/*
    Real parser & demuxer
    
    (C) Alex Beregszaszi
    
    Based on FFmpeg's libav/rm.c.

Audio codecs: (supported by RealPlayer8 for Linux)
    DNET - RealAudio 3.0, really it's AC3 in swapped-byteorder
    SIPR - SiproLab's audio codec, ACELP decoder working with MPlayer,
	   needs fine-tuning too :)
    ATRC - RealAudio 8 (ATRAC3) - www.minidisc.org/atrac3_article.pdf,
           ACM decoder uploaded, needs some fine-tuning to work
	   -> RealAudio 8
    COOK/COKR - Real Cooker -> RealAudio G2

Video codecs: (supported by RealPlayer8 for Linux)
    RV10 - H.263 based, working with libavcodec's decoder
    RV20-RV40 - using RealPlayer's codec plugins
*/

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

#include "config.h"
#include "mp_msg.h"
#include "help_mp.h"

#include "stream.h"
#include "demuxer.h"
#include "stheader.h"
#include "bswap.h"

//#define mp_dbg(mod,lev, args... ) mp_msg_c((mod<<8)|lev, ## args )

#define MKTAG(a, b, c, d) (a | (b << 8) | (c << 16) | (d << 24))

#define MAX_STREAMS 32

typedef struct {
    int		timestamp;
    int		offset;
    int		packetno;
    int		len; /* only filled by our index generator */
    int		flags; /* only filled by our index generator */
} real_index_table_t;

typedef struct {
    /* for seeking */
    int		index_chunk_offset;
    real_index_table_t *index_table[MAX_STREAMS];
//    int		*index_table[MAX_STREAMS];
    int		index_table_size[MAX_STREAMS];
    int		data_chunk_offset;
    int		num_of_packets;
    int		current_packet;

    int		current_apacket;
    int		current_vpacket;
    
    // timestamp correction:
    int		kf_base;// timestamp of the prev. video keyframe
    int		kf_pts;	// timestamp of next video keyframe
    int		a_pts;	// previous audio timestamp
    float	v_pts;  // previous video timestamp
    
    /* stream id table */
//    int		last_a_stream;
//    int 	a_streams[MAX_STREAMS];
//    int		last_v_stream;
//    int 	v_streams[MAX_STREAMS];
} real_priv_t;

/* originally from FFmpeg */
static void get_str(int isbyte, demuxer_t *demuxer, char *buf, int buf_size)
{
    int len;
    
    if (isbyte)
	len = stream_read_char(demuxer->stream);
    else
	len = stream_read_word(demuxer->stream);

    stream_read(demuxer->stream, buf, (len > buf_size) ? buf_size : len);
    if (len > buf_size)
	stream_skip(demuxer->stream, len-buf_size);

    printf("read_str: %d bytes read\n", len);
}

static void skip_str(int isbyte, demuxer_t *demuxer)
{
    int len;

    if (isbyte)
	len = stream_read_char(demuxer->stream);
    else
	len = stream_read_word(demuxer->stream);

    stream_skip(demuxer->stream, len);    

    printf("skip_str: %d bytes skipped\n", len);
}

static void dump_index(demuxer_t *demuxer, int stream_id)
{
    real_priv_t *priv = demuxer->priv;
    real_index_table_t *index;
    int i, entries;

    if (verbose<=0)
	return;
    
    if (stream_id > MAX_STREAMS)
	return;

    index = priv->index_table[stream_id];
    entries = priv->index_table_size[stream_id];
    
    printf("Index table for stream %d\n", stream_id);
    for (i = 0; i < entries; i++)
    {
	printf("packetno: %x pos: %x len: %x timestamp: %x flags: %x\n",
	    index[i].packetno, index[i].offset, index[i].len, index[i].timestamp,
	    index[i].flags);
    }
}

static int parse_index_chunk(demuxer_t *demuxer)
{
    real_priv_t *priv = demuxer->priv;
    int origpos = stream_tell(demuxer->stream);
    int next_header_pos = priv->index_chunk_offset;
    int i, entries, stream_id;

read_index:
    stream_seek(demuxer->stream, next_header_pos);

    i = stream_read_dword_le(demuxer->stream);
    if ((i == -256) || (i != MKTAG('I', 'N', 'D', 'X')))
    {
	printf("Something went wrong, no index chunk found on given address (%d)\n",
	    next_header_pos);
	goto end;
    }

    printf("Reading index table from index chunk (%d)\n",
	next_header_pos);

    i = stream_read_dword(demuxer->stream);
    printf("size: %d bytes\n", i);

    i = stream_read_word(demuxer->stream);
    if (i != 0)
	printf("Hmm, index table with unknown version (%d), please report it to MPlayer developers!\n", i);

    entries = stream_read_dword(demuxer->stream);
    printf("entries: %d\n", entries);
    
    stream_id = stream_read_word(demuxer->stream);
    printf("stream_id: %d\n", stream_id);
    
    next_header_pos = stream_read_dword(demuxer->stream);
    printf("next_header_pos: %d\n", next_header_pos);
    if (entries <= 0)
    {
	if (next_header_pos)
	    goto read_index;
	i = entries;
	goto end;
    }

    priv->index_table_size[stream_id] = entries;
    priv->index_table[stream_id] = malloc(priv->index_table_size[stream_id] * sizeof(real_index_table_t));
    
    for (i = 0; i < entries; i++)
    {
	stream_skip(demuxer->stream, 2); /* version */
	priv->index_table[stream_id][i].timestamp = stream_read_dword(demuxer->stream);
	priv->index_table[stream_id][i].offset = stream_read_dword(demuxer->stream);
	priv->index_table[stream_id][i].packetno = stream_read_dword(demuxer->stream);
//	printf("Index table: Stream#%d: entry: %d: pos: %d\n",
//	    stream_id, i, priv->index_table[stream_id][i].offset);
    }
    
    dump_index(demuxer, stream_id);

    if (next_header_pos > 0)
	goto read_index;

end:
    demuxer->seekable = 1; /* got index, we're able to seek */
    if (i == -256)
	stream_reset(demuxer->stream);
    stream_seek(demuxer->stream, origpos);
    if (i == -256)
	return 0;
    else
	return 1;
}

static int generate_index(demuxer_t *demuxer)
{
    real_priv_t *priv = demuxer->priv;
    int origpos = stream_tell(demuxer->stream);
    int data_pos = priv->data_chunk_offset-10;
    int num_of_packets = 0;
    int i, entries = 0;
    int len, stream_id = 0, timestamp, flags;
    int tab_pos = 0;

