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FFmpeg/libavcodec/snow.c

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/*
* Copyright (C) 2004 Michael Niedermayer <michaelni@gmx.at>
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "libavutil/intmath.h"
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "avcodec.h"
#include "dsputil.h"
#include "dwt.h"
#include "snow.h"
#include "snowdata.h"
#include "rangecoder.h"
#include "mathops.h"
#include "h263.h"
#undef NDEBUG
#include <assert.h>
void ff_snow_inner_add_yblock(const uint8_t *obmc, const int obmc_stride, uint8_t * * block, int b_w, int b_h,
int src_x, int src_y, int src_stride, slice_buffer * sb, int add, uint8_t * dst8){
int y, x;
IDWTELEM * dst;
for(y=0; y<b_h; y++){
//FIXME ugly misuse of obmc_stride
const uint8_t *obmc1= obmc + y*obmc_stride;
const uint8_t *obmc2= obmc1+ (obmc_stride>>1);
const uint8_t *obmc3= obmc1+ obmc_stride*(obmc_stride>>1);
const uint8_t *obmc4= obmc3+ (obmc_stride>>1);
dst = slice_buffer_get_line(sb, src_y + y);
for(x=0; x<b_w; x++){
int v= obmc1[x] * block[3][x + y*src_stride]
+obmc2[x] * block[2][x + y*src_stride]
+obmc3[x] * block[1][x + y*src_stride]
+obmc4[x] * block[0][x + y*src_stride];
v <<= 8 - LOG2_OBMC_MAX;
if(FRAC_BITS != 8){
v >>= 8 - FRAC_BITS;
}
if(add){
v += dst[x + src_x];
v = (v + (1<<(FRAC_BITS-1))) >> FRAC_BITS;
if(v&(~255)) v= ~(v>>31);
dst8[x + y*src_stride] = v;
}else{
dst[x + src_x] -= v;
}
}
}
}
void ff_snow_reset_contexts(SnowContext *s){ //FIXME better initial contexts
int plane_index, level, orientation;
for(plane_index=0; plane_index<3; plane_index++){
for(level=0; level<MAX_DECOMPOSITIONS; level++){
for(orientation=level ? 1:0; orientation<4; orientation++){
memset(s->plane[plane_index].band[level][orientation].state, MID_STATE, sizeof(s->plane[plane_index].band[level][orientation].state));
}
}
}
memset(s->header_state, MID_STATE, sizeof(s->header_state));
memset(s->block_state, MID_STATE, sizeof(s->block_state));
}
int ff_snow_alloc_blocks(SnowContext *s){
int w= -((-s->avctx->width )>>LOG2_MB_SIZE);
int h= -((-s->avctx->height)>>LOG2_MB_SIZE);
s->b_width = w;
s->b_height= h;
av_free(s->block);
s->block= av_mallocz(w * h * sizeof(BlockNode) << (s->block_max_depth*2));
return 0;
}
static void init_qexp(void){
int i;
double v=128;
for(i=0; i<QROOT; i++){
ff_qexp[i]= lrintf(v);
v *= pow(2, 1.0 / QROOT);
}
}
static void mc_block(Plane *p, uint8_t *dst, const uint8_t *src, int stride, int b_w, int b_h, int dx, int dy){
static const uint8_t weight[64]={
8,7,6,5,4,3,2,1,
7,7,0,0,0,0,0,1,
6,0,6,0,0,0,2,0,
5,0,0,5,0,3,0,0,
4,0,0,0,4,0,0,0,
3,0,0,5,0,3,0,0,
2,0,6,0,0,0,2,0,
1,7,0,0,0,0,0,1,
};
static const uint8_t brane[256]={
0x00,0x01,0x01,0x01,0x01,0x01,0x01,0x01,0x11,0x12,0x12,0x12,0x12,0x12,0x12,0x12,
0x04,0x05,0xcc,0xcc,0xcc,0xcc,0xcc,0x41,0x15,0x16,0xcc,0xcc,0xcc,0xcc,0xcc,0x52,
