/*
 *  avilib.c
 *
 *  Copyright (C) Thomas Östreich - June 2001
 *  multiple audio track support Copyright (C) 2002 Thomas Östreich 
 *
 *  Original code:
 *  Copyright (C) 1999 Rainer Johanni <Rainer@Johanni.de> 
 *
 *  This file is part of transcode, a video stream processing tool
 *      
 *  transcode is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2, or (at your option)
 *  any later version.
 *   
 *  transcode is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *   
 *  You should have received a copy of the GNU General Public License
 *  along with GNU Make; see the file COPYING.  If not, write to
 *  the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. 
 *
 */

#ifdef HAVE_CONFIG_H
#include "config.h"
#else 
#define PACKAGE "transcode"
#define VERSION "1.0.0"
#endif

#include "os.h"

#if defined(COMP_MSC) || defined(COMP_MINGW)
#include <io.h>
#define ftruncate _chsize
#define strncasecmp _strnicmp
#else // COMP_...
#include <unistd.h>
#endif

#include "avilib.h"
#include "xio.h"

#define INFO_LIST

// add a new riff chunk after XX MB
//#define NEW_RIFF_THRES (1900*1024*1024)
#define NEW_RIFF_THRES (1900*1024*1024)
//#define NEW_RIFF_THRES (10*1024*1024)

// Maximum number of indices per stream
#define NR_IXNN_CHUNKS 32


#define DEBUG_ODML
#undef DEBUG_ODML

/* The following variable indicates the kind of error */

long AVI_errno = 0;

#define MAX_INFO_STRLEN 64
static char id_str[MAX_INFO_STRLEN];

#define FRAME_RATE_SCALE 1000000

/*******************************************************************
 *                                                                 *
 *    Utilities for writing an AVI File                            *
 *                                                                 *
 *******************************************************************/

static ssize_t avi_read(int fd, char *buf, size_t len)
{
   ssize_t n = 0;
   ssize_t r = 0;

   while (r < len) {
      n = xio_read (fd, buf + r, len - r);
      if (n == 0)
	  break;
      if (n < 0) {
	  if (errno == EINTR)
	      continue;
	  else
	      break;
      } 

      r += n;
   }

   return r;
}

static ssize_t avi_write (int fd, char *buf, size_t len)
{
   ssize_t n = 0;
   ssize_t r = 0;

   while (r < len) {
      n = xio_write (fd, buf + r, len - r);
      if (n < 0)
         return n;
      
      r += n;
   }
   return r;
}

/* HEADERBYTES: The number of bytes to reserve for the header */

#define HEADERBYTES 2048

/* AVI_MAX_LEN: The maximum length of an AVI file, we stay a bit below
    the 2GB limit (Remember: 2*10^9 is smaller than 2 GB) */

#define AVI_MAX_LEN (UINT_MAX-(1<<20)*16-HEADERBYTES)

#define PAD_EVEN(x) ( ((x)+1) & ~1 )


/* Copy n into dst as a 4 or 2 byte, little endian number.
   Should also work on big endian machines */

static void long2str(unsigned char *dst, int32_t n)
{
   dst[0] = (n    )&0xff;
   dst[1] = (n>> 8)&0xff;
   dst[2] = (n>>16)&0xff;
   dst[3] = (n>>24)&0xff;
}

#ifdef WORDS_BIGENDIAN
static void short2str(unsigned char *dst, int32_t n)
{
   dst[0] = (n    )&0xff;
   dst[1] = (n>> 8)&0xff;
}
#endif

/* Convert a string of 4 or 2 bytes to a number,
   also working on big endian machines */

static uint64_t str2ullong(unsigned char *str)
{
   uint64_t r = (str[0] | (str[1]<<8) | (str[2]<<16) | (str[3]<<24));
   uint64_t s = (str[4] | (str[5]<<8) | (str[6]<<16) | (str[7]<<24));
   return ((s<<32)&0xffffffff00000000ULL)|(r&0xffffffffULL);
}

static uint32_t str2ulong(unsigned char *str)
{
   return ( str[0] | (str[1]<<8) | (str[2]<<16) | (str[3]<<24) );
}
static uint32_t str2ushort(unsigned char *str)
{
   return ( str[0] | (str[1]<<8) );
}

// bit 31 denotes a keyframe
static uint32_t str2ulong_len (unsigned char *str)
{
   return str2ulong(str) & 0x7fffffff;
}


// if bit 31 is 0, its a keyframe
static uint32_t str2ulong_key (unsigned char *str)
{
  uint32_t c = str2ulong(str);
  c &= 0x80000000;
  if (c == 0) return 0x10;
  else return 0;
}

/* Calculate audio sample size from number of bits and number of channels.
   This may have to be adjusted for eg. 12 bits and stereo */

static int avi_sampsize(avi_t *AVI, int j)
{
   int s;
   s = ((AVI->track[j].a_bits+7)/8)*AVI->track[j].a_chans;
   //   if(s==0) s=1; /* avoid possible zero divisions */
   if(s<4) s=4; /* avoid possible zero divisions */ 
   return s;
}

/* Add a chunk (=tag and data) to the AVI file,
   returns -1 on write error, 0 on success */

static int avi_add_chunk(avi_t *AVI, unsigned char *tag, unsigned char *data, int length)
{
   unsigned char c[8];
   char p=0;
   
   /* Copy tag and length int c, so that we need only 1 write system call
      for these two values */

   memcpy(c,tag,4);
   long2str(c+4,length);

   /* Output tag, length and data, restore previous position
      if the write fails */

   if( avi_write(AVI->fdes,(char *)c,8) != 8 ||
       avi_write(AVI->fdes,(char *)data,length) != length ||
       avi_write(AVI->fdes,&p,length&1) != (length&1)) // if len is uneven, write a pad byte
   {
      xio_lseek(AVI->fdes,AVI->pos,SEEK_SET);
      AVI_errno = AVI_ERR_WRITE;
      return -1;
   }

   /* Update file position */

   AVI->pos += 8 + PAD_EVEN(length);

   //fprintf(stderr, "pos=%lu %s\n", AVI->pos, tag);

   return 0;
}

#define OUTD(n) long2str(ix00+bl,n); bl+=4
#define OUTW(n) ix00[bl] = (n)&0xff; ix00[bl+1] = (n>>8)&0xff; bl+=2
#define OUTC(n) ix00[bl] = (n)&0xff; bl+=1
#define OUTS(s) memcpy(ix00+bl,s,4); bl+=4

// this does the physical writeout of the ix## structure
static int avi_ixnn_entry(avi_t *AVI, avistdindex_chunk *ch, avisuperindex_entry *en) 
{
    int bl, k;
    unsigned int max = ch->nEntriesInUse * sizeof (uint32_t) * ch->wLongsPerEntry + 24; // header
    char *ix00 = malloc (max);
    char dfcc[5];
    memcpy (dfcc, ch->fcc, 4);
    dfcc[4] = 0;

    bl = 0;

    if (en) {
	en->qwOffset = AVI->pos;
	en->dwSize = max;
	//en->dwDuration = ch->nEntriesInUse -1; // NUMBER OF stream ticks == frames for video/samples for audio
    }

#ifdef DEBUG_ODML
    //printf ("ODML Write %s: Entries %ld size %d \n", dfcc, ch->nEntriesInUse, max);
#endif

    //OUTS(ch->fcc);
    //OUTD(max);
    OUTW(ch->wLongsPerEntry);
    OUTC(ch->bIndexSubType);
    OUTC(ch->bIndexType);
    OUTD(ch->nEntriesInUse);
    OUTS(ch->dwChunkId);
    OUTD(ch->qwBaseOffset&0xffffffff);
    OUTD((ch->qwBaseOffset>>32)&0xffffffff);
    OUTD(ch->dwReserved3);

    for (k = 0; k < ch->nEntriesInUse; k++) {
	OUTD(ch->aIndex[k].dwOffset);
	OUTD(ch->aIndex[k].dwSize);

    }
    avi_add_chunk (AVI, ch->fcc, ix00, max);

    free(ix00);

    return 0;
}
#undef OUTS
#undef OUTW
#undef OUTD
#undef OUTC

// inits a super index structure including its enclosed stdindex
static int avi_init_super_index(avi_t *AVI, unsigned char *idxtag, avisuperindex_chunk **si)
{
    int k;

    avisuperindex_chunk *sil = NULL;

    if ((sil = (avisuperindex_chunk *) malloc (sizeof (avisuperindex_chunk))) == NULL) {
	AVI_errno = AVI_ERR_NO_MEM;
	return -1;
    }
    memset(sil, 0, sizeof (avisuperindex_chunk));
    memcpy (sil->fcc, "indx", 4);
    sil->dwSize = 0; // size of this chunk
    sil->wLongsPerEntry = 4;
    sil->bIndexSubType = 0;
    sil->bIndexType = AVI_INDEX_OF_INDEXES;
    sil->nEntriesInUse = 0; // none are in use
    memcpy (sil->dwChunkId, idxtag, 4);
    memset (sil->dwReserved, 0, sizeof (sil->dwReserved));

    // NR_IXNN_CHUNKS == allow 32 indices which means 32 GB files -- arbitrary
    sil->aIndex = malloc (sil->wLongsPerEntry * NR_IXNN_CHUNKS * sizeof (uint32_t));
    if (!sil->aIndex) {
	AVI_errno = AVI_ERR_NO_MEM;
	return -1;
    }
    memset (sil->aIndex, 0, sil->wLongsPerEntry * NR_IXNN_CHUNKS * sizeof (uint32_t));

    sil->stdindex = malloc (NR_IXNN_CHUNKS * sizeof (avistdindex_chunk *));
    if (!sil->stdindex) {
	AVI_errno = AVI_ERR_NO_MEM;
	return -1;
    }
    for (k = 0; k < NR_IXNN_CHUNKS; k++) {
	sil->stdindex[k] = malloc (sizeof (avistdindex_chunk));
	memset(sil->stdindex[k], 0, sizeof (avistdindex_chunk));
	// gets rewritten later
	sil->stdindex[k]->qwBaseOffset = (uint64_t)k * NEW_RIFF_THRES;
    }

    *si = sil;

    return 0;
}

// fills an alloc'ed stdindex structure and mallocs some entries for the actual chunks
static int avi_add_std_index(avi_t *AVI, unsigned char *idxtag, unsigned char *strtag,
	avistdindex_chunk *stdil)
{

    memcpy (stdil->fcc, idxtag, 4); 
    stdil->dwSize = 4096;
    stdil->wLongsPerEntry = 2; //sizeof(avistdindex_entry)/sizeof(uint32_t);
    stdil->bIndexSubType = 0;
    stdil->bIndexType = AVI_INDEX_OF_CHUNKS;
    stdil->nEntriesInUse = 0;

    // cp 00db ChunkId
    memcpy(stdil->dwChunkId, strtag, 4);

    //stdil->qwBaseOffset = AVI->video_superindex->aIndex[ cur_std_idx ]->qwOffset;

    stdil->aIndex = malloc(stdil->dwSize * sizeof (uint32_t) * stdil->wLongsPerEntry);

    if (!stdil->aIndex) {
	AVI_errno = AVI_ERR_NO_MEM;
	return -1;
    }


    return 0;
}

static int avi_add_odml_index_entry_core(avi_t *AVI, long flags, off_t pos, unsigned long len, avistdindex_chunk *si) 
{
    int cur_chunk_idx;
    // put new chunk into index
    si->nEntriesInUse++;
    cur_chunk_idx = si->nEntriesInUse-1;

    // need to fetch more memory
    if (cur_chunk_idx >= si->dwSize) {
	si->dwSize += 4096;
	si->aIndex = realloc ( si->aIndex, si->dwSize * sizeof (uint32_t) * si->wLongsPerEntry);
    }

    if(len>AVI->max_len) AVI->max_len=len;

    // if bit 31 is set, it is NOT a keyframe
    if (flags != 0x10) {
	len |= 0x80000000;
    }

    si->aIndex [ cur_chunk_idx ].dwSize = len;
    si->aIndex [ cur_chunk_idx ].dwOffset = 
	pos - si->qwBaseOffset + 8;

    //printf("ODML: POS: 0x%lX\n", si->aIndex [ cur_chunk_idx ].dwOffset);

    return 0;
}

static int avi_add_odml_index_entry(avi_t *AVI, unsigned char *tag, long flags, off_t pos, unsigned long len) 
{
    char fcc[5];

    int audio = (strchr (tag, 'w')?1:0);
    int video = !audio;

    unsigned int cur_std_idx;
    int audtr;
    off_t towrite = 0LL;

    if (video) {

	if (!AVI->video_superindex) {
	    if (avi_init_super_index(AVI, "ix00", &AVI->video_superindex) < 0) return -1;
             AVI->video_superindex->nEntriesInUse++;
	    cur_std_idx = AVI->video_superindex->nEntriesInUse-1;

	    if (avi_add_std_index (AVI, "ix00", "00db", AVI->video_superindex->stdindex[ cur_std_idx ]) < 0) 
		return -1;
	} // init

    } // video

    if (audio) {

	fcc[0] = 'i'; fcc[1] = 'x'; fcc[2] = tag[0]; fcc[3] = tag[1]; fcc[4] = '\0';
	if (!AVI->track[AVI->aptr].audio_superindex) {

#ifdef DEBUG_ODML
	    printf("ODML: fcc = %s\n", fcc);
#endif
	    if (avi_init_super_index(AVI, fcc, &AVI->track[AVI->aptr].audio_superindex) < 0) return -1;


	    AVI->track[AVI->aptr].audio_superindex->nEntriesInUse++;

	    snprintf(fcc, sizeof(fcc), "ix%02d", AVI->aptr+1);
	    if (avi_add_std_index (AVI, fcc, tag, AVI->track[AVI->aptr].audio_superindex->stdindex[ 
			AVI->track[AVI->aptr].audio_superindex->nEntriesInUse - 1 ]) < 0
	       ) return -1;
	} // init

    }

    towrite = 0;
    if (AVI->video_superindex) {

	cur_std_idx = AVI->video_superindex->nEntriesInUse-1;
	towrite += AVI->video_superindex->stdindex[cur_std_idx]->nEntriesInUse*8 
	    + 4+4+2+1+1+4+4+8+4;
	if (cur_std_idx == 0) {
	    towrite += AVI->n_idx*16 + 8;
	    towrite += HEADERBYTES;
	}
    }

    for (audtr=0; audtr<AVI->anum; audtr++) {
	if (AVI->track[audtr].audio_superindex) {
	    cur_std_idx = AVI->track[audtr].audio_superindex->nEntriesInUse-1;
	    towrite += AVI->track[audtr].audio_superindex->stdindex[cur_std_idx]->nEntriesInUse*8 
		+ 4+4+2+1+1+4+4+8+4;
	}
    }
    towrite += len + (len&1) + 8;

    //printf("ODML: towrite = 0x%llX = %lld\n", towrite, towrite);

    if (AVI->video_superindex && 
	    (off_t)(AVI->pos+towrite) > (off_t)((off_t)NEW_RIFF_THRES*AVI->video_superindex->nEntriesInUse)) {

	fprintf(stderr, "Adding a new RIFF chunk: %d\n", AVI->video_superindex->nEntriesInUse);

	// rotate ALL indices
	AVI->video_superindex->nEntriesInUse++;
	cur_std_idx = AVI->video_superindex->nEntriesInUse-1;

	if (AVI->video_superindex->nEntriesInUse > NR_IXNN_CHUNKS) {
	    fprintf (stderr, "Internal error in avilib - redefine NR_IXNN_CHUNKS\n");
	    fprintf (stderr, "[avilib dump] cur_std_idx=%d NR_IXNN_CHUNKS=%d"
		    "POS=%lld towrite=%lld\n",
		    cur_std_idx,NR_IXNN_CHUNKS, AVI->pos, towrite);
	    return -1;
	}

	if (avi_add_std_index (AVI, "ix00", "00db", AVI->video_superindex->stdindex[ cur_std_idx ]) < 0) 
	    return -1;

	for (audtr = 0; audtr < AVI->anum; audtr++) {
	    char aud[5];
	    if (!AVI->track[audtr].audio_superindex) {
		// not initialized -> no index
		continue;
	    }
	    AVI->track[audtr].audio_superindex->nEntriesInUse++;

	    snprintf(fcc, sizeof(fcc), "ix%02d", audtr+1);
	    snprintf(aud, sizeof(aud), "0%01dwb", audtr+1);
	    if (avi_add_std_index (AVI, fcc, aud, AVI->track[audtr].audio_superindex->stdindex[ 
			AVI->track[audtr].audio_superindex->nEntriesInUse - 1 ]) < 0
	       ) return -1;
	}

