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* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
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* This file is part of Libav.
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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* Libav is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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* You should have received a copy of the GNU Lesser General Public
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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#include "libavutil/intmath.h"
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#include "libavutil/log.h"
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#include "libavutil/opt.h"
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#include "rangecoder.h"
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#include "mpegvideo.h"
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static void find_sse(SnowContext *s, Plane *p, int *score, int score_stride, IDWTELEM *r0, IDWTELEM *r1, int level, int orientation){
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SubBand *b= &p->band[level][orientation];
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int step= 1 << (s->spatial_decomposition_count - level);
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//FIXME bias for nonzero ?
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memset(score, 0, sizeof(*score)*score_stride*((p->height + Q2_STEP-1)/Q2_STEP));
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for(y=0; y<p->height; y++){
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for(x=0; x<p->width; x++){
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int sx= (x-xo + step/2) / step / Q2_STEP;
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int sy= (y-yo + step/2) / step / Q2_STEP;
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int v= r0[x + y*p->width] - r1[x + y*p->width];
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assert(sx>=0 && sy>=0 && sx < score_stride);
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score[sx + sy*score_stride] += v*v;
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assert(score[sx + sy*score_stride] >= 0);
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static void dequantize_all(SnowContext *s, Plane *p, IDWTELEM *buffer, int width, int height){
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int level, orientation;
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for(level=0; level<s->spatial_decomposition_count; level++){
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for(orientation=level ? 1 : 0; orientation<4; orientation++){
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SubBand *b= &p->band[level][orientation];
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IDWTELEM *dst= buffer + (b->ibuf - s->spatial_idwt_buffer);
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dequantize(s, b, dst, b->stride);
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static void dwt_quantize(SnowContext *s, Plane *p, DWTELEM *buffer, int width, int height, int stride, int type){
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int level, orientation, ys, xs, x, y, pass;
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IDWTELEM best_dequant[height * stride];
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IDWTELEM idwt2_buffer[height * stride];
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const int score_stride= (width + 10)/Q2_STEP;
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int best_score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
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int score[(width + 10)/Q2_STEP * (height + 10)/Q2_STEP]; //FIXME size
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int threshold= (s->m.lambda * s->m.lambda) >> 6;
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//FIXME pass the copy cleanly ?
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// memcpy(dwt_buffer, buffer, height * stride * sizeof(DWTELEM));
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ff_spatial_dwt(buffer, width, height, stride, type, s->spatial_decomposition_count);
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for(level=0; level<s->spatial_decomposition_count; level++){
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for(orientation=level ? 1 : 0; orientation<4; orientation++){
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SubBand *b= &p->band[level][orientation];
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IDWTELEM *dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
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DWTELEM *src= buffer + (b-> buf - s->spatial_dwt_buffer);
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assert(src == b->buf); // code does not depend on this but it is true currently
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quantize(s, b, dst, src, b->stride, s->qbias);
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for(pass=0; pass<1; pass++){
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if(s->qbias == 0) //keyframe
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for(level=0; level<s->spatial_decomposition_count; level++){
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for(orientation=level ? 1 : 0; orientation<4; orientation++){
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SubBand *b= &p->band[level][orientation];
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IDWTELEM *dst= idwt2_buffer + (b->ibuf - s->spatial_idwt_buffer);
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IDWTELEM *best_dst= best_dequant + (b->ibuf - s->spatial_idwt_buffer);
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for(ys= 0; ys<Q2_STEP; ys++){
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for(xs= 0; xs<Q2_STEP; xs++){
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memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
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dequantize_all(s, p, idwt2_buffer, width, height);
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ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count);
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find_sse(s, p, best_score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
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memcpy(idwt2_buffer, best_dequant, height * stride * sizeof(IDWTELEM));
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for(y=ys; y<b->height; y+= Q2_STEP){
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for(x=xs; x<b->width; x+= Q2_STEP){
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if(dst[x + y*b->stride]<0) dst[x + y*b->stride]++;
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if(dst[x + y*b->stride]>0) dst[x + y*b->stride]--;
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//FIXME try more than just --
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dequantize_all(s, p, idwt2_buffer, width, height);
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ff_spatial_idwt(idwt2_buffer, width, height, stride, type, s->spatial_decomposition_count);
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find_sse(s, p, score, score_stride, idwt2_buffer, s->spatial_idwt_buffer, level, orientation);
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for(y=ys; y<b->height; y+= Q2_STEP){
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for(x=xs; x<b->width; x+= Q2_STEP){
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int score_idx= x/Q2_STEP + (y/Q2_STEP)*score_stride;
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if(score[score_idx] <= best_score[score_idx] + threshold){
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best_score[score_idx]= score[score_idx];
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if(best_dst[x + y*b->stride]<0) best_dst[x + y*b->stride]++;
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if(best_dst[x + y*b->stride]>0) best_dst[x + y*b->stride]--;
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memcpy(s->spatial_idwt_buffer, best_dequant, height * stride * sizeof(IDWTELEM)); //FIXME work with that directly instead of copy at the end
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#endif /* QUANTIZE2==1 */
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#if CONFIG_SNOW_ENCODER
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static av_cold int encode_init(AVCodecContext *avctx)
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SnowContext *s = avctx->priv_data;
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if(avctx->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){
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av_log(avctx, AV_LOG_ERROR, "This codec is under development, files encoded with it may not be decodable with future versions!!!\n"
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"Use vstrict=-2 / -strict -2 to use it anyway.\n");
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if(avctx->prediction_method == DWT_97
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&& (avctx->flags & CODEC_FLAG_QSCALE)
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&& avctx->global_quality == 0){
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av_log(avctx, AV_LOG_ERROR, "The 9/7 wavelet is incompatible with lossless mode.\n");
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s->spatial_decomposition_type= avctx->prediction_method; //FIXME add decorrelator type r transform_type
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s->mv_scale = (avctx->flags & CODEC_FLAG_QPEL) ? 2 : 4;
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s->block_max_depth= (avctx->flags & CODEC_FLAG_4MV ) ? 1 : 0;
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for(plane_index=0; plane_index<3; plane_index++){
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s->plane[plane_index].diag_mc= 1;
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s->plane[plane_index].htaps= 6;
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s->plane[plane_index].hcoeff[0]= 40;
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s->plane[plane_index].hcoeff[1]= -10;
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s->plane[plane_index].hcoeff[2]= 2;
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s->plane[plane_index].fast_mc= 1;
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ff_snow_common_init(avctx);
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ff_snow_alloc_blocks(s);
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s->m.flags = avctx->flags;
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s->m.bit_rate= avctx->bit_rate;
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s->m.me.scratchpad= av_mallocz((avctx->width+64)*2*16*2*sizeof(uint8_t));
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s->m.me.map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
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s->m.me.score_map = av_mallocz(ME_MAP_SIZE*sizeof(uint32_t));
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s->m.obmc_scratchpad= av_mallocz(MB_SIZE*MB_SIZE*12*sizeof(uint32_t));
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h263_encode_init(&s->m); //mv_penalty
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s->max_ref_frames = FFMAX(FFMIN(avctx->refs, MAX_REF_FRAMES), 1);
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if(avctx->flags&CODEC_FLAG_PASS1){
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if(!avctx->stats_out)
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avctx->stats_out = av_mallocz(256);
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if((avctx->flags&CODEC_FLAG_PASS2) || !(avctx->flags&CODEC_FLAG_QSCALE)){
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if(ff_rate_control_init(&s->m) < 0)
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s->pass1_rc= !(avctx->flags & (CODEC_FLAG_QSCALE|CODEC_FLAG_PASS2));
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avctx->coded_frame= &s->current_picture;
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switch(avctx->pix_fmt){
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// case PIX_FMT_YUV444P:
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// case PIX_FMT_YUV422P:
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case PIX_FMT_YUV420P:
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// case PIX_FMT_YUV411P:
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// case PIX_FMT_YUV410P:
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s->colorspace_type= 0;
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/* case PIX_FMT_RGB32:
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av_log(avctx, AV_LOG_ERROR, "pixel format not supported\n");
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// avcodec_get_chroma_sub_sample(avctx->pix_fmt, &s->chroma_h_shift, &s->chroma_v_shift);
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s->chroma_h_shift= 1;
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s->chroma_v_shift= 1;
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ff_set_cmp(&s->dsp, s->dsp.me_cmp, s->avctx->me_cmp);
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ff_set_cmp(&s->dsp, s->dsp.me_sub_cmp, s->avctx->me_sub_cmp);
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s->avctx->get_buffer(s->avctx, &s->input_picture);
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if(s->avctx->me_method == ME_ITER){
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int size= s->b_width * s->b_height << 2*s->block_max_depth;
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for(i=0; i<s->max_ref_frames; i++){
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s->ref_mvs[i]= av_mallocz(size*sizeof(int16_t[2]));
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s->ref_scores[i]= av_mallocz(size*sizeof(uint32_t));
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//near copy & paste from dsputil, FIXME
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static int pix_sum(uint8_t * pix, int line_size, int w)
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for (i = 0; i < w; i++) {
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for (j = 0; j < w; j++) {
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pix += line_size - w;
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//near copy & paste from dsputil, FIXME
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static int pix_norm1(uint8_t * pix, int line_size, int w)
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uint32_t *sq = ff_squareTbl + 256;
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for (i = 0; i < w; i++) {
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for (j = 0; j < w; j ++) {
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pix += line_size - w;
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#define P_TOPRIGHT P[3]
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#define P_MEDIAN P[4]
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#define FLAG_QPEL 1 //must be 1
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static int encode_q_branch(SnowContext *s, int level, int x, int y){
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uint8_t p_buffer[1024];
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uint8_t i_buffer[1024];
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uint8_t p_state[sizeof(s->block_state)];
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uint8_t i_state[sizeof(s->block_state)];
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uint8_t *pbbak= s->c.bytestream;
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uint8_t *pbbak_start= s->c.bytestream_start;
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int score, score2, iscore, i_len, p_len, block_s, sum, base_bits;
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const int w= s->b_width << s->block_max_depth;
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const int h= s->b_height << s->block_max_depth;
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const int rem_depth= s->block_max_depth - level;
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const int index= (x + y*w) << rem_depth;
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const int block_w= 1<<(LOG2_MB_SIZE - level);
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int trx= (x+1)<<rem_depth;
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int try= (y+1)<<rem_depth;
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const BlockNode *left = x ? &s->block[index-1] : &null_block;
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const BlockNode *top = y ? &s->block[index-w] : &null_block;
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const BlockNode *right = trx<w ? &s->block[index+1] : &null_block;
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const BlockNode *bottom= try<h ? &s->block[index+w] : &null_block;
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const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
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const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
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int pl = left->color[0];
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int pcb= left->color[1];
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int pcr= left->color[2];
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const int stride= s->current_picture.linesize[0];
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const int uvstride= s->current_picture.linesize[1];
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uint8_t *current_data[3]= { s->input_picture.data[0] + (x + y* stride)*block_w,
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s->input_picture.data[1] + (x + y*uvstride)*block_w/2,
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s->input_picture.data[2] + (x + y*uvstride)*block_w/2};
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int16_t last_mv[3][2];
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int qpel= !!(s->avctx->flags & CODEC_FLAG_QPEL); //unused
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const int shift= 1+qpel;
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MotionEstContext *c= &s->m.me;
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int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
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int mx_context= av_log2(2*FFABS(left->mx - top->mx));
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int my_context= av_log2(2*FFABS(left->my - top->my));
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int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
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int ref, best_ref, ref_score, ref_mx, ref_my;
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assert(sizeof(s->block_state) >= 256);
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set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
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// clip predictors / edge ?
