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Code Issues Releases Activity

Faster checks in reverse_dc_prediction.

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Patch by Dark Shikari

Originally committed as revision 20750 to svn://svn.ffmpeg.org/ffmpeg/trunk
This commit is contained in:
Jason Garrett-Glaser 2009-12-06 15:33:48 +00:00 committed by Carl Eugen Hoyos
parent c11cb37520
commit 50ba3fd713
1 changed files with 7 additions and 7 deletions
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14
libavcodec/vp3.c
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@ -1233,7 +1233,6 @@ static int unpack_dct_coeffs(Vp3DecodeContext *s, GetBitContext *gb)
*/
#define COMPATIBLE_FRAME(x) \
(compatible_frame[s->all_fragments[x].coding_method] == current_frame_type)
#define FRAME_CODED(x) (s->all_fragments[x].coding_method != MODE_COPY)
#define DC_COEFF(u) (s->coeffs[u].index ? 0 : s->coeffs[u].coeff) //FIXME do somethin to simplify this
static void reverse_dc_prediction(Vp3DecodeContext *s,
@ -1290,7 +1289,7 @@ static void reverse_dc_prediction(Vp3DecodeContext *s,
* from other INTRA blocks. There are 2 golden frame coding types;
* blocks encoding in these modes can only predict from other blocks
* that were encoded with these 1 of these 2 modes. */
static const unsigned char compatible_frame[8] = {
static const unsigned char compatible_frame[9] = {
1, /* MODE_INTER_NO_MV */
0, /* MODE_INTRA */
1, /* MODE_INTER_PLUS_MV */
@ -1298,7 +1297,8 @@ static void reverse_dc_prediction(Vp3DecodeContext *s,
1, /* MODE_INTER_PRIOR_MV */
2, /* MODE_USING_GOLDEN */
2, /* MODE_GOLDEN_MV */
1 /* MODE_INTER_FOUR_MV */
1, /* MODE_INTER_FOUR_MV */
3 /* MODE_COPY */
};
int current_frame_type;
@ -1326,24 +1326,24 @@ static void reverse_dc_prediction(Vp3DecodeContext *s,
if(x){
l= i-1;
vl = DC_COEFF(l);
if(FRAME_CODED(l) && COMPATIBLE_FRAME(l))
if(COMPATIBLE_FRAME(l))
transform |= PL;
}
if(y){
u= i-fragment_width;
vu = DC_COEFF(u);
if(FRAME_CODED(u) && COMPATIBLE_FRAME(u))
if(COMPATIBLE_FRAME(u))
transform |= PU;
if(x){
ul= i-fragment_width-1;
vul = DC_COEFF(ul);
if(FRAME_CODED(ul) && COMPATIBLE_FRAME(ul))
if(COMPATIBLE_FRAME(ul))
transform |= PUL;
}
if(x + 1 < fragment_width){
ur= i-fragment_width+1;
vur = DC_COEFF(ur);
if(FRAME_CODED(ur) && COMPATIBLE_FRAME(ur))
if(COMPATIBLE_FRAME(ur))
transform |= PUR;
}
}