Gloria Wang | 37fe158 | 2010-03-12 14:53:20 -0800 | [diff] [blame] | 1 | /************************************************************************ |
Gloria Wang | 2da723a | 2010-03-18 15:56:16 -0700 | [diff] [blame] | 2 | * Copyright (C) 2002-2009, Xiph.org Foundation |
| 3 | * Copyright (C) 2010, Robin Watts for Pinknoise Productions Ltd |
Gloria Wang | 37fe158 | 2010-03-12 14:53:20 -0800 | [diff] [blame] | 4 | * All rights reserved. |
| 5 | * |
| 6 | * Redistribution and use in source and binary forms, with or without |
Gloria Wang | 2da723a | 2010-03-18 15:56:16 -0700 | [diff] [blame] | 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
Gloria Wang | 37fe158 | 2010-03-12 14:53:20 -0800 | [diff] [blame] | 9 | * |
| 10 | * * Redistributions of source code must retain the above copyright |
| 11 | * notice, this list of conditions and the following disclaimer. |
| 12 | * * Redistributions in binary form must reproduce the above |
| 13 | * copyright notice, this list of conditions and the following disclaimer |
| 14 | * in the documentation and/or other materials provided with the |
| 15 | * distribution. |
Gloria Wang | 2da723a | 2010-03-18 15:56:16 -0700 | [diff] [blame] | 16 | * * Neither the names of the Xiph.org Foundation nor Pinknoise |
| 17 | * Productions Ltd nor the names of its contributors may be used to |
| 18 | * endorse or promote products derived from this software without |
| 19 | * specific prior written permission. |
Gloria Wang | 37fe158 | 2010-03-12 14:53:20 -0800 | [diff] [blame] | 20 | * |
| 21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| 22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| 23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
| 24 | * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT |
| 25 | * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
| 26 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
| 27 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
| 28 | * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
| 29 | * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT |
| 30 | * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| 31 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| 32 | ************************************************************************ |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 33 | |
| 34 | function: decode Ogg streams back into raw packets |
| 35 | |
| 36 | note: The CRC code is directly derived from public domain code by |
| 37 | Ross Williams (ross@guest.adelaide.edu.au). See docs/framing.html |
| 38 | for details. |
| 39 | |
Gloria Wang | 37fe158 | 2010-03-12 14:53:20 -0800 | [diff] [blame] | 40 | ************************************************************************/ |
Gloria Wang | 7913073 | 2010-02-08 14:41:04 -0800 | [diff] [blame] | 41 | |
| 42 | #include <stdlib.h> |
| 43 | #include <string.h> |
| 44 | #include "ogg.h" |
| 45 | #include "misc.h" |
| 46 | |
| 47 | |
| 48 | /* A complete description of Ogg framing exists in docs/framing.html */ |
| 49 | |
| 50 | /* basic, centralized Ogg memory management based on linked lists of |
| 51 | references to refcounted memory buffers. References and buffers |
| 52 | are both recycled. Buffers are passed around and consumed in |
| 53 | reference form. */ |
| 54 | |
| 55 | static ogg_buffer_state *ogg_buffer_create(void){ |
| 56 | ogg_buffer_state *bs=_ogg_calloc(1,sizeof(*bs)); |
| 57 | return bs; |
| 58 | } |
| 59 | |
| 60 | /* destruction is 'lazy'; there may be memory references outstanding, |
| 61 | and yanking the buffer state out from underneath would be |
| 62 | antisocial. Dealloc what is currently unused and have |
| 63 | _release_one watch for the stragglers to come in. When they do, |
| 64 | finish destruction. */ |
| 65 | |
| 66 | /* call the helper while holding lock */ |
| 67 | static void _ogg_buffer_destroy(ogg_buffer_state *bs){ |
| 68 | ogg_buffer *bt; |
| 69 | ogg_reference *rt; |
| 70 | |
| 71 | if(bs->shutdown){ |
| 72 | |
| 73 | bt=bs->unused_buffers; |
| 74 | rt=bs->unused_references; |
| 75 | |
| 76 | while(bt){ |
| 77 | ogg_buffer *b=bt; |
| 78 | bt=b->ptr.next; |
| 79 | if(b->data)_ogg_free(b->data); |
| 80 | _ogg_free(b); |
| 81 | } |
| 82 | bs->unused_buffers=0; |
| 83 | while(rt){ |
| 84 | ogg_reference *r=rt; |
| 85 | rt=r->next; |
| 86 | _ogg_free(r); |
| 87 | } |
| 88 | bs->unused_references=0; |
| 89 | |
| 90 | if(!bs->outstanding) |
| 91 | _ogg_free(bs); |
| 92 | |
| 93 | } |
| 94 | } |
| 95 | |
| 96 | static void ogg_buffer_destroy(ogg_buffer_state *bs){ |
| 97 | bs->shutdown=1; |
| 98 | _ogg_buffer_destroy(bs); |
| 99 | } |
| 100 | |
| 101 | static ogg_buffer *_fetch_buffer(ogg_buffer_state *bs,long bytes){ |
| 102 | ogg_buffer *ob; |
| 103 | bs->outstanding++; |
| 104 | |
| 105 | /* do we have an unused buffer sitting in the pool? */ |
| 106 | if(bs->unused_buffers){ |
| 107 | ob=bs->unused_buffers; |
| 108 | bs->unused_buffers=ob->ptr.next; |
| 109 | |
| 110 | /* if the unused buffer is too small, grow it */ |