0x04,0xcc,0x05,0xcc,0xcc,0xcc,0x41,0xcc,0x15,0xcc,0x16,0xcc,0xcc,0xcc,0x52,0xcc,
0x04,0xcc,0xcc,0x05,0xcc,0x41,0xcc,0xcc,0x15,0xcc,0xcc,0x16,0xcc,0x52,0xcc,0xcc,
0x04,0xcc,0xcc,0xcc,0x41,0xcc,0xcc,0xcc,0x15,0xcc,0xcc,0xcc,0x16,0xcc,0xcc,0xcc,
0x04,0xcc,0xcc,0x41,0xcc,0x05,0xcc,0xcc,0x15,0xcc,0xcc,0x52,0xcc,0x16,0xcc,0xcc,
0x04,0xcc,0x41,0xcc,0xcc,0xcc,0x05,0xcc,0x15,0xcc,0x52,0xcc,0xcc,0xcc,0x16,0xcc,
0x04,0x41,0xcc,0xcc,0xcc,0xcc,0xcc,0x05,0x15,0x52,0xcc,0xcc,0xcc,0xcc,0xcc,0x16,
0x44,0x45,0x45,0x45,0x45,0x45,0x45,0x45,0x55,0x56,0x56,0x56,0x56,0x56,0x56,0x56,
0x48,0x49,0xcc,0xcc,0xcc,0xcc,0xcc,0x85,0x59,0x5A,0xcc,0xcc,0xcc,0xcc,0xcc,0x96,
0x48,0xcc,0x49,0xcc,0xcc,0xcc,0x85,0xcc,0x59,0xcc,0x5A,0xcc,0xcc,0xcc,0x96,0xcc,
0x48,0xcc,0xcc,0x49,0xcc,0x85,0xcc,0xcc,0x59,0xcc,0xcc,0x5A,0xcc,0x96,0xcc,0xcc,
0x48,0xcc,0xcc,0xcc,0x49,0xcc,0xcc,0xcc,0x59,0xcc,0xcc,0xcc,0x96,0xcc,0xcc,0xcc,
0x48,0xcc,0xcc,0x85,0xcc,0x49,0xcc,0xcc,0x59,0xcc,0xcc,0x96,0xcc,0x5A,0xcc,0xcc,
0x48,0xcc,0x85,0xcc,0xcc,0xcc,0x49,0xcc,0x59,0xcc,0x96,0xcc,0xcc,0xcc,0x5A,0xcc,
0x48,0x85,0xcc,0xcc,0xcc,0xcc,0xcc,0x49,0x59,0x96,0xcc,0xcc,0xcc,0xcc,0xcc,0x5A,
};
static const uint8_t needs[16]={
0,1,0,0,
2,4,2,0,
0,1,0,0,
15
};
int x, y, b, r, l;
int16_t tmpIt [64*(32+HTAPS_MAX)];
uint8_t tmp2t[3][stride*(32+HTAPS_MAX)];
int16_t *tmpI= tmpIt;
uint8_t *tmp2= tmp2t[0];
const uint8_t *hpel[11];
assert(dx<16 && dy<16);
r= brane[dx + 16*dy]&15;
l= brane[dx + 16*dy]>>4;
b= needs[l] | needs[r];
if(p && !p->diag_mc)
b= 15;
if(b&5){
for(y=0; y < b_h+HTAPS_MAX-1; y++){
for(x=0; x < b_w; x++){
int a_1=src[x + HTAPS_MAX/2-4];
int a0= src[x + HTAPS_MAX/2-3];
int a1= src[x + HTAPS_MAX/2-2];
int a2= src[x + HTAPS_MAX/2-1];
int a3= src[x + HTAPS_MAX/2+0];
int a4= src[x + HTAPS_MAX/2+1];
int a5= src[x + HTAPS_MAX/2+2];
int a6= src[x + HTAPS_MAX/2+3];
int am=0;
if(!p || p->fast_mc){
am= 20*(a2+a3) - 5*(a1+a4) + (a0+a5);
tmpI[x]= am;
am= (am+16)>>5;
}else{
am= p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6);
tmpI[x]= am;
am= (am+32)>>6;
}
if(am&(~255)) am= ~(am>>31);
tmp2[x]= am;
}
tmpI+= 64;
tmp2+= stride;
src += stride;
}
src -= stride*y;
}
src += HTAPS_MAX/2 - 1;
tmp2= tmp2t[1];
if(b&2){
for(y=0; y < b_h; y++){
for(x=0; x < b_w+1; x++){
int a_1=src[x + (HTAPS_MAX/2-4)*stride];
int a0= src[x + (HTAPS_MAX/2-3)*stride];
int a1= src[x + (HTAPS_MAX/2-2)*stride];
int a2= src[x + (HTAPS_MAX/2-1)*stride];
int a3= src[x + (HTAPS_MAX/2+0)*stride];
int a4= src[x + (HTAPS_MAX/2+1)*stride];
int a5= src[x + (HTAPS_MAX/2+2)*stride];
int a6= src[x + (HTAPS_MAX/2+3)*stride];
int am=0;
if(!p || p->fast_mc)
am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 16)>>5;
else
am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 32)>>6;
if(am&(~255)) am= ~(am>>31);
tmp2[x]= am;
}
src += stride;
tmp2+= stride;
}
src -= stride*y;
}
src += stride*(HTAPS_MAX/2 - 1);
tmp2= tmp2t[2];
tmpI= tmpIt;
if(b&4){
for(y=0; y < b_h; y++){
