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

   1 /*****************************************************************************
   2  * video filter: video filter doing chroma conversion and resizing
   3  *               using the ffmpeg library
   4  *****************************************************************************
   5  * Copyright (C) 1999-2001 the VideoLAN team
   6  * $Id$
   7  *
   8  * Authors: 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/vlc.h>
  33 #include <vlc_codec.h>
  34 #include <vlc_vout.h>
  35 #include <vlc_filter.h>
  36
  37 /* ffmpeg header */
  38 #ifdef HAVE_FFMPEG_AVCODEC_H
  39 #   include <ffmpeg/avcodec.h>
  40 #else
  41 #   include <avcodec.h>
  42 #endif
  43
  44 #include "ffmpeg.h"
  45
  46 #if !defined(HAVE_FFMPEG_SWSCALE_H) && !defined(HAVE_LIBSWSCALE_TREE)
  47 void E_(InitLibavcodec) ( vlc_object_t *p_object );
  48 static int CheckInit( filter_t *p_filter );
  49 static picture_t *Process( filter_t *p_filter, picture_t *p_pic );
  50
  51 /*****************************************************************************
  52  * filter_sys_t : filter descriptor
  53  *****************************************************************************/
  54 struct filter_sys_t
  55 {
  56     vlc_bool_t b_resize;
  57     vlc_bool_t b_convert;
  58     vlc_bool_t b_resize_first;
  59     vlc_bool_t b_enable_croppadd;
  60
  61     es_format_t fmt_in;
  62     int i_src_ffmpeg_chroma;
  63     es_format_t fmt_out;
  64     int i_dst_ffmpeg_chroma;
  65
  66     AVPicture tmp_pic;
  67
  68     ImgReSampleContext *p_rsc;
  69 };
  70
  71 /*****************************************************************************
  72  * OpenFilterEx: common code to OpenFilter and OpenCropPadd
  73  *****************************************************************************/
  74 static int OpenFilterEx( vlc_object_t *p_this, vlc_bool_t b_enable_croppadd )
  75 {
  76     filter_t *p_filter = (filter_t*)p_this;
  77     filter_sys_t *p_sys;
  78     vlc_bool_t b_convert, b_resize;
  79
  80     /* Check if we can handle that formats */
  81     if( E_(GetFfmpegChroma)( p_filter->fmt_in.video.i_chroma ) < 0 ||
  82         E_(GetFfmpegChroma)( p_filter->fmt_out.video.i_chroma ) < 0 )
  83     {
  84         return VLC_EGENERIC;
  85     }
  86
  87     b_resize =
  88         ( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ) ||
  89         ( p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height );
  90
  91     if ( b_enable_croppadd )
  92     {
  93         b_resize = b_resize ||
  94            ( p_filter->fmt_in.video.i_visible_width != p_filter->fmt_in.video.i_width ) ||
  95            ( p_filter->fmt_in.video.i_visible_height != p_filter->fmt_in.video.i_height ) ||
  96            ( p_filter->fmt_in.video.i_x_offset != 0 ) ||
  97            ( p_filter->fmt_in.video.i_y_offset != 0 ) ||
  98            ( p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ) ||
  99            ( p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ) ||
 100            ( p_filter->fmt_out.video.i_x_offset != 0 ) ||
 101            ( p_filter->fmt_out.video.i_y_offset != 0 );
 102     }
 103
 104     b_convert =
 105         ( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma );
 106
 107     if( !b_resize && !b_convert )
 108     {
 109         /* Nothing to do */
 110         return VLC_EGENERIC;
 111     }
 112
 113     /* Allocate the memory needed to store the decoder's structure */
 114     if( ( p_filter->p_sys = p_sys =
 115           (filter_sys_t *)malloc(sizeof(filter_sys_t)) ) == NULL )
 116     {
 117         msg_Err( p_filter, "out of memory" );
 118         return VLC_EGENERIC;
 119     }
 120
 121     /* Misc init */
 122     p_sys->p_rsc = NULL;
 123     p_sys->b_enable_croppadd = b_enable_croppadd;
 124     p_sys->i_src_ffmpeg_chroma =