| 111 | if(ob->size<bytes){ |
| 112 | ob->data=_ogg_realloc(ob->data,bytes); |
| 113 | ob->size=bytes; |
| 114 | } |
| 115 | }else{ |
| 116 | /* allocate a new buffer */ |
| 117 | ob=_ogg_malloc(sizeof(*ob)); |
| 118 | ob->data=_ogg_malloc(bytes<16?16:bytes); |
| 119 | ob->size=bytes; |
| 120 | } |
| 121 | |
| 122 | ob->refcount=1; |
| 123 | ob->ptr.owner=bs; |
| 124 | return ob; |
| 125 | } |
| 126 | |
| 127 | static ogg_reference *_fetch_ref(ogg_buffer_state *bs){ |
| 128 | ogg_reference *or; |
| 129 | bs->outstanding++; |
| 130 | |
| 131 | /* do we have an unused reference sitting in the pool? */ |
| 132 | if(bs->unused_references){ |
| 133 | or=bs->unused_references; |
| 134 | bs->unused_references=or->next; |
| 135 | }else{ |
| 136 | /* allocate a new reference */ |
| 137 | or=_ogg_malloc(sizeof(*or)); |
| 138 | } |
| 139 | |
| 140 | or->begin=0; |
| 141 | or->length=0; |
| 142 | or->next=0; |
| 143 | return or; |
| 144 | } |
| 145 | |
| 146 | /* fetch a reference pointing to a fresh, initially continguous buffer |
| 147 | of at least [bytes] length */ |
| 148 | static ogg_reference *ogg_buffer_alloc(ogg_buffer_state *bs,long bytes){ |
| 149 | ogg_buffer *ob=_fetch_buffer(bs,bytes); |
| 150 | ogg_reference *or=_fetch_ref(bs); |
| 151 | or->buffer=ob; |
| 152 | return or; |
| 153 | } |
| 154 | |
| 155 | /* enlarge the data buffer in the current link */ |
| 156 | static void ogg_buffer_realloc(ogg_reference *or,long bytes){ |
| 157 | ogg_buffer *ob=or->buffer; |
| 158 | |
| 159 | /* if the unused buffer is too small, grow it */ |
| 160 | if(ob->size<bytes){ |
| 161 | ob->data=_ogg_realloc(ob->data,bytes); |
| 162 | ob->size=bytes; |
| 163 | } |
| 164 | } |
| 165 | |
| 166 | static void _ogg_buffer_mark_one(ogg_reference *or){ |
| 167 | or->buffer->refcount++; |
| 168 | } |
| 169 | |
| 170 | /* increase the refcount of the buffers to which the reference points */ |
| 171 | static void ogg_buffer_mark(ogg_reference *or){ |
| 172 | while(or){ |
| 173 | _ogg_buffer_mark_one(or); |
| 174 | or=or->next; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* duplicate a reference (pointing to the same actual buffer memory) |
| 179 | and increment buffer refcount. If the desired segment is zero |
| 180 | length, a zero length ref is returned. */ |
| 181 | static ogg_reference *ogg_buffer_sub(ogg_reference *or,long length){ |
| 182 | ogg_reference *ret=0,*head=0; |
| 183 | |
| 184 | /* duplicate the reference chain; increment refcounts */ |
| 185 | while(or && length){ |
| 186 | ogg_reference *temp=_fetch_ref(or->buffer->ptr.owner); |
| 187 | if(head) |
| 188 | head->next=temp; |
| 189 | else |
| 190 | ret=temp; |
| 191 | head=temp; |
| 192 | head->buffer=or->buffer; |
| 193 | head->begin=or->begin; |
| 194 | head->length=length; |
| 195 | if(head->length>or->length) |
| 196 | head->length=or->length; |
| 197 | |
| 198 | length-=head->length; |
| 199 | or=or->next; |
| 200 | } |
| 201 | |
| 202 | ogg_buffer_mark(ret); |
| 203 | return ret; |
| 204 | } |
| 205 | |
| 206 | ogg_reference *ogg_buffer_dup(ogg_reference *or){ |
| 207 | ogg_reference *ret=0,*head=0; |
| 208 | /* duplicate the reference chain; increment refcounts */ |
| 209 | while(or){ |
| 210 | ogg_reference *temp=_fetch_ref(or->buffer->ptr.owner); |
| 211 | if(head) |
| 212 | head->next=temp; |
| 213 | else |
| 214 | ret=temp; |
| 215 | head=temp; |
| 216 | head->buffer=or->buffer; |
| 217 | head->begin=or->begin; |
| 218 | head->length=or->length; |
| 219 | or=or->next; |
| 220 | } |
| 221 | |
| 222 | ogg_buffer_mark(ret); |
| 223 | return ret; |
| 224 | } |
| 225 | |
| 226 | /* split a reference into two references; 'return' is a reference to |
| 227 | the buffer preceeding pos and 'head'/'tail' are the buffer past the |
| 228 | split. If pos is at or past the end of the passed in segment, |
| 229 | 'head/tail' are NULL */ |
| 230 | static ogg_reference *ogg_buffer_split(ogg_reference **tail, |
| 231 | ogg_reference **head,long pos){ |
| 232 | |
| 233 | /* walk past any preceeding fragments to one of: |
| 234 | a) the exact boundary that seps two fragments |
| 235 | b) the fragment that needs split somewhere in the middle */ |
| 236 | ogg_reference *ret=*tail; |
| 237 | ogg_reference *or=*tail; |
| 238 | |
| 239 | while(or && pos>or->length){ |
| 240 | pos-=or->length; |
| 241 | or=or->next; |
| 242 | } |
| 243 | |
| 244 | if(!or || pos==0){ |
| 245 | |
| 246 | return 0; |
| 247 | |
| 248 | }else{ |
| 249 | |
| 250 | if(pos>=or->length){ |
| 251 | /* exact split, or off the end? */ |
| 252 | if(or->next){ |
| 253 | |
| 254 | /* a split */ |
| 255 | *tail=or->next; |
| 256 | or->next=0; |
| 257 | |
| 258 | }else{ |
| 259 | |
| 260 | /* off or at the end */ |
| 261 | *tail=*head=0; |
| 262 | |
| 263 | } |
| 264 | }else{ |
| 265 | |
| 266 | /* split within a fragment */ |
| 267 | long lengthA=pos; |
| 268 | long beginB=or->begin+pos; |
| 269 | long lengthB=or->length-pos; |
| 270 | |
| 271 | /* make a new reference to tail the second piece */ |
