i420_yuy2.c

video linux conference

/*****************************************************************************
 * i420_yuy2.c : YUV to YUV conversion module for vlc
 *****************************************************************************
 * Copyright (C) 2000, 2001 VideoLAN
 * $Id: i420_yuy2.c 10101 2005-03-02 16:47:31Z robux4 $
 *
 * Authors: Samuel 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 <string.h>                                            /* strerror() */
#include <stdlib.h>                                      /* malloc(), free() */

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

#ifdef HAVE_ALTIVEC_H
#   include <altivec.h>
#endif

#include "i420_yuy2.h"

#define SRC_FOURCC  "I420,IYUV,YV12"

#if defined (MODULE_NAME_IS_i420_yuy2)
#    define DEST_FOURCC "YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv,Y211"
#elif defined (MODULE_NAME_IS_i420_yuy2_mmx)
#    define DEST_FOURCC "YUY2,YUNV,YVYU,UYVY,UYNV,Y422,IUYV,cyuv"
#elif defined (MODULE_NAME_IS_i420_yuy2_altivec)
#    define DEST_FOURCC "YUY2,YUNV"
#endif

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

static void I420_YUY2           ( vout_thread_t *, picture_t *, picture_t * );
#if !defined (MODULE_NAME_IS_i420_yuy2_altivec)
static void I420_YVYU           ( vout_thread_t *, picture_t *, picture_t * );
static void I420_UYVY           ( vout_thread_t *, picture_t *, picture_t * );
static void I420_IUYV           ( vout_thread_t *, picture_t *, picture_t * );
static void I420_cyuv           ( vout_thread_t *, picture_t *, picture_t * );
#endif
#if defined (MODULE_NAME_IS_i420_yuy2)
static void I420_Y211           ( vout_thread_t *, picture_t *, picture_t * );
#endif

#ifdef MODULE_NAME_IS_i420_yuy2_mmx
static uint64_t i_00ffw;
static uint64_t i_80w;
#endif

/*****************************************************************************
 * Module descriptor.
 *****************************************************************************/
vlc_module_begin();
#if defined (MODULE_NAME_IS_i420_yuy2)
    set_description( _("Conversions from " SRC_FOURCC " to " DEST_FOURCC) );
    set_capability( "chroma", 80 );
#elif defined (MODULE_NAME_IS_i420_yuy2_mmx)
    set_description( _("MMX conversions from " SRC_FOURCC " to " DEST_FOURCC) );
    set_capability( "chroma", 100 );
    add_requirement( MMX );
    /* Initialize MMX-specific constants */
    i_00ffw = 0x00ff00ff00ff00ffULL;
    i_80w   = 0x0000000080808080ULL;
#elif defined (MODULE_NAME_IS_i420_yuy2_altivec)
    set_description(
            _("AltiVec conversions from " SRC_FOURCC " to " DEST_FOURCC) );
    set_capability( "chroma", 100 );
    add_requirement( ALTIVEC );
#endif
    set_callbacks( Activate, NULL );
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( 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 )
            {
                case VLC_FOURCC('Y','U','Y','2'):
                case VLC_FOURCC('Y','U','N','V'):
                    p_vout->chroma.pf_convert = I420_YUY2;
                    break;

#if !defined (MODULE_NAME_IS_i420_yuy2_altivec)
                case VLC_FOURCC('Y','V','Y','U'):
                    p_vout->chroma.pf_convert = I420_YVYU;
                    break;

                case VLC_FOURCC('U','Y','V','Y'):
                case VLC_FOURCC('U','Y','N','V'):
                case VLC_FOURCC('Y','4','2','2'):
                    p_vout->chroma.pf_convert = I420_UYVY;
                    break;

                case VLC_FOURCC('I','U','Y','V'):
                    p_vout->chroma.pf_convert = I420_IUYV;
                    break;

                case VLC_FOURCC('c','y','u','v'):
                    p_vout->chroma.pf_convert = I420_cyuv;
                    break;
#endif

