oggz_read.c 23.5 KB
Newer Older
andre's avatar
andre committed
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63
/*
   Copyright (C) 2003 Commonwealth Scientific and Industrial Research
   Organisation (CSIRO) Australia

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions
   are met:

   - Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.

   - Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.

   - Neither the name of CSIRO Australia nor the names of its
   contributors may be used to endorse or promote products derived from
   this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
   PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE ORGANISATION OR
   CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
   EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
   PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
   PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
   LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
   NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

/*
 * oggz_read.c
 *
 * Conrad Parker <conrad@annodex.net>
 */

#include "config.h"

#if OGGZ_CONFIG_READ

#include <assert.h>
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <time.h>

#include <ogg/ogg.h>

#include "oggz_private.h"

/*#define DEBUG*/

/*#define DEBUG_BY_READING_PAGES*/

#define CHUNKSIZE 8500

conrad's avatar
conrad committed
64 65
#define oggz_off_t long

andre's avatar
andre committed
66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
OGGZ *
oggz_read_init (OGGZ * oggz)
{
  OggzReader * reader = &oggz->x.reader;

  ogg_sync_init (&reader->ogg_sync);
  ogg_stream_init (&reader->ogg_stream, (int)-1);
  reader->current_serialno = -1;

  reader->read_packet = NULL;
  reader->read_user_data = NULL;

  reader->current_unit = 0;

  return oggz;
}

OGGZ *
oggz_read_close (OGGZ * oggz)
{
  OggzReader * reader = &oggz->x.reader;

  ogg_sync_clear (&reader->ogg_sync);

  return oggz;
}

int
oggz_set_read_callback (OGGZ * oggz, long serialno,
			OggzReadPacket read_packet, void * user_data)
{
  OggzReader * reader;
  oggz_stream_t * stream;

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

  reader =  &oggz->x.reader;

  if (oggz->flags & OGGZ_WRITE) {
    return OGGZ_ERR_INVALID;
  }

  if (serialno == -1) {
    reader->read_packet = read_packet;
    reader->read_user_data = user_data;
  } else {
    stream = oggz_get_stream (oggz, serialno);
conrad's avatar
conrad committed
113
#if 0
andre's avatar
andre committed
114
    if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
conrad's avatar
conrad committed
115 116 117 118
#else
    if (stream == NULL)
      stream = oggz_add_stream (oggz, serialno);
#endif
andre's avatar
andre committed
119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136

    stream->read_packet = read_packet;
    stream->read_user_data = user_data;
  }

  return 0;
}

/*
 * oggz_get_next_page_7 (oggz, og, do_read)
 *
 * MODIFIED COPY OF CODE FROM BELOW SEEKING STUFF
 *
 * retrieves the next page.
 * returns >= 0 if found; return value is offset of page start
 * returns -1 on error
 * returns -2 if EOF was encountered
 */
conrad's avatar
conrad committed
137
static oggz_off_t
andre's avatar
andre committed
138 139 140 141 142 143 144
oggz_get_next_page_7 (OGGZ * oggz, ogg_page * og)
{
  OggzReader * reader = &oggz->x.reader;
#if _UNMODIFIED
  char * buffer;
#endif
  long bytes = 0, more;
conrad's avatar
conrad committed
145
  oggz_off_t page_offset = 0, ret;
andre's avatar
andre committed
146 147 148 149 150 151 152 153 154
  int found = 0;

  do {
    more = ogg_sync_pageseek (&reader->ogg_sync, og);

    if (more == 0) {
      page_offset = 0;
#if _UMMODIFIED_
      buffer = ogg_sync_buffer (&reader->ogg_sync, CHUNKSIZE);
conrad's avatar
conrad committed
155 156 157 158 159
      if ((bytes = fread (buffer, 1, CHUNKSIZE, oggz->file)) == 0) {
	if (ferror (oggz->file)) {
	  oggz_set_error (oggz, OGGZ_ERR_SYSTEM);
	  return -1;
	}
andre's avatar
andre committed
160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185
      }

      if (bytes == 0) {
	return -2;
      }

      ogg_sync_wrote(&reader->ogg_sync, bytes);
#else
      return -2;
#endif
    } else if (more < 0) {
#ifdef DEBUG
      printf ("get_next_page: skipped %ld bytes\n", -more);
#endif
      page_offset -= more;
    } else {
#ifdef DEBUG
      printf ("get_next_page: page has %ld bytes\n", more);
#endif
      found = 1;
    }

