oggz_read.c 26.7 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
/*
   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>
48

49
#ifdef HAVE_UNISTD_H
andre's avatar
andre committed
50
#include <unistd.h>
51 52
#endif

andre's avatar
andre committed
53 54 55 56 57 58 59
#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <time.h>

#include <ogg/ogg.h>

60
#include "oggz_compat.h"
andre's avatar
andre committed
61 62 63 64 65 66
#include "oggz_private.h"

/*#define DEBUG*/

/*#define DEBUG_BY_READING_PAGES*/

67
#define CHUNKSIZE 65536
andre's avatar
andre committed
68

69
#define OGGZ_READ_EMPTY (-404)
70

conrad's avatar
conrad committed
71 72
#define oggz_off_t long

andre's avatar
andre committed
73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94
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;

95
  ogg_stream_clear (&reader->ogg_stream);
andre's avatar
andre committed
96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
  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
121
#if 0
andre's avatar
andre committed
122
    if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
conrad's avatar
conrad committed
123 124 125 126
#else
    if (stream == NULL)
      stream = oggz_add_stream (oggz, serialno);
#endif
andre's avatar
andre committed
127 128 129 130 131 132 133 134

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

  return 0;
}

135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153
int
oggz_set_read_page (OGGZ * oggz, OggzReadPage read_page, void * user_data)
{
  OggzReader * reader;

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

  reader =  &oggz->x.reader;

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

  reader->read_page = read_page;
  reader->read_page_user_data = user_data;

  return 0;
}

andre's avatar
andre committed
154 155 156 157 158 159 160 161 162 163
/*
 * 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
164
static oggz_off_t
andre's avatar
andre committed
165 166 167 168 169 170 171
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
172
  oggz_off_t page_offset = 0, ret;
andre's avatar
andre committed
173 174 175 176 177 178 179 180 181
  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);
182
      if ((bytes = oggz_io_read (oggz, buffer, CHUNKSIZE)) == 0) {
183
#if 0
conrad's avatar
conrad committed
184 185 186 187
	if (ferror (oggz->file)) {
	  oggz_set_error (oggz, OGGZ_ERR_SYSTEM);
	  return -1;
	}
188
#endif
andre's avatar
andre committed
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
      }

      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) {
215
    oggz->offset = oggz_io_tell (oggz) - bytes + page_offset;
andre's avatar
andre committed
216 217 218 219 220 221 222 223 224 225
    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;
}

226
static int
andre's avatar
andre committed
227 228 229 230 231 232 233 234 235 236 237 238
oggz_read_sync (OGGZ * oggz)
{
  OggzReader * reader = &oggz->x.reader;

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

  ogg_packet packet;
  ogg_page og;

239 240
  int cb_ret = 0;

andre's avatar
andre committed
241 242 243 244 245
  /*os = &reader->ogg_stream;*/
  op = &packet;

  /* handle one packet.  Try to fetch it from current stream state */
  /* extract packets from page */
246
  while(cb_ret == 0){
andre's avatar
andre committed
247 248

    if (reader->current_serialno != -1) {
249 250 251 252 253
    /* process a packet if we can.  If the machine isn't loaded,
       neither is a page */
    while(cb_ret == 0) {
      ogg_int64_t granulepos;
      int result;
andre's avatar
andre committed
254

255
      serialno = reader->current_serialno;
andre's avatar
andre committed
256

257
      stream = oggz_get_stream (oggz, serialno);
258

259 260 261 262 263
      if (stream == NULL) {
	/* new stream ... check bos etc. */
	if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	  /* error -- could not add stream */
	  return -7;
andre's avatar
andre committed
264
	}
265 266
      }
      os = &stream->ogg_stream;
267

268
      result = ogg_stream_packetout(os, op);
andre's avatar
andre committed
269

270 271 272 273
      if(result == -1) {
	/* hole in the data. */
	return -7;
      }
andre's avatar
andre committed
274

275 276 277
      if(result > 0){
	/* got a packet.  process it */
	granulepos = op->granulepos;
andre's avatar
andre committed
278

279 280 281
	if (!stream->metric && (oggz->flags & OGGZ_AUTO)) {
	  oggz_auto (oggz, op, serialno, NULL);
	}
conrad's avatar
conrad committed
282

283
#if 0 /* set unit on last packet of page */
284 285 286
	if ((oggz->metric || stream->metric) && granulepos != -1) {
	  reader->current_unit = oggz_get_unit (oggz, serialno, granulepos);
	}
287 288
#endif