 125         E_(GetFfmpegChroma)( p_filter->fmt_in.video.i_chroma );
 126     p_sys->i_dst_ffmpeg_chroma =
 127         E_(GetFfmpegChroma)( p_filter->fmt_out.video.i_chroma );
 128     p_filter->pf_video_filter = Process;
 129     es_format_Init( &p_sys->fmt_in, 0, 0 );
 130     es_format_Init( &p_sys->fmt_out, 0, 0 );
 131
 132     /* Dummy alloc, will be reallocated in CheckInit */
 133     avpicture_alloc( &p_sys->tmp_pic, p_sys->i_src_ffmpeg_chroma,
 134                      p_filter->fmt_out.video.i_width,
 135                      p_filter->fmt_out.video.i_height );
 136
 137     if( CheckInit( p_filter ) != VLC_SUCCESS )
 138     {
 139         if( p_sys->p_rsc ) img_resample_close( p_sys->p_rsc );
 140         avpicture_free( &p_sys->tmp_pic );
 141         free( p_sys );
 142         return VLC_EGENERIC;
 143     }
 144
 145     msg_Dbg( p_filter, "input: %ix%i %4.4s -> %ix%i %4.4s",
 146              p_filter->fmt_in.video.i_width, p_filter->fmt_in.video.i_height,
 147              (char *)&p_filter->fmt_in.video.i_chroma,
 148              p_filter->fmt_out.video.i_width, p_filter->fmt_out.video.i_height,
 149              (char *)&p_filter->fmt_out.video.i_chroma );
 150
 151     /* libavcodec needs to be initialized for some chroma conversions */
 152     E_(InitLibavcodec)(p_this);
 153
 154     return VLC_SUCCESS;
 155 }
 156
 157 /*****************************************************************************
 158  * OpenFilter: probe the filter and return score
 159  *****************************************************************************/
 160 int E_(OpenFilter)( vlc_object_t *p_this )
 161 {
 162     return OpenFilterEx( p_this, VLC_FALSE );
 163 }
 164
 165 /*****************************************************************************
 166  * OpenCropPadd: probe the filter and return score
 167  *****************************************************************************/
 168 int E_(OpenCropPadd)( vlc_object_t *p_this )
 169 {
 170     return OpenFilterEx( p_this, VLC_TRUE );
 171 }
 172
 173
 174 /*****************************************************************************
 175  * CloseFilter: clean up the filter
 176  *****************************************************************************/
 177 void E_(CloseFilter)( vlc_object_t *p_this )
 178 {
 179     filter_t *p_filter = (filter_t*)p_this;
 180     filter_sys_t *p_sys = p_filter->p_sys;
 181
 182     if( p_sys->p_rsc ) img_resample_close( p_sys->p_rsc );
 183     avpicture_free( &p_sys->tmp_pic );
 184
 185     free( p_sys );
 186 }
 187
 188 /*****************************************************************************
 189  * CheckInit: Initialise filter when necessary
 190  *****************************************************************************/
 191 static int CheckInit( filter_t *p_filter )
 192 {
 193     filter_sys_t *p_sys = p_filter->p_sys;
 194     vlc_bool_t b_change;
 195     int i_croptop=0;
 196     int i_cropbottom=0;
 197     int i_cropleft=0;
 198     int i_cropright=0;
 199     int i_paddtop=0;
 200     int i_paddbottom=0;
 201     int i_paddleft=0;
 202     int i_paddright=0;
 203
 204     b_change = ( p_filter->fmt_in.video.i_width != p_sys->fmt_in.video.i_width ) ||
 205         ( p_filter->fmt_in.video.i_height != p_sys->fmt_in.video.i_height ) ||
 206         ( p_filter->fmt_out.video.i_width != p_sys->fmt_out.video.i_width ) ||
 207         ( p_filter->fmt_out.video.i_height != p_sys->fmt_out.video.i_height );
 208
 209     if ( p_sys->b_enable_croppadd )
 210     {
 211         b_change = b_change ||
 212             ( p_filter->fmt_in.video.i_y_offset != p_sys->fmt_in.video.i_y_offset ) ||
 213             ( p_filter->fmt_in.video.i_x_offset != p_sys->fmt_in.video.i_x_offset ) ||
 214             ( p_filter->fmt_in.video.i_visible_width != p_sys->fmt_in.video.i_visible_width ) ||
 215             ( p_filter->fmt_in.video.i_visible_height != p_sys->fmt_in.video.i_visible_height ) ||
