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ffmpeg/libavcodec/roqvideo.c

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/*
* Copyright (C) 2003 the ffmpeg project
*
* 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 roqvideo.c
* Id RoQ Video common functions based on work by Dr. Tim Ferguson
*/
#include "avcodec.h"
#include "roqvideo.h"
#define avg2(a,b) av_clip_uint8(((int)(a)+(int)(b)+1)>>1)
#define avg4(a,b,c,d) av_clip_uint8(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)
void ff_apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
{
unsigned char *yptr;
yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
*yptr++ = cell->y[0];
*yptr++ = cell->y[1];
yptr += (ri->y_stride - 2);
*yptr++ = cell->y[2];
*yptr++ = cell->y[3];
ri->current_frame->data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
ri->current_frame->data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
}
void ff_apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
{
unsigned long row_inc, c_row_inc;
register unsigned char y0, y1, u, v;
unsigned char *yptr, *uptr, *vptr;
yptr = ri->current_frame->data[0] + (y * ri->y_stride) + x;
uptr = ri->current_frame->data[1] + (y/2) * (ri->c_stride) + x/2;
vptr = ri->current_frame->data[2] + (y/2) * (ri->c_stride) + x/2;
row_inc = ri->y_stride - 4;
c_row_inc = (ri->c_stride) - 2;
*yptr++ = y0 = cell->y[0]; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
*yptr++ = y0;
*yptr++ = y1 = cell->y[1]; *uptr++ = u; *vptr++ = v;
*yptr++ = y1;
yptr += row_inc;
*yptr++ = y0;
*yptr++ = y0;
*yptr++ = y1;
*yptr++ = y1;
yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
*yptr++ = y0 = cell->y[2]; *uptr++ = u; *vptr++ = v;
*yptr++ = y0;
*yptr++ = y1 = cell->y[3]; *uptr++ = u; *vptr++ = v;
*yptr++ = y1;
yptr += row_inc;
*yptr++ = y0;
*yptr++ = y0;
*yptr++ = y1;
*yptr++ = y1;
}
void ff_apply_motion_4x4(RoqContext *ri, int x, int y,
int deltax, int deltay)
{
int i, hw, mx, my;
unsigned char *pa, *pb;
mx = x + deltax;
my = y + deltay;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 4) ||
(my < 0) || (my > ri->avctx->height - 4)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 4; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa += ri->y_stride;
pb += ri->y_stride;
}
hw = ri->y_stride/2;
pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(i = 0; i < 2; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[hw] = pb[hw];
pa[hw+1] = pb[hw+1];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[hw] = avg2(pb[hw], pb[hw+1]);
pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[hw] = avg2(pb[hw], pb[hw*2]);
pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
break;
}
pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
}
void ff_apply_motion_8x8(RoqContext *ri, int x, int y,
int deltax, int deltay)
{
int mx, my, i, j, hw;
unsigned char *pa, *pb;
mx = x + deltax;
my = y + deltay;
/* check MV against frame boundaries */
if ((mx < 0) || (mx > ri->avctx->width - 8) ||
(my < 0) || (my > ri->avctx->height - 8)) {
av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)\n",
mx, my, ri->avctx->width, ri->avctx->height);
return;
}
pa = ri->current_frame->data[0] + (y * ri->y_stride) + x;
pb = ri->last_frame->data[0] + (my * ri->y_stride) + mx;
for(i = 0; i < 8; i++) {
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
pa[4] = pb[4];
pa[5] = pb[5];
pa[6] = pb[6];
pa[7] = pb[7];
pa += ri->y_stride;
pb += ri->y_stride;
}
hw = ri->c_stride;
pa = ri->current_frame->data[1] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
for(j = 0; j < 2; j++) {
for(i = 0; i < 4; i++) {
switch(((my & 0x01) << 1) | (mx & 0x01)) {
case 0:
pa[0] = pb[0];
pa[1] = pb[1];
pa[2] = pb[2];
pa[3] = pb[3];
break;
case 1:
pa[0] = avg2(pb[0], pb[1]);
pa[1] = avg2(pb[1], pb[2]);
pa[2] = avg2(pb[2], pb[3]);
pa[3] = avg2(pb[3], pb[4]);
break;
case 2:
pa[0] = avg2(pb[0], pb[hw]);
pa[1] = avg2(pb[1], pb[hw+1]);
pa[2] = avg2(pb[2], pb[hw+2]);
pa[3] = avg2(pb[3], pb[hw+3]);
break;
case 3:
pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
break;
}
pa += ri->c_stride;
pb += ri->c_stride;
}
pa = ri->current_frame->data[2] + (y * ri->y_stride)/4 + x/2;
pb = ri->last_frame->data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
}
}
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