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| author | Michael Niedermayer <michaelni@gmx.at> | 2004-02-06 03:56:05 +0000 |
|---|---|---|
| committer | Michael Niedermayer <michaelni@gmx.at> | 2004-02-06 03:56:05 +0000 |
| commit | de7ff1f774e2610d9ac23d2613a9f7e19e8c0f9d (patch) | |
| tree | 88133644518b4922439133352b9ca8a24d0e8781 /libavcodec | |
| parent | 364a17974979dcddf41b7e88b2f34e721ca8855a (diff) | |
| download | ffmpeg-de7ff1f774e2610d9ac23d2613a9f7e19e8c0f9d.tar.gz | |
analyze the gradient of the error surface to avoid a few checks in the quantizing noise shaper
Originally committed as revision 2751 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec')
| -rw-r--r-- | libavcodec/mpegvideo.c | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/libavcodec/mpegvideo.c b/libavcodec/mpegvideo.c index e792f3c852..3dd5443cd5 100644 --- a/libavcodec/mpegvideo.c +++ b/libavcodec/mpegvideo.c @@ -4941,6 +4941,7 @@ static int dct_quantize_refine(MpegEncContext *s, //FIXME breaks denoise? DCTELEM *block, int16_t *weight, DCTELEM *orig, int n, int qscale){ int16_t rem[64]; + DCTELEM d1[64]; const int *qmat; const uint8_t *scantable= s->intra_scantable.scantable; const uint8_t *perm_scantable= s->intra_scantable.permutated; @@ -5061,10 +5062,31 @@ STOP_TIMER("init rem[]") int nochange_score= best_score; int best_coeff=0; int best_change=0; - int run2, best_unquant_change; + int run2, best_unquant_change, analyze_gradient; #ifdef REFINE_STATS {START_TIMER #endif + analyze_gradient = last_non_zero > 2 || s->avctx->quantizer_noise_shaping >= 3; + + if(analyze_gradient){ +#ifdef REFINE_STATS +{START_TIMER +#endif + for(i=0; i<64; i++){ + int w= weight[i]; + + d1[i] = (rem[i]*w*w + (1<<(RECON_SHIFT+12-1)))>>(RECON_SHIFT+12); + } +#ifdef REFINE_STATS +STOP_TIMER("rem*w*w")} +{START_TIMER +#endif + s->dsp.fdct(d1); +#ifdef REFINE_STATS +STOP_TIMER("dct")} +#endif + } + if(start_i){ const int level= block[0]; int change, old_coeff; @@ -5141,6 +5163,13 @@ STOP_TIMER("init rem[]") } }else{ assert(ABS(new_level)==1); + + if(analyze_gradient){ + int g= d1[ scantable[i] ]; + if(g && (g^new_level) >= 0) + continue; + } + if(i < last_non_zero){ int next_i= i + run2 + 1; int next_level= block[ perm_scantable[next_i] ] + 64; |