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

   1 /*****************************************************************************
   2  * vout_pictures.c : picture management functions
   3  *****************************************************************************
   4  * Copyright (C) 2000-2004 the VideoLAN team
   5  * $Id$
   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., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  23  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32 #include <assert.h>
  33
  34 #include <vlc_common.h>
  35 #include <libvlc.h>
  36 #include <vlc_vout.h>
  37 #include <vlc_osd.h>
  38 #include <vlc_filter.h>
  39 #include <vlc_image.h>
  40 #include <vlc_block.h>
  41 #include <vlc_picture_fifo.h>
  42 #include <vlc_picture_pool.h>
  43
  44 #include "vout_pictures.h"
  45 #include "vout_internal.h"
  46
  47 /**
  48  * Display a picture
  49  *
  50  * Remove the reservation flag of a picture, which will cause it to be ready
  51  * for display.
  52  */
  53 void vout_DisplayPicture( vout_thread_t *p_vout, picture_t *p_pic )
  54 {
  55     vlc_mutex_lock( &p_vout->picture_lock );
  56
  57     if( p_pic->i_status == RESERVED_PICTURE )
  58     {
  59         p_pic->i_status = READY_PICTURE;
  60         vlc_cond_signal( &p_vout->p->picture_wait );
  61     }
  62     else
  63     {
  64         msg_Err( p_vout, "picture to display %p has invalid status %d",
  65                          p_pic, p_pic->i_status );
  66     }
  67     p_vout->p->i_picture_qtype = p_pic->i_qtype;
  68     p_vout->p->b_picture_interlaced = !p_pic->b_progressive;
  69
  70     vlc_mutex_unlock( &p_vout->picture_lock );
  71 }
  72
  73 /**
  74  * Allocate a picture in the video output heap.
  75  *
  76  * This function creates a reserved image in the video output heap.
  77  * A null pointer is returned if the function fails. This method provides an
  78  * already allocated zone of memory in the picture data fields.
  79  * It needs locking since several pictures can be created by several producers
  80  * threads.
  81  */
  82 int vout_CountPictureAvailable( vout_thread_t *p_vout )
  83 {
  84     int i_free = 0;
  85     int i_pic;
  86
  87     vlc_mutex_lock( &p_vout->picture_lock );
  88     for( i_pic = 0; i_pic < I_RENDERPICTURES; i_pic++ )
  89     {
  90         picture_t *p_pic = PP_RENDERPICTURE[(p_vout->render.i_last_used_pic + i_pic + 1) % I_RENDERPICTURES];
  91
  92         switch( p_pic->i_status )
  93         {
  94             case DESTROYED_PICTURE:
  95                 i_free++;
  96                 break;
  97
  98             case FREE_PICTURE:
  99                 i_free++;
 100                 break;
 101
 102             default:
 103                 break;
 104         }
 105     }
 106     vlc_mutex_unlock( &p_vout->picture_lock );
 107
 108     return i_free;
 109 }
 110
 111 picture_t *vout_CreatePicture( vout_thread_t *p_vout,
 112                                bool b_progressive,
 113                                bool b_top_field_first,
 114                                unsigned int i_nb_fields )
 115 {
 116     int         i_pic;                                      /* picture index */
 117     picture_t * p_pic;
 118     picture_t * p_freepic = NULL;                      /* first free picture */
 119
 120     /* Get lock */
 121     vlc_mutex_lock( &p_vout->picture_lock );
 122
 123     /*
 124      * Look for an empty place in the picture heap.