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P_TOPRIGHT[0]= tr->mx;
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P_TOPRIGHT[1]= tr->my;
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last_mv[0][0]= s->block[index].mx;
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last_mv[0][1]= s->block[index].my;
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last_mv[1][0]= right->mx;
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last_mv[1][1]= right->my;
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last_mv[2][0]= bottom->mx;
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last_mv[2][1]= bottom->my;
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assert(c-> stride == stride);
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assert(c->uvstride == uvstride);
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c->penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_cmp);
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c->sub_penalty_factor= get_penalty_factor(s->lambda, s->lambda2, c->avctx->me_sub_cmp);
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c->mb_penalty_factor = get_penalty_factor(s->lambda, s->lambda2, c->avctx->mb_cmp);
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c->current_mv_penalty= c->mv_penalty[s->m.f_code=1] + MAX_MV;
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c->xmin = - x*block_w - 16+3;
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c->ymin = - y*block_w - 16+3;
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c->xmax = - (x+1)*block_w + (w<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
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c->ymax = - (y+1)*block_w + (h<<(LOG2_MB_SIZE - s->block_max_depth)) + 16-3;
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if(P_LEFT[0] > (c->xmax<<shift)) P_LEFT[0] = (c->xmax<<shift);
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if(P_LEFT[1] > (c->ymax<<shift)) P_LEFT[1] = (c->ymax<<shift);
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if(P_TOP[0] > (c->xmax<<shift)) P_TOP[0] = (c->xmax<<shift);
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if(P_TOP[1] > (c->ymax<<shift)) P_TOP[1] = (c->ymax<<shift);
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if(P_TOPRIGHT[0] < (c->xmin<<shift)) P_TOPRIGHT[0]= (c->xmin<<shift);
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if(P_TOPRIGHT[0] > (c->xmax<<shift)) P_TOPRIGHT[0]= (c->xmax<<shift); //due to pmx no clip
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if(P_TOPRIGHT[1] > (c->ymax<<shift)) P_TOPRIGHT[1]= (c->ymax<<shift);
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P_MEDIAN[0]= mid_pred(P_LEFT[0], P_TOP[0], P_TOPRIGHT[0]);
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P_MEDIAN[1]= mid_pred(P_LEFT[1], P_TOP[1], P_TOPRIGHT[1]);
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c->pred_x= P_LEFT[0];
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c->pred_y= P_LEFT[1];
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c->pred_x = P_MEDIAN[0];
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c->pred_y = P_MEDIAN[1];
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for(ref=0; ref<s->ref_frames; ref++){
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init_ref(c, current_data, s->last_picture[ref].data, NULL, block_w*x, block_w*y, 0);
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ref_score= ff_epzs_motion_search(&s->m, &ref_mx, &ref_my, P, 0, /*ref_index*/ 0, last_mv,
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(1<<16)>>shift, level-LOG2_MB_SIZE+4, block_w);
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assert(ref_mx >= c->xmin);
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assert(ref_mx <= c->xmax);
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assert(ref_my >= c->ymin);
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assert(ref_my <= c->ymax);
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ref_score= c->sub_motion_search(&s->m, &ref_mx, &ref_my, ref_score, 0, 0, level-LOG2_MB_SIZE+4, block_w);
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ref_score= ff_get_mb_score(&s->m, ref_mx, ref_my, 0, 0, level-LOG2_MB_SIZE+4, block_w, 0);
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ref_score+= 2*av_log2(2*ref)*c->penalty_factor;
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s->ref_mvs[ref][index][0]= ref_mx;
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s->ref_mvs[ref][index][1]= ref_my;
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s->ref_scores[ref][index]= ref_score;
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if(score > ref_score){
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//FIXME if mb_cmp != SSE then intra cannot be compared currently and mb_penalty vs. lambda2
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base_bits= get_rac_count(&s->c) - 8*(s->c.bytestream - s->c.bytestream_start);
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pc.bytestream= p_buffer; //FIXME end/start? and at the other stoo
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memcpy(p_state, s->block_state, sizeof(s->block_state));
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if(level!=s->block_max_depth)
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put_rac(&pc, &p_state[4 + s_context], 1);
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put_rac(&pc, &p_state[1 + left->type + top->type], 0);
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if(s->ref_frames > 1)
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put_symbol(&pc, &p_state[128 + 1024 + 32*ref_context], best_ref, 0);
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pred_mv(s, &pmx, &pmy, best_ref, left, top, tr);
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put_symbol(&pc, &p_state[128 + 32*(mx_context + 16*!!best_ref)], mx - pmx, 1);
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put_symbol(&pc, &p_state[128 + 32*(my_context + 16*!!best_ref)], my - pmy, 1);
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p_len= pc.bytestream - pc.bytestream_start;
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score += (s->lambda2*(get_rac_count(&pc)-base_bits))>>FF_LAMBDA_SHIFT;
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block_s= block_w*block_w;
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sum = pix_sum(current_data[0], stride, block_w);
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l= (sum + block_s/2)/block_s;
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iscore = pix_norm1(current_data[0], stride, block_w) - 2*l*sum + l*l*block_s;
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block_s= block_w*block_w>>2;
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sum = pix_sum(current_data[1], uvstride, block_w>>1);
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cb= (sum + block_s/2)/block_s;
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// iscore += pix_norm1(¤t_mb[1][0], uvstride, block_w>>1) - 2*cb*sum + cb*cb*block_s;
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sum = pix_sum(current_data[2], uvstride, block_w>>1);
