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24-bit RGB bitmap to YUV converter

罗索客 发布于 2007-01-08 14:57 点击:次 
/************************************************************************** * * * This code is developed by Adam Li. This software is an * * implementation of a part of one or more MPEG-4 Video tools as * * specified in ISO/IEC 14496-2 standard. Tho
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/**************************************************************************
* *
* This code is developed by Adam Li. This software is an *
* implementation of a part of one or more MPEG-4 Video tools as *
* specified in ISO/IEC 14496-2 standard. Those intending to use this *
* software module in hardware or software products are advised that its *
* use may infringe existing patents or copyrights, and any such use *
* would be at such party's own risk. The original developer of this *
* software module and his/her company, and subsequent editors and their *
* companies (including Project Mayo), will have no liability for use of *
* this software or modifications or derivatives thereof. *
* *
* Project Mayo gives users of the Codec a license to this software *
* module or modifications thereof for use in hardware or software *
* products claiming conformance to the MPEG-4 Video Standard as *
* described in the Open DivX license. *
* *
* The complete Open DivX license can be found at *
* http://www.projectmayo.com/opendivx/license.php . *
* *
**************************************************************************/

/**************************************************************************
*
* rgb2yuv.c, 24-bit RGB bitmap to YUV converter
*
* Copyright (C) 2001 Project Mayo
*
* Adam Li
*
* DivX Advance Research Center <darc@projectmayo.com>
*
**************************************************************************/

/* This file contains RGB to YUV transformation functions. */

#include "stdlib.h"
#include "rgb2yuv.h"

static float RGBYUV02990[256], RGBYUV05870[256], RGBYUV01140[256];
static float RGBYUV01684[256], RGBYUV03316[256];
static float RGBYUV04187[256], RGBYUV00813[256];

void InitLookupTable();

/************************************************************************
*
* int RGB2YUV (int x_dim, int y_dim, void *bmp, YUV *yuv)
*
* Purpose : It takes a 24-bit RGB bitmap and convert it into
* YUV (4:2:0) format
*
* Input : x_dim the x dimension of the bitmap
* y_dim the y dimension of the bitmap
* bmp pointer to the buffer of the bitmap
* yuv pointer to the YUV structure
*
* Output : 0 OK
* 1 wrong dimension
* 2 memory allocation error
*
* Side Effect :
* None
*
* Date : 09/28/2000
*
* Contacts:
*
* Adam Li
*
* DivX Advance Research Center <darc@projectmayo.com>
*
************************************************************************/

int RGB2YUV (int x_dim, int y_dim, void *bmp, void *y_out, void *u_out, void *v_out, int flip)
{
static int init_done = 0;

long i, j, size;
unsigned char *r, *g, *b;
unsigned char *y, *u, *v;
unsigned char *pu1, *pu2, *pv1, *pv2, *psu, *psv;
unsigned char *y_buffer, *u_buffer, *v_buffer;
unsigned char *sub_u_buf, *sub_v_buf;

if (init_done == 0)
{
InitLookupTable();
init_done = 1;
}

// check to see if x_dim and y_dim are divisible by 2
if ((x_dim % 2) || (y_dim % 2)) return 1;
size = x_dim * y_dim;

// allocate memory
y_buffer = (unsigned char *)y_out;
sub_u_buf = (unsigned char *)u_out;
sub_v_buf = (unsigned char *)v_out;
u_buffer = (unsigned char *)malloc(size * sizeof(unsigned char));
v_buffer = (unsigned char *)malloc(size * sizeof(unsigned char));
if (!(u_buffer && v_buffer))
{
if (u_buffer) free(u_buffer);
if (v_buffer) free(v_buffer);
return 2;
}

b = (unsigned char *)bmp;
y = y_buffer;
u = u_buffer;
v = v_buffer;

// convert RGB to YUV
if (!flip) {
for (j = 0; j < y_dim; j ++)
{
y = y_buffer + (y_dim - j - 1) * x_dim;
u = u_buffer + (y_dim - j - 1) * x_dim;
v = v_buffer + (y_dim - j - 1) * x_dim;

for (i = 0; i < x_dim; i ++) {
g = b + 1;
r = b + 2;
*y = (unsigned char)( RGBYUV02990[*r] + RGBYUV05870[*g] + RGBYUV01140[*b]);
*u = (unsigned char)(- RGBYUV01684[*r] - RGBYUV03316[*g] + (*b)/2 + 128);
*v = (unsigned char)( (*r)/2 - RGBYUV04187[*g] - RGBYUV00813[*b] + 128);
b += 3;
y ++;
u ++;
v ++;
}
}
} else {
for (i = 0; i < size; i++)
{
g = b + 1;
r = b + 2;
*y = (unsigned char)( RGBYUV02990[*r] + RGBYUV05870[*g] + RGBYUV01140[*b]);
*u = (unsigned char)(- RGBYUV01684[*r] - RGBYUV03316[*g] + (*b)/2 + 128);
*v = (unsigned char)( (*r)/2 - RGBYUV04187[*g] - RGBYUV00813[*b] + 128);
b += 3;
y ++;
u ++;
v ++;
}
}

// subsample UV
for (j = 0; j < y_dim/2; j ++)
{
psu = sub_u_buf + j * x_dim / 2;
psv = sub_v_buf + j * x_dim / 2;
pu1 = u_buffer + 2 * j * x_dim;
pu2 = u_buffer + (2 * j + 1) * x_dim;
pv1 = v_buffer + 2 * j * x_dim;
pv2 = v_buffer + (2 * j + 1) * x_dim;
for (i = 0; i < x_dim/2; i ++)
{
*psu = (*pu1 + *(pu1+1) + *pu2 + *(pu2+1)) / 4;
*psv = (*pv1 + *(pv1+1) + *pv2 + *(pv2+1)) / 4;
psu ++;
psv ++;
pu1 += 2;
pu2 += 2;
pv1 += 2;
pv2 += 2;
}
}

free(u_buffer);
free(v_buffer);

return 0;
}


void InitLookupTable()
{
int i;

for (i = 0; i < 256; i++) RGBYUV02990[i] = (float)0.2990 * i;
for (i = 0; i < 256; i++) RGBYUV05870[i] = (float)0.5870 * i;
for (i = 0; i < 256; i++) RGBYUV01140[i] = (float)0.1140 * i;
for (i = 0; i < 256; i++) RGBYUV01684[i] = (float)0.1684 * i;
for (i = 0; i < 256; i++) RGBYUV03316[i] = (float)0.3316 * i;
for (i = 0; i < 256; i++) RGBYUV04187[i] = (float)0.4187 * i;
for (i = 0; i < 256; i++) RGBYUV00813[i] = (float)0.0813 * i;
}
(iwgh)
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