read_index:
    stream_seek(demuxer->stream, data_pos);

    i = stream_read_dword_le(demuxer->stream);
    if ((i == -256) || (i != MKTAG('D', 'A', 'T', 'A')))
    {
	printf("Something went wrong, no data chunk found on given address (%d)\n",
	    data_pos);
	goto end;
    }
    stream_skip(demuxer->stream, 4); /* chunk size */
    stream_skip(demuxer->stream, 2); /* version */
    
    num_of_packets = stream_read_dword(demuxer->stream);
    printf("Generating index table from raw data (pos: 0x%x) for %d packets\n",
	data_pos, num_of_packets);

    data_pos = stream_read_dword_le(demuxer->stream)-10; /* next data chunk */

    for (i = 0; i < MAX_STREAMS; i++)
    {
    priv->index_table_size[i] = num_of_packets;
    priv->index_table[i] = malloc(priv->index_table_size[i] * sizeof(real_index_table_t));
//    priv->index_table[stream_id] = realloc(priv->index_table[stream_id],
//	priv->index_table_size[stream_id] * sizeof(real_index_table_t));
    }

    tab_pos = 0;
    
//    memset(priv->index_table_size, 0, sizeof(int)*MAX_STREAMS);
//    memset(priv->index_table, 0, sizeof(real_index_table_t)*MAX_STREAMS);
    
    while (tab_pos < num_of_packets)
    {
    i = stream_read_char(demuxer->stream);
    if (i == -256)
	goto end;
    stream_skip(demuxer->stream, 1);
//    stream_skip(demuxer->stream, 2); /* version */

    len = stream_read_word(demuxer->stream);
    stream_id = stream_read_word(demuxer->stream);
    timestamp = stream_read_dword(demuxer->stream);
    
    stream_skip(demuxer->stream, 1); /* reserved */
    flags = stream_read_char(demuxer->stream);

    i = tab_pos;

//    priv->index_table_size[stream_id] = i;
//    if (priv->index_table[stream_id] == NULL)
//	priv->index_table[stream_id] = malloc(priv->index_table_size[stream_id] * sizeof(real_index_table_t));
//    else
//	priv->index_table[stream_id] = realloc(priv->index_table[stream_id],
//	    priv->index_table_size[stream_id] * sizeof(real_index_table_t));
    
    priv->index_table[stream_id][i].timestamp = timestamp;
    priv->index_table[stream_id][i].offset = stream_tell(demuxer->stream)-12;
    priv->index_table[stream_id][i].len = len;
    priv->index_table[stream_id][i].packetno = entries;
    priv->index_table[stream_id][i].flags = flags;

    tab_pos++;

    /* skip data */
    stream_skip(demuxer->stream, len-12);
    }
    dump_index(demuxer, stream_id);
    if (data_pos)
	goto read_index;

end:
    demuxer->seekable = 1; /* got index, we're able to seek */
    if (i == -256)
	stream_reset(demuxer->stream);
    stream_seek(demuxer->stream, origpos);
    if (i == -256)
	return 0;
    else
	return 1;
}

int real_check_file(demuxer_t* demuxer)
{
    real_priv_t *priv;
    int c;

    mp_msg(MSGT_DEMUX,MSGL_V,"Checking for REAL\n");
    
    c = stream_read_dword_le(demuxer->stream);
    if (c == -256)
	return 0; /* EOF */
    if (c != MKTAG('.', 'R', 'M', 'F'))
	return 0; /* bad magic */

    priv = malloc(sizeof(real_priv_t));
    memset(priv, 0, sizeof(real_priv_t));
    demuxer->priv = priv;

    return 1;
}

void hexdump(char *, unsigned long);

#define SKIP_BITS(n) buffer<<=n
#define SHOW_BITS(n) ((buffer)>>(32-(n)))

static float real_fix_timestamp(real_priv_t* priv, unsigned char* s, int timestamp, float frametime, unsigned int format){
  float v_pts;
  uint32_t buffer= (s[0]<<24) + (s[1]<<16) + (s[2]<<8) + s[3];
  int kf=timestamp;
  int pict_type;
  int orig_kf;

#if 1
  if(format==mmioFOURCC('R','V','3','0') || format==mmioFOURCC('R','V','4','0')){
    if(format==mmioFOURCC('R','V','3','0')){
      SKIP_BITS(3);
      pict_type= SHOW_BITS(2);
      SKIP_BITS(2 + 7);
    }else{
      SKIP_BITS(1);
      pict_type= SHOW_BITS(2);
      SKIP_BITS(2 + 7 + 3);
    }
    orig_kf=
    kf= SHOW_BITS(13);  //    kf= 2*SHOW_BITS(12);
//    if(pict_type==0)
    if(pict_type<=1){
      // I frame, sync timestamps:
      priv->kf_base=timestamp-kf;
      if(verbose>1) printf("\nTS: base=%08X\n",priv->kf_base);
      kf=timestamp;
    } else {
      // P/B frame, merge timestamps:
      int tmp=timestamp-priv->kf_base;
      kf|=tmp&(~0x1fff);	// combine with packet timestamp
      if(kf<tmp-4096) kf+=8192; else // workaround wrap-around problems
      if(kf>tmp+4096) kf-=8192;
      kf+=priv->kf_base;
    }
    if(pict_type != 3){ // P || I  frame -> swap timestamps
	int tmp=kf;
	kf=priv->kf_pts;
	priv->kf_pts=tmp;
//	if(kf<=tmp) kf=0;
    }
    if(verbose>1) printf("\nTS: %08X -> %08X (%04X) %d %02X %02X %02X %02X %5d\n",timestamp,kf,orig_kf,pict_type,s[0],s[1],s[2],s[3],kf-(int)(1000.0*priv->v_pts));
  }
#endif
    v_pts=kf*0.001f;
//    if(v_pts<priv->v_pts || !kf) v_pts=priv->v_pts+frametime;
    priv->v_pts=v_pts;
    return v_pts;
}

typedef struct dp_hdr_s {
    uint32_t chunks;	// number of chunks
    uint32_t timestamp; // timestamp from packet header
    uint32_t len;	// length of actual data
    uint32_t chunktab;	// offset to chunk offset array
} dp_hdr_t;