289 290 291 292 293 294
	if (stream->read_packet) {
	  cb_ret =
	    stream->read_packet (oggz, op, serialno, stream->read_user_data);
	} else if (reader->read_packet) {
	  cb_ret =
	    reader->read_packet (oggz, op, serialno, reader->read_user_data);
295
	}
andre's avatar
andre committed
296
      }
297 298 299
      else
	break;
    }
andre's avatar
andre committed
300
    }
301

302
    /* If we've got a stop already, don't read more data in */
303
    if (cb_ret == OGGZ_STOP_OK || cb_ret == OGGZ_STOP_ERR) return cb_ret;
andre's avatar
andre committed
304

305
    if(oggz_get_next_page_7 (oggz, &og) < 0)
306
      return OGGZ_READ_EMPTY; /* eof. leave uninitialized */
andre's avatar
andre committed
307

308 309 310 311
    serialno = ogg_page_serialno (&og);
    reader->current_serialno = serialno; /* XXX: maybe not necessary */

    stream = oggz_get_stream (oggz, serialno);
312

313 314 315 316 317
    if (stream == NULL) {
      /* new stream ... check bos etc. */
      if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	/* error -- could not add stream */
	return -7;
andre's avatar
andre committed
318
      }
319 320
    }
    os = &stream->ogg_stream;
andre's avatar
andre committed
321

322
    {
323 324 325 326 327 328 329
      ogg_int64_t granulepos;

      granulepos = ogg_page_granulepos (&og);
      if ((oggz->metric || stream->metric) && granulepos != -1) {
	reader->current_unit = oggz_get_unit (oggz, serialno, granulepos);
      } else if (granulepos == 0) {
	reader->current_unit = 0;
andre's avatar
andre committed
330
      }
331
    }
332 333 334 335

    if (reader->read_page) {
      cb_ret = reader->read_page (oggz, &og, reader->read_page_user_data);
    }
andre's avatar
andre committed
336 337

#if 0
338 339 340
    /* bitrate tracking; add the header's bytes here, the body bytes
       are done by packet above */
    vf->bittrack+=og.header_len*8;
andre's avatar
andre committed
341 342
#endif

343
    ogg_stream_pagein(os, &og);
andre's avatar
andre committed
344 345
  }

346
  return cb_ret;
andre's avatar
andre committed
347 348 349 350 351 352 353 354
}

long
oggz_read (OGGZ * oggz, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, bytes_read = 1, remaining = n, nread = 0;
355
  int cb_ret = 0;
andre's avatar
andre committed
356 357 358 359 360 361 362 363 364

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

  reader = &oggz->x.reader;

365
  cb_ret = oggz_read_sync (oggz);
andre's avatar
andre committed
366

367
#if 0
368
  if (cb_ret == OGGZ_READ_EMPTY) {
369 370
    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
371 372 373 374 375 376 377
    else {
#if 0
      printf ("oggz_read: EMPTY, current_unit %ld != 0\n",
	      reader->current_unit);
      return 0;
#endif
    }
378
  }
379
#endif
380

381 382
  while (cb_ret != OGGZ_STOP_ERR && cb_ret != OGGZ_STOP_OK &&
	 bytes_read > 0 && remaining > 0) {
383
    bytes = MIN (remaining, CHUNKSIZE);
andre's avatar
andre committed
384
    buffer = ogg_sync_buffer (&reader->ogg_sync, bytes);
385
    if ((bytes_read = (long) oggz_io_read (oggz, buffer, bytes)) == 0) {
386 387 388 389
      /* schyeah! */
    }
    if (bytes_read == OGGZ_ERR_SYSTEM) {
      return OGGZ_ERR_SYSTEM;
andre's avatar
andre committed
390 391
    }

conrad's avatar
 
conrad committed
392 393 394 395 396 397 398 399
    if (bytes_read > 0) {
      ogg_sync_wrote (&reader->ogg_sync, bytes_read);
      
      remaining -= bytes_read;
      nread += bytes_read;
      
      cb_ret = oggz_read_sync (oggz);
    }
andre's avatar
andre committed
400 401
  }

402
  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
403

404
  /* Don't return 0 unless it's actually an EOF condition */
405
  if (nread == 0) {
conrad's avatar
conrad committed
406 407 408 409 410 411 412
    switch (bytes_read) {
    case OGGZ_ERR_IO_AGAIN:
    case OGGZ_ERR_SYSTEM:
      return bytes_read; break;
    default: break;
    }

