deinterlace.c

/*****************************************************************************
 * deinterlace.c : deinterlacer plugin for vlc
 *****************************************************************************
 * Copyright (C) 2000-2009 the VideoLAN team
 * $Id$
 *
 * Author: Sam 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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/

#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#include <errno.h>

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

#include <vlc_common.h>
#include <vlc_plugin.h>
#include <vlc_vout.h>
#include <vlc_sout.h>
#include <vlc_filter.h>

#ifdef CAN_COMPILE_MMXEXT
#   include "mmx.h"
#endif

#include "filter_common.h"

#define DEINTERLACE_DISCARD 1
#define DEINTERLACE_MEAN    2
#define DEINTERLACE_BLEND   3
#define DEINTERLACE_BOB     4
#define DEINTERLACE_LINEAR  5
#define DEINTERLACE_X       6

/*****************************************************************************
 * Local protypes
 *****************************************************************************/
static int  Create    ( vlc_object_t * );
static void Destroy   ( vlc_object_t * );

static int  Init      ( vout_thread_t * );
static void End       ( vout_thread_t * );
static void Render    ( vout_thread_t *, picture_t * );

static int  MouseEvent( vlc_object_t *p_this, char const *psz_var,
                        vlc_value_t oldval, vlc_value_t newval, void *p_data );

static void RenderDiscard( vout_thread_t *, picture_t *, picture_t *, int );
static void RenderBob    ( vout_thread_t *, picture_t *, picture_t *, int );
static void RenderMean   ( vout_thread_t *, picture_t *, picture_t * );
static void RenderBlend  ( vout_thread_t *, picture_t *, picture_t * );
static void RenderLinear ( vout_thread_t *, picture_t *, picture_t *, int );
static void RenderX      ( picture_t *, picture_t * );

static void MergeGeneric ( void *, const void *, const void *, size_t );
#if defined(CAN_COMPILE_C_ALTIVEC)
static void MergeAltivec ( void *, const void *, const void *, size_t );
#endif
#if defined(CAN_COMPILE_MMXEXT)
static void MergeMMXEXT  ( void *, const void *, const void *, size_t );
#endif
#if defined(CAN_COMPILE_3DNOW)
static void Merge3DNow   ( void *, const void *, const void *, size_t );
#endif
#if defined(CAN_COMPILE_SSE)
static void MergeSSE2    ( void *, const void *, const void *, size_t );
#endif
#if defined(CAN_COMPILE_MMXEXT) || defined(CAN_COMPILE_SSE)
static void EndMMX       ( void );
#endif
#if defined(CAN_COMPILE_3DNOW)
static void End3DNow     ( void );
#endif
#if defined __ARM_NEON__
static void MergeNEON (void *, const void *, const void *, size_t);
#endif

static void SetFilterMethod( vout_thread_t *p_vout, const char *psz_method );
static vout_thread_t *SpawnRealVout( vout_thread_t *p_vout );

static int OpenFilter( vlc_object_t *p_this );
static void CloseFilter( vlc_object_t *p_this );

/*****************************************************************************
 * Callback prototypes
 *****************************************************************************/
static int FilterCallback( vlc_object_t *, char const *,
                           vlc_value_t, vlc_value_t, void * );

/*****************************************************************************
 * Module descriptor
 *****************************************************************************/
#define MODE_TEXT N_("Deinterlace mode")
#define MODE_LONGTEXT N_("Deinterlace method to use for local playback.")

#define SOUT_MODE_TEXT N_("Streaming deinterlace mode")
#define SOUT_MODE_LONGTEXT N_("Deinterlace method to use for streaming.")

#define FILTER_CFG_PREFIX "sout-deinterlace-"

static const char *const mode_list[] = {
    "discard", "blend", "mean", "bob", "linear", "x" };
static const char *const mode_list_text[] = {
    N_("Discard"), N_("Blend"), N_("Mean"), N_("Bob"), N_("Linear"), "X" };

vlc_module_begin ()
    set_description( N_("Deinterlacing video filter") )
    set_shortname( N_("Deinterlace" ))
    set_capability( "video filter", 0 )
    set_category( CAT_VIDEO )
    set_subcategory( SUBCAT_VIDEO_VFILTER )

    set_section( N_("Display"),NULL)
    add_string( "deinterlace-mode", "discard", NULL, MODE_TEXT,
                MODE_LONGTEXT, false )
        change_string_list( mode_list, mode_list_text, 0 )
        change_safe ()

    add_shortcut( "deinterlace" )
    set_callbacks( Create, Destroy )

    add_submodule ()
    set_capability( "video filter2", 0 )
    set_section( N_("Streaming"),NULL)
    add_string( FILTER_CFG_PREFIX "mode", "blend", NULL, SOUT_MODE_TEXT,
                SOUT_MODE_LONGTEXT, false )
        change_string_list( mode_list, mode_list_text, 0 )
    add_shortcut( "deinterlace" )
    set_callbacks( OpenFilter, CloseFilter )
vlc_module_end ()

static const char *const ppsz_filter_options[] = {
    "mode", NULL
};

/*****************************************************************************
 * vout_sys_t: Deinterlace video output method descriptor
 *****************************************************************************
 * This structure is part of the video output thread descriptor.
 * It describes the Deinterlace specific properties of an output thread.
 *****************************************************************************/
struct vout_sys_t
{
    int        i_mode;        /* Deinterlace mode */
    bool b_double_rate; /* Shall we double the framerate? */
    bool b_half_height; /* Shall be devide the height by 2 */

    mtime_t    last_date;
    mtime_t    next_date;

    vout_thread_t *p_vout;

    vlc_mutex_t filter_lock;

    void (*pf_merge) ( void *, const void *, const void *, size_t );
    void (*pf_end_merge) ( void );
};

/*****************************************************************************
 * Control: control facility for the vout (forwards to child vout)
 *****************************************************************************/
static int Control( vout_thread_t *p_vout, int i_query, va_list args )
{
    return vout_vaControl( p_vout->p_sys->p_vout, i_query, args );
}

/*****************************************************************************
 * Create: allocates Deinterlace video thread output method
 *****************************************************************************
 * This function allocates and initializes a Deinterlace vout method.
 *****************************************************************************/
static int Create( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    vout_sys_t *p_sys;
    char *psz_mode;

    /* Allocate structure */
    p_sys = p_vout->p_sys = malloc( sizeof( vout_sys_t ) );
    if( p_vout->p_sys == NULL )
        return VLC_ENOMEM;

    p_vout->pf_init = Init;
    p_vout->pf_end = End;
    p_vout->pf_manage = NULL;
    p_vout->pf_render = Render;
    p_vout->pf_display = NULL;
    p_vout->pf_control = Control;

    p_sys->i_mode = DEINTERLACE_DISCARD;
    p_sys->b_double_rate = false;
    p_sys->b_half_height = true;
    p_sys->last_date = 0;
    p_sys->p_vout = 0;
    vlc_mutex_init( &p_sys->filter_lock );

#if defined(CAN_COMPILE_C_ALTIVEC)
    if( vlc_CPU() & CPU_CAPABILITY_ALTIVEC )
    {
        p_sys->pf_merge = MergeAltivec;
        p_sys->pf_end_merge = NULL;
    }
    else
#endif
#if defined(CAN_COMPILE_SSE)
    if( vlc_CPU() & CPU_CAPABILITY_SSE2 )
    {
        p_sys->pf_merge = MergeSSE2;
        p_sys->pf_end_merge = EndMMX;
    }
    else
#endif
#if defined(CAN_COMPILE_MMXEXT)
    if( vlc_CPU() & CPU_CAPABILITY_MMXEXT )
    {
        p_sys->pf_merge = MergeMMXEXT;
        p_sys->pf_end_merge = EndMMX;
    }
    else
#endif
#if defined(CAN_COMPILE_3DNOW)
    if( vlc_CPU() & CPU_CAPABILITY_3DNOW )
    {
        p_sys->pf_merge = Merge3DNow;
        p_sys->pf_end_merge = End3DNow;
    }
    else
#endif
#if defined __ARM_NEON__
    if( vlc_CPU() & CPU_CAPABILITY_NEON )
    {
        p_sys->pf_merge = MergeNEON;
        p_sys->pf_end_merge = NULL;
    }
    else
#endif
    {
        p_sys->pf_merge = MergeGeneric;
        p_sys->pf_end_merge = NULL;
    }

