oggz_read.c 19 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
#include "oggz_private.h"

63 64
/* #define DEBUG */
/* #define DEBUG_VERBOSE */
andre's avatar
andre committed
65

66
#define CHUNKSIZE 65536
andre's avatar
andre committed
67

68
#define OGGZ_READ_EMPTY (-404)
69

andre's avatar
andre committed
70 71 72 73 74 75 76 77 78 79 80 81
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;

conrad's avatar
conrad committed
82 83 84
  reader->read_page = NULL;
  reader->read_page_user_data = NULL;

andre's avatar
andre committed
85 86 87 88 89 90 91 92 93 94
  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
  ogg_sync_clear (&reader->ogg_sync);

  return oggz;
}

int
oggz_set_read_callback (OGGZ * oggz, long serialno,
conrad's avatar
conrad committed
103
                        OggzReadPacket read_packet, void * user_data)
andre's avatar
andre committed
104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120
{
  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
int
136
oggz_set_read_page (OGGZ * oggz, long serialno, OggzReadPage read_page,
conrad's avatar
conrad committed
137
                    void * user_data)
138 139
{
  OggzReader * reader;
140
  oggz_stream_t * stream;
141 142 143 144 145 146 147 148 149

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

  reader =  &oggz->x.reader;

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

150 151 152 153 154 155 156 157 158 159 160 161 162 163 164
  if (serialno == -1) {
    reader->read_page = read_page;
    reader->read_page_user_data = user_data;
  } else {
    stream = oggz_get_stream (oggz, serialno);
#if 0
    if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
#else
    if (stream == NULL)
      stream = oggz_add_stream (oggz, serialno);
#endif

    stream->read_page = read_page;
    stream->read_page_user_data = user_data;
  }
165 166 167 168

  return 0;
}

andre's avatar
andre committed
169 170 171 172 173 174 175 176 177 178
/*
 * 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
179
static oggz_off_t
andre's avatar
andre committed
180 181 182 183 184 185 186
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
187
  oggz_off_t page_offset = 0, ret;
andre's avatar
andre committed
188 189 190 191 192 193 194 195 196
  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);
197
      if ((bytes = oggz_io_read (oggz, buffer, CHUNKSIZE)) == 0) {
198
#if 0
conrad's avatar
conrad committed
199 200 201 202
  if (ferror (oggz->file)) {
    oggz_set_error (oggz, OGGZ_ERR_SYSTEM);
    return -1;
  }
203
#endif
andre's avatar
andre committed
204 205 206
      }

      if (bytes == 0) {
conrad's avatar
conrad committed
207
        return -2;
andre's avatar
andre committed
208 209 210 211 212 213 214
      }

      ogg_sync_wrote(&reader->ogg_sync, bytes);
#else
      return -2;
#endif
    } else if (more < 0) {
215
#ifdef DEBUG_VERBOSE
andre's avatar
andre committed
216 217 218 219
      printf ("get_next_page: skipped %ld bytes\n", -more);
#endif
      page_offset -= more;
    } else {
220
#ifdef DEBUG_VERBOSE
andre's avatar
andre committed
221 222 223 224 225 226 227 228 229
      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) {
230
    oggz->offset = oggz_io_tell (oggz) - bytes + page_offset;
andre's avatar
andre committed
231 232 233 234 235 236 237 238 239 240
    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;
}

241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300
typedef struct {
  ogg_packet      packet;
  ogg_int64_t     calced_granulepos;
  oggz_stream_t * stream;
  OggzReader    * reader;
  OGGZ          * oggz;
  long            serialno;
} OggzBufferedPacket;

OggzBufferedPacket *
oggz_read_new_pbuffer_entry(OGGZ *oggz, ogg_packet *packet, 
            ogg_int64_t granulepos, long serialno, oggz_stream_t * stream, 
            OggzReader *reader) {

