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1/8 resolution decoding 

Originally committed as revision 3511 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Michael Niedermayer 2004-09-26 10:01:40 +00:00
parent 6aeb03d887
commit 1aa8c57b4a
3 changed files with 23 additions and 0 deletions
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18
libavcodec/dsputil.c
View File

@ -3382,6 +3382,19 @@ static void ff_jref_idct2_add(uint8_t *dest, int line_size, DCTELEM *block)
add_pixels_clamped2_c(block, dest, line_size);
}
static void ff_jref_idct1_put(uint8_t *dest, int line_size, DCTELEM *block)
{
uint8_t *cm = cropTbl + MAX_NEG_CROP;
dest[0] = cm[(block[0] + 4)>>3];
}
static void ff_jref_idct1_add(uint8_t *dest, int line_size, DCTELEM *block)
{
uint8_t *cm = cropTbl + MAX_NEG_CROP;
dest[0] = cm[dest[0] + ((block[0] + 4)>>3)];
}
/* init static data */
void dsputil_static_init(void)
{
@ -3430,6 +3443,11 @@ void dsputil_init(DSPContext* c, AVCodecContext *avctx)
c->idct_add= ff_jref_idct2_add;
c->idct = j_rev_dct2;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else if(avctx->lowres==3){
c->idct_put= ff_jref_idct1_put;
c->idct_add= ff_jref_idct1_add;
c->idct = j_rev_dct1;
c->idct_permutation_type= FF_NO_IDCT_PERM;
}else{
if(avctx->idct_algo==FF_IDCT_INT){
c->idct_put= ff_jref_idct_put;

1
libavcodec/dsputil.h
View File

@ -44,6 +44,7 @@ void ff_fdct248_islow (DCTELEM *data);
void j_rev_dct (DCTELEM *data);
void j_rev_dct4 (DCTELEM *data);
void j_rev_dct2 (DCTELEM *data);
void j_rev_dct1 (DCTELEM *data);
void ff_fdct_mmx(DCTELEM *block);
void ff_fdct_mmx2(DCTELEM *block);

4
libavcodec/jrevdct.c
View File

@ -1640,5 +1640,9 @@ void j_rev_dct2(DCTBLOCK data){
data[1+1*DCTSTRIDE]= (d01 - d11)>>3;
}
void j_rev_dct1(DCTBLOCK data){
data[0] = (data[0] + 4)>>3;
}
#undef FIX
#undef CONST_BITS