libmpcodecs/vf_scale.c

   1 #include <stdio.h>
   2 #include <stdlib.h>
   3 #include <string.h>
   4 #include <inttypes.h>
   5
   6 #include "config.h"
   7 #include "mp_msg.h"
   8 #include "cpudetect.h"
   9
  10 #include "img_format.h"
  11 #include "mp_image.h"
  12 #include "vf.h"
  13 #include "fmt-conversion.h"
  14
  15 #include "libvo/fastmemcpy.h"
  16 #include "libswscale/swscale.h"
  17 #include "vf_scale.h"
  18
  19 #include "m_option.h"
  20 #include "m_struct.h"
  21
  22 static struct vf_priv_s {
  23     int w,h;
  24     int v_chr_drop;
  25     double param[2];
  26     unsigned int fmt;
  27     struct SwsContext *ctx;
  28     struct SwsContext *ctx2; //for interlaced slices only
  29     unsigned char* palette;
  30     int interlaced;
  31     int noup;
  32     int accurate_rnd;
  33     int query_format_cache[64];
  34 } const vf_priv_dflt = {
  35   -1,-1,
  36   0,
  37   {SWS_PARAM_DEFAULT, SWS_PARAM_DEFAULT},
  38   0,
  39   NULL,
  40   NULL,
  41   NULL
  42 };
  43
  44 extern int opt_screen_size_x;
  45 extern int opt_screen_size_y;
  46 extern float screen_size_xy;
  47
  48 //===========================================================================//
  49
  50 void sws_getFlagsAndFilterFromCmdLine(int *flags, SwsFilter **srcFilterParam, SwsFilter **dstFilterParam);
  51
  52 static unsigned int outfmt_list[]={
  53 // YUV:
  54     IMGFMT_444P,
  55     IMGFMT_422P,
  56     IMGFMT_YV12,
  57     IMGFMT_I420,
  58     IMGFMT_IYUV,
  59     IMGFMT_YVU9,
  60     IMGFMT_IF09,
  61     IMGFMT_411P,
  62     IMGFMT_NV12,
  63     IMGFMT_NV21,
  64     IMGFMT_YUY2,
  65     IMGFMT_UYVY,
  66 // RGB and grayscale (Y8 and Y800):
  67     IMGFMT_BGR32,
  68     IMGFMT_RGB32,
  69     IMGFMT_BGR24,
  70     IMGFMT_RGB24,
  71     IMGFMT_BGR16,
  72     IMGFMT_RGB16,
  73     IMGFMT_BGR15,
  74     IMGFMT_RGB15,
  75     IMGFMT_Y800,
  76     IMGFMT_Y8,
  77     IMGFMT_BGR8,
  78     IMGFMT_RGB8,
  79     IMGFMT_BGR4,
  80     IMGFMT_RGB4,
  81     IMGFMT_BG4B,
  82     IMGFMT_RG4B,
  83     IMGFMT_BGR1,
  84     IMGFMT_RGB1,
  85     0
  86 };
  87
  88 static unsigned int find_best_out(vf_instance_t *vf){
  89     unsigned int best=0;
  90     int i;
  91
  92     // find the best outfmt:
  93     for(i=0; i<sizeof(outfmt_list)/sizeof(int)-1; i++){
  94         const int format= outfmt_list[i];
  95         int ret= vf->priv->query_format_cache[i]-1;
  96         if(ret == -1){
  97             ret= vf_next_query_format(vf, outfmt_list[i]);
  98             vf->priv->query_format_cache[i]= ret+1;
  99         }
 100
 101         mp_msg(MSGT_VFILTER,MSGL_DBG2,"scale: query(%s) -> %d\n",vo_format_name(format),ret&3);
 102         if(ret&VFCAP_CSP_SUPPORTED_BY_HW){
 103             best=format; // no conversion -> bingo!