 216             ( p_filter->fmt_out.video.i_y_offset != p_sys->fmt_out.video.i_y_offset ) ||
 217             ( p_filter->fmt_out.video.i_x_offset != p_sys->fmt_out.video.i_x_offset ) ||
 218             ( p_filter->fmt_out.video.i_visible_width != p_sys->fmt_out.video.i_visible_width ) ||
 219             ( p_filter->fmt_out.video.i_visible_height != p_sys->fmt_out.video.i_visible_height );
 220     }
 221
 222     if ( b_change )
 223     {
 224         if( p_sys->p_rsc ) img_resample_close( p_sys->p_rsc );
 225
 226         p_sys->p_rsc = NULL;
 227         p_sys->b_convert =
 228           ( p_filter->fmt_in.video.i_chroma != p_filter->fmt_out.video.i_chroma );
 229
 230         p_sys->b_resize =
 231           ( p_filter->fmt_in.video.i_width != p_filter->fmt_out.video.i_width ) ||
 232           ( p_filter->fmt_in.video.i_height != p_filter->fmt_out.video.i_height );
 233
 234         p_sys->b_resize_first =
 235           ( p_filter->fmt_in.video.i_width * p_filter->fmt_in.video.i_height ) >
 236           ( p_filter->fmt_out.video.i_width * p_filter->fmt_out.video.i_height );
 237
 238         if( p_sys->b_resize &&
 239             ( p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUV420P ) &&
 240             ( p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUVJ420P ) &&
 241             ( p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUV420P ) &&
 242             ( p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUVJ420P ) )
 243         {
 244             msg_Err( p_filter, "img_resample_init only deals with I420" );
 245             return VLC_EGENERIC;
 246         }
 247         else if( ( p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUV420P ) &&
 248                  ( p_sys->i_src_ffmpeg_chroma != PIX_FMT_YUVJ420P ) )
 249         {
 250             p_sys->b_resize_first = VLC_FALSE;
 251         }
 252         else if( ( p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUV420P ) &&
 253                  ( p_sys->i_dst_ffmpeg_chroma != PIX_FMT_YUVJ420P ) )
 254         {
 255             p_sys->b_resize_first = VLC_TRUE;
 256         }
 257
 258         if ( p_sys->b_enable_croppadd )
 259         {
 260             p_sys->b_resize = p_sys->b_resize ||
 261                 ( p_filter->fmt_in.video.i_visible_width != p_filter->fmt_in.video.i_width ) ||
 262                 ( p_filter->fmt_in.video.i_visible_height != p_filter->fmt_in.video.i_height ) ||
 263                 ( p_filter->fmt_in.video.i_x_offset != 0 ) ||
 264                 ( p_filter->fmt_in.video.i_y_offset != 0 ) ||
 265                 ( p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ) ||
 266                 ( p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ) ||
 267                 ( p_filter->fmt_out.video.i_x_offset != 0 ) ||
 268                 ( p_filter->fmt_out.video.i_y_offset != 0 );
 269         }
 270
 271         if( p_sys->b_resize )
 272         {
 273             if ( p_sys->b_enable_croppadd )
 274             {
 275                 i_croptop = p_filter->fmt_in.video.i_y_offset;
 276                 i_cropbottom = p_filter->fmt_in.video.i_height
 277                                        - p_filter->fmt_in.video.i_visible_height
 278                                        - p_filter->fmt_in.video.i_y_offset;
 279                 i_cropleft = p_filter->fmt_in.video.i_x_offset;
 280                 i_cropright = p_filter->fmt_in.video.i_width
 281                                       - p_filter->fmt_in.video.i_visible_width
 282                                       - p_filter->fmt_in.video.i_x_offset;
 283
 284
 285                 i_paddtop = p_filter->fmt_out.video.i_y_offset;
 286                 i_paddbottom = p_filter->fmt_out.video.i_height
 287                                        - p_filter->fmt_out.video.i_visible_height