  } while (!found);

  /* Calculate the byte offset of the page which was found */
  if (bytes > 0) {
conrad's avatar
conrad committed
186
    oggz->offset = ftell (oggz->file) - bytes + page_offset;
andre's avatar
andre committed
187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248
    ret = oggz->offset;
  } else {
    /* didn't need to do any reading -- accumulate the page_offset */
    ret = oggz->offset + page_offset;
    oggz->offset += page_offset + more;
  }

  return ret;
}

static long
oggz_read_sync (OGGZ * oggz)
{
  OggzReader * reader = &oggz->x.reader;
  long nread = 0;

  oggz_stream_t * stream;
  ogg_stream_state * os;
  ogg_packet * op;
  long serialno;

  ogg_packet packet;
  ogg_page og;

  /*os = &reader->ogg_stream;*/
  op = &packet;

  /* handle one packet.  Try to fetch it from current stream state */
  /* extract packets from page */
  while(1){

    if (reader->current_serialno != -1) {
    /* process a packet if we can.  If the machine isn't loaded,
       neither is a page */
    while(1) {
      ogg_int64_t granulepos;
      int result;

      serialno = reader->current_serialno;

      stream = oggz_get_stream (oggz, serialno);
      
      if (stream == NULL) {
	/* new stream ... check bos etc. */
	if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	  /* error -- could not add stream */
	  return -1;
	}
      }
      os = &stream->ogg_stream;
      
      result = ogg_stream_packetout(os, op);

      if(result == -1) {
	/* hole in the data. */
	return -1;
      }

      if(result > 0){
	/* got a packet.  process it */
	granulepos = op->granulepos;

conrad's avatar
conrad committed
249 250 251 252
	if (!stream->metric && (oggz->flags & OGGZ_AUTO)) {
	  oggz_auto (oggz, op, serialno, NULL);
	}

andre's avatar
andre committed
253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337
	if ((oggz->metric || stream->metric) && granulepos != -1) {
	  reader->current_unit = oggz_get_unit (oggz, serialno, granulepos);
	}
#ifndef DEBUG_BY_READING_PAGES
	if (stream->read_packet) {
	  stream->read_packet (oggz, op, serialno, stream->read_user_data);
	} else if (reader->read_packet) {
	  reader->read_packet (oggz, op, serialno, reader->read_user_data);
	}
#endif /* DEBUG_BY_READING_PAGES */
      }
      else
	break;
    }
    }

    if(oggz_get_next_page_7 (oggz, &og) < 0)
      return -404; /* eof. leave unitialized */

    serialno = ogg_page_serialno (&og);
    reader->current_serialno = serialno; /* XXX: maybe not necessary */

    stream = oggz_get_stream (oggz, serialno);
      
    if (stream == NULL) {
      /* new stream ... check bos etc. */
      if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	/* error -- could not add stream */
	return -1;
      }
    }
    os = &stream->ogg_stream;

#ifdef DEBUG_BY_READING_PAGES
    {
      ogg_packet op_debug;
      op_debug.packet = og.body;
      op_debug.bytes = og.body_len;
      op_debug.b_o_s = ogg_page_bos (&og);
      op_debug.e_o_s = ogg_page_eos (&og);
      op_debug.granulepos = ogg_page_granulepos (&og);
      op_debug.packetno = ogg_page_packets (&og);

      if (stream->read_packet) {
	stream->read_packet (oggz, &op_debug, serialno,
			     stream->read_user_data);
      } else if (reader->read_packet) {
	reader->read_packet (oggz, &op_debug, serialno,
			     reader->read_user_data);
      }
    }
#endif