  OggzBufferedPacket *p = malloc(sizeof(OggzBufferedPacket));
  memcpy(&(p->packet), packet, sizeof(ogg_packet));
  p->packet.packet = malloc(packet->bytes);
  memcpy(p->packet.packet, packet->packet, packet->bytes);

  p->calced_granulepos = granulepos;
  p->stream = stream;
  p->serialno = serialno;
  p->reader = reader;
  p->oggz = oggz;

  return p;
}

void
oggz_read_free_pbuffer_entry(OggzBufferedPacket *p) {
  
  free(p->packet.packet);
  free(p);

}

OggzDListIterResponse
oggz_read_update_gp(void *elem) {

  OggzBufferedPacket *p = (OggzBufferedPacket *)elem;

  if (p->calced_granulepos == -1 && p->stream->last_granulepos != -1) {
    int content = oggz_stream_get_content(p->oggz, p->serialno);
    p->calced_granulepos = 
      oggz_auto_calculate_gp_backwards(content, p->stream->last_granulepos,
      p->stream, &(p->packet), p->stream->last_packet);
      
    p->stream->last_granulepos = p->calced_granulepos;
    p->stream->last_packet = &(p->packet);
  }

  return DLIST_ITER_CONTINUE;

}

OggzDListIterResponse
oggz_read_deliver_packet(void *elem) {

  OggzBufferedPacket *p = (OggzBufferedPacket *)elem;
  ogg_int64_t gp_stored;
301
  ogg_int64_t unit_stored;
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

  if (p->calced_granulepos == -1) {
    return DLIST_ITER_CANCEL;
  }

  gp_stored = p->reader->current_granulepos;
  unit_stored = p->reader->current_unit;

  p->reader->current_granulepos = p->calced_granulepos;

  p->reader->current_unit =
    oggz_get_unit (p->oggz, p->serialno, p->calced_granulepos);

  if (p->stream->read_packet) {
    p->stream->read_packet(p->oggz, &(p->packet), p->serialno, 
            p->stream->read_user_data);
  } else if (p->reader->read_packet) {
    p->reader->read_packet(p->oggz, &(p->packet), p->serialno, 
            p->reader->read_user_data);
  }

  p->reader->current_granulepos = gp_stored;
  p->reader->current_unit = unit_stored;

  oggz_read_free_pbuffer_entry(p);

  return DLIST_ITER_CONTINUE;
}

331
static int
andre's avatar
andre committed
332 333 334 335 336 337 338 339 340 341 342 343
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;

344 345
  int cb_ret = 0;

andre's avatar
andre committed
346 347 348 349 350
  /*os = &reader->ogg_stream;*/
  op = &packet;

  /* handle one packet.  Try to fetch it from current stream state */
  /* extract packets from page */
351
  while(cb_ret == 0) {
andre's avatar
andre committed
352 353

    if (reader->current_serialno != -1) {
354 355
    /* process a packet if we can.  If the machine isn't loaded,
       neither is a page */
356 357 358
      while(cb_ret == 0) {
        ogg_int64_t granulepos;
        int result;
andre's avatar
andre committed
359

360
        serialno = reader->current_serialno;
andre's avatar
andre committed
361

362
        stream = oggz_get_stream (oggz, serialno);
363

364
        if (stream == NULL) {
conrad's avatar
conrad committed
365 366 367 368 369
          /* new stream ... check bos etc. */
          if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
            /* error -- could not add stream */
            return -7;
          }
370 371
        }
        os = &stream->ogg_stream;
372

373
        result = ogg_stream_packetout(os, op);
andre's avatar
andre committed
374

375
        if(result == -1) {
376
#ifdef DEBUG
conrad's avatar
conrad committed
377
          printf ("oggz_read_sync: hole in the data\n");
378
#endif
379 380 381 382 383 384 385 386 387 388 389 390 391 392 393
          result = ogg_stream_packetout(os, op);
          if (result == -1) {
#ifdef DEBUG
            /*
             * libogg flags "holes in the data" (which are really 
             * inconsistencies in the page sequence number) by returning
             * -1.  This occurs in some files and pretty much doesn't matter,
             *  so we silently swallow the notification and reget the packet.
             *  If the result is *still* -1 then something strange is happening.
             */
            printf ("shouldn't get here");
#endif
            return -7;
          }
        }
andre's avatar
andre committed
394