| 272 | *tail=_fetch_ref(or->buffer->ptr.owner); |
| 273 | |
| 274 | (*tail)->buffer=or->buffer; |
| 275 | (*tail)->begin=beginB; |
| 276 | (*tail)->length=lengthB; |
| 277 | (*tail)->next=or->next; |
| 278 | _ogg_buffer_mark_one(*tail); |
| 279 | if(head && or==*head)*head=*tail; |
| 280 | |
| 281 | /* update the first piece */ |
| 282 | or->next=0; |
| 283 | or->length=lengthA; |
| 284 | |
| 285 | } |
| 286 | } |
| 287 | return ret; |
| 288 | } |
| 289 | |
| 290 | static void ogg_buffer_release_one(ogg_reference *or){ |
| 291 | ogg_buffer *ob=or->buffer; |
| 292 | ogg_buffer_state *bs=ob->ptr.owner; |
| 293 | |
| 294 | ob->refcount--; |
| 295 | if(ob->refcount==0){ |
| 296 | bs->outstanding--; /* for the returned buffer */ |
| 297 | ob->ptr.next=bs->unused_buffers; |
| 298 | bs->unused_buffers=ob; |
| 299 | } |
| 300 | |
| 301 | bs->outstanding--; /* for the returned reference */ |
| 302 | or->next=bs->unused_references; |
| 303 | bs->unused_references=or; |
| 304 | |
| 305 | _ogg_buffer_destroy(bs); /* lazy cleanup (if needed) */ |
| 306 | |
| 307 | } |
| 308 | |
| 309 | /* release the references, decrease the refcounts of buffers to which |
| 310 | they point, release any buffers with a refcount that drops to zero */ |
| 311 | static void ogg_buffer_release(ogg_reference *or){ |
| 312 | while(or){ |
| 313 | ogg_reference *next=or->next; |
| 314 | ogg_buffer_release_one(or); |
| 315 | or=next; |
| 316 | } |
| 317 | } |
| 318 | |
| 319 | static ogg_reference *ogg_buffer_pretruncate(ogg_reference *or,long pos){ |
| 320 | /* release preceeding fragments we don't want */ |
| 321 | while(or && pos>=or->length){ |
| 322 | ogg_reference *next=or->next; |
| 323 | pos-=or->length; |
| 324 | ogg_buffer_release_one(or); |
| 325 | or=next; |
| 326 | } |
| 327 | if (or) { |
| 328 | or->begin+=pos; |
| 329 | or->length-=pos; |
| 330 | } |
| 331 | return or; |
| 332 | } |
| 333 | |
| 334 | static ogg_reference *ogg_buffer_walk(ogg_reference *or){ |
| 335 | if(!or)return NULL; |
| 336 | while(or->next){ |
| 337 | or=or->next; |
| 338 | } |
| 339 | return(or); |
| 340 | } |
| 341 | |
| 342 | /* *head is appended to the front end (head) of *tail; both continue to |
| 343 | be valid pointers, with *tail at the tail and *head at the head */ |
| 344 | static ogg_reference *ogg_buffer_cat(ogg_reference *tail, ogg_reference *head){ |
| 345 | if(!tail)return head; |
| 346 | |
| 347 | while(tail->next){ |
| 348 | tail=tail->next; |
| 349 | } |
| 350 | tail->next=head; |
| 351 | return ogg_buffer_walk(head); |
| 352 | } |
| 353 | |
| 354 | static void _positionB(oggbyte_buffer *b,int pos){ |
| 355 | if(pos<b->pos){ |
| 356 | /* start at beginning, scan forward */ |
| 357 | b->ref=b->baseref; |
| 358 | b->pos=0; |
| 359 | b->end=b->pos+b->ref->length; |
| 360 | b->ptr=b->ref->buffer->data+b->ref->begin; |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | static void _positionF(oggbyte_buffer *b,int pos){ |
| 365 | /* scan forward for position */ |
| 366 | while(pos>=b->end){ |
| 367 | /* just seek forward */ |
| 368 | b->pos+=b->ref->length; |
| 369 | b->ref=b->ref->next; |
| 370 | b->end=b->ref->length+b->pos; |
| 371 | b->ptr=b->ref->buffer->data+b->ref->begin; |
| 372 | } |
| 373 | } |
| 374 | |
| 375 | static int oggbyte_init(oggbyte_buffer *b,ogg_reference *or){ |
| 376 | memset(b,0,sizeof(*b)); |
| 377 | if(or){ |
| 378 | b->ref=b->baseref=or; |
| 379 | b->pos=0; |
| 380 | b->end=b->ref->length; |
| 381 | b->ptr=b->ref->buffer->data+b->ref->begin; |
| 382 | return 0; |
| 383 | }else |
| 384 | return -1; |
| 385 | } |
| 386 | |
| 387 | static void oggbyte_set4(oggbyte_buffer *b,ogg_uint32_t val,int pos){ |
| 388 | int i; |
| 389 | _positionB(b,pos); |
| 390 | for(i=0;i<4;i++){ |
| 391 | _positionF(b,pos); |
| 392 | b->ptr[pos-b->pos]=val; |
| 393 | val>>=8; |
| 394 | ++pos; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | static unsigned char oggbyte_read1(oggbyte_buffer *b,int pos){ |
| 399 | _positionB(b,pos); |
| 400 | _positionF(b,pos); |
| 401 | return b->ptr[pos-b->pos]; |
| 402 | } |
| 403 | |
| 404 | static ogg_uint32_t oggbyte_read4(oggbyte_buffer *b,int pos){ |
| 405 | ogg_uint32_t ret; |
| 406 | _positionB(b,pos); |
| 407 | _positionF(b,pos); |
| 408 | ret=b->ptr[pos-b->pos]; |
| 409 | _positionF(b,++pos); |
| 410 | ret|=b->ptr[pos-b->pos]<<8; |
| 411 | _positionF(b,++pos); |
| 412 | ret|=b->ptr[pos-b->pos]<<16; |
| 413 | _positionF(b,++pos); |
| 414 | ret|=b->ptr[pos-b->pos]<<24; |
| 415 | return ret; |
| 416 | } |
| 417 | |
| 418 | static ogg_int64_t oggbyte_read8(oggbyte_buffer *b,int pos){ |
| 419 | ogg_int64_t ret; |
| 420 | unsigned char t[7]; |
| 421 | int i; |
| 422 | _positionB(b,pos); |
| 423 | for(i=0;i<7;i++){ |
| 424 | _positionF(b,pos); |
| 425 | t[i]=b->ptr[pos++ -b->pos]; |
| 426 | } |
| 427 | |
| 428 | _positionF(b,pos); |
| 429 | ret=b->ptr[pos-b->pos]; |
| 430 | |
| 431 | for(i=6;i>=0;--i) |
| 432 | ret= ret<<8 | t[i]; |
| 433 | |
| 434 | return ret; |
| 435 | } |
| 436 | |
| 437 | /* Now we get to the actual framing code */ |