413
    switch (cb_ret) {
414 415 416 417 418
    case OGGZ_CONTINUE: case OGGZ_READ_EMPTY: 
#ifdef DEBUG
      printf ("oggz_read: nread==0, cb_ret==%d, returning 0\n", cb_ret);
#endif
      return 0; break;
419 420 421 422
    case OGGZ_STOP_ERR: return OGGZ_ERR_READ_STOP_ERR; break;
    case OGGZ_STOP_OK: default: return OGGZ_ERR_READ_STOP_OK; break;
    }
  }
423

andre's avatar
andre committed
424 425 426 427 428 429 430 431 432 433
  return nread;
}

/* generic */
long
oggz_read_input (OGGZ * oggz, unsigned char * buf, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, remaining = n, nread = 0;
434
  int cb_ret = 0;
andre's avatar
andre committed
435 436 437 438 439 440 441 442 443

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

  reader = &oggz->x.reader;

444 445
  cb_ret = oggz_read_sync (oggz);

446
#if 0
447
  if (cb_ret == OGGZ_READ_EMPTY) {
448 449 450 451
    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
    else return 0;
  }
452
#endif
conrad's avatar
conrad committed
453

454
  while (cb_ret != -1 && cb_ret != 1 && /* !oggz->eos && */ remaining > 0) {
andre's avatar
andre committed
455 456 457 458 459 460 461 462 463
    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;

464
    cb_ret = oggz_read_sync (oggz);
andre's avatar
andre committed
465 466
  }

467
  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
468

469
  /* Don't return 0 unless it's actually an EOF condition */
470 471
  if (nread == 0) {
    switch (cb_ret) {
472 473 474 475 476 477 478
    case OGGZ_CONTINUE: return 0; break;
    case OGGZ_READ_EMPTY:
#ifdef DEBUG
      printf ("oggz_read_input: OUT EMPTY\n");
#endif
      return OGGZ_ERR_READ_STOP_OK;
      break;
479 480 481 482
    case OGGZ_STOP_ERR: return OGGZ_ERR_READ_STOP_ERR; break;
    case OGGZ_STOP_OK: default: return OGGZ_ERR_READ_STOP_OK; break;
    }
  }
483

andre's avatar
andre committed
484 485 486
  return nread;
}

487
/* oggz_seek() (and oggz_purge()) related functions from here down */
andre's avatar
andre committed
488 489

/*
conrad's avatar
conrad committed
490
 * The typical usage is:
andre's avatar
andre committed
491 492 493 494
 *
 *   oggz_set_data_start (oggz, oggz_tell (oggz));
 */
int
conrad's avatar
conrad committed
495
oggz_set_data_start (OGGZ * oggz, oggz_off_t offset)
andre's avatar
andre committed
496 497 498 499 500 501 502 503 504 505
{
  if (oggz == NULL) return -1;

  if (offset < 0) return -1;

  oggz->offset_data_begin = offset;

  return 0;
}

conrad's avatar
conrad committed
506
static oggz_off_t
andre's avatar
andre committed
507 508
oggz_tell_raw (OGGZ * oggz)
{
conrad's avatar
conrad committed
509
  oggz_off_t offset_at;
andre's avatar
andre committed
510

511
  offset_at = oggz_io_tell (oggz);
andre's avatar
andre committed
512 513 514 515 516 517 518

  return offset_at;
}

/*
 * seeks and syncs
 */
conrad's avatar
conrad committed
519 520
static oggz_off_t
oggz_seek_raw (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
521 522
{
  OggzReader * reader = &oggz->x.reader;
conrad's avatar
conrad committed
523
  oggz_off_t offset_at;
andre's avatar
andre committed
524

525
  if (oggz_io_seek (oggz, offset, whence) == -1) {
andre's avatar
andre committed
526 527 528
    return -1;
  }

529
  offset_at = oggz_io_tell (oggz);
conrad's avatar
conrad committed
530

andre's avatar
andre committed
531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549
  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;
}

550 551 552 553 554 555
static void
oggz_reset_streams (OGGZ * oggz)
{
  oggz_vector_foreach (oggz->streams, oggz_stream_reset);
}

andre's avatar
andre committed
556
static long
557
oggz_reset_seek (OGGZ * oggz, oggz_off_t offset, ogg_int64_t unit, int whence)
andre's avatar
andre committed
558 559 560
{
  OggzReader * reader = &oggz->x.reader;

conrad's avatar
conrad committed
561
  oggz_off_t offset_at;
andre's avatar
andre committed
562 563 564 565 566 567 568 569 570 571 572 573 574 575 576