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cr= (sum + block_s/2)/block_s;
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// iscore += pix_norm1(¤t_mb[2][0], uvstride, block_w>>1) - 2*cr*sum + cr*cr*block_s;
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ic.bytestream= i_buffer; //FIXME end/start? and at the other stoo
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memcpy(i_state, s->block_state, sizeof(s->block_state));
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if(level!=s->block_max_depth)
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put_rac(&ic, &i_state[4 + s_context], 1);
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put_rac(&ic, &i_state[1 + left->type + top->type], 1);
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put_symbol(&ic, &i_state[32], l-pl , 1);
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put_symbol(&ic, &i_state[64], cb-pcb, 1);
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put_symbol(&ic, &i_state[96], cr-pcr, 1);
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i_len= ic.bytestream - ic.bytestream_start;
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iscore += (s->lambda2*(get_rac_count(&ic)-base_bits))>>FF_LAMBDA_SHIFT;
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// assert(score==256*256*256*64-1);
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assert(iscore < 255*255*256 + s->lambda2*10);
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assert(l>=0 && l<=255);
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assert(pl>=0 && pl<=255);
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int varc= iscore >> 8;
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int vard= score >> 8;
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if (vard <= 64 || vard < varc)
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c->scene_change_score+= ff_sqrt(vard) - ff_sqrt(varc);
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c->scene_change_score+= s->m.qscale;
487
if(level!=s->block_max_depth){
488
put_rac(&s->c, &s->block_state[4 + s_context], 0);
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score2 = encode_q_branch(s, level+1, 2*x+0, 2*y+0);
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score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+0);
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score2+= encode_q_branch(s, level+1, 2*x+0, 2*y+1);
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score2+= encode_q_branch(s, level+1, 2*x+1, 2*y+1);
493
score2+= s->lambda2>>FF_LAMBDA_SHIFT; //FIXME exact split overhead
495
if(score2 < score && score2 < iscore)
500
pred_mv(s, &pmx, &pmy, 0, left, top, tr);
501
memcpy(pbbak, i_buffer, i_len);
503
s->c.bytestream_start= pbbak_start;
504
s->c.bytestream= pbbak + i_len;
505
set_blocks(s, level, x, y, l, cb, cr, pmx, pmy, 0, BLOCK_INTRA);
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memcpy(s->block_state, i_state, sizeof(s->block_state));
509
memcpy(pbbak, p_buffer, p_len);
511
s->c.bytestream_start= pbbak_start;
512
s->c.bytestream= pbbak + p_len;
513
set_blocks(s, level, x, y, pl, pcb, pcr, mx, my, best_ref, 0);
514
memcpy(s->block_state, p_state, sizeof(s->block_state));
519
static void encode_q_branch2(SnowContext *s, int level, int x, int y){
520
const int w= s->b_width << s->block_max_depth;
521
const int rem_depth= s->block_max_depth - level;
522
const int index= (x + y*w) << rem_depth;
523
int trx= (x+1)<<rem_depth;
524
BlockNode *b= &s->block[index];
525
const BlockNode *left = x ? &s->block[index-1] : &null_block;
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const BlockNode *top = y ? &s->block[index-w] : &null_block;
527
const BlockNode *tl = y && x ? &s->block[index-w-1] : left;
528
const BlockNode *tr = y && trx<w && ((x&1)==0 || level==0) ? &s->block[index-w+(1<<rem_depth)] : tl; //FIXME use lt
529
int pl = left->color[0];
530
int pcb= left->color[1];
531
int pcr= left->color[2];
533
int ref_context= av_log2(2*left->ref) + av_log2(2*top->ref);
534
int mx_context= av_log2(2*FFABS(left->mx - top->mx)) + 16*!!b->ref;
535
int my_context= av_log2(2*FFABS(left->my - top->my)) + 16*!!b->ref;
536
int s_context= 2*left->level + 2*top->level + tl->level + tr->level;
539
set_blocks(s, level, x, y, pl, pcb, pcr, 0, 0, 0, BLOCK_INTRA);
543
if(level!=s->block_max_depth){
544
if(same_block(b,b+1) && same_block(b,b+w) && same_block(b,b+w+1)){
545
put_rac(&s->c, &s->block_state[4 + s_context], 1);
547
put_rac(&s->c, &s->block_state[4 + s_context], 0);
548
encode_q_branch2(s, level+1, 2*x+0, 2*y+0);
549
encode_q_branch2(s, level+1, 2*x+1, 2*y+0);
550
encode_q_branch2(s, level+1, 2*x+0, 2*y+1);
551
encode_q_branch2(s, level+1, 2*x+1, 2*y+1);
555
if(b->type & BLOCK_INTRA){
556
pred_mv(s, &pmx, &pmy, 0, left, top, tr);
557
put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 1);
558
put_symbol(&s->c, &s->block_state[32], b->color[0]-pl , 1);
559
put_symbol(&s->c, &s->block_state[64], b->color[1]-pcb, 1);
560
put_symbol(&s->c, &s->block_state[96], b->color[2]-pcr, 1);
561
set_blocks(s, level, x, y, b->color[0], b->color[1], b->color[2], pmx, pmy, 0, BLOCK_INTRA);
563
pred_mv(s, &pmx, &pmy, b->ref, left, top, tr);
564
put_rac(&s->c, &s->block_state[1 + (left->type&1) + (top->type&1)], 0);
565
if(s->ref_frames > 1)
566
put_symbol(&s->c, &s->block_state[128 + 1024 + 32*ref_context], b->ref, 0);
567
put_symbol(&s->c, &s->block_state[128 + 32*mx_context], b->mx - pmx, 1);
568
put_symbol(&s->c, &s->block_state[128 + 32*my_context], b->my - pmy, 1);
569
set_blocks(s, level, x, y, pl, pcb, pcr, b->mx, b->my, b->ref, 0);
573
static int get_dc(SnowContext *s, int mb_x, int mb_y, int plane_index){
575
Plane *p= &s->plane[plane_index];
576
const int block_size = MB_SIZE >> s->block_max_depth;
577
const int block_w = plane_index ? block_size/2 : block_size;
578
const uint8_t *obmc = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
579
const int obmc_stride= plane_index ? block_size : 2*block_size;
580
const int ref_stride= s->current_picture.linesize[plane_index];
581
uint8_t *src= s-> input_picture.data[plane_index];
582
IDWTELEM *dst= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4; //FIXME change to unsigned
583
const int b_stride = s->b_width << s->block_max_depth;
584
const int w= p->width;
585
const int h= p->height;
586
int index= mb_x + mb_y*b_stride;
587
BlockNode *b= &s->block[index];
588
BlockNode backup= *b;
592
b->type|= BLOCK_INTRA;
593
b->color[plane_index]= 0;
594
memset(dst, 0, obmc_stride*obmc_stride*sizeof(IDWTELEM));
597
int mb_x2= mb_x + (i &1) - 1;
598
int mb_y2= mb_y + (i>>1) - 1;
599
int x= block_w*mb_x2 + block_w/2;
600
int y= block_w*mb_y2 + block_w/2;
602
add_yblock(s, 0, NULL, dst + ((i&1)+(i>>1)*obmc_stride)*block_w, NULL, obmc,
603
x, y, block_w, block_w, w, h, obmc_stride, ref_stride, obmc_stride, mb_x2, mb_y2, 0, 0, plane_index);
605
for(y2= FFMAX(y, 0); y2<FFMIN(h, y+block_w); y2++){
606
for(x2= FFMAX(x, 0); x2<FFMIN(w, x+block_w); x2++){
607
int index= x2-(block_w*mb_x - block_w/2) + (y2-(block_w*mb_y - block_w/2))*obmc_stride;
608
int obmc_v= obmc[index];
610
if(y<0) obmc_v += obmc[index + block_w*obmc_stride];
611