// return value:
//     0 = EOF or no stream found
//     1 = successfully read a packet
int demux_real_fill_buffer(demuxer_t *demuxer)
{
    real_priv_t *priv = demuxer->priv;
    demux_stream_t *ds = NULL;
    int len;
    int timestamp;
    int stream_id;
#ifdef CRACK_MATRIX
    int i;
#endif
    int flags;
    int version;
    int reserved;

  while(1){

    demuxer->filepos = stream_tell(demuxer->stream);
    version = stream_read_word(demuxer->stream); /* version */
    len = stream_read_word(demuxer->stream);
    if ((version==0x4441) && (len==0x5441)) { // new data chunk
	mp_msg(MSGT_DEMUX,MSGL_INFO,"demux_real: New data chunk is coming!!!\n");
	stream_skip(demuxer->stream,14); 
	demuxer->filepos = stream_tell(demuxer->stream);
        version = stream_read_word(demuxer->stream); /* version */
	len = stream_read_word(demuxer->stream);	
    }

    
    if (len == -256){ /* EOF */
//	printf("len==-256!\n");
	return 0;
    }
    if (len < 12){
	printf("%08X: packet v%d len=%d  \n",(int)demuxer->filepos,(int)version,(int)len);
	printf("bad packet len (%d)\n", len);
	stream_skip(demuxer->stream, len);
	continue; //goto loop;
    }

    stream_id = stream_read_word(demuxer->stream);
    timestamp = stream_read_dword(demuxer->stream);
    reserved = stream_read_char(demuxer->stream);
    flags = stream_read_char(demuxer->stream);
    /* flags:		*/
    /*  0x1 - reliable  */
    /* 	0x2 - keyframe	*/

//    printf("%08X: packet v%d len=%4d  id=%d  pts=%6d  rvd=%d  flags=%d  \n",
//	(int)demuxer->filepos,(int)version,(int)len, stream_id,
//	(int) timestamp, reserved, flags);

    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "len:%d\n", len);
    mp_dbg(MSGT_DEMUX,MSGL_V,  "\npacket#%d: pos: 0x%0x, len: %d, id: %d, pts: %d, flags: %x rvd:%d\n",
	priv->current_packet, (int)demuxer->filepos, len, stream_id, timestamp, flags, reserved);

    priv->current_packet++;
    len -= 12;    

//    printf("s_id=%d  aid=%d  vid=%d  \n",stream_id,demuxer->audio->id,demuxer->video->id);

    /* check stream_id: */

    if(demuxer->audio->id==stream_id){
got_audio:
	ds=demuxer->audio;
	mp_dbg(MSGT_DEMUX,MSGL_DBG2, "packet is audio (id: %d)\n", stream_id);

	// parse audio chunk:
	{
#ifdef CRACK_MATRIX
	    int spos=stream_tell(demuxer->stream);
	    static int cnt=0;
	    static int cnt2=CRACK_MATRIX;
#endif
            demux_packet_t *dp = new_demux_packet(len);
	    stream_read(demuxer->stream, dp->buffer, len);
#ifdef CRACK_MATRIX
	    printf("*** audio block len=%d\n",len);
	    { // HACK - used for reverse engineering the descrambling matrix
		FILE* f=fopen("test.rm","r+");
		fseek(f,spos,SEEK_SET);
		++cnt;
//		    for(i=0;i<len;i++) dp->buffer[i]=i/0x12;
//		    for(i=0;i<len;i++) dp->buffer[i]=i;
//		    for(i=0;i<len;i++) dp->buffer[i]=cnt;
//		    for(i=0;i<len;i++) dp->buffer[i]=cnt<<4;
		    for(i=0;i<len;i++) dp->buffer[i]=(i==cnt2) ? (cnt+16*(8+cnt)) : 0;
		if(cnt==6){ cnt=0; ++cnt2; }
		fwrite(dp->buffer, len, 1, f);
		fclose(f);
		if(cnt2>0x150) *((int*)NULL)=1; // sig11 :)
	    }
#endif
#if 0
	    if( ((sh_audio_t *)ds->sh)->format == 0x2000) {
		// if DNET, swap bytes, as DNET is byte-swapped AC3:
		char *ptr = dp->buffer;
		int i;
		for (i = 0; i < len; i += 2)
		{
		    const char tmp = ptr[0];
		    ptr[0] = ptr[1];
		    ptr[1] = tmp;
		    ptr += 2;
		}
	    }
#endif
	    dp->pts = (priv->a_pts==timestamp) ? 0 : (timestamp/1000.0f);
	    priv->a_pts=timestamp;
	    dp->pos = demuxer->filepos;
	    dp->flags = (flags & 0x2) ? 0x10 : 0;
	    ds_add_packet(ds, dp);
	}
	
	return 1;
    }
    
    if(demuxer->video->id==stream_id){
got_video:
	ds=demuxer->video;
	mp_dbg(MSGT_DEMUX,MSGL_DBG2, "packet is video (id: %d)\n", stream_id);
	
	// parse video chunk:
	{
	    // we need a more complicated, 2nd level demuxing, as the video
	    // frames are stored fragmented in the video chunks :(
	    sh_video_t *sh_video = ds->sh;
	    demux_packet_t *dp;
	    int vpkg_header, vpkg_length, vpkg_offset;
	    int vpkg_seqnum=-1;
	    int vpkg_subseq=0;

	    while(len>2){
		dp_hdr_t* dp_hdr;
		unsigned char* dp_data;
		uint32_t* extra;

//		printf("xxx len=%d  \n",len);

		// read packet header
		// bit 7: 1=last block in block chain
		// bit 6: 1=short header (only one block?)
		vpkg_header=stream_read_char(demuxer->stream); --len;
		mp_dbg(MSGT_DEMUX,MSGL_DBG2, "hdr: %0.2X (len=%d) ",vpkg_header,len);

		if (0x40==(vpkg_header&0xc0)) {
		    // seems to be a very short header
	    	    // 2 bytes, purpose of the second byte yet unknown
	    	    int bummer;
		    bummer=stream_read_char(demuxer->stream); --len;
 		    mp_dbg(MSGT_DEMUX,MSGL_DBG2,  "%0.2X",bummer);
 	    	    vpkg_offset=0;
 		    vpkg_length=len;
		} else {
		
		    if (0==(vpkg_header&0x40)) {
			// sub-seqnum (bits 0-6: number of fragment. bit 7: ???)
		        vpkg_subseq=stream_read_char(demuxer->stream);
	                --len;
		        mp_dbg(MSGT_DEMUX,MSGL_DBG2,  "subseq: %0.2X ",vpkg_subseq);
			vpkg_subseq&=0x7f;
	            }

	  	    // size of the complete packet
		    // bit 14 is always one (same applies to the offset)
		    vpkg_length=stream_read_word(demuxer->stream);
		    len-=2;
		    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "l: %0.2X %0.2X ",vpkg_length>>8,vpkg_length&0xff);
		    if (!(vpkg_length&0xC000)) {
			vpkg_length<<=16;
		        vpkg_length|=stream_read_word(demuxer->stream);
		        mp_dbg(MSGT_DEMUX,MSGL_DBG2, "l+: %0.2X %0.2X ",(vpkg_length>>8)&0xff,vpkg_length&0xff);
	    	        len-=2;
		    } else
		    vpkg_length&=0x3fff;

		    // offset of the following data inside the complete packet
		    // Note: if (hdr&0xC0)==0x80 then offset is relative to the
		    // _end_ of the packet, so it's equal to fragment size!!!
		    vpkg_offset=stream_read_word(demuxer->stream);
	            len-=2;
		    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "o: %0.2X %0.2X ",vpkg_offset>>8,vpkg_offset&0xff);
		    if (!(vpkg_offset&0xC000)) {
			vpkg_offset<<=16;
		        vpkg_offset|=stream_read_word(demuxer->stream);
		        mp_dbg(MSGT_DEMUX,MSGL_DBG2, "o+: %0.2X %0.2X ",(vpkg_offset>>8)&0xff,vpkg_offset&0xff);
	    	        len-=2;
		    } else
		    vpkg_offset&=0x3fff;

		    vpkg_seqnum=stream_read_char(demuxer->stream); --len;
		    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "seq: %0.2X ",vpkg_seqnum);
	        }
 		mp_dbg(MSGT_DEMUX,MSGL_DBG2, "\n");
                mp_dbg(MSGT_DEMUX,MSGL_DBG2, "blklen=%d\n", len);
		mp_msg(MSGT_DEMUX,MSGL_DBG2, "block: hdr=0x%0x, len=%d, offset=%d, seqnum=%d\n",
		    vpkg_header, vpkg_length, vpkg_offset, vpkg_seqnum);

		if(ds->asf_packet){
		    dp=ds->asf_packet;
		    dp_hdr=(dp_hdr_t*)dp->buffer;
		    dp_data=dp->buffer+sizeof(dp_hdr_t);
		    extra=(uint32_t*)(dp->buffer+dp_hdr->chunktab);
		    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "we have an incomplete packet (oldseq=%d new=%d)\n",ds->asf_seq,vpkg_seqnum);
		    // we have an incomplete packet:
		    if(ds->asf_seq!=vpkg_seqnum){
			// this fragment is for new packet, close the old one
			mp_msg(MSGT_DEMUX,MSGL_DBG2, "closing probably incomplete packet, len: %d  \n",dp->len);
			dp->pts=(dp_hdr->len<3)?0:
			    real_fix_timestamp(priv,dp_data,dp_hdr->timestamp,sh_video->frametime,sh_video->format);
			ds_add_packet(ds,dp);
			ds->asf_packet=NULL;
		    } else {
			// append data to it!
			++dp_hdr->chunks;
			mp_msg(MSGT_DEMUX,MSGL_DBG2,"[chunks=%d  subseq=%d]\n",dp_hdr->chunks,vpkg_subseq);
			if(dp_hdr->chunktab+8*(1+dp_hdr->chunks)>dp->len){
			    // increase buffer size, this should not happen!
			    mp_msg(MSGT_DEMUX,MSGL_WARN, "chunktab buffer too small!!!!!\n");
			    dp->len=dp_hdr->chunktab+8*(4+dp_hdr->chunks);
			    dp->buffer=realloc(dp->buffer,dp->len);
			    // re-calc pointers:
			    dp_hdr=(dp_hdr_t*)dp->buffer;
			    dp_data=dp->buffer+sizeof(dp_hdr_t);
			    extra=(uint32_t*)(dp->buffer+dp_hdr->chunktab);
			}
			extra[2*dp_hdr->chunks+0]=1;
			extra[2*dp_hdr->chunks+1]=dp_hdr->len;
			if(0x80==(vpkg_header&0xc0)){
			    // last fragment!
			    if(dp_hdr->len!=vpkg_length-vpkg_offset)
				mp_msg(MSGT_DEMUX,MSGL_V,"warning! assembled.len=%d  frag.len=%d  total.len=%d  \n",dp->len,vpkg_offset,vpkg_length-vpkg_offset);
            		    stream_read(demuxer->stream, dp_data+dp_hdr->len, vpkg_offset);
			    if((dp_data[dp_hdr->len]&0x20) && (sh_video->format==0x30335652)) --dp_hdr->chunks; else
			    dp_hdr->len+=vpkg_offset;
			    len-=vpkg_offset;
 			    mp_dbg(MSGT_DEMUX,MSGL_DBG2, "fragment (%d bytes) appended, %d bytes left\n",vpkg_offset,len);
			    // we know that this is the last fragment -> we can close the packet!
			    dp->pts=(dp_hdr->len<3)?0:
				real_fix_timestamp(priv,dp_data,dp_hdr->timestamp,sh_video->frametime,sh_video->format);
			    ds_add_packet(ds,dp);
			    ds->asf_packet=NULL;
			    // continue parsing
			    continue;
			}
			// non-last fragment:
			if(dp_hdr->len!=vpkg_offset)
			    mp_msg(MSGT_DEMUX,MSGL_V,"warning! assembled.len=%d  offset=%d  frag.len=%d  total.len=%d  \n",dp->len,vpkg_offset,len,vpkg_length);
            		stream_read(demuxer->stream, dp_data+dp_hdr->len, len);
			if((dp_data[dp_hdr->len]&0x20) && (sh_video->format==0x30335652)) --dp_hdr->chunks; else
			dp_hdr->len+=len;
			len=0;
			break; // no more fragments in this chunk!
		    }
		}
		// create new packet!
		dp = new_demux_packet(sizeof(dp_hdr_t)+vpkg_length+8*(1+2*(vpkg_header&0x3F)));
	    	// the timestamp seems to be in milliseconds
		dp->pts = 0; // timestamp/1000.0f; //timestamp=0;
                dp->pos = demuxer->filepos;
                dp->flags = (flags & 0x2) ? 0x10 : 0;
		ds->asf_seq = vpkg_seqnum;
		dp_hdr=(dp_hdr_t*)dp->buffer;
		dp_hdr->chunks=0;
		dp_hdr->timestamp=timestamp;
		dp_hdr->chunktab=sizeof(dp_hdr_t)+vpkg_length;
		dp_data=dp->buffer+sizeof(dp_hdr_t);
		extra=(uint32_t*)(dp->buffer+dp_hdr->chunktab);
		extra[0]=1; extra[1]=0; // offset of the first chunk
		if(0x00==(vpkg_header&0xc0)){
		    // first fragment:
		    dp_hdr->len=len;
		    stream_read(demuxer->stream, dp_data, len);
		    ds->asf_packet=dp;
		    len=0;
		    break;
		}
		// whole packet (not fragmented):
		dp_hdr->len=vpkg_length; len-=vpkg_length;
		stream_read(demuxer->stream, dp_data, vpkg_length);
		dp->pts=(dp_hdr->len<3)?0:
		    real_fix_timestamp(priv,dp_data,dp_hdr->timestamp,sh_video->frametime,sh_video->format);
		ds_add_packet(ds,dp);