  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

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

  return offset_at;
}

577 578 579 580 581 582 583
static long
oggz_reset (OGGZ * oggz, oggz_off_t offset, ogg_int64_t unit, int whence)
{
  oggz_reset_streams (oggz);
  return oggz_reset_seek (oggz, offset, unit, whence);
}

584 585 586 587 588 589 590 591 592
int
oggz_purge (OGGZ * oggz)
{
  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

593 594 595
  oggz_reset_streams (oggz);

  if (oggz->file && oggz_reset (oggz, oggz->offset, -1, SEEK_SET) < 0) {
596 597 598 599 600 601
    return OGGZ_ERR_SYSTEM;
  }

  return 0;
}

andre's avatar
andre committed
602 603 604 605 606 607 608 609
/*
 * 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
610
static oggz_off_t
andre's avatar
andre committed
611 612 613 614 615
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
616
  oggz_off_t page_offset = 0, ret;
andre's avatar
andre committed
617 618 619 620 621 622 623 624 625
  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);
626
      if ((bytes = (long) oggz_io_read (oggz, buffer, CHUNKSIZE)) == 0) {
627 628
	/* schyeah! */
      }
629
      if (bytes == OGGZ_ERR_SYSTEM) {
conrad's avatar
conrad committed
630 631
	  /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
	  return -1;
andre's avatar
andre committed
632 633
      }

634 635 636 637 638 639 640
      if (bytes == 0) {
	return -2;
      } else if (oggz->file && feof (oggz->file)) {
	clearerr (oggz->file);
	return -2;
      }

andre's avatar
andre committed
641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669
      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
670
static oggz_off_t
andre's avatar
andre committed
671 672
oggz_get_next_start_page (OGGZ * oggz, ogg_page * og)
{
conrad's avatar
conrad committed
673
  oggz_off_t page_offset;
andre's avatar
andre committed
674 675
  int found = 0;

colinw's avatar
colinw committed
676
  do {
andre's avatar
andre committed
677 678 679 680 681 682 683 684 685 686 687
    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;
  }
colinw's avatar
colinw committed
688
  while (!found);
andre's avatar
andre committed
689 690 691 692

  return page_offset;
}

conrad's avatar
conrad committed
693
static oggz_off_t
andre's avatar
andre committed
694 695 696
oggz_get_prev_start_page (OGGZ * oggz, ogg_page * og,
			 ogg_int64_t * granule, long * serialno)
{
conrad's avatar
conrad committed
697 698
  oggz_off_t offset_at, offset_start;
  oggz_off_t page_offset, prev_offset = 0;
andre's avatar
andre committed
699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767
  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
768
static oggz_off_t
andre's avatar
andre committed
769
oggz_scan_for_page (OGGZ * oggz, ogg_page * og, ogg_int64_t unit_target,
conrad's avatar
conrad committed
770
		   oggz_off_t offset_begin, oggz_off_t offset_end)
andre's avatar
andre committed
771
{
conrad's avatar
conrad committed
772 773
  oggz_off_t offset_at, offset_next;
  oggz_off_t offset_prev = -1;
andre's avatar
andre committed
774 775 776 777 778 779 780 781
  ogg_int64_t granule_at;
  ogg_int64_t unit_at;
  long serialno;

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

colinw's avatar
colinw committed
782
  for ( ; ; ) {
andre's avatar
andre committed
783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865
    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;
}

866 867
#define GUESS_MULTIPLIER (1<<16)

andre's avatar
andre committed
868 869 870 871
static long
oggz_seek_set (OGGZ * oggz, ogg_int64_t unit_target)
{
  OggzReader * reader = &oggz->x.reader;
conrad's avatar
conrad committed
872
  int fd;
andre's avatar
andre committed
873
  struct stat statbuf;
conrad's avatar
conrad committed
874
  oggz_off_t offset_orig, offset_at, offset_guess;
875
  oggz_off_t offset_begin, offset_end = -1, offset_next;
andre's avatar
andre committed
876 877 878
  ogg_int64_t granule_at;
  ogg_int64_t unit_at, unit_begin = 0, unit_end = -1;
  long serialno;
879
  ogg_int64_t guess_ratio;
andre's avatar
andre committed
880 881 882 883 884 885
  ogg_page * og;

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

886
  if (unit_target > 0 && !oggz_has_metrics (oggz)) {
andre's avatar
andre committed
887 888 889 890
    /* No metric defined */
    return -1;
  }