	// write the new riff;
	if (cur_std_idx > 0) {

	    // dump the _previous_ == already finished index
	    avi_ixnn_entry (AVI, AVI->video_superindex->stdindex[cur_std_idx - 1], 
		    &AVI->video_superindex->aIndex[cur_std_idx - 1]);
	    AVI->video_superindex->aIndex[cur_std_idx - 1].dwDuration = 
		AVI->video_superindex->stdindex[cur_std_idx - 1]->nEntriesInUse - 1;

	    for (audtr = 0; audtr < AVI->anum; audtr++) {

		if (!AVI->track[audtr].audio_superindex) {
		    // not initialized -> no index
		    continue;
		}
		avi_ixnn_entry (AVI, AVI->track[audtr].audio_superindex->stdindex[cur_std_idx - 1], 
			&AVI->track[audtr].audio_superindex->aIndex[cur_std_idx - 1]);

		AVI->track[audtr].audio_superindex->aIndex[cur_std_idx - 1].dwDuration = 
		    AVI->track[audtr].audio_superindex->stdindex[cur_std_idx - 1]->nEntriesInUse - 1;
		if (AVI->track[audtr].a_fmt == 0x1) {
		    AVI->track[audtr].audio_superindex->aIndex[cur_std_idx - 1].dwDuration *= 
			AVI->track[audtr].a_bits*AVI->track[audtr].a_rate*AVI->track[audtr].a_chans/800;
		}
	    }

	    // XXX: dump idx1 structure
	    if (cur_std_idx == 1) {
		avi_add_chunk(AVI, (unsigned char *)"idx1", (unsigned char *)AVI->idx, AVI->n_idx*16);
		// qwBaseOffset will contain the start of the second riff chunk
	    }
	    // Fix the Offsets later at closing time
	    avi_add_chunk(AVI, (unsigned char *)"RIFF", "AVIXLIST\0\0\0\0movi", 16);

	    AVI->video_superindex->stdindex[ cur_std_idx ]->qwBaseOffset = AVI->pos -16 -8;
#ifdef DEBUG_ODML
	    printf("ODML: RIFF No.%02d at Offset 0x%llX\n", cur_std_idx, AVI->pos -16 -8);
#endif

	    for (audtr = 0; audtr < AVI->anum; audtr++) {
		if (AVI->track[audtr].audio_superindex)
		    AVI->track[audtr].audio_superindex->stdindex[ cur_std_idx ]->qwBaseOffset = 
			AVI->pos -16 -8;
		
	    }

	    // now we can be sure
	    AVI->is_opendml++;
	}

    }


    if (video) {
	avi_add_odml_index_entry_core(AVI, flags, AVI->pos, len, 
		AVI->video_superindex->stdindex[ AVI->video_superindex->nEntriesInUse-1 ]);

	AVI->total_frames++;
    } // video

    if (audio) {
	avi_add_odml_index_entry_core(AVI, flags, AVI->pos, len, 
		AVI->track[AVI->aptr].audio_superindex->stdindex[ 
		        AVI->track[AVI->aptr].audio_superindex->nEntriesInUse-1 ]);
    }


    return 0;
}

// #undef NR_IXNN_CHUNKS

static int avi_add_index_entry(avi_t *AVI, unsigned char *tag, long flags, unsigned long pos, unsigned long len)
{
   void *ptr;

   if(AVI->n_idx>=AVI->max_idx) {
     ptr = realloc((void *)AVI->idx,(AVI->max_idx+4096)*16);
     
     if(ptr == 0) {
       AVI_errno = AVI_ERR_NO_MEM;
       return -1;
     }
     AVI->max_idx += 4096;
     AVI->idx = (unsigned char((*)[16]) ) ptr;
   }
   
   /* Add index entry */

   //   fprintf(stderr, "INDEX %s %ld %lu %lu\n", tag, flags, pos, len);

   memcpy(AVI->idx[AVI->n_idx],tag,4);
   long2str(AVI->idx[AVI->n_idx]+ 4,flags);
   long2str(AVI->idx[AVI->n_idx]+ 8, pos);
   long2str(AVI->idx[AVI->n_idx]+12, len);
   
   /* Update counter */

   AVI->n_idx++;

   if(len>AVI->max_len) AVI->max_len=len;

   return 0;
}

/* Returns 1 if more audio is in that video junk */
int AVI_can_read_audio(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_WRITE) { return -1; }
   if(!AVI->video_index)         { return -1; }
   if(!AVI->track[AVI->aptr].audio_index)         { return -1; }      

   // is it -1? the last ones got left out --tibit 
   //if (AVI->track[AVI->aptr].audio_posc>=AVI->track[AVI->aptr].audio_chunks-1) {
   if (AVI->track[AVI->aptr].audio_posc>=AVI->track[AVI->aptr].audio_chunks) {
       return 0;
   }

   if (AVI->video_pos >= AVI->video_frames) return 1;
   
   if (AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].pos < AVI->video_index[AVI->video_pos].pos) return 1;
   else return 0;
}
/*
   AVI_open_output_file: Open an AVI File and write a bunch
                         of zero bytes as space for the header.

   returns a pointer to avi_t on success, a zero pointer on error
*/

avi_t* AVI_open_output_file(char * filename)
{
   avi_t *AVI;
   int i;

   unsigned char AVI_header[HEADERBYTES];

   /* Allocate the avi_t struct and zero it */

   AVI = (avi_t *) malloc(sizeof(avi_t));
   if(AVI==0)
   {
      AVI_errno = AVI_ERR_NO_MEM;
      return 0;
   }
   memset((void *)AVI,0,sizeof(avi_t));

   /* Since Linux needs a long time when deleting big files,
      we do not truncate the file when we open it.
      Instead it is truncated when the AVI file is closed */

#if defined(SYS_UNIX)
   AVI->fdes = xio_open(filename, O_RDWR|O_CREAT,
		    S_IRUSR|S_IWUSR|S_IRGRP|S_IWGRP|S_IROTH|S_IWOTH);
#elif defined(COMP_MINGW) || defined(COMP_CYGWIN)
   AVI->fdes = open(filename, O_RDWR|O_CREAT|O_BINARY, S_IRUSR | S_IWUSR);
#else
   AVI->fdes = open(filename, O_RDWR|O_CREAT|O_BINARY,
                    S_IRUSR | S_IWUSR | S_IGRP | S_IROTH);
#endif

   if (AVI->fdes < 0)
   {
      AVI_errno = AVI_ERR_OPEN;
      free(AVI);
      return 0;
   }

   /* Write out HEADERBYTES bytes, the header will go here
      when we are finished with writing */

   for (i=0;i<HEADERBYTES;i++) AVI_header[i] = 0;
   i = avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES);
   if (i != HEADERBYTES)
   {
      xio_close(AVI->fdes);
      AVI_errno = AVI_ERR_WRITE;
      free(AVI);
      return 0;
   }

   AVI->pos  = HEADERBYTES;
   AVI->mode = AVI_MODE_WRITE; /* open for writing */

   //init
   AVI->anum = 0;
   AVI->aptr = 0;

   return AVI;
}

void AVI_set_video(avi_t *AVI, int width, int height, double fps, char *compressor)
{
   /* may only be called if file is open for writing */

   if(AVI->mode==AVI_MODE_READ) return;

   AVI->width  = width;
   AVI->height = height;
   AVI->fps    = fps;
   
   if(strncmp(compressor, "RGB", 3)==0) {
     memset(AVI->compressor, 0, 4);
   } else {
     memcpy(AVI->compressor,compressor,4);
   }     
   
   AVI->compressor[4] = 0;

   avi_update_header(AVI);
}

void AVI_set_audio(avi_t *AVI, int channels, long rate, int bits, int format, long mp3rate)
{
   /* may only be called if file is open for writing */

   if(AVI->mode==AVI_MODE_READ) return;

   //inc audio tracks
   AVI->aptr=AVI->anum;
   ++AVI->anum;

   if(AVI->anum > AVI_MAX_TRACKS) {
     fprintf(stderr, "error - only %d audio tracks supported\n", AVI_MAX_TRACKS);
     exit(1);
   }

   AVI->track[AVI->aptr].a_chans = channels;
   AVI->track[AVI->aptr].a_rate  = rate;
   AVI->track[AVI->aptr].a_bits  = bits;
   AVI->track[AVI->aptr].a_fmt   = format;
   AVI->track[AVI->aptr].mp3rate = mp3rate;

   avi_update_header(AVI);
}

#define OUT4CC(s) \
   if(nhb<=HEADERBYTES-4) memcpy(AVI_header+nhb,s,4); nhb += 4

#define OUTLONG(n) \
   if(nhb<=HEADERBYTES-4) long2str(AVI_header+nhb,n); nhb += 4

#define OUTSHRT(n) \
   if(nhb<=HEADERBYTES-2) { \
      AVI_header[nhb  ] = (n   )&0xff; \
      AVI_header[nhb+1] = (n>>8)&0xff; \
   } \
   nhb += 2

#define OUTCHR(n) \
   if(nhb<=HEADERBYTES-1) { \
      AVI_header[nhb  ] = (n   )&0xff; \
   } \
   nhb += 1

#define OUTMEM(d, s) \
   { \
     unsigned int s_ = (s); \
     if(nhb <= HEADERBYTES-s_) \
        memcpy(AVI_header+nhb, (d), s_); \
     nhb += s_; \
   }


//ThOe write preliminary AVI file header: 0 frames, max vid/aud size
int avi_update_header(avi_t *AVI)
{
   int njunk, sampsize, hasIndex, ms_per_frame, frate, flag;
   int movi_len, hdrl_start, strl_start, j;
   unsigned char AVI_header[HEADERBYTES];
   long nhb;
   unsigned long xd_size, xd_size_align2;

   //assume max size
   movi_len = AVI_MAX_LEN - HEADERBYTES + 4;

   //assume index will be written
   hasIndex=1;

   if(AVI->fps < 0.001) {
     frate=0;
     ms_per_frame=0;
   } else {
     frate = (int) (FRAME_RATE_SCALE*AVI->fps + 0.5);
     ms_per_frame=(int) (1000000/AVI->fps + 0.5);
   }

   /* Prepare the file header */

   nhb = 0;

   /* The RIFF header */

   OUT4CC ("RIFF");
   OUTLONG(movi_len);    // assume max size
   OUT4CC ("AVI ");

   /* Start the header list */

   OUT4CC ("LIST");
   OUTLONG(0);        /* Length of list in bytes, don't know yet */
   hdrl_start = nhb;  /* Store start position */
   OUT4CC ("hdrl");

   /* The main AVI header */

   /* The Flags in AVI File header */

#define AVIF_HASINDEX           0x00000010      /* Index at end of file */
#define AVIF_MUSTUSEINDEX       0x00000020
#define AVIF_ISINTERLEAVED      0x00000100
#define AVIF_TRUSTCKTYPE        0x00000800      /* Use CKType to find key frames */
#define AVIF_WASCAPTUREFILE     0x00010000
#define AVIF_COPYRIGHTED        0x00020000

   OUT4CC ("avih");
   OUTLONG(56);                 /* # of bytes to follow */
   OUTLONG(ms_per_frame);       /* Microseconds per frame */
   //ThOe ->0 
   //   OUTLONG(10000000);           /* MaxBytesPerSec, I hope this will never be used */
   OUTLONG(0);
   OUTLONG(0);                  /* PaddingGranularity (whatever that might be) */
                                /* Other sources call it 'reserved' */
   flag = AVIF_ISINTERLEAVED;
   if(hasIndex) flag |= AVIF_HASINDEX;
   if(hasIndex && AVI->must_use_index) flag |= AVIF_MUSTUSEINDEX;
   OUTLONG(flag);               /* Flags */
   OUTLONG(0);                  // no frames yet
   OUTLONG(0);                  /* InitialFrames */

   OUTLONG(AVI->anum+1);

   OUTLONG(0);                  /* SuggestedBufferSize */
   OUTLONG(AVI->width);         /* Width */
   OUTLONG(AVI->height);        /* Height */
                                /* MS calls the following 'reserved': */
   OUTLONG(0);                  /* TimeScale:  Unit used to measure time */
   OUTLONG(0);                  /* DataRate:   Data rate of playback     */
   OUTLONG(0);                  /* StartTime:  Starting time of AVI data */
   OUTLONG(0);                  /* DataLength: Size of AVI data chunk    */


   /* Start the video stream list ---------------------------------- */

   OUT4CC ("LIST");
   OUTLONG(0);        /* Length of list in bytes, don't know yet */
   strl_start = nhb;  /* Store start position */
   OUT4CC ("strl");

   /* The video stream header */

   OUT4CC ("strh");
   OUTLONG(56);                 /* # of bytes to follow */
   OUT4CC ("vids");             /* Type */
   OUT4CC (AVI->compressor);    /* Handler */
   OUTLONG(0);                  /* Flags */
   OUTLONG(0);                  /* Reserved, MS says: wPriority, wLanguage */
   OUTLONG(0);                  /* InitialFrames */
   OUTLONG(FRAME_RATE_SCALE);              /* Scale */
   OUTLONG(frate);              /* Rate: Rate/Scale == samples/second */
   OUTLONG(0);                  /* Start */
   OUTLONG(0);                  // no frames yet
   OUTLONG(0);                  /* SuggestedBufferSize */
   OUTLONG(-1);                 /* Quality */
   OUTLONG(0);                  /* SampleSize */
   OUTLONG(0);                  /* Frame */
   OUTLONG(0);                  /* Frame */
   //   OUTLONG(0);                  /* Frame */
   //OUTLONG(0);                  /* Frame */

   /* The video stream format */

   xd_size        = AVI->extradata_size;
   xd_size_align2 = (AVI->extradata_size+1) & ~1;

   OUT4CC ("strf");
   OUTLONG(40 + xd_size_align2);/* # of bytes to follow */
   OUTLONG(40 + xd_size);	/* Size */
   OUTLONG(AVI->width);         /* Width */
   OUTLONG(AVI->height);        /* Height */
   OUTSHRT(1); OUTSHRT(24);     /* Planes, Count */
   OUT4CC (AVI->compressor);    /* Compression */
   // ThOe (*3)
   OUTLONG(AVI->width*AVI->height*3);  /* SizeImage (in bytes?) */
   OUTLONG(0);                  /* XPelsPerMeter */
   OUTLONG(0);                  /* YPelsPerMeter */
   OUTLONG(0);                  /* ClrUsed: Number of colors used */
   OUTLONG(0);                  /* ClrImportant: Number of colors important */

   // write extradata
   if (xd_size > 0 && AVI->extradata) {
      OUTMEM(AVI->extradata, xd_size);
      if (xd_size != xd_size_align2) {
         OUTCHR(0);
      }
   }

   /* Finish stream list, i.e. put number of bytes in the list to proper pos */

   long2str(AVI_header+strl_start-4,nhb-strl_start);

   
   /* Start the audio stream list ---------------------------------- */
   
   for(j=0; j<AVI->anum; ++j) {
       
       sampsize = avi_sampsize(AVI, j);
   
       OUT4CC ("LIST");
       OUTLONG(0);        /* Length of list in bytes, don't know yet */
       strl_start = nhb;  /* Store start position */
       OUT4CC ("strl");
       
       /* The audio stream header */
       
       OUT4CC ("strh");
       OUTLONG(56);            /* # of bytes to follow */
       OUT4CC ("auds");
       
       // -----------
       // ThOe
       OUTLONG(0);             /* Format (Optionally) */
       // -----------
       
       OUTLONG(0);             /* Flags */
       OUTLONG(0);             /* Reserved, MS says: wPriority, wLanguage */
       OUTLONG(0);             /* InitialFrames */
       
       // ThOe /4
       OUTLONG(sampsize/4);      /* Scale */
       OUTLONG(1000*AVI->track[j].mp3rate/8);
       OUTLONG(0);             /* Start */
       OUTLONG(4*AVI->track[j].audio_bytes/sampsize);   /* Length */
       OUTLONG(0);             /* SuggestedBufferSize */
       OUTLONG(-1);            /* Quality */
       
       // ThOe /4
       OUTLONG(sampsize/4);    /* SampleSize */
       
       OUTLONG(0);             /* Frame */
       OUTLONG(0);             /* Frame */
       //       OUTLONG(0);             /* Frame */
       //OUTLONG(0);             /* Frame */
       