	    } // while(len>0)
	    
	    if(len){
		printf("\n******** !!!!!!!! BUG!! len=%d !!!!!!!!!!! ********\n",len);
		if(len>0) stream_skip(demuxer->stream, len);
	    }
	}

	return 1;
    }

if(stream_id<256){

    if(demuxer->audio->id==-1 && demuxer->a_streams[stream_id]){
	sh_audio_t *sh = demuxer->a_streams[stream_id];
	demuxer->audio->id=stream_id;
	sh->ds=demuxer->audio;
	demuxer->audio->sh=sh;
        mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected RM audio ID = %d\n",stream_id);
	goto got_audio;
    }

    if(demuxer->video->id==-1 && demuxer->v_streams[stream_id]){
	sh_video_t *sh = demuxer->v_streams[stream_id];
	demuxer->video->id=stream_id;
	sh->ds=demuxer->video;
	demuxer->video->sh=sh;
        mp_msg(MSGT_DEMUX,MSGL_V,"Auto-selected RM video ID = %d\n",stream_id);
	goto got_video;
    }

}

    mp_msg(MSGT_DEMUX,MSGL_DBG2, "unknown stream id (%d)\n", stream_id);
    stream_skip(demuxer->stream, len);
  }//    goto loop;
}

extern void print_wave_header(WAVEFORMATEX *h);

void demux_open_real(demuxer_t* demuxer)
{
    real_priv_t* priv = demuxer->priv;
    int num_of_headers;
    int a_streams=0;
    int v_streams=0;
    int i;

    stream_skip(demuxer->stream, 4); /* header size */
    stream_skip(demuxer->stream, 2); /* version */
//    stream_skip(demuxer->stream, 4);
    i = stream_read_dword(demuxer->stream);
    mp_msg(MSGT_DEMUX,MSGL_V, "real: File version: %d\n", i);
    num_of_headers = stream_read_dword(demuxer->stream);
//    stream_skip(demuxer->stream, 4); /* number of headers */

    /* parse chunks */
    for (i = 1; i <= num_of_headers; i++)
//    for (i = 1; ; i++)
    {
	int chunk_id, chunk_pos, chunk_size;
	
	chunk_pos = stream_tell(demuxer->stream);
	chunk_id = stream_read_dword_le(demuxer->stream);
	chunk_size = stream_read_dword(demuxer->stream);

	stream_skip(demuxer->stream, 2); /* version */

	mp_msg(MSGT_DEMUX,MSGL_V, "Chunk: %.4s (%x) (size: 0x%x, offset: 0x%x)\n",
	    (char *)&chunk_id, chunk_id, chunk_size, chunk_pos);
	
	if (chunk_size < 10){
	    mp_msg(MSGT_DEMUX,MSGL_ERR,"demux_real: invalid chunksize! (%d)\n",chunk_size);
	    break; //return;
	}
	
	switch(chunk_id)
	{
	    case MKTAG('P', 'R', 'O', 'P'):
		/* Properties header */

		stream_skip(demuxer->stream, 4); /* max bitrate */
		stream_skip(demuxer->stream, 4); /* avg bitrate */
		stream_skip(demuxer->stream, 4); /* max packet size */
		stream_skip(demuxer->stream, 4); /* avg packet size */
		stream_skip(demuxer->stream, 4); /* nb packets */
		stream_skip(demuxer->stream, 4); /* duration */
		stream_skip(demuxer->stream, 4); /* preroll */
		priv->index_chunk_offset = stream_read_dword(demuxer->stream);
		mp_msg(MSGT_DEMUX,MSGL_V,"First index chunk offset: 0x%x\n", priv->index_chunk_offset);
		priv->data_chunk_offset = stream_read_dword(demuxer->stream)+10;
		mp_msg(MSGT_DEMUX,MSGL_V,"First data chunk offset: 0x%x\n", priv->data_chunk_offset);
		stream_skip(demuxer->stream, 2); /* nb streams */
#if 0
		stream_skip(demuxer->stream, 2); /* flags */
#else
		{
		    int flags = stream_read_word(demuxer->stream);
		    
		    if (flags)
		    {
		    mp_msg(MSGT_DEMUX,MSGL_V,"Flags (%x): ", flags);
		    if (flags & 0x1)
			mp_msg(MSGT_DEMUX,MSGL_V,"[save allowed] ");
		    if (flags & 0x2)
			mp_msg(MSGT_DEMUX,MSGL_V,"[perfect play (more buffers)] ");
		    if (flags & 0x4)
			mp_msg(MSGT_DEMUX,MSGL_V,"[live broadcast] ");
		    mp_msg(MSGT_DEMUX,MSGL_V,"\n");
		    }
		}
#endif
		break;
	    case MKTAG('C', 'O', 'N', 'T'):
	    {
		/* Content description header */
		char *buf;
		int len;

		len = stream_read_word(demuxer->stream);
		if (len > 0)
		{
		    buf = malloc(len+1);
		    stream_read(demuxer->stream, buf, len);
		    buf[len] = 0;
		    demux_info_add(demuxer, "name", buf);
		    free(buf);
		}

		len = stream_read_word(demuxer->stream);
		if (len > 0)
		{
		    buf = malloc(len+1);
		    stream_read(demuxer->stream, buf, len);
		    buf[len] = 0;
		    demux_info_add(demuxer, "author", buf);
		    free(buf);
		}

		len = stream_read_word(demuxer->stream);
		if (len > 0)
		{
		    buf = malloc(len+1);
		    stream_read(demuxer->stream, buf, len);
		    buf[len] = 0;
		    demux_info_add(demuxer, "copyright", buf);
		    free(buf);
		}

		len = stream_read_word(demuxer->stream);
		if (len > 0)
		{
		    buf = malloc(len+1);
	    	    stream_read(demuxer->stream, buf, len);
		    buf[len] = 0;
		    demux_info_add(demuxer, "comment", buf);
		    free(buf);
		}
		break;
	    }
	    case MKTAG('M', 'D', 'P', 'R'):
	    {
		/* Media properties header */
		int stream_id;
		int bitrate;
		int codec_data_size;
		int codec_pos;
		int tmp;

		stream_id = stream_read_word(demuxer->stream);
		mp_msg(MSGT_DEMUX,MSGL_V,"Found new stream (id: %d)\n", stream_id);
		
		stream_skip(demuxer->stream, 4); /* max bitrate */
		bitrate = stream_read_dword(demuxer->stream); /* avg bitrate */
		stream_skip(demuxer->stream, 4); /* max packet size */
		stream_skip(demuxer->stream, 4); /* avg packet size */
		stream_skip(demuxer->stream, 4); /* start time */
		stream_skip(demuxer->stream, 4); /* preroll */
		stream_skip(demuxer->stream, 4); /* duration */
		
		skip_str(1, demuxer);	/* stream description (name) */
		skip_str(1, demuxer);	/* mimetype */
		
