modules/video_chroma/swscale.c

   1 /*****************************************************************************
   2  * swscale.c: scaling and chroma conversion using libswscale
   3  *****************************************************************************
   4  * Copyright (C) 1999-2008 VLC authors and VideoLAN
   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 it
  11  * under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with this program; if not, write to the Free Software Foundation,
  22  * 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_picture.h>
  37 #include <vlc_cpu.h>
  38
  39 #include <libswscale/swscale.h>
  40 #include <libswscale/version.h>
  41
  42 #ifdef __APPLE__
  43 # include <TargetConditionals.h>
  44 #endif
  45
  46 #include "../codec/avcodec/chroma.h" // Chroma Avutil <-> VLC conversion
  47
  48 /* Gruikkkkkkkkkk!!!!! */
  49 #undef AVPALETTE_SIZE
  50 #define AVPALETTE_SIZE (256 * sizeof(uint32_t))
  51
  52 /*****************************************************************************
  53  * Module descriptor
  54  *****************************************************************************/
  55 static int  OpenScaler( vlc_object_t * );
  56 static void CloseScaler( vlc_object_t * );
  57
  58 #define SCALEMODE_TEXT N_("Scaling mode")
  59 #define SCALEMODE_LONGTEXT N_("Scaling mode to use.")
  60
  61 static const int pi_mode_values[] = { 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 };
  62 const char *const ppsz_mode_descriptions[] =
  63 { N_("Fast bilinear"), N_("Bilinear"), N_("Bicubic (good quality)"),
  64   N_("Experimental"), N_("Nearest neighbour (bad quality)"),
  65   N_("Area"), N_("Luma bicubic / chroma bilinear"), N_("Gauss"),
  66   N_("SincR"), N_("Lanczos"), N_("Bicubic spline") };
  67
  68 vlc_module_begin ()
  69     set_description( N_("Video scaling filter") )
  70     set_shortname( N_("Swscale" ) )
  71     set_capability( "video converter", 150 )
  72     set_category( CAT_VIDEO )
  73     set_subcategory( SUBCAT_VIDEO_VFILTER )
  74     set_callbacks( OpenScaler, CloseScaler )
  75     add_integer( "swscale-mode", 2, SCALEMODE_TEXT, SCALEMODE_LONGTEXT, true )
  76         change_integer_list( pi_mode_values, ppsz_mode_descriptions )
  77 vlc_module_end ()
  78
  79 /* Version checking */
  80 #if LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0)
  81 /****************************************************************************
  82  * Local prototypes
  83  ****************************************************************************/
  84
  85 /**
  86  * Internal swscale filter structure.
  87  */
  88 typedef struct
  89 {
  90     SwsFilter *p_filter;
  91     int i_cpu_mask, i_sws_flags;
  92
  93     video_format_t fmt_in;
  94     video_format_t fmt_out;
  95     const vlc_chroma_description_t *desc_in;
  96     const vlc_chroma_description_t *desc_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     bool b_swap_uvi;
 108     bool b_swap_uvo;
 109 } filter_sys_t;
 110
 111 static picture_t *Filter( filter_t *, picture_t * );
 112 static int  Init( filter_t * );
 113 static void Clean( filter_t * );
 114
 115 typedef struct
 116 {
 117     int  i_fmti;
 118     int  i_fmto;
 119     bool b_has_a;
 120     bool b_add_a;
 121     int  i_sws_flags;
 122     bool b_copy;
 123     bool b_swap_uvi;
 124     bool b_swap_uvo;
 125 } ScalerConfiguration;
 126
 127 static int GetParameters( ScalerConfiguration *,
 128                           const video_format_t *p_fmti,
 129                           const video_format_t *p_fmto,
 130                           int i_sws_flags_default );
 131
 132 static int GetSwsCpuMask(void);
 133
