diff options
author | Michael Niedermayer <michaelni@gmx.at> | 2007-09-23 21:11:36 +0000 |
---|---|---|
committer | Michael Niedermayer <michaelni@gmx.at> | 2007-09-23 21:11:36 +0000 |
commit | ff193e6419543659dcb8ea42af7951f45fcacc70 (patch) | |
tree | 2c515e36e0a820adf3d216f35212e0345a4ae419 /libavcodec/snow.c | |
parent | 8b03def65f6b7d6591aabf1cbd26821f782e19b7 (diff) | |
download | ffmpeg-ff193e6419543659dcb8ea42af7951f45fcacc70.tar.gz |
some experimental iterative quantization code
disabled as it is VERY slow
gain is 0.1-0.2 psnr at low qp
Originally committed as revision 10556 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/snow.c')
-rw-r--r-- | libavcodec/snow.c | 125 |
1 files changed, 123 insertions, 2 deletions
diff --git a/libavcodec/snow.c b/libavcodec/snow.c index 0300e58c7c..777ac6f14b 100644 --- a/libavcodec/snow.c +++ b/libavcodec/snow.c @@ -3922,6 +3922,123 @@ static void calculate_vissual_weight(SnowContext *s, Plane *p){ } } +#define QUANTIZE2 0 + +#if QUANTIZE2==1 +#define Q2_STEP 8 + +static void find_sse(SnowContext *s, Plane *p, int *score, int score_stride, IDWTELEM *r0, IDWTELEM *r1, int level, int orientation){ + SubBand *b= &p->band[level][orientation]; + int x, y; + int xo=0; + int yo=0; + int step= 1 << (s->spatial_decomposition_count - level); + + if(orientation&1) + xo= step>>1; + if(orientation&2) + yo= step>>1; + + //FIXME bias for non zero ? + //FIXME optimize + memset(score, 0, sizeof(*score)*score_stride*((p->height + Q2_STEP-1)/Q2_STEP)); + for(y=0; y<p->height; y++){ + for(x=0; x<p->width; x++){ + int sx= (x-xo + step/2) / step / Q2_STEP; + int sy= (y-yo + step/2) / step / Q2_STEP; + int v= r0[x + y*p->width] - r1[x + y*p->width]; + assert(sx>=0 && sy>=0 && sx < score_stride); + v= ((v+8)>>4)<<4; + score[sx + sy*score_stride] += v*v; + assert(score[sx + sy*score_stride] >= 0); + } + } +} + +static void dequantize_all(SnowContext *s, Plane *p, IDWTELEM *buffer, int width, int height){ + int level, orientation; + + for(level=0; level<s->spatial_decomposition_count; level++){ + for(orientation=level ? 1 : 0; orientation<4; orientation++){ + SubBand *b= &p->band[level][orientation]; + IDWTELEM *dst= buffer + (b->ibuf - s->spatial_idwt_buffer); + + dequantize(s, b, dst, b->stride); + } + } +} + +static void dwt_quantize(SnowContext *s, Plane *p, DWTELEM *buffer, int width, int height, int stride, int type){ + int level, orientation, ys, xs, x, y, pass; + IDWTELEM best_dequant[height * stride]; + IDWTELEM idwt2_buffer[height * stride]; + const int score_stride= (width + 10)/Q2_STEP; + int best_score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size + int score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size + int threshold= (s->m.lambda * s->m.lambda) >> 6; + + //FIXME pass the copy cleanly ? + +// memcpy(dwt_buffer, buffer, height * stride * sizeof(DWTELEM)); + ff_spatial_dwt(buffer, width, height, stride, type, s->spatial_decomposition_count); + + for(level=0; level<s->spatial_decomposition_count; level++){ + for(orientation=level ? 1 : 0; orientation<4; orientation++){ + SubBand *b= &p->band[level][orientation]; + IDWTELEM *dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer); + DWTELEM *src= buffer + (b-> buf - s->spatial_dwt_buffer); + assert(src == b->buf); // code doesnt depen on this but its true currently + + quantize(s, b, dst, src, b->stride, s->qbias); + } + } + for(pass=0; pass<1; pass++){ + if(s->qbias == 0) //keyframe + continue; + for(level=0; level<s->spatial_decomposition_count; level++){ + for(orientation=level ? 1 : 0; orientation<4; orientation++){ + SubBand *b= &p->band[level][orientation]; + IDWTELEM *dst= idwt2_buffer + (b->ibuf - s->spatial_idwt_buffer); + IDWTELEM *best_dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer); + + for(ys= 0; ys<Q2_STEP; ys++){ + for(xs= 0; xs<Q2_STEP; xs++){ + memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); + dequantize_all(s, p, idwt2_buffer, width, height); + ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count); + find_sse(s, p, best_score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation); + memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); + for(y=ys; y<b->height; y+= Q2_STEP){ + for(x=xs; x<b->width; x+= Q2_STEP){ + if(dst[x + y*b->stride]<0) dst[x + y*b->stride]++; + if(dst[x + y*b->stride]>0) dst[x + y*b->stride]--; + //FIXME try more then just -- + } + } + dequantize_all(s, p, idwt2_buffer, width, height); + ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count); + find_sse(s, p, score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation); + for(y=ys; y<b->height; y+= Q2_STEP){ + for(x=xs; x<b->width; x+= Q2_STEP){ + int score_idx= x/Q2_STEP + (y/Q2_STEP)*score_stride; + if(score[score_idx] <= best_score[score_idx] + threshold){ + best_score[score_idx]= score[score_idx]; + if(best_dst[x + y*b->stride]<0) best_dst[x + y*b->stride]++; + if(best_dst[x + y*b->stride]>0) best_dst[x + y*b->stride]--; + //FIXME copy instead + } + } + } + } + } + } + } + } + memcpy(s->spatial_idwt_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); //FIXME work with that directly insteda of copy at the end +} + +#endif + static int encode_init(AVCodecContext *avctx) { SnowContext *s = avctx->priv_data; @@ -4273,7 +4390,10 @@ redo_frame: } } - ff_spatial_dwt(s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count); + if(QUANTIZE2) + dwt_quantize(s, p, s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type); + else + ff_spatial_dwt(s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count); if(s->pass1_rc && plane_index==0){ int delta_qlog = ratecontrol_1pass(s, pict); @@ -4293,7 +4413,8 @@ redo_frame: for(orientation=level ? 1 : 0; orientation<4; orientation++){ SubBand *b= &p->band[level][orientation]; - quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias); + if(!QUANTIZE2) + quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias); if(orientation==0) decorrelate(s, b, b->ibuf, b->stride, pict->pict_type == P_TYPE, 0); encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation); |