 125      */
 126     for( i_pic = 0; i_pic < I_RENDERPICTURES; i_pic++ )
 127     {
 128         p_pic = PP_RENDERPICTURE[(p_vout->render.i_last_used_pic + i_pic + 1)
 129                                  % I_RENDERPICTURES];
 130
 131         switch( p_pic->i_status )
 132         {
 133             case DESTROYED_PICTURE:
 134                 /* Memory will not be reallocated, and function can end
 135                  * immediately - this is the best possible case, since no
 136                  * memory allocation needs to be done */
 137                 p_pic->i_status   = RESERVED_PICTURE;
 138                 p_pic->i_refcount = 0;
 139                 p_pic->b_force    = 0;
 140
 141                 p_pic->b_progressive        = b_progressive;
 142                 p_pic->i_nb_fields          = i_nb_fields;
 143                 p_pic->b_top_field_first    = b_top_field_first;
 144
 145                 p_vout->render.i_last_used_pic =
 146                     ( p_vout->render.i_last_used_pic + i_pic + 1 )
 147                     % I_RENDERPICTURES;
 148                 vlc_mutex_unlock( &p_vout->picture_lock );
 149                 return( p_pic );
 150
 151             case FREE_PICTURE:
 152                 /* Picture is empty and ready for allocation */
 153                 p_vout->render.i_last_used_pic =
 154                     ( p_vout->render.i_last_used_pic + i_pic + 1 )
 155                     % I_RENDERPICTURES;
 156                 p_freepic = p_pic;
 157                 break;
 158
 159             default:
 160                 break;
 161         }
 162     }
 163
 164     /*
 165      * Prepare picture
 166      */
 167     if( p_freepic != NULL )
 168     {
 169         vout_AllocatePicture( VLC_OBJECT(p_vout),
 170                               p_freepic, p_vout->render.i_chroma,
 171                               p_vout->render.i_width, p_vout->render.i_height,
 172                               p_vout->render.i_aspect * p_vout->render.i_height,
 173                               VOUT_ASPECT_FACTOR      * p_vout->render.i_width);
 174
 175         if( p_freepic->i_planes )
 176         {
 177             /* Copy picture information, set some default values */
 178             p_freepic->i_status   = RESERVED_PICTURE;
 179             p_freepic->i_type     = MEMORY_PICTURE;
 180             p_freepic->b_slow     = 0;
 181
 182             p_freepic->i_refcount = 0;
 183             p_freepic->b_force = 0;
 184
 185             p_freepic->b_progressive        = b_progressive;
 186             p_freepic->i_nb_fields          = i_nb_fields;
 187             p_freepic->b_top_field_first    = b_top_field_first;
 188
 189         }
 190         else
 191         {
 192             /* Memory allocation failed : set picture as empty */
 193             p_freepic->i_status = FREE_PICTURE;
 194             p_freepic = NULL;
 195
 196             msg_Err( p_vout, "picture allocation failed" );
 197         }
 198
 199         vlc_mutex_unlock( &p_vout->picture_lock );
 200
 201         return( p_freepic );
 202     }
 203
 204     /* No free or destroyed picture could be found, but the decoder
 205      * will try again in a while. */
 206     vlc_mutex_unlock( &p_vout->picture_lock );
 207
 208     return( NULL );
 209 }
 210
 211 /* */
 212 static void DestroyPicture( vout_thread_t *p_vout, picture_t *p_picture )
 213 {
 214     vlc_assert_locked( &p_vout->picture_lock );
 215
 216     p_picture->i_status = DESTROYED_PICTURE;
 217     picture_CleanupQuant( p_picture );
 218
 219     vlc_cond_signal( &p_vout->p->picture_wait );
 220 }
 221
 222 /**
 223  * Remove a permanent or reserved picture from the heap
 224  *
 225  * This function frees a previously reserved picture or a permanent
 226  * picture. It is meant to be used when the construction of a picture aborted.
 227  * Note that the picture will be destroyed even if it is linked !
 228  *
 229  * TODO remove it, vout_DropPicture should be used instead
 230  */
 231 void vout_DestroyPicture( vout_thread_t *p_vout, picture_t *p_pic )
 232 {
 233 #ifndef NDEBUG
 234     /* Check if picture status is valid */
 235     vlc_mutex_lock( &p_vout->picture_lock );
 236     if( p_pic->i_status != RESERVED_PICTURE )
 237     {
 238         msg_Err( p_vout, "picture to destroy %p has invalid status %d",
 239                          p_pic, p_pic->i_status );
 240     }
 241     vlc_mutex_unlock( &p_vout->picture_lock );
 242 #endif
 243
 244     vout_DropPicture( p_vout, p_pic );
 245 }
 246
 247 /* */
 248 void vout_UsePictureLocked( vout_thread_t *p_vout, picture_t *p_picture )
 249 {
 250     vlc_assert_locked( &p_vout->picture_lock );
 251     if( p_picture->i_refcount > 0 )
 252     {
 253         /* Pretend we displayed the picture, but don't destroy
 254          * it since the decoder might still need it. */
 255         p_picture->i_status = DISPLAYED_PICTURE;
 256     }
 257     else
 258     {
 259         /* Destroy the picture without displaying it */
 260         DestroyPicture( p_vout, p_picture );
 261     }
 262 }
 263
 264 /* */
 265 void vout_DropPicture( vout_thread_t *p_vout, picture_t *p_pic  )
 266 {
 267     vlc_mutex_lock( &p_vout->picture_lock );
 268
 269     if( p_pic->i_status == READY_PICTURE )
 270     {
 271         /* Grr cannot destroy ready picture by myself so be sure vout won't like it */
 272         p_pic->date = 1;
 273         vlc_cond_signal( &p_vout->p->picture_wait );
 274     }
 275     else
 276     {
 277         vout_UsePictureLocked( p_vout, p_pic );
 278     }
 279
 280     vlc_mutex_unlock( &p_vout->picture_lock );
 281 }
 282
 283 /**
 284  * Increment reference counter of a picture
 285  *
 286  * This function increments the reference counter of a picture in the video
 287  * heap. It needs a lock since several producer threads can access the picture.