395 396
        if(result > 0){
          int content;
397 398

          stream->packetno++;
399
          
conrad's avatar
conrad committed
400 401
          /* got a packet.  process it */
          granulepos = op->granulepos;
andre's avatar
andre committed
402

403
          content = oggz_stream_get_content(oggz, serialno);
404
  
405 406 407
          /*
           * if we have no metrics for this stream yet, then generate them
           */      
conrad's avatar
conrad committed
408
          if 
409 410 411 412 413 414
          (
            (!stream->metric || (content == OGGZ_CONTENT_SKELETON)) 
            && 
            (oggz->flags & OGGZ_AUTO)
          ) 
          {
conrad's avatar
conrad committed
415 416
            oggz_auto_get_granulerate (oggz, op, serialno, NULL);
          }
417 418 419 420 421

          /* attempt to determine granulepos for this packet */
          if (oggz->flags & OGGZ_AUTO) {
            reader->current_granulepos = 
              oggz_auto_calculate_granulepos (content, granulepos, stream, op); 
422 423 424 425 426
            /* make sure that we accept any "real" gaps in the granulepos
             */
            if (granulepos != -1 && reader->current_granulepos < granulepos) {
              reader->current_granulepos = granulepos;
            }
427 428 429 430
          } else {
            reader->current_granulepos = granulepos;
          }
          stream->last_granulepos = reader->current_granulepos;
431
        
conrad's avatar
conrad committed
432 433
          /* set unit on last packet of page */
          if 
434 435 436 437
          (
            (oggz->metric || stream->metric) && reader->current_granulepos != -1
          ) 
          {
conrad's avatar
conrad committed
438 439 440 441
            reader->current_unit =
              oggz_get_unit (oggz, serialno, reader->current_granulepos);
          }

442 443 444
          if (stream->packetno == 1) {
            oggz_auto_read_comments (oggz, stream, serialno, op);
          }
445
          
446 447
          if (oggz->flags & OGGZ_AUTO) {
          
448
            /*
449 450 451
             * while we are getting invalid granulepos values, store the 
             * incoming packets in a dlist */
            if (reader->current_granulepos == -1) {
452
              OggzBufferedPacket *p = oggz_read_new_pbuffer_entry(
453 454
                                oggz, &packet, reader->current_granulepos, 
                                serialno, stream, reader);
455 456 457

              oggz_dlist_append(oggz->packet_buffer, p);
              continue;
458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482
            } else if (!oggz_dlist_is_empty(oggz->packet_buffer)) {
              /*
               * move backward through the list assigning gp values based upon
               * the granulepos we just recieved.  Then move forward through
               * the list delivering any packets at the beginning with valid
               * gp values
               */
              ogg_int64_t gp_stored = stream->last_granulepos;
              stream->last_packet = &packet;
              oggz_dlist_reverse_iter(oggz->packet_buffer, oggz_read_update_gp);
              oggz_dlist_deliter(oggz->packet_buffer, oggz_read_deliver_packet);

              /*
               * fix up the stream granulepos 
               */
              stream->last_granulepos = gp_stored;

              if (!oggz_dlist_is_empty(oggz->packet_buffer)) {
                OggzBufferedPacket *p = oggz_read_new_pbuffer_entry(
                                oggz, &packet, reader->current_granulepos, 
                                serialno, stream, reader);

                oggz_dlist_append(oggz->packet_buffer, p);
                continue;
              }
483 484 485
            }
          }

conrad's avatar
conrad committed
486 487 488 489 490 491 492
          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);
          }
493 494 495 496 497 498