#if defined (MODULE_NAME_IS_i420_yuy2)
                case VLC_FOURCC('Y','2','1','1'):
                    p_vout->chroma.pf_convert = I420_Y211;
                    break;
#endif

                default:
                    return -1;
            }
            break;

        default:
            return -1;
    }

    return 0;
}

/* Following functions are local */

/*****************************************************************************
 * I420_YUY2: planar YUV 4:2:0 to packed YUYV 4:2:2
 *****************************************************************************/
static void I420_YUY2( vout_thread_t *p_vout, picture_t *p_source,
                                              picture_t *p_dest )
{
    uint8_t *p_line1, *p_line2 = p_dest->p->p_pixels;
    uint8_t *p_y1, *p_y2 = p_source->Y_PIXELS;
    uint8_t *p_u = p_source->U_PIXELS;
    uint8_t *p_v = p_source->V_PIXELS;

    int i_x, i_y;

#if defined (MODULE_NAME_IS_i420_yuy2_altivec)
#define VEC_NEXT_LINES( ) \
    p_line1  = p_line2; \
    p_line2 += p_dest->p->i_pitch; \
    p_y1     = p_y2; \
    p_y2    += p_source->p[Y_PLANE].i_pitch;

#define VEC_LOAD_UV( ) \
    u_vec = vec_ld( 0, p_u ); p_u += 16; \
    v_vec = vec_ld( 0, p_v ); p_v += 16;

#define VEC_MERGE( a ) \
    uv_vec = a( u_vec, v_vec ); \
    y_vec = vec_ld( 0, p_y1 ); p_y1 += 16; \
    vec_st( vec_mergeh( y_vec, uv_vec ), 0, p_line1 ); p_line1 += 16; \
    vec_st( vec_mergel( y_vec, uv_vec ), 0, p_line1 ); p_line1 += 16; \
    y_vec = vec_ld( 0, p_y2 ); p_y2 += 16; \
    vec_st( vec_mergeh( y_vec, uv_vec ), 0, p_line2 ); p_line2 += 16; \
    vec_st( vec_mergel( y_vec, uv_vec ), 0, p_line2 ); p_line2 += 16;

    vector unsigned char u_vec;
    vector unsigned char v_vec;
    vector unsigned char uv_vec;
    vector unsigned char y_vec;

    if( !( ( p_vout->render.i_width % 32 ) |
           ( p_vout->render.i_height % 2 ) ) )
    {
        /* Width is a multiple of 32, we take 2 lines at a time */
        for( i_y = p_vout->render.i_height / 2 ; i_y-- ; )
        {
            VEC_NEXT_LINES( );
            for( i_x = p_vout->render.i_width / 32 ; i_x-- ; )
            {
                VEC_LOAD_UV( );
                VEC_MERGE( vec_mergeh );
                VEC_MERGE( vec_mergel );
            }
        }
    }
    else if( !( ( p_vout->render.i_width % 16 ) |
                ( p_vout->render.i_height % 4 ) ) )
    {
        /* Width is only a multiple of 16, we take 4 lines at a time */
        for( i_y = p_vout->render.i_height / 4 ; i_y-- ; )
        {
            /* Line 1 and 2, pixels 0 to ( width - 16 ) */
            VEC_NEXT_LINES( );
            for( i_x = p_vout->render.i_width / 32 ; i_x-- ; )
            {
                VEC_LOAD_UV( );
                VEC_MERGE( vec_mergeh );
                VEC_MERGE( vec_mergel );
            }

            /* Line 1 and 2, pixels ( width - 16 ) to ( width ) */
            VEC_LOAD_UV( );
            VEC_MERGE( vec_mergeh );

            /* Line 3 and 4, pixels 0 to 16 */
            VEC_NEXT_LINES( );
            VEC_MERGE( vec_mergel );

            /* Line 3 and 4, pixels 16 to ( width ) */
            for( i_x = p_vout->render.i_width / 32 ; i_x-- ; )
            {
                VEC_LOAD_UV( );
                VEC_MERGE( vec_mergeh );
                VEC_MERGE( vec_mergel );
            }
        }
    }
    else
    {
        /* Crap, use the C version */
#undef VEC_NEXT_LINES
#undef VEC_LOAD_UV
#undef VEC_MERGE
#endif

    const int i_source_margin = p_source->p[0].i_pitch