i420_rgb.c

video linux conference

/*****************************************************************************
 * i420_rgb.c : YUV to bitmap RGB conversion module for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001, 2004 VideoLAN
 * $Id: i420_rgb.c 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Author: Sam Hocevar <[e-mail]>
 *
 * 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 <string.h>                                            /* strerror() */
#include <stdlib.h>                                      /* malloc(), free() */

#include <vlc/vlc.h>
#include <vlc/vout.h>

#include "i420_rgb.h"
#if defined (MODULE_NAME_IS_i420_rgb)
#   include "i420_rgb_c.h"
#endif

/*****************************************************************************
 * RGB2PIXEL: assemble RGB components to a pixel value, returns a uint32_t
 *****************************************************************************/
#define RGB2PIXEL( p_vout, i_r, i_g, i_b )          \
    (((((uint32_t)i_r) >> p_vout->output.i_rrshift) \
                       << p_vout->output.i_lrshift) \
   | ((((uint32_t)i_g) >> p_vout->output.i_rgshift) \
                       << p_vout->output.i_lgshift) \
   | ((((uint32_t)i_b) >> p_vout->output.i_rbshift) \
                       << p_vout->output.i_lbshift))

/*****************************************************************************
 * Local and extern prototypes.
 *****************************************************************************/
static int  Activate   ( vlc_object_t * );
static void Deactivate ( vlc_object_t * );

#if defined (MODULE_NAME_IS_i420_rgb)
static void SetGammaTable       ( int *pi_table, double f_gamma );
static void SetYUV              ( vout_thread_t * );
static void Set8bppPalette      ( vout_thread_t *, uint8_t * );
#endif

/*****************************************************************************
 * Module descriptor.
 *****************************************************************************/
vlc_module_begin();
#if defined (MODULE_NAME_IS_i420_rgb)
    set_description( _("I420,IYUV,YV12 to "
                       "RGB2,RV15,RV16,RV24,RV32 conversions") );
    set_capability( "chroma", 80 );
#elif defined (MODULE_NAME_IS_i420_rgb_mmx)
    set_description( _( "MMX I420,IYUV,YV12 to "
                        "RV15,RV16,RV24,RV32 conversions") );
    set_capability( "chroma", 100 );
    add_requirement( MMX );
#endif
    set_callbacks( Activate, Deactivate );
vlc_module_end();

/*****************************************************************************
 * Activate: allocate a chroma function
 *****************************************************************************
 * This function allocates and initializes a chroma function
 *****************************************************************************/
static int Activate( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
#if defined (MODULE_NAME_IS_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 VLC_FOURCC('Y','V','1','2'):
        case VLC_FOURCC('I','4','2','0'):
        case VLC_FOURCC('I','Y','U','V'):
            switch( p_vout->output.i_chroma )
            {
#if defined (MODULE_NAME_IS_i420_rgb)
                case VLC_FOURCC('R','G','B','2'):
                    p_vout->chroma.pf_convert = E_(I420_RGB8);
                    break;
#endif
                case VLC_FOURCC('R','V','1','5'):
                case VLC_FOURCC('R','V','1','6'):
#if defined (MODULE_NAME_IS_i420_rgb_mmx)
                    /* If we don't have support for the bitmasks, bail out */
                    if( ( p_vout->output.i_rmask != 0x7c00
                           || p_vout->output.i_gmask != 0x03e0
                           || p_vout->output.i_bmask != 0x001f )
                     && ( p_vout->output.i_rmask != 0xf800
                           || p_vout->output.i_gmask != 0x07e0
                           || p_vout->output.i_bmask != 0x001f ) )
                    {
                        return -1;
                    }
#endif
                    p_vout->chroma.pf_convert = E_(I420_RGB16);
                    break;

#if 0
                /* Hmmm, is there only X11 using 32bits per pixel for RV24 ? */
                case VLC_FOURCC('R','V','2','4'):
#endif

                case VLC_FOURCC('R','V','3','2'):
#if defined (MODULE_NAME_IS_i420_rgb_mmx)
                    /* If we don't have support for the bitmasks, bail out */
                    if( p_vout->output.i_rmask != 0x00ff0000
                         || p_vout->output.i_gmask != 0x0000ff00
                         || p_vout->output.i_bmask != 0x000000ff )
                    {
                        return -1;
                    }
#endif
                    p_vout->chroma.pf_convert = E_(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_i420_rgb)
        case VLC_FOURCC('R','G','B','2'):
            p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH );
            break;
#endif

        case VLC_FOURCC('R','V','1','5'):
        case VLC_FOURCC('R','V','1','6'):
            p_vout->chroma.p_sys->p_buffer = malloc( VOUT_MAX_WIDTH * 2 );
            break;

        case VLC_FOURCC('R','V','2','4'):
        case VLC_FOURCC('R','V','3','2'):
            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
                    * ( ( p_vout->output.i_chroma
                           == VLC_FOURCC('R','G','B','2') ) ? 2 : 1 )
                    * 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_i420_rgb)
    switch( p_vout->output.i_chroma )
    {
    case VLC_FOURCC('R','G','B','2'):
        i_tables_size = sizeof( uint8_t ) * PALETTE_TABLE_SIZE;
        break;
    case VLC_FOURCC('R','V','1','5'):
    case VLC_FOURCC('R','V','1','6'):
        i_tables_size = sizeof( uint16_t ) * RGB_TABLE_SIZE;
        break;
    default: /* RV24, RV32 */
        i_tables_size = sizeof( uint32_t ) * 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;
}

/*****************************************************************************
 * Deactivate: free the chroma function
 *****************************************************************************
 * This function frees the previously allocated chroma function
 *****************************************************************************/