| 438 | |
| 439 | int ogg_page_version(ogg_page *og){ |
| 440 | oggbyte_buffer ob; |
| 441 | if(oggbyte_init(&ob,og->header))return -1; |
| 442 | return oggbyte_read1(&ob,4); |
| 443 | } |
| 444 | |
| 445 | int ogg_page_continued(ogg_page *og){ |
| 446 | oggbyte_buffer ob; |
| 447 | if(oggbyte_init(&ob,og->header))return -1; |
| 448 | return oggbyte_read1(&ob,5)&0x01; |
| 449 | } |
| 450 | |
| 451 | int ogg_page_bos(ogg_page *og){ |
| 452 | oggbyte_buffer ob; |
| 453 | if(oggbyte_init(&ob,og->header))return -1; |
| 454 | return oggbyte_read1(&ob,5)&0x02; |
| 455 | } |
| 456 | |
| 457 | int ogg_page_eos(ogg_page *og){ |
| 458 | oggbyte_buffer ob; |
| 459 | if(oggbyte_init(&ob,og->header))return -1; |
| 460 | return oggbyte_read1(&ob,5)&0x04; |
| 461 | } |
| 462 | |
| 463 | ogg_int64_t ogg_page_granulepos(ogg_page *og){ |
| 464 | oggbyte_buffer ob; |
| 465 | if(oggbyte_init(&ob,og->header))return -1; |
| 466 | return oggbyte_read8(&ob,6); |
| 467 | } |
| 468 | |
| 469 | ogg_uint32_t ogg_page_serialno(ogg_page *og){ |
| 470 | oggbyte_buffer ob; |
| 471 | if(oggbyte_init(&ob,og->header)) return 0xffffffffUL; |
| 472 | return oggbyte_read4(&ob,14); |
| 473 | } |
| 474 | |
| 475 | ogg_uint32_t ogg_page_pageno(ogg_page *og){ |
| 476 | oggbyte_buffer ob; |
| 477 | if(oggbyte_init(&ob,og->header))return 0xffffffffUL; |
| 478 | return oggbyte_read4(&ob,18); |
| 479 | } |
| 480 | |
| 481 | /* returns the number of packets that are completed on this page (if |
| 482 | the leading packet is begun on a previous page, but ends on this |
| 483 | page, it's counted */ |
| 484 | |
| 485 | /* NOTE: |
| 486 | If a page consists of a packet begun on a previous page, and a new |
| 487 | packet begun (but not completed) on this page, the return will be: |
| 488 | ogg_page_packets(page) ==1, |
| 489 | ogg_page_continued(page) !=0 |
| 490 | |
| 491 | If a page happens to be a single packet that was begun on a |
| 492 | previous page, and spans to the next page (in the case of a three or |
| 493 | more page packet), the return will be: |
| 494 | ogg_page_packets(page) ==0, |
| 495 | ogg_page_continued(page) !=0 |
| 496 | */ |
| 497 | |
| 498 | int ogg_page_packets(ogg_page *og){ |
| 499 | int i; |
| 500 | int n; |
| 501 | int count=0; |
| 502 | oggbyte_buffer ob; |
| 503 | oggbyte_init(&ob,og->header); |
| 504 | |
| 505 | n=oggbyte_read1(&ob,26); |
| 506 | for(i=0;i<n;i++) |
| 507 | if(oggbyte_read1(&ob,27+i)<255)count++; |
| 508 | return(count); |
| 509 | } |
| 510 | |
| 511 | /* Static CRC calculation table. See older code in CVS for dead |
| 512 | run-time initialization code. */ |
| 513 | |
| 514 | ogg_uint32_t crc_lookup[256]={ |
| 515 | 0x00000000,0x04c11db7,0x09823b6e,0x0d4326d9, |
| 516 | 0x130476dc,0x17c56b6b,0x1a864db2,0x1e475005, |
| 517 | 0x2608edb8,0x22c9f00f,0x2f8ad6d6,0x2b4bcb61, |
| 518 | 0x350c9b64,0x31cd86d3,0x3c8ea00a,0x384fbdbd, |
| 519 | 0x4c11db70,0x48d0c6c7,0x4593e01e,0x4152fda9, |
| 520 | 0x5f15adac,0x5bd4b01b,0x569796c2,0x52568b75, |
| 521 | 0x6a1936c8,0x6ed82b7f,0x639b0da6,0x675a1011, |
| 522 | 0x791d4014,0x7ddc5da3,0x709f7b7a,0x745e66cd, |
| 523 | 0x9823b6e0,0x9ce2ab57,0x91a18d8e,0x95609039, |
| 524 | 0x8b27c03c,0x8fe6dd8b,0x82a5fb52,0x8664e6e5, |
| 525 | 0xbe2b5b58,0xbaea46ef,0xb7a96036,0xb3687d81, |
| 526 | 0xad2f2d84,0xa9ee3033,0xa4ad16ea,0xa06c0b5d, |
| 527 | 0xd4326d90,0xd0f37027,0xddb056fe,0xd9714b49, |
| 528 | 0xc7361b4c,0xc3f706fb,0xceb42022,0xca753d95, |
| 529 | 0xf23a8028,0xf6fb9d9f,0xfbb8bb46,0xff79a6f1, |
| 530 | 0xe13ef6f4,0xe5ffeb43,0xe8bccd9a,0xec7dd02d, |
| 531 | 0x34867077,0x30476dc0,0x3d044b19,0x39c556ae, |
| 532 | 0x278206ab,0x23431b1c,0x2e003dc5,0x2ac12072, |
| 533 | 0x128e9dcf,0x164f8078,0x1b0ca6a1,0x1fcdbb16, |
| 534 | 0x018aeb13,0x054bf6a4,0x0808d07d,0x0cc9cdca, |
| 535 | 0x7897ab07,0x7c56b6b0,0x71159069,0x75d48dde, |
| 536 | 0x6b93dddb,0x6f52c06c,0x6211e6b5,0x66d0fb02, |
| 537 | 0x5e9f46bf,0x5a5e5b08,0x571d7dd1,0x53dc6066, |
| 538 | 0x4d9b3063,0x495a2dd4,0x44190b0d,0x40d816ba, |
| 539 | 0xaca5c697,0xa864db20,0xa527fdf9,0xa1e6e04e, |
| 540 | 0xbfa1b04b,0xbb60adfc,0xb6238b25,0xb2e29692, |
| 541 | 0x8aad2b2f,0x8e6c3698,0x832f1041,0x87ee0df6, |
| 542 | 0x99a95df3,0x9d684044,0x902b669d,0x94ea7b2a, |
| 543 | 0xe0b41de7,0xe4750050,0xe9362689,0xedf73b3e, |
| 544 | 0xf3b06b3b,0xf771768c,0xfa325055,0xfef34de2, |
| 545 | 0xc6bcf05f,0xc27dede8,0xcf3ecb31,0xcbffd686, |
| 546 | 0xd5b88683,0xd1799b34,0xdc3abded,0xd8fba05a, |
| 547 | 0x690ce0ee,0x6dcdfd59,0x608edb80,0x644fc637, |
| 548 | 0x7a089632,0x7ec98b85,0x738aad5c,0x774bb0eb, |
| 549 | 0x4f040d56,0x4bc510e1,0x46863638,0x42472b8f, |
| 550 | 0x5c007b8a,0x58c1663d,0x558240e4,0x51435d53, |
| 551 | 0x251d3b9e,0x21dc2629,0x2c9f00f0,0x285e1d47, |
| 552 | 0x36194d42,0x32d850f5,0x3f9b762c,0x3b5a6b9b, |
| 553 | 0x0315d626,0x07d4cb91,0x0a97ed48,0x0e56f0ff, |
| 554 | 0x1011a0fa,0x14d0bd4d,0x19939b94,0x1d528623, |
| 555 | 0xf12f560e,0xf5ee4bb9,0xf8ad6d60,0xfc6c70d7, |
| 556 | 0xe22b20d2,0xe6ea3d65,0xeba91bbc,0xef68060b, |
| 557 | 0xd727bbb6,0xd3e6a601,0xdea580d8,0xda649d6f, |