for(x=0; x < b_w; x++){
int a_1=tmpI[x + (HTAPS_MAX/2-4)*64];
int a0= tmpI[x + (HTAPS_MAX/2-3)*64];
int a1= tmpI[x + (HTAPS_MAX/2-2)*64];
int a2= tmpI[x + (HTAPS_MAX/2-1)*64];
int a3= tmpI[x + (HTAPS_MAX/2+0)*64];
int a4= tmpI[x + (HTAPS_MAX/2+1)*64];
int a5= tmpI[x + (HTAPS_MAX/2+2)*64];
int a6= tmpI[x + (HTAPS_MAX/2+3)*64];
int am=0;
if(!p || p->fast_mc)
am= (20*(a2+a3) - 5*(a1+a4) + (a0+a5) + 512)>>10;
else
am= (p->hcoeff[0]*(a2+a3) + p->hcoeff[1]*(a1+a4) + p->hcoeff[2]*(a0+a5) + p->hcoeff[3]*(a_1+a6) + 2048)>>12;
if(am&(~255)) am= ~(am>>31);
tmp2[x]= am;
}
tmpI+= 64;
tmp2+= stride;
}
}
hpel[ 0]= src;
hpel[ 1]= tmp2t[0] + stride*(HTAPS_MAX/2-1);
hpel[ 2]= src + 1;
hpel[ 4]= tmp2t[1];
hpel[ 5]= tmp2t[2];
hpel[ 6]= tmp2t[1] + 1;
hpel[ 8]= src + stride;
hpel[ 9]= hpel[1] + stride;
hpel[10]= hpel[8] + 1;
if(b==15){
const uint8_t *src1= hpel[dx/8 + dy/8*4 ];
const uint8_t *src2= hpel[dx/8 + dy/8*4+1];
const uint8_t *src3= hpel[dx/8 + dy/8*4+4];
const uint8_t *src4= hpel[dx/8 + dy/8*4+5];
dx&=7;
dy&=7;
for(y=0; y < b_h; y++){
for(x=0; x < b_w; x++){
dst[x]= ((8-dx)*(8-dy)*src1[x] + dx*(8-dy)*src2[x]+
(8-dx)* dy *src3[x] + dx* dy *src4[x]+32)>>6;
}
src1+=stride;
src2+=stride;
src3+=stride;
src4+=stride;
dst +=stride;
}
}else{
const uint8_t *src1= hpel[l];
const uint8_t *src2= hpel[r];
int a= weight[((dx&7) + (8*(dy&7)))];
int b= 8-a;
for(y=0; y < b_h; y++){
for(x=0; x < b_w; x++){
dst[x]= (a*src1[x] + b*src2[x] + 4)>>3;
}
src1+=stride;
src2+=stride;
dst +=stride;
}
}
}
void ff_snow_pred_block(SnowContext *s, uint8_t *dst, uint8_t *tmp, int stride, int sx, int sy, int b_w, int b_h, BlockNode *block, int plane_index, int w, int h){
if(block->type & BLOCK_INTRA){
int x, y;
const unsigned color = block->color[plane_index];
const unsigned color4 = color*0x01010101;
if(b_w==32){
for(y=0; y < b_h; y++){
*(uint32_t*)&dst[0 + y*stride]= color4;
*(uint32_t*)&dst[4 + y*stride]= color4;
*(uint32_t*)&dst[8 + y*stride]= color4;
*(uint32_t*)&dst[12+ y*stride]= color4;
*(uint32_t*)&dst[16+ y*stride]= color4;
*(uint32_t*)&dst[20+ y*stride]= color4;
*(uint32_t*)&dst[24+ y*stride]= color4;
*(uint32_t*)&dst[28+ y*stride]= color4;
}
}else if(b_w==16){
for(y=0; y < b_h; y++){
*(uint32_t*)&dst[0 + y*stride]= color4;
*(uint32_t*)&dst[4 + y*stride]= color4;
*(uint32_t*)&dst[8 + y*stride]= color4;
*(uint32_t*)&dst[12+ y*stride]= color4;
}
}else if(b_w==8){
for(y=0; y < b_h; y++){
*(uint32_t*)&dst[0 + y*stride]= color4;
*(uint32_t*)&dst[4 + y*stride]= color4;
}
}else if(b_w==4){
for(y=0; y < b_h; y++){
*(uint32_t*)&dst[0 + y*stride]= color4;
}
}else{
for(y=0; y < b_h; y++){
for(x=0; x < b_w; x++){
dst[x + y*stride]= color;
}
}
}
}else{
uint8_t *src= s->last_picture[block->ref].data[plane_index];
const int scale= plane_index ? s->mv_scale : 2*s->mv_scale;
int mx= block->mx*scale;
int my= block->my*scale;
const int dx= mx&15;
const int dy= my&15;
const int tab_index= 3 - (b_w>>2) + (b_w>>4);