    /* Look what method was requested */
    psz_mode = var_CreateGetString( p_vout, "deinterlace-mode" );

    if( !psz_mode )
    {
        msg_Err( p_vout, "configuration variable deinterlace-mode empty" );
        msg_Err( p_vout, "no deinterlace mode provided, using \"discard\"" );

        psz_mode = strdup( "discard" );
    }

    SetFilterMethod( p_vout, psz_mode );

    free( psz_mode );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * SetFilterMethod: setup the deinterlace method to use.
 *****************************************************************************/
static void SetFilterMethod( vout_thread_t *p_vout, const char *psz_method )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    if( !strcmp( psz_method, "mean" ) )
    {
        p_sys->i_mode = DEINTERLACE_MEAN;
        p_sys->b_double_rate = false;
        p_sys->b_half_height = true;
    }
    else if( !strcmp( psz_method, "blend" )
             || !strcmp( psz_method, "average" )
             || !strcmp( psz_method, "combine-fields" ) )
    {
        p_sys->i_mode = DEINTERLACE_BLEND;
        p_sys->b_double_rate = false;
        p_sys->b_half_height = false;
    }
    else if( !strcmp( psz_method, "bob" )
             || !strcmp( psz_method, "progressive-scan" ) )
    {
        p_sys->i_mode = DEINTERLACE_BOB;
        p_sys->b_double_rate = true;
        p_sys->b_half_height = false;
    }
    else if( !strcmp( psz_method, "linear" ) )
    {
        p_sys->i_mode = DEINTERLACE_LINEAR;
        p_sys->b_double_rate = true;
        p_sys->b_half_height = false;
    }
    else if( !strcmp( psz_method, "x" ) )
    {
        p_sys->i_mode = DEINTERLACE_X;
        p_sys->b_double_rate = false;
        p_sys->b_half_height = false;
    }
    else
    {
        const bool b_i422 = p_vout->render.i_chroma == VLC_CODEC_I422;
        if( strcmp( psz_method, "discard" ) )
            msg_Err( p_vout, "no valid deinterlace mode provided, "
                     "using \"discard\"" );

        p_sys->i_mode = DEINTERLACE_DISCARD;
        p_sys->b_double_rate = false;
        p_sys->b_half_height = !b_i422;
    }

    msg_Dbg( p_vout, "using %s deinterlace method", psz_method );
}

static void GetOutputFormat( vout_thread_t *p_vout,
                             video_format_t *p_dst, const video_format_t *p_src )
{
    *p_dst = *p_src;

    if( p_vout->p_sys->b_half_height )
    {
        p_dst->i_height /= 2;
        p_dst->i_visible_height /= 2;
        p_dst->i_y_offset /= 2;
        p_dst->i_sar_den *= 2;
    }

    if( p_src->i_chroma == VLC_CODEC_I422 )
    {
        switch( p_vout->p_sys->i_mode )
        {
        case DEINTERLACE_MEAN:
        case DEINTERLACE_LINEAR:
        case DEINTERLACE_X:
            p_dst->i_chroma = VLC_CODEC_I422;
            break;
        default:
            p_dst->i_chroma = VLC_CODEC_I420;
            break;
        }
    }
}

static bool IsChromaSupported( vlc_fourcc_t i_chroma )
{
    return i_chroma == VLC_CODEC_I420 ||
           i_chroma == VLC_CODEC_YV12 ||
           i_chroma == VLC_CODEC_I422;
}

/*****************************************************************************
 * Init: initialize Deinterlace video thread output method
 *****************************************************************************/
static int Init( vout_thread_t *p_vout )
{
    I_OUTPUTPICTURES = 0;

    if( !IsChromaSupported( p_vout->render.i_chroma ) )
        return VLC_EGENERIC; /* unknown chroma */