| 558 | 0xc423cd6a,0xc0e2d0dd,0xcda1f604,0xc960ebb3, |
| 559 | 0xbd3e8d7e,0xb9ff90c9,0xb4bcb610,0xb07daba7, |
| 560 | 0xae3afba2,0xaafbe615,0xa7b8c0cc,0xa379dd7b, |
| 561 | 0x9b3660c6,0x9ff77d71,0x92b45ba8,0x9675461f, |
| 562 | 0x8832161a,0x8cf30bad,0x81b02d74,0x857130c3, |
| 563 | 0x5d8a9099,0x594b8d2e,0x5408abf7,0x50c9b640, |
| 564 | 0x4e8ee645,0x4a4ffbf2,0x470cdd2b,0x43cdc09c, |
| 565 | 0x7b827d21,0x7f436096,0x7200464f,0x76c15bf8, |
| 566 | 0x68860bfd,0x6c47164a,0x61043093,0x65c52d24, |
| 567 | 0x119b4be9,0x155a565e,0x18197087,0x1cd86d30, |
| 568 | 0x029f3d35,0x065e2082,0x0b1d065b,0x0fdc1bec, |
| 569 | 0x3793a651,0x3352bbe6,0x3e119d3f,0x3ad08088, |
| 570 | 0x2497d08d,0x2056cd3a,0x2d15ebe3,0x29d4f654, |
| 571 | 0xc5a92679,0xc1683bce,0xcc2b1d17,0xc8ea00a0, |
| 572 | 0xd6ad50a5,0xd26c4d12,0xdf2f6bcb,0xdbee767c, |
| 573 | 0xe3a1cbc1,0xe760d676,0xea23f0af,0xeee2ed18, |
| 574 | 0xf0a5bd1d,0xf464a0aa,0xf9278673,0xfde69bc4, |
| 575 | 0x89b8fd09,0x8d79e0be,0x803ac667,0x84fbdbd0, |
| 576 | 0x9abc8bd5,0x9e7d9662,0x933eb0bb,0x97ffad0c, |
| 577 | 0xafb010b1,0xab710d06,0xa6322bdf,0xa2f33668, |
| 578 | 0xbcb4666d,0xb8757bda,0xb5365d03,0xb1f740b4}; |
| 579 | |
| 580 | void ogg_sync_init(ogg_sync_state *oy){ |
| 581 | memset(oy,0,sizeof(*oy)); |
| 582 | oy->bufferpool=ogg_buffer_create(); |
| 583 | } |
| 584 | |
| 585 | ogg_sync_state *ogg_sync_create(void){ |
| 586 | ogg_sync_state *oy=_ogg_calloc(1,sizeof(*oy)); |
| 587 | memset(oy,0,sizeof(*oy)); |
| 588 | oy->bufferpool=ogg_buffer_create(); |
| 589 | return oy; |
| 590 | } |
| 591 | |
| 592 | int ogg_sync_clear(ogg_sync_state *oy){ |
| 593 | if(oy){ |
| 594 | ogg_sync_reset(oy); |
| 595 | ogg_buffer_destroy(oy->bufferpool); |
| 596 | memset(oy,0,sizeof(*oy)); |
| 597 | } |
| 598 | return OGG_SUCCESS; |
| 599 | } |
| 600 | |
| 601 | int ogg_sync_destroy(ogg_sync_state *oy){ |
| 602 | if(oy){ |
| 603 | ogg_sync_reset(oy); |
| 604 | ogg_buffer_destroy(oy->bufferpool); |
| 605 | memset(oy,0,sizeof(*oy)); |
| 606 | _ogg_free(oy); |
| 607 | } |
| 608 | return OGG_SUCCESS; |
| 609 | } |
| 610 | |
| 611 | unsigned char *ogg_sync_bufferin(ogg_sync_state *oy, long bytes){ |
| 612 | |
| 613 | /* [allocate and] expose a buffer for data submission. |
| 614 | |
| 615 | If there is no head fragment |
| 616 | allocate one and expose it |
| 617 | else |
| 618 | if the current head fragment has sufficient unused space |
| 619 | expose it |
| 620 | else |
| 621 | if the current head fragment is unused |
| 622 | resize and expose it |
| 623 | else |
| 624 | allocate new fragment and expose it |
| 625 | */ |
| 626 | |
| 627 | /* base case; fifo uninitialized */ |
| 628 | if(!oy->fifo_head){ |
| 629 | oy->fifo_head=oy->fifo_tail=ogg_buffer_alloc(oy->bufferpool,bytes); |
| 630 | return oy->fifo_head->buffer->data; |
| 631 | } |
| 632 | |
| 633 | /* space left in current fragment case */ |
| 634 | if(oy->fifo_head->buffer->size- |
| 635 | oy->fifo_head->length- |
| 636 | oy->fifo_head->begin >= bytes) |
| 637 | return oy->fifo_head->buffer->data+ |
| 638 | oy->fifo_head->length+oy->fifo_head->begin; |
| 639 | |
| 640 | /* current fragment is unused, but too small */ |
| 641 | if(!oy->fifo_head->length){ |
| 642 | ogg_buffer_realloc(oy->fifo_head,bytes); |
| 643 | return oy->fifo_head->buffer->data+oy->fifo_head->begin; |
| 644 | } |
| 645 | |
| 646 | /* current fragment used/full; get new fragment */ |
| 647 | { |
| 648 | ogg_reference *new=ogg_buffer_alloc(oy->bufferpool,bytes); |
| 649 | oy->fifo_head->next=new; |
| 650 | oy->fifo_head=new; |
| 651 | } |
| 652 | return oy->fifo_head->buffer->data; |
| 653 | } |
| 654 | |
| 655 | int ogg_sync_wrote(ogg_sync_state *oy, long bytes){ |
| 656 | if(!oy->fifo_head)return OGG_EINVAL; |
| 657 | if(oy->fifo_head->buffer->size-oy->fifo_head->length-oy->fifo_head->begin < |
| 658 | bytes)return OGG_EINVAL; |
| 659 | oy->fifo_head->length+=bytes; |
| 660 | oy->fifo_fill+=bytes; |
| 661 | return OGG_SUCCESS; |
| 662 | } |
| 663 | |
| 664 | #ifndef ONLY_C |
| 665 | ogg_uint32_t _checksum(ogg_reference *or, int bytes); |
| 666 | #else |
| 667 | static ogg_uint32_t _checksum(ogg_reference *or, int bytes){ |
| 668 | ogg_uint32_t crc_reg=0; |
| 669 | int j,post; |
| 670 | |
| 671 | while(or){ |
| 672 | unsigned char *data=or->buffer->data+or->begin; |
| 673 | post=(bytes<or->length?bytes:or->length); |
| 674 | for(j=0;j<post;++j) |
| 675 | crc_reg=(crc_reg<<8)^crc_lookup[((crc_reg >> 24)&0xff)^data[j]]; |
| 676 | bytes-=j; |
| 677 | or=or->next; |
| 678 | } |
| 679 | |
| 680 | return crc_reg; |
| 681 | } |
| 682 | #endif |
| 683 | |
| 684 | /* sync the stream. This is meant to be useful for finding page |
| 685 | boundaries. |
| 686 | |
| 687 | return values for this: |
| 688 | -n) skipped n bytes |
| 689 | 0) page not ready; more data (no bytes skipped) |
| 690 | n) page synced at current location; page length n bytes |
| 691 | |
| 692 | */ |
| 693 | |
| 694 | long ogg_sync_pageseek(ogg_sync_state *oy,ogg_page *og){ |
| 695 | oggbyte_buffer page; |