 104             break;
 105         }
 106         if(ret&VFCAP_CSP_SUPPORTED && !best)
 107             best=format; // best with conversion
 108     }
 109     return best;
 110 }
 111
 112 static int config(struct vf_instance_s* vf,
 113         int width, int height, int d_width, int d_height,
 114         unsigned int flags, unsigned int outfmt){
 115     unsigned int best=find_best_out(vf);
 116     int vo_flags;
 117     int int_sws_flags=0;
 118     int round_w=0, round_h=0;
 119     SwsFilter *srcFilter, *dstFilter;
 120     enum PixelFormat dfmt, sfmt;
 121
 122     if(!best){
 123         mp_msg(MSGT_VFILTER,MSGL_WARN,"SwScale: no supported outfmt found :(\n");
 124         return 0;
 125     }
 126     sfmt = imgfmt2pixfmt(outfmt);
 127     dfmt = imgfmt2pixfmt(best);
 128
 129     vo_flags=vf->next->query_format(vf->next,best);
 130
 131     // scaling to dwidth*d_height, if all these TRUE:
 132     // - option -zoom
 133     // - no other sw/hw up/down scaling avail.
 134     // - we're after postproc
 135     // - user didn't set w:h
 136     if(!(vo_flags&VFCAP_POSTPROC) && (flags&4) &&
 137             vf->priv->w<0 && vf->priv->h<0){    // -zoom
 138         int x=(vo_flags&VFCAP_SWSCALE) ? 0 : 1;
 139         if(d_width<width || d_height<height){
 140             // downscale!
 141             if(vo_flags&VFCAP_HWSCALE_DOWN) x=0;
 142         } else {
 143             // upscale:
 144             if(vo_flags&VFCAP_HWSCALE_UP) x=0;
 145         }
 146         if(x){
 147             // user wants sw scaling! (-zoom)
 148             vf->priv->w=d_width;
 149             vf->priv->h=d_height;
 150         }
 151     }
 152
 153     if(vf->priv->noup){
 154         if((vf->priv->w > width) + (vf->priv->h > height) >= vf->priv->noup){
 155             vf->priv->w= width;
 156             vf->priv->h= height;
 157         }
 158     }
 159
 160     if (vf->priv->w <= -8) {
 161       vf->priv->w += 8;
 162       round_w = 1;
 163     }
 164     if (vf->priv->h <= -8) {
 165       vf->priv->h += 8;
 166       round_h = 1;
 167     }
 168
 169     if (vf->priv->w < -3 || vf->priv->h < -3 ||
 170          (vf->priv->w < -1 && vf->priv->h < -1)) {
 171       // TODO: establish a direct connection to the user's brain
 172       // and find out what the heck he thinks MPlayer should do
 173       // with this nonsense.
 174       mp_msg(MSGT_VFILTER, MSGL_ERR, "SwScale: EUSERBROKEN Check your parameters, they make no sense!\n");
 175       return 0;
 176     }
 177
 178     if (vf->priv->w == -1)
 179       vf->priv->w = width;
 180     if (vf->priv->w == 0)
 181       vf->priv->w = d_width;
 182
 183     if (vf->priv->h == -1)
 184       vf->priv->h = height;
 185     if (vf->priv->h == 0)
 186       vf->priv->h = d_height;
 187
 188     if (vf->priv->w == -3)
 189       vf->priv->w = vf->priv->h * width / height;
 190     if (vf->priv->w == -2)
 191       vf->priv->w = vf->priv->h * d_width / d_height;
 192
 193     if (vf->priv->h == -3)
 194       vf->priv->h = vf->priv->w * height / width;
 195     if (vf->priv->h == -2)
 196       vf->priv->h = vf->priv->w * d_height / d_width;
 197
 198     if (round_w)
 199       vf->priv->w = ((vf->priv->w + 8) / 16) * 16;
 200     if (round_h)
 201       vf->priv->h = ((vf->priv->h + 8) / 16) * 16;
 202
 203     // calculate the missing parameters:
 204     switch(best) {
 205     case IMGFMT_YV12:           /* YV12 needs w & h rounded to 2 */
 206     case IMGFMT_I420:
 207     case IMGFMT_IYUV:
 208     case IMGFMT_NV12:
 209     case IMGFMT_NV21:
