The Tor Browser / file comparison

comparison: media/libtremor/lib/tremor_info.c

media/libtremor/lib/tremor_info.c

branch
TOR_BUG_9701
changeset 15
b8a032363ba2
equal deleted inserted replaced
-1:000000000000 0:a8267ce6b459
1 /********************************************************************
2 * *
3 * THIS FILE IS PART OF THE OggVorbis 'TREMOR' CODEC SOURCE CODE. *
4 * *
5 * USE, DISTRIBUTION AND REPRODUCTION OF THIS LIBRARY SOURCE IS *
6 * GOVERNED BY A BSD-STYLE SOURCE LICENSE INCLUDED WITH THIS SOURCE *
7 * IN 'COPYING'. PLEASE READ THESE TERMS BEFORE DISTRIBUTING. *
8 * *
9 * THE OggVorbis 'TREMOR' SOURCE CODE IS (C) COPYRIGHT 1994-2003 *
10 * BY THE Xiph.Org FOUNDATION http://www.xiph.org/ *
11 * *
12 ********************************************************************
13
14 function: maintain the info structure, info <-> header packets
15
16 ********************************************************************/
17
18 /* general handling of the header and the vorbis_info structure (and
19 substructures) */
20
21 #include <stdlib.h>
22 #include <string.h>
23 #include <ctype.h>
24 #include <limits.h>
25 #include <ogg/ogg.h>
26 #include "ivorbiscodec.h"
27 #include "codec_internal.h"
28 #include "codebook.h"
29 #include "registry.h"
30 #include "window.h"
31 #include "misc.h"
32
33 /* helpers */
34 static void _v_readstring(oggpack_buffer *o,char *buf,int bytes){
35 while(bytes--){
36 *buf++=oggpack_read(o,8);
37 }
38 }
39
40 void vorbis_comment_init(vorbis_comment *vc){
41 memset(vc,0,sizeof(*vc));
42 }
43
44 /* This is more or less the same as strncasecmp - but that doesn't exist
45 * everywhere, and this is a fairly trivial function, so we include it */
46 static int tagcompare(const char *s1, const char *s2, int n){
47 int c=0;
48 while(c < n){
49 if(toupper(s1[c]) != toupper(s2[c]))
50 return !0;
51 c++;
52 }
53 return 0;
54 }
55
56 char *vorbis_comment_query(vorbis_comment *vc, char *tag, int count){
57 long i;
58 int found = 0;
59 int taglen = strlen(tag)+1; /* +1 for the = we append */
60 char *fulltag = (char *)alloca(taglen+ 1);
61
62 strcpy(fulltag, tag);
63 strcat(fulltag, "=");
64
65 for(i=0;i<vc->comments;i++){
66 if(!tagcompare(vc->user_comments[i], fulltag, taglen)){
67 if(count == found)
68 /* We return a pointer to the data, not a copy */
69 return vc->user_comments[i] + taglen;
70 else
71 found++;
72 }
73 }
74 return NULL; /* didn't find anything */
75 }
76
77 int vorbis_comment_query_count(vorbis_comment *vc, char *tag){
78 int i,count=0;
79 int taglen = strlen(tag)+1; /* +1 for the = we append */
80 char *fulltag = (char *)alloca(taglen+1);
81 strcpy(fulltag,tag);
82 strcat(fulltag, "=");
83
84 for(i=0;i<vc->comments;i++){
85 if(!tagcompare(vc->user_comments[i], fulltag, taglen))
86 count++;
87 }
88
89 return count;
90 }
91
92 void vorbis_comment_clear(vorbis_comment *vc){
93 if(vc){
94 long i;
95 if(vc->user_comments){
96 for(i=0;i<vc->comments;i++)
97 if(vc->user_comments[i])_ogg_free(vc->user_comments[i]);
98 _ogg_free(vc->user_comments);
99 }
100 if(vc->comment_lengths)_ogg_free(vc->comment_lengths);
101 if(vc->vendor)_ogg_free(vc->vendor);
102 memset(vc,0,sizeof(*vc));
103 }
104 }
105
106 /* blocksize 0 is guaranteed to be short, 1 is guarantted to be long.