		/* Type specific header */
		codec_data_size = stream_read_dword(demuxer->stream);
		codec_pos = stream_tell(demuxer->stream);

		tmp = stream_read_dword(demuxer->stream);
		
		mp_msg(MSGT_DEMUX,MSGL_DBG2,"demux_real: type_spec: len=%d  fpos=0x%X  first_dword=0x%X (%.4s)  \n",
		    (int)codec_data_size,(int)codec_pos,tmp,&tmp);

#if 1
		// skip unknown shit - FIXME: find a better/cleaner way!
		{   int len=codec_data_size;
		    while(--len>=8){
			if(tmp==MKTAG(0xfd, 'a', 'r', '.')) break; // audio
			if(tmp==MKTAG('O', 'D', 'I', 'V')) break;  // video
			tmp=(tmp<<8)|stream_read_char(demuxer->stream);
		    }
		}
#endif

#ifdef MP_DEBUG
#define stream_skip(st,siz) { int i; for(i=0;i<siz;i++) mp_msg(MSGT_DEMUX,MSGL_V," %02X",stream_read_char(st)); mp_msg(MSGT_DEMUX,MSGL_V,"\n");}
#endif

		if (tmp == MKTAG(0xfd, 'a', 'r', '.'))
		{
		    /* audio header */
		    sh_audio_t *sh = new_sh_audio(demuxer, stream_id);
		    char buf[128]; /* for codec name */
		    int frame_size;
		    int sub_packet_size;
		    int sub_packet_h;
		    int version;
		    int flavor;
		    int coded_frame_size;
		    int codecdata_length;
		    
		    mp_msg(MSGT_DEMUX,MSGL_V,"Found audio stream!\n");
		    version = stream_read_word(demuxer->stream);
		    mp_msg(MSGT_DEMUX,MSGL_V,"version: %d\n", version);
//		    stream_skip(demuxer->stream, 2); /* version (4 or 5) */
		    stream_skip(demuxer->stream, 2); // 00 00
		    stream_skip(demuxer->stream, 4); /* .ra4 or .ra5 */
		    stream_skip(demuxer->stream, 4); // ???
		    stream_skip(demuxer->stream, 2); /* version (4 or 5) */
		    stream_skip(demuxer->stream, 4); // header size == 0x4E
		    flavor = stream_read_word(demuxer->stream);/* codec flavor id */
		    coded_frame_size = stream_read_dword(demuxer->stream);/* needed by codec */
		    //stream_skip(demuxer->stream, 4); /* coded frame size */
		    stream_skip(demuxer->stream, 4); // big number
		    stream_skip(demuxer->stream, 4); // bigger number
		    stream_skip(demuxer->stream, 4); // 2 || -''-
//		    stream_skip(demuxer->stream, 2); // 0x10
		    sub_packet_h = stream_read_word(demuxer->stream);
//		    stream_skip(demuxer->stream, 2); /* coded frame size */
		    frame_size = stream_read_word(demuxer->stream);
		    mp_msg(MSGT_DEMUX,MSGL_V,"frame_size: %d\n", frame_size);
		    sub_packet_size = stream_read_word(demuxer->stream);
		    mp_msg(MSGT_DEMUX,MSGL_V,"sub_packet_size: %d\n", sub_packet_size);
		    stream_skip(demuxer->stream, 2); // 0
		    
		    if (version == 5)
			stream_skip(demuxer->stream, 6); //0,srate,0

		    sh->samplerate = stream_read_word(demuxer->stream);
		    stream_skip(demuxer->stream, 2);  // 0
		    sh->samplesize = stream_read_word(demuxer->stream)/8;
		    sh->channels = stream_read_word(demuxer->stream);
		    mp_msg(MSGT_DEMUX,MSGL_V,"samplerate: %d, channels: %d\n",
			sh->samplerate, sh->channels);

		    if (version == 5)
		    {
			stream_skip(demuxer->stream, 4);  // "genr"
			stream_read(demuxer->stream, buf, 4); // fourcc
			buf[4] = 0;
		    }
		    else
		    {		
			/* Desc #1 */
			skip_str(1, demuxer);
			/* Desc #2 */
			get_str(1, demuxer, buf, sizeof(buf));
		    }

		    /* Emulate WAVEFORMATEX struct: */
		    sh->wf = malloc(sizeof(WAVEFORMATEX));
		    memset(sh->wf, 0, sizeof(WAVEFORMATEX));
		    sh->wf->nChannels = sh->channels;
		    sh->wf->wBitsPerSample = sh->samplesize*8;
		    sh->wf->nSamplesPerSec = sh->samplerate;
		    sh->wf->nAvgBytesPerSec = bitrate;
		    sh->wf->nBlockAlign = frame_size;
		    sh->wf->cbSize = 0;
		    sh->format = MKTAG(buf[0], buf[1], buf[2], buf[3]);

