modules/video_filter/swscale.c

   1 /*****************************************************************************
   2  * swscale.c: scaling and chroma conversion using libswscale
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 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 #include <assert.h>
  32
  33 #include <vlc_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_filter.h>
  36 #include <vlc_cpu.h>
  37
  38 #include <libswscale/swscale.h>
  39
  40 #include "../codec/avcodec/chroma.h" // Chroma Avutil <-> VLC conversion
  41
  42 /* Gruikkkkkkkkkk!!!!! */
  43 #undef AVPALETTE_SIZE
  44 #define AVPALETTE_SIZE (256 * sizeof(uint32_t))
  45
  46 /*****************************************************************************
  47  * Module descriptor
  48  *****************************************************************************/
  49 static int  OpenScaler( vlc_object_t * );
  50 static void CloseScaler( vlc_object_t * );
  51
  52 #define SCALEMODE_TEXT N_("Scaling mode")
  53 #define SCALEMODE_LONGTEXT N_("Scaling mode to use.")
  54
  55 static const int pi_mode_values[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  56 const char *const ppsz_mode_descriptions[] =
  57 { N_("Fast bilinear"), N_("Bilinear"), N_("Bicubic (good quality)"),
  58   N_("Experimental"), N_("Nearest neighbour (bad quality)"),
  59   N_("Area"), N_("Luma bicubic / chroma bilinear"), N_("Gauss"),
  60   N_("SincR"), N_("Lanczos"), N_("Bicubic spline") };
  61
  62 vlc_module_begin ()
  63     set_description( N_("Video scaling filter") )
  64     set_shortname( N_("Swscale" ) )
  65     set_capability( "video filter2", 150 )
  66     set_category( CAT_VIDEO )
  67     set_subcategory( SUBCAT_VIDEO_VFILTER )
  68     set_callbacks( OpenScaler, CloseScaler )
  69     add_integer( "swscale-mode", 2, SCALEMODE_TEXT, SCALEMODE_LONGTEXT, true )
  70         change_integer_list( pi_mode_values, ppsz_mode_descriptions )
  71 vlc_module_end ()
  72
  73 /* Version checking */
  74 #if LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0)
  75 /****************************************************************************
  76  * Local prototypes
  77  ****************************************************************************/
  78
  79 void *( *swscale_fast_memcpy )( void *, const void *, size_t );
  80
  81 /**
  82  * Internal swscale filter structure.
  83  */
  84 struct filter_sys_t
  85 {
  86     SwsFilter *p_src_filter;
  87     SwsFilter *p_dst_filter;
  88     int i_cpu_mask, i_sws_flags;
  89
  90     video_format_t fmt_in;
  91     video_format_t fmt_out;
  92
  93     struct SwsContext *ctx;
  94     struct SwsContext *ctxA;
  95     picture_t *p_src_a;
  96     picture_t *p_dst_a;
  97     int i_extend_factor;
  98     picture_t *p_src_e;
  99     picture_t *p_dst_e;
 100     bool b_add_a;
 101     bool b_copy;
 102     bool b_swap_uvi;
 103     bool b_swap_uvo;
 104 };
 105
 106 static picture_t *Filter( filter_t *, picture_t * );
 107 static int  Init( filter_t * );
 108 static void Clean( filter_t * );
 109
 110 typedef struct
 111 {
 112     int  i_fmti;
 113     int  i_fmto;
 114     bool b_has_a;
 115     bool b_add_a;
 116     int  i_sws_flags;
 117     bool b_copy;
 118     bool b_swap_uvi;
 119     bool b_swap_uvo;
 120 } ScalerConfiguration;
 121
 122 static int GetParameters( ScalerConfiguration *,
 123                           const video_format_t *p_fmti,
 124                           const video_format_t *p_fmto,
 125                           int i_sws_flags_default );
 126
 127 static int GetSwsCpuMask(void);
 128
 129 /* SwScaler point resize quality seems really bad, let our scale module do it
 130  * (change it to true to try) */
 131 #define ALLOW_YUVP (false)
 132 /* SwScaler does not like too small picture */
 133 #define MINIMUM_WIDTH (32)
 134
 135 /* XXX is it always 3 even for BIG_ENDIAN (blend.c seems to think so) ? */
 136 #define OFFSET_A (3)
 137
 138 /*****************************************************************************
 139  * OpenScaler: probe the filter and return score
 140  *****************************************************************************/
 141 static int OpenScaler( vlc_object_t *p_this )
 142 {
 143     filter_t *p_filter = (filter_t*)p_this;
 144     filter_sys_t *p_sys;
 145
 146     int i_sws_mode;
 147
 148     if( GetParameters( NULL,
 149                        &p_filter->fmt_in.video,
 150                        &p_filter->fmt_out.video, 0 ) )
 151         return VLC_EGENERIC;
 152
 153     /* */
 154     p_filter->pf_video_filter = Filter;
 155     /* Allocate the memory needed to store the decoder's structure */
 156     if( ( p_filter->p_sys = p_sys = malloc(sizeof(filter_sys_t)) ) == NULL )
 157         return VLC_ENOMEM;
 158
 159     /* FIXME pointer assignment may not be atomic */
 160     swscale_fast_memcpy = vlc_memcpy;
 161
 162     /* Set CPU capabilities */
 163     p_sys->i_cpu_mask = GetSwsCpuMask();
 164
 165     /* */
 166     i_sws_mode = var_CreateGetInteger( p_filter, "swscale-mode" );
 167     switch( i_sws_mode )
 168     {
 169     case 0:  p_sys->i_sws_flags = SWS_FAST_BILINEAR; break;
 170     case 1:  p_sys->i_sws_flags = SWS_BILINEAR; break;
 171     case 2:  p_sys->i_sws_flags = SWS_BICUBIC; break;
 172     case 3:  p_sys->i_sws_flags = SWS_X; break;
 173     case 4:  p_sys->i_sws_flags = SWS_POINT; break;
 174     case 5:  p_sys->i_sws_flags = SWS_AREA; break;
 175     case 6:  p_sys->i_sws_flags = SWS_BICUBLIN; break;
 176     case 7:  p_sys->i_sws_flags = SWS_GAUSS; break;
 177     case 8:  p_sys->i_sws_flags = SWS_SINC; break;
 178     case 9:  p_sys->i_sws_flags = SWS_LANCZOS; break;
 179     case 10: p_sys->i_sws_flags = SWS_SPLINE; break;
 180     default: p_sys->i_sws_flags = SWS_BICUBIC; i_sws_mode = 2; break;
 181     }
 182
 183     p_sys->p_src_filter = NULL;
 184     p_sys->p_dst_filter = NULL;
 185
 186     /* Misc init */
 187     p_sys->ctx = NULL;
 188     p_sys->ctxA = NULL;
 189     p_sys->p_src_a = NULL;
 190     p_sys->p_dst_a = NULL;
 191     p_sys->p_src_e = NULL;
 192     p_sys->p_dst_e = NULL;
 193     memset( &p_sys->fmt_in,  0, sizeof(p_sys->fmt_in) );
 194     memset( &p_sys->fmt_out, 0, sizeof(p_sys->fmt_out) );
 195
 196     if( Init( p_filter ) )
 197     {
 198         if( p_sys->p_src_filter )
 199             sws_freeFilter( p_sys->p_src_filter );
 200         free( p_sys );
 201         return VLC_EGENERIC;
 202     }
 203
 204     msg_Dbg( p_filter, "%ix%i chroma: %4.4s -> %ix%i chroma: %4.4s with scaling using %s",
 205              p_filter->fmt_in.video.i_width, p_filter->fmt_in.video.i_height,
 206              (char *)&p_filter->fmt_in.video.i_chroma,
