static int UpdateInput( mpeg_decode* dec )
{
int Result = ERR_NONE;
IDCT_BLOCK_PREPARE(dec,dec->blockptr);
dec->mb_xsize = 0;
dec->mb_ysize = 0;
dec->pos_end = 0;
dec->refframe = 0;
dec->Frame = 0;
dec->ValidSeq = 0;
dec->ErrorShowed = 0;
dec->OnlyIVOP = 1;
memcpy(dec->zigzag,zigzag,sizeof(zigzag));
if (dec->Codec.In.Format.Type == PACKET_VIDEO)
Result = CodecIDCTSetFormat(&dec->Codec,PF_YUV420,dec->Codec.In.Format.Format.Video.Width,dec->Codec.In.Format.Format.Video.Height,
dec->Codec.In.Format.Format.Video.Width,dec->Codec.In.Format.Format.Video.Height,
dec->Codec.In.Format.Format.Video.Aspect);
return Result;
}
static void Picture( mpeg_decode* dec )
{
static const int16_t aspect[16] =
{
0,10000, 6735, 7031,
7615, 8055, 8437, 8935,
9157, 9815,10255,10695,
10950,11575,12015, 0,
};
if (!dec->Codec.In.Format.Format.Video.Aspect && aspect[dec->aspect])
dec->Codec.In.Format.Format.Video.Aspect = Scale(ASPECT_ONE,10000,aspect[dec->aspect]);
CodecIDCTSetFormat(&dec->Codec,PF_YUV420,dec->width,dec->height,dec->width,dec->height,dec->Codec.In.Format.Format.Video.Aspect);
flushbits(dec,10); // temporal ref
loadbits(dec);
dec->prediction_type = getbits(dec,3);
flushbits(dec,16); // non constant bit rate
loadbits(dec);
if (dec->prediction_type == P_VOP || dec->prediction_type == B_VOP)
{
dec->full_pixel[0] = getbits(dec,1);
dec->fcode[0] = getbits(dec,3)-1;
}
if (dec->prediction_type == B_VOP)
{
dec->full_pixel[1] = getbits(dec,1);
dec->fcode[1] = getbits(dec,3)-1;
}
dec->frame_state = 1;
DEBUG_MSG1(DEBUG_VCODEC,T("MPEG Picture:%d"),dec->prediction_type);
}
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;
}