#if 0
		    switch (sh->format){
			case MKTAG('d', 'n', 'e', 't'):
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: DNET (AC3 with low-bitrate extension)\n");
			    break;
			case MKTAG('s', 'i', 'p', 'r'):
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: SiproLab's ACELP.net\n");
			    break;
			case MKTAG('c', 'o', 'o', 'k'):
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: Real's GeneralCooker (?) (RealAudio G2?) (unsupported)\n");
			    break;
			case MKTAG('a', 't', 'r', 'c'):
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: Sony ATRAC3 (RealAudio 8) (unsupported)\n");
			    break;
			default:
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: Unknown (%s)\n", buf);
		    }
#endif

		    switch (sh->format)
		    {
			case MKTAG('d', 'n', 'e', 't'):
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: DNET -> AC3\n");
//			    sh->format = 0x2000;
			    break;
			case MKTAG('1', '4', '_', '4'):
			case MKTAG('2', '8', '_', '8'):
			case MKTAG('s', 'i', 'p', 'r'):
#if 0
			    sh->format = 0x130;
			    /* for buggy directshow loader */
			    sh->wf->cbSize = 4;
			    sh->wf = realloc(sh->wf, sizeof(WAVEFORMATEX)+sh->wf->cbSize);
			    sh->wf->wBitsPerSample = 0;
			    sh->wf->nAvgBytesPerSec = 1055;
			    sh->wf->nBlockAlign = 19;
//			    sh->wf->nBlockAlign = frame_size / 288;
			    buf[0] = 30;
			    buf[1] = 1;
			    buf[2] = 1;
			    buf[3] = 0;
			    memcpy((sh->wf+18), (char *)&buf[0], 4);
//			    sh->wf[sizeof(WAVEFORMATEX)+1] = 30;
//			    sh->wf[sizeof(WAVEFORMATEX)+2] = 1;
//			    sh->wf[sizeof(WAVEFORMATEX)+3] = 1;
//			    sh->wf[sizeof(WAVEFORMATEX)+4] = 0;
			    break;
#endif
			case MKTAG('a', 't', 'r', 'c'):
#if 0
			    sh->format = 0x270;
			    /* 14 bytes extra header needed ! */
			    sh->wf->cbSize = 14;
			    sh->wf = realloc(sh->wf, sizeof(WAVEFORMATEX)+sh->wf->cbSize);
			    sh->wf->nAvgBytesPerSec = 16537; // 8268
			    sh->wf->nBlockAlign = 384; // 192
			    sh->wf->wBitsPerSample = 0; /* from AVI created by VirtualDub */
			    break;
#endif
			case MKTAG('c', 'o', 'o', 'k'):
			    // realaudio codec plugins - common:
//			    sh->wf->cbSize = 4+2+24;
			    stream_skip(demuxer->stream,3);  // Skip 3 unknown bytes 
			    if (version==5)
			      stream_skip(demuxer->stream,1);  // Skip 1 additional unknown byte 
			    codecdata_length=stream_read_dword(demuxer->stream);
			    sh->wf->cbSize = 10+codecdata_length;
			    sh->wf = realloc(sh->wf, sizeof(WAVEFORMATEX)+sh->wf->cbSize);
			    ((short*)(sh->wf+1))[0]=sub_packet_size;
			    ((short*)(sh->wf+1))[1]=sub_packet_h;
			    ((short*)(sh->wf+1))[2]=flavor;
			    ((short*)(sh->wf+1))[3]=coded_frame_size;
			    ((short*)(sh->wf+1))[4]=codecdata_length;
//			    stream_read(demuxer->stream, ((char*)(sh->wf+1))+6, 24); // extras
			    stream_read(demuxer->stream, ((char*)(sh->wf+1))+10, codecdata_length); // extras
			    break;
			default:
			    mp_msg(MSGT_DEMUX,MSGL_V,"Audio: Unknown (%s)\n", buf);
		    }

		    sh->wf->wFormatTag = sh->format;
		    
		    print_wave_header(sh->wf);

		    if(demuxer->audio->id==stream_id){
			demuxer->audio->id=stream_id;
			sh->ds=demuxer->audio;
			demuxer->audio->sh=sh;
		    }
		    
		    ++a_streams;

#ifdef stream_skip
#undef stream_skip
#endif
		}
		else
//		case MKTAG('V', 'I', 'D', 'O'):
		if(tmp == MKTAG('O', 'D', 'I', 'V'))
		{
		    /* video header */
		    sh_video_t *sh = new_sh_video(demuxer, stream_id);

		    sh->format = stream_read_dword_le(demuxer->stream); /* fourcc */
		    mp_msg(MSGT_DEMUX,MSGL_V,"video fourcc: %.4s (%x)\n", (char *)&sh->format, sh->format);

		    /* emulate BITMAPINFOHEADER */
		    sh->bih = malloc(sizeof(BITMAPINFOHEADER)+12);
		    memset(sh->bih, 0, sizeof(BITMAPINFOHEADER)+12);
	    	    sh->bih->biSize = 48;
		    sh->disp_w = sh->bih->biWidth = stream_read_word(demuxer->stream);
		    sh->disp_h = sh->bih->biHeight = stream_read_word(demuxer->stream);
		    sh->bih->biPlanes = 1;
		    sh->bih->biBitCount = 24;
		    sh->bih->biCompression = sh->format;
		    sh->bih->biSizeImage= sh->bih->biWidth*sh->bih->biHeight*3;

		    sh->fps = (float) stream_read_word(demuxer->stream);
		    if (sh->fps<=0) sh->fps=24; // we probably won't even care about fps
		    sh->frametime = 1.0f/sh->fps;
		    
#if 1
		    stream_skip(demuxer->stream, 4);
#else
		    printf("unknown1: 0x%X  \n",stream_read_dword(demuxer->stream));
		    printf("unknown2: 0x%X  \n",stream_read_word(demuxer->stream));
		    printf("unknown3: 0x%X  \n",stream_read_word(demuxer->stream));
#endif
//		    if(sh->format==0x30335652 || sh->format==0x30325652 )
		    if(1)
		    {
			int tmp=stream_read_word(demuxer->stream);
			if(tmp>0){
			    sh->fps=tmp; sh->frametime = 1.0f/sh->fps;
			}
		    } else {
	    		int fps=stream_read_word(demuxer->stream);
			printf("realvid: ignoring FPS = %d\n",fps);
		    }
		    stream_skip(demuxer->stream, 2);
		    
		    // read codec sub-format (to make difference between low and high rate codec)
		    ((unsigned int*)(sh->bih+1))[0]=stream_read_dword(demuxer->stream);