#if 0
    /* bitrate tracking; add the header's bytes here, the body bytes
       are done by packet above */
    vf->bittrack+=og.header_len*8;
#endif

    ogg_stream_pagein(os, &og);
  }

  return nread; /* XXX: nread isn't even looked at!!! */
}

long
oggz_read (OGGZ * oggz, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, bytes_read = 1, remaining = n, nread = 0;

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

  if (oggz->flags & OGGZ_WRITE) {
    return OGGZ_ERR_INVALID;
  }

  reader = &oggz->x.reader;

  oggz_read_sync (oggz);

  while (bytes_read > 0 && remaining > 0) {
    bytes = MIN (remaining, 4096);
    buffer = ogg_sync_buffer (&reader->ogg_sync, bytes);
conrad's avatar
conrad committed
338 339 340 341
    if ((bytes_read = fread (buffer, 1, bytes, oggz->file)) == 0) {
      if (ferror (oggz->file)) {
	return OGGZ_ERR_SYSTEM;
      }
andre's avatar
andre committed
342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391
    }

    ogg_sync_wrote (&reader->ogg_sync, bytes_read);
    
    remaining -= bytes_read;
    nread += bytes_read;

    oggz_read_sync (oggz);
  }

  return nread;
}

/* generic */
long
oggz_read_input (OGGZ * oggz, unsigned char * buf, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, remaining = n, nread = 0;

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

  if (oggz->flags & OGGZ_WRITE) {
    return OGGZ_ERR_INVALID;
  }

  reader = &oggz->x.reader;

  oggz_read_sync (oggz);

  while (/* !oggz->eos && */ remaining > 0) {
    bytes = MIN (remaining, 4096);
    buffer = ogg_sync_buffer (&reader->ogg_sync, bytes);
    memcpy (buffer, buf, bytes);
    ogg_sync_wrote (&reader->ogg_sync, bytes);

    buf += bytes;
    remaining -= bytes;
    nread += bytes;

    oggz_read_sync (oggz);    
  }

  return nread;
}

/* oggz_seek() related functions from here down */

/*
conrad's avatar
conrad committed
392
 * The typical usage is:
andre's avatar
andre committed
393 394 395 396
 *
 *   oggz_set_data_start (oggz, oggz_tell (oggz));
 */
int
conrad's avatar
conrad committed
397
oggz_set_data_start (OGGZ * oggz, oggz_off_t offset)
andre's avatar
andre committed
398 399 400 401 402 403 404 405 406 407
{
  if (oggz == NULL) return -1;

  if (offset < 0) return -1;

  oggz->offset_data_begin = offset;

  return 0;
}

conrad's avatar
conrad committed
408
static oggz_off_t
andre's avatar
andre committed
409 410
oggz_tell_raw (OGGZ * oggz)
{
conrad's avatar
conrad committed
411
  oggz_off_t offset_at;
andre's avatar
andre committed
412

conrad's avatar
conrad committed
413
  offset_at = ftell (oggz->file);
andre's avatar
andre committed
414 415 416 417 418 419 420

  return offset_at;
}

/*
 * seeks and syncs
 */
conrad's avatar
conrad committed
421 422
static oggz_off_t
oggz_seek_raw (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
423 424
{
  OggzReader * reader = &oggz->x.reader;
conrad's avatar
conrad committed
425
  oggz_off_t offset_at;
andre's avatar
andre committed
426

conrad's avatar
conrad committed
427
  if (fseek (oggz->file, offset, whence) == -1) {
andre's avatar
andre committed
428
    if (errno == ESPIPE) {
conrad's avatar
conrad committed
429
      /*oggz_set_error (oggz, OGGZ_ERR_NOSEEK);*/
andre's avatar
andre committed
430
    } else {
conrad's avatar
conrad committed
431
      /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
andre's avatar
andre committed
432 433 434 435
    }
    return -1;
  }