    /* Initialize the output structure, full of directbuffers since we want
     * the decoder to output directly to our structures. */
    p_vout->output.i_chroma = p_vout->render.i_chroma;
    p_vout->output.i_width  = p_vout->render.i_width;
    p_vout->output.i_height = p_vout->render.i_height;
    p_vout->output.i_aspect = p_vout->render.i_aspect;
    p_vout->fmt_out = p_vout->fmt_in;

    /* Try to open the real video output */
    p_vout->p_sys->p_vout = SpawnRealVout( p_vout );

    if( p_vout->p_sys->p_vout == NULL )
    {
        /* Everything failed */
        msg_Err( p_vout, "cannot open vout, aborting" );

        return VLC_EGENERIC;
    }

    vout_filter_AllocateDirectBuffers( p_vout, VOUT_MAX_PICTURES );

    vout_filter_AddChild( p_vout, p_vout->p_sys->p_vout, MouseEvent );

    var_AddCallback( p_vout, "deinterlace-mode", FilterCallback, NULL );

    return VLC_SUCCESS;
}

/*****************************************************************************
 * SpawnRealVout: spawn the real video output.
 *****************************************************************************/
static vout_thread_t *SpawnRealVout( vout_thread_t *p_vout )
{
    msg_Dbg( p_vout, "spawning the real video output" );

    video_format_t fmt;
    GetOutputFormat( p_vout, &fmt, &p_vout->fmt_out );

    return vout_Create( p_vout, &fmt );
}

/*****************************************************************************
 * End: terminate Deinterlace video thread output method
 *****************************************************************************/
static void End( vout_thread_t *p_vout )
{
    vout_sys_t *p_sys = p_vout->p_sys;

    var_DelCallback( p_vout, "deinterlace-mode", FilterCallback, NULL );

    if( p_sys->p_vout )
    {
        vout_filter_DelChild( p_vout, p_sys->p_vout, MouseEvent );
        vout_CloseAndRelease( p_sys->p_vout );
    }

    vout_filter_ReleaseDirectBuffers( p_vout );
}

/*****************************************************************************
 * Destroy: destroy Deinterlace video thread output method
 *****************************************************************************
 * Terminate an output method created by DeinterlaceCreateOutputMethod
 *****************************************************************************/
static void Destroy( vlc_object_t *p_this )
{
    vout_thread_t *p_vout = (vout_thread_t *)p_this;
    vlc_mutex_destroy( &p_vout->p_sys->filter_lock );
    free( p_vout->p_sys );
}

/**
 * Forward mouse event with proper conversion.
 */
static int MouseEvent( vlc_object_t *p_this, char const *psz_var,
                       vlc_value_t oldval, vlc_value_t newval, void *p_data )
{
    vout_thread_t *p_vout = p_data;
    VLC_UNUSED(p_this); VLC_UNUSED(oldval);

    if( !strcmp( psz_var, "mouse-y" ) && p_vout->p_sys->b_half_height )
        newval.i_int *= 2;

    return var_Set( p_vout, psz_var, newval );
}

/*****************************************************************************
 * Render: displays previously rendered output
 *****************************************************************************
 * This function send the currently rendered image to Deinterlace image,
 * waits until it is displayed and switch the two rendering buffers, preparing
 * next frame.
 *****************************************************************************/
static void Render ( vout_thread_t *p_vout, picture_t *p_pic )
{
    vout_sys_t *p_sys = p_vout->p_sys;
    picture_t *pp_outpic[2];

    /* FIXME are they needed ? */
    p_vout->fmt_out.i_x_offset = p_vout->fmt_in.i_x_offset;
    p_vout->fmt_out.i_y_offset = p_vout->fmt_in.i_y_offset;
    p_vout->fmt_out.i_visible_width = p_vout->fmt_in.i_visible_width;
    p_vout->fmt_out.i_visible_height = p_vout->fmt_in.i_visible_height;