 288                                        - p_filter->fmt_out.video.i_y_offset;
 289                 i_paddleft = p_filter->fmt_out.video.i_x_offset;
 290                 i_paddright = p_filter->fmt_out.video.i_width
 291                                       - p_filter->fmt_out.video.i_visible_width
 292                                       - p_filter->fmt_out.video.i_x_offset;
 293             }
 294
 295             p_sys->p_rsc = img_resample_full_init(
 296                                p_filter->fmt_out.video.i_width,
 297                                p_filter->fmt_out.video.i_height,
 298                                p_filter->fmt_in.video.i_width,
 299                                p_filter->fmt_in.video.i_height,
 300                                i_croptop,i_cropbottom,
 301                                i_cropleft,i_cropright,
 302                                i_paddtop,i_paddbottom,
 303                                i_paddleft,i_paddright );
 304
 305             if( !p_sys->p_rsc )
 306             {
 307                 msg_Err( p_filter, "img_resample_init failed" );
 308                 return VLC_EGENERIC;
 309             }
 310
 311             msg_Dbg( p_filter, "input: %ix%i -> %ix%i",
 312                 p_filter->fmt_out.video.i_width,
 313                 p_filter->fmt_out.video.i_height,
 314                 p_filter->fmt_in.video.i_width,
 315                 p_filter->fmt_in.video.i_height);
 316
 317         }
 318
 319         avpicture_free( &p_sys->tmp_pic );
 320
 321         if( p_sys->b_resize_first )
 322         {
 323             /* Resizing then conversion */
 324             avpicture_alloc( &p_sys->tmp_pic, p_sys->i_src_ffmpeg_chroma,
 325                              p_filter->fmt_out.video.i_width,
 326                              p_filter->fmt_out.video.i_height );
 327         }
 328         else
 329         {
 330             /* Conversion then resizing */
 331             avpicture_alloc( &p_sys->tmp_pic, p_sys->i_dst_ffmpeg_chroma,
 332                              p_filter->fmt_in.video.i_width,
 333                              p_filter->fmt_in.video.i_height );
 334         }
 335
 336         p_sys->fmt_in = p_filter->fmt_in;
 337         p_sys->fmt_out = p_filter->fmt_out;
 338     }
 339
 340     return VLC_SUCCESS;
 341 }
 342
 343 /* fill padd code from ffmpeg */
 344 static int padcolor[3] = { 16, 128, 128 };
 345
 346 /* Expects img to be yuv420 */
 347 static void fill_pad_region( AVPicture* img, int height, int width,
 348         int padtop, int padbottom, int padleft, int padright, int *color )
 349 {
 350     int i, y, shift;
 351     uint8_t *optr;
 352
 353     for ( i = 0; i < 3; i++ )
 354     {
 355         shift = ( i == 0 ) ? 0 : 1;
 356
 357         if ( padtop || padleft )
 358         {
 359             memset( img->data[i], color[i], ( ( ( img->linesize[i] * padtop ) +
 360                             padleft ) >> shift) );
 361         }
 362
 363         if ( padleft || padright )
 364         {
 365             optr = img->data[i] + ( img->linesize[i] * ( padtop >> shift ) ) +
 366                 ( img->linesize[i] - ( padright >> shift ) );
 367
 368             for ( y = 0; y < ( ( height - ( padtop + padbottom ) ) >> shift ); y++ )
 369             {
 370                 memset( optr, color[i], ( padleft + padright ) >> shift );
 371                 optr += img->linesize[i];
 372             }
 373         }
 374
 375         if (padbottom)
 376         {
 377             optr = img->data[i] + ( img->linesize[i] * ( ( height - padbottom ) >> shift ) );
 378             memset( optr, color[i], ( ( img->linesize[i] * padbottom ) >> shift ) );
 379         }
 380     }
 381 }
 382
 383 /* Workaround, because old libavcodec doesnt know how to padd */
 384 static void img_resample_padd( ImgReSampleContext *s, AVPicture *output,
