diff options
| -rw-r--r-- | libavcodec/dsputil.c | 18 | ||||
| -rw-r--r-- | libavcodec/dsputil.h | 1 | ||||
| -rw-r--r-- | libavcodec/jrevdct.c | 4 |
3 files changed, 23 insertions, 0 deletions
diff --git a/libavcodec/dsputil.c b/libavcodec/dsputil.c index 9bf409d65e..3db04c00a7 100644 --- a/libavcodec/dsputil.c +++ b/libavcodec/dsputil.c @@ -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; diff --git a/libavcodec/dsputil.h b/libavcodec/dsputil.h index 15f0b6e2a2..fd02e4e035 100644 --- a/libavcodec/dsputil.h +++ b/libavcodec/dsputil.h @@ -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); diff --git a/libavcodec/jrevdct.c b/libavcodec/jrevdct.c index 8bc0d1657d..72412fdc14 100644 --- a/libavcodec/jrevdct.c +++ b/libavcodec/jrevdct.c @@ -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 |