Staging
v0.5.1
v0.5.1
Revision f1b94134a4b879bc55c3dacdb496690c8ebdc03f authored by Vikram Fugro on 11 March 2016, 12:16:11 UTC, committed by Jean-Baptiste Kempf on 11 March 2016, 14:57:34 UTC
Allocate the output vlc pictures with dimensions padded, as requested by the decoder (for alignments). This further increases the chances of direct rendering. Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>
1 parent 6c813cb
i420_rgb8.c
/*****************************************************************************
* i420_rgb8.c : YUV to bitmap RGB conversion module for vlc
*****************************************************************************
* Copyright (C) 2000 VLC authors and VideoLAN
* $Id$
*
* 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 Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
*****************************************************************************/
/*****************************************************************************
* Preamble
*****************************************************************************/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <vlc_common.h>
#include <vlc_filter.h>
#include "i420_rgb.h"
#include "i420_rgb_c.h"
static void SetOffset( int, int, int, int, bool *, int *, int * );
/*****************************************************************************
* I420_RGB8: color YUV 4:2:0 to RGB 8 bpp
*****************************************************************************/
void I420_RGB8( filter_t *p_filter, picture_t *p_src, picture_t *p_dest )
{
/* We got this one from the old arguments */
uint8_t *p_pic = (uint8_t*)p_dest->p->p_pixels;
uint8_t *p_y = p_src->Y_PIXELS;
uint8_t *p_u = p_src->U_PIXELS;
uint8_t *p_v = p_src->V_PIXELS;
bool b_hscale; /* horizontal scaling type */
int i_vscale; /* vertical scaling type */
unsigned int i_x, i_y; /* horizontal and vertical indexes */
unsigned int i_real_y; /* y % 4 */
int i_right_margin;
int i_scale_count; /* scale modulo counter */
unsigned int i_chroma_width = (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width) / 2;/* chroma width */
/* Lookup table */
uint8_t * p_lookup = p_filter->p_sys->p_base;
/* Offset array pointer */
int * p_offset_start = p_filter->p_sys->p_offset;
int * p_offset;
const int i_source_margin = p_src->p[0].i_pitch
- p_src->p[0].i_visible_pitch
- p_filter->fmt_in.video.i_x_offset;
const int i_source_margin_c = p_src->p[1].i_pitch
- p_src->p[1].i_visible_pitch
- ( p_filter->fmt_in.video.i_x_offset / 2 );
/* The dithering matrices */
static const int dither10[4] = { 0x0, 0x8, 0x2, 0xa };
static const int dither11[4] = { 0xc, 0x4, 0xe, 0x6 };
static const int dither12[4] = { 0x3, 0xb, 0x1, 0x9 };
static const int dither13[4] = { 0xf, 0x7, 0xd, 0x5 };
static const int dither20[4] = { 0x0, 0x10, 0x4, 0x14 };
static const int dither21[4] = { 0x18, 0x8, 0x1c, 0xc };
static const int dither22[4] = { 0x6, 0x16, 0x2, 0x12 };
static const int dither23[4] = { 0x1e, 0xe, 0x1a, 0xa };
SetOffset( (p_filter->fmt_in.video.i_x_offset + p_filter->fmt_in.video.i_visible_width),
(p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height),
(p_filter->fmt_out.video.i_x_offset + p_filter->fmt_out.video.i_visible_width),
(p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height),
&b_hscale, &i_vscale, p_offset_start );
i_right_margin = p_dest->p->i_pitch - p_dest->p->i_visible_pitch;
/*
* Perform conversion
*/
i_scale_count = ( i_vscale == 1 ) ?
(p_filter->fmt_out.video.i_y_offset + p_filter->fmt_out.video.i_visible_height) :
(p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height);
for( i_y = 0, i_real_y = 0; i_y < (p_filter->fmt_in.video.i_y_offset + p_filter->fmt_in.video.i_visible_height); i_y++ )
{
/* Do horizontal and vertical scaling */
SCALE_WIDTH_DITHER( 420 );
SCALE_HEIGHT_DITHER( 420 );
}
p_y += i_source_margin;
if( i_y % 2 )
{
p_u += i_source_margin_c;
p_v += i_source_margin_c;
}
}
/* Following functions are local */
/*****************************************************************************
* SetOffset: build offset array for conversion functions
*****************************************************************************
* This function will build an offset array used in later conversion functions.
* It will also set horizontal and vertical scaling indicators. The p_offset
* structure has interleaved Y and U/V offsets.
*****************************************************************************/
static void SetOffset( int i_width, int i_height, int i_pic_width,
int i_pic_height, bool *pb_hscale,
int *pi_vscale, int *p_offset )
{
int i_x; /* x position in destination */
int i_scale_count; /* modulo counter */
/*
* Prepare horizontal offset array
*/
if( i_pic_width - i_width == 0 )
{
/* No horizontal scaling: YUV conversion is done directly to picture */
*pb_hscale = 0;
}
else if( i_pic_width - i_width > 0 )
{
int i_dummy = 0;
/* Prepare scaling array for horizontal extension */
*pb_hscale = 1;
i_scale_count = i_pic_width;
for( i_x = i_width; i_x--; )
{
while( (i_scale_count -= i_width) > 0 )
{
*p_offset++ = 0;
*p_offset++ = 0;
}
*p_offset++ = 1;
*p_offset++ = i_dummy;
i_dummy = 1 - i_dummy;
i_scale_count += i_pic_width;
}
}
else /* if( i_pic_width - i_width < 0 ) */
{
int i_remainder = 0;
int i_jump;
/* Prepare scaling array for horizontal reduction */
*pb_hscale = 1;
i_scale_count = i_width;
for( i_x = i_pic_width; i_x--; )
{
i_jump = 1;
while( (i_scale_count -= i_pic_width) > 0 )
{
i_jump += 1;
}
*p_offset++ = i_jump;
*p_offset++ = ( i_jump += i_remainder ) >> 1;
i_remainder = i_jump & 1;
i_scale_count += i_width;
}
}
/*
* Set vertical scaling indicator
*/
if( i_pic_height - i_height == 0 )
{
*pi_vscale = 0;
}
else if( i_pic_height - i_height > 0 )
{
*pi_vscale = 1;
}
else /* if( i_pic_height - i_height < 0 ) */
{
*pi_vscale = -1;
}
}
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