       /* The audio stream format */
       
       OUT4CC ("strf");
       OUTLONG(16);                   /* # of bytes to follow */
       OUTSHRT(AVI->track[j].a_fmt);           /* Format */
       OUTSHRT(AVI->track[j].a_chans);         /* Number of channels */
       OUTLONG(AVI->track[j].a_rate);          /* SamplesPerSec */
       // ThOe
       OUTLONG(1000*AVI->track[j].mp3rate/8);
       //ThOe (/4)
       
       OUTSHRT(sampsize/4);           /* BlockAlign */
       
       
       OUTSHRT(AVI->track[j].a_bits);          /* BitsPerSample */
       
       /* Finish stream list, i.e. put number of bytes in the list to proper pos */
       
       long2str(AVI_header+strl_start-4,nhb-strl_start);
   }
   
   /* Finish header list */
   
   long2str(AVI_header+hdrl_start-4,nhb-hdrl_start);
   
   
   /* Calculate the needed amount of junk bytes, output junk */
   
   njunk = HEADERBYTES - nhb - 8 - 12;
   
   /* Safety first: if njunk <= 0, somebody has played with
      HEADERBYTES without knowing what (s)he did.
      This is a fatal error */
   
   if(njunk<=0)
     {
       fprintf(stderr,"AVI_close_output_file: # of header bytes too small\n");
       exit(1);
     }
   
   OUT4CC ("JUNK");
   OUTLONG(njunk);
   memset(AVI_header+nhb,0,njunk);
   
   nhb += njunk;

   /* Start the movi list */

   OUT4CC ("LIST");
   OUTLONG(movi_len); /* Length of list in bytes */
   OUT4CC ("movi");

   /* Output the header, truncate the file to the number of bytes
      actually written, report an error if someting goes wrong */

   if ( xio_lseek(AVI->fdes,0,SEEK_SET)<0 ||
        avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES)!=HEADERBYTES ||
	xio_lseek(AVI->fdes,AVI->pos,SEEK_SET)<0)
     {
       AVI_errno = AVI_ERR_CLOSE;
       return -1;
     }

   return 0;
}

static int valid_info_tag(char *c)
{
    if      (!strncmp(c, "IARL", 4)) return 1; 
    else if (!strncmp(c, "IART", 4)) return 1; 
    else if (!strncmp(c, "ICMS", 4)) return 1; 
    else if (!strncmp(c, "ICMT", 4)) return 1; 
    else if (!strncmp(c, "ICOP", 4)) return 1; 
    else if (!strncmp(c, "ICRD", 4)) return 1; 
    else if (!strncmp(c, "ICRP", 4)) return 1; 
    else if (!strncmp(c, "IDIM", 4)) return 1; 
    else if (!strncmp(c, "IDPI", 4)) return 1; 
    else if (!strncmp(c, "IENG", 4)) return 1; 
    else if (!strncmp(c, "IGNR", 4)) return 1; 
    else if (!strncmp(c, "IKEY", 4)) return 1; 
    else if (!strncmp(c, "ILGT", 4)) return 1; 
    else if (!strncmp(c, "IMED", 4)) return 1; 
    else if (!strncmp(c, "INAM", 4)) return 1; 
    else if (!strncmp(c, "IPLT", 4)) return 1; 
    else if (!strncmp(c, "IPRD", 4)) return 1; 
    else if (!strncmp(c, "ISBJ", 4)) return 1; 
    else if (!strncmp(c, "ISHP", 4)) return 1; 
    else if (!strncmp(c, "ISRC", 4)) return 1; 
    else if (!strncmp(c, "ISRF", 4)) return 1; 
    else if (!strncmp(c, "ITCH", 4)) return 1;
    else return 0;

    return 0;
}
// see ../docs/avi_comments.txt
// returns the length of written stream (-1 on error)
static int avi_parse_comments (int fd, char *buf, int space_left) 
{
    int len=0, readlen=0, k;
    char *data, *c, *d;
    struct stat st;
    
    // safety checks
    if (fd<=0 || !buf || space_left<=0)
	return -1;

    memset (buf, 0, space_left);
    if (fstat (fd, &st) == -1) {
	perror ("stat");
	return -1;
    }

    if ( !(data = malloc(st.st_size*sizeof(char)+1)) ) {
	fprintf(stderr, "malloc failed\n"); 
	return -1;
    }

    readlen = avi_read ( fd, data, st.st_size);

    //printf("Read %d bytes from %d\n", readlen, fd);

    c = data;
    space_left--;
    
    while (len < space_left) {
	if ( !c || *c == '\0')
	    break; // eof;
	else if (*c == '#') { // comment, ignore
	    c = strchr(c, '\n')+1;
	}
	else if (*c == '\n') { // empty, ignore
	    c++;
	}
	else if (*c == 'I') {

	    // do not write ISFT -- this is written by transcode
	    // and important for debugging.
	    if (!valid_info_tag(c)) {
		// skip this line
		while (c && *c && *c != '\n' ) {
		    c++;
		}
		continue;
	    }

	    // set d after TAG
	    d = c+4;

	    // find first non-blank (!space or !TAB)
	    while ( d && *d && (*d == ' ' || *d == '	')) ++d;
	    if (!d) break;

	    // TAG without argument is fine but ignored
	    if (*d == '\n' || *d == '\r') { 
		c = d+1; 
		if (*c == '\n') ++c; 
		continue; 
	    }
 
	    k = 0;
	    while (d[k] != '\r' && d[k] != '\n' && d[k] != '\0') ++k;
	    if (k>=space_left) return len;

	    // write TAG
	    memcpy(buf+len,c,4); 
	    len += 4;

	    // write length + '\0'
	    long2str(buf+len, k+1); len += 4;

	    // write comment string
	    memcpy (buf+len, d, k);
	    // must be null terminated
	    *(buf+len+k+1) = '\0';

	    // PAD
	    if ((k+1)&1) {
		k++;
		*(buf+len+k+1) = '\0';
	    }
	    len += k+1;
  
	    // advance c
	    while (*c != '\n' && *c != '\0') ++c;
	    if (*c != '\0') ++c;
	    else break;

	} else {

	    // ignore junk lines
	    while (c && *c && *c != '\n' ) {
		if (*c == ' ' || *c == '	') { c++; break; }
		c++;
	    }
	    if (!c) break;
	}

    }
    free(data);

    return len;
}

//SLM
#ifndef S_IRUSR
#define S_IRWXU       00700       /* read, write, execute: owner */
#define S_IRUSR       00400       /* read permission: owner */
#define S_IWUSR       00200       /* write permission: owner */
#define S_IXUSR       00100       /* execute permission: owner */
#define S_IRWXG       00070       /* read, write, execute: group */
#define S_IRGRP       00040       /* read permission: group */
#define S_IWGRP       00020       /* write permission: group */
#define S_IXGRP       00010       /* execute permission: group */
#define S_IRWXO       00007       /* read, write, execute: other */
#define S_IROTH       00004       /* read permission: other */
#define S_IWOTH       00002       /* write permission: other */
#define S_IXOTH       00001       /* execute permission: other */
#endif

/*
  Write the header of an AVI file and close it.
  returns 0 on success, -1 on write error.
*/

static int avi_close_output_file(avi_t *AVI)
{

   int ret, njunk, sampsize, hasIndex, ms_per_frame, frate, idxerror, flag;
   unsigned long movi_len;
   int hdrl_start, strl_start, j;
   unsigned char AVI_header[HEADERBYTES];
   long nhb;
   unsigned long xd_size, xd_size_align2;

#ifdef INFO_LIST
   long info_len;
   long id_len, real_id_len;
   long info_start_pos;
//   time_t calptr;
#endif

   /* Calculate length of movi list */

   // dump the rest of the index
   if (AVI->is_opendml) {
       int cur_std_idx = AVI->video_superindex->nEntriesInUse-1;
       int audtr;

#ifdef DEBUG_ODML
       printf("ODML dump the rest indices\n");
#endif
       avi_ixnn_entry (AVI, AVI->video_superindex->stdindex[cur_std_idx], 
	       &AVI->video_superindex->aIndex[cur_std_idx]);

       AVI->video_superindex->aIndex[cur_std_idx].dwDuration = 
	   AVI->video_superindex->stdindex[cur_std_idx]->nEntriesInUse - 1;

       for (audtr = 0; audtr < AVI->anum; audtr++) {
	    if (!AVI->track[audtr].audio_superindex) {
		// not initialized -> no index
		continue;
	    }
	   avi_ixnn_entry (AVI, AVI->track[audtr].audio_superindex->stdindex[cur_std_idx], 
		   &AVI->track[audtr].audio_superindex->aIndex[cur_std_idx]);
	   AVI->track[audtr].audio_superindex->aIndex[cur_std_idx].dwDuration = 
	       AVI->track[audtr].audio_superindex->stdindex[cur_std_idx]->nEntriesInUse - 1;
	   if (AVI->track[audtr].a_fmt == 0x1) {
	       AVI->track[audtr].audio_superindex->aIndex[cur_std_idx].dwDuration *= 
		   AVI->track[audtr].a_bits*AVI->track[audtr].a_rate*AVI->track[audtr].a_chans/800;
	   }
       }
       // The AVI->video_superindex->nEntriesInUse contains the offset 
       AVI->video_superindex->stdindex[ cur_std_idx+1 ]->qwBaseOffset = AVI->pos;
   }

   if (AVI->is_opendml) {
       // Correct!
       movi_len = AVI->video_superindex->stdindex[ 1 ]->qwBaseOffset - HEADERBYTES+4 - AVI->n_idx*16 - 8;
   } else {
       movi_len = AVI->pos - HEADERBYTES + 4;
   }


   /* Try to ouput the index entries. This may fail e.g. if no space
      is left on device. We will report this as an error, but we still
      try to write the header correctly (so that the file still may be
      readable in the most cases */

   idxerror = 0;
   hasIndex = 1;
   if (!AVI->is_opendml) {
       //   fprintf(stderr, "pos=%lu, index_len=%ld             \n", AVI->pos, AVI->n_idx*16);
       ret = avi_add_chunk(AVI, (unsigned char *)"idx1", (unsigned char *)AVI->idx, AVI->n_idx*16);
       hasIndex = (ret==0);
       //fprintf(stderr, "pos=%lu, index_len=%d\n", AVI->pos, hasIndex);

       if(ret) {
	   idxerror = 1;
	   AVI_errno = AVI_ERR_WRITE_INDEX;
       }
   }
   
   /* Calculate Microseconds per frame */

   if(AVI->fps < 0.001) {
     frate=0;
     ms_per_frame=0;
   } else {
     frate = (int) (FRAME_RATE_SCALE*AVI->fps + 0.5);
     ms_per_frame=(int) (1000000/AVI->fps + 0.5);
   }

   /* Prepare the file header */

   nhb = 0;

   /* The RIFF header */

   OUT4CC ("RIFF");
   if (AVI->is_opendml) {
       OUTLONG(AVI->video_superindex->stdindex[ 1 ]->qwBaseOffset - 8);    /* # of bytes to follow */
   } else {
       OUTLONG(AVI->pos - 8);    /* # of bytes to follow */
   }

   OUT4CC ("AVI ");

   /* Start the header list */

   OUT4CC ("LIST");
   OUTLONG(0);        /* Length of list in bytes, don't know yet */
   hdrl_start = nhb;  /* Store start position */
   OUT4CC ("hdrl");

   /* The main AVI header */

   /* The Flags in AVI File header */

#define AVIF_HASINDEX           0x00000010      /* Index at end of file */
#define AVIF_MUSTUSEINDEX       0x00000020
#define AVIF_ISINTERLEAVED      0x00000100
#define AVIF_TRUSTCKTYPE        0x00000800      /* Use CKType to find key frames */
#define AVIF_WASCAPTUREFILE     0x00010000
#define AVIF_COPYRIGHTED        0x00020000

   OUT4CC ("avih");
   OUTLONG(56);                 /* # of bytes to follow */
   OUTLONG(ms_per_frame);       /* Microseconds per frame */
   //ThOe ->0 
   //   OUTLONG(10000000);           /* MaxBytesPerSec, I hope this will never be used */
   OUTLONG(0);
   OUTLONG(0);                  /* PaddingGranularity (whatever that might be) */
                                /* Other sources call it 'reserved' */
   flag = AVIF_ISINTERLEAVED;
   if(hasIndex) flag |= AVIF_HASINDEX;
   if(hasIndex && AVI->must_use_index) flag |= AVIF_MUSTUSEINDEX;
   OUTLONG(flag);               /* Flags */
   OUTLONG(AVI->video_frames);  /* TotalFrames */
   OUTLONG(0);                  /* InitialFrames */

   OUTLONG(AVI->anum+1);
//   if (AVI->track[0].audio_bytes)
//      { OUTLONG(2); }           /* Streams */
//   else
//      { OUTLONG(1); }           /* Streams */

   OUTLONG(0);                  /* SuggestedBufferSize */
   OUTLONG(AVI->width);         /* Width */
   OUTLONG(AVI->height);        /* Height */
                                /* MS calls the following 'reserved': */
   OUTLONG(0);                  /* TimeScale:  Unit used to measure time */
   OUTLONG(0);                  /* DataRate:   Data rate of playback     */
   OUTLONG(0);                  /* StartTime:  Starting time of AVI data */
   OUTLONG(0);                  /* DataLength: Size of AVI data chunk    */


   /* Start the video stream list ---------------------------------- */

   OUT4CC ("LIST");
   OUTLONG(0);        /* Length of list in bytes, don't know yet */
   strl_start = nhb;  /* Store start position */
   OUT4CC ("strl");

   /* The video stream header */

   OUT4CC ("strh");
   OUTLONG(56);                 /* # of bytes to follow */
   OUT4CC ("vids");             /* Type */
   OUT4CC (AVI->compressor);    /* Handler */
   OUTLONG(0);                  /* Flags */
   OUTLONG(0);                  /* Reserved, MS says: wPriority, wLanguage */
   OUTLONG(0);                  /* InitialFrames */
   OUTLONG(FRAME_RATE_SCALE);   /* Scale */
   OUTLONG(frate);              /* Rate: Rate/Scale == samples/second */
   OUTLONG(0);                  /* Start */
   OUTLONG(AVI->video_frames);  /* Length */
   OUTLONG(AVI->max_len);       /* SuggestedBufferSize */
   OUTLONG(0);                  /* Quality */
   OUTLONG(0);                  /* SampleSize */
   OUTLONG(0);                  /* Frame */
   OUTLONG(0);                  /* Frame */
   //OUTLONG(0);                  /* Frame */
   //OUTLONG(0);                  /* Frame */

   /* The video stream format */

   xd_size        = AVI->extradata_size;
   xd_size_align2 = (AVI->extradata_size+1) & ~1;

   OUT4CC ("strf");
   OUTLONG(40 + xd_size_align2);/* # of bytes to follow */
   OUTLONG(40 + xd_size);	/* Size */
   OUTLONG(AVI->width);         /* Width */
   OUTLONG(AVI->height);        /* Height */
   OUTSHRT(1); OUTSHRT(24);     /* Planes, Count */
   OUT4CC (AVI->compressor);    /* Compression */
   // ThOe (*3)
   OUTLONG(AVI->width*AVI->height*3);  /* SizeImage (in bytes?) */
   OUTLONG(0);                  /* XPelsPerMeter */
   OUTLONG(0);                  /* YPelsPerMeter */
   OUTLONG(0);                  /* ClrUsed: Number of colors used */
   OUTLONG(0);                  /* ClrImportant: Number of colors important */

   // write extradata if present
   if (xd_size > 0 && AVI->extradata) {
      OUTMEM(AVI->extradata, xd_size);
      if (xd_size != xd_size_align2) {
         OUTCHR(0);
      }
   }

   // dump index of indices for audio
   if (AVI->is_opendml) {

       int k;

       OUT4CC(AVI->video_superindex->fcc);
       OUTLONG(2+1+1+4+4+3*4 + AVI->video_superindex->nEntriesInUse * (8+4+4));
       OUTSHRT(AVI->video_superindex->wLongsPerEntry);
       OUTCHR(AVI->video_superindex->bIndexSubType);
       OUTCHR(AVI->video_superindex->bIndexType);
       OUTLONG(AVI->video_superindex->nEntriesInUse);
       OUT4CC(AVI->video_superindex->dwChunkId);
       OUTLONG(0);
       OUTLONG(0);
       OUTLONG(0);


       for (k = 0; k < AVI->video_superindex->nEntriesInUse; k++) {
	   uint32_t r = (AVI->video_superindex->aIndex[k].qwOffset >> 32) & 0xffffffff;
	   uint32_t s = (AVI->video_superindex->aIndex[k].qwOffset) & 0xffffffff;

	printf("VID NrEntries %d/%ld (%c%c%c%c) |0x%llX|%ld|%ld|\n",  k, 
		(unsigned long)AVI->video_superindex->nEntriesInUse,
		AVI->video_superindex->dwChunkId[0],
		AVI->video_superindex->dwChunkId[1],
		AVI->video_superindex->dwChunkId[2],
		AVI->video_superindex->dwChunkId[3],
		(unsigned long long)AVI->video_superindex->aIndex[k].qwOffset,
		(unsigned long)AVI->video_superindex->aIndex[k].dwSize,
		(unsigned long)AVI->video_superindex->aIndex[k].dwDuration
		);
	   /*
		*/

