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ffmpeg/libavcodec/h263.c

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/*
* H.263/MPEG-4 backend for encoder and decoder
* Copyright (c) 2000,2001 Fabrice Bellard
* H.263+ support.
* Copyright (c) 2001 Juan J. Sierralta P
* Copyright (c) 2002-2004 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
*/
/**
* @file
* H.263/MPEG-4 codec.
*/
#include "libavutil/thread.h"
#include "mpegvideo.h"
#include "h263.h"
#include "h263data.h"
#include "h263dsp.h"
#include "idctdsp.h"
#include "mathops.h"
#include "mpegpicture.h"
#include "mpegutils.h"
#include "rl.h"
static av_cold void h263_init_rl_inter(void)
{
static uint8_t h263_rl_inter_table[2][2 * MAX_RUN + MAX_LEVEL + 3];
ff_rl_init(&ff_h263_rl_inter, h263_rl_inter_table);
}
av_cold void ff_h263_init_rl_inter(void)
{
static AVOnce init_static_once = AV_ONCE_INIT;
ff_thread_once(&init_static_once, h263_init_rl_inter);
}
void ff_h263_update_motion_val(MpegEncContext * s){
const int mb_xy = s->mb_y * s->mb_stride + s->mb_x;
//FIXME a lot of that is only needed for !low_delay
const int wrap = s->b8_stride;
const int xy = s->block_index[0];
if(s->mv_type != MV_TYPE_8X8){
int motion_x, motion_y;
if (s->mb_intra) {
motion_x = 0;
motion_y = 0;
} else if (s->mv_type == MV_TYPE_16X16) {
motion_x = s->mv[0][0][0];
motion_y = s->mv[0][0][1];
} else /*if (s->mv_type == MV_TYPE_FIELD)*/ {
int i;
motion_x = s->mv[0][0][0] + s->mv[0][1][0];
motion_y = s->mv[0][0][1] + s->mv[0][1][1];
motion_x = (motion_x>>1) | (motion_x&1);
for(i=0; i<2; i++){
s->p_field_mv_table[i][0][mb_xy][0]= s->mv[0][i][0];
s->p_field_mv_table[i][0][mb_xy][1]= s->mv[0][i][1];
}
s->cur_pic.ref_index[0][4*mb_xy ] =
s->cur_pic.ref_index[0][4*mb_xy + 1] = s->field_select[0][0];
s->cur_pic.ref_index[0][4*mb_xy + 2] =
s->cur_pic.ref_index[0][4*mb_xy + 3] = s->field_select[0][1];
}
/* no update if 8X8 because it has been done during parsing */
s->cur_pic.motion_val[0][xy][0] = motion_x;
s->cur_pic.motion_val[0][xy][1] = motion_y;
s->cur_pic.motion_val[0][xy + 1][0] = motion_x;
s->cur_pic.motion_val[0][xy + 1][1] = motion_y;
s->cur_pic.motion_val[0][xy + wrap][0] = motion_x;
s->cur_pic.motion_val[0][xy + wrap][1] = motion_y;
s->cur_pic.motion_val[0][xy + 1 + wrap][0] = motion_x;
s->cur_pic.motion_val[0][xy + 1 + wrap][1] = motion_y;
}
}
void ff_h263_loop_filter(MpegEncContext * s){
int qp_c;
const int linesize = s->linesize;
const int uvlinesize= s->uvlinesize;
const int xy = s->mb_y * s->mb_stride + s->mb_x;
uint8_t *dest_y = s->dest[0];
uint8_t *dest_cb= s->dest[1];
uint8_t *dest_cr= s->dest[2];
/*
Diag Top
Left Center
*/
if (!IS_SKIP(s->cur_pic.mb_type[xy])) {
qp_c= s->qscale;
s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize, linesize, qp_c);
s->h263dsp.h263_v_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
}else
qp_c= 0;
if(s->mb_y){
int qp_dt, qp_tt, qp_tc;
if (IS_SKIP(s->cur_pic.mb_type[xy - s->mb_stride]))
qp_tt=0;
else
qp_tt = s->cur_pic.qscale_table[xy - s->mb_stride];
if(qp_c)
