git.sesse.net Git - vlc/blob - src/video_output/vout_pictures.c

   1 /*****************************************************************************
   2  * vout_pictures.c : picture management functions
   3  *****************************************************************************
   4  * Copyright (C) 2000 VideoLAN
   5  * $Id: vout_pictures.c,v 1.29 2002/08/21 15:10:33 sam Exp $
   6  *
   7  * Authors: Vincent Seguin <seguin@via.ecp.fr>
   8  *          Samuel Hocevar <sam@zoy.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., 59 Temple Place - Suite 330, Boston, MA  02111, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28 #include <errno.h>                                                 /* ENOMEM */
  29 #include <stdlib.h>                                                /* free() */
  30 #include <stdio.h>                                              /* sprintf() */
  31 #include <string.h>                                            /* strerror() */
  32
  33 #include <vlc/vlc.h>
  34
  35 #include "video.h"
  36 #include "video_output.h"
  37
  38 #include "vout_pictures.h"
  39
  40 /*****************************************************************************
  41  * Local prototypes
  42  *****************************************************************************/
  43 static void CopyPicture( vout_thread_t *, picture_t *, picture_t * );
  44
  45 /*****************************************************************************
  46  * vout_DisplayPicture: display a picture
  47  *****************************************************************************
  48  * Remove the reservation flag of a picture, which will cause it to be ready for
  49  * display. The picture won't be displayed until vout_DatePicture has been
  50  * called.
  51  *****************************************************************************/
  52 void vout_DisplayPicture( vout_thread_t *p_vout, picture_t *p_pic )
  53 {
  54     vlc_mutex_lock( &p_vout->picture_lock );
  55     switch( p_pic->i_status )
  56     {
  57     case RESERVED_PICTURE:
  58         p_pic->i_status = RESERVED_DISP_PICTURE;
  59         break;
  60     case RESERVED_DATED_PICTURE:
  61         p_pic->i_status = READY_PICTURE;
  62         break;
  63     default:
  64         msg_Err( p_vout, "picture to display %p has invalid status %d",
  65                          p_pic, p_pic->i_status );
  66         break;
  67     }
  68
  69     vlc_mutex_unlock( &p_vout->picture_lock );
  70 }
  71
  72 /*****************************************************************************
  73  * vout_DatePicture: date a picture
  74  *****************************************************************************
  75  * Remove the reservation flag of a picture, which will cause it to be ready
  76  * for display. The picture won't be displayed until vout_DisplayPicture has
  77  * been called.
  78  *****************************************************************************/
  79 void vout_DatePicture( vout_thread_t *p_vout,
  80                        picture_t *p_pic, mtime_t date )
  81 {
  82     vlc_mutex_lock( &p_vout->picture_lock );
  83     p_pic->date = date;
  84     switch( p_pic->i_status )
  85     {
  86     case RESERVED_PICTURE:
  87         p_pic->i_status = RESERVED_DATED_PICTURE;
  88         break;
  89     case RESERVED_DISP_PICTURE:
  90         p_pic->i_status = READY_PICTURE;
  91         break;
  92     default:
  93         msg_Err( p_vout, "picture to date %p has invalid status %d",
  94                          p_pic, p_pic->i_status );
  95         break;
  96     }
  97
  98     vlc_mutex_unlock( &p_vout->picture_lock );
  99 }
 100
 101 /*****************************************************************************
 102  * vout_CreatePicture: allocate a picture in the video output heap.
 103  *****************************************************************************
 104  * This function creates a reserved image in the video output heap.
 105  * A null pointer is returned if the function fails. This method provides an
 106  * already allocated zone of memory in the picture data fields. It needs locking
 107  * since several pictures can be created by several producers threads.