	   OUTLONG(s);
	   OUTLONG(r);
	   OUTLONG(AVI->video_superindex->aIndex[k].dwSize);
	   OUTLONG(AVI->video_superindex->aIndex[k].dwDuration);
       }

   }

   /* Finish stream list, i.e. put number of bytes in the list to proper pos */

   long2str(AVI_header+strl_start-4,nhb-strl_start);

   /* Start the audio stream list ---------------------------------- */

   for(j=0; j<AVI->anum; ++j) {
     
     //if (AVI->track[j].a_chans && AVI->track[j].audio_bytes)
       {
	 unsigned long nBlockAlign = 0;
	 unsigned long avgbsec = 0;
	 unsigned long scalerate = 0;
	   
	 sampsize = avi_sampsize(AVI, j);
	 sampsize = AVI->track[j].a_fmt==0x1?sampsize*4:sampsize;

	 nBlockAlign = (AVI->track[j].a_rate<32000)?576:1152;
	 /*
	 printf("XXX sampsize (%d) block (%ld) rate (%ld) audio_bytes (%ld) mp3rate(%ld,%ld)\n", 
		 sampsize, nBlockAlign, AVI->track[j].a_rate, 
		 (long int)AVI->track[j].audio_bytes, 
		 1000*AVI->track[j].mp3rate/8, AVI->track[j].mp3rate);
		 */
	   
	 if (AVI->track[j].a_fmt==0x1) {
	     sampsize = (AVI->track[j].a_chans<2)?sampsize/2:sampsize;
	     avgbsec = AVI->track[j].a_rate*sampsize/4;
	     scalerate = AVI->track[j].a_rate*sampsize/4;
	 } else  {
	     avgbsec = 1000*AVI->track[j].mp3rate/8;
	     scalerate = 1000*AVI->track[j].mp3rate/8;
	 }

	 OUT4CC ("LIST");
	 OUTLONG(0);        /* Length of list in bytes, don't know yet */
	 strl_start = nhb;  /* Store start position */
	 OUT4CC ("strl");
	   
	 /* The audio stream header */
	 
	 OUT4CC ("strh");
	 OUTLONG(56);            /* # of bytes to follow */
	 OUT4CC ("auds");
	 
	 // -----------
	 // ThOe
	 OUTLONG(0);             /* Format (Optionally) */
	   // -----------
	   
	 OUTLONG(0);             /* Flags */
	 OUTLONG(0);             /* Reserved, MS says: wPriority, wLanguage */
	 OUTLONG(0);             /* InitialFrames */
	 
	 // VBR 
	 if (AVI->track[j].a_fmt == 0x55 && AVI->track[j].a_vbr) {
	     OUTLONG(nBlockAlign);                   /* Scale */
	     OUTLONG(AVI->track[j].a_rate);          /* Rate */
	     OUTLONG(0);                             /* Start */
	     OUTLONG(AVI->track[j].audio_chunks);    /* Length */
	     OUTLONG(0);                      /* SuggestedBufferSize */
	     OUTLONG(0);                             /* Quality */
	     OUTLONG(0);                             /* SampleSize */
	     OUTLONG(0);                             /* Frame */
	     OUTLONG(0);                             /* Frame */
	 } else {
	     OUTLONG(sampsize/4);                    /* Scale */
	     OUTLONG(scalerate);  /* Rate */
	     OUTLONG(0);                             /* Start */
	     OUTLONG(4*AVI->track[j].audio_bytes/sampsize);   /* Length */
	     OUTLONG(0);                             /* SuggestedBufferSize */
	     OUTLONG(0xffffffff);                             /* Quality */
	     OUTLONG(sampsize/4);                    /* SampleSize */
	     OUTLONG(0);                             /* Frame */
	     OUTLONG(0);                             /* Frame */
	 }
	   
	 /* The audio stream format */

	 OUT4CC ("strf");
	 
	 if (AVI->track[j].a_fmt == 0x55 && AVI->track[j].a_vbr) {

	     OUTLONG(30);                            /* # of bytes to follow */ // mplayer writes 28
	     OUTSHRT(AVI->track[j].a_fmt);           /* Format */                  // 2
	     OUTSHRT(AVI->track[j].a_chans);         /* Number of channels */      // 2
	     OUTLONG(AVI->track[j].a_rate);          /* SamplesPerSec */           // 4
	     //ThOe/tibit
	     OUTLONG(1000*AVI->track[j].mp3rate/8);  /* maybe we should write an avg. */ // 4
	     OUTSHRT(nBlockAlign);                   /* BlockAlign */              // 2
	     OUTSHRT(AVI->track[j].a_bits);          /* BitsPerSample */           // 2

	     OUTSHRT(12);                           /* cbSize */                   // 2
	     OUTSHRT(1);                            /* wID */                      // 2
	     OUTLONG(2);                            /* fdwFlags */                 // 4
	     OUTSHRT(nBlockAlign);                  /* nBlockSize */               // 2
	     OUTSHRT(1);                            /* nFramesPerBlock */          // 2
	     OUTSHRT(0);                            /* nCodecDelay */              // 2
	 
	 } else if (AVI->track[j].a_fmt == 0x55 && !AVI->track[j].a_vbr) {

	     OUTLONG(30);                            /* # of bytes to follow */
	     OUTSHRT(AVI->track[j].a_fmt);           /* Format */
	     OUTSHRT(AVI->track[j].a_chans);         /* Number of channels */
	     OUTLONG(AVI->track[j].a_rate);          /* SamplesPerSec */
	     //ThOe/tibit
	     OUTLONG(1000*AVI->track[j].mp3rate/8);
	     OUTSHRT(sampsize/4);                    /* BlockAlign */
	     OUTSHRT(AVI->track[j].a_bits);          /* BitsPerSample */

	     OUTSHRT(12);                           /* cbSize */
	     OUTSHRT(1);                            /* wID */
	     OUTLONG(2);                            /* fdwFlags */
	     OUTSHRT(nBlockAlign);                  /* nBlockSize */
	     OUTSHRT(1);                            /* nFramesPerBlock */
	     OUTSHRT(0);                            /* nCodecDelay */
	 
	 } else {

	     OUTLONG(18);                   /* # of bytes to follow */
	     OUTSHRT(AVI->track[j].a_fmt);           /* Format */
	     OUTSHRT(AVI->track[j].a_chans);         /* Number of channels */
	     OUTLONG(AVI->track[j].a_rate);          /* SamplesPerSec */
	     //ThOe/tibit
	     OUTLONG(avgbsec);  /* Avg bytes/sec */
	     OUTSHRT(sampsize/4);                    /* BlockAlign */
	     OUTSHRT(AVI->track[j].a_bits);          /* BitsPerSample */
	     OUTSHRT(0);                           /* cbSize */  

	 }
       }
       if (AVI->is_opendml) {

	   int k ;

	    if (!AVI->track[j].audio_superindex) {
		// not initialized -> no index
		continue;
	    }

	   OUT4CC(AVI->track[j].audio_superindex->fcc);    /* "indx" */
	   OUTLONG(2+1+1+4+4+3*4 + AVI->track[j].audio_superindex->nEntriesInUse * (8+4+4));
	   OUTSHRT(AVI->track[j].audio_superindex->wLongsPerEntry);
	   OUTCHR(AVI->track[j].audio_superindex->bIndexSubType);
	   OUTCHR(AVI->track[j].audio_superindex->bIndexType);
	   OUTLONG(AVI->track[j].audio_superindex->nEntriesInUse);
	   OUT4CC(AVI->track[j].audio_superindex->dwChunkId);
	   OUTLONG(0); OUTLONG(0); OUTLONG(0);

	   for (k = 0; k < AVI->track[j].audio_superindex->nEntriesInUse; k++) {
	       uint32_t r = (AVI->track[j].audio_superindex->aIndex[k].qwOffset >> 32) & 0xffffffff;
	       uint32_t s = (AVI->track[j].audio_superindex->aIndex[k].qwOffset) & 0xffffffff;

	       /*
	       printf("AUD[%d] NrEntries %d/%ld (%c%c%c%c) |0x%llX|%ld|%ld| \n",  j, k, 
	               AVI->track[j].audio_superindex->nEntriesInUse,
		       AVI->track[j].audio_superindex->dwChunkId[0], AVI->track[j].audio_superindex->dwChunkId[1],
		       AVI->track[j].audio_superindex->dwChunkId[2], AVI->track[j].audio_superindex->dwChunkId[3],
		       AVI->track[j].audio_superindex->aIndex[k].qwOffset,
		       AVI->track[j].audio_superindex->aIndex[k].dwSize,
		       AVI->track[j].audio_superindex->aIndex[k].dwDuration
		     );
		     */

	       OUTLONG(s);
	       OUTLONG(r);
	       OUTLONG(AVI->track[j].audio_superindex->aIndex[k].dwSize);
	       OUTLONG(AVI->track[j].audio_superindex->aIndex[k].dwDuration);
	   }
       }
       /* Finish stream list, i.e. put number of bytes in the list to proper pos */
       long2str(AVI_header+strl_start-4,nhb-strl_start);
   }

   if (AVI->is_opendml) {
       OUT4CC("LIST");
       OUTLONG(16);
       OUT4CC("odml");
       OUT4CC("dmlh");
       OUTLONG(4);
       OUTLONG(AVI->total_frames);
   }
   
   /* Finish header list */
   
   long2str(AVI_header+hdrl_start-4,nhb-hdrl_start);


   // add INFO list --- (0.6.0pre4)

#ifdef INFO_LIST
   OUT4CC ("LIST");
   
   info_start_pos = nhb;
   info_len = MAX_INFO_STRLEN + 12;
   OUTLONG(info_len); // rewritten later
   OUT4CC ("INFO");

   OUT4CC ("ISFT");
   //OUTLONG(MAX_INFO_STRLEN);
   memset(id_str, 0, MAX_INFO_STRLEN);

   snprintf(id_str, sizeof(id_str), "%s-%s", PACKAGE, VERSION);
   real_id_len = id_len = strlen(id_str)+1;
   if (id_len&1) id_len++;

   OUTLONG(real_id_len);

   memset(AVI_header+nhb, 0, id_len);
   memcpy(AVI_header+nhb, id_str, id_len);
   nhb += id_len;

   info_len = avi_parse_comments (AVI->comment_fd, AVI_header+nhb, HEADERBYTES - nhb - 8 - 12);
   if (info_len <= 0) info_len=0;

   // write correct len
   long2str(AVI_header+info_start_pos, info_len + id_len + 4+4+4);

   nhb += info_len;

//   OUT4CC ("ICMT");
//   OUTLONG(MAX_INFO_STRLEN);

//   calptr=time(NULL); 
//   snprintf(id_str, sizeof(id_str), "\t%s %s", ctime(&calptr), "");
//   memset(AVI_header+nhb, 0, MAX_INFO_STRLEN);
//   memcpy(AVI_header+nhb, id_str, 25);
//   nhb += MAX_INFO_STRLEN;
#endif

   // ----------------------------
   
   /* Calculate the needed amount of junk bytes, output junk */
   
   njunk = HEADERBYTES - nhb - 8 - 12;
   
   /* Safety first: if njunk <= 0, somebody has played with
      HEADERBYTES without knowing what (s)he did.
      This is a fatal error */
   
   if(njunk<=0)
   {
      fprintf(stderr,"AVI_close_output_file: # of header bytes too small\n");
      exit(1);
   }

   OUT4CC ("JUNK");
   OUTLONG(njunk);
   memset(AVI_header+nhb,0,njunk);
   
   nhb += njunk;

   /* Start the movi list */

   OUT4CC ("LIST");
   OUTLONG(movi_len); /* Length of list in bytes */
   OUT4CC ("movi");

   /* Output the header, truncate the file to the number of bytes
      actually written, report an error if someting goes wrong */

   if ( xio_lseek(AVI->fdes,0,SEEK_SET)<0 ||
        avi_write(AVI->fdes,(char *)AVI_header,HEADERBYTES)!=HEADERBYTES ||
        xio_ftruncate(AVI->fdes,AVI->pos)<0 )
   {
      AVI_errno = AVI_ERR_CLOSE;
      return -1;
   }


   // Fix up the empty additional RIFF and LIST chunks
   if (AVI->is_opendml) {
       int k = 0;
       char f[4];
       unsigned int len;
       
       for (k=1; k<AVI->video_superindex->nEntriesInUse; k++) {
	    // the len of the RIFF Chunk
	    xio_lseek(AVI->fdes, AVI->video_superindex->stdindex[k]->qwBaseOffset+4, SEEK_SET);
	    len = AVI->video_superindex->stdindex[k+1]->qwBaseOffset -
		  AVI->video_superindex->stdindex[k]->qwBaseOffset - 8;
	    long2str(f, len);
	    avi_write(AVI->fdes, f, 4);

	    // len of the LIST/movi chunk
	    xio_lseek(AVI->fdes, 8, SEEK_CUR);
	    len -= 12;
	    long2str(f, len);
	    avi_write(AVI->fdes, f, 4);
       }
   }


   if(idxerror) return -1;

   return 0;
}

/*
   AVI_write_data:
   Add video or audio data to the file;

   Return values:
    0    No error;
   -1    Error, AVI_errno is set appropriatly;

*/

static int avi_write_data(avi_t *AVI, char *data, unsigned long length, int audio, int keyframe)
{
   int n = 0;

   unsigned char astr[5];
   
   // transcode core itself checks for the size -- unneeded and 
   // does harm to xvid 2pass encodes where the first pass can get 
   // _very_ large -- tibit.
   