 134 /* SwScaler point resize quality seems really bad, let our scale module do it
 135  * (change it to true to try) */
 136 #define ALLOW_YUVP (false)
 137 /* SwScaler does not like too small picture */
 138 #define MINIMUM_WIDTH (32)
 139
 140 /* XXX is it always 3 even for BIG_ENDIAN (blend.c seems to think so) ? */
 141 #define OFFSET_A (3)
 142
 143 /*****************************************************************************
 144  * OpenScaler: probe the filter and return score
 145  *****************************************************************************/
 146 static int OpenScaler( vlc_object_t *p_this )
 147 {
 148     filter_t *p_filter = (filter_t*)p_this;
 149     filter_sys_t *p_sys;
 150
 151     int i_sws_mode;
 152
 153     if( GetParameters( NULL,
 154                        &p_filter->fmt_in.video,
 155                        &p_filter->fmt_out.video, 0 ) )
 156         return VLC_EGENERIC;
 157
 158     /* Allocate the memory needed to store the decoder's structure */
 159     if( ( p_filter->p_sys = p_sys = calloc(1, sizeof(filter_sys_t)) ) == NULL )
 160         return VLC_ENOMEM;
 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     /* Misc init */
 184     memset( &p_sys->fmt_in,  0, sizeof(p_sys->fmt_in) );
 185     memset( &p_sys->fmt_out, 0, sizeof(p_sys->fmt_out) );
 186
 187     if( Init( p_filter ) )
 188     {
 189         if( p_sys->p_filter )
 190             sws_freeFilter( p_sys->p_filter );
 191         free( p_sys );
 192         return VLC_EGENERIC;
 193     }
 194
 195     /* */
 196     p_filter->pf_video_filter = Filter;
 197
 198     msg_Dbg( p_filter, "%ix%i (%ix%i) chroma: %4.4s -> %ix%i (%ix%i) chroma: %4.4s with scaling using %s",
 199              p_filter->fmt_in.video.i_visible_width, p_filter->fmt_in.video.i_visible_height,
 200              p_filter->fmt_in.video.i_width, p_filter->fmt_in.video.i_height,
 201              (char *)&p_filter->fmt_in.video.i_chroma,
 202              p_filter->fmt_out.video.i_visible_width, p_filter->fmt_out.video.i_visible_height,
 203              p_filter->fmt_out.video.i_width, p_filter->fmt_out.video.i_height,
 204              (char *)&p_filter->fmt_out.video.i_chroma,
 205              ppsz_mode_descriptions[i_sws_mode] );
 206
 207     return VLC_SUCCESS;
 208 }
 209
 210 /*****************************************************************************
 211  * CloseFilter: clean up the filter
 212  *****************************************************************************/
 213 static void CloseScaler( vlc_object_t *p_this )
 214 {
 215     filter_t *p_filter = (filter_t*)p_this;
 216     filter_sys_t *p_sys = p_filter->p_sys;
 217
 218     Clean( p_filter );
 219     if( p_sys->p_filter )
 220         sws_freeFilter( p_sys->p_filter );
 221     free( p_sys );
 222 }
 223
 224 /*****************************************************************************
 225  * Helpers
 226  *****************************************************************************/
 227 static int GetSwsCpuMask(void)
 228 {
 229     int i_sws_cpu = 0;
 230
 231 #if LIBSWSCALE_VERSION_MAJOR < 4
 232 #if defined(__i386__) || defined(__x86_64__)
 233     if( vlc_CPU_MMX() )
 234         i_sws_cpu |= SWS_CPU_CAPS_MMX;
 235 #if (LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0))
 236     if( vlc_CPU_MMXEXT() )
 237         i_sws_cpu |= SWS_CPU_CAPS_MMX2;
 238 #endif
 239     if( vlc_CPU_3dNOW() )
 240         i_sws_cpu |= SWS_CPU_CAPS_3DNOW;
 241 #elif defined(__ppc__) || defined(__ppc64__) || defined(__powerpc__)
 242     if( vlc_CPU_ALTIVEC() )
 243         i_sws_cpu |= SWS_CPU_CAPS_ALTIVEC;
 244 #endif
 245 #endif
 246
 247     return i_sws_cpu;
 248 }
 249
 250 static void FixParameters( int *pi_fmt, bool *pb_has_a, bool *pb_swap_uv, vlc_fourcc_t fmt )