qp_tc= qp_c;
else
qp_tc= qp_tt;
if(qp_tc){
const int chroma_qp= s->chroma_qscale_table[qp_tc];
s->h263dsp.h263_v_loop_filter(dest_y, linesize, qp_tc);
s->h263dsp.h263_v_loop_filter(dest_y + 8, linesize, qp_tc);
s->h263dsp.h263_v_loop_filter(dest_cb, uvlinesize, chroma_qp);
s->h263dsp.h263_v_loop_filter(dest_cr, uvlinesize, chroma_qp);
}
if(qp_tt)
s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize + 8, linesize, qp_tt);
if(s->mb_x){
if (qp_tt || IS_SKIP(s->cur_pic.mb_type[xy - 1 - s->mb_stride]))
qp_dt= qp_tt;
else
qp_dt = s->cur_pic.qscale_table[xy - 1 - s->mb_stride];
if(qp_dt){
const int chroma_qp= s->chroma_qscale_table[qp_dt];
s->h263dsp.h263_h_loop_filter(dest_y - 8 * linesize, linesize, qp_dt);
s->h263dsp.h263_h_loop_filter(dest_cb - 8 * uvlinesize, uvlinesize, chroma_qp);
s->h263dsp.h263_h_loop_filter(dest_cr - 8 * uvlinesize, uvlinesize, chroma_qp);
}
}
}
if(qp_c){
s->h263dsp.h263_h_loop_filter(dest_y + 8, linesize, qp_c);
if(s->mb_y + 1 == s->mb_height)
s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize + 8, linesize, qp_c);
}
if(s->mb_x){
int qp_lc;
if (qp_c || IS_SKIP(s->cur_pic.mb_type[xy - 1]))
qp_lc= qp_c;
else
qp_lc = s->cur_pic.qscale_table[xy - 1];
if(qp_lc){
s->h263dsp.h263_h_loop_filter(dest_y, linesize, qp_lc);
if(s->mb_y + 1 == s->mb_height){
const int chroma_qp= s->chroma_qscale_table[qp_lc];
s->h263dsp.h263_h_loop_filter(dest_y + 8 * linesize, linesize, qp_lc);
s->h263dsp.h263_h_loop_filter(dest_cb, uvlinesize, chroma_qp);
s->h263dsp.h263_h_loop_filter(dest_cr, uvlinesize, chroma_qp);
}
}
}
}
int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir,
int *px, int *py)
{
int wrap;
int16_t *A, *B, *C, (*mot_val)[2];
static const int off[4]= {2, 1, 1, -1};
wrap = s->b8_stride;
mot_val = s->cur_pic.motion_val[dir] + s->block_index[block];
A = mot_val[ - 1];
/* special case for first (slice) line */
if (s->first_slice_line && block<3) {
// we can't just change some MVs to simulate that as we need them for the B-frames (and ME)
// and if we ever support non rectangular objects than we need to do a few ifs here anyway :(
if(block==0){ //most common case
if(s->mb_x == s->resync_mb_x){ //rare
*px= *py = 0;
}else if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
C = mot_val[off[block] - wrap];
if(s->mb_x==0){
*px = C[0];
*py = C[1];
}else{
*px = mid_pred(A[0], 0, C[0]);
*py = mid_pred(A[1], 0, C[1]);
}
}else{
*px = A[0];
*py = A[1];
}
}else if(block==1){
if(s->mb_x + 1 == s->resync_mb_x && s->h263_pred){ //rare
C = mot_val[off[block] - wrap];
*px = mid_pred(A[0], 0, C[0]);
*py = mid_pred(A[1], 0, C[1]);
}else{
*px = A[0];
*py = A[1];
}
}else{ /* block==2*/
B = mot_val[ - wrap];
C = mot_val[off[block] - wrap];
if(s->mb_x == s->resync_mb_x) //rare
A[0]=A[1]=0;
*px = mid_pred(A[0], B[0], C[0]);
*py = mid_pred(A[1], B[1], C[1]);
}
} else {
B = mot_val[ - wrap];
C = mot_val[off[block] - wrap];
*px = mid_pred(A[0], B[0], C[0]);
*py = mid_pred(A[1], B[1], C[1]);
}
return *mot_val;
}
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