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1115507122e1668a78751188add65a47c6cd0e96
veejay/veejay-current/libyuv/subsample.c
Niels Elburg 1115507122 librified 
git-svn-id: svn://code.dyne.org/veejay/trunk@162 eb8d1916-c9e9-0310-b8de-cf0c9472ead5
2005-01-31 15:36:31 +00:00

554 lines
14 KiB
C
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/*
* subsample.c: Routines to do chroma subsampling. ("Work In Progress")
*
*
* Copyright (C) 2001 Matthew J. Marjanovic <maddog@mir.com>
* 2004 Niels Elburg <nelburg@looze.net>
*
* 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*
*/
#include <config.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <utils/mjpeg_types.h>
#include <libvjmem/vjmem.h>
#include <libvjmsg/vj-common.h>
#include <libyuv/yuvconv.h>
const char *ssm_id[SSM_COUNT] = {
"unknown",
"420_jpeg",
"420_mpeg2",
#if 0
"420_dv_pal",
"411_dv_ntsc"
#endif
};
const char *ssm_description[SSM_COUNT] = {
"unknown/illegal",
"4:2:0, JPEG/MPEG-1, interstitial siting",
"4:2:0, MPEG-2, horizontal cositing",
#if 0
"4:2:0, DV-PAL, cosited, Cb/Cr line alternating",
"4:1:1, DV-NTSC"
"4:2:2",
#endif
};
// forward decl
void ss_420_to_422(uint8_t *buffer, int width, int height);
void ss_422_to_420(uint8_t *buffer, int width, int height);
static uint8_t *sample_buffer;
static int go = 0;
void subsample_init()
{
sample_buffer = (uint8_t*) vj_malloc(sizeof(uint8_t) * 720 * 576 );
memset(sample_buffer,128,(720*576));
go = 1;
}
/*************************************************************************
* Chroma Subsampling
*************************************************************************/
/* vertical/horizontal interstitial siting
*
* Y Y Y Y
* C C
* Y Y Y Y
*
* Y Y Y Y
* C C
* Y Y Y Y
*
*/
/*
static void ss_444_to_420jpeg(uint8_t *buffer, int width, int height)
{
uint8_t *in0, *in1, *out;
int x, y;
in0 = buffer;
in1 = buffer + width;
out = buffer;
for (y = 0; y < height; y += 2) {
for (x = 0; x < width; x += 2) {
*out = (in0[0] + in0[1] + in1[0] + in1[1]) >> 2;
in0 += 2;
in1 += 2;
out++;
}
in0 += width;
in1 += width;
}
}
*/
/*
using weighted averaging for subsampling 2x2 -> 1x1
here, 4 pixels are filled in each inner loop, (weighting
16 source pixels)
*/
static void ss_444_to_420jpeg(uint8_t *buffer, int width, int height)
{
const uint8_t *in0, *in1;
uint8_t *out;
int x, y = height;
in0 = buffer;
in1 = buffer + width;
out = buffer;
for (y = 0; y < height; y += 4) {
for (x = 0; x < width; x += 4) {
out[0] = (in0[0] + 3 * (in0[1] + in1[0]) + (9 * in1[1]) + 8) >> 4;
out[1] = (in0[2] + 3 * (in0[3] + in1[2]) + (9 * in1[3]) + 8) >> 4;
out[2] = (in0[4] + 3 * (in0[5] + in1[4]) + (9 * in1[5]) + 8) >> 4;
out[3] = (in0[6] + 3 * (in0[7] + in1[6]) + (9 * in1[7]) + 8) >> 4;
in0 += 8;
in1 += 8;
out += 4;
}
for ( ; x < width; x +=2 )
{
out[0] = (in0[0] + 3 * (in0[1] + in1[0]) + (9 * in1[1]) + 8) >> 4;
in0 += 2;
in1 += 2;
out++;
}
in0 += width*2;
in1 += width*2;
}
}
/* horizontal interstitial siting
*
* Y Y Y Y
* C C C C in0
* Y Y Y Y
* C C C C
*
* Y Y Y Y
* C C out0
* Y Y Y Y
* C C
*
*
*/
/* vertical/horizontal interstitial siting
*
* Y Y Y Y
* C C C inm
* Y Y Y Y
*
* Y Y Y - Y out0
* C | C | C in0
* Y Y Y - Y out1
*
*
* C C C inp
*
*
* Each iteration through the loop reconstitutes one 2x2 block of
* pixels from the "surrounding" 3x3 block of samples...