 210       vf->priv->h = (vf->priv->h + 1) & ~1;
 211     case IMGFMT_YUY2:           /* YUY2 needs w rounded to 2 */
 212     case IMGFMT_UYVY:
 213       vf->priv->w = (vf->priv->w + 1) & ~1;
 214     }
 215
 216     mp_msg(MSGT_VFILTER,MSGL_DBG2,"SwScale: scaling %dx%d %s to %dx%d %s  \n",
 217         width,height,vo_format_name(outfmt),
 218         vf->priv->w,vf->priv->h,vo_format_name(best));
 219
 220     // free old ctx:
 221     if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
 222     if(vf->priv->ctx2)sws_freeContext(vf->priv->ctx2);
 223
 224     // new swscaler:
 225     sws_getFlagsAndFilterFromCmdLine(&int_sws_flags, &srcFilter, &dstFilter);
 226     int_sws_flags|= vf->priv->v_chr_drop << SWS_SRC_V_CHR_DROP_SHIFT;
 227     int_sws_flags|= vf->priv->accurate_rnd * SWS_ACCURATE_RND;
 228     vf->priv->ctx=sws_getContext(width, height >> vf->priv->interlaced,
 229             sfmt,
 230                   vf->priv->w, vf->priv->h >> vf->priv->interlaced,
 231             dfmt,
 232             int_sws_flags | get_sws_cpuflags(), srcFilter, dstFilter, vf->priv->param);
 233     if(vf->priv->interlaced){
 234         vf->priv->ctx2=sws_getContext(width, height >> 1,
 235             sfmt,
 236                   vf->priv->w, vf->priv->h >> 1,
 237             dfmt,
 238             int_sws_flags | get_sws_cpuflags(), srcFilter, dstFilter, vf->priv->param);
 239     }
 240     if(!vf->priv->ctx){
 241         // error...
 242         mp_msg(MSGT_VFILTER,MSGL_WARN,"Couldn't init SwScaler for this setup\n");
 243         return 0;
 244     }
 245     vf->priv->fmt=best;
 246
 247     if(vf->priv->palette){
 248         free(vf->priv->palette);
 249         vf->priv->palette=NULL;
 250     }
 251     switch(best){
 252     case IMGFMT_BGR8: {
 253       /* set 332 palette for 8 bpp */
 254         int i;
 255         vf->priv->palette=malloc(4*256);
 256         for(i=0; i<256; i++){
 257             vf->priv->palette[4*i+0]=4*(i&3)*21;
 258             vf->priv->palette[4*i+1]=4*((i>>2)&7)*9;
 259             vf->priv->palette[4*i+2]=4*((i>>5)&7)*9;
 260         }
 261         break; }
 262     case IMGFMT_BGR4:
 263     case IMGFMT_BG4B: {
 264         int i;
 265         vf->priv->palette=malloc(4*16);
 266         for(i=0; i<16; i++){
 267             vf->priv->palette[4*i+0]=4*(i&1)*63;
 268             vf->priv->palette[4*i+1]=4*((i>>1)&3)*21;
 269             vf->priv->palette[4*i+2]=4*((i>>3)&1)*63;
 270         }
 271         break; }
 272     }
 273
 274     if(!opt_screen_size_x && !opt_screen_size_y && !(screen_size_xy >= 0.001)){
 275         // Compute new d_width and d_height, preserving aspect
 276         // while ensuring that both are >= output size in pixels.
 277         if (vf->priv->h * d_width > vf->priv->w * d_height) {
 278                 d_width = vf->priv->h * d_width / d_height;
 279                 d_height = vf->priv->h;
 280         } else {
 281                 d_height = vf->priv->w * d_height / d_width;
 282                 d_width = vf->priv->w;
 283         }
 284         //d_width=d_width*vf->priv->w/width;
 285         //d_height=d_height*vf->priv->h/height;
 286     }
 287     return vf_next_config(vf,vf->priv->w,vf->priv->h,d_width,d_height,flags,best);
 288 }
 289
 290 static void start_slice(struct vf_instance_s* vf, mp_image_t *mpi){
 291 //    printf("start_slice called! flag=%d\n",mpi->flags&MP_IMGFLAG_DRAW_CALLBACK);
 292     if(!(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK)) return; // shouldn't happen
 293     // they want slices!!! allocate the buffer.
