pos - old_pos;
216 max_chunk_len = PARA_MAX(max_chunk_len, diff);
217 min = (i == 1)? diff : PARA_MIN(min, diff);
218 afi->chunk_table[i] = pos;
219 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
220 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
221 // "size: %zd\n", i - 1,
222 // i * chunk_time, pos, pos - old_pos);
223 old_pos = pos;
224 }
225 num_chunks = i - 1;
226 //fi->chunk_table[i] = pos;
227 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
228 num_chunks, chunk_time, max_chunk_len, min);
229 return num_chunks;
230 }
231
232 /*
233 * Init oggvorbis file and write some tech data to given pointers.
234 */
235 static int ogg_get_file_info(char *map, size_t numbytes,
236 struct audio_format_info *afi)
237 {
238 int ret;
239 vorbis_info *vi;
240 OggVorbis_File of;
241 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 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
248
249 ret = ogg_compute_header_len(map, numbytes, afi);
250 if (ret < 0)
251 return ret;
252 ret = ogg_open_callbacks(&ods, &of, ovc);
253 if (ret < 0)
254 goto err;
255 ret = -E_OGG_INFO;
256 vi = ov_info(&of, 0);
257 if (!vi)
258 goto err;
259 afi->seconds_total = ov_time_total(&of, -1);
260 afi->frequency = vi->rate;
261 afi->bitrate = ov_bitrate(&of, 0);
262 afi->channels = vi->channels;
263 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
264 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
265 "%d channels, %ukbps\n"
266 "audio_file_info2: \n"
267 "audio_file_info3: \n",
268 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
269 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
270 );
271 afi->chunk_tv.tv_sec = 0;
272 afi->chunk_tv.tv_usec = 250 * 1000;
273 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
274 ret = 1;
275 err:
276 ov_clear(&of); /* keeps the file open */
277 return ret;
278 }
279
280 static const char* ogg_suffixes[] = {"ogg", NULL};
281
282 /**
283 * the init function of the ogg vorbis audio format handler
284 *
285 * \param afh pointer to the struct to initialize
286 */
287 void ogg_init(struct audio_format_handler *afh)
288 {
289 afh->get_file_info = ogg_get_file_info,
290 afh->suffixes = ogg_suffixes;
291 }