conrad's avatar
conrad committed
436 437
  offset_at = ftell (oggz->file);

andre's avatar
andre committed
438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457
  oggz->offset = offset_at;

  ogg_sync_reset (&reader->ogg_sync);

  return offset_at;
}

static int
oggz_stream_reset (void * data)
{
  oggz_stream_t * stream = (oggz_stream_t *) data;

  if (stream->ogg_stream.serialno != -1) {
    ogg_stream_reset (&stream->ogg_stream);
  }

  return 0;
}

static long
conrad's avatar
conrad committed
458
oggz_reset (OGGZ * oggz, oggz_off_t offset, ogg_int64_t unit, int whence)
andre's avatar
andre committed
459 460 461
{
  OggzReader * reader = &oggz->x.reader;

conrad's avatar
conrad committed
462
  oggz_off_t offset_at;
andre's avatar
andre committed
463 464 465 466 467 468 469 470 471 472

  offset_at = oggz_seek_raw (oggz, offset, whence);
  if (offset_at == -1) return -1;

  oggz->offset = offset_at;

#ifdef DEBUG
  printf ("reset to %ld\n", offset_at);
#endif

conrad's avatar
conrad committed
473
  oggz_vector_foreach (oggz->streams, oggz_stream_reset);
andre's avatar
andre committed
474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492

#if 0
  ogg_stream_reset (&oggz->ogg_stream);
  /*  ogg_stream_reset_serialno (&oggz->ogg_stream, oggz->anno_serialno);*/
#endif

  if (unit != -1) reader->current_unit = unit;

  return offset_at;
}

/*
 * oggz_get_next_page (oggz, og, do_read)
 *
 * retrieves the next page.
 * returns >= 0 if found; return value is offset of page start
 * returns -1 on error
 * returns -2 if EOF was encountered
 */
conrad's avatar
conrad committed
493
static oggz_off_t
andre's avatar
andre committed
494 495 496 497 498
oggz_get_next_page (OGGZ * oggz, ogg_page * og)
{
  OggzReader * reader = &oggz->x.reader;
  char * buffer;
  long bytes = 0, more;
conrad's avatar
conrad committed
499
  oggz_off_t page_offset = 0, ret;
andre's avatar
andre committed
500 501 502 503 504 505 506 507 508
  int found = 0;

  do {
    more = ogg_sync_pageseek (&reader->ogg_sync, og);

    if (more == 0) {
      page_offset = 0;

      buffer = ogg_sync_buffer (&reader->ogg_sync, CHUNKSIZE);
conrad's avatar
conrad committed
509 510 511 512 513
      if ((bytes = fread (buffer, 1, CHUNKSIZE, oggz->file)) == 0) {
	if (ferror (oggz->file)) {
	  /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
	  return -1;
	}
andre's avatar
andre committed
514 515
      }

conrad's avatar
conrad committed
516 517
      if (bytes == 0 || feof (oggz->file)) {
	clearerr (oggz->file);
andre's avatar
andre committed
518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
	return -2;
      }

      ogg_sync_wrote(&reader->ogg_sync, bytes);

    } else if (more < 0) {
#ifdef DEBUG
      printf ("get_next_page: skipped %ld bytes\n", -more);
#endif
      page_offset -= more;
    } else {
#ifdef DEBUG
      printf ("get_next_page: page has %ld bytes\n", more);
#endif
      found = 1;
    }

  } while (!found);

  /* Calculate the byte offset of the page which was found */
  if (bytes > 0) {
    oggz->offset = oggz_tell_raw (oggz) - bytes + page_offset;
    ret = oggz->offset;
  } else {
    /* didn't need to do any reading -- accumulate the page_offset */
    ret = oggz->offset + page_offset;
    oggz->offset += page_offset + more;
  }

  return ret;
}

conrad's avatar
conrad committed
550
static oggz_off_t
andre's avatar
andre committed
551 552
oggz_get_next_start_page (OGGZ * oggz, ogg_page * og)
{
conrad's avatar
conrad committed
553
  oggz_off_t page_offset;
andre's avatar
andre committed
554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571
  int found = 0;

  while (!found) {
    page_offset = oggz_get_next_page (oggz, og);

