/*
   Copyright (C) 2003 Commonwealth Scientific and Industrial Research
   Organisation (CSIRO) Australia

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

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

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

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

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

#include <config.h>
#include <stdio.h>
#include <time.h>
#include <string.h>
#include <windows.h>
#include <yvals.h>
#include <errno.h>
#include <stdlib.h>
#define anx_malloc malloc
#define anx_free free 
#define PALBPP 144000 /*PAL bytes per packet*/
#define NTSCBPP 120000 /*ntsc bytes per packet
/*#define DEBUG*/
#define CHECKPAL /* define if checking for PAL or NTFSC*/
#define MIN(a,b) ((a)<(b)?(a):(b))

#include <annodex/anx_import.h>
#include <annodex/annodex.h>


typedef struct _AnxCBRData AnxCBRData;
struct _AnxCBRData {
  FILE * cbrfile;
  long total_remaining;
  long bytesperpacket; /*frame size*/
};

static AnxImporter anxcbr_importer;

static unsigned int
le_int(unsigned int i)
{
   unsigned int ret=i;
#ifdef WORDS_BIGENDIAN
   ret =  i>>24;
   ret += (i>>8)&0x0000ff00;
   ret += (i<<8)&0x00ff0000;
   ret += (i<<24);
#endif
   return ret;
}

static unsigned short
le_short(unsigned short s)
{
   unsigned short ret=s;
#ifdef WORDS_BIGENDIAN
   ret =  s>>8;
   ret += s<<8;
#endif
   return ret;
}


static AnxSource *
anxcbr_open (const char * path, const char * id, int ignore_media,
	    double start_time, double end_time,
	    AnxImportCallbacks * unused)
{
  AnxSource * m;
  AnxSourceTrack * track;
  AnxCBRData * cbrd;
  char data[80];
  BOOL sof;
  int num_sofs = 0;
  int  blk_count = 0;
  int blk_diff=0;
  int sof_blknum[2];
  enum {UNKNOWN=0, PAL, NTSC}; 
  int signal_type = UNKNOWN;
  if (ignore_media) return NULL;
  m = (AnxSource *) anx_malloc (sizeof (AnxSource));
  if(m==NULL)
	  printf("not enough memory");
  track = (AnxSourceTrack *) anx_malloc (sizeof (AnxSourceTrack));
  if(track==NULL)
	  printf("not enough memory");
  m->importer = &anxcbr_importer;
  m->current_track = track;
  m->tracks = anx_list_append (NULL, track);
  m->eos = 0;
  m->start_time = start_time;
  m->end_time = end_time;
  m->current_time = start_time;
  cbrd = anx_malloc (sizeof (AnxCBRData));
  if(cbrd==NULL)
	printf("not enough memory");
  cbrd->cbrfile=NULL;
  m->custom_data = cbrd;
  cbrd->cbrfile = fopen(path,"rb");	
  if(cbrd->cbrfile == NULL)
  {
	  printf("/ncbrd file is null - %s/n",strerror(errno));
	  return NULL;
	
  }
#ifdef CHECKPAL
 while(signal_type == UNKNOWN)
  {
		 //count blocks between 2 successive start-of-frames
		while( num_sofs <2)
		{
			//read(file, data, sizeof(data));
			fread(data,sizeof(data),1,cbrd->cbrfile);
			//printf("\ndata is - %d\n", data);
			sof = ((data[0] == 0x1f) && (data[1]==0x07));
			if(sof)
			{
			sof_blknum[num_sofs] = blk_count;
			num_sofs++;
			}
			blk_count++;
		}
		
		blk_diff = sof_blknum[1]- sof_blknum[0];
		switch(blk_diff)
		{
		case (12*150):
			signal_type = PAL;
			 cbrd->bytesperpacket = PALBPP;
			break;
		case (10*150):
			signal_type = NTSC;
			cbrd->bytesperpacket=NTSCBPP;
			break;
		default:
			num_sofs = 0; // try again
			break;
		}
  }
fseek(cbrd->cbrfile,0,0); //rewind the file can also use rewind();
#endif

#ifndef CHECKPAL
  cbrd->bytesperpacket = PALBPP; //PAL is 144000 bpp
#endif
  track->id = (char *)id; 
  track->content_type = "video/x-dv";

  track->granule_rate_n = 1000000;
  track->granule_rate_d = 40;

  track->current_granule = 0;
  track->eos = 0;

  track->end_granule = 0;

  if (start_time != 0.0) {
    // forward to time offset in input DV file start_timex40 miliseconds
    track->start_granule = start_time * 0.0004;

    track->current_granule = fseek(cbrd->cbrfile,track->start_granule,SEEK_SET);
//track->current_granule = lseek(cbrd->cbrfile,0,SEEK_SET);
	//sf_seek(cbrd->cbrfile, track->start_granule, SEEK_SET);
    // detect end of file and set eos accordingly
    if (track->current_granule >= track->end_granule) 
		track->eos = 1;
    else 
		track->eos = 0;

  } else {
	// no fast forward necessary
    track->start_granule = 0;
	//track->current_granule = _lseek(cbrd->cbrfile,0.0,SEEK_SET);
  }

#ifdef DEBUG
  fprintf (stderr, "anxcbr_open: %lld - %lld\n", track->start_granule,
	   track->end_granule);
#endif

  // number of head packets in DV = 0
  track->nr_header_packets = 0;

  return m;

}

static long
anxcbr_read (AnxSource * media, char * buf, long n, long bound)
{
  AnxCBRData * cbrd = (AnxCBRData *)media->custom_data;
  AnxSourceTrack * track = media->current_track;
  long header_n = 0;
  if(cbrd->cbrfile==NULL)
	  printf("File is null in read");
  
  fread(buf,n,1,cbrd->cbrfile); /*read the file*/
  
  if(feof(cbrd->cbrfile)) /*check for end of file - use feof() cause its binary mode*/
  {
	n=-1;
  }
  return n;
}

static long
anxcbr_sizeof_next_read (AnxSource * media, long bound)
{
	AnxCBRData * cbrd = (AnxCBRData *)media->custom_data;
	return cbrd->bytesperpacket;
}

static int
anxcbr_close (AnxSource * media)
{
  AnxCBRData *  cbrd = (AnxCBRData *)media->custom_data;

  fclose(cbrd->cbrfile);

  anx_free (cbrd); // not sure if you need this
  anx_free (media);

  return 0;
}

static struct _AnxImporter anxcbr_importer_dv = {
  (AnxImporterOpenFunc)anxcbr_open,
  (AnxImporterOpenFDFunc)NULL,
  (AnxImporterCloseFunc)anxcbr_close,
  (AnxImporterReadFunc)anxcbr_read,
  (AnxImporterSizeofNextReadFunc)anxcbr_sizeof_next_read,
  "video/x-dv"
};

AnxImporter *
anx_importer_init (int i)
{
  switch (i) {
  case 0:
    return &anxcbr_importer_dv;
    break;
  default:
    return NULL;
    break;
  }
}