git.sesse.net Git - vlc/blob - modules/video_filter/imgresample.c

   1 /*****************************************************************************
   2  * imageresample.c: scaling and chroma conversion using the old libavcodec API
   3  *****************************************************************************
   4  * Copyright (C) 1999-2001 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Laurent Aimar <fenrir@via.ecp.fr>
   8  *          Gildas Bazin <gbazin@videolan.org>
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License as published by
  12  * the Free Software Foundation; either version 2 of the License, or
  13  * (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  * GNU General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public License
  21  * along with this program; if not, write to the Free Software
  22  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #ifdef HAVE_CONFIG_H
  29 # include "config.h"
  30 #endif
  31
  32 #include <vlc_common.h>
  33 #include <vlc_plugin.h>
  34 #include <vlc_vout.h>
  35 #include <vlc_filter.h>
  36
  37 /* ffmpeg header */
  38 #ifdef HAVE_LIBAVCODEC_AVCODEC_H
  39 #   include <libavcodec/avcodec.h>
  40 #elif defined(HAVE_FFMPEG_AVCODEC_H)
  41 #   include <ffmpeg/avcodec.h>
  42 #else
  43 #   include <avcodec.h>
  44 #endif
  45
  46 #include "../codec/avcodec/chroma.h"
  47
  48 /*****************************************************************************
  49  * Local prototypes
  50  *****************************************************************************/
  51 static int  OpenFilter( vlc_object_t * );
  52 static void CloseFilter( vlc_object_t * );
  53
  54 static void Conversion( filter_t *, picture_t *, picture_t * );
  55 static picture_t *Conversion_Filter( filter_t *, picture_t * );
  56
  57 /*****************************************************************************
  58  * Module descriptor
  59  *****************************************************************************/
  60 vlc_module_begin();
  61     set_capability( "video filter2", 50 );
  62     set_callbacks( OpenFilter, CloseFilter );
  63     set_description( N_("FFmpeg video filter") );
  64 vlc_module_end();
  65
  66 /*****************************************************************************
  67  * chroma_sys_t: chroma method descriptor
  68  *****************************************************************************
  69  * This structure is part of the chroma transformation descriptor, it
  70  * describes the chroma plugin specific properties.
  71  *****************************************************************************/
  72 struct filter_sys_t
  73 {
  74     int i_src_vlc_chroma;
  75     int i_src_ffmpeg_chroma;
  76     int i_dst_vlc_chroma;
  77     int i_dst_ffmpeg_chroma;
  78     AVPicture tmp_pic;
  79     ImgReSampleContext *p_rsc;
  80 };
  81
  82 /*****************************************************************************
  83  * OpenFilter: allocate a chroma function
  84  *****************************************************************************
  85  * This function allocates and initializes a chroma function
  86  *****************************************************************************/
  87 int OpenFilter( vlc_object_t *p_this )
  88 {
  89     filter_t *p_filter = (filter_t *)p_this;
  90     int i_ffmpeg_chroma[2], i_vlc_chroma[2], i;
  91
  92     /*
  93      * Check the source chroma first, then the destination chroma
  94      */
  95     i_vlc_chroma[0] = p_filter->fmt_in.video.i_chroma;
  96     i_vlc_chroma[1] = p_filter->fmt_out.video.i_chroma;
  97     for( i = 0; i < 2; i++ )
  98     {
  99         i_ffmpeg_chroma[i] = GetFfmpegChroma( i_vlc_chroma[i] );
 100         if( i_ffmpeg_chroma[i] < 0 ) return VLC_EGENERIC;
 101     }
 102
 103     p_filter->pf_video_filter = Conversion_Filter;
 104
 105     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 106     if( p_filter->p_sys == NULL )
 107     {
 108         return VLC_ENOMEM;
 109     }
 110
 111     p_filter->p_sys->i_src_vlc_chroma = p_filter->fmt_in.video.i_chroma;
 112     p_filter->p_sys->i_dst_vlc_chroma = p_filter->fmt_out.video.i_chroma;
 113     p_filter->p_sys->i_src_ffmpeg_chroma = i_ffmpeg_chroma[0];
 114     p_filter->p_sys->i_dst_ffmpeg_chroma = i_ffmpeg_chroma[1];
 115
 116     if( ( p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height ||