 108  *****************************************************************************/
 109 picture_t *vout_CreatePicture( vout_thread_t *p_vout,
 110                                vlc_bool_t b_progressive,
 111                                vlc_bool_t b_top_field_first,
 112                                vlc_bool_t b_repeat_first_field )
 113 {
 114     int         i_pic;                                      /* picture index */
 115     picture_t * p_pic;
 116     picture_t * p_freepic = NULL;                      /* first free picture */
 117
 118     /* Get lock */
 119     vlc_mutex_lock( &p_vout->picture_lock );
 120
 121     /*
 122      * Look for an empty place. We start at 1 because the first
 123      * directbuffer is reserved for memcpy()ed pictures.
 124      */
 125     for( i_pic = 0; i_pic < I_RENDERPICTURES && p_freepic == NULL; i_pic++ )
 126     {
 127         p_pic = PP_RENDERPICTURE[ i_pic ];
 128
 129         /* If the picture we found is a memory buffer, and we have enough
 130          * pictures in the stack, and we might have enough room later for
 131          * a direct buffer, skip it. If no other pictures are found, the
 132          * video decoder will try again later. */
 133         if( p_vout->b_direct && ( p_vout->output.i_pictures > 5 )
 134              && ( p_pic->i_type != DIRECT_PICTURE ) )
 135         {
 136             break;
 137         }
 138
 139         switch( p_pic->i_status )
 140         {
 141             case DESTROYED_PICTURE:
 142                 /* Memory will not be reallocated, and function can end
 143                  * immediately - this is the best possible case, since no
 144                  * memory allocation needs to be done */
 145                 p_pic->i_status   = RESERVED_PICTURE;
 146                 p_pic->i_refcount = 0;
 147                 p_pic->b_force    = 0;
 148
 149                 p_pic->b_progressive        = b_progressive;
 150                 p_pic->b_repeat_first_field = b_repeat_first_field;
 151                 p_pic->b_top_field_first    = b_top_field_first;
 152
 153                 p_vout->i_heap_size++;
 154                 vlc_mutex_unlock( &p_vout->picture_lock );
 155                 return( p_pic );
 156
 157             case FREE_PICTURE:
 158                 /* Picture is empty and ready for allocation */
 159                 p_freepic = p_pic;
 160                 break;
 161
 162             default:
 163                 break;
 164         }
 165     }
 166
 167     /*
 168      * Prepare picture
 169      */
 170     if( p_freepic != NULL )
 171     {
 172         vout_AllocatePicture( p_vout, p_freepic,
 173                               p_vout->render.i_width, p_vout->render.i_height,
 174                               p_vout->render.i_chroma );
 175
 176         if( p_freepic->i_planes )
 177         {
 178             /* Copy picture information, set some default values */
 179             p_freepic->i_status   = RESERVED_PICTURE;
 180             p_freepic->i_type     = MEMORY_PICTURE;
 181
 182             p_freepic->i_refcount = 0;
 183             p_freepic->b_force = 0;
 184
 185             p_freepic->b_progressive        = b_progressive;
 186             p_freepic->b_repeat_first_field = b_repeat_first_field;
 187             p_freepic->b_top_field_first    = b_top_field_first;
 188
 189             p_freepic->i_matrix_coefficients = 1;
 190
 191             p_vout->i_heap_size++;
 192         }
 193         else
 194         {
 195             /* Memory allocation failed : set picture as empty */
 196             p_freepic->i_status = FREE_PICTURE;
 197             p_freepic = NULL;
 198
 199             msg_Err( p_vout, "picture allocation failed" );
 200         }
 201
 202         vlc_mutex_unlock( &p_vout->picture_lock );
 203
 204         return( p_freepic );
 205     }
 206
 207     /* No free or destroyed picture could be found, but the decoder
 208      * will try again in a while. */
 209     vlc_mutex_unlock( &p_vout->picture_lock );
 210
 211     return( NULL );
 212 }
 213
 214 /*****************************************************************************
 215  * vout_DestroyPicture: remove a permanent or reserved picture from the heap
 216  *****************************************************************************
 217  * This function frees a previously reserved picture or a permanent
 218  * picture. It is meant to be used when the construction of a picture aborted.