          /* Mark this stream as having delivered a non b_o_s packet if so.
           * In the case where there is no packet reading callback, this is
           * also valid as the page reading callback has already been called.
           */
          if (!op->b_o_s) stream->delivered_non_b_o_s = 1;
499 500
        }
        else
conrad's avatar
conrad committed
501
          break;
andre's avatar
andre committed
502 503
      }
    }
504

505
    /* If we've got a stop already, don't read more data in */
506
    if (cb_ret == OGGZ_STOP_OK || cb_ret == OGGZ_STOP_ERR) return cb_ret;
andre's avatar
andre committed
507

508
    if(oggz_get_next_page_7 (oggz, &og) < 0)
509
      return OGGZ_READ_EMPTY; /* eof. leave uninitialized */
andre's avatar
andre committed
510

511 512 513 514
    serialno = ogg_page_serialno (&og);
    reader->current_serialno = serialno; /* XXX: maybe not necessary */

    stream = oggz_get_stream (oggz, serialno);
515

516 517 518
    if (stream == NULL) {
      /* new stream ... check bos etc. */
      if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
conrad's avatar
conrad committed
519 520
        /* error -- could not add stream */
        return -7;
andre's avatar
andre committed
521
      }
522

523
      /* identify stream type */
524
      oggz_auto_identify_page (oggz, &og, serialno);
525 526 527 528 529 530
    }
    else if (oggz_stream_get_content(oggz, serialno) == OGGZ_CONTENT_ANXDATA)
    {
      /*
       * re-identify ANXDATA streams as these are now content streams
       */
531
      oggz_auto_identify_page (oggz, &og, serialno);
532
    }
533
    
534
    os = &stream->ogg_stream;
andre's avatar
andre committed
535

536
    {
537 538 539
      ogg_int64_t granulepos;

      granulepos = ogg_page_granulepos (&og);
540
      stream->page_granulepos = granulepos;
541

542
      if ((oggz->metric || stream->metric) && granulepos != -1) {
543
       reader->current_unit = oggz_get_unit (oggz, serialno, granulepos);
544
      } else if (granulepos == 0) {
545
       reader->current_unit = 0;
andre's avatar
andre committed
546
      }
547
    }
548

549 550
    if (stream->read_page) {
      cb_ret =
conrad's avatar
conrad committed
551
        stream->read_page (oggz, &og, serialno, stream->read_page_user_data);
552
    } else if (reader->read_page) {
conrad's avatar
conrad committed
553 554
      cb_ret =
        reader->read_page (oggz, &og, serialno, reader->read_page_user_data);
555
    }
andre's avatar
andre committed
556 557

#if 0
558 559 560
    /* 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
561 562
#endif

563
    ogg_stream_pagein(os, &og);
andre's avatar
andre committed
564 565
  }

566
  return cb_ret;
andre's avatar
andre committed
567 568 569 570 571 572 573 574
}

long
oggz_read (OGGZ * oggz, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, bytes_read = 1, remaining = n, nread = 0;
575
  int cb_ret = 0;
andre's avatar
andre committed
576 577 578 579 580 581 582

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

583 584
  if ((cb_ret = oggz->cb_next) != OGGZ_CONTINUE) {
    oggz->cb_next = 0;
585
    return oggz_map_return_value_to_error (cb_ret);
586 587
  }

andre's avatar
andre committed
588 589
  reader = &oggz->x.reader;

590
  cb_ret = oggz_read_sync (oggz);
andre's avatar
andre committed
591

592
#if 0
593
  if (cb_ret == OGGZ_READ_EMPTY) {
594 595
    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
596 597 598
    else {
#if 0
      printf ("oggz_read: EMPTY, current_unit %ld != 0\n",
conrad's avatar
conrad committed
599
              reader->current_unit);
600 601 602
      return 0;
#endif
    }
603
  }
604
#endif
605