    /* FIXME p_sys->p_vout->* should NOT be changed FIXME */
    p_sys->p_vout->fmt_in.i_x_offset = p_vout->fmt_out.i_x_offset;
    p_sys->p_vout->fmt_in.i_y_offset = p_vout->fmt_out.i_y_offset;
    p_sys->p_vout->fmt_in.i_visible_width = p_vout->fmt_out.i_visible_width;
    p_sys->p_vout->fmt_in.i_visible_height = p_vout->fmt_in.i_visible_height;
    if( p_vout->p_sys->b_half_height )
    {
        p_sys->p_vout->fmt_in.i_y_offset /= 2;
        p_sys->p_vout->fmt_in.i_visible_height /= 2;
    }

    if( p_vout->i_changes & VOUT_ASPECT_CHANGE )
    {
        p_vout->i_changes &= ~VOUT_ASPECT_CHANGE;

        p_vout->fmt_out.i_aspect = p_vout->fmt_in.i_aspect;
        p_vout->fmt_out.i_sar_num = p_vout->fmt_in.i_sar_num;
        p_vout->fmt_out.i_sar_den = p_vout->fmt_in.i_sar_den;

        video_format_t fmt = p_vout->fmt_out;
        if( p_vout->p_sys->b_half_height )
        {
            fmt.i_height /= 2; fmt.i_visible_height /= 2; fmt.i_y_offset /= 2;
            fmt.i_sar_den *= 2;
        }

        p_sys->p_vout = vout_Request( p_vout, p_sys->p_vout, &fmt );
    }
    if( !p_sys->p_vout )
        return;

    pp_outpic[0] = pp_outpic[1] = NULL;

    vlc_mutex_lock( &p_vout->p_sys->filter_lock );

    /* Get a new picture */
    while( ( pp_outpic[0] = vout_CreatePicture( p_vout->p_sys->p_vout,
                                                0, 0, 0 ) )
              == NULL )
    {
        if( !vlc_object_alive( p_vout ) || p_vout->b_error )
        {
            vlc_mutex_unlock( &p_vout->p_sys->filter_lock );
            return;
        }
        msleep( VOUT_OUTMEM_SLEEP );
    }

    pp_outpic[0]->date = p_pic->date;

    /* If we are using double rate, get an additional new picture */
    if( p_vout->p_sys->b_double_rate )
    {
        while( ( pp_outpic[1] = vout_CreatePicture( p_vout->p_sys->p_vout,
                                                 0, 0, 0 ) )
                  == NULL )
        {
            if( !vlc_object_alive( p_vout ) || p_vout->b_error )
            {
                vout_DestroyPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
                vlc_mutex_unlock( &p_vout->p_sys->filter_lock );
                return;
            }
            msleep( VOUT_OUTMEM_SLEEP );
        }

        /* 20ms is a bit arbitrary, but it's only for the first image we get */
        if( !p_vout->p_sys->last_date )
            pp_outpic[1]->date = p_pic->date + 20000;
        else
            pp_outpic[1]->date = (3 * p_pic->date - p_vout->p_sys->last_date) / 2;
        p_vout->p_sys->last_date = p_pic->date;
    }

    switch( p_vout->p_sys->i_mode )
    {
        case DEINTERLACE_DISCARD:
            RenderDiscard( p_vout, pp_outpic[0], p_pic, 0 );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            break;

        case DEINTERLACE_BOB:
            RenderBob( p_vout, pp_outpic[0], p_pic, p_pic->b_top_field_first ? 0 : 1 );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            RenderBob( p_vout, pp_outpic[1], p_pic, p_pic->b_top_field_first ? 1 : 0 );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[1] );
            break;

        case DEINTERLACE_LINEAR:
            RenderLinear( p_vout, pp_outpic[0], p_pic, p_pic->b_top_field_first ? 0 : 1 );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            RenderLinear( p_vout, pp_outpic[1], p_pic, p_pic->b_top_field_first ? 1 : 0 );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[1] );
            break;

        case DEINTERLACE_MEAN:
            RenderMean( p_vout, pp_outpic[0], p_pic );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            break;

        case DEINTERLACE_BLEND:
            RenderBlend( p_vout, pp_outpic[0], p_pic );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            break;

        case DEINTERLACE_X:
            RenderX( pp_outpic[0], p_pic );
            vout_DisplayPicture( p_vout->p_sys->p_vout, pp_outpic[0] );
            break;
    }
    vlc_mutex_unlock( &p_vout->p_sys->filter_lock );
}