| 696 | long bytes,ret=0; |
| 697 | |
| 698 | ogg_page_release(og); |
| 699 | |
| 700 | bytes=oy->fifo_fill; |
| 701 | oggbyte_init(&page,oy->fifo_tail); |
| 702 | |
| 703 | if(oy->headerbytes==0){ |
| 704 | if(bytes<27)goto sync_out; /* not enough for even a minimal header */ |
| 705 | |
| 706 | /* verify capture pattern */ |
| 707 | if(oggbyte_read1(&page,0)!=(int)'O' || |
| 708 | oggbyte_read1(&page,1)!=(int)'g' || |
| 709 | oggbyte_read1(&page,2)!=(int)'g' || |
| 710 | oggbyte_read1(&page,3)!=(int)'S' ) goto sync_fail; |
| 711 | |
| 712 | oy->headerbytes=oggbyte_read1(&page,26)+27; |
| 713 | } |
| 714 | if(bytes<oy->headerbytes)goto sync_out; /* not enough for header + |
| 715 | seg table */ |
| 716 | if(oy->bodybytes==0){ |
| 717 | int i; |
| 718 | /* count up body length in the segment table */ |
| 719 | for(i=0;i<oy->headerbytes-27;i++) |
| 720 | oy->bodybytes+=oggbyte_read1(&page,27+i); |
| 721 | } |
| 722 | |
| 723 | if(oy->bodybytes+oy->headerbytes>bytes)goto sync_out; |
| 724 | |
| 725 | /* we have what appears to be a complete page; last test: verify |
| 726 | checksum */ |
| 727 | { |
| 728 | ogg_uint32_t chksum=oggbyte_read4(&page,22); |
| 729 | oggbyte_set4(&page,0,22); |
| 730 | |
| 731 | /* Compare checksums; memory continues to be common access */ |
| 732 | if(chksum!=_checksum(oy->fifo_tail,oy->bodybytes+oy->headerbytes)){ |
| 733 | |
| 734 | /* D'oh. Mismatch! Corrupt page (or miscapture and not a page |
| 735 | at all). replace the computed checksum with the one actually |
| 736 | read in; remember all the memory is common access */ |
| 737 | |
| 738 | oggbyte_set4(&page,chksum,22); |
| 739 | goto sync_fail; |
| 740 | } |
| 741 | oggbyte_set4(&page,chksum,22); |
| 742 | } |
| 743 | |
| 744 | /* We have a page. Set up page return. */ |
| 745 | if(og){ |
| 746 | /* set up page output */ |
| 747 | og->header=ogg_buffer_split(&oy->fifo_tail,&oy->fifo_head,oy->headerbytes); |
| 748 | og->header_len=oy->headerbytes; |
| 749 | og->body=ogg_buffer_split(&oy->fifo_tail,&oy->fifo_head,oy->bodybytes); |
| 750 | og->body_len=oy->bodybytes; |
| 751 | }else{ |
| 752 | /* simply advance */ |
| 753 | oy->fifo_tail= |
| 754 | ogg_buffer_pretruncate(oy->fifo_tail,oy->headerbytes+oy->bodybytes); |
| 755 | if(!oy->fifo_tail)oy->fifo_head=0; |
| 756 | } |
| 757 | |
| 758 | ret=oy->headerbytes+oy->bodybytes; |
| 759 | oy->unsynced=0; |
| 760 | oy->headerbytes=0; |
| 761 | oy->bodybytes=0; |
| 762 | oy->fifo_fill-=ret; |
| 763 | |
| 764 | return ret; |
| 765 | |
| 766 | sync_fail: |
| 767 | |
| 768 | oy->headerbytes=0; |
| 769 | oy->bodybytes=0; |
| 770 | oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,1); |
| 771 | ret--; |
| 772 | |
| 773 | /* search forward through fragments for possible capture */ |
| 774 | while(oy->fifo_tail){ |
| 775 | /* invariant: fifo_cursor points to a position in fifo_tail */ |
| 776 | unsigned char *now=oy->fifo_tail->buffer->data+oy->fifo_tail->begin; |
| 777 | unsigned char *next=memchr(now, 'O', oy->fifo_tail->length); |
| 778 | |
| 779 | if(next){ |
| 780 | /* possible capture in this segment */ |
| 781 | long bytes=next-now; |
| 782 | oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,bytes); |
| 783 | ret-=bytes; |
| 784 | break; |
| 785 | }else{ |
| 786 | /* no capture. advance to next segment */ |
| 787 | long bytes=oy->fifo_tail->length; |
| 788 | ret-=bytes; |
| 789 | oy->fifo_tail=ogg_buffer_pretruncate(oy->fifo_tail,bytes); |
| 790 | } |
| 791 | } |
| 792 | if(!oy->fifo_tail)oy->fifo_head=0; |
| 793 | oy->fifo_fill+=ret; |
| 794 | |
| 795 | sync_out: |
| 796 | return ret; |
| 797 | } |
| 798 | |
| 799 | /* sync the stream and get a page. Keep trying until we find a page. |
| 800 | Supress 'sync errors' after reporting the first. |
| 801 | |
| 802 | return values: |
| 803 | OGG_HOLE) recapture (hole in data) |
| 804 | 0) need more data |
| 805 | 1) page returned |
| 806 | |
| 807 | Returns pointers into buffered data; invalidated by next call to |
| 808 | _stream, _clear, _init, or _buffer */ |
| 809 | |
| 810 | int ogg_sync_pageout(ogg_sync_state *oy, ogg_page *og){ |
| 811 | |
| 812 | /* all we need to do is verify a page at the head of the stream |
| 813 | buffer. If it doesn't verify, we look for the next potential |
| 814 | frame */ |
| 815 | |
| 816 | while(1){ |
| 817 | long ret=ogg_sync_pageseek(oy,og); |
| 818 | if(ret>0){ |
| 819 | /* have a page */ |
| 820 | return 1; |
| 821 | } |
| 822 | if(ret==0){ |
| 823 | /* need more data */ |
| 824 | return 0; |
| 825 | } |
| 826 | |
| 827 | /* head did not start a synced page... skipped some bytes */ |
| 828 | if(!oy->unsynced){ |
| 829 | oy->unsynced=1; |
| 830 | return OGG_HOLE; |
| 831 | } |
| 832 | |
| 833 | /* loop. keep looking */ |
| 834 | |
| 835 | } |
| 836 | } |
| 837 | |
| 838 | /* clear things to an initial state. Good to call, eg, before seeking */ |
| 839 | int ogg_sync_reset(ogg_sync_state *oy){ |
| 840 | |
| 841 | ogg_buffer_release(oy->fifo_tail); |
| 842 | oy->fifo_tail=0; |
| 843 | oy->fifo_head=0; |
