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FFmpeg/libavcodec/imgconvert.c

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/*
* 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 "avcodec.h"
#include "dsputil.h"
#ifdef USE_FASTMEMCPY
#include "fastmemcpy.h"
#endif
/* 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;
}
}
/* XXX: use generic filter ? */
/* 1x2 -> 1x1 */
static void shrink2(UINT8 *dst, int dst_wrap,
UINT8 *src, int src_wrap,
int width, int height)
{
int w;
UINT8 *s1, *s2, *d;
for(;height > 0; height--) {
s1 = src;
s2 = s1 + src_wrap;
d = dst;
for(w = width;w >= 4; w-=4) {
d[0] = (s1[0] + s2[0]) >> 1;
d[1] = (s1[1] + s2[1]) >> 1;
d[2] = (s1[2] + s2[2]) >> 1;
d[3] = (s1[3] + s2[3]) >> 1;
s1 += 4;
s2 += 4;
d += 4;
}
for(;w > 0; w--) {
d[0] = (s1[0] + s2[0]) >> 1;
s1++;
s2++;
d++;
}
src += 2 * src_wrap;
dst += dst_wrap;
}
}
/* 2x2 -> 1x1 */
static void shrink22(UINT8 *dst, int dst_wrap,
UINT8 *src, int src_wrap,
int width, int height)
{
int w;
UINT8 *s1, *s2, *d;
for(;height > 0; height--) {
s1 = src;
s2 = s1 + src_wrap;
d = dst;
for(w = width;w >= 4; w-=4) {
d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 1;
d[1] = (s1[2] + s1[3] + s2[2] + s2[3] + 2) >> 1;
d[2] = (s1[4] + s1[5] + s2[4] + s2[5] + 2) >> 1;
d[3] = (s1[6] + s1[7] + s2[6] + s2[7] + 2) >> 1;
s1 += 8;
s2 += 8;
d += 4;
}
for(;w > 0; w--) {
d[0] = (s1[0] + s1[1] + s2[0] + s2[1] + 2) >> 1;
s1 += 2;
s2 += 2;
d++;
}
src += 2 * src_wrap;
dst += dst_wrap;
}
}
static void img_copy(UINT8 *dst, int dst_wrap,
UINT8 *src, int src_wrap,
int width, int height)
{
for(;height > 0; height--) {
memcpy(dst, src, width);
dst += dst_wrap;
src += src_wrap;
}
}
#define SCALE_BITS 10
#define C_Y (76309 >> (16 - SCALE_BITS))
#define C_RV (117504 >> (16 - SCALE_BITS))
#define C_BU (138453 >> (16 - SCALE_BITS))
#define C_GU (13954 >> (16 - SCALE_BITS))
#define C_GV (34903 >> (16 - SCALE_BITS))
#define RGBOUT(r, g, b, y1)\
{\
y = (y1 - 16) * C_Y;\
r = cm[(y + r_add) >> SCALE_BITS];\
g = cm[(y + g_add) >> SCALE_BITS];\
b = cm[(y + b_add) >> SCALE_BITS];\
}
/* XXX: no chroma interpolating is done */
static void yuv420p_to_rgb24(AVPicture *dst, AVPicture *src,
int width, int height)
{
UINT8 *y1_ptr, *y2_ptr, *cb_ptr, *cr_ptr, *d, *d1, *d2;
int w, y, cb, cr, r_add, g_add, b_add, width2;
UINT8 *cm = cropTbl + MAX_NEG_CROP;
d = dst->data[0];
y1_ptr = src->data[0];
cb_ptr = src->data[1];
cr_ptr = src->data[2];
width2 = width >> 1;
for(;height > 0; height -= 2) {
d1 = d;
d2 = d + dst->linesize[0];
y2_ptr = y1_ptr + src->linesize[0];
for(w = width2; w > 0; w --) {
cb = cb_ptr[0] - 128;
cr = cr_ptr[0] - 128;
r_add = C_RV * cr + (1 << (SCALE_BITS - 1));
g_add = - C_GU * cb - C_GV * cr + (1 << (SCALE_BITS - 1));
b_add = C_BU * cb + (1 << (SCALE_BITS - 1));
/* output 4 pixels */
RGBOUT(d1[0], d1[1], d1[2], y1_ptr[0]);
RGBOUT(d1[3], d1[4], d1[5], y1_ptr[1]);
RGBOUT(d2[0], d2[1], d2[2], y2_ptr[0]);
RGBOUT(d2[3], d2[4], d2[5], y2_ptr[1]);
d1 += 6;
d2 += 6;
y1_ptr += 2;
y2_ptr += 2;
cb_ptr++;
cr_ptr++;
}
d += 2 * dst->linesize[0];
y1_ptr += 2 * src->linesize[0] - width;
cb_ptr += src->linesize[1] - width2;
cr_ptr += src->linesize[2] - width2;
}
}
/* XXX: no chroma interpolating is done */
static void yuv422p_to_rgb24(AVPicture *dst, AVPicture *src,
int width, int height)
{
UINT8 *y1_ptr, *cb_ptr, *cr_ptr, *d, *d1;
int w, y, cb, cr, r_add, g_add, b_add, width2;
UINT8 *cm = cropTbl + MAX_NEG_CROP;
d = dst->data[0];
y1_ptr = src->data[0];
cb_ptr = src->data[1];
cr_ptr = src->data[2];
width2 = width >> 1;
for(;height > 0; height --) {
d1 = d;
for(w = width2; w > 0; w --) {
cb = cb_ptr[0] - 128;
cr = cr_ptr[0] - 128;
r_add = C_RV * cr + (1 << (SCALE_BITS - 1));
g_add = - C_GU * cb - C_GV * cr + (1 << (SCALE_BITS - 1));
b_add = C_BU * cb + (1 << (SCALE_BITS - 1));
/* output 2 pixels */
RGBOUT(d1[0], d1[1], d1[2], y1_ptr[0]);
RGBOUT(d1[3], d1[4], d1[5], y1_ptr[1]);