107 They may be equal, but short will never ge greater than long */
108 int vorbis_info_blocksize(vorbis_info *vi,int zo){
109 codec_setup_info *ci = (codec_setup_info *)vi->codec_setup;
110 return ci ? ci->blocksizes[zo] : -1;
111 }
112
113 /* used by synthesis, which has a full, alloced vi */
114 void vorbis_info_init(vorbis_info *vi){
115 memset(vi,0,sizeof(*vi));
116 vi->codec_setup=(codec_setup_info *)_ogg_calloc(1,sizeof(codec_setup_info));
117 }
118
119 void vorbis_info_clear(vorbis_info *vi){
120 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
121 int i;
122
123 if(ci){
124
125 for(i=0;i<ci->modes;i++)
126 if(ci->mode_param[i])_ogg_free(ci->mode_param[i]);
127
128 for(i=0;i<ci->maps;i++) /* unpack does the range checking */
129 if(ci->map_param[i])
130 _mapping_P[ci->map_type[i]]->free_info(ci->map_param[i]);
131
132 for(i=0;i<ci->floors;i++) /* unpack does the range checking */
133 if(ci->floor_param[i])
134 _floor_P[ci->floor_type[i]]->free_info(ci->floor_param[i]);
135
136 for(i=0;i<ci->residues;i++) /* unpack does the range checking */
137 if(ci->residue_param[i])
138 _residue_P[ci->residue_type[i]]->free_info(ci->residue_param[i]);
139
140 for(i=0;i<ci->books;i++){
141 if(ci->book_param[i]){
142 /* knows if the book was not alloced */
143 vorbis_staticbook_destroy(ci->book_param[i]);
144 }
145 if(ci->fullbooks)
146 vorbis_book_clear(ci->fullbooks+i);
147 }
148 if(ci->fullbooks)
149 _ogg_free(ci->fullbooks);
150
151 _ogg_free(ci);
152 }
153
154 memset(vi,0,sizeof(*vi));
155 }
156
157 /* Header packing/unpacking ********************************************/
158
159 static int _vorbis_unpack_info(vorbis_info *vi,oggpack_buffer *opb){
160 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
161 if(!ci)return(OV_EFAULT);
162
163 vi->version=oggpack_read(opb,32);
164 if(vi->version!=0)return(OV_EVERSION);
165
166 vi->channels=oggpack_read(opb,8);
167 vi->rate=oggpack_read(opb,32);
168
169 vi->bitrate_upper=oggpack_read(opb,32);
170 vi->bitrate_nominal=oggpack_read(opb,32);
171 vi->bitrate_lower=oggpack_read(opb,32);
172
173 ci->blocksizes[0]=1<<oggpack_read(opb,4);
174 ci->blocksizes[1]=1<<oggpack_read(opb,4);
175
176 if(vi->rate<1)goto err_out;
177 if(vi->channels<1)goto err_out;
178 if(ci->blocksizes[0]<64)goto err_out;
179 if(ci->blocksizes[1]<ci->blocksizes[0])goto err_out;
180 if(ci->blocksizes[1]>8192)goto err_out;
181
182 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
183
184 return(0);
185 err_out:
186 vorbis_info_clear(vi);
187 return(OV_EBADHEADER);
188 }
189
190 static int _vorbis_unpack_comment(vorbis_comment *vc,oggpack_buffer *opb){
191 int i;
192 int vendorlen;
193 vendorlen=oggpack_read(opb,32);
194 if(vendorlen<0)goto err_out;
195 if(vendorlen>opb->storage-oggpack_bytes(opb))goto err_out;
196 vc->vendor=(char *)_ogg_calloc(vendorlen+1,1);
197 if(vc->vendor==NULL)goto err_out;
198 _v_readstring(opb,vc->vendor,vendorlen);
199 i=oggpack_read(opb,32);
