video_filter.c

uclinux 下的vlc播放器源代码

/*****************************************************************************
 * video filter: video filter doing chroma conversion and resizing
 *               using the ffmpeg library
 *****************************************************************************
 * Copyright (C) 1999-2001 the VideoLAN team
 * $Id: video_filter.c 14796 2006-03-18 11:27:10Z zorglub $
 *
 * Authors: Gildas Bazin <[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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
 *****************************************************************************/

/*****************************************************************************
 * Preamble
 *****************************************************************************/
#include <vlc/vlc.h>
#include <vlc/decoder.h>
#include "vlc_filter.h"

/* ffmpeg header */
#ifdef HAVE_FFMPEG_AVCODEC_H
#   include <ffmpeg/avcodec.h>
#else
#   include <avcodec.h>
#endif

#include "ffmpeg.h"

void E_(InitLibavcodec) ( vlc_object_t *p_object );
static int CheckInit( filter_t *p_filter );
static picture_t *Process( filter_t *p_filter, picture_t *p_pic );
static picture_t *Deinterlace( filter_t *p_filter, picture_t *p_pic );

/*****************************************************************************
 * filter_sys_t : filter descriptor
 *****************************************************************************/
struct filter_sys_t
{
    vlc_bool_t b_resize;
    vlc_bool_t b_convert;
    vlc_bool_t b_resize_first;
    vlc_bool_t b_enable_croppadd;

    es_format_t fmt_in;
    int i_src_ffmpeg_chroma;
    es_format_t fmt_out;
    int i_dst_ffmpeg_chroma;

    AVPicture tmp_pic;
    ImgReSampleContext *p_rsc;
};


/*****************************************************************************
 * OpenFilterEx: common code to OpenFilter and OpenCropPadd
 *****************************************************************************/
static int OpenFilterEx( vlc_object_t *p_this, vlc_bool_t b_enable_croppadd )
{
    filter_t *p_filter = (filter_t*)p_this;
    filter_sys_t *p_sys;
    vlc_bool_t b_convert, b_resize;

    /* Check if we can handle that formats */
    if( E_(GetFfmpegChroma)( p_filter->fmt_in.video.i_chroma ) < 0 ||
        E_(GetFfmpegChroma)( p_filter->fmt_out.video.i_chroma ) < 0 )
    {
        return VLC_EGENERIC;
    }

    b_resize =
        p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ||
        p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height;

    if ( b_enable_croppadd ) 
    {
        b_resize = b_resize ||
            p_filter->fmt_in.video.i_visible_width != p_filter->fmt_in.video.i_width ||
            p_filter->fmt_in.video.i_visible_height != p_filter->fmt_in.video.i_height ||
            p_filter->fmt_in.video.i_x_offset != 0 ||
            p_filter->fmt_in.video.i_y_offset != 0 ||
            p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ||
            p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ||
            p_filter->fmt_out.video.i_x_offset != 0 ||
            p_filter->fmt_out.video.i_y_offset != 0;
    }

    b_convert =
        p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma;

    if( !b_resize && !b_convert )
    {
        /* Nothing to do */
        return VLC_EGENERIC;
    }

    /* Allocate the memory needed to store the decoder's structure */
    if( ( p_filter->p_sys = p_sys =
          (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
    {
        msg_Err( p_filter, "out of memory" );
        return VLC_EGENERIC;
    }

    /* Misc init */
    p_sys->p_rsc = NULL;
    p_sys->b_enable_croppadd = b_enable_croppadd;
    p_sys->i_src_ffmpeg_chroma =
        E_(GetFfmpegChroma)( p_filter->fmt_in.video.i_chroma );
    p_sys->i_dst_ffmpeg_chroma =
        E_(GetFfmpegChroma)( p_filter->fmt_out.video.i_chroma );
    p_filter->pf_video_filter = Process;
    es_format_Init( &p_sys->fmt_in, 0, 0 );
    es_format_Init( &p_sys->fmt_out, 0, 0 );