    /* Return this value if one of the following conditions is met:
     *
     *   page_offset < 0     : error or EOF
     *   page_offset == 0    : start of stream
     *   !ogg_page_continued : start of page
     */
    if (page_offset <= 0 || !ogg_page_continued (og))
      found = 1;
  }

  return page_offset;
}

conrad's avatar
conrad committed
572
static oggz_off_t
andre's avatar
andre committed
573 574 575
oggz_get_prev_start_page (OGGZ * oggz, ogg_page * og,
			 ogg_int64_t * granule, long * serialno)
{
conrad's avatar
conrad committed
576 577
  oggz_off_t offset_at, offset_start;
  oggz_off_t page_offset, prev_offset = 0;
andre's avatar
andre committed
578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646
  long granule_at = -1;

#if 0
  offset_at = oggz_tell_raw (oggz);
  if (offset_at == -1) return -1;
#else
  offset_at = oggz->offset;
#endif

  offset_start = offset_at;

  do {

    offset_start = offset_at - CHUNKSIZE;
    if (offset_start < 0) offset_start = 0;

    offset_start = oggz_seek_raw (oggz, offset_start, SEEK_SET);
    if (offset_start == -1) return -1;

#ifdef DEBUG

    printf ("[A] offset_at: @%ld\toffset_start: @%ld\n",
	    offset_at, offset_start);

    printf ("*** get_prev_start_page: seeked to %ld\n", offset_start);
#endif

    page_offset = 0;

    do {
      prev_offset = page_offset;

      page_offset = oggz_get_next_start_page (oggz, og);
      if (page_offset == -1) return -1;
      if (page_offset == -2) break;

      granule_at = (long)ogg_page_granulepos (og);

#ifdef DEBUG
      printf ("\tGOT page (%ld) @%ld\tat @%ld\n", granule_at,
	      page_offset, offset_at);
#endif

      /* Need to stash the granule and serialno of this page because og
       * will be overwritten by the time we realise this was the desired
       * prev page */
      if (page_offset >= 0 && page_offset < offset_at) {
	*granule = granule_at;
	*serialno = ogg_page_serialno (og);
      }

    } while (page_offset >= 0 && page_offset < offset_at);

#ifdef DEBUG
    printf ("[B] offset_at: @%ld\toffset_start: @%ld\n"
	    "prev_offset: @%ld\tpage_offset: @%ld\n",
	    offset_at, offset_start, prev_offset, page_offset);
#endif
    /* reset the file offset */
    offset_at = offset_start;

  } while (offset_at > 0 && prev_offset == 0);

  if (offset_at > 0)
    return prev_offset;
  else
    return -1;
}

conrad's avatar
conrad committed
647
static oggz_off_t
andre's avatar
andre committed
648
oggz_scan_for_page (OGGZ * oggz, ogg_page * og, ogg_int64_t unit_target,
conrad's avatar
conrad committed
649
		   oggz_off_t offset_begin, oggz_off_t offset_end)
andre's avatar
andre committed
650
{
conrad's avatar
conrad committed
651 652
  oggz_off_t offset_at, offset_next;
  oggz_off_t offset_prev = -1;
andre's avatar
andre committed
653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748
  ogg_int64_t granule_at;
  ogg_int64_t unit_at;
  long serialno;

#ifdef DEBUG
  printf (" SCANNING from %ld...", offset_begin);
#endif

  while (1) {
    offset_at = oggz_seek_raw (oggz, offset_begin, SEEK_SET);
    if (offset_at == -1) return -1;