 294     mpi->priv=vf->dmpi=vf_get_image(vf->next,vf->priv->fmt,
 295 //      mpi->type, mpi->flags & (~MP_IMGFLAG_DRAW_CALLBACK),
 296         MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
 297         vf->priv->w, vf->priv->h);
 298 }
 299
 300 static void scale(struct SwsContext *sws1, struct SwsContext *sws2, uint8_t *src[3], int src_stride[3], int y, int h,
 301                   uint8_t *dst[3], int dst_stride[3], int interlaced){
 302     if(interlaced){
 303         int i;
 304         uint8_t *src2[3]={src[0], src[1], src[2]};
 305         uint8_t *dst2[3]={dst[0], dst[1], dst[2]};
 306         int src_stride2[3]={2*src_stride[0], 2*src_stride[1], 2*src_stride[2]};
 307         int dst_stride2[3]={2*dst_stride[0], 2*dst_stride[1], 2*dst_stride[2]};
 308
 309         sws_scale_ordered(sws1, src2, src_stride2, y>>1, h>>1, dst2, dst_stride2);
 310         for(i=0; i<3; i++){
 311             src2[i] += src_stride[i];
 312             dst2[i] += dst_stride[i];
 313         }
 314         sws_scale_ordered(sws2, src2, src_stride2, y>>1, h>>1, dst2, dst_stride2);
 315     }else{
 316         sws_scale_ordered(sws1, src, src_stride, y, h, dst, dst_stride);
 317     }
 318 }
 319
 320 static void draw_slice(struct vf_instance_s* vf,
 321         unsigned char** src, int* stride, int w,int h, int x, int y){
 322     mp_image_t *dmpi=vf->dmpi;
 323     if(!dmpi){
 324         mp_msg(MSGT_VFILTER,MSGL_FATAL,"vf_scale: draw_slice() called with dmpi=NULL (no get_image??)\n");
 325         return;
 326     }
 327 //    printf("vf_scale::draw_slice() y=%d h=%d\n",y,h);
 328     scale(vf->priv->ctx, vf->priv->ctx2, src, stride, y, h, dmpi->planes, dmpi->stride, vf->priv->interlaced);
 329 }
 330
 331 static int put_image(struct vf_instance_s* vf, mp_image_t *mpi, double pts){
 332     mp_image_t *dmpi=mpi->priv;
 333
 334 //    printf("vf_scale::put_image(): processing whole frame! dmpi=%p flag=%d\n",
 335 //      dmpi, (mpi->flags&MP_IMGFLAG_DRAW_CALLBACK));
 336
 337   if(!(mpi->flags&MP_IMGFLAG_DRAW_CALLBACK && dmpi)){
 338
 339     // hope we'll get DR buffer:
 340     dmpi=vf_get_image(vf->next,vf->priv->fmt,
 341         MP_IMGTYPE_TEMP, MP_IMGFLAG_ACCEPT_STRIDE | MP_IMGFLAG_PREFER_ALIGNED_STRIDE,
 342         vf->priv->w, vf->priv->h);
 343
 344       scale(vf->priv->ctx, vf->priv->ctx, mpi->planes,mpi->stride,0,mpi->h,dmpi->planes,dmpi->stride, vf->priv->interlaced);
 345   }
 346
 347     if(vf->priv->w==mpi->w && vf->priv->h==mpi->h){
 348         // just conversion, no scaling -> keep postprocessing data
 349         // this way we can apply pp filter to non-yv12 source using scaler
 350         vf_clone_mpi_attributes(dmpi, mpi);
 351     }
 352
 353     if(vf->priv->palette) dmpi->planes[1]=vf->priv->palette; // export palette!