    /* Dummy alloc, will be reallocated in CheckInit */
    avpicture_alloc( &p_sys->tmp_pic, p_sys->i_src_ffmpeg_chroma,
                     p_filter->fmt_out.video.i_width,
                     p_filter->fmt_out.video.i_height );

    if( CheckInit( p_filter ) != VLC_SUCCESS )
    {
        free( p_sys );
        return VLC_EGENERIC;
    }

    msg_Dbg( p_filter, "input: %ix%i %4.4s -> %ix%i %4.4s",
             p_filter->fmt_in.video.i_width, p_filter->fmt_in.video.i_height,
             (char *)&p_filter->fmt_in.video.i_chroma,
             p_filter->fmt_out.video.i_width, p_filter->fmt_out.video.i_height,
             (char *)&p_filter->fmt_out.video.i_chroma );

    /* libavcodec needs to be initialized for some chroma conversions */
    E_(InitLibavcodec)(p_this);

    return VLC_SUCCESS;
}

/*****************************************************************************
 * OpenFilter: probe the filter and return score
 *****************************************************************************/
int E_(OpenFilter)( vlc_object_t *p_this )
{
    return OpenFilterEx( p_this, VLC_FALSE );
}

/*****************************************************************************
 * OpenCropPadd: probe the filter and return score
 *****************************************************************************/
int E_(OpenCropPadd)( vlc_object_t *p_this )
{
    return OpenFilterEx( p_this, VLC_TRUE );
}


/*****************************************************************************
 * CloseFilter: clean up the filter
 *****************************************************************************/
void E_(CloseFilter)( vlc_object_t *p_this )
{
    filter_t *p_filter = (filter_t*)p_this;
    filter_sys_t *p_sys = p_filter->p_sys;

    if( p_sys->p_rsc ) img_resample_close( p_sys->p_rsc );

    avpicture_free( &p_sys->tmp_pic );

    free( p_sys );
}

/*****************************************************************************
 * CheckInit: Initialise filter when necessary
 *****************************************************************************/
static int CheckInit( filter_t *p_filter )
{
    filter_sys_t *p_sys = p_filter->p_sys;
    vlc_bool_t b_change;
    int i_croptop=0;
    int i_cropbottom=0;
    int i_cropleft=0;
    int i_cropright=0;
    int i_paddtop=0;
    int i_paddbottom=0;
    int i_paddleft=0;
    int i_paddright=0;


    b_change= p_filter->fmt_in.video.i_width != p_sys->fmt_in.video.i_width ||
        p_filter->fmt_in.video.i_height != p_sys->fmt_in.video.i_height ||
        p_filter->fmt_out.video.i_width != p_sys->fmt_out.video.i_width ||
        p_filter->fmt_out.video.i_height != p_sys->fmt_out.video.i_height;

    if ( p_sys->b_enable_croppadd )
    {
        b_change = b_change ||
            p_filter->fmt_in.video.i_y_offset != p_sys->fmt_in.video.i_y_offset ||
            p_filter->fmt_in.video.i_x_offset != p_sys->fmt_in.video.i_x_offset ||
            p_filter->fmt_in.video.i_visible_width != p_sys->fmt_in.video.i_visible_width ||
            p_filter->fmt_in.video.i_visible_height != p_sys->fmt_in.video.i_visible_height ||
            p_filter->fmt_out.video.i_y_offset != p_sys->fmt_out.video.i_y_offset ||
            p_filter->fmt_out.video.i_x_offset != p_sys->fmt_out.video.i_x_offset ||
            p_filter->fmt_out.video.i_visible_width != p_sys->fmt_out.video.i_visible_width ||
            p_filter->fmt_out.video.i_visible_height != p_sys->fmt_out.video.i_visible_height;
    }

    if ( b_change )
    {
        if( p_sys->p_rsc ) img_resample_close( p_sys->p_rsc );
        p_sys->p_rsc = 0;

        p_sys->b_convert =
          p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma;

        p_sys->b_resize =
          p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ||
          p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height;

        p_sys->b_resize_first =
          p_filter->fmt_in.video.i_width * p_filter->fmt_in.video.i_height >
          p_filter->fmt_out.video.i_width * p_filter->fmt_out.video.i_height;

        if( p_sys->b_resize &&
            p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUV420P &&
            p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUVJ420P &&
            p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUV420P &&
            p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUVJ420P )
        {
            msg_Err( p_filter, "img_resample_init only deals with I420" );
            return VLC_EGENERIC;
        }
        else if( p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUV420P &&
                 p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUVJ420P )
        {
            p_sys->b_resize_first = VLC_FALSE;
        }
        else if( p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUV420P &&
                 p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUVJ420P )
        {
            p_sys->b_resize_first = VLC_TRUE;
        }