#ifdef DEBUG
    printf (" scan @%ld\n", offset_at);
#endif

    offset_next = oggz_get_next_start_page (oggz, og);

    if (offset_next < 0) {
      return offset_next;
    }

    if (offset_next == 0 && offset_begin != 0) {
#ifdef DEBUG
      printf (" ... scanned past EOF\n");
#endif
      return -1;
    }
    if (offset_next > offset_end) {
#ifdef DEBUG
      printf (" ... scanned to page %ld\n", (long)ogg_page_granulepos (og));
#endif
      if (offset_prev != -1) {
	offset_at = oggz_seek_raw (oggz, offset_prev, SEEK_SET);
	if (offset_at == -1) return -1;

	offset_next = oggz_get_next_start_page (oggz, og);
	if (offset_next < 0) return offset_next;

	serialno = ogg_page_serialno (og);
	granule_at = ogg_page_granulepos (og);
	unit_at = oggz_get_unit (oggz, serialno, granule_at);

	return offset_at;
      } else {
	return -1;
      }
    }

    offset_at = offset_next;

    serialno = ogg_page_serialno (og);
    granule_at = ogg_page_granulepos (og);
    unit_at = oggz_get_unit (oggz, serialno, granule_at);

    if (unit_at < unit_target) {
#ifdef DEBUG
      printf (" scan: (%ld) < (%ld)\n", unit_at, unit_target);
#endif
      offset_prev = offset_next;
      offset_begin = offset_next+1;
    } else if (unit_at > unit_target) {
#ifdef DEBUG
      printf (" scan: (%ld) > (%ld)\n", unit_at, unit_target);
#endif
#if 0
      /* hole ? */
      offset_at = oggz_seek_raw (oggz, offset_begin, SEEK_SET);
      if (offset_at == -1) return -1;

      offset_next = oggz_get_next_start_page (oggz, og);
      if (offset_next < 0) return offset_next;

      serialno = ogg_page_serialno (og);
      granule_at = ogg_page_granulepos (og);
      unit_at = oggz_get_unit (oggz, serialno, granule_at);

      break;
#else
      return offset_at;
#endif
    } else if (unit_at == unit_target) {
#ifdef DEBUG
      printf (" scan: (%ld) == (%ld)\n", unit_at, unit_target);
#endif
      break;
    }
  }

  return offset_at;
}

static long
oggz_seek_set (OGGZ * oggz, ogg_int64_t unit_target)
{
  OggzReader * reader = &oggz->x.reader;
conrad's avatar
conrad committed
749
  int fd;
andre's avatar
andre committed
750
  struct stat statbuf;
conrad's avatar
conrad committed
751 752
  oggz_off_t offset_orig, offset_at, offset_guess;
  oggz_off_t offset_begin, offset_end, offset_next;
andre's avatar
andre committed
753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
  ogg_int64_t granule_at;
  ogg_int64_t unit_at, unit_begin = 0, unit_end = -1;
  long serialno;
  double guess_ratio;
  ogg_page * og;

  if (oggz == NULL) {
    return -1;
  }

  if (unit_target > 0 && oggz->metric == NULL) {
    /* No metric defined */
    return -1;
  }

conrad's avatar
conrad committed
768 769 770 771 772 773 774
  if (oggz->file == NULL) {
    /*oggz_set_error (oggz, OGGZ_ERR_NOSEEK);*/
    return -1;
  }

  if ((fd = fileno (oggz->file)) == -1) {
    /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
andre's avatar
andre committed
775 776 777
    return -1;
  }

conrad's avatar
conrad committed
778 779
  if (fstat (fd, &statbuf) == -1) {
    /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
andre's avatar
andre committed
780 781 782 783 784 785
    return -1;
  }

  if (S_ISREG(statbuf.st_mode) || S_ISLNK(statbuf.st_mode)) {
    offset_end = statbuf.st_size;
  } else {
conrad's avatar
conrad committed
786
    /*oggz_set_error (oggz, OGGZ_ERR_NOSEEK);*/
andre's avatar
andre committed
787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843
    return -1;
  }

  if (unit_target == reader->current_unit) {
    return reader->current_unit;
  }

  if (unit_target == 0) {
    offset_at = oggz_reset (oggz, oggz->offset_data_begin, 0, SEEK_SET);
    if (offset_at == -1) return -1;
    return 0;
  }

  offset_at = oggz_tell_raw (oggz);
  if (offset_at == -1) return -1;