if(x<0) obmc_v += obmc[index + block_w];
612
if(y+block_w>h) obmc_v += obmc[index - block_w*obmc_stride];
613
if(x+block_w>w) obmc_v += obmc[index - block_w];
614
//FIXME precalculate this or simplify it somehow else
616
d = -dst[index] + (1<<(FRAC_BITS-1));
618
ab += (src[x2 + y2*ref_stride] - (d>>FRAC_BITS)) * obmc_v;
619
aa += obmc_v * obmc_v; //FIXME precalculate this
625
return av_clip(((ab<<LOG2_OBMC_MAX) + aa/2)/aa, 0, 255); //FIXME we should not need clipping
628
static inline int get_block_bits(SnowContext *s, int x, int y, int w){
629
const int b_stride = s->b_width << s->block_max_depth;
630
const int b_height = s->b_height<< s->block_max_depth;
631
int index= x + y*b_stride;
632
const BlockNode *b = &s->block[index];
633
const BlockNode *left = x ? &s->block[index-1] : &null_block;
634
const BlockNode *top = y ? &s->block[index-b_stride] : &null_block;
635
const BlockNode *tl = y && x ? &s->block[index-b_stride-1] : left;
636
const BlockNode *tr = y && x+w<b_stride ? &s->block[index-b_stride+w] : tl;
638
// int mx_context= av_log2(2*FFABS(left->mx - top->mx));
639
// int my_context= av_log2(2*FFABS(left->my - top->my));
641
if(x<0 || x>=b_stride || y>=b_height)
650
//FIXME try accurate rate
651
//FIXME intra and inter predictors if surrounding blocks are not the same type
652
if(b->type & BLOCK_INTRA){
653
return 3+2*( av_log2(2*FFABS(left->color[0] - b->color[0]))
654
+ av_log2(2*FFABS(left->color[1] - b->color[1]))
655
+ av_log2(2*FFABS(left->color[2] - b->color[2])));
657
pred_mv(s, &dmx, &dmy, b->ref, left, top, tr);
660
return 2*(1 + av_log2(2*FFABS(dmx)) //FIXME kill the 2* can be merged in lambda
661
+ av_log2(2*FFABS(dmy))
662
+ av_log2(2*b->ref));
666
static int get_block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index, const uint8_t *obmc_edged){
667
Plane *p= &s->plane[plane_index];
668
const int block_size = MB_SIZE >> s->block_max_depth;
669
const int block_w = plane_index ? block_size/2 : block_size;
670
const int obmc_stride= plane_index ? block_size : 2*block_size;
671
const int ref_stride= s->current_picture.linesize[plane_index];
672
uint8_t *dst= s->current_picture.data[plane_index];
673
uint8_t *src= s-> input_picture.data[plane_index];
674
IDWTELEM *pred= (IDWTELEM*)s->m.obmc_scratchpad + plane_index*block_size*block_size*4;
675
uint8_t *cur = s->scratchbuf;
676
uint8_t tmp[ref_stride*(2*MB_SIZE+HTAPS_MAX-1)];
677
const int b_stride = s->b_width << s->block_max_depth;
678
const int b_height = s->b_height<< s->block_max_depth;
679
const int w= p->width;
680
const int h= p->height;
683
const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
684
int sx= block_w*mb_x - block_w/2;
685
int sy= block_w*mb_y - block_w/2;
686
int x0= FFMAX(0,-sx);
687
int y0= FFMAX(0,-sy);
688
int x1= FFMIN(block_w*2, w-sx);
689
int y1= FFMIN(block_w*2, h-sy);
692
ff_snow_pred_block(s, cur, tmp, ref_stride, sx, sy, block_w*2, block_w*2, &s->block[mb_x + mb_y*b_stride], plane_index, w, h);
694
for(y=y0; y<y1; y++){
695
const uint8_t *obmc1= obmc_edged + y*obmc_stride;
696
const IDWTELEM *pred1 = pred + y*obmc_stride;
697
uint8_t *cur1 = cur + y*ref_stride;
698
uint8_t *dst1 = dst + sx + (sy+y)*ref_stride;
699
for(x=x0; x<x1; x++){
700
#if FRAC_BITS >= LOG2_OBMC_MAX
701
int v = (cur1[x] * obmc1[x]) << (FRAC_BITS - LOG2_OBMC_MAX);
703
int v = (cur1[x] * obmc1[x] + (1<<(LOG2_OBMC_MAX - FRAC_BITS-1))) >> (LOG2_OBMC_MAX - FRAC_BITS);
705
v = (v + pred1[x]) >> FRAC_BITS;
706
if(v&(~255)) v= ~(v>>31);
711
/* copy the regions where obmc[] = (uint8_t)256 */
712
if(LOG2_OBMC_MAX == 8
713
&& (mb_x == 0 || mb_x == b_stride-1)
714
&& (mb_y == 0 || mb_y == b_height-1)){
724
memcpy(dst + sx+x0 + (sy+y)*ref_stride, cur + x0 + y*ref_stride, x1-x0);
728
/* FIXME rearrange dsputil to fit 32x32 cmp functions */
729
/* FIXME check alignment of the cmp wavelet vs the encoding wavelet */
730
/* FIXME cmps overlap but do not cover the wavelet's whole support.
731
* So improving the score of one block is not strictly guaranteed
732
* to improve the score of the whole frame, thus iterative motion
733
* estimation does not always converge. */
734
if(s->avctx->me_cmp == FF_CMP_W97)
735
distortion = ff_w97_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
736
else if(s->avctx->me_cmp == FF_CMP_W53)
737
distortion = ff_w53_32_c(&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, 32);
741
int off = sx+16*(i&1) + (sy+16*(i>>1))*ref_stride;
742
distortion += s->dsp.me_cmp[0](&s->m, src + off, dst + off, ref_stride, 16);
747
distortion = s->dsp.me_cmp[0](&s->m, src + sx + sy*ref_stride, dst + sx + sy*ref_stride, ref_stride, block_w*2);
756
rate += get_block_bits(s, mb_x + (i&1) - (i>>1), mb_y + (i>>1), 1);
758
if(mb_x == b_stride-2)
759
rate += get_block_bits(s, mb_x + 1, mb_y + 1, 1);
761
return distortion + rate*penalty_factor;
764
static int get_4block_rd(SnowContext *s, int mb_x, int mb_y, int plane_index){
766
Plane *p= &s->plane[plane_index];
767
const int block_size = MB_SIZE >> s->block_max_depth;
768
const int block_w = plane_index ? block_size/2 : block_size;
769
const uint8_t *obmc = plane_index ? obmc_tab[s->block_max_depth+1] : obmc_tab[s->block_max_depth];
770
const int obmc_stride= plane_index ? block_size : 2*block_size;
771
const int ref_stride= s->current_picture.linesize[plane_index];
772
uint8_t *dst= s->current_picture.data[plane_index];
773
uint8_t *src= s-> input_picture.data[plane_index];
774
//FIXME zero_dst is const but add_yblock changes dst if add is 0 (this is never the case for dst=zero_dst
775
// const has only been removed from zero_dst to suppress a warning
776
static IDWTELEM zero_dst[4096]; //FIXME
777
const int b_stride = s->b_width << s->block_max_depth;
778
const int w= p->width;
779
const int h= p->height;
782
const int penalty_factor= get_penalty_factor(s->lambda, s->lambda2, s->avctx->me_cmp);
785
int mb_x2= mb_x + (i%3) - 1;
786
int mb_y2= mb_y + (i/3) - 1;
787
int x= block_w*mb_x2 + block_w/2;
788
int y= block_w*mb_y2 + block_w/2;
790
add_yblock(s, 0, NULL, zero_dst, dst, obmc,
791
x, y, block_w, block_w, w, h, /*dst_stride*/0, ref_stride, obmc_stride, mb_x2, mb_y2, 1, 1, plane_index);
793
//FIXME find a cleaner/simpler way to skip the outside stuff
794
for(y2= y; y2<0; y2++)
795
memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
796
for(y2= h; y2<y+block_w; y2++)
797
memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, block_w);
799
for(y2= y; y2<y+block_w; y2++)
800
memcpy(dst + x + y2*ref_stride, src + x + y2*ref_stride, -x);
803
for(y2= y; y2<y+block_w; y2++)
804
memcpy(dst + w + y2*ref_stride, src + w + y2*ref_stride, x+block_w - w);
807
assert(block_w== 8 || block_w==16);
808
distortion += s->dsp.me_cmp[block_w==8](&s->m, src + x + y*ref_stride, dst + x + y*ref_stride, ref_stride, block_w);
812
BlockNode *b= &s->block[mb_x+mb_y*b_stride];
813
int merged= same_block(b,b+1) && same_block(b,b+b_stride) && same_block(b,b+b_stride+1);
821
rate = get_block_bits(s, mb_x, mb_y, 2);
822
for(i=merged?4:0; i<9; i++){
823
static const int dxy[9][2] = {{0,0},{1,0},{0,1},{1,1},{2,0},{2,1},{-1,2},{0,2},{1,2}};
824
rate += get_block_bits(s, mb_x + dxy[i][0], mb_y + dxy[i][1], 1);
827
return distortion + rate*penalty_factor;
830