		    /* h263 hack */
		    tmp = stream_read_dword(demuxer->stream);
		    ((unsigned int*)(sh->bih+1))[1]=tmp;
		    mp_msg(MSGT_DEMUX,MSGL_V,"H.263 ID: %x\n", tmp);
		    switch (tmp)
		    {
			case 0x10000000:
			    /* sub id: 0 */
			    /* codec id: rv10 */
			    break;
			case 0x10003000:
			case 0x10003001:
			    /* sub id: 3 */
			    /* codec id: rv10 */
			    sh->bih->biCompression = sh->format = mmioFOURCC('R', 'V', '1', '3');
			    break;
			case 0x20001000:
			case 0x20100001:
			case 0x20200002:
			    /* codec id: rv20 */
			    break;
			case 0x30202002:
			    /* codec id: rv30 */
			    break;
			case 0x40000000:
			    /* codec id: rv40 */
			    break;
			default:
			    /* codec id: none */
			    mp_msg(MSGT_DEMUX,MSGL_V,"unknown id: %x\n", tmp);
		    }

		    if((sh->format<=0x30335652) && (tmp>=0x20200002)){
			// read secondary WxH for the cmsg24[] (see vd_realvid.c)
			((unsigned short*)(sh->bih+1))[4]=4*(unsigned short)stream_read_char(demuxer->stream); //widht
			((unsigned short*)(sh->bih+1))[5]=4*(unsigned short)stream_read_char(demuxer->stream); //height
		    } 
		    
		    if(demuxer->video->id==stream_id){
			demuxer->video->id=stream_id;
			sh->ds=demuxer->video;
			demuxer->video->sh=sh;
		    }
		    
		    ++v_streams;

		}
		else {
		    mp_msg(MSGT_DEMUX, MSGL_ERR, "Not audio/video stream or unsupported!\n");
		}
//		break;
//	    default:
//skip_this_chunk:
		/* skip codec info */
		tmp = stream_tell(demuxer->stream) - codec_pos;
		mp_msg(MSGT_DEMUX,MSGL_V,"### skipping %d bytes of codec info\n", codec_data_size - tmp);
#if 0
		{ int i;
		  for(i=0;i<codec_data_size - tmp;i++)
		      printf(" %02X",stream_read_char(demuxer->stream));
		  printf("\n");
		}
#else
		stream_skip(demuxer->stream, codec_data_size - tmp);
#endif
		break;
//	    }
	    }
	    case MKTAG('D', 'A', 'T', 'A'):
		goto header_end;
	    case MKTAG('I', 'N', 'D', 'X'):
	    default:
		mp_msg(MSGT_DEMUX,MSGL_V,"Unknown chunk: %x\n", chunk_id);
		stream_skip(demuxer->stream, chunk_size - 10);
		break;
	}
    }

header_end:
//    printf("i=%d num_of_headers=%d   \n",i,num_of_headers);
    priv->num_of_packets = stream_read_dword(demuxer->stream);
//    stream_skip(demuxer->stream, 4); /* number of packets */
    stream_skip(demuxer->stream, 4); /* next data header */

    mp_msg(MSGT_DEMUX,MSGL_V,"Packets in file: %d\n", priv->num_of_packets);

    if (priv->num_of_packets == 0)
	priv->num_of_packets = -10;

    /* disable seeking */
    demuxer->seekable = 0;

    if (index_mode == 2)
	generate_index(demuxer);
    else if (priv->index_chunk_offset && (index_mode == 1))
	parse_index_chunk(demuxer);

    // detect streams:
    if(demuxer->video->id==-1 && v_streams>0){
	// find the valid video stream:
	if(!ds_fill_buffer(demuxer->video)){
          mp_msg(MSGT_DEMUXER,MSGL_INFO,"RM: " MSGTR_MissingVideoStream);
	}
    }
    if(demuxer->audio->id==-1 && a_streams>0){
	// find the valid audio stream:
	if(!ds_fill_buffer(demuxer->audio)){
          mp_msg(MSGT_DEMUXER,MSGL_INFO,"RM: " MSGTR_MissingAudioStream);
	}
    }

    if(demuxer->video->sh){
	sh_video_t *sh=demuxer->video->sh;
	mp_msg(MSGT_DEMUX,MSGL_INFO,"VIDEO:  %.4s [%08X,%08X]  %dx%d  (aspect %4.2f)  %4.2f fps\n",
	    &sh->format,((unsigned int*)(sh->bih+1))[1],((unsigned int*)(sh->bih+1))[0],
	    sh->disp_w,sh->disp_h,sh->aspect,sh->fps);
    }

}

void demux_close_real(demuxer_t *demuxer)
{
    real_priv_t* priv = demuxer->priv;
 
    if (priv)
	free(priv);

    return;
}

/* please upload RV10 samples WITH INDEX CHUNK */
int demux_seek_real(demuxer_t *demuxer, float rel_seek_secs, int flags)
{
    real_priv_t *priv = demuxer->priv;
    demux_stream_t *d_audio = demuxer->audio;
    demux_stream_t *d_video = demuxer->video;
    sh_audio_t *sh_audio = d_audio->sh;
    sh_video_t *sh_video = d_video->sh;
    int vid = d_video->id, aid = d_audio->id;
    int next_offset = 0;
    int rel_seek_frames = 0;
    int streams = 0;

    if ((index_mode != 1) && (index_mode != 2))
	return 0;

    if (sh_video)
	streams |= 1;
    if (sh_audio)
	streams |= 2;

//    printf("streams: %d\n", streams);

    if (!streams)
	return 0;

    if (flags & 1)
	/* seek absolute */
	priv->current_apacket = priv->current_vpacket = 0;

    /* flags & 2 ? */
    if (streams & 1)
        rel_seek_frames = (int)(sh_video->fps*rel_seek_secs);
    else if (streams & 2)
        rel_seek_frames = (int)(rel_seek_secs);

//    printf("rel_seek_frames: %d\n", rel_seek_frames);
    
    if (streams & 2)
	priv->current_apacket += rel_seek_frames;
    if (streams & 1)
	priv->current_vpacket += rel_seek_frames;

    if (
    ((streams & 2) && (priv->current_apacket > priv->index_table_size[aid])) ||
    ((streams & 1) && (priv->current_vpacket > priv->index_table_size[vid])) )
	return 0;

    /* both video and audio stream */
    if (streams == 3)
    {
//    if (priv->current_apacket > priv->current_vpacket)
//    {
	/* search keyframe */
	while (!(priv->index_table[vid][priv->current_vpacket].flags & 0x2))
	    priv->current_vpacket++;
	next_offset = priv->index_table[vid][priv->current_vpacket].offset;
//    }
//    else
//    {
//	next_offset = priv->index_table[aid][priv->current_apacket].offset;
//    }
    }
    else
    {
	if (streams & 1)
	{
	    /* search keyframe */
	    while (!(priv->index_table[vid][priv->current_vpacket].flags & 0x2))
		priv->current_vpacket++;
	    next_offset = priv->index_table[vid][priv->current_vpacket].offset;
	}
	else if (streams & 2)
	{
	    next_offset = priv->index_table[aid][priv->current_apacket].offset;
	}
    }
    
//    printf("seek: pos: %d, current packets: a: %d, v: %d\n",
//	next_offset, priv->current_apacket, priv->current_vpacket);
    return stream_seek(demuxer->stream, next_offset);
}