 251 {
 252     switch( fmt )
 253     {
 254     case VLC_CODEC_YUV422A:
 255         *pi_fmt = AV_PIX_FMT_YUV422P;
 256         *pb_has_a = true;
 257         break;
 258     case VLC_CODEC_YUV420A:
 259         *pi_fmt = AV_PIX_FMT_YUV420P;
 260         *pb_has_a = true;
 261         break;
 262     case VLC_CODEC_YUVA:
 263         *pi_fmt = AV_PIX_FMT_YUV444P;
 264         *pb_has_a = true;
 265         break;
 266     case VLC_CODEC_RGBA:
 267         *pi_fmt = AV_PIX_FMT_BGR32;
 268         *pb_has_a = true;
 269         break;
 270     case VLC_CODEC_ARGB:
 271         *pi_fmt = AV_PIX_FMT_BGR32_1;
 272         *pb_has_a = true;
 273         break;
 274     case VLC_CODEC_BGRA:
 275         *pi_fmt = AV_PIX_FMT_RGB32;
 276         *pb_has_a = true;
 277         break;
 278     case VLC_CODEC_YV12:
 279         *pi_fmt = AV_PIX_FMT_YUV420P;
 280         *pb_swap_uv = true;
 281         break;
 282     case VLC_CODEC_YV9:
 283         *pi_fmt = AV_PIX_FMT_YUV410P;
 284         *pb_swap_uv = true;
 285         break;
 286     default:
 287         break;
 288     }
 289 }
 290
 291 static int GetParameters( ScalerConfiguration *p_cfg,
 292                           const video_format_t *p_fmti,
 293                           const video_format_t *p_fmto,
 294                           int i_sws_flags_default )
 295 {
 296     int i_fmti = -1;
 297     int i_fmto = -1;
 298
 299     bool b_has_ai = false;
 300     bool b_has_ao = false;
 301     int i_sws_flags = i_sws_flags_default;
 302     bool b_swap_uvi = false;
 303     bool b_swap_uvo = false;
 304
 305     GetFfmpegChroma( &i_fmti, p_fmti );
 306     GetFfmpegChroma( &i_fmto, p_fmto );
 307
 308     if( p_fmti->i_chroma == p_fmto->i_chroma )
 309     {
 310         if( p_fmti->i_chroma == VLC_CODEC_YUVP && ALLOW_YUVP )
 311         {
 312             i_fmti = i_fmto = AV_PIX_FMT_GRAY8;
 313             i_sws_flags = SWS_POINT;
 314         }
 315     }
 316
 317     FixParameters( &i_fmti, &b_has_ai, &b_swap_uvi, p_fmti->i_chroma );
 318     FixParameters( &i_fmto, &b_has_ao, &b_swap_uvo, p_fmto->i_chroma );
 319
 320 #if !defined (__ANDROID__) && !defined(TARGET_OS_IPHONE)
 321     /* FIXME TODO removed when ffmpeg is fixed
 322      * Without SWS_ACCURATE_RND the quality is really bad for some conversions */
 323     switch( i_fmto )
 324     {
 325     case AV_PIX_FMT_ARGB:
 326     case AV_PIX_FMT_RGBA:
 327     case AV_PIX_FMT_ABGR:
 328         i_sws_flags |= SWS_ACCURATE_RND;
 329         break;
 330     }
 331 #endif
 332
 333     if( p_cfg )
 334     {
 335         p_cfg->i_fmti = i_fmti;
 336         p_cfg->i_fmto = i_fmto;
 337         p_cfg->b_has_a = b_has_ai && b_has_ao;
 338         p_cfg->b_add_a = (!b_has_ai) && b_has_ao;
 339         p_cfg->b_copy = i_fmti == i_fmto &&
 340                         p_fmti->i_visible_width == p_fmto->i_visible_width &&
 341                         p_fmti->i_visible_height == p_fmto->i_visible_height;
 342         p_cfg->b_swap_uvi = b_swap_uvi;
 343         p_cfg->b_swap_uvo = b_swap_uvo;
 344         p_cfg->i_sws_flags = i_sws_flags;
 345     }
 346
 347     if( i_fmti < 0 || i_fmto < 0 )
 348         return VLC_EGENERIC;
 349
 350     return VLC_SUCCESS;
 351 }
 352
 353 static int Init( filter_t *p_filter )
 354 {
 355     filter_sys_t *p_sys = p_filter->p_sys;
 356     const video_format_t *p_fmti = &p_filter->fmt_in.video;
 357     video_format_t       *p_fmto = &p_filter->fmt_out.video;
 358
 359     if( p_fmti->orientation != p_fmto->orientation )
 360         return VLC_EGENERIC;
 361
 362     if( video_format_IsSimilar( p_fmti, &p_sys->fmt_in ) &&
 363         video_format_IsSimilar( p_fmto, &p_sys->fmt_out ) &&