static int encode_subband_c0run(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
831
const int w= b->width;
832
const int h= b->height;
844
int /*ll=0, */l=0, lt=0, t=0, rt=0;
845
v= src[x + y*stride];
848
t= src[x + (y-1)*stride];
850
lt= src[x - 1 + (y-1)*stride];
853
rt= src[x + 1 + (y-1)*stride];
857
l= src[x - 1 + y*stride];
859
if(orientation==1) ll= src[y + (x-2)*stride];
860
else ll= src[x - 2 + y*stride];
866
if(px<b->parent->width && py<b->parent->height)
867
p= parent[px + py*2*stride];
869
if(!(/*ll|*/l|lt|t|rt|p)){
871
runs[run_index++]= run;
879
max_index= run_index;
880
runs[run_index++]= run;
882
run= runs[run_index++];
884
put_symbol2(&s->c, b->state[30], max_index, 0);
885
if(run_index <= max_index)
886
put_symbol2(&s->c, b->state[1], run, 3);
889
if(s->c.bytestream_end - s->c.bytestream < w*40){
890
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
895
int /*ll=0, */l=0, lt=0, t=0, rt=0;
896
v= src[x + y*stride];
899
t= src[x + (y-1)*stride];
901
lt= src[x - 1 + (y-1)*stride];
904
rt= src[x + 1 + (y-1)*stride];
908
l= src[x - 1 + y*stride];
910
if(orientation==1) ll= src[y + (x-2)*stride];
911
else ll= src[x - 2 + y*stride];
917
if(px<b->parent->width && py<b->parent->height)
918
p= parent[px + py*2*stride];
920
if(/*ll|*/l|lt|t|rt|p){
921
int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
923
put_rac(&s->c, &b->state[0][context], !!v);
926
run= runs[run_index++];
928
if(run_index <= max_index)
929
put_symbol2(&s->c, b->state[1], run, 3);
937
int context= av_log2(/*FFABS(ll) + */3*FFABS(l) + FFABS(lt) + 2*FFABS(t) + FFABS(rt) + FFABS(p));
938
int l2= 2*FFABS(l) + (l<0);
939
int t2= 2*FFABS(t) + (t<0);
941
put_symbol2(&s->c, b->state[context + 2], FFABS(v)-1, context-4);
942
put_rac(&s->c, &b->state[0][16 + 1 + 3 + quant3bA[l2&0xFF] + 3*quant3bA[t2&0xFF]], v<0);
950
static int encode_subband(SnowContext *s, SubBand *b, IDWTELEM *src, IDWTELEM *parent, int stride, int orientation){
951
// encode_subband_qtree(s, b, src, parent, stride, orientation);
952
// encode_subband_z0run(s, b, src, parent, stride, orientation);
953
return encode_subband_c0run(s, b, src, parent, stride, orientation);
954
// encode_subband_dzr(s, b, src, parent, stride, orientation);
957
static av_always_inline int check_block(SnowContext *s, int mb_x, int mb_y, int p[3], int intra, const uint8_t *obmc_edged, int *best_rd){
958
const int b_stride= s->b_width << s->block_max_depth;
959
BlockNode *block= &s->block[mb_x + mb_y * b_stride];
960
BlockNode backup= *block;
964
assert(mb_x>=0 && mb_y>=0);
965
assert(mb_x<b_stride);
968
block->color[0] = p[0];
969
block->color[1] = p[1];
970
block->color[2] = p[2];
971
block->type |= BLOCK_INTRA;
973
index= (p[0] + 31*p[1]) & (ME_CACHE_SIZE-1);
974
value= s->me_cache_generation + (p[0]>>10) + (p[1]<<6) + (block->ref<<12);
975
if(s->me_cache[index] == value)
977
s->me_cache[index]= value;
981
block->type &= ~BLOCK_INTRA;
984
rd= get_block_rd(s, mb_x, mb_y, 0, obmc_edged);
996
/* special case for int[2] args we discard afterwards,
997
* fixes compilation problem with gcc 2.95 */
998
static av_always_inline int check_block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, const uint8_t *obmc_edged, int *best_rd){
1000
return check_block(s, mb_x, mb_y, p, 0, obmc_edged, best_rd);
1003
static av_always_inline int check_4block_inter(SnowContext *s, int mb_x, int mb_y, int p0, int p1, int ref, int *best_rd){
1004
const int b_stride= s->b_width << s->block_max_depth;
1005
BlockNode *block= &s->block[mb_x + mb_y * b_stride];
1006
BlockNode backup[4]= {block[0], block[1], block[b_stride], block[b_stride+1]};
1010
assert(mb_x>=0 && mb_y>=0);
1011
assert(mb_x<b_stride);
1012
assert(((mb_x|mb_y)&1) == 0);
1014
index= (p0 + 31*p1) & (ME_CACHE_SIZE-1);
1015
value= s->me_cache_generation + (p0>>10) + (p1<<6) + (block->ref<<12);
1016
if(s->me_cache[index] == value)
1018
s->me_cache[index]= value;
1023
block->type &= ~BLOCK_INTRA;
1024
block[1]= block[b_stride]= block[b_stride+1]= *block;
1026
rd= get_4block_rd(s, mb_x, mb_y, 0);
1033
block[0]= backup[0];
1034
block[1]= backup[1];
1035
block[b_stride]= backup[2];
1036
block[b_stride+1]= backup[3];
1041
static void iterative_me(SnowContext *s){
1042
int pass, mb_x, mb_y;
1043
const int b_width = s->b_width << s->block_max_depth;
1044
const int b_height= s->b_height << s->block_max_depth;
1045
const int b_stride= b_width;
1049
RangeCoder r = s->c;
1050
uint8_t state[sizeof(s->block_state)];
1051
memcpy(state, s->block_state, sizeof(s->block_state));
1052
for(mb_y= 0; mb_y<s->b_height; mb_y++)
1053
for(mb_x= 0; mb_x<s->b_width; mb_x++)
1054
encode_q_branch(s, 0, mb_x, mb_y);
1056
memcpy(s->block_state, state, sizeof(s->block_state));
1059
for(pass=0; pass<25; pass++){
1062
for(mb_y= 0; mb_y<b_height; mb_y++){
1063
for(mb_x= 0; mb_x<b_width; mb_x++){
1064
int dia_change, i, j, ref;
1065
int best_rd= INT_MAX, ref_rd;
1066
BlockNode backup, ref_b;
1067
const int index= mb_x + mb_y * b_stride;
1068
BlockNode *block= &s->block[index];
1069
BlockNode *tb = mb_y ? &s->block[index-b_stride ] : NULL;
1070
BlockNode *lb = mb_x ? &s->block[index -1] : NULL;
1071
BlockNode *rb = mb_x+1<b_width ? &s->block[index +1] : NULL;
1072
BlockNode *bb = mb_y+1<b_height ? &s->block[index+b_stride ] : NULL;
1073
BlockNode *tlb= mb_x && mb_y ? &s->block[index-b_stride-1] : NULL;
1074
BlockNode *trb= mb_x+1<b_width && mb_y ? &s->block[index-b_stride+1] : NULL;
1075
BlockNode *blb= mb_x && mb_y+1<b_height ? &s->block[index+b_stride-1] : NULL;
1076
BlockNode *brb= mb_x+1<b_width && mb_y+1<b_height ? &s->block[index+b_stride+1] : NULL;
1077
const int b_w= (MB_SIZE >> s->block_max_depth);
1078
uint8_t obmc_edged[b_w*2][b_w*2];
1080
if(pass && (block->type & BLOCK_OPT))
1082
block->type |= BLOCK_OPT;
1086
if(!s->me_cache_generation)
1087
memset(s->me_cache, 0, sizeof(s->me_cache));
1088
s->me_cache_generation += 1<<22;
1090
//FIXME precalculate
1093
memcpy(obmc_edged, obmc_tab[s->block_max_depth], b_w*b_w*4);
1095
for(y=0; y<b_w*2; y++)
1096
memset(obmc_edged[y], obmc_edged[y][0] + obmc_edged[y][b_w-1], b_w);
1097
if(mb_x==b_stride-1)
1098
for(y=0; y<b_w*2; y++)
1099
memset(obmc_edged[y]+b_w, obmc_edged[y][b_w] + obmc_edged[y][b_w*2-1], b_w);
1101
for(x=0; x<b_w*2; x++)
1102
obmc_edged[0][x] += obmc_edged[b_w-1][x];
1103
for(y=1; y<b_w; y++)
1104
memcpy(obmc_edged[y], obmc_edged[0], b_w*2);
1106
if(mb_y==b_height-1){
1107
for(x=0; x<b_w*2; x++)
1108
obmc_edged[b_w*2-1][x] += obmc_edged[b_w][x];
1109
for(y=b_w; y<b_w*2-1; y++)
1110
memcpy(obmc_edged[y], obmc_edged[b_w*2-1], b_w*2);
1114
//skip stuff outside the picture
1115
if(mb_x==0 || mb_y==0 || mb_x==b_width-1 || mb_y==b_height-1){
1116
uint8_t *src= s-> input_picture.data[0];
1117
uint8_t *dst= s->current_picture.data[0];
1118
const int stride= s->current_picture.linesize[0];
1119
const int block_w= MB_SIZE >> s->block_max_depth;
1120
const int sx= block_w*mb_x - block_w/2;
1121
const int sy= block_w*mb_y - block_w/2;
1122
const int w= s->plane[0].width;
1123
const int h= s->plane[0].height;
1127
memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
1128
for(y=h; y<sy+block_w*2; y++)
1129
memcpy(dst + sx + y*stride, src + sx + y*stride, block_w*2);
1131