606
  while (cb_ret != OGGZ_STOP_ERR && cb_ret != OGGZ_STOP_OK &&
conrad's avatar
conrad committed
607
         bytes_read > 0 && remaining > 0) {
608
    bytes = MIN (remaining, CHUNKSIZE);
andre's avatar
andre committed
609
    buffer = ogg_sync_buffer (&reader->ogg_sync, bytes);
610
    if ((bytes_read = (long) oggz_io_read (oggz, buffer, bytes)) == 0) {
611 612 613 614
      /* schyeah! */
    }
    if (bytes_read == OGGZ_ERR_SYSTEM) {
      return OGGZ_ERR_SYSTEM;
andre's avatar
andre committed
615 616
    }

conrad's avatar
 
conrad committed
617 618 619 620 621 622 623 624
    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
625 626
  }

627
  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
628

629
  /* Don't return 0 unless it's actually an EOF condition */
630
  if (nread == 0) {
conrad's avatar
conrad committed
631 632 633 634 635 636 637
    switch (bytes_read) {
    case OGGZ_ERR_IO_AGAIN:
    case OGGZ_ERR_SYSTEM:
      return bytes_read; break;
    default: break;
    }

638 639 640 641 642
    if (cb_ret == OGGZ_READ_EMPTY) {
      return 0;
    } else {
      return oggz_map_return_value_to_error (cb_ret);
    }
643 644 645 646

  } else {
    if (cb_ret == OGGZ_READ_EMPTY) cb_ret = OGGZ_CONTINUE;
    oggz->cb_next = cb_ret;
647
  }
648

andre's avatar
andre committed
649 650 651 652 653 654 655 656 657 658
  return nread;
}

/* generic */
long
oggz_read_input (OGGZ * oggz, unsigned char * buf, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, remaining = n, nread = 0;
659
  int cb_ret = 0;
andre's avatar
andre committed
660 661 662 663 664 665 666

  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

667 668
  if ((cb_ret = oggz->cb_next) != OGGZ_CONTINUE) {
    oggz->cb_next = 0;
669
    return oggz_map_return_value_to_error (cb_ret);
670 671
  }

andre's avatar
andre committed
672 673
  reader = &oggz->x.reader;

674 675
  cb_ret = oggz_read_sync (oggz);

676
#if 0
677
  if (cb_ret == OGGZ_READ_EMPTY) {
678 679 680 681
    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
    else return 0;
  }
682
#endif
conrad's avatar
conrad committed
683

684
  while (cb_ret != OGGZ_STOP_ERR && cb_ret != OGGZ_STOP_OK  &&
conrad's avatar
conrad committed
685
         /* !oggz->eos && */ remaining > 0) {
andre's avatar
andre committed
686 687 688 689 690 691 692 693 694
    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;

695
    cb_ret = oggz_read_sync (oggz);
andre's avatar
andre committed
696 697
  }

698
  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
699

700
  if (nread == 0) {
701 702
    /* Don't return 0 unless it's actually an EOF condition */
    if (cb_ret == OGGZ_READ_EMPTY) {
703
      return OGGZ_ERR_STOP_OK;
704
    } else {
705
      return oggz_map_return_value_to_error (cb_ret);
706
    }
707 708 709
  } else {
    if (cb_ret == OGGZ_READ_EMPTY) cb_ret = OGGZ_CONTINUE;
    oggz->cb_next = cb_ret;
710
  }
711

andre's avatar
andre committed
712 713 714 715 716 717 718 719 720
  return nread;
}


#else /* OGGZ_CONFIG_READ */

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

721 722 723 724 725 726 727 728 729 730 731 732
OGGZ *
oggz_read_init (OGGZ * oggz)
{
  return NULL;
}

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

andre's avatar
andre committed
733 734
int
oggz_set_read_callback (OGGZ * oggz, long serialno,
conrad's avatar
conrad committed
735
                        OggzReadPacket read_packet, void * user_data)
andre's avatar
andre committed
736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752
{
  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;
}

#endif