| 844 | oy->fifo_fill=0; |
| 845 | |
| 846 | oy->unsynced=0; |
| 847 | oy->headerbytes=0; |
| 848 | oy->bodybytes=0; |
| 849 | return OGG_SUCCESS; |
| 850 | } |
| 851 | |
| 852 | void ogg_stream_init(ogg_stream_state *os, int serialno){ |
| 853 | memset(os, 0, sizeof(*os)); |
| 854 | os->serialno=serialno; |
| 855 | os->pageno=-1; |
| 856 | } |
| 857 | |
| 858 | ogg_stream_state *ogg_stream_create(int serialno){ |
| 859 | ogg_stream_state *os=_ogg_calloc(1,sizeof(*os)); |
| 860 | os->serialno=serialno; |
| 861 | os->pageno=-1; |
| 862 | return os; |
| 863 | } |
| 864 | |
| 865 | int ogg_stream_clear(ogg_stream_state *os){ |
| 866 | if(os){ |
| 867 | ogg_buffer_release(os->header_tail); |
| 868 | ogg_buffer_release(os->body_tail); |
| 869 | memset(os,0,sizeof(*os)); |
| 870 | } |
| 871 | return OGG_SUCCESS; |
| 872 | } |
| 873 | |
| 874 | int ogg_stream_destroy(ogg_stream_state *os){ |
| 875 | if(os){ |
| 876 | ogg_buffer_release(os->header_tail); |
| 877 | ogg_buffer_release(os->body_tail); |
| 878 | memset(os,0,sizeof(*os)); |
| 879 | _ogg_free(os); |
| 880 | } |
| 881 | return OGG_SUCCESS; |
| 882 | } |
| 883 | |
| 884 | |
| 885 | #define FINFLAG 0x80000000UL |
| 886 | #define FINMASK 0x7fffffffUL |
| 887 | |
| 888 | static void _next_lace(oggbyte_buffer *ob,ogg_stream_state *os){ |
| 889 | /* search ahead one lace */ |
| 890 | os->body_fill_next=0; |
| 891 | while(os->laceptr<os->lacing_fill){ |
| 892 | int val=oggbyte_read1(ob,27+os->laceptr++); |
| 893 | os->body_fill_next+=val; |
| 894 | if(val<255){ |
| 895 | os->body_fill_next|=FINFLAG; |
| 896 | os->clearflag=1; |
| 897 | break; |
| 898 | } |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | static void _span_queued_page(ogg_stream_state *os){ |
| 903 | while( !(os->body_fill&FINFLAG) ){ |
| 904 | |
| 905 | if(!os->header_tail)break; |
| 906 | |
| 907 | /* first flush out preceeding page header (if any). Body is |
| 908 | flushed as it's consumed, so that's not done here. */ |
| 909 | |
| 910 | if(os->lacing_fill>=0) |
| 911 | os->header_tail=ogg_buffer_pretruncate(os->header_tail, |
| 912 | os->lacing_fill+27); |
| 913 | os->lacing_fill=0; |
| 914 | os->laceptr=0; |
| 915 | os->clearflag=0; |
| 916 | |
| 917 | if(!os->header_tail){ |
| 918 | os->header_head=0; |
| 919 | break; |
| 920 | }else{ |
| 921 | |
| 922 | /* process/prepare next page, if any */ |
| 923 | |
| 924 | long pageno; |
| 925 | oggbyte_buffer ob; |
| 926 | ogg_page og; /* only for parsing header values */ |
| 927 | og.header=os->header_tail; /* only for parsing header values */ |
| 928 | pageno=ogg_page_pageno(&og); |
| 929 | |
| 930 | oggbyte_init(&ob,os->header_tail); |
| 931 | os->lacing_fill=oggbyte_read1(&ob,26); |
| 932 | |
| 933 | /* are we in sequence? */ |
| 934 | if(pageno!=os->pageno){ |
| 935 | if(os->pageno==-1) /* indicates seek or reset */ |
| 936 | os->holeflag=1; /* set for internal use */ |
| 937 | else |
| 938 | os->holeflag=2; /* set for external reporting */ |
| 939 | |
| 940 | os->body_tail=ogg_buffer_pretruncate(os->body_tail, |
| 941 | os->body_fill); |
| 942 | if(os->body_tail==0)os->body_head=0; |
| 943 | os->body_fill=0; |
| 944 | |
| 945 | } |
| 946 | |
| 947 | if(ogg_page_continued(&og)){ |
| 948 | if(os->body_fill==0){ |
| 949 | /* continued packet, but no preceeding data to continue */ |
| 950 | /* dump the first partial packet on the page */ |
| 951 | _next_lace(&ob,os); |
| 952 | os->body_tail= |
| 953 | ogg_buffer_pretruncate(os->body_tail,os->body_fill_next&FINMASK); |
| 954 | if(os->body_tail==0)os->body_head=0; |
| 955 | /* set span flag */ |
| 956 | if(!os->spanflag && !os->holeflag)os->spanflag=2; |
| 957 | } |
| 958 | }else{ |
| 959 | if(os->body_fill>0){ |
| 960 | /* preceeding data to continue, but not a continued page */ |
| 961 | /* dump body_fill */ |
| 962 | os->body_tail=ogg_buffer_pretruncate(os->body_tail, |
| 963 | os->body_fill); |
| 964 | if(os->body_tail==0)os->body_head=0; |
| 965 | os->body_fill=0; |
| 966 | |
| 967 | /* set espan flag */ |
| 968 | if(!os->spanflag && !os->holeflag)os->spanflag=2; |
| 969 | } |
| 970 | } |
| 971 | |
| 972 | if(os->laceptr<os->lacing_fill){ |
| 973 | os->granulepos=ogg_page_granulepos(&og); |
| 974 | |
| 975 | /* get current packet size & flag */ |
| 976 | _next_lace(&ob,os); |
| 977 | os->body_fill+=os->body_fill_next; /* addition handles the flag fine; |
| 978 | unsigned on purpose */ |
| 979 | /* ...and next packet size & flag */ |
| 980 | _next_lace(&ob,os); |
| 981 | |
| 982 | } |
| 983 | |
| 984 | os->pageno=pageno+1; |
| 985 | os->e_o_s=ogg_page_eos(&og); |
| 986 | os->b_o_s=ogg_page_bos(&og); |
| 987 | |
| 988 | } |
| 989 | } |
| 990 | } |
| 991 | |
| 992 | /* add the incoming page to the stream state; we decompose the page |
| 993 | into packet segments here as well. */ |
| 994 | |
| 995 | int ogg_stream_pagein(ogg_stream_state *os, ogg_page *og){ |
| 996 | |
| 997 | int serialno=ogg_page_serialno(og); |
| 998 | int version=ogg_page_version(og); |
| 999 | |
| 1000 | /* check the serial number */ |