sx += (mx>>4) - (HTAPS_MAX/2-1);
sy += (my>>4) - (HTAPS_MAX/2-1);
src += sx + sy*stride;
if( (unsigned)sx >= w - b_w - (HTAPS_MAX-2)
|| (unsigned)sy >= h - b_h - (HTAPS_MAX-2)){
s->dsp.emulated_edge_mc(tmp + MB_SIZE, src, stride, b_w+HTAPS_MAX-1, b_h+HTAPS_MAX-1, sx, sy, w, h);
src= tmp + MB_SIZE;
}
// assert(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h);
// assert(!(b_w&(b_w-1)));
assert(b_w>1 && b_h>1);
assert((tab_index>=0 && tab_index<4) || b_w==32);
if((dx&3) || (dy&3) || !(b_w == b_h || 2*b_w == b_h || b_w == 2*b_h) || (b_w&(b_w-1)) || !s->plane[plane_index].fast_mc )
mc_block(&s->plane[plane_index], dst, src, stride, b_w, b_h, dx, dy);
else if(b_w==32){
int y;
for(y=0; y<b_h; y+=16){
s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + y*stride, src + 3 + (y+3)*stride,stride);
s->dsp.put_h264_qpel_pixels_tab[0][dy+(dx>>2)](dst + 16 + y*stride, src + 19 + (y+3)*stride,stride);
}
}else if(b_w==b_h)
s->dsp.put_h264_qpel_pixels_tab[tab_index ][dy+(dx>>2)](dst,src + 3 + 3*stride,stride);
else if(b_w==2*b_h){
s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst ,src + 3 + 3*stride,stride);
s->dsp.put_h264_qpel_pixels_tab[tab_index+1][dy+(dx>>2)](dst+b_h,src + 3 + b_h + 3*stride,stride);
}else{
assert(2*b_w==b_h);
s->dsp.put_h264_qpel_pixels_tab[tab_index ][dy+(dx>>2)](dst ,src + 3 + 3*stride ,stride);
s->dsp.put_h264_qpel_pixels_tab[tab_index ][dy+(dx>>2)](dst+b_w*stride,src + 3 + 3*stride+b_w*stride,stride);
}
}
}
#define mca(dx,dy,b_w)\
static void mc_block_hpel ## dx ## dy ## b_w(uint8_t *dst, const uint8_t *src, int stride, int h){\
assert(h==b_w);\
mc_block(NULL, dst, src-(HTAPS_MAX/2-1)-(HTAPS_MAX/2-1)*stride, stride, b_w, b_w, dx, dy);\
}
mca( 0, 0,16)
mca( 8, 0,16)
mca( 0, 8,16)
mca( 8, 8,16)
mca( 0, 0,8)
mca( 8, 0,8)
mca( 0, 8,8)
mca( 8, 8,8)
av_cold int ff_snow_common_init(AVCodecContext *avctx){
SnowContext *s = avctx->priv_data;
int width, height;
int i, j;
s->avctx= avctx;
s->max_ref_frames=1; //just make sure its not an invalid value in case of no initial keyframe
ff_dsputil_init(&s->dsp, avctx);
ff_dwt_init(&s->dwt);
#define mcf(dx,dy)\
s->dsp.put_qpel_pixels_tab [0][dy+dx/4]=\
s->dsp.put_no_rnd_qpel_pixels_tab[0][dy+dx/4]=\
s->dsp.put_h264_qpel_pixels_tab[0][dy+dx/4];\
s->dsp.put_qpel_pixels_tab [1][dy+dx/4]=\
s->dsp.put_no_rnd_qpel_pixels_tab[1][dy+dx/4]=\
s->dsp.put_h264_qpel_pixels_tab[1][dy+dx/4];
mcf( 0, 0)
mcf( 4, 0)
mcf( 8, 0)
mcf(12, 0)
mcf( 0, 4)
mcf( 4, 4)
mcf( 8, 4)
mcf(12, 4)
mcf( 0, 8)
mcf( 4, 8)
mcf( 8, 8)
mcf(12, 8)
mcf( 0,12)
mcf( 4,12)
mcf( 8,12)
mcf(12,12)
#define mcfh(dx,dy)\
s->dsp.put_pixels_tab [0][dy/4+dx/8]=\
s->dsp.put_no_rnd_pixels_tab[0][dy/4+dx/8]=\
mc_block_hpel ## dx ## dy ## 16;\
s->dsp.put_pixels_tab [1][dy/4+dx/8]=\
s->dsp.put_no_rnd_pixels_tab[1][dy/4+dx/8]=\
mc_block_hpel ## dx ## dy ## 8;
mcfh(0, 0)
mcfh(8, 0)
mcfh(0, 8)
mcfh(8, 8)
init_qexp();