891
  if (oggz->file != NULL) {
892 893 894 895
    if ((fd = fileno (oggz->file)) == -1) {
      /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
      return -1;
    }
andre's avatar
andre committed
896

897 898 899 900
    if (fstat (fd, &statbuf) == -1) {
      /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
      return -1;
    }
andre's avatar
andre committed
901

902 903 904 905
    if (oggz_stat_regular (statbuf.st_mode)) {
      offset_end = statbuf.st_size;
    } else {
      /*oggz_set_error (oggz, OGGZ_ERR_NOSEEK);*/
906 907 908

      /* XXX: should be able to just carry on and guess, as per io */
      /*return -1;*/
909
    }
910
  } else {
911 912 913
    oggz_off_t offset_save;

    if (oggz->io == NULL || oggz->io->seek == NULL) {
914 915
      /* No file, and no io seek method */
      return -1;
916 917 918 919 920 921 922 923 924 925 926
    }

    /* Get the offset of the end by querying the io seek method */
    offset_save = oggz_io_tell (oggz);
    if (oggz_io_seek (oggz, 0, SEEK_END) == -1) {
      return -1;
    }
    offset_end = oggz_io_tell (oggz);
    if (oggz_io_seek (oggz, offset_save, SEEK_SET) == -1) {
      return -1; /* fubar */
    }
927
  }
andre's avatar
andre committed
928 929

  if (unit_target == reader->current_unit) {
930
    return (long)reader->current_unit;
andre's avatar
andre committed
931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955
  }

  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;

colinw's avatar
colinw committed
956
  for ( ; ; ) {
andre's avatar
andre committed
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973

#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 =
974 975
	  GUESS_MULTIPLIER * (unit_target - unit_begin) /
	  (unit_at - unit_begin);
andre's avatar
andre committed
976 977

#ifdef DEBUG
978
	printf ("\nguess_ratio %ld = (%ld - %ld) / (%ld - %ld)\n",
andre's avatar
andre committed
979 980 981 982
		guess_ratio, unit_target, unit_begin, unit_at, unit_begin);
#endif

	offset_guess = offset_begin +
983 984
	  (oggz_off_t)(((offset_at - offset_begin) * guess_ratio) /
		       GUESS_MULTIPLIER);
andre's avatar
andre committed
985 986 987 988 989 990 991 992 993
      }
    } else if (unit_end <= unit_begin) {
#ifdef DEBUG
      printf ("unit_end <= unit_begin\n");
#endif
      break;
    } else {
#if 1
      guess_ratio =
994 995
	GUESS_MULTIPLIER * (unit_target - unit_begin) /
	(unit_end - unit_begin);
andre's avatar
andre committed
996 997

      offset_guess = offset_begin +
998 999
	(oggz_off_t)(((offset_end - offset_begin) * guess_ratio) /
		     GUESS_MULTIPLIER);
andre's avatar
andre committed
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 1069 1070 1071 1072 1073 1074 1075 1076

      /*
      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;

1077
  return (long)reader->current_unit;
andre's avatar
andre committed
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091

 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
1092
  oggz_off_t offset_orig, offset_at, offset_end;
andre's avatar
andre committed
1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112
  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;
  }
1113

andre's avatar
andre committed
1114 1115 1116 1117 1118 1119 1120 1121 1122
#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
1123
oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
1124 1125 1126 1127 1128 1129 1130 1131
{
  ogg_int64_t units = -1;

  if (oggz == NULL) return -1;

  if (oggz->flags & OGGZ_WRITE) {
    return -1;
  }
1132

andre's avatar
andre committed
1133 1134
  if (offset == 0) units = 0;

conrad's avatar
conrad committed
1135
  return (off_t)oggz_reset (oggz, offset, units, whence);
andre's avatar
andre committed
1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148
}

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;
  }

1149
  if (!oggz_has_metrics (oggz)) {
andre's avatar
andre committed
1150 1151 1152 1153 1154 1155 1156
    return -1;
  }

  switch (whence) {
  case SEEK_SET:
    return oggz_seek_set (oggz, units);
    break;
1157
  case SEEK_CUR:
andre's avatar
andre committed
1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187
    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"

1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199
OGGZ *
oggz_read_init (OGGZ * oggz)
{
  return NULL;
}

OGGZ *
oggz_read_close (OGGZ * oggz)
{
  return NULL;
}

andre's avatar
andre committed
1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 1212 1213 1214 1215 1216 1217 1218 1219
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
1220
oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
andre's avatar
andre committed
1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 1232 1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243
{
  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