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/*****************************************************************************
* i420_rgb.c : YUV to bitmap RGB conversion module for vlc
*****************************************************************************
* Copyright (C) 2000, 2001 VideoLAN
* $Id: i420_rgb.c,v 1.6 2002/03/16 23:03:19 sam Exp $
*
* Authors: Samuel Hocevar <sam@zoy.org>
*
* 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.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#include <math.h> /* exp(), pow() */
#include <errno.h> /* ENOMEM */
#include <string.h> /* strerror() */
#include <stdlib.h> /* malloc(), free() */
#include <videolan/vlc.h>
#include "video.h"
#include "video_output.h"
#include "i420_rgb.h"
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
# include "i420_rgb_c.h"
#endif
/*****************************************************************************
* Local and extern prototypes.
*****************************************************************************/
static void chroma_getfunctions ( function_list_t * p_function_list );
static int chroma_Init ( vout_thread_t *p_vout );
static void chroma_End ( vout_thread_t *p_vout );
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
static void SetGammaTable ( int *pi_table, double f_gamma );
static void SetYUV ( vout_thread_t *p_vout );
#endif
/*****************************************************************************
* Build configuration tree.
*****************************************************************************/
MODULE_CONFIG_START
MODULE_CONFIG_STOP
MODULE_INIT_START
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
SET_DESCRIPTION( "I420,IYUV,YV12 to RGB,RV15,RV16,RV24,RV32 conversions" )
ADD_CAPABILITY( CHROMA, 80 )
#elif defined (MODULE_NAME_IS_chroma_i420_rgb_mmx)
SET_DESCRIPTION( "MMX I420,IYUV,YV12 to RV15,RV16,RV24,RV32 conversions" )
ADD_CAPABILITY( CHROMA, 100 )
ADD_REQUIREMENT( MMX )
#endif
MODULE_INIT_STOP
MODULE_ACTIVATE_START
chroma_getfunctions( &p_module->p_functions->chroma );
MODULE_ACTIVATE_STOP
MODULE_DEACTIVATE_START
MODULE_DEACTIVATE_STOP
/*****************************************************************************
* Functions exported as capabilities. They are declared as static so that
* we don't pollute the namespace too much.
*****************************************************************************/
static void chroma_getfunctions( function_list_t * p_function_list )
{
p_function_list->functions.chroma.pf_init = chroma_Init;
p_function_list->functions.chroma.pf_end = chroma_End;
}
/*****************************************************************************
* chroma_Init: allocate a chroma function
*****************************************************************************
* This function allocates and initializes a chroma function
*****************************************************************************/
static int chroma_Init( vout_thread_t *p_vout )
{
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
size_t i_tables_size;
#endif
if( p_vout->render.i_width & 1 || p_vout->render.i_height & 1 )
{
return -1;
}
switch( p_vout->render.i_chroma )
{
case FOURCC_YV12:
case FOURCC_I420:
case FOURCC_IYUV:
switch( p_vout->output.i_chroma )
{
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
case FOURCC_RGB:
p_vout->chroma.pf_convert = _M( I420_RGB8 );
break;
#endif
case FOURCC_RV15:
p_vout->chroma.pf_convert = _M( I420_RGB15 );
break;
case FOURCC_RV16:
p_vout->chroma.pf_convert = _M( I420_RGB16 );
break;
case FOURCC_RV32:
p_vout->chroma.pf_convert = _M( I420_RGB32 );
break;
default:
return -1;
}
break;
default:
return -1;
}
p_vout->chroma.p_sys = malloc( sizeof( chroma_sys_t ) );
if( p_vout->chroma.p_sys == NULL )
{
return -1;
}
switch( p_vout->output.i_chroma )
{
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
case FOURCC_RGB:
p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