for(y=sy; y<sy+block_w*2; y++)
1132
memcpy(dst + sx + y*stride, src + sx + y*stride, -sx);
1134
if(sx+block_w*2 > w){
1135
for(y=sy; y<sy+block_w*2; y++)
1136
memcpy(dst + w + y*stride, src + w + y*stride, sx+block_w*2 - w);
1140
// intra(black) = neighbors' contribution to the current block
1142
color[i]= get_dc(s, mb_x, mb_y, i);
1144
// get previous score (cannot be cached due to OBMC)
1145
if(pass > 0 && (block->type&BLOCK_INTRA)){
1146
int color0[3]= {block->color[0], block->color[1], block->color[2]};
1147
check_block(s, mb_x, mb_y, color0, 1, *obmc_edged, &best_rd);
1149
check_block_inter(s, mb_x, mb_y, block->mx, block->my, *obmc_edged, &best_rd);
1153
for(ref=0; ref < s->ref_frames; ref++){
1154
int16_t (*mvr)[2]= &s->ref_mvs[ref][index];
1155
if(s->ref_scores[ref][index] > s->ref_scores[ref_b.ref][index]*3/2) //FIXME tune threshold
1160
check_block_inter(s, mb_x, mb_y, mvr[0][0], mvr[0][1], *obmc_edged, &best_rd);
1161
check_block_inter(s, mb_x, mb_y, 0, 0, *obmc_edged, &best_rd);
1163
check_block_inter(s, mb_x, mb_y, mvr[-b_stride][0], mvr[-b_stride][1], *obmc_edged, &best_rd);
1165
check_block_inter(s, mb_x, mb_y, mvr[-1][0], mvr[-1][1], *obmc_edged, &best_rd);
1167
check_block_inter(s, mb_x, mb_y, mvr[1][0], mvr[1][1], *obmc_edged, &best_rd);
1169
check_block_inter(s, mb_x, mb_y, mvr[b_stride][0], mvr[b_stride][1], *obmc_edged, &best_rd);
1172
//FIXME avoid subpel interpolation / round to nearest integer
1175
for(i=0; i<FFMAX(s->avctx->dia_size, 1); i++){
1177
dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my+(4*j), *obmc_edged, &best_rd);
1178
dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my-(4*j), *obmc_edged, &best_rd);
1179
dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+4*(i-j), block->my-(4*j), *obmc_edged, &best_rd);
1180
dia_change |= check_block_inter(s, mb_x, mb_y, block->mx-4*(i-j), block->my+(4*j), *obmc_edged, &best_rd);
1186
static const int square[8][2]= {{+1, 0},{-1, 0},{ 0,+1},{ 0,-1},{+1,+1},{-1,-1},{+1,-1},{-1,+1},};
1189
dia_change |= check_block_inter(s, mb_x, mb_y, block->mx+square[i][0], block->my+square[i][1], *obmc_edged, &best_rd);
1191
//FIXME or try the standard 2 pass qpel or similar
1193
mvr[0][0]= block->mx;
1194
mvr[0][1]= block->my;
1195
if(ref_rd > best_rd){
1202
check_block(s, mb_x, mb_y, color, 1, *obmc_edged, &best_rd);
1203
//FIXME RD style color selection
1204
if(!same_block(block, &backup)){
1205
if(tb ) tb ->type &= ~BLOCK_OPT;
1206
if(lb ) lb ->type &= ~BLOCK_OPT;
1207
if(rb ) rb ->type &= ~BLOCK_OPT;
1208
if(bb ) bb ->type &= ~BLOCK_OPT;
1209
if(tlb) tlb->type &= ~BLOCK_OPT;
1210
if(trb) trb->type &= ~BLOCK_OPT;
1211
if(blb) blb->type &= ~BLOCK_OPT;
1212
if(brb) brb->type &= ~BLOCK_OPT;
1217
av_log(s->avctx, AV_LOG_ERROR, "pass:%d changed:%d\n", pass, change);
1222
if(s->block_max_depth == 1){
1224
for(mb_y= 0; mb_y<b_height; mb_y+=2){
1225
for(mb_x= 0; mb_x<b_width; mb_x+=2){
1227
int best_rd, init_rd;
1228
const int index= mb_x + mb_y * b_stride;
1231
b[0]= &s->block[index];
1233
b[2]= b[0]+b_stride;
1235
if(same_block(b[0], b[1]) &&
1236
same_block(b[0], b[2]) &&
1237
same_block(b[0], b[3]))
1240
if(!s->me_cache_generation)
1241
memset(s->me_cache, 0, sizeof(s->me_cache));
1242
s->me_cache_generation += 1<<22;
1244
init_rd= best_rd= get_4block_rd(s, mb_x, mb_y, 0);
1246
//FIXME more multiref search?
1247
check_4block_inter(s, mb_x, mb_y,
1248
(b[0]->mx + b[1]->mx + b[2]->mx + b[3]->mx + 2) >> 2,
1249
(b[0]->my + b[1]->my + b[2]->my + b[3]->my + 2) >> 2, 0, &best_rd);
1252
if(!(b[i]->type&BLOCK_INTRA))
1253
check_4block_inter(s, mb_x, mb_y, b[i]->mx, b[i]->my, b[i]->ref, &best_rd);
1255
if(init_rd != best_rd)
1259
av_log(s->avctx, AV_LOG_ERROR, "pass:4mv changed:%d\n", change*4);
1263
static void encode_blocks(SnowContext *s, int search){
1268
if(s->avctx->me_method == ME_ITER && !s->keyframe && search)
1272
if(s->c.bytestream_end - s->c.bytestream < w*MB_SIZE*MB_SIZE*3){ //FIXME nicer limit
1273
av_log(s->avctx, AV_LOG_ERROR, "encoded frame too large\n");
1277
if(s->avctx->me_method == ME_ITER || !search)
1278
encode_q_branch2(s, 0, x, y);
1280
encode_q_branch (s, 0, x, y);
1285
static void quantize(SnowContext *s, SubBand *b, IDWTELEM *dst, DWTELEM *src, int stride, int bias){
1286
const int w= b->width;
1287
const int h= b->height;
1288
const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
1289
const int qmul= qexp[qlog&(QROOT-1)]<<((qlog>>QSHIFT) + ENCODER_EXTRA_BITS);
1290
int x,y, thres1, thres2;
1292
if(s->qlog == LOSSLESS_QLOG){
1295
dst[x + y*stride]= src[x + y*stride];
1299
bias= bias ? 0 : (3*qmul)>>3;
1300
thres1= ((qmul - bias)>>QEXPSHIFT) - 1;
1306
int i= src[x + y*stride];
1308
if((unsigned)(i+thres1) > thres2){
1311
i/= qmul; //FIXME optimize
1312
dst[x + y*stride]= i;
1316
i/= qmul; //FIXME optimize
1317
dst[x + y*stride]= -i;
1320
dst[x + y*stride]= 0;
1326
int i= src[x + y*stride];
1328
if((unsigned)(i+thres1) > thres2){
1331
i= (i + bias) / qmul; //FIXME optimize
1332
dst[x + y*stride]= i;
1336
i= (i + bias) / qmul; //FIXME optimize
1337
dst[x + y*stride]= -i;
1340
dst[x + y*stride]= 0;
1346
static void dequantize(SnowContext *s, SubBand *b, IDWTELEM *src, int stride){
1347
const int w= b->width;
1348
const int h= b->height;
1349
const int qlog= av_clip(s->qlog + b->qlog, 0, QROOT*16);
1350
const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
1351
const int qadd= (s->qbias*qmul)>>QBIAS_SHIFT;
1354
if(s->qlog == LOSSLESS_QLOG) return;
1358
int i= src[x + y*stride];
1360
src[x + y*stride]= -((-i*qmul + qadd)>>(QEXPSHIFT)); //FIXME try different bias
1362
src[x + y*stride]= (( i*qmul + qadd)>>(QEXPSHIFT));
1368
static void decorrelate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
1369
const int w= b->width;
1370
const int h= b->height;
1373
for(y=h-1; y>=0; y--){
1374
for(x=w-1; x>=0; x--){
1375
int i= x + y*stride;
1379
if(y && x+1<w) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
1380
else src[i] -= src[i - 1];
1382
if(y) src[i] -= mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
1383
else src[i] -= src[i - 1];
1386
if(y) src[i] -= src[i - stride];
1392
static void correlate(SnowContext *s, SubBand *b, IDWTELEM *src, int stride, int inverse, int use_median){
1393
const int w= b->width;
1394
const int h= b->height;
1399
int i= x + y*stride;
1403
if(y && x+1<w) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - stride + 1]);
1404
else src[i] += src[i - 1];
1406
if(y) src[i] += mid_pred(src[i - 1], src[i - stride], src[i - 1] + src[i - stride] - src[i - 1 - stride]);
1407
else src[i] += src[i - 1];
1410
if(y) src[i] += src[i - stride];
1416
static void encode_qlogs(SnowContext *s){
1417
int plane_index, level, orientation;
1419
for(plane_index=0; plane_index<2; plane_index++){
1420
for(level=0; level<s->spatial_decomposition_count; level++){
1421
for(orientation=level ? 1:0; orientation<4; orientation++){
1422
if(orientation==2) continue;
1423
put_symbol(&s->c, s->header_state, s->plane[plane_index].band[level][orientation].qlog, 1);
1429
static void encode_header(SnowContext *s){
1433
memset(kstate, MID_STATE, sizeof(kstate));
1435
put_rac(&s->c, kstate, s->keyframe);
1436
if(s->keyframe || s->always_reset){
1437
