oggz_read.c 26.8 KB
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/*
   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>
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#ifdef HAVE_UNISTD_H
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#include <unistd.h>
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#endif

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#include <fcntl.h>
#include <errno.h>
#include <string.h>
#include <time.h>

#include <ogg/ogg.h>

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#include "oggz_compat.h"
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#include "oggz_private.h"

/*#define DEBUG*/

/*#define DEBUG_BY_READING_PAGES*/

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#define CHUNKSIZE 65536
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#define OGGZ_READ_EMPTY (-404)
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#define oggz_off_t long

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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;

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  reader->read_page = NULL;
  reader->read_page_user_data = NULL;

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  reader->current_unit = 0;

  return oggz;
}

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

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  ogg_stream_clear (&reader->ogg_stream);
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  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);
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#if 0
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    if (stream == NULL) return OGGZ_ERR_BAD_SERIALNO;
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#else
    if (stream == NULL)
      stream = oggz_add_stream (oggz, serialno);
#endif
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    stream->read_packet = read_packet;
    stream->read_user_data = user_data;
  }

  return 0;
}

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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;
}

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/*
 * 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
 */
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static oggz_off_t
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oggz_get_next_page_7 (OGGZ * oggz, ogg_page * og)
{
  OggzReader * reader = &oggz->x.reader;
#if _UNMODIFIED
  char * buffer;
#endif
  long bytes = 0, more;
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  oggz_off_t page_offset = 0, ret;
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  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);
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      if ((bytes = oggz_io_read (oggz, buffer, CHUNKSIZE)) == 0) {
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#if 0
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	if (ferror (oggz->file)) {
	  oggz_set_error (oggz, OGGZ_ERR_SYSTEM);
	  return -1;
	}
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#endif
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      }

      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) {
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    oggz->offset = oggz_io_tell (oggz) - bytes + page_offset;
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    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;
}

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static int
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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;

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  int cb_ret = 0;

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

  /* handle one packet.  Try to fetch it from current stream state */
  /* extract packets from page */
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  while(cb_ret == 0){
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    if (reader->current_serialno != -1) {
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    /* 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;
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      serialno = reader->current_serialno;
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      stream = oggz_get_stream (oggz, serialno);
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      if (stream == NULL) {
	/* new stream ... check bos etc. */
	if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	  /* error -- could not add stream */
	  return -7;
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	}
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      }
      os = &stream->ogg_stream;
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      result = ogg_stream_packetout(os, op);
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      if(result == -1) {
	/* hole in the data. */
	return -7;
      }
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      if(result > 0){
	/* got a packet.  process it */
	granulepos = op->granulepos;
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	if (!stream->metric && (oggz->flags & OGGZ_AUTO)) {
	  oggz_auto (oggz, op, serialno, NULL);
	}
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#if 0 /* set unit on last packet of page */
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	if ((oggz->metric || stream->metric) && granulepos != -1) {
	  reader->current_unit = oggz_get_unit (oggz, serialno, granulepos);
	}
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#endif

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	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);
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	}
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      }
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      else
	break;
    }
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    }
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    /* If we've got a stop already, don't read more data in */
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    if (cb_ret == OGGZ_STOP_OK || cb_ret == OGGZ_STOP_ERR) return cb_ret;
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    if(oggz_get_next_page_7 (oggz, &og) < 0)
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      return OGGZ_READ_EMPTY; /* eof. leave uninitialized */
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    serialno = ogg_page_serialno (&og);
    reader->current_serialno = serialno; /* XXX: maybe not necessary */

    stream = oggz_get_stream (oggz, serialno);
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    if (stream == NULL) {
      /* new stream ... check bos etc. */
      if ((stream = oggz_add_stream (oggz, serialno)) == NULL) {
	/* error -- could not add stream */
	return -7;
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      }
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    }
    os = &stream->ogg_stream;
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    {
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      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;
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      }
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    }
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    if (reader->read_page) {
      cb_ret = reader->read_page (oggz, &og, reader->read_page_user_data);
    }
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#if 0
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    /* bitrate tracking; add the header's bytes here, the body bytes
       are done by packet above */
    vf->bittrack+=og.header_len*8;
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#endif

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    ogg_stream_pagein(os, &og);
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  }

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  return cb_ret;
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}

long
oggz_read (OGGZ * oggz, long n)
{
  OggzReader * reader;
  char * buffer;
  long bytes, bytes_read = 1, remaining = n, nread = 0;
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  int cb_ret = 0;
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  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

  reader = &oggz->x.reader;