 364         p_sys->ctx )
 365     {
 366         return VLC_SUCCESS;
 367     }
 368
 369     Clean( p_filter );
 370
 371     /* Init with new parameters */
 372     ScalerConfiguration cfg;
 373     if( GetParameters( &cfg, p_fmti, p_fmto, p_sys->i_sws_flags ) )
 374     {
 375         msg_Err( p_filter, "format not supported" );
 376         return VLC_EGENERIC;
 377     }
 378     if( p_fmti->i_visible_width == 0 || p_fmti->i_visible_height == 0 ||
 379         p_fmto->i_visible_width == 0 || p_fmto->i_visible_height == 0 )
 380     {
 381         msg_Err( p_filter, "invalid scaling: %ix%i -> %ix%i",
 382                  p_fmti->i_visible_width, p_fmti->i_visible_height,
 383                  p_fmto->i_visible_width, p_fmto->i_visible_height);
 384         return VLC_EGENERIC;
 385     }
 386
 387     p_sys->desc_in = vlc_fourcc_GetChromaDescription( p_fmti->i_chroma );
 388     p_sys->desc_out = vlc_fourcc_GetChromaDescription( p_fmto->i_chroma );
 389     if( p_sys->desc_in == NULL || p_sys->desc_out == NULL )
 390         return VLC_EGENERIC;
 391
 392     /* swscale does not like too small width */
 393     p_sys->i_extend_factor = 1;
 394     while( __MIN( p_fmti->i_visible_width, p_fmto->i_visible_width ) * p_sys->i_extend_factor < MINIMUM_WIDTH)
 395         p_sys->i_extend_factor++;
 396
 397     const unsigned i_fmti_visible_width = p_fmti->i_visible_width * p_sys->i_extend_factor;
 398     const unsigned i_fmto_visible_width = p_fmto->i_visible_width * p_sys->i_extend_factor;
 399     for( int n = 0; n < (cfg.b_has_a ? 2 : 1); n++ )
 400     {
 401         const int i_fmti = n == 0 ? cfg.i_fmti : AV_PIX_FMT_GRAY8;
 402         const int i_fmto = n == 0 ? cfg.i_fmto : AV_PIX_FMT_GRAY8;
 403         struct SwsContext *ctx;
 404
 405         ctx = sws_getContext( i_fmti_visible_width, p_fmti->i_visible_height, i_fmti,
 406                               i_fmto_visible_width, p_fmto->i_visible_height, i_fmto,
 407                               cfg.i_sws_flags | p_sys->i_cpu_mask,
 408                               p_sys->p_filter, NULL, 0 );
 409         if( n == 0 )
 410             p_sys->ctx = ctx;
 411         else
 412             p_sys->ctxA = ctx;
 413     }
 414     if( p_sys->ctxA )
 415     {
 416         p_sys->p_src_a = picture_New( VLC_CODEC_GREY, i_fmti_visible_width, p_fmti->i_visible_height, 0, 1 );
 417         p_sys->p_dst_a = picture_New( VLC_CODEC_GREY, i_fmto_visible_width, p_fmto->i_visible_height, 0, 1 );
 418     }
 419     if( p_sys->i_extend_factor != 1 )
 420     {
 421         p_sys->p_src_e = picture_New( p_fmti->i_chroma, i_fmti_visible_width, p_fmti->i_visible_height, 0, 1 );
 422         p_sys->p_dst_e = picture_New( p_fmto->i_chroma, i_fmto_visible_width, p_fmto->i_visible_height, 0, 1 );
 423
 424         if( p_sys->p_src_e )
 425             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 );
 426         if( p_sys->p_dst_e )
 427             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 );
 428     }
 429
 430     if( !p_sys->ctx ||
 431         ( cfg.b_has_a && ( !p_sys->ctxA || !p_sys->p_src_a || !p_sys->p_dst_a ) ) ||
 432         ( p_sys->i_extend_factor != 1 && ( !p_sys->p_src_e || !p_sys->p_dst_e ) ) )
 433     {
 434         msg_Err( p_filter, "could not init SwScaler and/or allocate memory" );
 435         Clean( p_filter );
 436         return VLC_EGENERIC;
 437     }
 438
 439     if (p_filter->b_allow_fmt_out_change)
 440     {
 441         /*
 442          * If the transformation is not homothetic we must modify the
 443          * aspect ratio of the output format in order to have the
 444          * output picture displayed correctly and not stretched
 445          * horizontally or vertically.