| 1001 | if(serialno!=os->serialno){ |
| 1002 | //ogg_page_release(og); |
| 1003 | return OGG_ESERIAL; |
| 1004 | } |
| 1005 | if(version>0){ |
| 1006 | //ogg_page_release(og); |
| 1007 | return OGG_EVERSION; |
| 1008 | } |
| 1009 | |
| 1010 | /* add to fifos */ |
| 1011 | if(!os->body_tail){ |
| 1012 | os->body_tail=og->body; |
| 1013 | os->body_head=ogg_buffer_walk(og->body); |
| 1014 | }else{ |
| 1015 | os->body_head=ogg_buffer_cat(os->body_head,og->body); |
| 1016 | } |
| 1017 | if(!os->header_tail){ |
| 1018 | os->header_tail=og->header; |
| 1019 | os->header_head=ogg_buffer_walk(og->header); |
| 1020 | os->lacing_fill=-27; |
| 1021 | }else{ |
| 1022 | os->header_head=ogg_buffer_cat(os->header_head,og->header); |
| 1023 | } |
| 1024 | |
| 1025 | memset(og,0,sizeof(*og)); |
| 1026 | return OGG_SUCCESS; |
| 1027 | } |
| 1028 | |
| 1029 | int ogg_stream_reset(ogg_stream_state *os){ |
| 1030 | |
| 1031 | ogg_buffer_release(os->header_tail); |
| 1032 | ogg_buffer_release(os->body_tail); |
| 1033 | os->header_tail=os->header_head=0; |
| 1034 | os->body_tail=os->body_head=0; |
| 1035 | |
| 1036 | os->e_o_s=0; |
| 1037 | os->b_o_s=0; |
| 1038 | os->pageno=-1; |
| 1039 | os->packetno=0; |
| 1040 | os->granulepos=0; |
| 1041 | |
| 1042 | os->body_fill=0; |
| 1043 | os->lacing_fill=0; |
| 1044 | |
| 1045 | os->holeflag=0; |
| 1046 | os->spanflag=0; |
| 1047 | os->clearflag=0; |
| 1048 | os->laceptr=0; |
| 1049 | os->body_fill_next=0; |
| 1050 | |
| 1051 | return OGG_SUCCESS; |
| 1052 | } |
| 1053 | |
| 1054 | int ogg_stream_reset_serialno(ogg_stream_state *os,int serialno){ |
| 1055 | ogg_stream_reset(os); |
| 1056 | os->serialno=serialno; |
| 1057 | return OGG_SUCCESS; |
| 1058 | } |
| 1059 | |
| 1060 | static int _packetout(ogg_stream_state *os,ogg_packet *op,int adv){ |
| 1061 | |
| 1062 | ogg_packet_release(op); |
| 1063 | _span_queued_page(os); |
| 1064 | |
| 1065 | if(os->holeflag){ |
| 1066 | int temp=os->holeflag; |
| 1067 | if(os->clearflag) |
| 1068 | os->holeflag=0; |
| 1069 | else |
| 1070 | os->holeflag=1; |
| 1071 | if(temp==2){ |
| 1072 | os->packetno++; |
| 1073 | return OGG_HOLE; |
| 1074 | } |
| 1075 | } |
| 1076 | if(os->spanflag){ |
| 1077 | int temp=os->spanflag; |
| 1078 | if(os->clearflag) |
| 1079 | os->spanflag=0; |
| 1080 | else |
| 1081 | os->spanflag=1; |
| 1082 | if(temp==2){ |
| 1083 | os->packetno++; |
| 1084 | return OGG_SPAN; |
| 1085 | } |
| 1086 | } |
| 1087 | |
| 1088 | if(!(os->body_fill&FINFLAG)) return 0; |
| 1089 | if(!op && !adv)return 1; /* just using peek as an inexpensive way |
| 1090 | to ask if there's a whole packet |
| 1091 | waiting */ |
| 1092 | if(op){ |
| 1093 | op->b_o_s=os->b_o_s; |
| 1094 | if(os->e_o_s && os->body_fill_next==0) |
| 1095 | op->e_o_s=os->e_o_s; |
| 1096 | else |
| 1097 | op->e_o_s=0; |
| 1098 | if( (os->body_fill&FINFLAG) && !(os->body_fill_next&FINFLAG) ) |
| 1099 | op->granulepos=os->granulepos; |
| 1100 | else |
| 1101 | op->granulepos=-1; |
| 1102 | op->packetno=os->packetno; |
| 1103 | } |
| 1104 | |
| 1105 | if(adv){ |
| 1106 | oggbyte_buffer ob; |
| 1107 | oggbyte_init(&ob,os->header_tail); |
| 1108 | |
| 1109 | /* split the body contents off */ |
| 1110 | if(op){ |
| 1111 | op->packet=ogg_buffer_split(&os->body_tail,&os->body_head, |
| 1112 | os->body_fill&FINMASK); |
| 1113 | op->bytes=os->body_fill&FINMASK; |
| 1114 | }else{ |
| 1115 | os->body_tail=ogg_buffer_pretruncate(os->body_tail, |
| 1116 | os->body_fill&FINMASK); |
| 1117 | if(os->body_tail==0)os->body_head=0; |
| 1118 | } |
| 1119 | |
| 1120 | /* update lacing pointers */ |
| 1121 | os->body_fill=os->body_fill_next; |
| 1122 | _next_lace(&ob,os); |
| 1123 | }else{ |
| 1124 | if(op){ |
| 1125 | op->packet=ogg_buffer_sub(os->body_tail,os->body_fill&FINMASK); |
| 1126 | op->bytes=os->body_fill&FINMASK; |
| 1127 | } |
| 1128 | } |
| 1129 | |
| 1130 | if(adv){ |
| 1131 | os->packetno++; |
| 1132 | os->b_o_s=0; |
| 1133 | } |
| 1134 | |
| 1135 | return 1; |
| 1136 | } |
| 1137 | |
| 1138 | int ogg_stream_packetout(ogg_stream_state *os,ogg_packet *op){ |
| 1139 | return _packetout(os,op,1); |
| 1140 | } |
| 1141 | |
| 1142 | int ogg_stream_packetpeek(ogg_stream_state *os,ogg_packet *op){ |
| 1143 | return _packetout(os,op,0); |
| 1144 | } |
| 1145 | |
| 1146 | int ogg_packet_release(ogg_packet *op) { |
| 1147 | if(op){ |
| 1148 | ogg_buffer_release(op->packet); |
| 1149 | memset(op, 0, sizeof(*op)); |
| 1150 | } |
| 1151 | return OGG_SUCCESS; |
| 1152 | } |
| 1153 | |
| 1154 | int ogg_page_release(ogg_page *og) { |
| 1155 | if(og){ |
| 1156 | ogg_buffer_release(og->header); |
| 1157 | ogg_buffer_release(og->body); |
| 1158 | memset(og, 0, sizeof(*og)); |
| 1159 | } |
| 1160 | return OGG_SUCCESS; |
| 1161 | } |
| 1162 | |
| 1163 | void ogg_page_dup(ogg_page *dup,ogg_page *orig){ |
| 1164 | dup->header_len=orig->header_len; |
| 1165 | dup->body_len=orig->body_len; |
| 1166 | dup->header=ogg_buffer_dup(orig->header); |
| 1167 | dup->body=ogg_buffer_dup(orig->body); |
| 1168 | } |
| 1169 | |