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  cb_ret = oggz_read_sync (oggz);
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#if 0
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  if (cb_ret == OGGZ_READ_EMPTY) {
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    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
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    else {
#if 0
      printf ("oggz_read: EMPTY, current_unit %ld != 0\n",
	      reader->current_unit);
      return 0;
#endif
    }
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  }
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#endif
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  while (cb_ret != OGGZ_STOP_ERR && cb_ret != OGGZ_STOP_OK &&
	 bytes_read > 0 && remaining > 0) {
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    bytes = MIN (remaining, CHUNKSIZE);
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    buffer = ogg_sync_buffer (&reader->ogg_sync, bytes);
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    if ((bytes_read = (long) oggz_io_read (oggz, buffer, bytes)) == 0) {
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      /* schyeah! */
    }
    if (bytes_read == OGGZ_ERR_SYSTEM) {
      return OGGZ_ERR_SYSTEM;
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    }

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    if (bytes_read > 0) {
      ogg_sync_wrote (&reader->ogg_sync, bytes_read);
      
      remaining -= bytes_read;
      nread += bytes_read;
      
      cb_ret = oggz_read_sync (oggz);
    }
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  }

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  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
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  /* Don't return 0 unless it's actually an EOF condition */
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  if (nread == 0) {
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    switch (bytes_read) {
    case OGGZ_ERR_IO_AGAIN:
    case OGGZ_ERR_SYSTEM:
      return bytes_read; break;
    default: break;
    }

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    switch (cb_ret) {
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    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;
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    case OGGZ_STOP_ERR: return OGGZ_ERR_READ_STOP_ERR; break;
    case OGGZ_STOP_OK: default: return OGGZ_ERR_READ_STOP_OK; break;
    }
  }
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  return nread;
}

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

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

  reader = &oggz->x.reader;

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  cb_ret = oggz_read_sync (oggz);

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#if 0
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  if (cb_ret == OGGZ_READ_EMPTY) {
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    /* If there's nothing to read yet, don't return 0 (eof) */
    if (reader->current_unit == 0) cb_ret = 0;
    else return 0;
  }
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#endif
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  while (cb_ret != -1 && cb_ret != 1 && /* !oggz->eos && */ remaining > 0) {
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    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;

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    cb_ret = oggz_read_sync (oggz);
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  }

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  if (cb_ret == OGGZ_STOP_ERR) oggz_purge (oggz);
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  /* Don't return 0 unless it's actually an EOF condition */
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  if (nread == 0) {
    switch (cb_ret) {
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    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;
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    case OGGZ_STOP_ERR: return OGGZ_ERR_READ_STOP_ERR; break;
    case OGGZ_STOP_OK: default: return OGGZ_ERR_READ_STOP_OK; break;
    }
  }
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  return nread;
}

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/* oggz_seek() (and oggz_purge()) related functions from here down */
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/*
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 * The typical usage is:
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 *
 *   oggz_set_data_start (oggz, oggz_tell (oggz));
 */
int
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oggz_set_data_start (OGGZ * oggz, oggz_off_t offset)
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{
  if (oggz == NULL) return -1;

  if (offset < 0) return -1;

  oggz->offset_data_begin = offset;

  return 0;
}

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static oggz_off_t
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oggz_tell_raw (OGGZ * oggz)
{
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  oggz_off_t offset_at;
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  offset_at = oggz_io_tell (oggz);
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  return offset_at;
}

/*
 * seeks and syncs
 */
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static oggz_off_t
oggz_seek_raw (OGGZ * oggz, oggz_off_t offset, int whence)
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{
  OggzReader * reader = &oggz->x.reader;
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  oggz_off_t offset_at;
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  if (oggz_io_seek (oggz, offset, whence) == -1) {
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    return -1;
  }

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  offset_at = oggz_io_tell (oggz);
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  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;
}

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static void
oggz_reset_streams (OGGZ * oggz)
{
  oggz_vector_foreach (oggz->streams, oggz_stream_reset);
}

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static long
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oggz_reset_seek (OGGZ * oggz, oggz_off_t offset, ogg_int64_t unit, int whence)
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{
  OggzReader * reader = &oggz->x.reader;

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  oggz_off_t offset_at;
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  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;
}

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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);
}

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int
oggz_purge (OGGZ * oggz)
{
  if (oggz == NULL) return OGGZ_ERR_BAD_OGGZ;

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

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  oggz_reset_streams (oggz);

  if (oggz->file && oggz_reset (oggz, oggz->offset, -1, SEEK_SET) < 0) {
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    return OGGZ_ERR_SYSTEM;
  }

  return 0;
}

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/*
 * 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
 */
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static oggz_off_t
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oggz_get_next_page (OGGZ * oggz, ogg_page * og)
{
  OggzReader * reader = &oggz->x.reader;
  char * buffer;
  long bytes = 0, more;
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  oggz_off_t page_offset = 0, ret;
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  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);
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      if ((bytes = (long) oggz_io_read (oggz, buffer, CHUNKSIZE)) == 0) {
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	/* schyeah! */
      }
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      if (bytes == OGGZ_ERR_SYSTEM) {
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	  /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
	  return -1;
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      }