* Boundary conditions are handled by cheap reflection; i.e. the
* center sample is simply reused.
*
*/
#define BLANK_CRB in0[1]
#define BLANK_CRB_2 (in0[1] << 1)
static void tr_420jpeg_to_444(uint8_t *buffer, int width, int height)
{
uint8_t *inm, *in0, *inp, *out0, *out1;
uint8_t cmm, cm0, cmp, c0m, c00, c0p, cpm, cp0, cpp;
int x, y;
static uint8_t *saveme = NULL;
static int saveme_size = 0;
if (width > saveme_size) {
free(saveme);
saveme_size = width;
saveme = vj_malloc(saveme_size * sizeof(saveme[0]));
assert(saveme != NULL);
}
veejay_memcpy(saveme, buffer, width);
in0 = buffer + ( width * height /4) - 2;
inm = in0 - width/2;
inp = in0 + width/2;
out1 = buffer + (width * height) - 1;
out0 = out1 - width;
for (y = height; y > 0; y -= 2) {
if (y == 2) {
in0 = saveme + width/2 - 2;
inp = in0 + width/2;
}
for (x = width; x > 0; x -= 2) {
#if 0
if ((x == 2) && (y == 2)) {
cmm = in0[1];
cm0 = in0[1];
cmp = in0[2];
c0m = in0[1];
c0p = in0[2];
cpm = inp[1];
cp0 = inp[1];
cpp = inp[2];
} else if ((x == 2) && (y == height)) {
cmm = inm[1];
cm0 = inm[1];
cmp = inm[2];
c0m = in0[1];
c0p = in0[2];
cpm = in0[1];
cp0 = in0[1];
cpp = in0[2];
} else if ((x == width) && (y == height)) {
cmm = inm[0];
cm0 = inm[1];
cmp = inm[1];
c0m = in0[0];
c0p = in0[1];
cpm = in0[0];
cp0 = in0[1];
cpp = in0[1];
} else if ((x == width) && (y == 2)) {
cmm = in0[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
} else if (x == 2) {
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
} else if (y == 2) {
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
} else if (x == width) {
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
} else if (y == height) {
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
} else {
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
}
c00 = in0[1];
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
#else
cmm = ((x == 2) || (y == 2)) ? BLANK_CRB : inm[0];
cm0 = (y == 2) ? BLANK_CRB : inm[1];
cmp = ((x == width) || (y == 2)) ? BLANK_CRB : inm[2];
c0m = (x == 2) ? BLANK_CRB : in0[0];
c00 = in0[1];
c0p = (x == width) ? BLANK_CRB : in0[2];
cpm = ((x == 2) || (y == height)) ? BLANK_CRB : inp[0];
cp0 = (y == height) ? BLANK_CRB : inp[1];
cpp = ((x == width) || (y == height)) ? BLANK_CRB : inp[2];
#endif
inm--;
in0--;
inp--;
*(out1--) = (1*cpp + 3*(cp0+c0p) + 9*c00 + 8) >> 4;
*(out1--) = (1*cpm + 3*(cp0+c0m) + 9*c00 + 8) >> 4;
*(out0--) = (1*cmp + 3*(cm0+c0p) + 9*c00 + 8) >> 4;
*(out0--) = (1*cmm + 3*(cm0+c0m) + 9*c00 + 8) >> 4;
}
out1 -= width;
out0 -= width;
}
}
// lame box filter
// the dampening of high frequencies depend
// on the directions these frequencies occur in the
// image, resulting in clear edges between certain
// group of pixels.
