static void Sequence( mpeg_decode* dec )
{
int i;
loadbits(dec);
dec->width = getbits(dec,12);
dec->height = getbits(dec,12);
loadbits(dec);
dec->aspect = getbits(dec,4);
dec->Codec.In.Format.PacketRate.Den = 1001;
dec->Codec.In.Format.PacketRate.Num = FrameRate[getbits(dec,4)];
dec->Codec.FrameTime = Scale(TICKSPERSEC,dec->Codec.In.Format.PacketRate.Den,dec->Codec.In.Format.PacketRate.Num);
loadbits(dec);
dec->Codec.In.Format.ByteRate = getbits(dec,18) * 50;
if (dec->Codec.In.Format.ByteRate > 8*1024*1024)
dec->Codec.In.Format.ByteRate = 0;
flushbits(dec,1); // marker
flushbits(dec,10); // vbv_buffer_size
flushbits(dec,1);
loadbits(dec);
if (getbits1(dec))
{
for (i=0;i<64;i++)
{
loadbits(dec);
dec->IntraMatrix[i] = (uint8_t)getbits(dec,8);
}
}
else
{
for (i=0;i<64;i++)
dec->IntraMatrix[i] = MPEG1_IntraMatrix[dec->zigzag[i]];
}
if (getbits1(dec))
{
for (i=0;i<64;i++)
{
loadbits(dec);
dec->InterMatrix[i] = (uint8_t)getbits(dec, 8);
}
}
else
{
for (i=0;i<64;i++)
dec->InterMatrix[i] = 16;
}
dec->ValidSeq = 1;
}
int getTMNMV ()
{
int code;
if (trace)
fprintf (trace_file, "motion_code (");
if (getbits1 ())
{
if (trace)
fprintf (trace_file, "1): 0\n");
return 0;
}
if ((code = showbits (12)) >= 512)
{
code = (code >> 8) - 2;
flushbits (TMNMVtab0[code].len);
if (trace)
{
fprintf (trace_file, "0");
printbits (code + 2, 4, TMNMVtab0[code].len);
fprintf (trace_file, "): %d\n", TMNMVtab0[code].val);
}
return TMNMVtab0[code].val;
}
// max 9 bits
static INLINE int getDCsizeLum( mpeg_decode* dec )
{
int i,code;
if (!getbits1(dec))
return getbits(dec,1)+1;
if (!getbits1(dec))
return getbits(dec,1)*3;
code = showbits(dec,7);
for (i=1;i<8;i++,code<<=1)
if (!(code & 64))
{
flushbits(dec,i);
return i+3;
}
flushbits(dec,7);
return 11;
}
// max 10 bits
static INLINE int getDCsizeChr( mpeg_decode* dec )
{
int i,code;
if (!getbits1(dec))
return getbits(dec,1);
code = showbits(dec,9);
for (i=1;i<10;i++,code<<=1)
if (!(code & 256))
{
flushbits(dec,i);
return i+1;
}
flushbits(dec,9);
return 11;
}
int gethdr_h263( mp4_decode *dec )
{
int code;
bytealign(dec);
loadbits(dec);
code = getbits(dec,22-8);
while (!eofbits(dec))
{
loadbits(dec);
code = ((code << 8) + getbits(dec,8)) & 0x3FFFFF;
if (code == 32)
break;
}
if (code != 32)
return 0;
flushbits(dec,8); // picture timestamp
loadbits(dec);
if (!getbits1(dec)) // marker
return 0;
if (getbits1(dec)) // h263 id
return 0;
flushbits(dec,3);
code = getbits(dec,3); // format
if (code == 6 || code == 7)
{
if (dec->showerror)
{
dec->showerror = 0;
ShowError(dec->Codec.Node.Class,MPEG4_ID,MPEG4_ERROR_H263);
}
//todo: finish
return 0;
}
else
{
static const int size[8][2] = {
{ 0,0 },
{ 128,96 },
{ 176,144 },
{ 352,288 },
{ 704,576 },
{ 1408,1152 }};
int width = size[code][0];
int height = size[code][1];
if (!dec->ignoresize && (!width || CodecIDCTSetFormat(&dec->Codec,PF_YUV420,
dec->Codec.In.Format.Video.Width,dec->Codec.In.Format.Video.Height,width,height) != ERR_NONE))
{
dec->validvol = 0;
return 0;
}
loadbits(dec);
dec->prediction_type = getbits(dec,1);
dec->long_vectors = (char)getbits(dec,1);
if (getbits1(dec)) // sac not supported
return 0;
getbits(dec,1); // obmc
if (getbits1(dec)) // pb frame not supported
return 0;
dec->quantizer = getbits(dec,5);
flushbits(dec,1);
dec->rounding = 0;
}
while (getbits1(dec)) // pei
{
flushbits(dec,8);
loadbits(dec);
}
dec->fcode_for = 1;
dec->validvol = 1;
dec->Codec.IDCT.Ptr->Set(dec->Codec.IDCT.Ptr,IDCT_ROUNDING,&dec->rounding,sizeof(bool_t));
return 1;
}