200 if(i<0||i>=INT_MAX||i>(opb->storage-oggpack_bytes(opb))>>2)goto err_out;
201 vc->user_comments=(char **)_ogg_calloc(i+1,sizeof(*vc->user_comments));
202 vc->comment_lengths=(int *)_ogg_calloc(i+1, sizeof(*vc->comment_lengths));
203 if(vc->user_comments==NULL||vc->comment_lengths==NULL)goto err_out;
204 vc->comments=i;
205
206 for(i=0;i<vc->comments;i++){
207 int len=oggpack_read(opb,32);
208 if(len<0||len>opb->storage-oggpack_bytes(opb))goto err_out;
209 vc->comment_lengths[i]=len;
210 vc->user_comments[i]=(char *)_ogg_calloc(len+1,1);
211 if(vc->user_comments[i]==NULL){
212 vc->comments=i;
213 goto err_out;
214 }
215 _v_readstring(opb,vc->user_comments[i],len);
216 }
217 if(oggpack_read(opb,1)!=1)goto err_out; /* EOP check */
218
219 return(0);
220 err_out:
221 vorbis_comment_clear(vc);
222 return(OV_EBADHEADER);
223 }
224
225 /* all of the real encoding details are here. The modes, books,
226 everything */
227 static int _vorbis_unpack_books(vorbis_info *vi,oggpack_buffer *opb){
228 codec_setup_info *ci=(codec_setup_info *)vi->codec_setup;
229 int i;
230 if(!ci)return(OV_EFAULT);
231
232 /* codebooks */
233 ci->books=oggpack_read(opb,8)+1;
234 if(ci->books<=0)goto err_out;
235 for(i=0;i<ci->books;i++){
236 ci->book_param[i]=vorbis_staticbook_unpack(opb);
237 if(!ci->book_param[i])goto err_out;
238 }
239
240 /* time backend settings */
241 ci->times=oggpack_read(opb,6)+1;
242 if(ci->times<=0)goto err_out;
243 for(i=0;i<ci->times;i++){
244 ci->time_type[i]=oggpack_read(opb,16);
245 if(ci->time_type[i]<0 || ci->time_type[i]>=VI_TIMEB)goto err_out;
246 /* ci->time_param[i]=_time_P[ci->time_type[i]]->unpack(vi,opb);
247 Vorbis I has no time backend */
248 /*if(!ci->time_param[i])goto err_out;*/
249 }
250
251 /* floor backend settings */
252 ci->floors=oggpack_read(opb,6)+1;
253 if(ci->floors<=0)goto err_out;
254 for(i=0;i<ci->floors;i++){
255 ci->floor_type[i]=oggpack_read(opb,16);
256 if(ci->floor_type[i]<0 || ci->floor_type[i]>=VI_FLOORB)goto err_out;
257 ci->floor_param[i]=_floor_P[ci->floor_type[i]]->unpack(vi,opb);
258 if(!ci->floor_param[i])goto err_out;
259 }
260
261 /* residue backend settings */
262 ci->residues=oggpack_read(opb,6)+1;
263 if(ci->residues<=0)goto err_out;
264 for(i=0;i<ci->residues;i++){
265 ci->residue_type[i]=oggpack_read(opb,16);
266 if(ci->residue_type[i]<0 || ci->residue_type[i]>=VI_RESB)goto err_out;
267 ci->residue_param[i]=_residue_P[ci->residue_type[i]]->unpack(vi,opb);
268 if(!ci->residue_param[i])goto err_out;
269 }
270
271 /* map backend settings */
272 ci->maps=oggpack_read(opb,6)+1;
273 if(ci->maps<=0)goto err_out;
274 for(i=0;i<ci->maps;i++){
275 ci->map_type[i]=oggpack_read(opb,16);
276 if(ci->map_type[i]<0 || ci->map_type[i]>=VI_MAPB)goto err_out;
277 ci->map_param[i]=_mapping_P[ci->map_type[i]]->unpack(vi,opb);
278 if(!ci->map_param[i])goto err_out;
279 }
280
281 /* mode settings */
282 ci->modes=oggpack_read(opb,6)+1;
283 if(ci->modes<=0)goto err_out;
284 for(i=0;i<ci->modes;i++){