// dec += FFMAX(s->chroma_h_shift, s->chroma_v_shift);
width= s->avctx->width;
height= s->avctx->height;
s->spatial_idwt_buffer= av_mallocz(width*height*sizeof(IDWTELEM));
s->spatial_dwt_buffer= av_mallocz(width*height*sizeof(DWTELEM)); //FIXME this does not belong here
for(i=0; i<MAX_REF_FRAMES; i++)
for(j=0; j<MAX_REF_FRAMES; j++)
ff_scale_mv_ref[i][j] = 256*(i+1)/(j+1);
s->avctx->get_buffer(s->avctx, &s->mconly_picture);
s->scratchbuf = av_mallocz(s->mconly_picture.linesize[0]*7*MB_SIZE);
return 0;
}
int ff_snow_common_init_after_header(AVCodecContext *avctx) {
SnowContext *s = avctx->priv_data;
int plane_index, level, orientation;
for(plane_index=0; plane_index<3; plane_index++){
int w= s->avctx->width;
int h= s->avctx->height;
if(plane_index){
w>>= s->chroma_h_shift;
h>>= s->chroma_v_shift;
}
s->plane[plane_index].width = w;
s->plane[plane_index].height= h;
for(level=s->spatial_decomposition_count-1; level>=0; level--){
for(orientation=level ? 1 : 0; orientation<4; orientation++){
SubBand *b= &s->plane[plane_index].band[level][orientation];
b->buf= s->spatial_dwt_buffer;
b->level= level;
b->stride= s->plane[plane_index].width << (s->spatial_decomposition_count - level);
b->width = (w + !(orientation&1))>>1;
b->height= (h + !(orientation>1))>>1;
b->stride_line = 1 << (s->spatial_decomposition_count - level);
b->buf_x_offset = 0;
b->buf_y_offset = 0;
if(orientation&1){
b->buf += (w+1)>>1;
b->buf_x_offset = (w+1)>>1;
}
if(orientation>1){
b->buf += b->stride>>1;
b->buf_y_offset = b->stride_line >> 1;
}
b->ibuf= s->spatial_idwt_buffer + (b->buf - s->spatial_dwt_buffer);
if(level)
b->parent= &s->plane[plane_index].band[level-1][orientation];
//FIXME avoid this realloc
av_freep(&b->x_coeff);
b->x_coeff=av_mallocz(((b->width+1) * b->height+1)*sizeof(x_and_coeff));
}
w= (w+1)>>1;
h= (h+1)>>1;
}
}
return 0;
}
#define USE_HALFPEL_PLANE 0
static void halfpel_interpol(SnowContext *s, uint8_t *halfpel[4][4], AVFrame *frame){
int p,x,y;
for(p=0; p<3; p++){
int is_chroma= !!p;
int w= s->avctx->width >>is_chroma;
int h= s->avctx->height >>is_chroma;
int ls= frame->linesize[p];
uint8_t *src= frame->data[p];
halfpel[1][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
halfpel[2][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
halfpel[3][p] = (uint8_t*) av_malloc(ls * (h + 2 * EDGE_WIDTH)) + EDGE_WIDTH * (1 + ls);
halfpel[0][p]= src;
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int i= y*ls + x;
halfpel[1][p][i]= (20*(src[i] + src[i+1]) - 5*(src[i-1] + src[i+2]) + (src[i-2] + src[i+3]) + 16 )>>5;
}
}
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int i= y*ls + x;
halfpel[2][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
}
}
src= halfpel[1][p];
for(y=0; y<h; y++){
for(x=0; x<w; x++){
int i= y*ls + x;
halfpel[3][p][i]= (20*(src[i] + src[i+ls]) - 5*(src[i-ls] + src[i+2*ls]) + (src[i-2*ls] + src[i+3*ls]) + 16 )>>5;
}
}
//FIXME border!