 288  */
 289 void vout_LinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
 290 {
 291     vlc_mutex_lock( &p_vout->picture_lock );
 292     p_pic->i_refcount++;
 293     vlc_mutex_unlock( &p_vout->picture_lock );
 294 }
 295
 296 /**
 297  * Decrement reference counter of a picture
 298  *
 299  * This function decrement the reference counter of a picture in the video heap
 300  */
 301 void vout_UnlinkPicture( vout_thread_t *p_vout, picture_t *p_pic )
 302 {
 303     vlc_mutex_lock( &p_vout->picture_lock );
 304
 305     if( p_pic->i_refcount > 0 )
 306         p_pic->i_refcount--;
 307     else
 308         msg_Err( p_vout, "Invalid picture reference count (%p, %d)",
 309                  p_pic, p_pic->i_refcount );
 310
 311     if( p_pic->i_refcount == 0 &&
 312         ( p_pic->i_status == DISPLAYED_PICTURE || p_pic->i_status == RESERVED_PICTURE ) )
 313         DestroyPicture( p_vout, p_pic );
 314
 315     vlc_mutex_unlock( &p_vout->picture_lock );
 316 }
 317
 318 /**
 319  * Render a picture
 320  *
 321  * This function chooses whether the current picture needs to be copied
 322  * before rendering, does the subpicture magic, and tells the video output
 323  * thread which direct buffer needs to be displayed.
 324  */
 325 picture_t *vout_RenderPicture( vout_thread_t *p_vout, picture_t *p_pic,
 326                                subpicture_t *p_subpic, mtime_t render_date )
 327 {
 328     if( p_pic == NULL )
 329         return NULL;
 330
 331     if( p_pic->i_type == DIRECT_PICTURE && !p_subpic )
 332     {
 333         /* No subtitles, picture is in a directbuffer so
 334          * we can display it directly (even if it is still
 335          * in use or not). */
 336         return p_pic;
 337     }
 338
 339     /* It is either because:
 340      *  - the picture is not a direct buffer
 341      *  - we have to render subtitles (we can never do it on the given
 342      *  picture even if not referenced).
 343      */
 344     picture_t *p_render;
 345     if( p_subpic != NULL && PP_OUTPUTPICTURE[0]->b_slow )
 346     {
 347         /* The picture buffer is in slow memory. We'll use
 348          * the "2 * VOUT_MAX_PICTURES + 1" picture as a temporary
 349          * one for subpictures rendering. */
 350         p_render = &p_vout->p_picture[2 * VOUT_MAX_PICTURES];
 351         if( p_render->i_status == FREE_PICTURE )
 352         {
 353             vout_AllocatePicture( VLC_OBJECT(p_vout),
 354                                   p_render, p_vout->fmt_out.i_chroma,
 355                                   p_vout->fmt_out.i_width,
 356                                   p_vout->fmt_out.i_height,
 357                                   p_vout->fmt_out.i_sar_num,
 358                                   p_vout->fmt_out.i_sar_den );
 359             p_render->i_type = MEMORY_PICTURE;
 360             p_render->i_status = RESERVED_PICTURE;
 361         }
 362     }
 363     else
 364     {
 365         /* We can directly render into a direct buffer */
 366         p_render = PP_OUTPUTPICTURE[0];
 367     }
 368
 369     /* Copy */
 370     picture_Copy( p_render, p_pic );
 371
 372     /* Render the subtitles if present */
 373     if( p_subpic )
 374         spu_RenderSubpictures( p_vout->p->p_spu,
 375                                p_render, &p_vout->fmt_out,
 376                                p_subpic, &p_vout->fmt_in, render_date );
 377     /* Copy in case we used a temporary fast buffer */
 378     if( p_render != PP_OUTPUTPICTURE[0] )
 379         picture_Copy( PP_OUTPUTPICTURE[0], p_render );
 380
 381     return PP_OUTPUTPICTURE[0];
 382 }
 383
 384 #undef vout_AllocatePicture
 385 /**
 386  * Allocate a new picture in the heap.
 387  *
 388  * This function allocates a fake direct buffer in memory, which can be
 389  * used exactly like a video buffer. The video output thread then manages
 390  * how it gets displayed.