 446          * WARNING: this is a hack, ideally this should not be needed
 447          * and the vout should update its video format instead.
 448          */
 449         unsigned i_sar_num = p_fmti->i_sar_num * p_fmti->i_visible_width;
 450         unsigned i_sar_den = p_fmti->i_sar_den * p_fmto->i_visible_width;
 451         vlc_ureduce(&i_sar_num, &i_sar_den, i_sar_num, i_sar_den, 65536);
 452         i_sar_num *= p_fmto->i_visible_height;
 453         i_sar_den *= p_fmti->i_visible_height;
 454         vlc_ureduce(&i_sar_num, &i_sar_den, i_sar_num, i_sar_den, 65536);
 455         p_fmto->i_sar_num = i_sar_num;
 456         p_fmto->i_sar_den = i_sar_den;
 457     }
 458
 459     p_sys->b_add_a = cfg.b_add_a;
 460     p_sys->b_copy = cfg.b_copy;
 461     p_sys->fmt_in  = *p_fmti;
 462     p_sys->fmt_out = *p_fmto;
 463     p_sys->b_swap_uvi = cfg.b_swap_uvi;
 464     p_sys->b_swap_uvo = cfg.b_swap_uvo;
 465
 466     return VLC_SUCCESS;
 467 }
 468
 469 static void Clean( filter_t *p_filter )
 470 {
 471     filter_sys_t *p_sys = p_filter->p_sys;
 472
 473     if( p_sys->p_src_e )
 474         picture_Release( p_sys->p_src_e );
 475     if( p_sys->p_dst_e )
 476         picture_Release( p_sys->p_dst_e );
 477
 478     if( p_sys->p_src_a )
 479         picture_Release( p_sys->p_src_a );
 480     if( p_sys->p_dst_a )
 481         picture_Release( p_sys->p_dst_a );
 482
 483     if( p_sys->ctxA )
 484         sws_freeContext( p_sys->ctxA );
 485
 486     if( p_sys->ctx )
 487         sws_freeContext( p_sys->ctx );
 488
 489     /* We have to set it to null has we call be called again :( */
 490     p_sys->ctx = NULL;
 491     p_sys->ctxA = NULL;
 492     p_sys->p_src_a = NULL;
 493     p_sys->p_dst_a = NULL;
 494     p_sys->p_src_e = NULL;
 495     p_sys->p_dst_e = NULL;
 496 }
 497
 498 static void GetPixels( uint8_t *pp_pixel[4], int pi_pitch[4],
 499                        const vlc_chroma_description_t *desc,
 500                        const video_format_t *fmt,
 501                        const picture_t *p_picture, unsigned planes,
 502                        bool b_swap_uv )
 503 {
 504     unsigned i = 0;
 505
 506     if( planes > (unsigned)p_picture->i_planes )
 507         planes = p_picture->i_planes;
 508     assert( !b_swap_uv || planes >= 3 );
 509
 510     for( ; i < planes; i++ )
 511     {
 512         const plane_t *p = p_picture->p + i;
 513         if( b_swap_uv && (i == 1 || i== 2) )
 514             p = p_picture->p + 3 - i;
 515
 516         pp_pixel[i] = p->p_pixels
 517             + (((fmt->i_x_offset * desc->p[i].w.num) / desc->p[i].w.den)
 518                 * p->i_pixel_pitch)
 519             + (((fmt->i_y_offset * desc->p[i].h.num) / desc->p[i].h.den)
 520                 * p->i_pitch);
 521         pi_pitch[i] = p->i_pitch;
 522     }
 523
 524     for( ; i < 4; i++ )
 525     {
 526         pp_pixel[i] = NULL;
 527         pi_pitch[i] = 0;
 528     }
 529 }
 530
 531 static void ExtractA( picture_t *p_dst, const picture_t *restrict p_src,
 532                       unsigned offset )
 533 {
 534     plane_t *d = &p_dst->p[0];
 535     const plane_t *s = &p_src->p[0];
 536
 537     for( unsigned y = 0; y < p_dst->format.i_height; y++ )
 538         for( unsigned x = 0; x < p_dst->format.i_width; x++ )