 385         const AVPicture *input, int padtop, int padleft )
 386 {
 387     AVPicture nopadd_pic = *output;
 388
 389     /* shift out top and left padding for old ffmpeg */
 390     nopadd_pic.data[0] += ( nopadd_pic.linesize[0] * padtop + padleft );
 391     nopadd_pic.data[1] += ( nopadd_pic.linesize[1] * padtop + padleft ) >> 1;
 392     nopadd_pic.data[2] += ( nopadd_pic.linesize[2] * padtop + padleft ) >> 1;
 393     img_resample( s, &nopadd_pic, input );
 394 }
 395
 396
 397 /*****************************************************************************
 398  * Do the processing here
 399  *****************************************************************************/
 400 static picture_t *Process( filter_t *p_filter, picture_t *p_pic )
 401 {
 402     filter_sys_t *p_sys = p_filter->p_sys;
 403     AVPicture src_pic, dest_pic;
 404     AVPicture *p_src, *p_dst;
 405     picture_t *p_pic_dst;
 406     int i;
 407
 408     /* Check if format properties changed */
 409     if( CheckInit( p_filter ) != VLC_SUCCESS ) return 0;
 410
 411     /* Request output picture */
 412     p_pic_dst = p_filter->pf_vout_buffer_new( p_filter );
 413     if( !p_pic_dst )
 414     {
 415         msg_Warn( p_filter, "can't get output picture" );
 416         p_pic->pf_release( p_pic );
 417         return NULL;
 418     }
 419
 420     /* Prepare the AVPictures for the conversion */
 421     for( i = 0; i < p_pic->i_planes; i++ )
 422     {
 423         src_pic.data[i] = p_pic->p[i].p_pixels;
 424         src_pic.linesize[i] = p_pic->p[i].i_pitch;
 425     }
 426     for( i = 0; i < p_pic_dst->i_planes; i++ )
 427     {
 428         dest_pic.data[i] = p_pic_dst->p[i].p_pixels;
 429         dest_pic.linesize[i] = p_pic_dst->p[i].i_pitch;
 430     }
 431
 432     /* Special cases */
 433     if( p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','V','1','2') ||
 434         p_filter->fmt_in.video.i_chroma == VLC_FOURCC('Y','V','U','9') )
 435     {
 436         /* Invert U and V */
 437         src_pic.data[1] = p_pic->p[2].p_pixels;
 438         src_pic.data[2] = p_pic->p[1].p_pixels;
 439     }
 440     if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','1','2') ||
 441         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','V','U','9') )
 442     {
 443         /* Invert U and V */
 444         dest_pic.data[1] = p_pic_dst->p[2].p_pixels;
 445         dest_pic.data[2] = p_pic_dst->p[1].p_pixels;
 446     }
 447     if( p_sys->i_src_ffmpeg_chroma == PIX_FMT_RGB24 )
 448         if( p_filter->fmt_in.video.i_bmask == 0x00ff0000 )
 449             p_sys->i_src_ffmpeg_chroma = PIX_FMT_BGR24;
 450
 451     p_src = &src_pic;
 452
 453     if( p_sys->b_resize && p_sys->p_rsc )
 454     {
 455         p_dst = &dest_pic;
 456         if( p_sys->b_resize_first )
 457         {
 458             if( p_sys->b_convert ) p_dst = &p_sys->tmp_pic;
 459
 460             img_resample( p_sys->p_rsc, p_dst, p_src );
 461
 462             if (p_sys->b_enable_croppadd)
 463             {
 464                 if (p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ||
 465                     p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ||
 466                     p_filter->fmt_out.video.i_x_offset != 0 ||
 467                     p_filter->fmt_out.video.i_y_offset != 0)
 468                 {
 469                     fill_pad_region(p_dst, p_filter->fmt_out.video.i_height,
 470                                     p_filter->fmt_out.video.i_width,
 471                                     p_filter->fmt_out.video.i_y_offset,
 472                                     p_filter->fmt_out.video.i_height
 473                                       - p_filter->fmt_out.video.i_visible_height
 474                                       - p_filter->fmt_out.video.i_y_offset,
 475                                     p_filter->fmt_out.video.i_x_offset,