 219  * Note that the picture will be destroyed even if it is linked !
 220  *****************************************************************************/
 221 void vout_DestroyPicture( vout_thread_t *p_vout, picture_t *p_pic )
 222 {
 223     vlc_mutex_lock( &p_vout->picture_lock );
 224
 225 #ifdef DEBUG
 226     /* Check if picture status is valid */
 227     if( (p_pic->i_status != RESERVED_PICTURE) &&
 228         (p_pic->i_status != RESERVED_DATED_PICTURE) &&
 229         (p_pic->i_status != RESERVED_DISP_PICTURE) )
 230     {
 231         msg_Err( p_vout, "picture to destroy %p has invalid status %d",
 232                          p_pic, p_pic->i_status );
 233     }
 234 #endif
 235
 236     p_pic->i_status = DESTROYED_PICTURE;
 237     p_vout->i_heap_size--;
 238
 239     vlc_mutex_unlock( &p_vout->picture_lock );
 240 }
 241
 242 /*****************************************************************************
 243  * vout_LinkPicture: increment reference counter of a picture
 244  *****************************************************************************
 245  * This function increments the reference counter of a picture in the video
 246  * heap. It needs a lock since several producer threads can access the picture.
 247  *****************************************************************************/
 248 void vout_LinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
 249 {
 250     vlc_mutex_lock( &p_vout->picture_lock );
 251     p_pic->i_refcount++;
 252     vlc_mutex_unlock( &p_vout->picture_lock );
 253 }
 254
 255 /*****************************************************************************
 256  * vout_UnlinkPicture: decrement reference counter of a picture
 257  *****************************************************************************
 258  * This function decrement the reference counter of a picture in the video heap.
 259  *****************************************************************************/
 260 void vout_UnlinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
 261 {
 262     vlc_mutex_lock( &p_vout->picture_lock );
 263     p_pic->i_refcount--;
 264
 265     if( p_pic->i_refcount < 0 )
 266     {
 267         msg_Err( p_vout, "picture refcount is %i", p_pic->i_refcount );
 268         p_pic->i_refcount = 0;
 269     }
 270
 271     if( ( p_pic->i_refcount == 0 ) &&
 272         ( p_pic->i_status == DISPLAYED_PICTURE ) )
 273     {
 274         p_pic->i_status = DESTROYED_PICTURE;
 275         p_vout->i_heap_size--;
 276     }
 277
 278     vlc_mutex_unlock( &p_vout->picture_lock );
 279 }
 280
 281 /*****************************************************************************
 282  * vout_RenderPicture: render a picture
 283  *****************************************************************************
 284  * This function chooses whether the current picture needs to be copied
 285  * before rendering, does the subpicture magic, and tells the video output
 286  * thread which direct buffer needs to be displayed.