#if 0 
   /* Check for maximum file length */
   
   if ( (AVI->pos + 8 + length + 8 + (AVI->n_idx+1)*16) > AVI_MAX_LEN ) {
     AVI_errno = AVI_ERR_SIZELIM;
     return -1;
   }
#endif
   
   /* Add index entry */

   //set tag for current audio track
   snprintf((char *)astr, sizeof(astr), "0%1dwb", (int)(AVI->aptr+1));

   if(audio) {
     if (!AVI->is_opendml) n = avi_add_index_entry(AVI,astr,0x10,AVI->pos,length);
     n += avi_add_odml_index_entry(AVI,astr,0x10,AVI->pos,length);
   } else {
     if (!AVI->is_opendml) n = avi_add_index_entry(AVI,(unsigned char *)"00db",((keyframe)?0x10:0x0),AVI->pos,length);
     n += avi_add_odml_index_entry(AVI,(unsigned char *)"00db",((keyframe)?0x10:0x0),AVI->pos,length);
   }
   
   if(n) return -1;
   
   /* Output tag and data */
   
   if(audio)
     n = avi_add_chunk(AVI,(unsigned char *)astr,data,length);
   else
     n = avi_add_chunk(AVI,(unsigned char *)"00db",data,length);
   
   if (n) return -1;
   
   return 0;
}

int AVI_write_frame(avi_t *AVI, char *data, long bytes, int keyframe)
{
  off_t pos;
  
  if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
  
  pos = AVI->pos;

  if(avi_write_data(AVI,data,bytes,0,keyframe)) return -1;
   
  AVI->last_pos = pos;
  AVI->last_len = bytes;
  AVI->video_frames++;
  return 0;
}

int AVI_dup_frame(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }

   if(AVI->last_pos==0) return 0; /* No previous real frame */
   if(avi_add_index_entry(AVI,(unsigned char *)"00db",0x10,AVI->last_pos,AVI->last_len)) return -1;
   AVI->video_frames++;
   AVI->must_use_index = 1;
   return 0;
}

int AVI_write_audio(avi_t *AVI, char *data, long bytes)
{
   if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }

   if( avi_write_data(AVI,data,bytes,1,0) ) return -1;
   AVI->track[AVI->aptr].audio_bytes += bytes;
   AVI->track[AVI->aptr].audio_chunks++;
   return 0;
}


int AVI_append_audio(avi_t *AVI, char *data, long bytes)
{

    // won't work for >2gb
  long i, length, pos;
  unsigned char c[4];

  if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
  
  // update last index entry:
  
  --AVI->n_idx;
  length = str2ulong(AVI->idx[AVI->n_idx]+12);
  pos    = str2ulong(AVI->idx[AVI->n_idx]+8);

  //update;
  long2str(AVI->idx[AVI->n_idx]+12,length+bytes);   

  ++AVI->n_idx;

  AVI->track[AVI->aptr].audio_bytes += bytes;

  //update chunk header
  xio_lseek(AVI->fdes, pos+4, SEEK_SET);
  long2str(c, length+bytes);     
  avi_write(AVI->fdes, (char *)c, 4);

  xio_lseek(AVI->fdes, pos+8+length, SEEK_SET);

  i=PAD_EVEN(length + bytes);

  bytes = i - length;
  avi_write(AVI->fdes, data, bytes);
  AVI->pos = pos + 8 + i;

  return 0;
}


long AVI_bytes_remain(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_READ) return 0;

   return ( AVI_MAX_LEN - (AVI->pos + 8 + 16*AVI->n_idx));
}

long AVI_bytes_written(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_READ) return 0;

   return (AVI->pos + 8 + 16*AVI->n_idx);
}

int AVI_set_audio_track(avi_t *AVI, int track)
{
  
  if(track < 0 || track + 1 > AVI->anum) return(-1);

  //this info is not written to file anyway
  AVI->aptr=track;
  return 0;
}

int AVI_get_audio_track(avi_t *AVI)
{
    return(AVI->aptr);
}

void AVI_set_audio_vbr(avi_t *AVI, long is_vbr)
{
    AVI->track[AVI->aptr].a_vbr = is_vbr;
}

long AVI_get_audio_vbr(avi_t *AVI)
{
    return(AVI->track[AVI->aptr].a_vbr);
}

void AVI_set_comment_fd(avi_t *AVI, int fd)
{
    AVI->comment_fd = fd;
}
int  AVI_get_comment_fd(avi_t *AVI)
{
    return AVI->comment_fd;
}


/*******************************************************************
 *                                                                 *
 *    Utilities for reading video and audio from an AVI File       *
 *                                                                 *
 *******************************************************************/

int AVI_close(avi_t *AVI)
{
   int ret;
   int j,k;

   /* If the file was open for writing, the header and index still have
      to be written */

   if(AVI->mode == AVI_MODE_WRITE)
      ret = avi_close_output_file(AVI);
   else
      ret = 0;

   /* Even if there happened an error, we first clean up */

   if (AVI->comment_fd>0)
       xio_close(AVI->comment_fd);
   AVI->comment_fd = -1;
   xio_close(AVI->fdes);
   if(AVI->idx) free(AVI->idx);
   if(AVI->video_index) free(AVI->video_index);
   if(AVI->video_superindex && AVI->video_superindex->stdindex) {
       for (j = 0; j < NR_IXNN_CHUNKS; j++) {
	   if (AVI->video_superindex->stdindex[j]) {
	       if (AVI->video_superindex->stdindex[j]->aIndex) {
		   free(AVI->video_superindex->stdindex[j]->aIndex);
	       }
	       free(AVI->video_superindex->stdindex[j]);
	   }
       }
       if(AVI->video_superindex->stdindex) free(AVI->video_superindex->stdindex);
       if(AVI->video_superindex->aIndex) free(AVI->video_superindex->aIndex);
       free(AVI->video_superindex);
   }

   for (j=0; j<AVI->anum; j++) 
   {
       if(AVI->track[j].audio_index) free(AVI->track[j].audio_index);
       if(AVI->track[j].audio_superindex) {
	   // shortcut
	   avisuperindex_chunk *a = AVI->track[j].audio_superindex;
	   for (k = 0; k < NR_IXNN_CHUNKS; k++) {
	       if (a->stdindex && a->stdindex[k]) {
		   if (a->stdindex[k]->aIndex) {
		       free(a->stdindex[k]->aIndex);
		   }
		   free(a->stdindex[k]);
	       }
	   }
	   if(a->stdindex) free(a->stdindex);
	   if(a->aIndex) free(a->aIndex);
	   free(a);
       }
   }

   if (AVI->bitmap_info_header)
     free(AVI->bitmap_info_header);
   for (j = 0; j < AVI->anum; j++)
     if (AVI->wave_format_ex[j])
       free(AVI->wave_format_ex[j]);

   free(AVI);
   AVI=NULL;

   return ret;
}


#define ERR_EXIT(x) \
{ \
   AVI_close(AVI); \
   AVI_errno = x; \
   return 0; \
}

avi_t *AVI_open_input_indexfile(char *filename, int getIndex, char *indexfile)
{
  avi_t *AVI=NULL;
  
  /* Create avi_t structure */
  
  AVI = (avi_t *) malloc(sizeof(avi_t));
  if(AVI==NULL)
    {
      AVI_errno = AVI_ERR_NO_MEM;
      return 0;
    }
  memset((void *)AVI,0,sizeof(avi_t));
  
  AVI->mode = AVI_MODE_READ; /* open for reading */
  
  /* Open the file */

#if defined(SYS_WINDOWS)  
  AVI->fdes = open(filename,O_RDONLY|O_BINARY);
#else
  AVI->fdes = xio_open(filename,O_RDONLY);
#endif
  if(AVI->fdes < 0)
    {
      AVI_errno = AVI_ERR_OPEN;
      free(AVI);
      return 0;
    }
  
  AVI->index_file=strdup(indexfile);
  AVI_errno = 0;
  avi_parse_input_file(AVI, getIndex);

  if (AVI != NULL && !AVI_errno) {
      AVI->aptr=0; //reset  
  }

  if (AVI_errno)
      return AVI=NULL;
  else
      return AVI;
}

avi_t *AVI_open_indexfd(int fd, int getIndex, char *indexfile)
{
  avi_t *AVI=NULL;
  
  /* Create avi_t structure */
  
  AVI = (avi_t *) malloc(sizeof(avi_t));
  if(AVI==NULL)
    {
      AVI_errno = AVI_ERR_NO_MEM;
      return 0;
    }
  memset((void *)AVI,0,sizeof(avi_t));
  
  AVI->mode = AVI_MODE_READ; /* open for reading */
  
  // file alread open
  AVI->fdes = fd;
  
  AVI->index_file=strdup(indexfile);
  AVI_errno = 0;
  avi_parse_input_file(AVI, getIndex);

  if (AVI != NULL && !AVI_errno) {
      AVI->aptr=0; //reset
  }
  
  if (AVI_errno)
      return AVI=NULL;
  else
      return AVI;
}


avi_t *AVI_open_input_file(char *filename, int getIndex)
{
  avi_t *AVI=NULL;
  
  /* Create avi_t structure */
  
  AVI = (avi_t *) malloc(sizeof(avi_t));
  if(AVI==NULL)
    {
      AVI_errno = AVI_ERR_NO_MEM;
      return 0;
    }
  memset((void *)AVI,0,sizeof(avi_t));
  
  AVI->mode = AVI_MODE_READ; /* open for reading */
  
  /* Open the file */
  
  AVI->fdes = xio_open(filename,O_RDONLY);
  if(AVI->fdes < 0)
    {
      AVI_errno = AVI_ERR_OPEN;
      free(AVI);
      return 0;
    }
  
  AVI_errno = 0;
  avi_parse_input_file(AVI, getIndex);

  if (AVI != NULL && !AVI_errno) {
      AVI->aptr=0; //reset  
  }

  if (AVI_errno)
      return AVI=NULL;
  else
      return AVI;
}

avi_t *AVI_open_fd(int fd, int getIndex)
{
  avi_t *AVI=NULL;
  
  /* Create avi_t structure */
  
  AVI = (avi_t *) malloc(sizeof(avi_t));
  if(AVI==NULL)
    {
      AVI_errno = AVI_ERR_NO_MEM;
      return 0;
    }
  memset((void *)AVI,0,sizeof(avi_t));
  
  AVI->mode = AVI_MODE_READ; /* open for reading */
  
  // file alread open
  AVI->fdes = fd;
  
  AVI_errno = 0;
  avi_parse_input_file(AVI, getIndex);

  if (AVI != NULL && !AVI_errno) {
      AVI->aptr=0; //reset
  }
  
  if (AVI_errno)
      return AVI=NULL;
  else
      return AVI;
}

// transcode-0.6.8
// reads a file generated by aviindex and builds the index out of it.

int avi_parse_index_from_file(avi_t *AVI, char *filename)
{
    char data[100]; // line buffer
    FILE *fd = NULL; // read from
    off_t pos, len, f_pos, tot_chunks[AVI_MAX_TRACKS];
    int key=0, type;
    int vid_chunks=0, aud_chunks[AVI_MAX_TRACKS];
    long line_count=0;
    char *c, d;
    int i,j;

    for (i=0; i<AVI_MAX_TRACKS; i++) aud_chunks[i] = 0;
    i=0;

    // already have an index -- may be incomplete
    if (AVI->video_index) {
	free(AVI->video_index);
	AVI->video_index = NULL;
    }

    for(j=0; j<AVI->anum; ++j) {
	if(AVI->track[j].audio_index) {
	    free(AVI->track[j].audio_index);
	}
	AVI->track[j].audio_index = NULL;
	AVI->track[j].audio_chunks = 0;
    }   

    if (!(fd = fopen(filename, "r"))) { perror ("avi_parse_index_from_file: fopen"); return -1; }

    // read header
    fgets(data, 100, fd);

    if ( strncasecmp(data, "AVIIDX1", 7) != 0) {
	fprintf(stderr, "%s: Not an AVI index file\n", filename);
	return -1;
    }

    // read comment
    fgets(data, 100, fd);
    f_pos = ftell(fd);
    while (fgets(data, 100, fd)) {
	d = data[5] - '1';
	if        (d == 0) {
	    vid_chunks++;
	} else if (d == 1 || d == 2 || d == 3 || d == 4 ||
		   d == 5 || d == 6 || d == 7 || d == 8  ) {
	    aud_chunks[d-1]++;
	} else 
	    continue;

	line_count++;
    }

    AVI->video_frames = vid_chunks;
    for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_chunks = aud_chunks[j];

    if(AVI->video_frames==0) ERR_EXIT(AVI_ERR_NO_VIDS);
    AVI->video_index = (video_index_entry *) malloc(vid_chunks*sizeof(video_index_entry));
    if(AVI->video_index==0) ERR_EXIT(AVI_ERR_NO_MEM);

    for(j=0; j<AVI->anum; ++j) {
	if(AVI->track[j].audio_chunks) {
	    AVI->track[j].audio_index = (audio_index_entry *) malloc(aud_chunks[j]*sizeof(audio_index_entry));
	    if(AVI->track[j].audio_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
	}
    }   

    // reset after header
    fseek(fd, f_pos, SEEK_SET);

    vid_chunks = 0;
    for(j=0; j<AVI->anum; ++j) aud_chunks[j] = tot_chunks[j] = 0;

    while (fgets(data, 100, fd)) {
	// this is very slow
	// sscanf(data, "%*s %d %*d %*d %lld %lld %d %*f", &type,  &pos, &len, &key);
	c     = strchr (data, ' ');
	type  = strtol(c+1, &c, 10);
	//ch    = strtol(c+1, &c, 10);
	c = strchr(c+1, ' ');
	//chtype= strtol(c+1, &c, 10);
	c = strchr(c+1, ' ');
	pos   = strtoll(c+1, &c, 10);
	len   = strtol(c+1, &c, 10);
	key   = strtol(c+1, &c, 10);
	//ms    = strtod(c+1, NULL);
	i = type-1;

	switch (i) {
	    case 0: // video
		AVI->video_index[vid_chunks].key = (off_t)(key?0x10:0);
		AVI->video_index[vid_chunks].pos = pos+8;
		AVI->video_index[vid_chunks].len = len;
		vid_chunks++;
		break;
	    case 1: case 2: case 3: case 4:
	    case 5: case 6: case 7: case 8:
		j=i-1;
		AVI->track[j].audio_index[aud_chunks[j]].pos = pos+8;
		AVI->track[j].audio_index[aud_chunks[j]].len = len;
		AVI->track[j].audio_index[aud_chunks[j]].tot = tot_chunks[j];
		tot_chunks[j] += AVI->track[j].audio_index[aud_chunks[j]].len;
		aud_chunks[j]++;
		break;
	    default:
		continue;
	}

    }
    for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_bytes = tot_chunks[j];

    fclose (fd);

    return 0;
}

int avi_parse_input_file(avi_t *AVI, int getIndex)
{
  long i, rate, scale, idx_type;
  off_t n;
  unsigned char *hdrl_data;
  long header_offset=0, hdrl_len=0;
  long nvi, nai[AVI_MAX_TRACKS], ioff;
  long tot[AVI_MAX_TRACKS];
  int j;
  int lasttag = 0;
  int vids_strh_seen = 0;
  int vids_strf_seen = 0;
  int auds_strh_seen = 0;
  //  int auds_strf_seen = 0;
  int num_stream = 0;
  char data[256];
  off_t oldpos=-1, newpos=-1;
  
  /* Read first 12 bytes and check that this is an AVI file */

   if( avi_read(AVI->fdes,data,12) != 12 ) ERR_EXIT(AVI_ERR_READ)

   if( strncasecmp(data  ,"RIFF",4) !=0 ||
       strncasecmp(data+8,"AVI ",4) !=0 ) ERR_EXIT(AVI_ERR_NO_AVI)

   /* Go through the AVI file and extract the header list,
      the start position of the 'movi' list and an optionally
      present idx1 tag */

   hdrl_data = 0;


   while(1)
   {
      if( avi_read(AVI->fdes,data,8) != 8 ) break; /* We assume it's EOF */
      newpos=xio_lseek(AVI->fdes,0,SEEK_CUR);
      if(oldpos==newpos) {
	      /* This is a broken AVI stream... */
	      return -1;
      }
      oldpos=newpos;

      n = str2ulong((unsigned char *)data+4);
      n = PAD_EVEN(n);

      if(strncasecmp(data,"LIST",4) == 0)
      {
         if( avi_read(AVI->fdes,data,4) != 4 ) ERR_EXIT(AVI_ERR_READ)
         n -= 4;
         if(strncasecmp(data,"hdrl",4) == 0)
         {
            hdrl_len = n;
            hdrl_data = (unsigned char *) malloc(n);
            if(hdrl_data==0) ERR_EXIT(AVI_ERR_NO_MEM);
				 
	    // offset of header
	    
	    header_offset = xio_lseek(AVI->fdes,0,SEEK_CUR);
				 
            if( avi_read(AVI->fdes,(char *)hdrl_data,n) != n ) ERR_EXIT(AVI_ERR_READ)
         }
         else if(strncasecmp(data,"movi",4) == 0)
         {
            AVI->movi_start = xio_lseek(AVI->fdes,0,SEEK_CUR);
            if (xio_lseek(AVI->fdes,n,SEEK_CUR)==(off_t)-1) break;
         }
         else
            if (xio_lseek(AVI->fdes,n,SEEK_CUR)==(off_t)-1) break;
      }
      else if(strncasecmp(data,"idx1",4) == 0)
      {
         /* n must be a multiple of 16, but the reading does not
            break if this is not the case */

         AVI->n_idx = AVI->max_idx = n/16;
         AVI->idx = (unsigned  char((*)[16]) ) malloc(n);
         if(AVI->idx==0) ERR_EXIT(AVI_ERR_NO_MEM)
         if(avi_read(AVI->fdes, (char *) AVI->idx, n) != n ) {
	     free ( AVI->idx); AVI->idx=NULL;
	     AVI->n_idx = 0;
	 }
      }
      else
         xio_lseek(AVI->fdes,n,SEEK_CUR);
   }

   if(!hdrl_data      ) ERR_EXIT(AVI_ERR_NO_HDRL)
   if(!AVI->movi_start) ERR_EXIT(AVI_ERR_NO_MOVI)

   /* Interpret the header list */

   for(i=0;i<hdrl_len;)
   {
      /* List tags are completly ignored */

#ifdef DEBUG_ODML
      printf("TAG %c%c%c%c\n", (hdrl_data+i)[0], (hdrl_data+i)[1], (hdrl_data+i)[2], (hdrl_data+i)[3]);
#endif

      if(strncasecmp((char *)hdrl_data+i,"LIST",4)==0) { i+= 12; continue; }

      n = str2ulong(hdrl_data+i+4);
      n = PAD_EVEN(n);


