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223 lines
8.0 KiB
223 lines
8.0 KiB
/*****************************************************************************
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* yuvp.c: YUVP to YUVA/RGBA chroma converter
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*****************************************************************************
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* Copyright (C) 2008 VLC authors and VideoLAN
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* $Id$
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*
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* Authors: Laurent Aimar < fenrir @ videolan.org >
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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/*****************************************************************************
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* Preamble
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*****************************************************************************/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <vlc_common.h>
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#include <vlc_plugin.h>
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#include <vlc_filter.h>
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#include <vlc_picture.h>
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#include <assert.h>
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/* TODO:
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* Add anti-aliasing support (specially for DVD where only 4 colors are used)
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*/
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/*****************************************************************************
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* Module descriptor
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*****************************************************************************/
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static int Open ( vlc_object_t * );
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static void Close( vlc_object_t * );
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vlc_module_begin ()
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set_description( N_("YUVP converter") )
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set_capability( "video converter", 10 )
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set_callbacks( Open, Close )
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vlc_module_end ()
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/****************************************************************************
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* Local prototypes
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****************************************************************************/
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static picture_t *Filter( filter_t *, picture_t * );
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static void Yuv2Rgb( uint8_t *r, uint8_t *g, uint8_t *b, int y1, int u1, int v1 );
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/*****************************************************************************
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* Open: probe the filter and return score
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*****************************************************************************/
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static int Open( vlc_object_t *p_this )
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{
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filter_t *p_filter = (filter_t*)p_this;
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/* It only supports YUVP to YUVA/RGBA without scaling
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* (if scaling is required another filter can do it) */
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if( p_filter->fmt_in.video.i_chroma != VLC_CODEC_YUVP ||
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( p_filter->fmt_out.video.i_chroma != VLC_CODEC_YUVA &&
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p_filter->fmt_out.video.i_chroma != VLC_CODEC_RGBA &&
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p_filter->fmt_out.video.i_chroma != VLC_CODEC_ARGB ) ||
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p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ||
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p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height ||
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p_filter->fmt_in.video.orientation != p_filter->fmt_out.video.orientation )
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{
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return VLC_EGENERIC;
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}
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p_filter->pf_video_filter = Filter;
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msg_Dbg( p_filter, "YUVP to %4.4s converter",
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(const char*)&p_filter->fmt_out.video.i_chroma );
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return VLC_SUCCESS;
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}
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/*****************************************************************************
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* Close: clean up the filter
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*****************************************************************************/
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static void Close( vlc_object_t *p_this )
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{
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VLC_UNUSED(p_this );
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}
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/****************************************************************************
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* Filter: the whole thing
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****************************************************************************/
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static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
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{
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picture_t *p_out;
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if( !p_pic )
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return NULL;
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const video_palette_t *p_yuvp = p_filter->fmt_in.video.p_palette;
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assert( p_yuvp != NULL );
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assert( p_filter->fmt_in.video.i_chroma == VLC_CODEC_YUVP );
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assert( p_filter->fmt_in.video.i_width == p_filter->fmt_out.video.i_width );
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assert( p_filter->fmt_in.video.i_height == p_filter->fmt_out.video.i_height );
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/* Request output picture */
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p_out = filter_NewPicture( p_filter );
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if( !p_out )
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{
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picture_Release( p_pic );
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return NULL;
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}