 476                                     p_filter->fmt_out.video.i_width
 477                                       - p_filter->fmt_out.video.i_visible_width
 478                                       - p_filter->fmt_out.video.i_x_offset,
 479                                     padcolor);
 480                 }
 481             }
 482
 483             p_src = p_dst;
 484         }
 485     }
 486
 487     if( p_sys->b_convert )
 488     {
 489         video_format_t *p_fmt = &p_filter->fmt_out.video;
 490         p_dst = &dest_pic;
 491         if( p_sys->b_resize && !p_sys->b_resize_first )
 492         {
 493             p_dst = &p_sys->tmp_pic;
 494             p_fmt = &p_filter->fmt_in.video;
 495         }
 496
 497         img_convert( p_dst, p_sys->i_dst_ffmpeg_chroma,
 498                      p_src, p_sys->i_src_ffmpeg_chroma,
 499                      p_fmt->i_width, p_fmt->i_height );
 500
 501         p_src = p_dst;
 502     }
 503
 504     if( p_sys->b_resize && !p_sys->b_resize_first && p_sys->p_rsc )
 505     {
 506         p_dst = &dest_pic;
 507
 508         img_resample( p_sys->p_rsc, p_dst, p_src );
 509
 510         if (p_sys->b_enable_croppadd)
 511         {
 512             if (p_filter->fmt_out.video.i_visible_width != p_filter->fmt_out.video.i_width ||
 513                 p_filter->fmt_out.video.i_visible_height != p_filter->fmt_out.video.i_height ||
 514                 p_filter->fmt_out.video.i_x_offset != 0 ||
 515                 p_filter->fmt_out.video.i_y_offset != 0)
 516             {
 517                 fill_pad_region(p_dst, p_filter->fmt_out.video.i_height,
 518                                 p_filter->fmt_out.video.i_width,
 519                                 p_filter->fmt_out.video.i_y_offset,
 520                                 p_filter->fmt_out.video.i_height
 521                                   - p_filter->fmt_out.video.i_visible_height
 522                                   - p_filter->fmt_out.video.i_y_offset,
 523                                 p_filter->fmt_out.video.i_x_offset,
 524                                 p_filter->fmt_out.video.i_width
 525                                   - p_filter->fmt_out.video.i_visible_width
 526                                   - p_filter->fmt_out.video.i_x_offset,
 527                                 padcolor);
 528             }
 529         }
 530     }
 531
 532     /* Special case for RV32 -> YUVA */
 533     if( !p_sys->b_resize &&
 534         p_filter->fmt_in.video.i_chroma == VLC_FOURCC('R','V','3','2') &&
 535         p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','V','A') )
 536     {
 537         uint8_t *p_src = p_pic->p[0].p_pixels;
 538         int i_src_pitch = p_pic->p[0].i_pitch;
 539         uint8_t *p_dst = p_pic_dst->p[3].p_pixels;
 540         int i_dst_pitch = p_pic_dst->p[3].i_pitch;
 541         uint32_t l,j;
 542
 543         for( l = 0; l < p_filter->fmt_out.video.i_height; l++ )
 544         {
 545             for( j = 0; j < p_filter->fmt_out.video.i_width; j++ )
 546             {
 547               p_dst[j] = p_src[j*4+3];
 548             }
 549             p_src += i_src_pitch;
 550             p_dst += i_dst_pitch;
 551         }
 552     }
 553     else if( p_filter->fmt_out.video.i_chroma == VLC_FOURCC('Y','U','V','A') )
 554     {
 555         /* Special case for YUVA */
 556         memset( p_pic_dst->p[3].p_pixels, 0xFF,
 557                 p_pic_dst->p[3].i_pitch * p_pic_dst->p[3].i_lines );
 558     }
 559
 560     p_pic_dst->date = p_pic->date;
 561     p_pic_dst->b_force = p_pic->b_force;
 562     p_pic_dst->i_nb_fields = p_pic->i_nb_fields;
 563     p_pic_dst->b_progressive = p_pic->b_progressive;
 564     p_pic_dst->b_top_field_first = p_pic->b_top_field_first;
 565
 566     p_pic->pf_release( p_pic );
 567     return p_pic_dst;
 568 }
 569 #endif /* ( (defined(HAVE_FFMPEG_SWSCALE_H) || defined(HAVE_LIBSWSCALE_TREE)) */