 354
 355     return vf_next_put_image(vf,dmpi, pts);
 356 }
 357
 358 static int control(struct vf_instance_s* vf, int request, void* data){
 359     int *table;
 360     int *inv_table;
 361     int r;
 362     int brightness, contrast, saturation, srcRange, dstRange;
 363     vf_equalizer_t *eq;
 364
 365   if(vf->priv->ctx)
 366     switch(request){
 367     case VFCTRL_GET_EQUALIZER:
 368         r= sws_getColorspaceDetails(vf->priv->ctx, &inv_table, &srcRange, &table, &dstRange, &brightness, &contrast, &saturation);
 369         if(r<0) break;
 370
 371         eq = data;
 372         if (!strcmp(eq->item,"brightness")) {
 373                 eq->value =  ((brightness*100) + (1<<15))>>16;
 374         }
 375         else if (!strcmp(eq->item,"contrast")) {
 376                 eq->value = (((contrast  *100) + (1<<15))>>16) - 100;
 377         }
 378         else if (!strcmp(eq->item,"saturation")) {
 379                 eq->value = (((saturation*100) + (1<<15))>>16) - 100;
 380         }
 381         else
 382                 break;
 383         return CONTROL_TRUE;
 384     case VFCTRL_SET_EQUALIZER:
 385         r= sws_getColorspaceDetails(vf->priv->ctx, &inv_table, &srcRange, &table, &dstRange, &brightness, &contrast, &saturation);
 386         if(r<0) break;
 387 //printf("set %f %f %f\n", brightness/(float)(1<<16), contrast/(float)(1<<16), saturation/(float)(1<<16));
 388         eq = data;
 389
 390         if (!strcmp(eq->item,"brightness")) {
 391                 brightness = (( eq->value     <<16) + 50)/100;
 392         }
 393         else if (!strcmp(eq->item,"contrast")) {
 394                 contrast   = (((eq->value+100)<<16) + 50)/100;
 395         }
 396         else if (!strcmp(eq->item,"saturation")) {
 397                 saturation = (((eq->value+100)<<16) + 50)/100;
 398         }
 399         else
 400                 break;
 401
 402         r= sws_setColorspaceDetails(vf->priv->ctx, inv_table, srcRange, table, dstRange, brightness, contrast, saturation);
 403         if(r<0) break;
 404         if(vf->priv->ctx2){
 405             r= sws_setColorspaceDetails(vf->priv->ctx2, inv_table, srcRange, table, dstRange, brightness, contrast, saturation);
 406             if(r<0) break;
 407         }
 408
 409         return CONTROL_TRUE;
 410     default:
 411         break;
 412     }
 413
 414     return vf_next_control(vf,request,data);
 415 }
 416
 417 //===========================================================================//
 418
 419 //  supported Input formats: YV12, I420, IYUV, YUY2, UYVY, BGR32, BGR24, BGR16, BGR15, RGB32, RGB24, Y8, Y800
 420
 421 static int query_format(struct vf_instance_s* vf, unsigned int fmt){
 422     switch(fmt){
 423     case IMGFMT_YV12:
 424     case IMGFMT_I420:
 425     case IMGFMT_IYUV:
 426     case IMGFMT_UYVY:
 427     case IMGFMT_YUY2:
 428     case IMGFMT_BGR32:
 429     case IMGFMT_BGR24:
 430     case IMGFMT_BGR16:
 431     case IMGFMT_BGR15:
 432     case IMGFMT_RGB32:
 433     case IMGFMT_RGB24:
 434     case IMGFMT_Y800:
 435     case IMGFMT_Y8:
 436     case IMGFMT_YVU9:
 437     case IMGFMT_IF09:
 438     case IMGFMT_444P:
 439     case IMGFMT_422P:
 440     case IMGFMT_411P:
 441     {
 442         unsigned int best=find_best_out(vf);
 443         int flags;
 444         if(!best) return 0;      // no matching out-fmt
 445         flags=vf_next_query_format(vf,best);
 446         if(!(flags&(VFCAP_CSP_SUPPORTED|VFCAP_CSP_SUPPORTED_BY_HW))) return 0; // huh?
 447         if(fmt!=best) flags&=~VFCAP_CSP_SUPPORTED_BY_HW;
 448         // do not allow scaling, if we are before the PP fliter!