break;
#endif
case FOURCC_RV15:
case FOURCC_RV16:
p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
break;
case FOURCC_RV32:
p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 4 );
break;
default:
p_vout->chroma.p_sys->p_buffer = NULL;
break;
}
if( p_vout->chroma.p_sys->p_buffer == NULL )
{
free( p_vout->chroma.p_sys );
return -1;
}
p_vout->chroma.p_sys->p_offset = malloc( p_vout->output.i_width
* sizeof( int ) );
if( p_vout->chroma.p_sys->p_offset == NULL )
{
free( p_vout->chroma.p_sys->p_buffer );
free( p_vout->chroma.p_sys );
return -1;
}
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
switch( p_vout->output.i_chroma )
{
case FOURCC_RGB:
i_tables_size = sizeof( u8 ) * PALETTE_TABLE_SIZE;
break;
case FOURCC_RV15:
case FOURCC_RV16:
i_tables_size = sizeof( u16 ) * RGB_TABLE_SIZE;
break;
default: /* RV24, RV32 */
i_tables_size = sizeof( u32 ) * RGB_TABLE_SIZE;
break;
}
p_vout->chroma.p_sys->p_base = malloc( i_tables_size );
if( p_vout->chroma.p_sys->p_base == NULL )
{
free( p_vout->chroma.p_sys->p_offset );
free( p_vout->chroma.p_sys->p_buffer );
free( p_vout->chroma.p_sys );
return -1;
}
SetYUV( p_vout );
#endif
return 0;
}
/*****************************************************************************
* chroma_End: free the chroma function
*****************************************************************************
* This function frees the previously allocated chroma function
*****************************************************************************/
static void chroma_End( vout_thread_t *p_vout )
{
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
free( p_vout->chroma.p_sys->p_base );
#endif
free( p_vout->chroma.p_sys->p_offset );
free( p_vout->chroma.p_sys->p_buffer );
free( p_vout->chroma.p_sys );
}
#if defined (MODULE_NAME_IS_chroma_i420_rgb)
/*****************************************************************************
* SetGammaTable: return intensity table transformed by gamma curve.
*****************************************************************************
* pi_table is a table of 256 entries from 0 to 255.
*****************************************************************************/
static void SetGammaTable( int *pi_table, double f_gamma )
{
int i_y; /* base intensity */
/* Use exp(gamma) instead of gamma */
f_gamma = exp( f_gamma );
/* Build gamma table */
for( i_y = 0; i_y < 256; i_y++ )
{
pi_table[ i_y ] = pow( (double)i_y / 256, f_gamma ) * 256;
}
}
/*****************************************************************************
* SetYUV: compute tables and set function pointers
*****************************************************************************/
static void SetYUV( vout_thread_t *p_vout )
{
int pi_gamma[256]; /* gamma table */
int i_index; /* index in tables */
/* Build gamma table */
SetGammaTable( pi_gamma, p_vout->f_gamma );
/*
* Set pointers and build YUV tables
*/
/* Color: build red, green and blue tables */
switch( p_vout->output.i_chroma )
{
case FOURCC_RGB:
{
#define RGB_MIN 0
#define RGB_MAX 255
#define CLIP( x ) ( ((x < 0) ? 0 : (x > 255) ? 255 : x) << 8 )
int y,u,v;
int r,g,b;
int uvr, uvg, uvb;
int i = 0, j = 0;
u16 red[256], green[256], blue[256], transp[256];
unsigned char lookup[PALETTE_TABLE_SIZE];
p_vout->chroma.p_sys->yuv.p_rgb8 = (u8 *)p_vout->chroma.p_sys->p_base;
/* this loop calculates the intersection of an YUV box
* and the RGB cube. */
for ( y = 0; y <= 256; y += 16 )
{
for ( u = 0; u <= 256; u += 32 )
for ( v = 0; v <= 256; v += 32 )
{
uvr = (V_RED_COEF*(v-128)) >> SHIFT;
uvg = (U_GREEN_COEF*(u-128) + V_GREEN_COEF*(v-128)) >> SHIFT;
uvb = (U_BLUE_COEF*(u-128)) >> SHIFT;
r = y + uvr;
g = y + uvg;
b = y + uvb;
if( r >= RGB_MIN && g >= RGB_MIN && b >= RGB_MIN
&& r <= RGB_MAX && g <= RGB_MAX && b <= RGB_MAX )
{
/* this one should never happen unless someone fscked up my code */
if(j == 256) { intf_ErrMsg( "vout error: no colors left to build palette" ); break; }
