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/avcodec.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];
  91
  92     /*
  93      * Check the source chroma first, then the destination chroma
  94      */
  95     if( GetFfmpegChroma( &i_ffmpeg_chroma[0], p_filter->fmt_in.video ) == VLC_EGENERIC )
  96         return VLC_EGENERIC;
  97     if( GetFfmpegChroma( &i_ffmpeg_chroma[1], p_filter->fmt_out.video ) == VLC_EGENERIC )
  98         return VLC_EGENERIC;
  99
 100     p_filter->pf_video_filter = Conversion_Filter;
 101
 102     p_filter->p_sys = malloc( sizeof( filter_sys_t ) );
 103     if( p_filter->p_sys == NULL )
 104     {
 105         return VLC_ENOMEM;
 106     }
 107
 108     p_filter->p_sys->i_src_vlc_chroma = p_filter->fmt_in.video.i_chroma;
 109     p_filter->p_sys->i_dst_vlc_chroma = p_filter->fmt_out.video.i_chroma;
 110     p_filter->p_sys->i_src_ffmpeg_chroma = i_ffmpeg_chroma[0];
 111     p_filter->p_sys->i_dst_ffmpeg_chroma = i_ffmpeg_chroma[1];
 112
 113     if( ( p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height ||
 114           p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ) &&
 115         ( p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('I','4','2','0') ||
 116           p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','1','2') ))
 117     {
 118         msg_Dbg( p_filter, "preparing to resample picture" );
 119         p_filter->p_sys->p_rsc =
 120             img_resample_init( p_filter->fmt_out.video.i_width,
 121                                p_filter->fmt_out.video.i_height,
 122                                p_filter->fmt_in.video.i_width,
 123                                p_filter->fmt_in.video.i_height );
 124         avpicture_alloc( &p_filter->p_sys->tmp_pic,
 125                          p_filter->p_sys->i_dst_ffmpeg_chroma,
 126                          p_filter->fmt_in.video.i_width,
 127                          p_filter->fmt_in.video.i_height );
 128     }
 129     else
 130     {
 131         msg_Dbg( p_filter, "no resampling" );
 132         p_filter->p_sys->p_rsc = NULL;
 133     }
 134
 135     return VLC_SUCCESS;
 136 }
 137
 138 VIDEO_FILTER_WRAPPER( Conversion )
 139
 140 /*****************************************************************************
 141  * ChromaConversion: actual chroma conversion function
 142  *****************************************************************************/
 143 static void Conversion( filter_t *p_filter,
 144                         picture_t *p_src, picture_t *p_dest )
 145 {
 146     AVPicture src_pic;
 147     AVPicture dest_pic;
 148     int i;
 149
 150     /* Prepare the AVPictures for converion */
 151     for( i = 0; i < p_src->i_planes; i++ )
 152     {
 153         src_pic.data[i] = p_src->p[i].p_pixels;
 154         src_pic.linesize[i] = p_src->p[i].i_pitch;
 155     }
 156     for( i = 0; i < p_dest->i_planes; i++ )
 157     {
 158         dest_pic.data[i] = p_dest->p[i].p_pixels;
 159         dest_pic.linesize[i] = p_dest->p[i].i_pitch;
 160     }
 161
 162     /* Special cases */
 163     if( p_filter->p_sys->i_src_vlc_chroma == VLC_FOURCC('Y','V','1','2') ||
 164         p_filter->p_sys->i_src_vlc_chroma == VLC_FOURCC('Y','V','U','9') )
 165     {
 166         /* Invert U and V */
 167         src_pic.data[1] = p_src->p[2].p_pixels;
 168         src_pic.data[2] = p_src->p[1].p_pixels;
 169     }
 170     if( p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','1','2') ||
 171         p_filter->p_sys->i_dst_vlc_chroma == VLC_FOURCC('Y','V','U','9') )
 172     {
 173         /* Invert U and V */
 174         dest_pic.data[1] = p_dest->p[2].p_pixels;
 175         dest_pic.data[2] = p_dest->p[1].p_pixels;
 176     }
 177     if( p_filter->p_sys->i_src_ffmpeg_chroma == PIX_FMT_RGB24 )
 178         if( p_filter->fmt_in.video.i_bmask == 0x00ff0000 )
 179             p_filter->p_sys->i_src_ffmpeg_chroma = PIX_FMT_BGR24;
 180
 181     if( p_filter->p_sys->p_rsc )
 182     {
 183         img_convert( &p_filter->p_sys->tmp_pic,
 184                      p_filter->p_sys->i_dst_ffmpeg_chroma,
 185                      &src_pic, p_filter->p_sys->i_src_ffmpeg_chroma,
 186                      p_filter->fmt_in.video.i_width,
 187                      p_filter->fmt_in.video.i_height );
 188         img_resample( p_filter->p_sys->p_rsc, &dest_pic,
 189                       &p_filter->p_sys->tmp_pic );
 190     }
 191     else
 192     {
 193         img_convert( &dest_pic, p_filter->p_sys->i_dst_ffmpeg_chroma,
 194                      &src_pic, p_filter->p_sys->i_src_ffmpeg_chroma,
 195                      p_filter->fmt_in.video.i_width,
 196                      p_filter->fmt_in.video.i_height );
 197     }
 198 }
 199
 200 /*****************************************************************************
 201  * CloseFilter: free the chroma function
 202  *****************************************************************************
 203  * This function frees the previously allocated chroma function
 204  *****************************************************************************/
 205 void CloseFilter( vlc_object_t *p_this )
 206 {
 207     filter_t *p_filter = (filter_t *)p_this;
 208     if( p_filter->p_sys->p_rsc )
 209     {
 210         img_resample_close( p_filter->p_sys->p_rsc );
 211         avpicture_free( &p_filter->p_sys->tmp_pic );
 212     }
 213     free( p_filter->p_sys );
 214 }