 449         if(!(flags&VFCAP_POSTPROC)) flags|=VFCAP_SWSCALE;
 450         return flags;
 451       }
 452     }
 453     return 0;   // nomatching in-fmt
 454 }
 455
 456 static void uninit(struct vf_instance_s *vf){
 457     if(vf->priv->ctx) sws_freeContext(vf->priv->ctx);
 458     if(vf->priv->ctx2) sws_freeContext(vf->priv->ctx2);
 459     if(vf->priv->palette) free(vf->priv->palette);
 460     free(vf->priv);
 461 }
 462
 463 static int open(vf_instance_t *vf, char* args){
 464     vf->config=config;
 465     vf->start_slice=start_slice;
 466     vf->draw_slice=draw_slice;
 467     vf->put_image=put_image;
 468     vf->query_format=query_format;
 469     vf->control= control;
 470     vf->uninit=uninit;
 471     if(!vf->priv) {
 472     vf->priv=malloc(sizeof(struct vf_priv_s));
 473     // TODO: parse args ->
 474     vf->priv->ctx=NULL;
 475     vf->priv->ctx2=NULL;
 476     vf->priv->w=
 477     vf->priv->h=-1;
 478     vf->priv->v_chr_drop=0;
 479     vf->priv->accurate_rnd=0;
 480     vf->priv->param[0]=
 481     vf->priv->param[1]=SWS_PARAM_DEFAULT;
 482     vf->priv->palette=NULL;
 483     } // if(!vf->priv)
 484     if(args) sscanf(args, "%d:%d:%d:%lf:%lf",
 485     &vf->priv->w,
 486     &vf->priv->h,
 487     &vf->priv->v_chr_drop,
 488     &vf->priv->param[0],
 489     &vf->priv->param[1]);
 490     mp_msg(MSGT_VFILTER,MSGL_V,"SwScale params: %d x %d (-1=no scaling)\n",
 491     vf->priv->w,
 492     vf->priv->h);
 493
 494     return 1;
 495 }
 496
 497 //global sws_flags from the command line
 498 int sws_flags=2;
 499
 500 //global srcFilter
 501 static SwsFilter *src_filter= NULL;
 502
 503 float sws_lum_gblur= 0.0;
 504 float sws_chr_gblur= 0.0;
 505 int sws_chr_vshift= 0;
 506 int sws_chr_hshift= 0;
 507 float sws_chr_sharpen= 0.0;
 508 float sws_lum_sharpen= 0.0;
 509
 510 int get_sws_cpuflags(void){
 511     return
 512           (gCpuCaps.hasMMX   ? SWS_CPU_CAPS_MMX   : 0)
 513         | (gCpuCaps.hasMMX2  ? SWS_CPU_CAPS_MMX2  : 0)
 514         | (gCpuCaps.has3DNow ? SWS_CPU_CAPS_3DNOW : 0)
 515         | (gCpuCaps.hasAltiVec ? SWS_CPU_CAPS_ALTIVEC : 0);
 516 }
 517
 518 void sws_getFlagsAndFilterFromCmdLine(int *flags, SwsFilter **srcFilterParam, SwsFilter **dstFilterParam)
 519 {
 520         static int firstTime=1;
 521         *flags=0;
 522
 523 #ifdef ARCH_X86
 524         if(gCpuCaps.hasMMX)
 525                 asm volatile("emms\n\t"::: "memory"); //FIXME this shouldnt be required but it IS (even for non mmx versions)
 526 #endif
 527         if(firstTime)
 528         {
 529                 firstTime=0;
 530                 *flags= SWS_PRINT_INFO;
 531         }
 532         else if( mp_msg_test(MSGT_VFILTER,MSGL_DBG2) ) *flags= SWS_PRINT_INFO;
 533
 534         if(src_filter) sws_freeFilter(src_filter);
 535
 536         src_filter= sws_getDefaultFilter(
 537                 sws_lum_gblur, sws_chr_gblur,
 538                 sws_lum_sharpen, sws_chr_sharpen,
 539                 sws_chr_hshift, sws_chr_vshift, verbose>1);
 540
 541         switch(sws_flags)
 542         {
 543                 case 0: *flags|= SWS_FAST_BILINEAR; break;
 544                 case 1: *flags|= SWS_BILINEAR; break;
 545                 case 2: *flags|= SWS_BICUBIC; break;
 546                 case 3: *flags|= SWS_X; break;
 547                 case 4: *flags|= SWS_POINT; break;
 548                 case 5: *flags|= SWS_AREA; break;
 549                 case 6: *flags|= SWS_BICUBLIN; break;
 550                 case 7: *flags|= SWS_GAUSS; break;