 539             d->p_pixels[y*d->i_pitch+x] = s->p_pixels[y*s->i_pitch+4*x+offset];
 540 }
 541
 542 static void InjectA( picture_t *p_dst, const picture_t *restrict p_src,
 543                      unsigned offset )
 544 {
 545     plane_t *d = &p_dst->p[0];
 546     const plane_t *s = &p_src->p[0];
 547
 548     for( unsigned y = 0; y < p_src->format.i_height; y++ )
 549         for( unsigned x = 0; x < p_src->format.i_width; x++ )
 550             d->p_pixels[y*d->i_pitch+4*x+offset] = s->p_pixels[y*s->i_pitch+x];
 551 }
 552
 553 static void FillA( plane_t *d, unsigned i_offset )
 554 {
 555     for( int y = 0; y < d->i_visible_lines; y++ )
 556         for( int x = 0; x < d->i_visible_pitch; x += d->i_pixel_pitch )
 557             d->p_pixels[y*d->i_pitch+x+i_offset] = 0xff;
 558 }
 559
 560 static void CopyPad( picture_t *p_dst, const picture_t *p_src )
 561 {
 562     picture_Copy( p_dst, p_src );
 563     for( int n = 0; n < p_dst->i_planes; n++ )
 564     {
 565         const plane_t *s = &p_src->p[n];
 566         plane_t *d = &p_dst->p[n];
 567
 568         for( int y = 0; y < s->i_lines && y < d->i_lines; y++ )
 569         {
 570             for( int x = s->i_visible_pitch; x < d->i_visible_pitch; x += s->i_pixel_pitch )
 571                 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 );
 572         }
 573     }
 574 }
 575
 576 static void SwapUV( picture_t *p_dst, const picture_t *p_src )
 577 {
 578     picture_t tmp = *p_src;
 579     tmp.p[1] = p_src->p[2];
 580     tmp.p[2] = p_src->p[1];
 581
 582     picture_CopyPixels( p_dst, &tmp );
 583 }
 584
 585 static void Convert( filter_t *p_filter, struct SwsContext *ctx,
 586                      picture_t *p_dst, picture_t *p_src, int i_height,
 587                      int i_plane_count, bool b_swap_uvi, bool b_swap_uvo )
 588 {
 589     filter_sys_t *p_sys = p_filter->p_sys;
 590     uint8_t palette[AVPALETTE_SIZE];
 591     uint8_t *src[4]; int src_stride[4];
 592     uint8_t *dst[4]; int dst_stride[4];
 593
 594     GetPixels( src, src_stride, p_sys->desc_in, &p_filter->fmt_in.video,
 595                p_src, i_plane_count, b_swap_uvi );
 596     if( p_filter->fmt_in.video.i_chroma == VLC_CODEC_RGBP )
 597     {
 598         memset( palette, 0, sizeof(palette) );
 599         if( p_filter->fmt_in.video.p_palette )
 600             memcpy( palette, p_filter->fmt_in.video.p_palette->palette,
 601                     __MIN( sizeof(video_palette_t), AVPALETTE_SIZE ) );
 602         src[1] = palette;
 603         src_stride[1] = 4;
 604     }
 605
 606     GetPixels( dst, dst_stride, p_sys->desc_out, &p_filter->fmt_out.video,
 607                p_dst, i_plane_count, b_swap_uvo );
 608
 609 #if LIBSWSCALE_VERSION_INT  >= ((0<<16)+(5<<8)+0)
 610     sws_scale( ctx, src, src_stride, 0, i_height,
 611                dst, dst_stride );
 612 #else
 613     sws_scale_ordered( ctx, src, src_stride, 0, i_height,
 614                        dst, dst_stride );
 615 #endif
 616 }
 617
 618 /****************************************************************************
 619  * Filter: the whole thing
 620  ****************************************************************************
 621  * This function is called just after the thread is launched.