/*****************************************************************************
 * RenderDiscard: only keep TOP or BOTTOM field, discard the other.
 *****************************************************************************/
static void RenderDiscard( vout_thread_t *p_vout,
                           picture_t *p_outpic, picture_t *p_pic, int i_field )
{
    int i_plane;

    /* Copy image and skip lines */
    for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
    {
        uint8_t *p_in, *p_out_end, *p_out;
        int i_increment;

        p_in = p_pic->p[i_plane].p_pixels
                   + i_field * p_pic->p[i_plane].i_pitch;

        p_out = p_outpic->p[i_plane].p_pixels;
        p_out_end = p_out + p_outpic->p[i_plane].i_pitch
                             * p_outpic->p[i_plane].i_visible_lines;

        switch( p_vout->render.i_chroma )
        {
        case VLC_CODEC_I420:
        case VLC_CODEC_YV12:

            for( ; p_out < p_out_end ; )
            {
                vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                p_out += p_outpic->p[i_plane].i_pitch;
                p_in += 2 * p_pic->p[i_plane].i_pitch;
            }
            break;

        case VLC_CODEC_I422:

            i_increment = 2 * p_pic->p[i_plane].i_pitch;

            if( i_plane == Y_PLANE )
            {
                for( ; p_out < p_out_end ; )
                {
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                    p_out += p_outpic->p[i_plane].i_pitch;
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                    p_out += p_outpic->p[i_plane].i_pitch;
                    p_in += i_increment;
                }
            }
            else
            {
                for( ; p_out < p_out_end ; )
                {
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                    p_out += p_outpic->p[i_plane].i_pitch;
                    p_in += i_increment;
                }
            }
            break;

        default:
            break;
        }
    }
}

/*****************************************************************************
 * RenderBob: renders a BOB picture - simple copy
 *****************************************************************************/
static void RenderBob( vout_thread_t *p_vout,
                       picture_t *p_outpic, picture_t *p_pic, int i_field )
{
    int i_plane;

    /* Copy image and skip lines */
    for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
    {
        uint8_t *p_in, *p_out_end, *p_out;

        p_in = p_pic->p[i_plane].p_pixels;
        p_out = p_outpic->p[i_plane].p_pixels;
        p_out_end = p_out + p_outpic->p[i_plane].i_pitch
                             * p_outpic->p[i_plane].i_visible_lines;

        switch( p_vout->render.i_chroma )
        {
            case VLC_CODEC_I420:
            case VLC_CODEC_YV12:
                /* For BOTTOM field we need to add the first line */
                if( i_field == 1 )
                {
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                    p_in += p_pic->p[i_plane].i_pitch;
                    p_out += p_outpic->p[i_plane].i_pitch;
                }

                p_out_end -= 2 * p_outpic->p[i_plane].i_pitch;

                for( ; p_out < p_out_end ; )
                {
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                    p_out += p_outpic->p[i_plane].i_pitch;

                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                    p_in += 2 * p_pic->p[i_plane].i_pitch;
                    p_out += p_outpic->p[i_plane].i_pitch;
                }

                vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                /* For TOP field we need to add the last line */
                if( i_field == 0 )
                {
                    p_in += p_pic->p[i_plane].i_pitch;
                    p_out += p_outpic->p[i_plane].i_pitch;
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                }
                break;

            case VLC_CODEC_I422:
                /* For BOTTOM field we need to add the first line */
                if( i_field == 1 )
                {
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                    p_in += p_pic->p[i_plane].i_pitch;
                    p_out += p_outpic->p[i_plane].i_pitch;
                }

                p_out_end -= 2 * p_outpic->p[i_plane].i_pitch;

                if( i_plane == Y_PLANE )
                {
                    for( ; p_out < p_out_end ; )
                    {
                        vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                        p_out += p_outpic->p[i_plane].i_pitch;

                        vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                        p_in += 2 * p_pic->p[i_plane].i_pitch;
                        p_out += p_outpic->p[i_plane].i_pitch;
                    }
                }
                else
                {
                    for( ; p_out < p_out_end ; )
                    {
                        vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                        p_out += p_outpic->p[i_plane].i_pitch;
                        p_in += 2 * p_pic->p[i_plane].i_pitch;
                    }
                }

                vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

                /* For TOP field we need to add the last line */
                if( i_field == 0 )
                {
                    p_in += p_pic->p[i_plane].i_pitch;
                    p_out += p_outpic->p[i_plane].i_pitch;
                    vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                }
                break;
        }
    }
}