#if 0
  offset_orig = offset_at;
#else
  offset_orig = oggz->offset;
#endif

  offset_begin = 0;

  unit_at = reader->current_unit;
  unit_begin = 0;
  unit_end = -1;

  og = &oggz->current_page;

  while (1) {

#ifdef DEBUG
    printf ("oggz_read_seek (%ld): (%ld - %ld) [%ld - %ld]\t",
	    unit_target, unit_begin, unit_end, offset_begin, offset_end);
#endif

    if (unit_end == -1) {
      if (unit_at == unit_begin) {
#ifdef DEBUG
	printf ("*G1*");
#endif
	offset_guess = offset_begin + (offset_end - offset_begin)/2;
      } else {
#ifdef DEBUG
	printf ("*G2*");
#endif
	guess_ratio =
	  (double)(unit_target - unit_begin) /
	  (double)(unit_at - unit_begin);

#ifdef DEBUG
	printf ("\nguess_ration %f = (%ld - %ld) / (%ld - %ld)\n",
		guess_ratio, unit_target, unit_begin, unit_at, unit_begin);
#endif

	offset_guess = offset_begin +
conrad's avatar
conrad committed
844
	  (oggz_off_t)((offset_at - offset_begin) * guess_ratio);
andre's avatar
andre committed
845 846 847 848 849 850 851 852 853 854 855 856 857
      }
    } else if (unit_end <= unit_begin) {
#ifdef DEBUG
      printf ("unit_end <= unit_begin\n");
#endif
      break;
    } else {
#if 1
      guess_ratio =
	(double)(unit_target - unit_begin) /
	(double)(unit_end - unit_begin);

      offset_guess = offset_begin +
conrad's avatar
conrad committed
858
	(oggz_off_t)((offset_end - offset_begin) * guess_ratio);
andre's avatar
andre committed
859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952

      /*
      if (offset_guess <= offset_begin) {
	offset_guess = offset_begin + 1;
      }
      */
#else
      offset_guess = offset_begin + (offset_end - offset_begin)/2;
#endif
    }

#ifdef DEBUG
    printf ("%ld ->", offset_guess);
#endif

    offset_at = oggz_seek_raw (oggz, offset_guess, SEEK_SET);
    if (offset_at == -1) {
      goto notfound;
    }

    offset_next = oggz_get_next_start_page (oggz, og);

#ifdef DEBUG
    printf ("\n");
#endif

    if (offset_next < 0) {
      goto notfound;
    }

    if (offset_next > offset_end) {
      offset_next = oggz_scan_for_page (oggz, og, unit_target,
					offset_begin, offset_end);

      if (offset_next < 0) {
	goto notfound;
      }

      offset_at = offset_next;
      serialno = ogg_page_serialno (og);
      granule_at = ogg_page_granulepos (og);

      unit_at = oggz_get_unit (oggz, serialno, granule_at);

      goto found;
    }

    offset_at = offset_next;
    serialno = ogg_page_serialno (og);
    granule_at = ogg_page_granulepos (og);

    unit_at = oggz_get_unit (oggz, serialno, granule_at);

#ifdef DEBUG
    printf ("oggz_read_seek (%ld): got page (%ld) @%ld\n", unit_target,
	    unit_at, offset_at);
#endif

    if (unit_at < unit_target) {
      offset_begin = offset_at;
      unit_begin = unit_at;
    } else if (unit_at > unit_target) {
      offset_end = offset_at-1;
      unit_end = unit_at;
    } else {
      break;
    }