 287  *****************************************************************************/
 288 picture_t * vout_RenderPicture( vout_thread_t *p_vout, picture_t *p_pic,
 289                                                        subpicture_t *p_subpic )
 290 {
 291     if( p_pic == NULL )
 292     {
 293         /* XXX: subtitles */
 294
 295         return NULL;
 296     }
 297
 298     if( p_pic->i_type == DIRECT_PICTURE )
 299     {
 300         if( p_pic->i_refcount )
 301         {
 302             /* Picture is in a direct buffer and is still in use,
 303              * we need to copy it to another direct buffer before
 304              * displaying it if there are subtitles. */
 305             if( p_subpic != NULL )
 306             {
 307                 /* We have subtitles. First copy the picture to
 308                  * the spare direct buffer, then render the
 309                  * subtitles. */
 310                 CopyPicture( p_vout, p_pic, PP_OUTPUTPICTURE[0] );
 311
 312                 vout_RenderSubPictures( p_vout, PP_OUTPUTPICTURE[0], p_subpic );
 313
 314                 return PP_OUTPUTPICTURE[0];
 315             }
 316
 317             /* No subtitles, picture is in a directbuffer so
 318              * we can display it directly even if it is still
 319              * in use. */
 320             return p_pic;
 321         }
 322
 323         /* Picture is in a direct buffer but isn't used by the
 324          * decoder. We can safely render subtitles on it and
 325          * display it. */
 326         vout_RenderSubPictures( p_vout, p_pic, p_subpic );
 327
 328         return p_pic;
 329     }
 330
 331     /* Not a direct buffer. We either need to copy it to a direct buffer,
 332      * or render it if the chroma isn't the same. */
 333     if( p_vout->b_direct )
 334     {
 335         /* Picture is not in a direct buffer, but is exactly the
 336          * same size as the direct buffers. A memcpy() is enough,
 337          * then render the subtitles. */
 338         CopyPicture( p_vout, p_pic, PP_OUTPUTPICTURE[0] );
 339
 340         vout_RenderSubPictures( p_vout, PP_OUTPUTPICTURE[0], p_subpic );
 341
 342         return PP_OUTPUTPICTURE[0];
 343     }
 344
 345     /* Picture is not in a direct buffer, and needs to be converted to
 346      * another size/chroma. Then the subtitles need to be rendered as
 347      * well. This usually means software YUV, or hardware YUV with a
 348      * different chroma. */
 349
 350     /* Convert image to the first direct buffer */
 351     p_vout->chroma.pf_convert( p_vout, p_pic, &p_vout->p_picture[0] );
 352
 353     /* Render subpictures on the first direct buffer */
 354     vout_RenderSubPictures( p_vout, &p_vout->p_picture[0], p_subpic );
 355
 356     return &p_vout->p_picture[0];
 357 }
 358
 359 /*****************************************************************************
 360  * vout_PlacePicture: calculate image window coordinates
 361  *****************************************************************************
 362  * This function will be accessed by plugins. It calculates the relative
 363  * position of the output window and the image window.
 364  *****************************************************************************/
 365 void vout_PlacePicture( vout_thread_t *p_vout, int i_width, int i_height,
 366                         int *pi_x, int *pi_y, int *pi_width, int *pi_height )
 367 {
 368     if( (i_width <= 0) || (i_height <=0) )
 369     {
 370         *pi_width = *pi_height = *pi_x = *pi_y = 0;
 371
 372         return;
 373     }
 374
 375     if( p_vout->b_scale )
 376     {
 377         *pi_width = i_width;
 378         *pi_height = i_height;
 379     }
 380     else
 381     {
 382         *pi_width = __MIN( i_width, p_vout->render.i_width );
 383         *pi_height = __MIN( i_height, p_vout->render.i_height );
 384     }
 385
 386     if( VOUT_ASPECT_FACTOR * *pi_width / *pi_height < p_vout->render.i_aspect )
 387     {
 388         *pi_width = *pi_height * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
 389     }
 390     else
 391     {
 392         *pi_height = *pi_width * VOUT_ASPECT_FACTOR / p_vout->render.i_aspect;
 393     }
 394
 395     if( *pi_width > i_width )
 396     {
 397         *pi_width = i_width;
 398         *pi_height = VOUT_ASPECT_FACTOR * *pi_width / p_vout->render.i_aspect;
 399     }
 400
 401     if( *pi_height > i_height )
 402     {
 403         *pi_height = i_height;
 404         *pi_width = *pi_height * p_vout->render.i_aspect / VOUT_ASPECT_FACTOR;
 405     }
 406
 407     *pi_x = ( i_width - *pi_width ) / 2;
 408     *pi_y = ( i_height - *pi_height ) / 2;
 409 }
 410
 411 /*****************************************************************************
 412  * vout_AllocatePicture: allocate a new picture in the heap.
 413  *****************************************************************************
 414  * This function allocates a fake direct buffer in memory, which can be
 415  * used exactly like a video buffer. The video output thread then manages
 416  * how it gets displayed.
