ogg_afh.c: Fix a memory leak.
[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 free(stream_in);
138 free(stream_out);
139 goto err1;
140 }
141 serial = ogg_page_serialno(&page);
142 ogg_stream_init(stream_in, serial);
143 ogg_stream_init(stream_out, serial);
144 ret = ogg_stream_pagein(stream_in, &page);
145 if (ret < 0) {
146 ret = -E_STREAM_PAGEIN;
147 goto err2;
148 }
149 ret = ogg_stream_packetout(stream_in, &packet);
150 if (ret != 1) {
151 ret = -E_STREAM_PACKETOUT;
152 goto err2;
153 }
154 ret = -E_VORBIS;
155 if (vorbis_synthesis_headerin(&vi, &vc, &packet) < 0)
156 goto err2;
157 PARA_INFO_LOG("channels: %i, rate: %li\n", vi.channels, vi.rate);
158 ogg_stream_packetin(stream_out, &packet);
159
160 ret = ogg_sync_pageout(sync_in, &page);
161 if (ret <= 0) {
162 ret = -E_SYNC_PAGEOUT;
163 goto err2;
164 }
165 ogg_stream_pagein(stream_in, &page);
166 ogg_stream_packetout(stream_in, &packet);
167 ogg_stream_packetin(stream_out, &packet);
168
169 ret = ogg_sync_pageout(sync_in, &page);
170 if (ret <= 0) {
171 ret = -E_SYNC_PAGEOUT;
172 goto err2;
173 }
174 ogg_stream_pagein(stream_in, &page);
175 ogg_stream_packetout(stream_in, &packet);
176 ogg_stream_packetin(stream_out, &packet);
177
178 afi->header_len = 0;
179 while (ogg_stream_flush(stream_out, &page))
180 afi->header_len += page.body_len + page.header_len;
181 PARA_INFO_LOG("header_len = %d\n", afi->header_len);
182 afi->header_offset = 0;
183 ret = 1;
184 err2:
185 ogg_stream_destroy(stream_in);
186 ogg_stream_destroy(stream_out);
187 err1:
188 ogg_sync_destroy(sync_in);
189 vorbis_info_clear(&vi);
190 vorbis_comment_clear(&vc);
191 return ret;
192 }
193
194 /*
195 * Alloc and fill array table of byte offsets. chunk_table[i] is the
196 * offset in the current input file at which the sample containing time i *
197 * CHUNK_TIME begins. Always successful.
198 */
199 static long unsigned ogg_compute_chunk_table(OggVorbis_File *of,
200 struct audio_format_info *afi, long unsigned time_total)
201 {
202 int i, ret, num;
203 ssize_t max_chunk_len, pos = 0, min = 0, old_pos;
204 long unsigned num_chunks;
205
206 old_pos = 0;
207 ret = 0;
208 num = time_total / chunk_time + 3;
209 PARA_DEBUG_LOG("chunk time: %g allocating %d chunk pointers\n",
210 chunk_time, num);
211 afi->chunk_table = para_malloc((num + 1) * sizeof(size_t));
212 afi->chunk_table[0] = 0;
213 max_chunk_len = 0;
214 for (i = 1; ret <= num; i++) {
215 ogg_int64_t diff;
216 ret = ov_time_seek(of, i * chunk_time);
217 if (ret)
218 break;
219 pos = ov_raw_tell(of);
220 diff = pos - old_pos;
221 max_chunk_len = PARA_MAX(max_chunk_len, diff);
222 min = (i == 1)? diff : PARA_MIN(min, diff);
223 afi->chunk_table[i] = pos;
224 // if (i < 11 || !((i - 1) % 1000)|| i > num - 11)
225 // PARA_DEBUG_LOG("chunk #%d: %g secs, pos: %zd, "
226 // "size: %zd\n", i - 1,
227 // i * chunk_time, pos, pos - old_pos);
228 old_pos = pos;
229 }
230 num_chunks = i - 1;
231 //fi->chunk_table[i] = pos;
232 PARA_INFO_LOG("%lu chunks (%fs), max chunk: %zd, min chunk: %zd\n",
233 num_chunks, chunk_time, max_chunk_len, min);
234 return num_chunks;
235 }
236
237 /*
238 * Init oggvorbis file and write some tech data to given pointers.
239 */
240 static int ogg_get_file_info(char *map, size_t numbytes,
241 struct audio_format_info *afi)
242 {
243 int ret;
244 vorbis_info *vi;
245 OggVorbis_File of;
246 const ov_callbacks ovc = {
247 .read_func = cb_read,
248 .seek_func = cb_seek,
249 .close_func = cb_close,
250 .tell_func = cb_tell
251 };
252 struct ogg_datasource ods = {.map = map, .numbytes = numbytes, .fpos = 0};
253
254 ret = ogg_compute_header_len(map, numbytes, afi);
255 if (ret < 0)
256 return ret;
257 ret = ogg_open_callbacks(&ods, &of, ovc);
258 if (ret < 0)
259 goto err;
260 ret = -E_OGG_INFO;
261 vi = ov_info(&of, 0);
262 if (!vi)
263 goto err;
264 afi->seconds_total = ov_time_total(&of, -1);
265 afi->frequency = vi->rate;
266 afi->bitrate = ov_bitrate(&of, 0);
267 afi->channels = vi->channels;
268 afi->chunks_total = ogg_compute_chunk_table(&of, afi, afi->seconds_total);
269 sprintf(afi->info_string, "audio_file_info1:%lu x %lu, %ukHz, "
270 "%d channels, %ukbps\n"
271 "audio_file_info2: \n"
272 "audio_file_info3: \n",
273 afi->chunks_total, (long unsigned) (chunk_time * 1000 * 1000),
274 afi->frequency / 1000, vi->channels, afi->bitrate / 1000
275 );
276 afi->chunk_tv.tv_sec = 0;
277 afi->chunk_tv.tv_usec = 250 * 1000;
278 tv_scale(3, &afi->chunk_tv, &afi->eof_tv);
279 ret = 1;
280 err:
281 ov_clear(&of); /* keeps the file open */
282 return ret;
283 }
284
285 static const char* ogg_suffixes[] = {"ogg", NULL};
286
287 /**
288 * the init function of the ogg vorbis audio format handler
289 *
290 * \param afh pointer to the struct to initialize
291 */
292 void ogg_init(struct audio_format_handler *afh)
293 {
294 afh->get_file_info = ogg_get_file_info,
295 afh->suffixes = ogg_suffixes;
296 }