#define Merge p_vout->p_sys->pf_merge
#define EndMerge if(p_vout->p_sys->pf_end_merge) p_vout->p_sys->pf_end_merge

/*****************************************************************************
 * RenderLinear: BOB with linear interpolation
 *****************************************************************************/
static void RenderLinear( vout_thread_t *p_vout,
                          picture_t *p_outpic, picture_t *p_pic, int i_field )
{
    int i_plane;

    /* Copy image and skip lines */
    for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
    {
        uint8_t *p_in, *p_out_end, *p_out;

        p_in = p_pic->p[i_plane].p_pixels;
        p_out = p_outpic->p[i_plane].p_pixels;
        p_out_end = p_out + p_outpic->p[i_plane].i_pitch
                             * p_outpic->p[i_plane].i_visible_lines;

        /* For BOTTOM field we need to add the first line */
        if( i_field == 1 )
        {
            vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
            p_in += p_pic->p[i_plane].i_pitch;
            p_out += p_outpic->p[i_plane].i_pitch;
        }

        p_out_end -= 2 * p_outpic->p[i_plane].i_pitch;

        for( ; p_out < p_out_end ; )
        {
            vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

            p_out += p_outpic->p[i_plane].i_pitch;

            Merge( p_out, p_in, p_in + 2 * p_pic->p[i_plane].i_pitch,
                   p_pic->p[i_plane].i_pitch );

            p_in += 2 * p_pic->p[i_plane].i_pitch;
            p_out += p_outpic->p[i_plane].i_pitch;
        }

        vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );

        /* For TOP field we need to add the last line */
        if( i_field == 0 )
        {
            p_in += p_pic->p[i_plane].i_pitch;
            p_out += p_outpic->p[i_plane].i_pitch;
            vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
        }
    }
    EndMerge();
}

static void RenderMean( vout_thread_t *p_vout,
                        picture_t *p_outpic, picture_t *p_pic )
{
    int i_plane;

    /* Copy image and skip lines */
    for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
    {
        uint8_t *p_in, *p_out_end, *p_out;

        p_in = p_pic->p[i_plane].p_pixels;

        p_out = p_outpic->p[i_plane].p_pixels;
        p_out_end = p_out + p_outpic->p[i_plane].i_pitch
                             * p_outpic->p[i_plane].i_visible_lines;

        /* All lines: mean value */
        for( ; p_out < p_out_end ; )
        {
            Merge( p_out, p_in, p_in + p_pic->p[i_plane].i_pitch,
                   p_pic->p[i_plane].i_pitch );

            p_out += p_outpic->p[i_plane].i_pitch;
            p_in += 2 * p_pic->p[i_plane].i_pitch;
        }
    }
    EndMerge();
}

static void RenderBlend( vout_thread_t *p_vout,
                         picture_t *p_outpic, picture_t *p_pic )
{
    int i_plane;

    /* Copy image and skip lines */
    for( i_plane = 0 ; i_plane < p_pic->i_planes ; i_plane++ )
    {
        uint8_t *p_in, *p_out_end, *p_out;

        p_in = p_pic->p[i_plane].p_pixels;

        p_out = p_outpic->p[i_plane].p_pixels;
        p_out_end = p_out + p_outpic->p[i_plane].i_pitch
                             * p_outpic->p[i_plane].i_visible_lines;

        switch( p_vout->render.i_chroma )
        {
            case VLC_CODEC_I420:
            case VLC_CODEC_YV12:
                /* First line: simple copy */
                vlc_memcpy( p_out, p_in, p_pic->p[i_plane].i_pitch );
                p_out += p_outpic->p[i_plane].i_pitch;

                /* Remaining lines: mean value */
                for( ; p_out < p_out_end ; )
                {
                    Merge( p_out, p_in, p_in + p_pic->p[i_plane].i_pitch,
                           p_pic->p[i_plane].i_pitch );

                    p_out += p_outpic->p[i_plane].i_pitch;