}
}
void ff_snow_release_buffer(AVCodecContext *avctx)
{
SnowContext *s = avctx->priv_data;
int i;
if(s->last_picture[s->max_ref_frames-1].data[0]){
avctx->release_buffer(avctx, &s->last_picture[s->max_ref_frames-1]);
for(i=0; i<9; i++)
if(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3])
av_free(s->halfpel_plane[s->max_ref_frames-1][1+i/3][i%3] - EDGE_WIDTH*(1+s->current_picture.linesize[i%3]));
}
}
int ff_snow_frame_start(SnowContext *s){
AVFrame tmp;
int w= s->avctx->width; //FIXME round up to x16 ?
int h= s->avctx->height;
if (s->current_picture.data[0] && !(s->avctx->flags&CODEC_FLAG_EMU_EDGE)) {
s->dsp.draw_edges(s->current_picture.data[0],
s->current_picture.linesize[0], w , h ,
EDGE_WIDTH , EDGE_WIDTH , EDGE_TOP | EDGE_BOTTOM);
s->dsp.draw_edges(s->current_picture.data[1],
s->current_picture.linesize[1], w>>1, h>>1,
EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);
s->dsp.draw_edges(s->current_picture.data[2],
s->current_picture.linesize[2], w>>1, h>>1,
EDGE_WIDTH/2, EDGE_WIDTH/2, EDGE_TOP | EDGE_BOTTOM);
}
ff_snow_release_buffer(s->avctx);
tmp= s->last_picture[s->max_ref_frames-1];
memmove(s->last_picture+1, s->last_picture, (s->max_ref_frames-1)*sizeof(AVFrame));
memmove(s->halfpel_plane+1, s->halfpel_plane, (s->max_ref_frames-1)*sizeof(void*)*4*4);
if(USE_HALFPEL_PLANE && s->current_picture.data[0])
halfpel_interpol(s, s->halfpel_plane[0], &s->current_picture);
s->last_picture[0]= s->current_picture;
s->current_picture= tmp;
if(s->keyframe){
s->ref_frames= 0;
}else{
int i;
for(i=0; i<s->max_ref_frames && s->last_picture[i].data[0]; i++)
if(i && s->last_picture[i-1].key_frame)
break;
s->ref_frames= i;
if(s->ref_frames==0){
av_log(s->avctx,AV_LOG_ERROR, "No reference frames\n");
return -1;
}
}
s->current_picture.reference= 3;
if(s->avctx->get_buffer(s->avctx, &s->current_picture) < 0){
av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
return -1;
}
s->current_picture.key_frame= s->keyframe;
return 0;
}
av_cold void ff_snow_common_end(SnowContext *s)
{
int plane_index, level, orientation, i;
av_freep(&s->spatial_dwt_buffer);
av_freep(&s->spatial_idwt_buffer);
s->m.me.temp= NULL;
av_freep(&s->m.me.scratchpad);
av_freep(&s->m.me.map);
av_freep(&s->m.me.score_map);
av_freep(&s->m.obmc_scratchpad);
av_freep(&s->block);
av_freep(&s->scratchbuf);
for(i=0; i<MAX_REF_FRAMES; i++){
av_freep(&s->ref_mvs[i]);
av_freep(&s->ref_scores[i]);
if(s->last_picture[i].data[0])
s->avctx->release_buffer(s->avctx, &s->last_picture[i]);
}
for(plane_index=0; plane_index<3; plane_index++){
for(level=s->spatial_decomposition_count-1; level>=0; level--){
for(orientation=level ? 1 : 0; orientation<4; orientation++){
SubBand *b= &s->plane[plane_index].band[level][orientation];
av_freep(&b->x_coeff);
}
}
}
if (s->mconly_picture.data[0])
s->avctx->release_buffer(s->avctx, &s->mconly_picture);
if (s->current_picture.data[0])
s->avctx->release_buffer(s->avctx, &s->current_picture);
}