      /* Interpret the tag and its args */

      if(strncasecmp((char *)hdrl_data+i,"strh",4)==0)
      {
         i += 8;
#ifdef DEBUG_ODML
	 printf("TAG   %c%c%c%c\n", (hdrl_data+i)[0], (hdrl_data+i)[1], (hdrl_data+i)[2], (hdrl_data+i)[3]);
#endif
         if(strncasecmp((char *)hdrl_data+i,"vids",4) == 0 && !vids_strh_seen)
         {
            memcpy(AVI->compressor,hdrl_data+i+4,4);
            AVI->compressor[4] = 0;

	    // ThOe
	    AVI->v_codech_off = header_offset + i+4;

            scale = str2ulong(hdrl_data+i+20);
            rate  = str2ulong(hdrl_data+i+24);
            if(scale!=0) AVI->fps = (double)rate/(double)scale;
            AVI->video_frames = str2ulong(hdrl_data+i+32);
            AVI->video_strn = num_stream;
	    AVI->max_len = 0;
            vids_strh_seen = 1;
            lasttag = 1; /* vids */
         }
         else if (strncasecmp ((char *)hdrl_data+i,"auds",4) ==0 && ! auds_strh_seen)
         {

	   //inc audio tracks
	   AVI->aptr=AVI->anum;
	   ++AVI->anum;
	   
	   if(AVI->anum > AVI_MAX_TRACKS) {
	     fprintf(stderr, "error - only %d audio tracks supported\n", AVI_MAX_TRACKS);
	     return(-1);
	   }
	   
	   AVI->track[AVI->aptr].audio_bytes = str2ulong(hdrl_data+i+32)*avi_sampsize(AVI, 0);
	   AVI->track[AVI->aptr].audio_strn = num_stream;

	   // if samplesize==0 -> vbr
	   AVI->track[AVI->aptr].a_vbr = !str2ulong(hdrl_data+i+44);

	   AVI->track[AVI->aptr].padrate = str2ulong(hdrl_data+i+24);

	   //	   auds_strh_seen = 1;
	   lasttag = 2; /* auds */
	   
	   // ThOe
	   AVI->track[AVI->aptr].a_codech_off = header_offset + i;
	   
         }
         else if (strncasecmp (hdrl_data+i,"iavs",4) ==0 && ! auds_strh_seen) {
	     fprintf(stderr, "AVILIB: error - DV AVI Type 1 no supported\n");
	     return (-1);
	 }
         else
            lasttag = 0;
         num_stream++;
      }
      else if(strncasecmp(hdrl_data+i,"dmlh",4) == 0) {
	  AVI->total_frames = str2ulong(hdrl_data+i+8);
#ifdef DEBUG_ODML
	 fprintf(stderr, "real number of frames %d\n", AVI->total_frames);
#endif
	 i += 8;
      }
      else if(strncasecmp((char *)hdrl_data+i,"strf",4)==0)
      {
         i += 8;
         if(lasttag == 1)
         {
            alBITMAPINFOHEADER bih;
            
            memcpy(&bih, hdrl_data + i, sizeof(alBITMAPINFOHEADER));
            AVI->bitmap_info_header = (alBITMAPINFOHEADER *)
              malloc(str2ulong((unsigned char *)&bih.bi_size));
            if (AVI->bitmap_info_header != NULL)
              memcpy(AVI->bitmap_info_header, hdrl_data + i,
                     str2ulong((unsigned char *)&bih.bi_size));
            
            AVI->width  = str2ulong(hdrl_data+i+4);
            AVI->height = str2ulong(hdrl_data+i+8);
                    vids_strf_seen = 1;
	    //ThOe
	    AVI->v_codecf_off = header_offset + i+16;

	    memcpy(AVI->compressor2, hdrl_data+i+16, 4);
            AVI->compressor2[4] = 0;

         }
         else if(lasttag == 2)
         {
            alWAVEFORMATEX *wfe;
	    char *nwfe;
            int wfes;
            
            if ((hdrl_len - i) < sizeof(alWAVEFORMATEX))
              wfes = hdrl_len - i;
            else
              wfes = sizeof(alWAVEFORMATEX);
            wfe = (alWAVEFORMATEX *)malloc(sizeof(alWAVEFORMATEX));
            if (wfe != NULL) {
              memset(wfe, 0, sizeof(alWAVEFORMATEX));
	      memcpy(wfe, hdrl_data + i, wfes);
	      if (str2ushort((unsigned char *)&wfe->cb_size) != 0) {
		nwfe = (char *)
                  realloc(wfe, sizeof(alWAVEFORMATEX) +
                          str2ushort((unsigned char *)&wfe->cb_size));
		if (nwfe != 0) {
		  off_t lpos = xio_lseek(AVI->fdes, 0, SEEK_CUR);
		  xio_lseek(AVI->fdes, header_offset + i + sizeof(alWAVEFORMATEX),
			SEEK_SET);
		  wfe = (alWAVEFORMATEX *)nwfe;
		  nwfe = &nwfe[sizeof(alWAVEFORMATEX)];
		  avi_read(AVI->fdes, nwfe,
                           str2ushort((unsigned char *)&wfe->cb_size));
		  xio_lseek(AVI->fdes, lpos, SEEK_SET);
		}
	      }
	      AVI->wave_format_ex[AVI->aptr] = wfe;
	    }

            AVI->track[AVI->aptr].a_fmt   = str2ushort(hdrl_data+i  );

	    //ThOe
	    AVI->track[AVI->aptr].a_codecf_off = header_offset + i;
	    
            AVI->track[AVI->aptr].a_chans = str2ushort(hdrl_data+i+2);
            AVI->track[AVI->aptr].a_rate  = str2ulong (hdrl_data+i+4);
	    //ThOe: read mp3bitrate
	    AVI->track[AVI->aptr].mp3rate = 8*str2ulong(hdrl_data+i+8)/1000;
	    //:ThOe
            AVI->track[AVI->aptr].a_bits  = str2ushort(hdrl_data+i+14);
	    //            auds_strf_seen = 1;
         }
      }
      else if(strncasecmp(hdrl_data+i,"indx",4) == 0) {
	 char *a;
	 int j;

	 if(lasttag == 1) // V I D E O
	 { 

	    a = hdrl_data+i;

	    AVI->video_superindex = (avisuperindex_chunk *) malloc (sizeof (avisuperindex_chunk));
            memset(AVI->video_superindex, 0, sizeof (avisuperindex_chunk));
	    memcpy (AVI->video_superindex->fcc, a, 4);             a += 4;
	    AVI->video_superindex->dwSize = str2ulong(a);          a += 4;
	    AVI->video_superindex->wLongsPerEntry = str2ushort(a); a += 2;
	    AVI->video_superindex->bIndexSubType = *a;             a += 1;
	    AVI->video_superindex->bIndexType = *a;                a += 1;
	    AVI->video_superindex->nEntriesInUse = str2ulong(a);   a += 4;
	    memcpy (AVI->video_superindex->dwChunkId, a, 4);       a += 4;

	    // 3 * reserved
	    a += 4; a += 4; a += 4;

	    if (AVI->video_superindex->bIndexSubType != 0) {fprintf(stderr, "Invalid Header, bIndexSubType != 0\n"); }
	    
	    AVI->video_superindex->aIndex = 
	       malloc (AVI->video_superindex->wLongsPerEntry * AVI->video_superindex->nEntriesInUse * sizeof (uint32_t));

	    // position of ix## chunks
	    for (j=0; j<AVI->video_superindex->nEntriesInUse; ++j) {
	       AVI->video_superindex->aIndex[j].qwOffset = str2ullong (a);  a += 8;
	       AVI->video_superindex->aIndex[j].dwSize = str2ulong (a);     a += 4;
	       AVI->video_superindex->aIndex[j].dwDuration = str2ulong (a); a += 4;

#ifdef DEBUG_ODML
	       printf("[%d] 0x%llx 0x%lx %lu\n", j, 
		       (unsigned long long)AVI->video_superindex->aIndex[j].qwOffset,
		       (unsigned long)AVI->video_superindex->aIndex[j].dwSize, 
		       (unsigned long)AVI->video_superindex->aIndex[j].dwDuration);
#endif
	    }


#ifdef DEBUG_ODML
	    printf("FOURCC \"%c%c%c%c\"\n", AVI->video_superindex->fcc[0], AVI->video_superindex->fcc[1], 
		                            AVI->video_superindex->fcc[2], AVI->video_superindex->fcc[3]);
	    printf("LEN \"%ld\"\n", (long)AVI->video_superindex->dwSize);
	    printf("wLongsPerEntry \"%d\"\n", AVI->video_superindex->wLongsPerEntry);
	    printf("bIndexSubType \"%d\"\n", AVI->video_superindex->bIndexSubType);
	    printf("bIndexType \"%d\"\n", AVI->video_superindex->bIndexType);
	    printf("nEntriesInUse \"%ld\"\n", (long)AVI->video_superindex->nEntriesInUse);
	    printf("dwChunkId \"%c%c%c%c\"\n", AVI->video_superindex->dwChunkId[0], AVI->video_superindex->dwChunkId[1], 
		                               AVI->video_superindex->dwChunkId[2], AVI->video_superindex->dwChunkId[3]);
	    printf("--\n");
#endif

	    AVI->is_opendml = 1;

	 }
         else if(lasttag == 2) // A U D I O
         {

	    a = hdrl_data+i;

	    AVI->track[AVI->aptr].audio_superindex = (avisuperindex_chunk *) malloc (sizeof (avisuperindex_chunk));
	    memcpy (AVI->track[AVI->aptr].audio_superindex->fcc, a, 4);             a += 4;
	    AVI->track[AVI->aptr].audio_superindex->dwSize = str2ulong(a);          a += 4;
	    AVI->track[AVI->aptr].audio_superindex->wLongsPerEntry = str2ushort(a); a += 2;
	    AVI->track[AVI->aptr].audio_superindex->bIndexSubType = *a;             a += 1;
	    AVI->track[AVI->aptr].audio_superindex->bIndexType = *a;                a += 1;
	    AVI->track[AVI->aptr].audio_superindex->nEntriesInUse = str2ulong(a);   a += 4;
	    memcpy (AVI->track[AVI->aptr].audio_superindex->dwChunkId, a, 4);       a += 4;

	    // 3 * reserved
	    a += 4; a += 4; a += 4;

	    if (AVI->track[AVI->aptr].audio_superindex->bIndexSubType != 0) {fprintf(stderr, "Invalid Header, bIndexSubType != 0\n"); }
	    
	    AVI->track[AVI->aptr].audio_superindex->aIndex = 
	       malloc (AVI->track[AVI->aptr].audio_superindex->wLongsPerEntry * 
		     AVI->track[AVI->aptr].audio_superindex->nEntriesInUse * sizeof (uint32_t));

	    // position of ix## chunks
	    for (j=0; j<AVI->track[AVI->aptr].audio_superindex->nEntriesInUse; ++j) {
	       AVI->track[AVI->aptr].audio_superindex->aIndex[j].qwOffset = str2ullong (a);  a += 8;
	       AVI->track[AVI->aptr].audio_superindex->aIndex[j].dwSize = str2ulong (a);     a += 4;
	       AVI->track[AVI->aptr].audio_superindex->aIndex[j].dwDuration = str2ulong (a); a += 4;

#ifdef DEBUG_ODML
	       printf("[%d] 0x%llx 0x%lx %lu\n", j, 
		       (unsigned long long)AVI->track[AVI->aptr].audio_superindex->aIndex[j].qwOffset,
		       (unsigned long)AVI->track[AVI->aptr].audio_superindex->aIndex[j].dwSize, 
		       (unsigned long)AVI->track[AVI->aptr].audio_superindex->aIndex[j].dwDuration);
#endif
	    }

#ifdef DEBUG_ODML
	    printf("FOURCC \"%.4s\"\n", AVI->track[AVI->aptr].audio_superindex->fcc);
	    printf("LEN \"%ld\"\n", (long)AVI->track[AVI->aptr].audio_superindex->dwSize);
	    printf("wLongsPerEntry \"%d\"\n", AVI->track[AVI->aptr].audio_superindex->wLongsPerEntry);
	    printf("bIndexSubType \"%d\"\n", AVI->track[AVI->aptr].audio_superindex->bIndexSubType);
	    printf("bIndexType \"%d\"\n", AVI->track[AVI->aptr].audio_superindex->bIndexType);
	    printf("nEntriesInUse \"%ld\"\n", (long)AVI->track[AVI->aptr].audio_superindex->nEntriesInUse);
	    printf("dwChunkId \"%.4s\"\n", AVI->track[AVI->aptr].audio_superindex->dwChunkId[0]);
	    printf("--\n");
#endif

	 }
	 i += 8;
      }
      else if((strncasecmp(hdrl_data+i,"JUNK",4) == 0) ||
              (strncasecmp(hdrl_data+i,"strn",4) == 0) ||
              (strncasecmp(hdrl_data+i,"vprp",4) == 0)){
	 i += 8;
	 // do not reset lasttag
      } else
      {
         i += 8;
         lasttag = 0;
      }
      //printf("adding %ld bytes\n", (long int)n);

      i += n;
   }

   free(hdrl_data);

   if(!vids_strh_seen || !vids_strf_seen) ERR_EXIT(AVI_ERR_NO_VIDS)

   AVI->video_tag[0] = AVI->video_strn/10 + '0';
   AVI->video_tag[1] = AVI->video_strn%10 + '0';
   AVI->video_tag[2] = 'd';
   AVI->video_tag[3] = 'b';

   /* Audio tag is set to "99wb" if no audio present */
   if(!AVI->track[0].a_chans) AVI->track[0].audio_strn = 99;

   { 
     int i=0;
     for(j=0; j<AVI->anum+1; ++j) {
       if (j == AVI->video_strn) continue;
       AVI->track[i].audio_tag[0] = j/10 + '0';
       AVI->track[i].audio_tag[1] = j%10 + '0';
       AVI->track[i].audio_tag[2] = 'w';
       AVI->track[i].audio_tag[3] = 'b';
       ++i;
     }
   }

   xio_lseek(AVI->fdes,AVI->movi_start,SEEK_SET);

   /* get index if wanted */

   if(AVI->index_file && !getIndex) {
       int ret;

       ret = avi_parse_index_from_file(AVI, AVI->index_file);

       /* Reposition the file */
   
       xio_lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
       AVI->video_pos = 0;
       return (ret);

   }
   if(!getIndex) return(0);

   /* if the file has an idx1, check if this is relative
      to the start of the file or to the start of the movi list */

   idx_type = 0;

   if(AVI->idx)
   {
      off_t pos, len;

      /* Search the first videoframe in the idx1 and look where
         it is in the file */

      for(i=0;i<AVI->n_idx;i++)
         if( strncasecmp((char *)AVI->idx[i],(char *)AVI->video_tag,3)==0 ) break;
      if(i>=AVI->n_idx) ERR_EXIT(AVI_ERR_NO_VIDS)

      pos = str2ulong(AVI->idx[i]+ 8);
      len = str2ulong(AVI->idx[i]+12);

      xio_lseek(AVI->fdes,pos,SEEK_SET);
      if(avi_read(AVI->fdes,data,8)!=8) ERR_EXIT(AVI_ERR_READ)
      if( strncasecmp(data,(char *)AVI->idx[i],4)==0 && str2ulong((unsigned char *)data+4)==len )
      {
         idx_type = 1; /* Index from start of file */
      }
      else
      {
         xio_lseek(AVI->fdes,pos+AVI->movi_start-4,SEEK_SET);
         if(avi_read(AVI->fdes,data,8)!=8) ERR_EXIT(AVI_ERR_READ)
         if( strncasecmp(data,(char *)AVI->idx[i],4)==0 && str2ulong((unsigned char *)data+4)==len )
         {
            idx_type = 2; /* Index from start of movi list */
         }
      }
      /* idx_type remains 0 if neither of the two tests above succeeds */
   }


   if(idx_type == 0 && !AVI->is_opendml && !AVI->total_frames)
   {
      /* we must search through the file to get the index */

      xio_lseek(AVI->fdes, AVI->movi_start, SEEK_SET);

      AVI->n_idx = 0;

      while(1)
      {
         if( avi_read(AVI->fdes,data,8) != 8 ) break;
         n = str2ulong((unsigned char *)data+4);

         /* The movi list may contain sub-lists, ignore them */

         if(strncasecmp(data,"LIST",4)==0)
         {
            xio_lseek(AVI->fdes,4,SEEK_CUR);
            continue;
         }

