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Add a helper function to get the chroma scale shift and use to simplify mpi setup. 

git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@30138 b3059339-0415-0410-9bf9-f77b7e298cf2
This commit is contained in:
reimar 2009-12-30 11:08:44 +00:00
parent 427039acff
commit 92f20f876f
3 changed files with 50 additions and 33 deletions
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37
libmpcodecs/img_format.c
View File

@ -79,3 +79,40 @@ const char *vo_format_name(int format)
snprintf(unknown_format,20,"Unknown 0x%04x",format);
return unknown_format;
}
int mp_get_chroma_shift(int format, int *x_shift, int *y_shift)
{
int xs = 0, ys = 0;
int err = 0;
switch (format) {
case IMGFMT_I420:
case IMGFMT_IYUV:
case IMGFMT_YV12:
xs = 1;
ys = 1;
break;
case IMGFMT_IF09:
case IMGFMT_YVU9:
xs = 2;
ys = 2;
break;
case IMGFMT_444P:
xs = 0;
ys = 0;
break;
case IMGFMT_422P:
xs = 1;
ys = 0;
break;
case IMGFMT_411P:
xs = 2;
ys = 0;
break;
default:
err = 1;
break;
}
if (x_shift) *x_shift = xs;
if (y_shift) *y_shift = ys;
return err ? 0 : 8 + (16 >> (xs + ys));
}

7
libmpcodecs/img_format.h
View File

@ -133,4 +133,11 @@ typedef struct {
const char *vo_format_name(int format);
/**
* Calculates the scale shifts for the chroma planes for planar YUV
*
* \return bits-per-pixel for format if successful (i.e. format is 3 or 4-planes planar YUV), 0 otherwise
*/
int mp_get_chroma_shift(int format, int *x_shift, int *y_shift);
#endif /* MPLAYER_IMG_FORMAT_H */

39
libmpcodecs/mp_image.h
View File

@ -133,51 +133,24 @@ static inline void mp_image_setfmt(mp_image_t* mpi,unsigned int out_fmt){
}
mpi->flags|=MP_IMGFLAG_YUV;
mpi->num_planes=3;
if (mp_get_chroma_shift(out_fmt, NULL, NULL)) {
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp = mp_get_chroma_shift(out_fmt, &mpi->chroma_x_shift, &mpi->chroma_y_shift);
mpi->chroma_width = mpi->width >> mpi->chroma_x_shift;
mpi->chroma_height = mpi->height >> mpi->chroma_y_shift;
}
switch(out_fmt){
case IMGFMT_I420:
case IMGFMT_IYUV:
mpi->flags|=MP_IMGFLAG_SWAPPED;
case IMGFMT_YV12:
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp=12;
mpi->chroma_width=(mpi->width>>1);
mpi->chroma_height=(mpi->height>>1);
mpi->chroma_x_shift=1;
mpi->chroma_y_shift=1;
return;
case IMGFMT_IF09:
mpi->num_planes=4;
case IMGFMT_YVU9:
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp=9;
mpi->chroma_width=(mpi->width>>2);
mpi->chroma_height=(mpi->height>>2);
mpi->chroma_x_shift=2;
mpi->chroma_y_shift=2;
return;
case IMGFMT_444P:
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp=24;
mpi->chroma_width=(mpi->width);
mpi->chroma_height=(mpi->height);
mpi->chroma_x_shift=0;
mpi->chroma_y_shift=0;
return;
case IMGFMT_422P:
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp=16;
mpi->chroma_width=(mpi->width>>1);
mpi->chroma_height=(mpi->height);
mpi->chroma_x_shift=1;
mpi->chroma_y_shift=0;
return;
case IMGFMT_411P:
mpi->flags|=MP_IMGFLAG_PLANAR;
mpi->bpp=12;
mpi->chroma_width=(mpi->width>>2);
mpi->chroma_height=(mpi->height);
mpi->chroma_x_shift=2;
mpi->chroma_y_shift=0;
return;
case IMGFMT_Y800:
case IMGFMT_Y8: