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