 551                 case 8: *flags|= SWS_SINC; break;
 552                 case 9: *flags|= SWS_LANCZOS; break;
 553                 case 10:*flags|= SWS_SPLINE; break;
 554                 default:*flags|= SWS_BILINEAR; break;
 555         }
 556
 557         *srcFilterParam= src_filter;
 558         *dstFilterParam= NULL;
 559 }
 560
 561 // will use sws_flags & src_filter (from cmd line)
 562 struct SwsContext *sws_getContextFromCmdLine(int srcW, int srcH, int srcFormat, int dstW, int dstH, int dstFormat)
 563 {
 564         int flags;
 565         SwsFilter *dstFilterParam, *srcFilterParam;
 566         enum PixelFormat dfmt, sfmt;
 567
 568         dfmt = imgfmt2pixfmt(dstFormat);
 569         sfmt = imgfmt2pixfmt(srcFormat);
 570         sws_getFlagsAndFilterFromCmdLine(&flags, &srcFilterParam, &dstFilterParam);
 571
 572         return sws_getContext(srcW, srcH, sfmt, dstW, dstH, dfmt, flags | get_sws_cpuflags(), srcFilterParam, dstFilterParam, NULL);
 573 }
 574
 575 /// An example of presets usage
 576 static struct size_preset {
 577   char* name;
 578   int w, h;
 579 } vf_size_presets_defs[] = {
 580   // TODO add more 'standard' resolutions
 581   { "qntsc", 352, 240 },
 582   { "qpal", 352, 288 },
 583   { "ntsc", 720, 480 },
 584   { "pal", 720, 576 },
 585   { "sntsc", 640, 480 },
 586   { "spal", 768, 576 },
 587   { NULL, 0, 0}
 588 };
 589
 590 #define ST_OFF(f) M_ST_OFF(struct size_preset,f)
 591 static m_option_t vf_size_preset_fields[] = {
 592   {"w", ST_OFF(w), CONF_TYPE_INT, M_OPT_MIN,1 ,0, NULL},
 593   {"h", ST_OFF(h), CONF_TYPE_INT, M_OPT_MIN,1 ,0, NULL},
 594   { NULL, NULL, 0, 0, 0, 0,  NULL }
 595 };
 596
 597 static m_struct_t vf_size_preset = {
 598   "scale_size_preset",
 599   sizeof(struct size_preset),
 600   NULL,
 601   vf_size_preset_fields
 602 };
 603
 604 static m_struct_t vf_opts;
 605 static m_obj_presets_t size_preset = {
 606   &vf_size_preset, // Input struct desc
 607   &vf_opts, // Output struct desc
 608   vf_size_presets_defs, // The list of presets
 609   ST_OFF(name) // At wich offset is the name field in the preset struct
 610 };
 611
 612 /// Now the options
 613 #undef ST_OFF
 614 #define ST_OFF(f) M_ST_OFF(struct vf_priv_s,f)
 615 static m_option_t vf_opts_fields[] = {
 616   {"w", ST_OFF(w), CONF_TYPE_INT, M_OPT_MIN,-11,0, NULL},
 617   {"h", ST_OFF(h), CONF_TYPE_INT, M_OPT_MIN,-11,0, NULL},
 618   {"interlaced", ST_OFF(interlaced), CONF_TYPE_INT, M_OPT_RANGE, 0, 1, NULL},
 619   {"chr-drop", ST_OFF(v_chr_drop), CONF_TYPE_INT, M_OPT_RANGE, 0, 3, NULL},
 620   {"param" , ST_OFF(param[0]), CONF_TYPE_DOUBLE, M_OPT_RANGE, 0.0, 100.0, NULL},
 621   {"param2", ST_OFF(param[1]), CONF_TYPE_DOUBLE, M_OPT_RANGE, 0.0, 100.0, NULL},
 622   // Note that here the 2 field is NULL (ie 0)
 623   // As we want this option to act on the option struct itself
 624   {"presize", 0, CONF_TYPE_OBJ_PRESETS, 0, 0, 0, &size_preset},
 625   {"noup", ST_OFF(noup), CONF_TYPE_INT, M_OPT_RANGE, 0, 2, NULL},
 626   {"arnd", ST_OFF(accurate_rnd), CONF_TYPE_FLAG, 0, 0, 1, NULL},
 627   { NULL, NULL, 0, 0, 0, 0,  NULL }
 628 };
 629
 630 static m_struct_t vf_opts = {
 631   "scale",
 632   sizeof(struct vf_priv_s),
 633   &vf_priv_dflt,
 634   vf_opts_fields
 635 };
 636
 637 vf_info_t vf_info_scale = {
 638     "software scaling",
 639     "scale",
 640     "A'rpi",
 641     "",
 642     open,
 643     &vf_opts
 644 };
 645
 646 //===========================================================================//