ff_snow_reset_contexts(s);
1438
s->last_spatial_decomposition_type=
1442
s->last_block_max_depth= 0;
1443
for(plane_index=0; plane_index<2; plane_index++){
1444
Plane *p= &s->plane[plane_index];
1447
memset(p->last_hcoeff, 0, sizeof(p->last_hcoeff));
1451
put_symbol(&s->c, s->header_state, s->version, 0);
1452
put_rac(&s->c, s->header_state, s->always_reset);
1453
put_symbol(&s->c, s->header_state, s->temporal_decomposition_type, 0);
1454
put_symbol(&s->c, s->header_state, s->temporal_decomposition_count, 0);
1455
put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
1456
put_symbol(&s->c, s->header_state, s->colorspace_type, 0);
1457
put_symbol(&s->c, s->header_state, s->chroma_h_shift, 0);
1458
put_symbol(&s->c, s->header_state, s->chroma_v_shift, 0);
1459
put_rac(&s->c, s->header_state, s->spatial_scalability);
1460
// put_rac(&s->c, s->header_state, s->rate_scalability);
1461
put_symbol(&s->c, s->header_state, s->max_ref_frames-1, 0);
1468
for(plane_index=0; plane_index<2; plane_index++){
1469
Plane *p= &s->plane[plane_index];
1470
update_mc |= p->last_htaps != p->htaps;
1471
update_mc |= p->last_diag_mc != p->diag_mc;
1472
update_mc |= !!memcmp(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
1474
put_rac(&s->c, s->header_state, update_mc);
1476
for(plane_index=0; plane_index<2; plane_index++){
1477
Plane *p= &s->plane[plane_index];
1478
put_rac(&s->c, s->header_state, p->diag_mc);
1479
put_symbol(&s->c, s->header_state, p->htaps/2-1, 0);
1480
for(i= p->htaps/2; i; i--)
1481
put_symbol(&s->c, s->header_state, FFABS(p->hcoeff[i]), 0);
1484
if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
1485
put_rac(&s->c, s->header_state, 1);
1486
put_symbol(&s->c, s->header_state, s->spatial_decomposition_count, 0);
1489
put_rac(&s->c, s->header_state, 0);
1492
put_symbol(&s->c, s->header_state, s->spatial_decomposition_type - s->last_spatial_decomposition_type, 1);
1493
put_symbol(&s->c, s->header_state, s->qlog - s->last_qlog , 1);
1494
put_symbol(&s->c, s->header_state, s->mv_scale - s->last_mv_scale, 1);
1495
put_symbol(&s->c, s->header_state, s->qbias - s->last_qbias , 1);
1496
put_symbol(&s->c, s->header_state, s->block_max_depth - s->last_block_max_depth, 1);
1500
static void update_last_header_values(SnowContext *s){
1504
for(plane_index=0; plane_index<2; plane_index++){
1505
Plane *p= &s->plane[plane_index];
1506
p->last_diag_mc= p->diag_mc;
1507
p->last_htaps = p->htaps;
1508
memcpy(p->last_hcoeff, p->hcoeff, sizeof(p->hcoeff));
1512
s->last_spatial_decomposition_type = s->spatial_decomposition_type;
1513
s->last_qlog = s->qlog;
1514
s->last_qbias = s->qbias;
1515
s->last_mv_scale = s->mv_scale;
1516
s->last_block_max_depth = s->block_max_depth;
1517
s->last_spatial_decomposition_count = s->spatial_decomposition_count;
1520
static int qscale2qlog(int qscale){
1521
return rint(QROOT*log(qscale / (float)FF_QP2LAMBDA)/log(2))
1522
+ 61*QROOT/8; ///< 64 > 60
1525
static int ratecontrol_1pass(SnowContext *s, AVFrame *pict)
1527
/* Estimate the frame's complexity as a sum of weighted dwt coefficients.
1528
* FIXME we know exact mv bits at this point,
1529
* but ratecontrol isn't set up to include them. */
1530
uint32_t coef_sum= 0;
1531
int level, orientation, delta_qlog;
1533
for(level=0; level<s->spatial_decomposition_count; level++){
1534
for(orientation=level ? 1 : 0; orientation<4; orientation++){
1535
SubBand *b= &s->plane[0].band[level][orientation];
1536
IDWTELEM *buf= b->ibuf;
1537
const int w= b->width;
1538
const int h= b->height;
1539
const int stride= b->stride;
1540
const int qlog= av_clip(2*QROOT + b->qlog, 0, QROOT*16);
1541
const int qmul= qexp[qlog&(QROOT-1)]<<(qlog>>QSHIFT);
1542
const int qdiv= (1<<16)/qmul;
1544
//FIXME this is ugly
1547
buf[x+y*stride]= b->buf[x+y*stride];
1549
decorrelate(s, b, buf, stride, 1, 0);
1552
coef_sum+= abs(buf[x+y*stride]) * qdiv >> 16;
1556
/* ugly, ratecontrol just takes a sqrt again */
1557
coef_sum = (uint64_t)coef_sum * coef_sum >> 16;
1558
assert(coef_sum < INT_MAX);
1560
if(pict->pict_type == AV_PICTURE_TYPE_I){
1561
s->m.current_picture.mb_var_sum= coef_sum;
1562
s->m.current_picture.mc_mb_var_sum= 0;
1564
s->m.current_picture.mc_mb_var_sum= coef_sum;
1565
s->m.current_picture.mb_var_sum= 0;
1568
pict->quality= ff_rate_estimate_qscale(&s->m, 1);
1569
if (pict->quality < 0)
1571
s->lambda= pict->quality * 3/2;
1572
delta_qlog= qscale2qlog(pict->quality) - s->qlog;
1573
s->qlog+= delta_qlog;
1577
static void calculate_visual_weight(SnowContext *s, Plane *p){
1578
int width = p->width;
1579
int height= p->height;
1580
int level, orientation, x, y;
1582
for(level=0; level<s->spatial_decomposition_count; level++){
1583
for(orientation=level ? 1 : 0; orientation<4; orientation++){
1584
SubBand *b= &p->band[level][orientation];
1585
IDWTELEM *ibuf= b->ibuf;
1588
memset(s->spatial_idwt_buffer, 0, sizeof(*s->spatial_idwt_buffer)*width*height);
1589
ibuf[b->width/2 + b->height/2*b->stride]= 256*16;
1590
ff_spatial_idwt(s->spatial_idwt_buffer, width, height, width, s->spatial_decomposition_type, s->spatial_decomposition_count);
1591
for(y=0; y<height; y++){
1592
for(x=0; x<width; x++){
1593
int64_t d= s->spatial_idwt_buffer[x + y*width]*16;
1598
b->qlog= (int)(log(352256.0/sqrt(error)) / log(pow(2.0, 1.0/QROOT))+0.5);
1603
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
1604
SnowContext *s = avctx->priv_data;
1605
RangeCoder * const c= &s->c;
1606
AVFrame *pict = data;
1607
const int width= s->avctx->width;
1608
const int height= s->avctx->height;
1609
int level, orientation, plane_index, i, y;
1610
uint8_t rc_header_bak[sizeof(s->header_state)];
1611
uint8_t rc_block_bak[sizeof(s->block_state)];
1613
ff_init_range_encoder(c, buf, buf_size);
1614
ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
1618
for(y=0; y<(height>>shift); y++)
1619
memcpy(&s->input_picture.data[i][y * s->input_picture.linesize[i]],
1620
&pict->data[i][y * pict->linesize[i]],
1623
s->new_picture = *pict;
1625
s->m.picture_number= avctx->frame_number;
1626
if(avctx->flags&CODEC_FLAG_PASS2){
1628
pict->pict_type= s->m.rc_context.entry[avctx->frame_number].new_pict_type;
1629
s->keyframe= pict->pict_type==AV_PICTURE_TYPE_I;
1630
if(!(avctx->flags&CODEC_FLAG_QSCALE)) {
1631
pict->quality= ff_rate_estimate_qscale(&s->m, 0);
1632
if (pict->quality < 0)
1636
s->keyframe= avctx->gop_size==0 || avctx->frame_number % avctx->gop_size == 0;
1638
pict->pict_type= s->keyframe ? AV_PICTURE_TYPE_I : AV_PICTURE_TYPE_P;
1641
if(s->pass1_rc && avctx->frame_number == 0)
1642
pict->quality= 2*FF_QP2LAMBDA;
1644
s->qlog= qscale2qlog(pict->quality);
1645
s->lambda = pict->quality * 3/2;
1647
if(s->qlog < 0 || (!pict->quality && (avctx->flags & CODEC_FLAG_QSCALE))){
1648
s->qlog= LOSSLESS_QLOG;
1650
}//else keep previous frame's qlog until after motion estimation
1652
ff_snow_frame_start(s);
1654
s->m.current_picture_ptr= &s->m.current_picture;
1655
s->m.last_picture.f.pts = s->m.current_picture.f.pts;
1656
s->m.current_picture.f.pts = pict->pts;
1657
if(pict->pict_type == AV_PICTURE_TYPE_P){
1658
int block_width = (width +15)>>4;
1659
int block_height= (height+15)>>4;
1660
int stride= s->current_picture.linesize[0];
1662
assert(s->current_picture.data[0]);