 417  *****************************************************************************/
 418 void vout_AllocatePicture( vout_thread_t *p_vout, picture_t *p_pic,
 419                            int i_width, int i_height, vlc_fourcc_t i_chroma )
 420 {
 421     int i_bytes, i_index;
 422
 423     /* Store default values */
 424     for( i_index = 0; i_index < VOUT_MAX_PLANES; i_index++ )
 425     {
 426         p_pic->p[i_index].p_pixels = NULL;
 427         p_pic->p[i_index].i_pixel_pitch = 1;
 428     }
 429
 430     /* Calculate coordinates */
 431     switch( i_chroma )
 432     {
 433         case FOURCC_I410:
 434             p_pic->p[ Y_PLANE ].i_lines = i_height;
 435             p_pic->p[ Y_PLANE ].i_pitch = i_width;
 436             p_pic->p[ Y_PLANE ].i_visible_pitch = p_pic->p[ Y_PLANE ].i_pitch;
 437             p_pic->p[ U_PLANE ].i_lines = i_height / 4;
 438             p_pic->p[ U_PLANE ].i_pitch = i_width / 4;
 439             p_pic->p[ U_PLANE ].i_visible_pitch = p_pic->p[ U_PLANE ].i_pitch;
 440             p_pic->p[ V_PLANE ].i_lines = i_height / 4;
 441             p_pic->p[ V_PLANE ].i_pitch = i_width / 4;
 442             p_pic->p[ V_PLANE ].i_visible_pitch = p_pic->p[ V_PLANE ].i_pitch;
 443             p_pic->i_planes = 3;
 444             break;
 445
 446         case FOURCC_YV12:
 447         case FOURCC_I420:
 448         case FOURCC_IYUV:
 449             p_pic->p[ Y_PLANE ].i_lines = i_height;
 450             p_pic->p[ Y_PLANE ].i_pitch = i_width;
 451             p_pic->p[ Y_PLANE ].i_visible_pitch = p_pic->p[ Y_PLANE ].i_pitch;
 452             p_pic->p[ U_PLANE ].i_lines = i_height / 2;
 453             p_pic->p[ U_PLANE ].i_pitch = i_width / 2;
 454             p_pic->p[ U_PLANE ].i_visible_pitch = p_pic->p[ U_PLANE ].i_pitch;
 455             p_pic->p[ V_PLANE ].i_lines = i_height / 2;
 456             p_pic->p[ V_PLANE ].i_pitch = i_width / 2;
 457             p_pic->p[ V_PLANE ].i_visible_pitch = p_pic->p[ V_PLANE ].i_pitch;
 458             p_pic->i_planes = 3;
 459             break;
 460
 461         case FOURCC_I422:
 462             p_pic->p[ Y_PLANE ].i_lines = i_height;
 463             p_pic->p[ Y_PLANE ].i_pitch = i_width;
 464             p_pic->p[ Y_PLANE ].i_visible_pitch = p_pic->p[ Y_PLANE ].i_pitch;
 465             p_pic->p[ U_PLANE ].i_lines = i_height;
 466             p_pic->p[ U_PLANE ].i_pitch = i_width / 2;
 467             p_pic->p[ U_PLANE ].i_visible_pitch = p_pic->p[ U_PLANE ].i_pitch;
 468             p_pic->p[ V_PLANE ].i_lines = i_height;
 469             p_pic->p[ V_PLANE ].i_pitch = i_width / 2;
 470             p_pic->p[ V_PLANE ].i_visible_pitch = p_pic->p[ V_PLANE ].i_pitch;
 471             p_pic->i_planes = 3;
 472             break;
 473
 474         case FOURCC_I444:
 475             p_pic->p[ Y_PLANE ].i_lines = i_height;
 476             p_pic->p[ Y_PLANE ].i_pitch = i_width;
 477             p_pic->p[ Y_PLANE ].i_visible_pitch = p_pic->p[ Y_PLANE ].i_pitch;
 478             p_pic->p[ U_PLANE ].i_lines = i_height;
 479             p_pic->p[ U_PLANE ].i_pitch = i_width;
 480             p_pic->p[ U_PLANE ].i_visible_pitch = p_pic->p[ U_PLANE ].i_pitch;
 481             p_pic->p[ V_PLANE ].i_lines = i_height;
 482             p_pic->p[ V_PLANE ].i_pitch = i_width;
 483             p_pic->p[ V_PLANE ].i_visible_pitch = p_pic->p[ V_PLANE ].i_pitch;
 484             p_pic->i_planes = 3;
 485             break;
 486
 487         case FOURCC_Y211:
 488             p_pic->p->i_lines = i_height;
 489             p_pic->p->i_pitch = i_width;