  }

 found:
#ifdef DEBUG
  printf ("FOUND (%ld)\n", unit_at);
#endif

  offset_at = oggz_reset (oggz, offset_at, unit_at, SEEK_SET);
  if (offset_at == -1) return -1;

  return reader->current_unit;

 notfound:
#ifdef DEBUG
  printf ("NOT FOUND\n");
#endif

  oggz_reset (oggz, offset_orig, -1, SEEK_SET);

  return -1;
}

static long
oggz_seek_end (OGGZ * oggz, ogg_int64_t unit_offset)
{
conrad's avatar
conrad committed
953
  oggz_off_t offset_orig, offset_at, offset_end;
andre's avatar
andre committed
954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983
  ogg_int64_t granulepos;
  ogg_int64_t unit_end;
  long serialno;
  ogg_page * og;

  og = &oggz->current_page;

  offset_orig = oggz->offset;

  offset_at = oggz_seek_raw (oggz, 0, SEEK_END);
  if (offset_at == -1) return -1;

  offset_end = oggz_get_prev_start_page (oggz, og, &granulepos, &serialno);

  unit_end = oggz_get_unit (oggz, serialno, granulepos);

  if (offset_end < 0) {
    oggz_reset (oggz, offset_orig, -1, SEEK_SET);
    return -1;
  }
  
#ifdef DEBUG
  printf ("*** oggz_seek_end: found packet (%ld) at @%ld\n",
	  unit_end, offset_end);
#endif

  return oggz_seek_set (oggz, unit_end + unit_offset);
}

off_t
conrad's avatar
conrad committed
984
oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
985 986 987 988 989 990 991 992 993 994 995
{
  ogg_int64_t units = -1;

  if (oggz == NULL) return -1;

  if (oggz->flags & OGGZ_WRITE) {
    return -1;
  }

  if (offset == 0) units = 0;

conrad's avatar
conrad committed
996
  return (off_t)oggz_reset (oggz, offset, units, whence);
andre's avatar
andre committed
997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068
}

long
oggz_seek_units (OGGZ * oggz, ogg_int64_t units, int whence)
{
  OggzReader * reader = &oggz->x.reader;

  if (oggz == NULL) return -1;

  if (oggz->flags & OGGZ_WRITE) {
    return -1;
  }

  if (oggz->metric == NULL) {
    return -1;
  }

  switch (whence) {
  case SEEK_SET:
    return oggz_seek_set (oggz, units);
    break;
  case SEEK_CUR: 
    units += reader->current_unit;
    return oggz_seek_set (oggz, units);
    break;
  case SEEK_END:
    return oggz_seek_end (oggz, units);
    break;
  default:
    /*oggz_set_error (oggz, OGGZ_EINVALID);*/
    return -1;
    break;
  }
}

long
oggz_seek_byorder (OGGZ * oggz, void * target)
{
  return -1;
}

long
oggz_seek_packets (OGGZ * oggz, long serialno, long packets, int whence)
{
  return -1;
}

#else /* OGGZ_CONFIG_READ */

#include <ogg/ogg.h>
#include "oggz_private.h"

int
oggz_set_read_callback (OGGZ * oggz, long serialno,
			OggzReadPacket read_packet, void * user_data)
{
  return OGGZ_ERR_DISABLED;
}

long
oggz_read (OGGZ * oggz, long n)
{
  return OGGZ_ERR_DISABLED;
}

long
oggz_read_input (OGGZ * oggz, unsigned char * buf, long n)
{
  return OGGZ_ERR_DISABLED;
}

off_t
conrad's avatar
conrad committed
1069
oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092
{
  return OGGZ_ERR_DISABLED;
}

long
oggz_seek_units (OGGZ * oggz, ogg_int64_t units, int whence)
{
  return OGGZ_ERR_DISABLED;
}

long
oggz_seek_byorder (OGGZ * oggz, void * target)
{
  return OGGZ_ERR_DISABLED;
}

long
oggz_seek_packets (OGGZ * oggz, long serialno, long packets, int whence)
{
  return OGGZ_ERR_DISABLED;
}

#endif