mirror of
https://git.ffmpeg.org/ffmpeg.git
synced 2024-12-12 18:25:03 +00:00
215 lines
6.1 KiB
C
215 lines
6.1 KiB
C
/*
|
|
* Misc image convertion routines
|
|
* Copyright (c) 2001 Gerard Lantau.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; either version 2 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* This program 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
*/
|
|
#include <stdlib.h>
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include "avcodec.h"
|
|
|
|
/* XXX: totally non optimized */
|
|
|
|
static void yuv422_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
|
|
UINT8 *src, int width, int height)
|
|
{
|
|
int x, y;
|
|
UINT8 *p = src;
|
|
|
|
for(y=0;y<height;y+=2) {
|
|
for(x=0;x<width;x+=2) {
|
|
lum[0] = p[0];
|
|
cb[0] = p[1];
|
|
lum[1] = p[2];
|
|
cr[0] = p[3];
|
|
p += 4;
|
|
lum += 2;
|
|
cb++;
|
|
cr++;
|
|
}
|
|
for(x=0;x<width;x+=2) {
|
|
lum[0] = p[0];
|
|
lum[1] = p[2];
|
|
p += 4;
|
|
lum += 2;
|
|
}
|
|
}
|
|
}
|
|
|
|
#define SCALEBITS 8
|
|
#define ONE_HALF (1 << (SCALEBITS - 1))
|
|
#define FIX(x) ((int) ((x) * (1L<<SCALEBITS) + 0.5))
|
|
|
|
static void rgb24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
|
|
UINT8 *src, int width, int height)
|
|
{
|
|
int wrap, wrap3, x, y;
|
|
int r, g, b, r1, g1, b1;
|
|
UINT8 *p;
|
|
|
|
wrap = width;
|
|
wrap3 = width * 3;
|
|
p = src;
|
|
for(y=0;y<height;y+=2) {
|
|
for(x=0;x<width;x+=2) {
|
|
r = p[0];
|
|
g = p[1];
|
|
b = p[2];
|
|
r1 = r;
|
|
g1 = g;
|
|
b1 = b;
|
|
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
r = p[3];
|
|
g = p[4];
|
|
b = p[5];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
p += wrap3;
|
|
lum += wrap;
|
|
|
|
r = p[0];
|
|
g = p[1];
|
|
b = p[2];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
r = p[3];
|
|
g = p[4];
|
|
b = p[5];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
|
|
cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
|
|
FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
|
|
cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
|
|
FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
|
|
|
|
cb++;
|
|
cr++;
|
|
p += -wrap3 + 2 * 3;
|
|
lum += -wrap + 2;
|
|
}
|
|
p += wrap3;
|
|
lum += wrap;
|
|
}
|
|
}
|
|
|
|
static void bgr24_to_yuv420p(UINT8 *lum, UINT8 *cb, UINT8 *cr,
|
|
UINT8 *src, int width, int height)
|
|
{
|
|
int wrap, wrap3, x, y;
|
|
int r, g, b, r1, g1, b1;
|
|
UINT8 *p;
|
|
|
|
wrap = width;
|
|
wrap3 = width * 3;
|
|
p = src;
|
|
for(y=0;y<height;y+=2) {
|
|
for(x=0;x<width;x+=2) {
|
|
b = p[0];
|
|
g = p[1];
|
|
r = p[2];
|
|
r1 = r;
|
|
g1 = g;
|
|
b1 = b;
|
|
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
b = p[3];
|
|
g = p[4];
|
|
r = p[5];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
p += wrap3;
|
|
lum += wrap;
|
|
|
|
b = p[0];
|
|
g = p[1];
|
|
r = p[2];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[0] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
b = p[3];
|
|
g = p[4];
|
|
r = p[5];
|
|
r1 += r;
|
|
g1 += g;
|
|
b1 += b;
|
|
lum[1] = (FIX(0.29900) * r + FIX(0.58700) * g +
|
|
FIX(0.11400) * b + ONE_HALF) >> SCALEBITS;
|
|
|
|
cb[0] = ((- FIX(0.16874) * r1 - FIX(0.33126) * g1 +
|
|
FIX(0.50000) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
|
|
cr[0] = ((FIX(0.50000) * r1 - FIX(0.41869) * g1 -
|
|
FIX(0.08131) * b1 + 4 * ONE_HALF - 1) >> (SCALEBITS + 2)) + 128;
|
|
|
|
cb++;
|
|
cr++;
|
|
p += -wrap3 + 2 * 3;
|
|
lum += -wrap + 2;
|
|
}
|
|
p += wrap3;
|
|
lum += wrap;
|
|
}
|
|
}
|
|
|
|
int img_convert_to_yuv420(UINT8 *img_out, UINT8 *img,
|
|
int pix_fmt, int width, int height)
|
|
{
|
|
UINT8 *pict;
|
|
int size, size_out;
|
|
UINT8 *picture[3];
|
|
|
|
pict = img_out;
|
|
size = width * height;
|
|
size_out = (size * 3) / 2;
|
|
picture[0] = pict;
|
|
picture[1] = pict + size;
|
|
picture[2] = picture[1] + (size / 4);
|
|
|
|
switch(pix_fmt) {
|
|
case PIX_FMT_YUV420P:
|
|
memcpy(pict, img, size_out);
|
|
break;
|
|
case PIX_FMT_YUV422:
|
|
yuv422_to_yuv420p(picture[0], picture[1], picture[2],
|
|
img, width, height);
|
|
break;
|
|
case PIX_FMT_RGB24:
|
|
rgb24_to_yuv420p(picture[0], picture[1], picture[2],
|
|
img, width, height);
|
|
break;
|
|
case PIX_FMT_BGR24:
|
|
bgr24_to_yuv420p(picture[0], picture[1], picture[2],
|
|
img, width, height);
|
|
break;
|
|
}
|
|
return size_out;
|
|
}
|