1663
assert(s->last_picture[0].data[0]);
1665
s->m.avctx= s->avctx;
1666
s->m.current_picture.f.data[0] = s->current_picture.data[0];
1667
s->m. last_picture.f.data[0] = s->last_picture[0].data[0];
1668
s->m. new_picture.f.data[0] = s-> input_picture.data[0];
1669
s->m. last_picture_ptr= &s->m. last_picture;
1671
s->m. last_picture.f.linesize[0] =
1672
s->m. new_picture.f.linesize[0] =
1673
s->m.current_picture.f.linesize[0] = stride;
1674
s->m.uvlinesize= s->current_picture.linesize[1];
1676
s->m.height= height;
1677
s->m.mb_width = block_width;
1678
s->m.mb_height= block_height;
1679
s->m.mb_stride= s->m.mb_width+1;
1680
s->m.b8_stride= 2*s->m.mb_width+1;
1682
s->m.pict_type= pict->pict_type;
1683
s->m.me_method= s->avctx->me_method;
1684
s->m.me.scene_change_score=0;
1685
s->m.flags= s->avctx->flags;
1686
s->m.quarter_sample= (s->avctx->flags & CODEC_FLAG_QPEL)!=0;
1687
s->m.out_format= FMT_H263;
1688
s->m.unrestricted_mv= 1;
1690
s->m.lambda = s->lambda;
1691
s->m.qscale= (s->m.lambda*139 + FF_LAMBDA_SCALE*64) >> (FF_LAMBDA_SHIFT + 7);
1692
s->lambda2= s->m.lambda2= (s->m.lambda*s->m.lambda + FF_LAMBDA_SCALE/2) >> FF_LAMBDA_SHIFT;
1694
s->m.dsp= s->dsp; //move
1700
memcpy(rc_header_bak, s->header_state, sizeof(s->header_state));
1701
memcpy(rc_block_bak, s->block_state, sizeof(s->block_state));
1706
if(pict->pict_type == AV_PICTURE_TYPE_I)
1707
s->spatial_decomposition_count= 5;
1709
s->spatial_decomposition_count= 5;
1711
s->m.pict_type = pict->pict_type;
1712
s->qbias= pict->pict_type == AV_PICTURE_TYPE_P ? 2 : 0;
1714
ff_snow_common_init_after_header(avctx);
1716
if(s->last_spatial_decomposition_count != s->spatial_decomposition_count){
1717
for(plane_index=0; plane_index<3; plane_index++){
1718
calculate_visual_weight(s, &s->plane[plane_index]);
1723
s->m.misc_bits = 8*(s->c.bytestream - s->c.bytestream_start);
1724
encode_blocks(s, 1);
1725
s->m.mv_bits = 8*(s->c.bytestream - s->c.bytestream_start) - s->m.misc_bits;
1727
for(plane_index=0; plane_index<3; plane_index++){
1728
Plane *p= &s->plane[plane_index];
1732
// int bits= put_bits_count(&s->c.pb);
1734
if (!s->memc_only) {
1736
if(pict->data[plane_index]) //FIXME gray hack
1739
s->spatial_idwt_buffer[y*w + x]= pict->data[plane_index][y*pict->linesize[plane_index] + x]<<FRAC_BITS;
1742
predict_plane(s, s->spatial_idwt_buffer, plane_index, 0);
1745
&& pict->pict_type == AV_PICTURE_TYPE_P
1746
&& !(avctx->flags&CODEC_FLAG_PASS2)
1747
&& s->m.me.scene_change_score > s->avctx->scenechange_threshold){
1748
ff_init_range_encoder(c, buf, buf_size);
1749
ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);
1750
pict->pict_type= AV_PICTURE_TYPE_I;
1752
s->current_picture.key_frame=1;
1756
if(s->qlog == LOSSLESS_QLOG){
1759
s->spatial_dwt_buffer[y*w + x]= (s->spatial_idwt_buffer[y*w + x] + (1<<(FRAC_BITS-1))-1)>>FRAC_BITS;
1765
s->spatial_dwt_buffer[y*w + x]=s->spatial_idwt_buffer[y*w + x]<<ENCODER_EXTRA_BITS;
1771
dwt_quantize(s, p, s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type);
1773
ff_spatial_dwt(s->spatial_dwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
1775
if(s->pass1_rc && plane_index==0){
1776
int delta_qlog = ratecontrol_1pass(s, pict);
1777
if (delta_qlog <= INT_MIN)
1780
//reordering qlog in the bitstream would eliminate this reset
1781
ff_init_range_encoder(c, buf, buf_size);
1782
memcpy(s->header_state, rc_header_bak, sizeof(s->header_state));
1783
memcpy(s->block_state, rc_block_bak, sizeof(s->block_state));
1785
encode_blocks(s, 0);
1789
for(level=0; level<s->spatial_decomposition_count; level++){
1790
for(orientation=level ? 1 : 0; orientation<4; orientation++){
1791
SubBand *b= &p->band[level][orientation];
1794
quantize(s, b, b->ibuf, b->buf, b->stride, s->qbias);
1796
decorrelate(s, b, b->ibuf, b->stride, pict->pict_type == AV_PICTURE_TYPE_P, 0);
1797
encode_subband(s, b, b->ibuf, b->parent ? b->parent->ibuf : NULL, b->stride, orientation);
1798
assert(b->parent==NULL || b->parent->stride == b->stride*2);
1800
correlate(s, b, b->ibuf, b->stride, 1, 0);
1804
for(level=0; level<s->spatial_decomposition_count; level++){
1805
for(orientation=level ? 1 : 0; orientation<4; orientation++){
1806
SubBand *b= &p->band[level][orientation];
1808
dequantize(s, b, b->ibuf, b->stride);
1812
ff_spatial_idwt(s->spatial_idwt_buffer, w, h, w, s->spatial_decomposition_type, s->spatial_decomposition_count);
1813
if(s->qlog == LOSSLESS_QLOG){
1816
s->spatial_idwt_buffer[y*w + x]<<=FRAC_BITS;
1820
predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
1823
if(pict->pict_type == AV_PICTURE_TYPE_I){
1826
s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x]=
1827
pict->data[plane_index][y*pict->linesize[plane_index] + x];
1831
memset(s->spatial_idwt_buffer, 0, sizeof(IDWTELEM)*w*h);
1832
predict_plane(s, s->spatial_idwt_buffer, plane_index, 1);
1835
if(s->avctx->flags&CODEC_FLAG_PSNR){
1838
if(pict->data[plane_index]) //FIXME gray hack
1841
int d= s->current_picture.data[plane_index][y*s->current_picture.linesize[plane_index] + x] - pict->data[plane_index][y*pict->linesize[plane_index] + x];
1845
s->avctx->error[plane_index] += error;
1846
s->current_picture.error[plane_index] = error;
1851
update_last_header_values(s);
1853
ff_snow_release_buffer(avctx);
1855
s->current_picture.coded_picture_number = avctx->frame_number;
1856
s->current_picture.pict_type = pict->pict_type;
1857
s->current_picture.quality = pict->quality;
1858
s->m.frame_bits = 8*(s->c.bytestream - s->c.bytestream_start);
1859
s->m.p_tex_bits = s->m.frame_bits - s->m.misc_bits - s->m.mv_bits;
1860
s->m.current_picture.f.display_picture_number =
1861
s->m.current_picture.f.coded_picture_number = avctx->frame_number;
1862
s->m.current_picture.f.quality = pict->quality;
1863
s->m.total_bits += 8*(s->c.bytestream - s->c.bytestream_start);
1865
if (ff_rate_estimate_qscale(&s->m, 0) < 0)
1867
if(avctx->flags&CODEC_FLAG_PASS1)
1868
ff_write_pass1_stats(&s->m);
1869
s->m.last_pict_type = s->m.pict_type;
1870
avctx->frame_bits = s->m.frame_bits;
1871
avctx->mv_bits = s->m.mv_bits;
1872
avctx->misc_bits = s->m.misc_bits;
1873
avctx->p_tex_bits = s->m.p_tex_bits;
1877
return ff_rac_terminate(c);
1880
static av_cold int encode_end(AVCodecContext *avctx)
1882
SnowContext *s = avctx->priv_data;
1884
ff_snow_common_end(s);
1885
if (s->input_picture.data[0])
1886
avctx->release_buffer(avctx, &s->input_picture);
1887
av_free(avctx->stats_out);
1892
#define OFFSET(x) offsetof(SnowContext, x)
1893
#define VE AV_OPT_FLAG_VIDEO_PARAM | AV_OPT_FLAG_ENCODING_PARAM
1894
static const AVOption options[] = {
1895
{ "memc_only", "Only do ME/MC (I frames -> ref, P frame -> ME+MC).", OFFSET(memc_only), AV_OPT_TYPE_INT, { 0 }, 0, 1, VE },
1899
static const AVClass snowenc_class = {
1900
.class_name = "snow encoder",
1901
.item_name = av_default_item_name,
1903
.version = LIBAVUTIL_VERSION_INT,
1906
AVCodec ff_snow_encoder = {
1908
.type = AVMEDIA_TYPE_VIDEO,
1909
.id = CODEC_ID_SNOW,
1910
.priv_data_size = sizeof(SnowContext),
1911
.init = encode_init,
1912
.encode = encode_frame,
1913
.close = encode_end,
1914
.long_name = NULL_IF_CONFIG_SMALL("Snow"),
1915
.priv_class = &snowenc_class,
added
removed
ffmpeg/libavcodec/snowenc.c