 207              p_filter->fmt_out.video.i_width, p_filter->fmt_out.video.i_height,
 208              (char *)&p_filter->fmt_out.video.i_chroma,
 209              ppsz_mode_descriptions[i_sws_mode] );
 210
 211     return VLC_SUCCESS;
 212 }
 213
 214 /*****************************************************************************
 215  * CloseFilter: clean up the filter
 216  *****************************************************************************/
 217 static void CloseScaler( vlc_object_t *p_this )
 218 {
 219     filter_t *p_filter = (filter_t*)p_this;
 220     filter_sys_t *p_sys = p_filter->p_sys;
 221
 222     Clean( p_filter );
 223     if( p_sys->p_src_filter )
 224         sws_freeFilter( p_sys->p_src_filter );
 225     free( p_sys );
 226 }
 227
 228 /*****************************************************************************
 229  * Helpers
 230  *****************************************************************************/
 231 static int GetSwsCpuMask(void)
 232 {
 233     const unsigned int i_cpu = vlc_CPU();
 234     int i_sws_cpu = 0;
 235
 236     if( i_cpu & CPU_CAPABILITY_MMX )
 237         i_sws_cpu |= SWS_CPU_CAPS_MMX;
 238 #if (LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0))
 239     if( i_cpu & CPU_CAPABILITY_MMXEXT )
 240         i_sws_cpu |= SWS_CPU_CAPS_MMX2;
 241 #endif
 242     if( i_cpu & CPU_CAPABILITY_3DNOW )
 243         i_sws_cpu |= SWS_CPU_CAPS_3DNOW;
 244
 245     if( i_cpu & CPU_CAPABILITY_ALTIVEC )
 246         i_sws_cpu |= SWS_CPU_CAPS_ALTIVEC;
 247
 248     return i_sws_cpu;
 249 }
 250 static bool IsFmtSimilar( const video_format_t *p_fmt1, const video_format_t *p_fmt2 )
 251 {
 252     return p_fmt1->i_chroma == p_fmt2->i_chroma &&
 253            p_fmt1->i_width  == p_fmt2->i_width &&
 254            p_fmt1->i_height == p_fmt2->i_height;
 255 }
 256
 257 static void FixParameters( int *pi_fmt, bool *pb_has_a, bool *pb_swap_uv, vlc_fourcc_t fmt )
 258 {
 259     switch( fmt )
 260     {
 261     case VLC_CODEC_YUVA:
 262         *pi_fmt = PIX_FMT_YUV444P;
 263         *pb_has_a = true;
 264         break;
 265     case VLC_CODEC_RGBA:
 266         *pi_fmt = PIX_FMT_BGR32;
 267         *pb_has_a = true;
 268         break;
 269     case VLC_CODEC_YV12:
 270         *pi_fmt = PIX_FMT_YUV420P;
 271         *pb_swap_uv = true;
 272         break;
 273     case VLC_CODEC_YV9:
 274         *pi_fmt = PIX_FMT_YUV410P;
 275         *pb_swap_uv = true;
 276         break;
 277     default:
 278         break;
 279     }
 280 }
 281
 282 static int GetParameters( ScalerConfiguration *p_cfg,
 283                           const video_format_t *p_fmti,
 284                           const video_format_t *p_fmto,
 285                           int i_sws_flags_default )
 286 {
 287     int i_fmti = -1;
 288     int i_fmto = -1;
 289
 290     bool b_has_ai = false;
 291     bool b_has_ao = false;
 292     int i_sws_flags = i_sws_flags_default;
 293     bool b_swap_uvi = false;
 294     bool b_swap_uvo = false;
 295
 296     GetFfmpegChroma( &i_fmti, *p_fmti );
 297     GetFfmpegChroma( &i_fmto, *p_fmto );
 298
 299     if( p_fmti->i_chroma == p_fmto->i_chroma )
 300     {
 301         if( p_fmti->i_chroma == VLC_CODEC_YUVP && ALLOW_YUVP )
 302         {
 303             i_fmti = i_fmto = PIX_FMT_GRAY8;
 304             i_sws_flags = SWS_POINT;
 305         }
 306     }
 307
 308     FixParameters( &i_fmti, &b_has_ai, &b_swap_uvi, p_fmti->i_chroma );
 309     FixParameters( &i_fmto, &b_has_ao, &b_swap_uvo, p_fmto->i_chroma );
 310
 311     /* FIXME TODO removed when ffmpeg is fixed
 312      * Without SWS_ACCURATE_RND the quality is really bad for some conversions */
 313     switch( i_fmto )
 314     {
 315     case PIX_FMT_ARGB:
 316     case PIX_FMT_RGBA:
 317     case PIX_FMT_ABGR:
 318         i_sws_flags |= SWS_ACCURATE_RND;
 319         break;
 320     }
 321
 322     if( p_cfg )
 323     {
 324         p_cfg->i_fmti = i_fmti;
 325         p_cfg->i_fmto = i_fmto;
 326         p_cfg->b_has_a = b_has_ai && b_has_ao;
 327         p_cfg->b_add_a = (!b_has_ai) && b_has_ao;
 328         p_cfg->b_copy = i_fmti == i_fmto &&
 329                         p_fmti->i_width == p_fmto->i_width &&
 330                         p_fmti->i_height == p_fmto->i_height;
 331         p_cfg->b_swap_uvi = b_swap_uvi;
 332         p_cfg->b_swap_uvo = b_swap_uvo;
 333         p_cfg->i_sws_flags = i_sws_flags;
 334     }
 335
 336     if( i_fmti < 0 || i_fmto < 0 )
 337         return VLC_EGENERIC;
 338
 339     return VLC_SUCCESS;
 340 }
 341
 342 static int Init( filter_t *p_filter )
 343 {
 344     filter_sys_t *p_sys = p_filter->p_sys;
 345     const video_format_t *p_fmti = &p_filter->fmt_in.video;
 346     video_format_t       *p_fmto = &p_filter->fmt_out.video;
 347
 348     if( IsFmtSimilar( p_fmti, &p_sys->fmt_in ) &&
 349         IsFmtSimilar( p_fmto, &p_sys->fmt_out ) &&
 350         p_sys->ctx )
 351     {
 352         return VLC_SUCCESS;
 353     }
 354     Clean( p_filter );
 355
 356     /* Init with new parameters */
 357     ScalerConfiguration cfg;
 358     if( GetParameters( &cfg, p_fmti, p_fmto, p_sys->i_sws_flags ) )
 359     {
 360         msg_Err( p_filter, "format not supported" );
 361         return VLC_EGENERIC;
 362     }
 363     if( p_fmti->i_width <= 0 || p_fmto->i_width <= 0 )
 364     {
 365         msg_Err( p_filter, "0 width not supported" );
 366         return VLC_EGENERIC;
 367     }
 368
 369     /* swscale does not like too small width */
 370     p_sys->i_extend_factor = 1;
 371     while( __MIN( p_fmti->i_width, p_fmto->i_width ) * p_sys->i_extend_factor < MINIMUM_WIDTH)
 372         p_sys->i_extend_factor++;
 373
 374     const unsigned i_fmti_width = p_fmti->i_width * p_sys->i_extend_factor;
 375     const unsigned i_fmto_width = p_fmto->i_width * p_sys->i_extend_factor;
 376     for( int n = 0; n < (cfg.b_has_a ? 2 : 1); n++ )
 377     {
 378         const int i_fmti = n == 0 ? cfg.i_fmti : PIX_FMT_GRAY8;
 379         const int i_fmto = n == 0 ? cfg.i_fmto : PIX_FMT_GRAY8;
 380         struct SwsContext *ctx;
 381
 382         ctx = sws_getContext( i_fmti_width, p_fmti->i_height, i_fmti,
 383                               i_fmto_width, p_fmto->i_height, i_fmto,
 384                               cfg.i_sws_flags | p_sys->i_cpu_mask,
 385                               p_sys->p_src_filter, p_sys->p_dst_filter, 0 );
 386         if( n == 0 )
 387             p_sys->ctx = ctx;
 388         else
 389             p_sys->ctxA = ctx;
 390     }
 391     if( p_sys->ctxA )
 392     {
 393         p_sys->p_src_a = picture_New( VLC_CODEC_GREY, i_fmti_width, p_fmti->i_height, 0, 1 );
 394         p_sys->p_dst_a = picture_New( VLC_CODEC_GREY, i_fmto_width, p_fmto->i_height, 0, 1 );
 395     }
 396     if( p_sys->i_extend_factor != 1 )
 397     {
 398         p_sys->p_src_e = picture_New( p_fmti->i_chroma, i_fmti_width, p_fmti->i_height, 0, 1 );
 399         p_sys->p_dst_e = picture_New( p_fmto->i_chroma, i_fmto_width, p_fmto->i_height, 0, 1 );
 400
 401         if( p_sys->p_src_e )
 402             memset( p_sys->p_src_e->p[0].p_pixels, 0, p_sys->p_src_e->p[0].i_pitch * p_sys->p_src_e->p[0].i_lines );
 403         if( p_sys->p_dst_e )
 404             memset( p_sys->p_dst_e->p[0].p_pixels, 0, p_sys->p_dst_e->p[0].i_pitch * p_sys->p_dst_e->p[0].i_lines );
 405     }
 406
 407     if( !p_sys->ctx ||
 408         ( cfg.b_has_a && ( !p_sys->ctxA || !p_sys->p_src_a || !p_sys->p_dst_a ) ) ||
 409         ( p_sys->i_extend_factor != 1 && ( !p_sys->p_src_e || !p_sys->p_dst_e ) ) )
 410     {
 411         msg_Err( p_filter, "could not init SwScaler and/or allocate memory" );
 412         Clean( p_filter );
 413         return VLC_EGENERIC;
 414     }
 415
 416     p_sys->b_add_a = cfg.b_add_a;
 417     p_sys->b_copy = cfg.b_copy;
 418     p_sys->fmt_in  = *p_fmti;
 419     p_sys->fmt_out = *p_fmto;
 420     p_sys->b_swap_uvi = cfg.b_swap_uvi;
 421     p_sys->b_swap_uvo = cfg.b_swap_uvo;
 422
 423     video_format_ScaleCropAr( p_fmto, p_fmti );
 424 #if 0
 425     msg_Dbg( p_filter, "%ix%i chroma: %4.4s -> %ix%i chroma: %4.4s extend by %d",
 426              p_fmti->i_width, p_fmti->i_height, (char *)&p_fmti->i_chroma,
 427              p_fmto->i_width, p_fmto->i_height, (char *)&p_fmto->i_chroma,
 428              p_sys->i_extend_factor );
 429 #endif
 430     return VLC_SUCCESS;
 431 }
 432 static void Clean( filter_t *p_filter )
 433 {
 434     filter_sys_t *p_sys = p_filter->p_sys;
 435
 436     if( p_sys->p_src_e )
 437         picture_Release( p_sys->p_src_e );
 438     if( p_sys->p_dst_e )
 439         picture_Release( p_sys->p_dst_e );
 440
 441     if( p_sys->p_src_a )
 442         picture_Release( p_sys->p_src_a );
 443     if( p_sys->p_dst_a )
 444         picture_Release( p_sys->p_dst_a );
 445
 446     if( p_sys->ctxA )
 447         sws_freeContext( p_sys->ctxA );
 448
 449     if( p_sys->ctx )
 450         sws_freeContext( p_sys->ctx );
 451
 452     /* We have to set it to null has we call be called again :( */
 453     p_sys->ctx = NULL;
 454     p_sys->ctxA = NULL;
 455     p_sys->p_src_a = NULL;
 456     p_sys->p_dst_a = NULL;
 457     p_sys->p_src_e = NULL;
 458     p_sys->p_dst_e = NULL;
 459 }
 460
 461 static void GetPixels( uint8_t *pp_pixel[4], int pi_pitch[4],
 462                        const picture_t *p_picture,
 463                        int i_plane_start, int i_plane_count,
 464                        bool b_swap_uv )
 465 {
 466     assert( !b_swap_uv || i_plane_count >= 3 );
 467     int n;
 468     for( n = 0; n < __MIN(i_plane_count, p_picture->i_planes-i_plane_start ); n++ )
 469     {
 470         const int nd = ( b_swap_uv && n >= 1 && n <= 2 ) ? (3 - n) : n;
 471         pp_pixel[nd] = p_picture->p[i_plane_start+n].p_pixels;
 472         pi_pitch[nd] = p_picture->p[i_plane_start+n].i_pitch;
 473     }
 474     for( ; n < 4; n++ )
 475     {
 476         pp_pixel[n] = NULL;
 477         pi_pitch[n] = 0;
 478     }
 479 }
 480
 481 static void ExtractA( picture_t *p_dst, const picture_t *p_src, unsigned i_width, unsigned i_height )
 482 {
 483     plane_t *d = &p_dst->p[0];
 484     const plane_t *s = &p_src->p[0];
 485
 486     for( unsigned y = 0; y < i_height; y++ )
 487         for( unsigned x = 0; x < i_width; x++ )
 488             d->p_pixels[y*d->i_pitch+x] = s->p_pixels[y*s->i_pitch+4*x+OFFSET_A];
 489 }
 490 static void InjectA( picture_t *p_dst, const picture_t *p_src, unsigned i_width, unsigned i_height )
 491 {
 492     plane_t *d = &p_dst->p[0];
 493     const plane_t *s = &p_src->p[0];
 494
 495     for( unsigned y = 0; y < i_height; y++ )
 496         for( unsigned x = 0; x < i_width; x++ )
 497             d->p_pixels[y*d->i_pitch+4*x+OFFSET_A] = s->p_pixels[y*s->i_pitch+x];
 498 }
 499 static void FillA( plane_t *d, int i_offset )
 500 {
 501     for( int y = 0; y < d->i_visible_lines; y++ )
 502         for( int x = 0; x < d->i_visible_pitch; x += d->i_pixel_pitch )
 503             d->p_pixels[y*d->i_pitch+x+i_offset] = 0xff;
 504 }
 505
 506 static void CopyPad( picture_t *p_dst, const picture_t *p_src )
 507 {
 508     picture_Copy( p_dst, p_src );
 509     for( int n = 0; n < p_dst->i_planes; n++ )
 510     {
 511         const plane_t *s = &p_src->p[n];
 512         plane_t *d = &p_dst->p[n];
 513
 514         for( int y = 0; y < s->i_lines; y++ )
 515         {
 516             for( int x = s->i_visible_pitch; x < d->i_visible_pitch; x += s->i_pixel_pitch )
 517                 memcpy( &d->p_pixels[y*d->i_pitch + x], &d->p_pixels[y*d->i_pitch + s->i_visible_pitch - s->i_pixel_pitch], s->i_pixel_pitch );
 518         }
 519     }
 520 }
 521
 522 static void SwapUV( picture_t *p_dst, const picture_t *p_src )
 523 {
 524     picture_t tmp = *p_src;
 525     tmp.p[1] = p_src->p[2];
 526     tmp.p[2] = p_src->p[1];
 527
 528     picture_CopyPixels( p_dst, &tmp );
 529 }
 530 static void Convert( filter_t *p_filter, struct SwsContext *ctx,
 531                      picture_t *p_dst, picture_t *p_src, int i_height, int i_plane_start, int i_plane_count,
 532                      bool b_swap_uvi, bool b_swap_uvo )
 533 {
 534     uint8_t palette[AVPALETTE_SIZE];
 535
 536     uint8_t *src[4]; int src_stride[4];
 537     uint8_t *dst[4]; int dst_stride[4];
 538
 539     GetPixels( src, src_stride, p_src, i_plane_start, i_plane_count, b_swap_uvi );
 540     if( p_filter->fmt_in.video.i_chroma == VLC_CODEC_RGBP )
 541     {
 542         memset( palette, 0, sizeof(palette) );
 543         if( p_filter->fmt_in.video.p_palette )
 544             memcpy( palette, p_filter->fmt_in.video.p_palette->palette,
 545                     __MIN( sizeof(video_palette_t), AVPALETTE_SIZE ) );
 546         src[1] = palette;
 547         src_stride[1] = 4;
 548     }
 549
 550     GetPixels( dst, dst_stride, p_dst, i_plane_start, i_plane_count, b_swap_uvo );
 551
 552 #if LIBSWSCALE_VERSION_INT  >= ((0<<16)+(5<<8)+0)
 553     sws_scale( ctx, src, src_stride, 0, i_height,
 554                dst, dst_stride );
 555 #else
 556     sws_scale_ordered( ctx, src, src_stride, 0, i_height,
 557                        dst, dst_stride );
 558 #endif
 559 }
 560
 561 /****************************************************************************
 562  * Filter: the whole thing
 563  ****************************************************************************
 564  * This function is called just after the thread is launched.