285 ci->mode_param[i]=(vorbis_info_mode *)_ogg_calloc(1,sizeof(*ci->mode_param[i]));
286 ci->mode_param[i]->blockflag=oggpack_read(opb,1);
287 ci->mode_param[i]->windowtype=oggpack_read(opb,16);
288 ci->mode_param[i]->transformtype=oggpack_read(opb,16);
289 ci->mode_param[i]->mapping=oggpack_read(opb,8);
290
291 if(ci->mode_param[i]->windowtype>=VI_WINDOWB)goto err_out;
292 if(ci->mode_param[i]->transformtype>=VI_WINDOWB)goto err_out;
293 if(ci->mode_param[i]->mapping>=ci->maps)goto err_out;
294 if(ci->mode_param[i]->mapping<0)goto err_out;
295 }
296
297 if(oggpack_read(opb,1)!=1)goto err_out; /* top level EOP check */
298
299 return(0);
300 err_out:
301 vorbis_info_clear(vi);
302 return(OV_EBADHEADER);
303 }
304
305 /* Is this packet a vorbis ID header? */
306 int vorbis_synthesis_idheader(ogg_packet *op){
307 oggpack_buffer opb;
308 char buffer[6];
309
310 if(op){
311 oggpack_readinit(&opb,op->packet,op->bytes);
312
313 if(!op->b_o_s)
314 return(0); /* Not the initial packet */
315
316 if(oggpack_read(&opb,8) != 1)
317 return 0; /* not an ID header */
318
319 memset(buffer,0,6);
320 _v_readstring(&opb,buffer,6);
321 if(memcmp(buffer,"vorbis",6))
322 return 0; /* not vorbis */
323
324 return 1;
325 }
326
327 return 0;
328 }
329
330 /* The Vorbis header is in three packets; the initial small packet in
331 the first page that identifies basic parameters, a second packet
332 with bitstream comments and a third packet that holds the
333 codebook. */
334
335 int vorbis_synthesis_headerin(vorbis_info *vi,vorbis_comment *vc,ogg_packet *op){
336 oggpack_buffer opb;
337
338 if(op){
339 oggpack_readinit(&opb,op->packet,op->bytes);
340
341 /* Which of the three types of header is this? */
342 /* Also verify header-ness, vorbis */
343 {
344 char buffer[6];
345 int packtype=oggpack_read(&opb,8);
346 memset(buffer,0,6);
347 _v_readstring(&opb,buffer,6);
348 if(memcmp(buffer,"vorbis",6)){
349 /* not a vorbis header */
350 return(OV_ENOTVORBIS);
351 }
352 switch(packtype){
353 case 0x01: /* least significant *bit* is read first */
354 if(!op->b_o_s){
355 /* Not the initial packet */
356 return(OV_EBADHEADER);
357 }
358 if(vi->rate!=0){
359 /* previously initialized info header */
360 return(OV_EBADHEADER);
361 }
362
363 return(_vorbis_unpack_info(vi,&opb));
364
365 case 0x03: /* least significant *bit* is read first */
366 if(vi->rate==0){
367 /* um... we didn't get the initial header */
368 return(OV_EBADHEADER);
369 }
370
371 return(_vorbis_unpack_comment(vc,&opb));
372
373 case 0x05: /* least significant *bit* is read first */
374 if(vi->rate==0 || vc->vendor==NULL){
375 /* um... we didn;t get the initial header or comments yet */
376 return(OV_EBADHEADER);
377 }
378
379 return(_vorbis_unpack_books(vi,&opb));
380
381 default:
382 /* Not a valid vorbis header type */
383 return(OV_EBADHEADER);
384 break;
385 }
386 }
387 }
388 return(OV_EBADHEADER);
389 }
390

Mercurial Repository: The Tor Browser

Europalab SCM Repository Server

mercurial