/* clip the colors */
red[j] = CLIP( r );
green[j] = CLIP( g );
blue[j] = CLIP( b );
transp[j] = 0;
/* allocate color */
lookup[i] = 1;
p_vout->chroma.p_sys->yuv.p_rgb8[i++] = j;
j++;
}
else
{
lookup[i] = 0;
p_vout->chroma.p_sys->yuv.p_rgb8[i++] = 0;
}
}
i += 128-81;
}
/* the colors have been allocated, we can set the palette */
/* there will eventually be a way to know which colors
* couldn't be allocated and try to find a replacement */
#if 0
p_vout->pf_setpalette( p_vout, red, green, blue, transp );
p_vout->i_white_pixel = 0xff;
p_vout->i_black_pixel = 0x00;
p_vout->i_gray_pixel = 0x44;
p_vout->i_blue_pixel = 0x3b;
#endif
i = 0;
/* this loop allocates colors that got outside
* the RGB cube */
for ( y = 0; y <= 256; y += 16 )
{
for ( u = 0; u <= 256; u += 32 )
for ( v = 0; v <= 256; v += 32 )
{
int u2, v2;
int dist, mindist = 100000000;
if( lookup[i] || y==0)
{
i++;
continue;
}
/* heavy. yeah. */
for( u2 = 0; u2 <= 256; u2 += 32 )
for( v2 = 0; v2 <= 256; v2 += 32 )
{
j = ((y>>4)<<7) + (u2>>5)*9 + (v2>>5);
dist = (u-u2)*(u-u2) + (v-v2)*(v-v2);
if( lookup[j] )
/* find the nearest color */
if( dist < mindist )
{
p_vout->chroma.p_sys->yuv.p_rgb8[i] = p_vout->chroma.p_sys->yuv.p_rgb8[j];
mindist = dist;
}
j -= 128;
if( lookup[j] )
/* find the nearest color */
if( dist + 128 < mindist )
{
p_vout->chroma.p_sys->yuv.p_rgb8[i] = p_vout->chroma.p_sys->yuv.p_rgb8[j];
mindist = dist + 128;
}
}
i++;
}
i += 128-81;
}
}
break;
case FOURCC_RV15:
case FOURCC_RV16:
p_vout->chroma.p_sys->yuv.p_rgb16 = (u16 *)p_vout->chroma.p_sys->p_base;
for( i_index = 0; i_index < RED_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb16[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
p_vout->chroma.p_sys->yuv.p_rgb16[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
}
for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb16[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
p_vout->chroma.p_sys->yuv.p_rgb16[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
}
for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb16[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
p_vout->chroma.p_sys->yuv.p_rgb16[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
}
for( i_index = 0; i_index < 256; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb16[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
p_vout->chroma.p_sys->yuv.p_rgb16[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
p_vout->chroma.p_sys->yuv.p_rgb16[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
}
break;
case FOURCC_RV24:
case FOURCC_RV32:
p_vout->chroma.p_sys->yuv.p_rgb32 = (u32 *)p_vout->chroma.p_sys->p_base;
for( i_index = 0; i_index < RED_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb32[RED_OFFSET - RED_MARGIN + i_index] = RGB2PIXEL( p_vout, pi_gamma[0], 0, 0 );
p_vout->chroma.p_sys->yuv.p_rgb32[RED_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, pi_gamma[255], 0, 0 );
}
for( i_index = 0; i_index < GREEN_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb32[GREEN_OFFSET - GREEN_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[0], 0 );
p_vout->chroma.p_sys->yuv.p_rgb32[GREEN_OFFSET + 256 + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[255], 0 );
}
for( i_index = 0; i_index < BLUE_MARGIN; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb32[BLUE_OFFSET - BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[0] );
p_vout->chroma.p_sys->yuv.p_rgb32[BLUE_OFFSET + BLUE_MARGIN + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[255] );
}
for( i_index = 0; i_index < 256; i_index++ )
{
p_vout->chroma.p_sys->yuv.p_rgb32[RED_OFFSET + i_index] = RGB2PIXEL( p_vout, pi_gamma[ i_index ], 0, 0 );
p_vout->chroma.p_sys->yuv.p_rgb32[GREEN_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, pi_gamma[ i_index ], 0 );
p_vout->chroma.p_sys->yuv.p_rgb32[BLUE_OFFSET + i_index] = RGB2PIXEL( p_vout, 0, 0, pi_gamma[ i_index ] );
}
break;
}
}
#endif