 622  ****************************************************************************/
 623 static picture_t *Filter( filter_t *p_filter, picture_t *p_pic )
 624 {
 625     filter_sys_t *p_sys = p_filter->p_sys;
 626     const video_format_t *p_fmti = &p_filter->fmt_in.video;
 627     const video_format_t *p_fmto = &p_filter->fmt_out.video;
 628     picture_t *p_pic_dst;
 629
 630     /* Check if format properties changed */
 631     if( Init( p_filter ) )
 632     {
 633         picture_Release( p_pic );
 634         return NULL;
 635     }
 636
 637     /* Request output picture */
 638     p_pic_dst = filter_NewPicture( p_filter );
 639     if( !p_pic_dst )
 640     {
 641         picture_Release( p_pic );
 642         return NULL;
 643     }
 644
 645     /* */
 646     picture_t *p_src = p_pic;
 647     picture_t *p_dst = p_pic_dst;
 648     if( p_sys->i_extend_factor != 1 )
 649     {
 650         p_src = p_sys->p_src_e;
 651         p_dst = p_sys->p_dst_e;
 652
 653         CopyPad( p_src, p_pic );
 654     }
 655
 656     if( p_sys->b_copy && p_sys->b_swap_uvi == p_sys->b_swap_uvo )
 657         picture_CopyPixels( p_dst, p_src );
 658     else if( p_sys->b_copy )
 659         SwapUV( p_dst, p_src );
 660     else
 661     {
 662         /* Even if alpha is unused, swscale expects the pointer to be set */
 663         const int n_planes = !p_sys->ctxA && (p_src->i_planes == 4 ||
 664                              p_dst->i_planes == 4) ? 4 : 3;
 665         Convert( p_filter, p_sys->ctx, p_dst, p_src, p_fmti->i_visible_height,
 666                  n_planes, p_sys->b_swap_uvi, p_sys->b_swap_uvo );
 667     }
 668     if( p_sys->ctxA )
 669     {
 670         /* We extract the A plane to rescale it, and then we reinject it. */
 671         if( p_fmti->i_chroma == VLC_CODEC_RGBA || p_fmti->i_chroma == VLC_CODEC_BGRA )
 672             ExtractA( p_sys->p_src_a, p_src, OFFSET_A );
 673         else if( p_fmti->i_chroma == VLC_CODEC_ARGB )
 674             ExtractA( p_sys->p_src_a, p_src, 0 );
 675         else
 676             plane_CopyPixels( p_sys->p_src_a->p, p_src->p+A_PLANE );
 677
 678         Convert( p_filter, p_sys->ctxA, p_sys->p_dst_a, p_sys->p_src_a,
 679                  p_fmti->i_visible_height, 1, false, false );
 680         if( p_fmto->i_chroma == VLC_CODEC_RGBA || p_fmto->i_chroma == VLC_CODEC_BGRA )
 681             InjectA( p_dst, p_sys->p_dst_a, OFFSET_A );
 682         else if( p_fmto->i_chroma == VLC_CODEC_ARGB )
 683             InjectA( p_dst, p_sys->p_dst_a, 0 );
 684         else
 685             plane_CopyPixels( p_dst->p+A_PLANE, p_sys->p_dst_a->p );
 686     }
 687     else if( p_sys->b_add_a )
 688     {
 689         /* We inject a complete opaque alpha plane */
 690         if( p_fmto->i_chroma == VLC_CODEC_RGBA || p_fmto->i_chroma == VLC_CODEC_BGRA )
 691             FillA( &p_dst->p[0], OFFSET_A );
 692         else if( p_fmto->i_chroma == VLC_CODEC_ARGB )
 693             FillA( &p_dst->p[0], 0 );
 694         else
 695             FillA( &p_dst->p[A_PLANE], 0 );
 696     }
 697
 698     if( p_sys->i_extend_factor != 1 )
 699     {
 700         picture_CopyPixels( p_pic_dst, p_dst );
 701     }
 702
 703     picture_CopyProperties( p_pic_dst, p_pic );
 704     picture_Release( p_pic );
 705     return p_pic_dst;
 706 }
 707
 708 #else /* LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0) */
 709
 710 int OpenScaler( vlc_object_t *p_this )
 711 {
 712     return VLC_EGENERIC;
 713 }
 714
 715 void CloseScaler( vlc_object_t *p_this )
 716 {
 717 }
 718
 719 #endif /* LIBSWSCALE_VERSION_INT >= ((0<<16)+(5<<8)+0) */