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if( p_filter->fmt_out.video.i_chroma == VLC_CODEC_YUVA )
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{
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for( unsigned int y = 0; y < p_filter->fmt_in.video.i_height; y++ )
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{
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const uint8_t *p_line = &p_pic->p->p_pixels[y*p_pic->p->i_pitch];
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uint8_t *p_y = &p_out->Y_PIXELS[y*p_out->Y_PITCH];
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uint8_t *p_u = &p_out->U_PIXELS[y*p_out->U_PITCH];
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uint8_t *p_v = &p_out->V_PIXELS[y*p_out->V_PITCH];
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uint8_t *p_a = &p_out->A_PIXELS[y*p_out->A_PITCH];
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for( unsigned int x = 0; x < p_filter->fmt_in.video.i_width; x++ )
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{
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const int v = p_line[x];
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if( v > p_yuvp->i_entries ) /* maybe assert ? */
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continue;
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p_y[x] = p_yuvp->palette[v][0];
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p_u[x] = p_yuvp->palette[v][1];
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p_v[x] = p_yuvp->palette[v][2];
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p_a[x] = p_yuvp->palette[v][3];
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}
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}
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}
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else
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{
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video_palette_t rgbp;
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assert( p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ||
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p_filter->fmt_out.video.i_chroma == VLC_CODEC_RGBA );
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/* Create a RGBA palette */
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rgbp.i_entries = p_yuvp->i_entries;
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const uint8_t r = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 1 : 0;
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const uint8_t g = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 2 : 1;
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const uint8_t b = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 3 : 2;
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const uint8_t a = p_filter->fmt_out.video.i_chroma == VLC_CODEC_ARGB ? 0 : 3;
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for( int i = 0; i < p_yuvp->i_entries; i++ )
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{
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if( p_yuvp->palette[i][3] == 0 )
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{
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memset( rgbp.palette[i], 0, sizeof( rgbp.palette[i] ) );
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continue;
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}
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Yuv2Rgb( &rgbp.palette[i][r], &rgbp.palette[i][g], &rgbp.palette[i][b],
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p_yuvp->palette[i][0], p_yuvp->palette[i][1], p_yuvp->palette[i][2] );
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rgbp.palette[i][a] = p_yuvp->palette[i][3];
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}
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for( unsigned int y = 0; y < p_filter->fmt_in.video.i_height; y++ )
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{
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const uint8_t *p_line = &p_pic->p->p_pixels[y*p_pic->p->i_pitch];
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uint8_t *p_pixels = &p_out->p->p_pixels[y*p_out->p->i_pitch];
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for( unsigned int x = 0; x < p_filter->fmt_in.video.i_width; x++ )
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{
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const int v = p_line[x];
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if( v >= rgbp.i_entries ) /* maybe assert ? */
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continue;
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p_pixels[4*x+0] = rgbp.palette[v][0];
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p_pixels[4*x+1] = rgbp.palette[v][1];
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p_pixels[4*x+2] = rgbp.palette[v][2];
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p_pixels[4*x+3] = rgbp.palette[v][3];
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}
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}
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}
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picture_CopyProperties( p_out, p_pic );
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picture_Release( p_pic );
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return p_out;
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}
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/* FIXME copied from blend.c */
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static inline uint8_t vlc_uint8( int v )
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{
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if( v > 255 )
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return 255;
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else if( v < 0 )
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return 0;
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return v;
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}
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static void Yuv2Rgb( uint8_t *r, uint8_t *g, uint8_t *b, int y1, int u1, int v1 )
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{
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/* macros used for YUV pixel conversions */
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# define SCALEBITS 10
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# define ONE_HALF (1 << (SCALEBITS - 1))
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# define FIX(x) ((int) ((x) * (1<<SCALEBITS) + 0.5))
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int y, cb, cr, r_add, g_add, b_add;
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cb = u1 - 128;
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cr = v1 - 128;
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r_add = FIX(1.40200*255.0/224.0) * cr + ONE_HALF;
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g_add = - FIX(0.34414*255.0/224.0) * cb
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- FIX(0.71414*255.0/224.0) * cr + ONE_HALF;
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b_add = FIX(1.77200*255.0/224.0) * cb + ONE_HALF;
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y = (y1 - 16) * FIX(255.0/219.0);
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*r = vlc_uint8( (y + r_add) >> SCALEBITS );
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*g = vlc_uint8( (y + g_add) >> SCALEBITS );
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*b = vlc_uint8( (y + b_add) >> SCALEBITS );
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#undef FIX
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}
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