        if ( p_sys->b_enable_croppadd )
        {
            p_sys->b_resize = p_sys->b_resize ||
                p_filter->fmt_in.video.i_visible_width != p_filter->fmt_in.video.i_width ||
                p_filter->fmt_in.video.i_visible_height != p_filter->fmt_in.video.i_height ||
                p_filter->fmt_in.video.i_x_offset != 0 ||
                p_filter->fmt_in.video.i_y_offset != 0 ||
                p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ||
                p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ||
                p_filter->fmt_out.video.i_x_offset != 0 ||
                p_filter->fmt_out.video.i_y_offset != 0;
        }

        if( p_sys->b_resize )
        {
            if ( p_sys->b_enable_croppadd )
            {
                i_croptop=p_filter->fmt_in.video.i_y_offset;
                i_cropbottom=p_filter->fmt_in.video.i_height
                                       - p_filter->fmt_in.video.i_visible_height
                                       - p_filter->fmt_in.video.i_y_offset;
                i_cropleft=p_filter->fmt_in.video.i_x_offset;
                i_cropright=p_filter->fmt_in.video.i_width
                                      - p_filter->fmt_in.video.i_visible_width
                                      - p_filter->fmt_in.video.i_x_offset;


                i_paddtop=p_filter->fmt_out.video.i_y_offset;
                i_paddbottom=p_filter->fmt_out.video.i_height
                                       - p_filter->fmt_out.video.i_visible_height
                                       - p_filter->fmt_out.video.i_y_offset;
                i_paddleft=p_filter->fmt_out.video.i_x_offset;
                i_paddright=p_filter->fmt_out.video.i_width
                                      - p_filter->fmt_out.video.i_visible_width
                                      - p_filter->fmt_out.video.i_x_offset;
            }

#if LIBAVCODEC_BUILD >= 4708
            p_sys->p_rsc = img_resample_full_init( 
                               p_filter->fmt_out.video.i_width,
                               p_filter->fmt_out.video.i_height,
                               p_filter->fmt_in.video.i_width,
                               p_filter->fmt_in.video.i_height,
                               i_croptop,i_cropbottom,
                               i_cropleft,i_cropright,
                               i_paddtop,i_paddbottom,
                               i_paddleft,i_paddright );
#else
            p_sys->p_rsc = img_resample_full_init( 
                               p_filter->fmt_out.video.i_width - i_paddleft - i_paddright,
                               p_filter->fmt_out.video.i_height - i_paddtop - i_paddbottom,
                               p_filter->fmt_in.video.i_width,
                               p_filter->fmt_in.video.i_height,
                               i_croptop,i_cropbottom,
                               i_cropleft,i_cropright );
#endif
            msg_Dbg( p_filter, "input: %ix%i -> %ix%i",
                p_filter->fmt_out.video.i_width,
                p_filter->fmt_out.video.i_height,
                p_filter->fmt_in.video.i_width,
                p_filter->fmt_in.video.i_height);

            if( !p_sys->p_rsc )
            {
                msg_Err( p_filter, "img_resample_init failed" );
                return VLC_EGENERIC;
            }
        }

        avpicture_free( &p_sys->tmp_pic );

        if( p_sys->b_resize_first )
        {
            /* Resizing then conversion */
            avpicture_alloc( &p_sys->tmp_pic, p_sys->i_src_ffmpeg_chroma,
                             p_filter->fmt_out.video.i_width,
                             p_filter->fmt_out.video.i_height );
        }
        else
        {
            /* Conversion then resizing */
            avpicture_alloc( &p_sys->tmp_pic, p_sys->i_dst_ffmpeg_chroma,
                             p_filter->fmt_in.video.i_width,
                             p_filter->fmt_in.video.i_height );
        }

        p_sys->fmt_in = p_filter->fmt_in;
        p_sys->fmt_out = p_filter->fmt_out;
    }

    return VLC_SUCCESS;
}

/* fill padd code from ffmpeg */
static int padcolor[3] = { 16, 128, 128 };