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      if (bytes == 0) {
	return -2;
      } else if (oggz->file && feof (oggz->file)) {
	clearerr (oggz->file);
	return -2;
      }

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      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;
}

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static oggz_off_t
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oggz_get_next_start_page (OGGZ * oggz, ogg_page * og)
{
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  oggz_off_t page_offset;
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  int found = 0;

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  do {
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    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;
  }
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  while (!found);
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  return page_offset;
}

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static oggz_off_t
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oggz_get_prev_start_page (OGGZ * oggz, ogg_page * og,
			 ogg_int64_t * granule, long * serialno)
{
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  oggz_off_t offset_at, offset_start;
  oggz_off_t page_offset, prev_offset = 0;
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  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;
}

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static oggz_off_t
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oggz_scan_for_page (OGGZ * oggz, ogg_page * og, ogg_int64_t unit_target,
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		   oggz_off_t offset_begin, oggz_off_t offset_end)
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{
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  oggz_off_t offset_at, offset_next;
  oggz_off_t offset_prev = -1;
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  ogg_int64_t granule_at;
  ogg_int64_t unit_at;
  long serialno;

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

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  for ( ; ; ) {
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    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;
}

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#define GUESS_MULTIPLIER (1<<16)

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static long
oggz_seek_set (OGGZ * oggz, ogg_int64_t unit_target)
{
  OggzReader * reader = &oggz->x.reader;
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  int fd;
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  struct stat statbuf;
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  oggz_off_t offset_orig, offset_at, offset_guess;
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  oggz_off_t offset_begin, offset_end = -1, offset_next;
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  ogg_int64_t granule_at;
  ogg_int64_t unit_at, unit_begin = 0, unit_end = -1;
  long serialno;
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  ogg_int64_t guess_ratio;
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  ogg_page * og;

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

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

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  if (oggz->file != NULL) {
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    if ((fd = fileno (oggz->file)) == -1) {
      /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
      return -1;
    }
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    if (fstat (fd, &statbuf) == -1) {
      /*oggz_set_error (oggz, OGGZ_ERR_SYSTEM);*/
      return -1;
    }
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    if (oggz_stat_regular (statbuf.st_mode)) {
      offset_end = statbuf.st_size;
    } else {
      /*oggz_set_error (oggz, OGGZ_ERR_NOSEEK);*/
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      /* XXX: should be able to just carry on and guess, as per io */
      /*return -1;*/
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    }
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  } else {
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    oggz_off_t offset_save;

    if (oggz->io == NULL || oggz->io->seek == NULL) {
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      /* No file, and no io seek method */
      return -1;
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    }

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

  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;

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  for ( ; ; ) {
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#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 =
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	  GUESS_MULTIPLIER * (unit_target - unit_begin) /
	  (unit_at - unit_begin);
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#ifdef DEBUG
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	printf ("\nguess_ratio %ld = (%ld - %ld) / (%ld - %ld)\n",
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		guess_ratio, unit_target, unit_begin, unit_at, unit_begin);
#endif

	offset_guess = offset_begin +
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	  (oggz_off_t)(((offset_at - offset_begin) * guess_ratio) /
		       GUESS_MULTIPLIER);
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      }
    } else if (unit_end <= unit_begin) {
#ifdef DEBUG
      printf ("unit_end <= unit_begin\n");
#endif
      break;
    } else {
#if 1
      guess_ratio =
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	GUESS_MULTIPLIER * (unit_target - unit_begin) /
	(unit_end - unit_begin);
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      offset_guess = offset_begin +
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	(oggz_off_t)(((offset_end - offset_begin) * guess_ratio) /
		     GUESS_MULTIPLIER);
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      /*
      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;

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  return (long)reader->current_unit;
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 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)
{
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  oggz_off_t offset_orig, offset_at, offset_end;
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  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;
  }
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#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
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oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
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{
  ogg_int64_t units = -1;

  if (oggz == NULL) return -1;

  if (oggz->flags & OGGZ_WRITE) {
    return -1;
  }
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  if (offset == 0) units = 0;

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  return (off_t)oggz_reset (oggz, offset, units, whence);
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}

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;
  }

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  if (!oggz_has_metrics (oggz)) {
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    return -1;
  }

  switch (whence) {
  case SEEK_SET:
    return oggz_seek_set (oggz, units);
    break;
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  case SEEK_CUR:
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    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"

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

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

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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
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oggz_seek (OGGZ * oggz, oggz_off_t offset, int whence)
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{
  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