 565  ****************************************************************************/
 566 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 567 {
 568     filter_sys_t *p_sys = p_filter->p_sys;
 569     const video_format_t *p_fmti = &p_filter->fmt_in.video;
 570     const video_format_t *p_fmto = &p_filter->fmt_out.video;
 571     picture_t *p_pic_dst;
 572
 573     /* Check if format properties changed */
 574     if( Init( p_filter ) )
 575     {
 576         picture_Release( p_pic );
 577         return NULL;
 578     }
 579
 580     /* Request output picture */
 581     p_pic_dst = filter_NewPicture( p_filter );
 582     if( !p_pic_dst )
 583     {
 584         picture_Release( p_pic );
 585         return NULL;
 586     }
 587
 588     /* */
 589     picture_t *p_src = p_pic;
 590     picture_t *p_dst = p_pic_dst;
 591     if( p_sys->i_extend_factor != 1 )
 592     {
 593         p_src = p_sys->p_src_e;
 594         p_dst = p_sys->p_dst_e;
 595
 596         CopyPad( p_src, p_pic );
 597     }
 598
 599     if( p_sys->b_copy && p_sys->b_swap_uvi == p_sys->b_swap_uvo )
 600         picture_CopyPixels( p_dst, p_src );
 601     else if( p_sys->b_copy )
 602         SwapUV( p_dst, p_src );
 603     else
 604         Convert( p_filter, p_sys->ctx, p_dst, p_src, p_fmti->i_height, 0, 3,
 605                  p_sys->b_swap_uvi, p_sys->b_swap_uvo );
 606     if( p_sys->ctxA )
 607     {
 608         /* We extract the A plane to rescale it, and then we reinject it. */
 609         if( p_fmti->i_chroma == VLC_CODEC_RGBA )
 610             ExtractA( p_sys->p_src_a, p_src, p_fmti->i_width * p_sys->i_extend_factor, p_fmti->i_height );
 611         else
 612             plane_CopyPixels( p_sys->p_src_a->p, p_src->p+A_PLANE );
 613
 614         Convert( p_filter, p_sys->ctxA, p_sys->p_dst_a, p_sys->p_src_a, p_fmti->i_height, 0, 1, false, false );
 615         if( p_fmto->i_chroma == VLC_CODEC_RGBA )
 616             InjectA( p_dst, p_sys->p_dst_a, p_fmto->i_width * p_sys->i_extend_factor, p_fmto->i_height );
 617         else
 618             plane_CopyPixels( p_dst->p+A_PLANE, p_sys->p_dst_a->p );
 619     }
 620     else if( p_sys->b_add_a )
 621     {
 622         /* We inject a complete opaque alpha plane */
 623         if( p_fmto->i_chroma == VLC_CODEC_RGBA )
 624             FillA( &p_dst->p[0], OFFSET_A );
 625         else
 626             FillA( &p_dst->p[A_PLANE], 0 );
 627     }
 628
 629     if( p_sys->i_extend_factor != 1 )
 630     {
 631         picture_CopyPixels( p_pic_dst, p_dst );
 632     }
 633
 634     picture_CopyProperties( p_pic_dst, p_pic );
 635     picture_Release( p_pic );
 636     return p_pic_dst;
 637 }
 638
 639 #else /* LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0) */
 640
 641 int OpenScaler( vlc_object_t *p_this )
 642 {
 643     return VLC_EGENERIC;
 644 }
 645
 646 void CloseScaler( vlc_object_t *p_this )
 647 {
 648 }
 649
 650 #endif /* LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0) */