📄 csp.c
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/*****************************************************************************
* csp.c: h264 encoder library
*****************************************************************************
* Copyright (C) 2004 Laurent Aimar
* $Id: csp.c,v 1.1 2004/06/03 19:27:06 fenrir Exp $
*
* Authors: Laurent Aimar <fenrir@via.ecp.fr>
*
* 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, USA.
*****************************************************************************/
#include <stdio.h>
#include <string.h>
#include "common.h"
static inline void plane_copy( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
for( ; h > 0; h-- )
{
memcpy( dst, src, w );
dst += i_dst;
src += i_src;
}
}
static inline void plane_copy_vflip( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
plane_copy( dst, i_dst, src + (h -1)*i_src, -i_src, w, h );
}
static inline void plane_subsamplev2( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
for( ; h > 0; h-- )
{
uint8_t *d = dst;
uint8_t *s = src;
int i;
for( i = 0; i < w; i++ )
{
*d++ = ( s[0] + s[i_src] + 1 ) >> 1;
s++;
}
dst += i_dst;
src += 2 * i_src;
}
}
static inline void plane_subsamplev2_vlip( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
plane_subsamplev2( dst, i_dst, src + (2*h-1)*i_src, -i_src, w, h );
}
static inline void plane_subsamplehv2( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
for( ; h > 0; h-- )
{
uint8_t *d = dst;
uint8_t *s = src;
int i;
for( i = 0; i < w; i++ )
{
*d++ = ( s[0] + s[1] + s[i_src] + s[i_src+1] + 1 ) >> 2;
s += 2;
}
dst += i_dst;
src += 2 * i_src;
}
}
static inline void plane_subsamplehv2_vlip( uint8_t *dst, int i_dst,
uint8_t *src, int i_src, int w, int h)
{
plane_subsamplehv2( dst, i_dst, src + (2*h-1)*i_src, -i_src, w, h );
}
static void i420_to_i420( x264_frame_t *frm, x264_image_t *img,
int i_width, int i_height )
{
if( img->i_csp & X264_CSP_VFLIP )
{
plane_copy_vflip( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_copy_vflip( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_copy_vflip( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
else
{
plane_copy( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_copy( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_copy( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
}
static void yv12_to_i420( x264_frame_t *frm, x264_image_t *img,
int i_width, int i_height )
{
if( img->i_csp & X264_CSP_VFLIP )
{
plane_copy_vflip( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_copy_vflip( frm->plane[2], frm->i_stride[2],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_copy_vflip( frm->plane[1], frm->i_stride[1],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
else
{
plane_copy( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_copy( frm->plane[2], frm->i_stride[2],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_copy( frm->plane[1], frm->i_stride[1],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
}
static void i422_to_i420( x264_frame_t *frm, x264_image_t *img,
int i_width, int i_height )
{
if( img->i_csp & X264_CSP_VFLIP )
{
plane_copy_vflip( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_subsamplev2_vlip( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_subsamplev2_vlip( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
else
{
plane_copy( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_subsamplev2( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_subsamplev2( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
}
static void i444_to_i420( x264_frame_t *frm, x264_image_t *img,
int i_width, int i_height )
{
if( img->i_csp & X264_CSP_VFLIP )
{