 490             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 491             p_pic->p->i_pixel_pitch = 4;
 492             p_pic->i_planes = 1;
 493             break;
 494
 495         case FOURCC_YUY2:
 496             p_pic->p->i_lines = i_height;
 497             p_pic->p->i_pitch = i_width * 2;
 498             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 499             p_pic->p->i_pixel_pitch = 4;
 500             p_pic->i_planes = 1;
 501             break;
 502
 503         case FOURCC_RGB2:
 504             p_pic->p->i_lines = i_height;
 505             p_pic->p->i_pitch = i_width;
 506             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 507             p_pic->p->i_pixel_pitch = 1;
 508             p_pic->i_planes = 1;
 509             break;
 510
 511         case FOURCC_RV15:
 512             p_pic->p->i_lines = i_height;
 513             p_pic->p->i_pitch = i_width * 2;
 514             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 515             p_pic->p->i_pixel_pitch = 2;
 516 /* FIXME: p_heap isn't always reachable
 517             p_pic->p_heap->i_rmask = 0x001f;
 518             p_pic->p_heap->i_gmask = 0x03e0;
 519             p_pic->p_heap->i_bmask = 0x7c00; */
 520             p_pic->i_planes = 1;
 521             break;
 522
 523         case FOURCC_RV16:
 524             p_pic->p->i_lines = i_height;
 525             p_pic->p->i_pitch = i_width * 2;
 526             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 527             p_pic->p->i_pixel_pitch = 2;
 528 /* FIXME: p_heap isn't always reachable
 529             p_pic->p_heap->i_rmask = 0x001f;
 530             p_pic->p_heap->i_gmask = 0x07e0;
 531             p_pic->p_heap->i_bmask = 0xf800; */
 532             p_pic->i_planes = 1;
 533             break;
 534
 535         case FOURCC_RV32:
 536             p_pic->p->i_lines = i_height;
 537             p_pic->p->i_pitch = i_width * 4;
 538             p_pic->p->i_visible_pitch = p_pic->p->i_pitch;
 539             p_pic->p->i_pixel_pitch = 4;
 540 /* FIXME: p_heap isn't always reachable
 541             p_pic->p_heap->i_rmask = 0xff0000;
 542             p_pic->p_heap->i_gmask = 0x00ff00;
 543             p_pic->p_heap->i_bmask = 0x0000ff; */
 544             p_pic->i_planes = 1;
 545             break;
 546
 547         default:
 548             msg_Err( p_vout, "unknown chroma type 0x%.8x (%4.4s)",
 549                              i_chroma, (char*)&i_chroma );
 550             p_pic->i_planes = 0;
 551             return;
 552     }
 553
 554     /* Calculate how big the new image should be */
 555     for( i_bytes = 0, i_index = 0; i_index < p_pic->i_planes; i_index++ )
 556     {
 557         i_bytes += p_pic->p[ i_index ].i_lines * p_pic->p[ i_index ].i_pitch;
 558     }
 559
 560     p_pic->p_data = vlc_memalign( &p_pic->p_data_orig, 16, i_bytes );
 561
 562     if( p_pic->p_data == NULL )
 563     {
 564         p_pic->i_planes = 0;
 565         return;
 566     }
 567
 568     /* Fill the p_pixels field for each plane */
 569     p_pic->p[ 0 ].p_pixels = p_pic->p_data;
 570
 571     for( i_index = 1; i_index < p_pic->i_planes; i_index++ )
 572     {
 573         p_pic->p[i_index].p_pixels = p_pic->p[i_index-1].p_pixels
 574                                           + p_pic->p[i_index-1].i_lines
 575                                              * p_pic->p[i_index-1].i_pitch;
 576     }
 577 }
 578
 579 /*****************************************************************************
 580  * vout_ChromaCmp: compare two chroma values