d1 += 6;
y1_ptr += 2;
cb_ptr++;
cr_ptr++;
}
d += dst->linesize[0];
y1_ptr += src->linesize[0] - width;
cb_ptr += src->linesize[1] - width2;
cr_ptr += src->linesize[2] - width2;
}
}
/* XXX: always use linesize. Return -1 if not supported */
int img_convert(AVPicture *dst, int dst_pix_fmt,
AVPicture *src, int pix_fmt,
int width, int height)
{
int i;
if (dst_pix_fmt == pix_fmt) {
switch(pix_fmt) {
case PIX_FMT_YUV420P:
for(i=0;i<3;i++) {
if (i == 1) {
width >>= 1;
height >>= 1;
}
img_copy(dst->data[i], dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
break;
default:
return -1;
}
} else if (dst_pix_fmt == PIX_FMT_YUV420P) {
switch(pix_fmt) {
case PIX_FMT_YUV420P:
for(i=0;i<3;i++) {
img_copy(dst->data[i], dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
break;
case PIX_FMT_YUV422P:
img_copy(dst->data[0], dst->linesize[0],
src->data[0], src->linesize[0],
width, height);
width >>= 1;
height >>= 1;
for(i=1;i<3;i++) {
shrink2(dst->data[i], dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
break;
case PIX_FMT_YUV444P:
img_copy(dst->data[0], dst->linesize[0],
src->data[0], src->linesize[0],
width, height);
width >>= 1;
height >>= 1;
for(i=1;i<3;i++) {
shrink22(dst->data[i], dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
break;
case PIX_FMT_YUV422:
yuv422_to_yuv420p(dst->data[0], dst->data[1], dst->data[2],
src->data[0], width, height);
break;
case PIX_FMT_RGB24:
rgb24_to_yuv420p(dst->data[0], dst->data[1], dst->data[2],
src->data[0], width, height);
break;
case PIX_FMT_BGR24:
bgr24_to_yuv420p(dst->data[0], dst->data[1], dst->data[2],
src->data[0], width, height);
break;
default:
return -1;
}
} else if (dst_pix_fmt == PIX_FMT_RGB24) {
switch(pix_fmt) {
case PIX_FMT_YUV420P:
yuv420p_to_rgb24(dst, src, width, height);
break;
case PIX_FMT_YUV422P:
yuv422p_to_rgb24(dst, src, width, height);
break;
default:
return -1;
}
} else {
return -1;
}
return 0;
}
/* filter parameters: [-1 4 2 4 -1] // 8 */
static void deinterlace_line(UINT8 *dst, UINT8 *src, int src_wrap,
int size)
{
UINT8 *cm = cropTbl + MAX_NEG_CROP;
int sum;
UINT8 *s;
for(;size > 0;size--) {
s = src;
sum = -s[0];
s += src_wrap;
sum += s[0] << 2;
s += src_wrap;
sum += s[0] << 1;
s += src_wrap;
sum += s[0] << 2;
s += src_wrap;
sum += -s[0];
dst[0] = cm[(sum + 4) >> 3];
dst++;
src++;
}
}
/* deinterlacing : 2 temporal taps, 3 spatial taps linear filter. The
top field is copied as is, but the bottom field is deinterlaced
against the top field. */
static void deinterlace_bottom_field(UINT8 *dst, int dst_wrap,
UINT8 *src1, int src_wrap,
int width, int height)
{
UINT8 *src, *ptr;
int y, y1, i;
UINT8 *buf;
buf= (UINT8*) malloc(5 * width);
src = src1;
for(y=0;y<height;y+=2) {
/* copy top field line */
memcpy(dst, src, width);
dst += dst_wrap;
src += (1 - 2) * src_wrap;
y1 = y - 2;
if (y1 >= 0 && (y1 + 4) < height) {
/* fast case : no edges */
deinterlace_line(dst, src, src_wrap, width);
} else {
/* in order to use the same function, we use an intermediate buffer */
ptr = buf;
for(i=0;i<5;i++) {
if (y1 < 0)
memcpy(ptr, src1, width);
else if (y1 >= height)
memcpy(ptr, src1 + (height - 1) * src_wrap, width);
else
memcpy(ptr, src1 + y1 * src_wrap, width);
y1++;
ptr += width;
}
deinterlace_line(dst, buf, width, width);
}
dst += dst_wrap;
src += (2 + 1) * src_wrap;
}
free(buf);
}
/* deinterlace, return -1 if format not handled */
int avpicture_deinterlace(AVPicture *dst, AVPicture *src,
int pix_fmt, int width, int height)
{
int i;
if (pix_fmt != PIX_FMT_YUV420P &&
pix_fmt != PIX_FMT_YUV422P &&
pix_fmt != PIX_FMT_YUV444P)
return -1;
if ((width & 1) != 0 || (height & 3) != 0)
return -1;
for(i=0;i<3;i++) {
if (i == 1) {
switch(pix_fmt) {
case PIX_FMT_YUV420P:
width >>= 1;
height >>= 1;
break;
case PIX_FMT_YUV422P:
width >>= 1;
break;
default:
break;
}
}
deinterlace_bottom_field(dst->data[i], dst->linesize[i],
src->data[i], src->linesize[i],
width, height);
}
return 0;
}