plane_copy_vflip( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_subsamplehv2_vlip( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_subsamplehv2_vlip( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
else
{
plane_copy( frm->plane[0], frm->i_stride[0],
img->plane[0], img->i_stride[0],
i_width, i_height );
plane_subsamplehv2( frm->plane[1], frm->i_stride[1],
img->plane[1], img->i_stride[1],
i_width / 2, i_height / 2 );
plane_subsamplehv2( frm->plane[2], frm->i_stride[2],
img->plane[2], img->i_stride[2],
i_width / 2, i_height / 2 );
}
}
static void yuyv_to_i420( x264_frame_t *frm, x264_image_t *img,
int i_width, int i_height )
{
uint8_t *src = img->plane[0];
int i_src= img->i_stride[0];
uint8_t *y = frm->plane[0];
uint8_t *u = frm->plane[1];
uint8_t *v = frm->plane[2];
if( img->i_csp & X264_CSP_VFLIP )
{
src += ( i_height - 1 ) * i_src;
i_src = -i_src;
}
for( ; i_height > 0; i_height -= 2 )
{
uint8_t *ss = src;
uint8_t *yy = y;
uint8_t *uu = u;
uint8_t *vv = v;
int w;
for( w = i_width; w > 0; w -= 2 )
{
*yy++ = ss[0];
*yy++ = ss[2];
*uu++ = ( ss[1] + ss[1+i_src] + 1 ) >> 1;
*vv++ = ( ss[3] + ss[3+i_src] + 1 ) >> 1;
ss += 4;
}
src += i_src;
y += frm->i_stride[0];
u += frm->i_stride[1];
v += frm->i_stride[2];
ss = src;
yy = y;
for( w = i_width; w > 0; w -= 2 )
{
*yy++ = ss[0];
*yy++ = ss[2];
ss += 4;
}
src += i_src;
y += frm->i_stride[0];
}
}
/* Same value than in XviD */
#define BITS 8
#define FIX(f) ((int)((f) * (1 << BITS) + 0.5))
#define Y_R FIX(0.257)
#define Y_G FIX(0.504)
#define Y_B FIX(0.098)
#define Y_ADD 16
#define U_R FIX(0.148)
#define U_G FIX(0.291)
#define U_B FIX(0.439)
#define U_ADD 128
#define V_R FIX(0.439)
#define V_G FIX(0.368)
#define V_B FIX(0.071)
#define V_ADD 128
#define RGB_TO_I420( name, POS_R, POS_G, POS_B, S_RGB ) \
static void name( x264_frame_t *frm, x264_image_t *img, \
int i_width, int i_height ) \
{ \
uint8_t *src = img->plane[0]; \
int i_src= img->i_stride[0]; \
int i_y = frm->i_stride[0]; \
uint8_t *y = frm->plane[0]; \
uint8_t *u = frm->plane[1]; \
uint8_t *v = frm->plane[2]; \
\
if( img->i_csp & X264_CSP_VFLIP ) \
{ \
src += ( i_height - 1 ) * i_src; \
i_src = -i_src; \
} \
\
for( ; i_height > 0; i_height -= 2 ) \
{ \
uint8_t *ss = src; \
uint8_t *yy = y; \
uint8_t *uu = u; \
uint8_t *vv = v; \
int w; \
\
for( w = i_width; w > 0; w -= 2 ) \
{ \
int cr = 0,cg = 0,cb = 0; \
int r, g, b; \
\
/* Luma */ \
cr = r = ss[POS_R]; \
cg = g = ss[POS_G]; \
cb = b = ss[POS_B]; \
\
yy[0] = Y_ADD + ((Y_R * r + Y_G * g + Y_B * b) >> BITS); \
\
cr+= r = ss[POS_R+i_src]; \
cg+= g = ss[POS_G+i_src]; \
cb+= b = ss[POS_B+i_src]; \
yy[i_y] = Y_ADD + ((Y_R * r + Y_G * g + Y_B * b) >> BITS); \
yy++; \
ss += S_RGB; \
\
cr+= r = ss[POS_R]; \
cg+= g = ss[POS_G]; \
cb+= b = ss[POS_B]; \
\
yy[0] = Y_ADD + ((Y_R * r + Y_G * g + Y_B * b) >> BITS); \
\
cr+= r = ss[POS_R+i_src]; \
cg+= g = ss[POS_G+i_src]; \
cb+= b = ss[POS_B+i_src]; \
yy[i_y] = Y_ADD + ((Y_R * r + Y_G * g + Y_B * b) >> BITS); \
yy++; \
ss += S_RGB; \
\
/* Chroma */ \
*uu++ = (uint8_t)(U_ADD + ((-U_R * cr - U_G * cg + U_B * cb) >> (BITS+2)) ); \
*vv++ = (uint8_t)(V_ADD + (( V_R * cr - V_G * cg - V_B * cb) >> (BITS+2)) ); \
} \
\
src += 2*i_src; \
y += 2*frm->i_stride[0]; \
u += frm->i_stride[1]; \
v += frm->i_stride[2]; \
} \
}
RGB_TO_I420( rgb_to_i420, 0, 1, 2, 3 );
RGB_TO_I420( bgr_to_i420, 2, 1, 0, 3 );
RGB_TO_I420( bgra_to_i420, 2, 1, 0, 4 );
void x264_csp_init( int cpu, int i_csp, x264_csp_function_t *pf )
{
switch( i_csp )
{
case X264_CSP_I420:
pf->i420 = i420_to_i420;
pf->i422 = i422_to_i420;
pf->i444 = i444_to_i420;
pf->yv12 = yv12_to_i420;
pf->yuyv = yuyv_to_i420;
pf->rgb = rgb_to_i420;
pf->bgr = bgr_to_i420;
pf->bgra = bgra_to_i420;
break;
default:
/* For now, can't happen */
fprintf( stderr, "arg in x264_csp_init\n" );
exit( -1 );
break;
}
}
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