 581  *****************************************************************************
 582  * This function returns 1 if the two fourcc values given as argument are
 583  * the same format (eg. UYVY / UYNV) or almost the same format (eg. I420/YV12)
 584  *****************************************************************************/
 585 int vout_ChromaCmp( vlc_fourcc_t i_chroma, vlc_fourcc_t i_amorhc )
 586 {
 587     /* If they are the same, they are the same ! */
 588     if( i_chroma == i_amorhc )
 589     {
 590         return 1;
 591     }
 592
 593     /* Check for equivalence classes */
 594     switch( i_chroma )
 595     {
 596         case FOURCC_I420:
 597         case FOURCC_IYUV:
 598         case FOURCC_YV12:
 599             switch( i_amorhc )
 600             {
 601                 case FOURCC_I420:
 602                 case FOURCC_IYUV:
 603                 case FOURCC_YV12:
 604                     return 1;
 605
 606                 default:
 607                     return 0;
 608             }
 609
 610         case FOURCC_UYVY:
 611         case FOURCC_UYNV:
 612         case FOURCC_Y422:
 613             switch( i_amorhc )
 614             {
 615                 case FOURCC_UYVY:
 616                 case FOURCC_UYNV:
 617                 case FOURCC_Y422:
 618                     return 1;
 619
 620                 default:
 621                     return 0;
 622             }
 623
 624         case FOURCC_YUY2:
 625         case FOURCC_YUNV:
 626             switch( i_amorhc )
 627             {
 628                 case FOURCC_YUY2:
 629                 case FOURCC_YUNV:
 630                     return 1;
 631
 632                 default:
 633                     return 0;
 634             }
 635
 636         default:
 637             return 0;
 638     }
 639 }
 640
 641 /* Following functions are local */
 642
 643 /*****************************************************************************
 644  * CopyPicture: copy a picture to another one
 645  *****************************************************************************
 646  * This function takes advantage of the image format, and reduces the
 647  * number of calls to memcpy() to the minimum. Source and destination
 648  * images must have same width (hence i_visible_pitch), height, and chroma.
 649  *****************************************************************************/
 650 static void CopyPicture( vout_thread_t * p_vout,
 651                          picture_t *p_src, picture_t *p_dest )
 652 {
 653     int i;
 654
 655     for( i = 0; i < p_src->i_planes ; i++ )
 656     {
 657         if( p_src->p[i].i_pitch == p_dest->p[i].i_pitch )
 658         {
 659             /* There are margins, but with the same width : perfect ! */
 660             p_vout->p_vlc->pf_memcpy(
 661                          p_dest->p[i].p_pixels, p_src->p[i].p_pixels,
 662                          p_src->p[i].i_pitch * p_src->p[i].i_lines );
 663         }
 664         else
 665         {
 666             /* We need to proceed line by line */
 667             u8 *p_in = p_src->p[i].p_pixels, *p_out = p_dest->p[i].p_pixels;
 668             int i_line;
 669
 670             for( i_line = p_src->p[i].i_lines; i_line--; )
 671             {
 672                 p_vout->p_vlc->pf_memcpy( p_out, p_in,
 673                                           p_src->p[i].i_visible_pitch );
 674                 p_in += p_src->p[i].i_pitch;
 675                 p_out += p_dest->p[i].i_pitch;
 676             }
 677         }
 678     }
 679 }
 680