         /* Check if we got a tag ##db, ##dc or ##wb */
	 
         if( ( (data[2]=='d' || data[2]=='D') &&
               (data[3]=='b' || data[3]=='B' || data[3]=='c' || data[3]=='C') )
	     || ( (data[2]=='w' || data[2]=='W') &&
		  (data[3]=='b' || data[3]=='B') ) )
	   {
	   avi_add_index_entry(AVI,(unsigned char *)data,0,xio_lseek(AVI->fdes,0,SEEK_CUR)-8,n);
         }
	 
         xio_lseek(AVI->fdes,PAD_EVEN(n),SEEK_CUR);
      }
      idx_type = 1;
   }

   // ************************
   // OPENDML
   // ************************

   // read extended index chunks
   if (AVI->is_opendml) {
      uint64_t offset = 0;
      int hdrl_len = 4+4+2+1+1+4+4+8+4;
      char *en, *chunk_start;
      int k = 0, audtr = 0;
      uint32_t nrEntries = 0;

      AVI->video_index = NULL;

      nvi = 0;
      for(audtr=0; audtr<AVI->anum; ++audtr) nai[audtr] = tot[audtr] = 0; 

      // ************************
      // VIDEO
      // ************************

      for (j=0; j<AVI->video_superindex->nEntriesInUse; j++) {

	 // read from file
	 chunk_start = en = malloc (AVI->video_superindex->aIndex[j].dwSize+hdrl_len);

	 if (xio_lseek(AVI->fdes, AVI->video_superindex->aIndex[j].qwOffset, SEEK_SET) == (off_t)-1) {
	    fprintf(stderr, "(%s) cannot seek to 0x%llx\n", __FILE__, 
		    (unsigned long long)AVI->video_superindex->aIndex[j].qwOffset);
	    free(chunk_start);
	    continue;
	 }

	 if (avi_read(AVI->fdes, en, AVI->video_superindex->aIndex[j].dwSize+hdrl_len) <= 0) {
	    fprintf(stderr, "(%s) cannot read from offset 0x%llx %ld bytes; broken (incomplete) file?\n", 
		  __FILE__, (unsigned long long)AVI->video_superindex->aIndex[j].qwOffset,
		  (unsigned long)AVI->video_superindex->aIndex[j].dwSize+hdrl_len);
	    free(chunk_start);
	    continue;
	 }

	 nrEntries = str2ulong(en + 12);
#ifdef DEBUG_ODML
	 //printf("[%d:0] Video nrEntries %ld\n", j, nrEntries);
#endif
	 offset = str2ullong(en + 20);

	 // skip header
	 en += hdrl_len;
	 nvi += nrEntries;
	 AVI->video_index = (video_index_entry *) realloc (AVI->video_index, nvi * sizeof (video_index_entry));
	 if (!AVI->video_index) {
		 fprintf(stderr, "AVILIB: out of mem (size = %ld)\n", nvi * sizeof (video_index_entry));
		 exit(1);
	 }

	 while (k < nvi) {

	    AVI->video_index[k].pos = offset + str2ulong(en); en += 4;
	    AVI->video_index[k].len = str2ulong_len(en);
	    AVI->video_index[k].key = str2ulong_key(en); en += 4;

	    // completely empty chunk
	    if (AVI->video_index[k].pos-offset == 0 && AVI->video_index[k].len == 0) {
		k--;
		nvi--;
	    }

#ifdef DEBUG_ODML
	    /*
	    printf("[%d] POS 0x%llX len=%d key=%s offset (%llx) (%ld)\n", k, 
		  AVI->video_index[k].pos, 
		  (int)AVI->video_index[k].len, 
		  AVI->video_index[k].key?"yes":"no ", offset, 
		  AVI->video_superindex->aIndex[j].dwSize); 
		  */
#endif

	    k++;
	 }

	 free(chunk_start);
      }

      AVI->video_frames = nvi;
      // this should deal with broken 'rec ' odml files.
      if (AVI->video_frames == 0) {
	  AVI->is_opendml=0;
	  goto multiple_riff;
      }
 
      // ************************
      // AUDIO 
      // ************************

      for(audtr=0; audtr<AVI->anum; ++audtr) {

	 k = 0;
	 if (!AVI->track[audtr].audio_superindex) {
	       fprintf(stderr, "(%s) cannot read audio index for track %d\n", __FILE__, audtr);
	       continue;
	 }
	 for (j=0; j<AVI->track[audtr].audio_superindex->nEntriesInUse; j++) {

	    // read from file
	    chunk_start = en = malloc (AVI->track[audtr].audio_superindex->aIndex[j].dwSize+hdrl_len);

	    if (xio_lseek(AVI->fdes, AVI->track[audtr].audio_superindex->aIndex[j].qwOffset, SEEK_SET) == (off_t)-1) {
	       fprintf(stderr, "(%s) cannot seek to 0x%llx\n", __FILE__, (unsigned long long)AVI->track[audtr].audio_superindex->aIndex[j].qwOffset);
	       free(chunk_start);
	       continue;
	    }

	    if (avi_read(AVI->fdes, en, AVI->track[audtr].audio_superindex->aIndex[j].dwSize+hdrl_len) <= 0) {
	       fprintf(stderr, "(%s) cannot read from offset 0x%llx; broken (incomplete) file?\n", 
		     __FILE__,(unsigned long long) AVI->track[audtr].audio_superindex->aIndex[j].qwOffset);
	       free(chunk_start);
	       continue;
	    }

	    nrEntries = str2ulong(en + 12);
	    //if (nrEntries > 50) nrEntries = 2; // XXX
#ifdef DEBUG_ODML
	    //printf("[%d:%d] Audio nrEntries %ld\n", j, audtr, nrEntries);
#endif
	    offset = str2ullong(en + 20);

	    // skip header
	    en += hdrl_len;
	    nai[audtr] += nrEntries;
	    AVI->track[audtr].audio_index = (audio_index_entry *) realloc (AVI->track[audtr].audio_index, nai[audtr] * sizeof (audio_index_entry));

	    while (k < nai[audtr]) {

	       AVI->track[audtr].audio_index[k].pos = offset + str2ulong(en); en += 4;
	       AVI->track[audtr].audio_index[k].len = str2ulong_len(en); en += 4;
	       AVI->track[audtr].audio_index[k].tot = tot[audtr];
	       tot[audtr] += AVI->track[audtr].audio_index[k].len;

#ifdef DEBUG_ODML
	       /*
		  printf("[%d:%d] POS 0x%llX len=%d offset (%llx) (%ld)\n", k, audtr, 
		  AVI->track[audtr].audio_index[k].pos, 
		  (int)AVI->track[audtr].audio_index[k].len, 
		  offset, AVI->track[audtr].audio_superindex->aIndex[j].dwSize); 
		  */
#endif

	       ++k;
	    }

	    free(chunk_start);
	 }
	 
	 AVI->track[audtr].audio_chunks = nai[audtr];
	 AVI->track[audtr].audio_bytes = tot[audtr];
      }
   } // is opendml

   else if (AVI->total_frames && !AVI->is_opendml && idx_type==0) {

   // *********************
   // MULTIPLE RIFF CHUNKS (and no index)
   // *********************
   
      long aud_chunks = 0;
multiple_riff:

      xio_lseek(AVI->fdes, AVI->movi_start, SEEK_SET);

      AVI->n_idx = 0;

      fprintf(stderr, "[avilib] Reconstructing index...");

      // Number of frames; only one audio track supported
      nvi = AVI->video_frames = AVI->total_frames;
      nai[0] = AVI->track[0].audio_chunks = AVI->total_frames;
      for(j=1; j<AVI->anum; ++j) AVI->track[j].audio_chunks = 0;

      AVI->video_index = (video_index_entry *) malloc(nvi*sizeof(video_index_entry));

      if(AVI->video_index==0) ERR_EXIT(AVI_ERR_NO_MEM);

      for(j=0; j<AVI->anum; ++j) {
	  if(AVI->track[j].audio_chunks) {
	      AVI->track[j].audio_index = (audio_index_entry *) malloc((nai[j]+1)*sizeof(audio_index_entry));
	      memset(AVI->track[j].audio_index, 0, (nai[j]+1)*(sizeof(audio_index_entry)));
	      if(AVI->track[j].audio_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
	  }
      }   

      nvi = 0;
      for(j=0; j<AVI->anum; ++j) nai[j] = tot[j] = 0;

      aud_chunks = AVI->total_frames;

      while(1)
      {
	 if (nvi >= AVI->total_frames) break;

         if( avi_read(AVI->fdes,data,8) != 8 ) break;
         n = str2ulong((unsigned char *)data+4);


	 j=0;

	 if (aud_chunks - nai[j] -1 <= 0) {
	     aud_chunks += AVI->total_frames;
	     AVI->track[j].audio_index = (audio_index_entry *) 
		 realloc( AVI->track[j].audio_index, (aud_chunks+1)*sizeof(audio_index_entry));
	     if (!AVI->track[j].audio_index) {
		 fprintf(stderr, "Internal error in avilib -- no mem\n");
		 AVI_errno = AVI_ERR_NO_MEM;
		 return -1;
	     }
	 }

         /* Check if we got a tag ##db, ##dc or ##wb */
	 
	 // VIDEO
         if( 
	     (data[0]=='0' || data[1]=='0') &&
	     (data[2]=='d' || data[2]=='D') &&
             (data[3]=='b' || data[3]=='B' || data[3]=='c' || data[3]=='C') ) {

	     AVI->video_index[nvi].key = 0x0;
	     AVI->video_index[nvi].pos = xio_lseek(AVI->fdes,0,SEEK_CUR);
	     AVI->video_index[nvi].len = n;

	     /*
	     fprintf(stderr, "Frame %ld pos %lld len %lld key %ld\n",
		     nvi, AVI->video_index[nvi].pos,  AVI->video_index[nvi].len, (long)AVI->video_index[nvi].key);
		     */
	     nvi++;
	     xio_lseek(AVI->fdes,PAD_EVEN(n),SEEK_CUR);
	 } 

	 //AUDIO
	 else if( 
		 (data[0]=='0' || data[1]=='1') &&
		 (data[2]=='w' || data[2]=='W') &&
	     (data[3]=='b' || data[3]=='B') ) {


		AVI->track[j].audio_index[nai[j]].pos = xio_lseek(AVI->fdes,0,SEEK_CUR);
		AVI->track[j].audio_index[nai[j]].len = n;
		AVI->track[j].audio_index[nai[j]].tot = tot[j];
		tot[j] += AVI->track[j].audio_index[nai[j]].len;
		nai[j]++;

		xio_lseek(AVI->fdes,PAD_EVEN(n),SEEK_CUR);
	 }
	 else {
            xio_lseek(AVI->fdes,-4,SEEK_CUR);
	 }

      }
      if (nvi < AVI->total_frames) {
	  fprintf(stderr, "\n[avilib] Uh? Some frames seems missing (%ld/%d)\n", 
		  nvi,  AVI->total_frames);
      }


      AVI->video_frames = nvi;
      AVI->track[0].audio_chunks = nai[0];

      for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_bytes = tot[j];
      idx_type = 1;
      fprintf(stderr, "done. nvi=%ld nai=%ld tot=%ld\n", nvi, nai[0], tot[0]);

   } // total_frames but no indx chunk (xawtv does this)

   else

   {
   // ******************
   // NO OPENDML
   // ******************
   
   /* Now generate the video index and audio index arrays */

   nvi = 0;
   for(j=0; j<AVI->anum; ++j) nai[j] = 0;

   for(i=0;i<AVI->n_idx;i++) {
     
     if(strncasecmp((char *)AVI->idx[i],AVI->video_tag,3) == 0) nvi++;
     
     for(j=0; j<AVI->anum; ++j) if(strncasecmp((char *)AVI->idx[i], AVI->track[j].audio_tag,4) == 0) nai[j]++;
   }
   
   AVI->video_frames = nvi;
   for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_chunks = nai[j];
  

   if(AVI->video_frames==0) ERR_EXIT(AVI_ERR_NO_VIDS);
   AVI->video_index = (video_index_entry *) malloc(nvi*sizeof(video_index_entry));
   if(AVI->video_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
   
   for(j=0; j<AVI->anum; ++j) {
       if(AVI->track[j].audio_chunks) {
	   AVI->track[j].audio_index = (audio_index_entry *) malloc((nai[j]+1)*sizeof(audio_index_entry));
	   memset(AVI->track[j].audio_index, 0, (nai[j]+1)*(sizeof(audio_index_entry)));
	   if(AVI->track[j].audio_index==0) ERR_EXIT(AVI_ERR_NO_MEM);
       }
   }   
   
   nvi = 0;
   for(j=0; j<AVI->anum; ++j) nai[j] = tot[j] = 0;
   
   ioff = idx_type == 1 ? 8 : AVI->movi_start+4;
   
   for(i=0;i<AVI->n_idx;i++) {

     //video
     if(strncasecmp((char *)AVI->idx[i],AVI->video_tag,3) == 0) {
       AVI->video_index[nvi].key = str2ulong(AVI->idx[i]+ 4);
       AVI->video_index[nvi].pos = str2ulong(AVI->idx[i]+ 8)+ioff;
       AVI->video_index[nvi].len = str2ulong(AVI->idx[i]+12);
       nvi++;
     }
     
     //audio
     for(j=0; j<AVI->anum; ++j) {
	 
       if(strncasecmp((char *)AVI->idx[i],AVI->track[j].audio_tag,4) == 0) {
	 AVI->track[j].audio_index[nai[j]].pos = str2ulong(AVI->idx[i]+ 8)+ioff;
	 AVI->track[j].audio_index[nai[j]].len = str2ulong(AVI->idx[i]+12);
	 AVI->track[j].audio_index[nai[j]].tot = tot[j];
	 tot[j] += AVI->track[j].audio_index[nai[j]].len;
	 nai[j]++;
       }
     }
   }
   
   
   for(j=0; j<AVI->anum; ++j) AVI->track[j].audio_bytes = tot[j];

   } // is no opendml

   /* Reposition the file */
   
   xio_lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
   AVI->video_pos = 0;

   return(0);
}

long AVI_video_frames(avi_t *AVI)
{
   return AVI->video_frames;
}
int  AVI_video_width(avi_t *AVI)
{
   return AVI->width;
}
int  AVI_video_height(avi_t *AVI)
{
   return AVI->height;
}
double AVI_frame_rate(avi_t *AVI)
{
   return AVI->fps;
}
char* AVI_video_compressor(avi_t *AVI)
{
   return AVI->compressor2;
}

long AVI_max_video_chunk(avi_t *AVI)
{
   return AVI->max_len; 
}

int AVI_audio_tracks(avi_t *AVI)
{
    return(AVI->anum);
}

int AVI_audio_channels(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_chans;
}

long AVI_audio_mp3rate(avi_t *AVI)
{
   return AVI->track[AVI->aptr].mp3rate;
}

long AVI_audio_padrate(avi_t *AVI)
{
   return AVI->track[AVI->aptr].padrate;
}

int AVI_audio_bits(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_bits;
}

int AVI_audio_format(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_fmt;
}

long AVI_audio_rate(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_rate;
}

long AVI_audio_bytes(avi_t *AVI)
{
   return AVI->track[AVI->aptr].audio_bytes;
}

long AVI_audio_chunks(avi_t *AVI)
{
   return AVI->track[AVI->aptr].audio_chunks;
}

long AVI_audio_codech_offset(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_codech_off;
}

long AVI_audio_codecf_offset(avi_t *AVI)
{
   return AVI->track[AVI->aptr].a_codecf_off;
}

long  AVI_video_codech_offset(avi_t *AVI)
{
    return AVI->v_codech_off;
}

long  AVI_video_codecf_offset(avi_t *AVI)
{
    return AVI->v_codecf_off;
}

long AVI_frame_size(avi_t *AVI, long frame)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->video_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if(frame < 0 || frame >= AVI->video_frames) return 0;
   return(AVI->video_index[frame].len);
}

long AVI_audio_size(avi_t *AVI, long frame)
{
  if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
  if(!AVI->track[AVI->aptr].audio_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }
  
  if(frame < 0 || frame >= AVI->track[AVI->aptr].audio_chunks) return -1;
  return(AVI->track[AVI->aptr].audio_index[frame].len);
}

long AVI_get_video_position(avi_t *AVI, long frame)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->video_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if(frame < 0 || frame >= AVI->video_frames) return 0;
   return(AVI->video_index[frame].pos);
}


int AVI_seek_start(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }

   xio_lseek(AVI->fdes,AVI->movi_start,SEEK_SET);
   AVI->video_pos = 0;
   return 0;
}

int AVI_set_video_position(avi_t *AVI, long frame)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->video_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if (frame < 0 ) frame = 0;
   AVI->video_pos = frame;
   return 0;
}

int AVI_set_audio_bitrate(avi_t *AVI, long bitrate)
{
   if(AVI->mode==AVI_MODE_READ) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }

   AVI->track[AVI->aptr].mp3rate = bitrate;
   return 0;
}
      

long AVI_read_frame(avi_t *AVI, char *vidbuf, int *keyframe)
{
   long n;

   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->video_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if(AVI->video_pos < 0 || AVI->video_pos >= AVI->video_frames) return -1;
   n = AVI->video_index[AVI->video_pos].len;

   *keyframe = (AVI->video_index[AVI->video_pos].key==0x10) ? 1:0;

   if (vidbuf == NULL) {
     AVI->video_pos++;
     return n;
   }

   xio_lseek(AVI->fdes, AVI->video_index[AVI->video_pos].pos, SEEK_SET);

   if (avi_read(AVI->fdes,vidbuf,n) != n)
   {
      AVI_errno = AVI_ERR_READ;
      return -1;
   }

   AVI->video_pos++;

   return n;
}

long AVI_get_audio_position_index(avi_t *AVI)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->track[AVI->aptr].audio_index) { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   return (AVI->track[AVI->aptr].audio_posc);
}

int AVI_set_audio_position_index(avi_t *AVI, long indexpos)
{
   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->track[AVI->aptr].audio_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }
   if(indexpos > AVI->track[AVI->aptr].audio_chunks)     { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   AVI->track[AVI->aptr].audio_posc = indexpos;
   AVI->track[AVI->aptr].audio_posb = 0;

   return 0;
}


int AVI_set_audio_position(avi_t *AVI, long byte)
{
   long n0, n1, n;

   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->track[AVI->aptr].audio_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if(byte < 0) byte = 0;

   /* Binary search in the audio chunks */

   n0 = 0;
   n1 = AVI->track[AVI->aptr].audio_chunks;

   while(n0<n1-1)
   {
      n = (n0+n1)/2;
      if(AVI->track[AVI->aptr].audio_index[n].tot>byte)
         n1 = n;
      else
         n0 = n;
   }

   AVI->track[AVI->aptr].audio_posc = n0;
   AVI->track[AVI->aptr].audio_posb = byte - AVI->track[AVI->aptr].audio_index[n0].tot;

   return 0;
}

long AVI_read_audio(avi_t *AVI, char *audbuf, long bytes)
{
   long nr, left, todo;
   off_t pos;

   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->track[AVI->aptr].audio_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   nr = 0; /* total number of bytes read */

   if (bytes==0) {
     AVI->track[AVI->aptr].audio_posc++;
     AVI->track[AVI->aptr].audio_posb = 0;
      xio_lseek(AVI->fdes, 0LL, SEEK_CUR);
   }
   while(bytes>0)
   {
       off_t ret;
      left = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].len - AVI->track[AVI->aptr].audio_posb;
      if(left==0)
      {
         if(AVI->track[AVI->aptr].audio_posc>=AVI->track[AVI->aptr].audio_chunks-1) return nr;
         AVI->track[AVI->aptr].audio_posc++;
         AVI->track[AVI->aptr].audio_posb = 0;
         continue;
      }
      if(bytes<left)
         todo = bytes;
      else
         todo = left;
      pos = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].pos + AVI->track[AVI->aptr].audio_posb;
      xio_lseek(AVI->fdes, pos, SEEK_SET);
      if ( (ret = avi_read(AVI->fdes,audbuf+nr,todo)) != todo)
      {
	 fprintf(stderr, "XXX pos = %lld, ret = %lld, todo = %ld\n", pos, ret, todo);
         AVI_errno = AVI_ERR_READ;
         return -1;
      }
      bytes -= todo;
      nr    += todo;
      AVI->track[AVI->aptr].audio_posb += todo;
   }

   return nr;
}

long AVI_read_audio_chunk(avi_t *AVI, char *audbuf)
{
   long left;
   off_t pos;

   if(AVI->mode==AVI_MODE_WRITE) { AVI_errno = AVI_ERR_NOT_PERM; return -1; }
   if(!AVI->track[AVI->aptr].audio_index)         { AVI_errno = AVI_ERR_NO_IDX;   return -1; }

   if (AVI->track[AVI->aptr].audio_posc+1>AVI->track[AVI->aptr].audio_chunks) return -1;

   left = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].len - AVI->track[AVI->aptr].audio_posb;
   
   if (audbuf == NULL) return left;
   
   if(left==0) {
       AVI->track[AVI->aptr].audio_posc++;
       AVI->track[AVI->aptr].audio_posb = 0;
       return 0;
   }

   pos = AVI->track[AVI->aptr].audio_index[AVI->track[AVI->aptr].audio_posc].pos + AVI->track[AVI->aptr].audio_posb;
   xio_lseek(AVI->fdes, pos, SEEK_SET);
   if (avi_read(AVI->fdes,audbuf,left) != left)
   {
      AVI_errno = AVI_ERR_READ;
      return -1;
   }
   AVI->track[AVI->aptr].audio_posc++;
   AVI->track[AVI->aptr].audio_posb = 0;

   return left;
}

/* AVI_read_data: Special routine for reading the next audio or video chunk
                  without having an index of the file. */

int AVI_read_data(avi_t *AVI, char *vidbuf, long max_vidbuf,
                              char *audbuf, long max_audbuf,
                              long *len)
{

/*
 * Return codes:
 *
 *    1 = video data read
 *    2 = audio data read
 *    0 = reached EOF
 *   -1 = video buffer too small
 *   -2 = audio buffer too small
 */

   off_t n;
   char data[8];
 
   if(AVI->mode==AVI_MODE_WRITE) return 0;

   while(1)
   {
      /* Read tag and length */

      if( avi_read(AVI->fdes,data,8) != 8 ) return 0;

      /* if we got a list tag, ignore it */

      if(strncasecmp(data,"LIST",4) == 0)
      {
         xio_lseek(AVI->fdes,4,SEEK_CUR);
         continue;
      }

      n = PAD_EVEN(str2ulong((unsigned char *)data+4));

      if(strncasecmp(data,AVI->video_tag,3) == 0)
      {
         *len = n;
         AVI->video_pos++;
         if(n>max_vidbuf)
         {
            xio_lseek(AVI->fdes,n,SEEK_CUR);
            return -1;
         }
         if(avi_read(AVI->fdes,vidbuf,n) != n ) return 0;
         return 1;
      }
      else if(strncasecmp(data,AVI->track[AVI->aptr].audio_tag,4) == 0)
      {
         *len = n;
         if(n>max_audbuf)
         {
            xio_lseek(AVI->fdes,n,SEEK_CUR);
            return -2;
         }
         if(avi_read(AVI->fdes,audbuf,n) != n ) return 0;
         return 2;
         break;
      }
      else
         if(xio_lseek(AVI->fdes,n,SEEK_CUR)<0)  return 0;
   }
}

/* AVI_print_error: Print most recent error (similar to perror) */

char *(avi_errors[]) =
{
  /*  0 */ "avilib - No Error",
  /*  1 */ "avilib - AVI file size limit reached",
  /*  2 */ "avilib - Error opening AVI file",
  /*  3 */ "avilib - Error reading from AVI file",
  /*  4 */ "avilib - Error writing to AVI file",
  /*  5 */ "avilib - Error writing index (file may still be useable)",
  /*  6 */ "avilib - Error closing AVI file",
  /*  7 */ "avilib - Operation (read/write) not permitted",
  /*  8 */ "avilib - Out of memory (malloc failed)",
  /*  9 */ "avilib - Not an AVI file",
  /* 10 */ "avilib - AVI file has no header list (corrupted?)",
  /* 11 */ "avilib - AVI file has no MOVI list (corrupted?)",
  /* 12 */ "avilib - AVI file has no video data",
  /* 13 */ "avilib - operation needs an index",
  /* 14 */ "avilib - Unkown Error"
};
static int num_avi_errors = sizeof(avi_errors)/sizeof(char*);

static char error_string[4096];

void AVI_print_error(char *str)
{
   int aerrno;

   aerrno = (AVI_errno>=0 && AVI_errno<num_avi_errors) ? AVI_errno : num_avi_errors-1;

   if (aerrno != 0)
       fprintf(stderr,"%s: %s\n",str,avi_errors[aerrno]);

   /* for the following errors, perror should report a more detailed reason: */

   if(AVI_errno == AVI_ERR_OPEN ||
      AVI_errno == AVI_ERR_READ ||
      AVI_errno == AVI_ERR_WRITE ||
      AVI_errno == AVI_ERR_WRITE_INDEX ||
      AVI_errno == AVI_ERR_CLOSE )
   {
      perror("REASON");
   }
}

char *AVI_strerror(void)
{
   int aerrno;

   aerrno = (AVI_errno>=0 && AVI_errno<num_avi_errors) ? AVI_errno : num_avi_errors-1;

   if(AVI_errno == AVI_ERR_OPEN ||
      AVI_errno == AVI_ERR_READ ||
      AVI_errno == AVI_ERR_WRITE ||
      AVI_errno == AVI_ERR_WRITE_INDEX ||
      AVI_errno == AVI_ERR_CLOSE )
   {
      snprintf(error_string, sizeof(error_string), "%s - %s",avi_errors[aerrno],strerror(errno));
      return error_string;
   }
   else
   {
      return avi_errors[aerrno];
   }
}

uint64_t AVI_max_size(void)
{
  return((uint64_t) AVI_MAX_LEN);
}

#if 0

// This expression is a compile-time constraint.  It will force a
// compiler error, if the condition (the correct size of the struct
// wave_header) is not met.  The reason that this may fail is
// structure padding.  If it happens, the code should be changed to
// use a byte array for the raw data, instead of doing the fixup
// in-place.
typedef char struct_packing_constraint [
    44 == sizeof(struct wave_header) ? 1 : -1];
#endif

int AVI_read_wave_header( int fd, struct wave_header * wave )
{
    char buf[44];
    // read raw data
    if( avi_read (fd, buf, 44) != 44)
    {
	AVI_errno = AVI_ERR_READ;
	return -1;
    }

    memcpy(&wave->riff.id      ,buf+0, 4);
    memcpy(&wave->riff.len     ,buf+4, 4);
    memcpy(&wave->riff.wave_id ,buf+8, 4);

    memcpy(&wave->format.id    ,buf+12, 4);
    memcpy(&wave->format.len   ,buf+16, 4);

    memcpy(&wave->common.wFormatTag       ,buf+20, 2);
    memcpy(&wave->common.wChannels        ,buf+22, 2);
    memcpy(&wave->common.dwSamplesPerSec  ,buf+24, 4);
    memcpy(&wave->common.dwAvgBytesPerSec ,buf+28, 4);
    memcpy(&wave->common.wBlockAlign      ,buf+32, 2);
    memcpy(&wave->common.wBitsPerSample   ,buf+34, 2);

    memcpy(&wave->data.id  ,buf+36, 4);
    memcpy(&wave->data.len ,buf+40, 4);


    /*
    fprintf(stderr, "RIFF: %c%c%c%c| (%d) (%d)\n", 
	    wave->riff.id[0], wave->riff.id[1], wave->riff.id[2], wave->riff.id[3],
	    sizeof (*wave), sizeof (struct wave_header));
    fprintf(stderr, "WAVE: %c%c%c%c|\n", 
	    wave->riff.wave_id[0], wave->riff.wave_id[1], wave->riff.wave_id[2], wave->riff.wave_id[3]);
    fprintf(stderr, "fmt : %c%c%c%c|\n", 
	    wave->format.id[0], wave->format.id[1], wave->format.id[2], wave->format.id[3]);
    fprintf(stderr, "data: %c%c%c%c|\n", 
	    wave->data.id[0], wave->data.id[1], wave->data.id[2], wave->data.id[3]);
	    */

    if( strncasecmp(wave->riff.id     , "RIFF",4) != 0 ||
	strncasecmp(wave->riff.wave_id, "WAVE",4) != 0 ||
	strncasecmp(wave->format.id   , "fmt ",4) != 0 )
    {
	AVI_errno = AVI_ERR_NO_AVI;
	return -1;
    }

#ifdef WORDS_BIGENDIAN
#define x_FIXUP(field) \
    ((field) = (sizeof(field) == 4 ? str2ulong((unsigned char*)&(field)) \
				   : str2ushort((unsigned char*)&(field))))

    x_FIXUP(wave->riff.len);
    x_FIXUP(wave->format.len);
    x_FIXUP(wave->common.wFormatTag);
    x_FIXUP(wave->common.wChannels);
    x_FIXUP(wave->common.dwSamplesPerSec);
    x_FIXUP(wave->common.dwAvgBytesPerSec);
    x_FIXUP(wave->common.wBlockAlign);
    x_FIXUP(wave->common.wBitsPerSample);
    x_FIXUP(wave->data.len);

#undef x_FIXUP
#endif

    return 0;
}

int AVI_write_wave_header( int fd, const struct wave_header * wave )
{
    char buf[44];
    struct wave_header buffer = *wave;



#ifdef WORDS_BIGENDIAN
#define x_FIXUP(field) \
    ((sizeof(field) == 4 ? long2str((unsigned char*)&(field),(field)) \
			 : short2str((unsigned char*)&(field),(field))))

    x_FIXUP(buffer.riff.len);
    x_FIXUP(buffer.format.len);
    x_FIXUP(buffer.common.wFormatTag);
    x_FIXUP(buffer.common.wChannels);
    x_FIXUP(buffer.common.dwSamplesPerSec);
    x_FIXUP(buffer.common.dwAvgBytesPerSec);
    x_FIXUP(buffer.common.wBlockAlign);
    x_FIXUP(buffer.common.wBitsPerSample);
    x_FIXUP(buffer.data.len);

#undef x_FIXUP
#endif

    memcpy(buf+ 0, &buffer.riff.id, 4);
    memcpy(buf+ 4, &buffer.riff.len, 4);
    memcpy(buf+ 8, &buffer.riff.wave_id, 4);

    memcpy(buf+12, &buffer.format.id, 4);
    memcpy(buf+16, &buffer.format.len, 4);

    memcpy(buf+20, &buffer.common.wFormatTag, 2);
    memcpy(buf+22, &buffer.common.wChannels, 2);
    memcpy(buf+24, &buffer.common.dwSamplesPerSec, 4);
    memcpy(buf+28, &buffer.common.dwAvgBytesPerSec, 4);
    memcpy(buf+32, &buffer.common.wBlockAlign, 2);
    memcpy(buf+34, &buffer.common.wBitsPerSample, 2);

    memcpy(buf+36, &buffer.data.id, 4);
    memcpy(buf+40, &buffer.data.len, 4);


    // write raw data
    if( avi_write (fd, buf, sizeof(buf)) != sizeof(buf) )
    {
	AVI_errno = AVI_ERR_WRITE;
	return -1;
    }

    return 0;
}

size_t AVI_read_wave_pcm_data( int fd, void * buffer, size_t buflen )
{
    int doneread = avi_read(fd, buffer, buflen);

#ifdef WORDS_BIGENDIAN
    {
	char * bufptr = buffer;
	size_t i;
	char tmp;
    
	for( i=0; i<doneread; i+=2 )
	{
	    tmp = bufptr[i];
	    bufptr[i] = bufptr[i+1];
	    bufptr[i+1] = tmp;
	}
    }
#endif

    return doneread;
}

size_t AVI_write_wave_pcm_data( int fd, const void * data, size_t datalen )
{
    size_t totalwritten = 0;

#ifdef WORDS_BIGENDIAN
    const char * inptr = data;
    char buffer[2048];
    size_t i, buflen, donewritten;

    while( datalen>0 )
    {
	buflen = datalen;
	if( buflen > sizeof(buffer) )
	{
	    buflen = sizeof(buffer);
	}

	for( i=0; i<buflen; i+=2 )
	{
	    buffer[i]   = inptr[i+1];
	    buffer[i+1] = inptr[i];
	}

	donewritten = avi_write(fd, buffer, buflen);
	totalwritten += donewritten;
	if( buflen != donewritten )
	{
	    AVI_errno = AVI_ERR_WRITE;
	    return totalwritten;
	}

	datalen -= buflen;
	inptr += buflen;
    }
#else
    totalwritten = avi_write(fd, (char *)data, datalen);
    if( datalen != totalwritten )
    {
	AVI_errno = AVI_ERR_WRITE;
    }
#endif

    return totalwritten;
}