static void ss_420jpeg_to_444(uint8_t *buffer, int width, int height)
{
uint8_t *in, *out0, *out1;
int x, y;
in = buffer + (width * height / 4) - 1;
out1 = buffer + (width * height) - 1;
out0 = out1 - width;
for (y = height - 1; y >= 0; y -= 2) {
for (x = width - 1; x >= 0; x -=2) {
uint8_t val = *(in--);
*(out1--) = val;
*(out1--) = val;
*(out0--) = val;
*(out0--) = val;
}
out0 -= width;
out1 -= width;
}
}
void ss_420_to_422(uint8_t *buffer, int width, int height)
{
//todo, 1x2 super sampling (box)
}
void ss_422_to_420(uint8_t *buffer, int width, int height )
{
//todo 2x1 down sampling (box)
}
static void ss_444_to_422(uint8_t *buffer, int width, int height)
{
int dst_stride = width/2;
int len = width * height;
int x,y;
if(go == 0) subsample_init();
memcpy( sample_buffer, buffer, len );
for(y = 0; y < height; y ++)
{
uint8_t *src = sample_buffer + (y * width);
uint8_t *dst = buffer + (y*dst_stride);
for(x=0; x < dst_stride; x++)
{
*(dst++) = ( src[0] + src[1] ) >> 1;
src += 2;
}
}
}
static void tr_422_to_444(uint8_t *buffer, int width, int height)
{
/* YUV 4:2:2 Planar to 4:4:4 Planar */
int stride = width/2;
int len = stride * height;
int x,y;
int s = 0;
int d = 0;
// super
if(go == 0) subsample_init();
memcpy(sample_buffer, buffer, len );
for(y = 0; y < height; y++)
{
uint8_t *row = sample_buffer + (y*stride); // chroma plane
uint8_t *dst = buffer + (y*width); // destination plane
for(x=0; x < stride; x++) // for 1 row
{
uint8_t c = row[x]; // get pixel
dst[0] = c; //put to dst
dst[1] = c;
dst+=2; // increment dst
d+=2;
s++;
}
}
}
/* vertical intersitial siting; horizontal cositing
*
* Y Y Y Y
* C C
* Y Y Y Y
*
* Y Y Y Y
* C C
* Y Y Y Y
*
* [1,2,1] kernel for horizontal subsampling:
*
* inX[0] [1] [2]
* | | |
* C C C C
* \ | /
* \ | /
* C
*/
static void ss_444_to_420mpeg2(uint8_t *buffer, int width, int height)
{
uint8_t *in0, *in1, *out;
int x, y;
in0 = buffer; /* points to */
in1 = buffer + width; /* second of pair of lines */
out = buffer;
for (y = 0; y < height; y += 2) {
/* first column boundary condition -- just repeat it to right */
*out = (in0[0] + (2 * in0[0]) + in0[1] +
in1[0] + (2 * in1[0]) + in1[1]) >> 3;
out++;
in0++;
in1++;
/* rest of columns just loop */
for (x = 2; x < width; x += 2) {
*out = (in0[0] + (2 * in0[1]) + in0[2] +
in1[0] + (2 * in1[1]) + in1[2]) >> 3;
in0 += 2;
in1 += 2;
out++;
}
in0 += width + 1;
in1 += width + 1;
}
}
void chroma_subsample(subsample_mode_t mode, uint8_t *ycbcr[],
int width, int height)
{
switch (mode) {
case SSM_420_JPEG_BOX:
case SSM_420_JPEG_TR:
ss_444_to_420jpeg(ycbcr[1], width, height);
ss_444_to_420jpeg(ycbcr[2], width, height);
break;
case SSM_420_MPEG2:
ss_444_to_420mpeg2(ycbcr[1], width, height);
ss_444_to_420mpeg2(ycbcr[2], width, height);
break;
case SSM_422_444:
ss_444_to_422(ycbcr[1],width,height);
ss_444_to_422(ycbcr[2],width,height);
break;
case SSM_420_422:
ss_422_to_420(ycbcr[1],width,height);
ss_422_to_420(ycbcr[2],width,height);
break;
default:
break;
}
}
void chroma_supersample(subsample_mode_t mode, uint8_t *ycbcr[],
int width, int height)
{
switch (mode) {
case SSM_420_JPEG_BOX:
ss_420jpeg_to_444(ycbcr[1], width, height);
ss_420jpeg_to_444(ycbcr[2], width, height);
break;
case SSM_420_JPEG_TR:
tr_420jpeg_to_444(ycbcr[1], width, height);
tr_420jpeg_to_444(ycbcr[2], width, height);
break;
case SSM_422_444:
tr_422_to_444(ycbcr[2],width,height);
tr_422_to_444(ycbcr[1],width,height);
// memset( ycbcr[1], 128,(width*height));
// tr_422_to_444(ycbcr[1],width,height);
break;
case SSM_420_422:
ss_420_to_422( ycbcr[1], width, height );
ss_420_to_422( ycbcr[2], width, height );
break;
case SSM_420_MPEG2:
// ss_420mpeg2_to_444(ycbcr[1], width, height);
// ss_420mpeg2_to_444(ycbcr[2], width, height);
exit(4);
break;
default:
break;
}
}
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