 117           p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ) &&
 118         ( p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('I','4','2','0') ||
 119           p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','1','2') ))
 120     {
 121         msg_Dbg( p_filter, "preparing to resample picture" );
 122         p_filter->p_sys->p_rsc =
 123             img_resample_init( p_filter->fmt_out.video.i_width,
 124                                p_filter->fmt_out.video.i_height,
 125                                p_filter->fmt_in.video.i_width,
 126                                p_filter->fmt_in.video.i_height );
 127         avpicture_alloc( &p_filter->p_sys->tmp_pic,
 128                          p_filter->p_sys->i_dst_ffmpeg_chroma,
 129                          p_filter->fmt_in.video.i_width,
 130                          p_filter->fmt_in.video.i_height );
 131     }
 132     else
 133     {
 134         msg_Dbg( p_filter, "no resampling" );
 135         p_filter->p_sys->p_rsc = NULL;
 136     }
 137
 138     return VLC_SUCCESS;
 139 }
 140
 141 VIDEO_FILTER_WRAPPER( Conversion )
 142
 143 /*****************************************************************************
 144  * ChromaConversion: actual chroma conversion function
 145  *****************************************************************************/
 146 static void Conversion( filter_t *p_filter,
 147                         picture_t *p_src, picture_t *p_dest )
 148 {
 149     AVPicture src_pic;
 150     AVPicture dest_pic;
 151     int i;
 152
 153     /* Prepare the AVPictures for converion */
 154     for( i = 0; i < p_src->i_planes; i++ )
 155     {
 156         src_pic.data[i] = p_src->p[i].p_pixels;
 157         src_pic.linesize[i] = p_src->p[i].i_pitch;
 158     }
 159     for( i = 0; i < p_dest->i_planes; i++ )
 160     {
 161         dest_pic.data[i] = p_dest->p[i].p_pixels;
 162         dest_pic.linesize[i] = p_dest->p[i].i_pitch;
 163     }
 164
 165     /* Special cases */
 166     if( p_filter->p_sys->i_src_vlc_chroma == VLC_FOURCC('Y','V','1','2') ||
 167         p_filter->p_sys->i_src_vlc_chroma == VLC_FOURCC('Y','V','U','9') )
 168     {
 169         /* Invert U and V */
 170         src_pic.data[1] = p_src->p[2].p_pixels;
 171         src_pic.data[2] = p_src->p[1].p_pixels;
 172     }
 173     if( p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','1','2') ||
 174         p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','U','9') )
 175     {
 176         /* Invert U and V */
 177         dest_pic.data[1] = p_dest->p[2].p_pixels;
 178         dest_pic.data[2] = p_dest->p[1].p_pixels;
 179     }
 180     if( p_filter->p_sys->i_src_ffmpeg_chroma == PIX_FMT_RGB24 )
 181         if( p_filter->fmt_in.video.i_bmask == 0x00ff0000 )
 182             p_filter->p_sys->i_src_ffmpeg_chroma = PIX_FMT_BGR24;
 183
 184     if( p_filter->p_sys->p_rsc )
 185     {
 186         img_convert( &p_filter->p_sys->tmp_pic,
 187                      p_filter->p_sys->i_dst_ffmpeg_chroma,
 188                      &src_pic, p_filter->p_sys->i_src_ffmpeg_chroma,
 189                      p_filter->fmt_in.video.i_width,
 190                      p_filter->fmt_in.video.i_height );
 191         img_resample( p_filter->p_sys->p_rsc, &dest_pic,
 192                       &p_filter->p_sys->tmp_pic );
 193     }
 194     else
 195     {
 196         img_convert( &dest_pic, p_filter->p_sys->i_dst_ffmpeg_chroma,
 197                      &src_pic, p_filter->p_sys->i_src_ffmpeg_chroma,
 198                      p_filter->fmt_in.video.i_width,
 199                      p_filter->fmt_in.video.i_height );
 200     }
 201 }
 202
 203 /*****************************************************************************
 204  * CloseFilter: free the chroma function
 205  *****************************************************************************
 206  * This function frees the previously allocated chroma function
 207  *****************************************************************************/
 208 void CloseFilter( vlc_object_t *p_this )
 209 {
 210     filter_t *p_filter = (filter_t *)p_this;
 211     if( p_filter->p_sys->p_rsc )
 212     {
 213         img_resample_close( p_filter->p_sys->p_rsc );
 214         avpicture_free( &p_filter->p_sys->tmp_pic );
 215     }
 216     free( p_filter->p_sys );
 217 }