 391  */
 392 int vout_AllocatePicture( vlc_object_t *p_this, picture_t *p_pic,
 393                           vlc_fourcc_t i_chroma,
 394                           int i_width, int i_height,
 395                           int i_sar_num, int i_sar_den )
 396 {
 397     VLC_UNUSED(p_this);
 398
 399     /* Make sure the real dimensions are a multiple of 16 */
 400     if( picture_Setup( p_pic, i_chroma, i_width, i_height,
 401                        i_sar_num, i_sar_den ) != VLC_SUCCESS )
 402         return VLC_EGENERIC;
 403
 404     /* Calculate how big the new image should be */
 405     size_t i_bytes = 0;
 406     for( int i = 0; i < p_pic->i_planes; i++ )
 407     {
 408         const plane_t *p = &p_pic->p[i];
 409
 410         if( p->i_pitch <= 0 || p->i_lines <= 0 ||
 411             p->i_pitch > (SIZE_MAX - i_bytes)/p->i_lines )
 412         {
 413             p_pic->i_planes = 0;
 414             return VLC_ENOMEM;
 415         }
 416         i_bytes += p->i_pitch * p->i_lines;
 417     }
 418
 419     p_pic->p_data = vlc_memalign( &p_pic->p_data_orig, 16, i_bytes );
 420     if( p_pic->p_data == NULL )
 421     {
 422         p_pic->i_planes = 0;
 423         return VLC_EGENERIC;
 424     }
 425
 426     /* Fill the p_pixels field for each plane */
 427     p_pic->p[0].p_pixels = p_pic->p_data;
 428     for( int i = 1; i < p_pic->i_planes; i++ )
 429     {
 430         p_pic->p[i].p_pixels = &p_pic->p[i-1].p_pixels[ p_pic->p[i-1].i_lines *
 431                                                         p_pic->p[i-1].i_pitch ];
 432     }
 433
 434     return VLC_SUCCESS;
 435 }
 436
 437 /*****************************************************************************
 438  *
 439  *****************************************************************************/
 440 static void PictureReleaseCallback( picture_t *p_picture )
 441 {
 442     if( --p_picture->i_refcount > 0 )
 443         return;
 444     picture_Delete( p_picture );
 445 }
 446
 447 /*****************************************************************************
 448  *
 449  *****************************************************************************/
 450 void picture_Reset( picture_t *p_picture )
 451 {
 452     /* */
 453     p_picture->date = VLC_TS_INVALID;
 454     p_picture->b_force = false;
 455     p_picture->b_progressive = false;
 456     p_picture->i_nb_fields = 0;
 457     p_picture->b_top_field_first = false;
 458     picture_CleanupQuant( p_picture );
 459 }
 460
 461 /*****************************************************************************
 462  *
 463  *****************************************************************************/
 464 typedef struct
 465 {
 466     unsigned     i_plane_count;
 467     struct
 468     {
 469         struct
 470         {
 471             unsigned i_num;
 472             unsigned i_den;
 473         } w;
 474         struct
 475         {
 476             unsigned i_num;
 477             unsigned i_den;
 478         } h;
 479     } p[VOUT_MAX_PLANES];
 480     unsigned i_pixel_size;
 481
 482 } chroma_description_t;
 483
 484 #define PLANAR(n, w_den, h_den) \
 485     { n, { {{1,1}, {1,1}}, {{1,w_den}, {1,h_den}}, {{1,w_den}, {1,h_den}}, {{1,1}, {1,1}} }, 1 }
 486 #define PACKED(size) \
 487     { 1, { {{1,1}, {1,1}} }, size }
 488
 489 static const struct
 490 {
 491     vlc_fourcc_t            p_fourcc[5];
 492     chroma_description_t    description;
 493 } p_chromas[] = {
 494     { { VLC_CODEC_I411, 0 },                                 PLANAR(3, 4, 1) },
 495     { { VLC_CODEC_I410, VLC_CODEC_YV9, 0 },                  PLANAR(3, 4, 4) },
 496     { { VLC_CODEC_YV12, VLC_CODEC_I420, VLC_CODEC_J420, 0 }, PLANAR(3, 2, 2) },
 497     { { VLC_CODEC_I422, VLC_CODEC_J422, 0 },                 PLANAR(3, 2, 1) },
 498     { { VLC_CODEC_I440, VLC_CODEC_J440, 0 },                 PLANAR(3, 1, 2) },
 499     { { VLC_CODEC_I444, VLC_CODEC_J444, 0 },                 PLANAR(3, 1, 1) },
 500     { { VLC_CODEC_YUVA, 0 },                                 PLANAR(4, 1, 1) },
 501
 502     { { VLC_CODEC_UYVY, VLC_CODEC_VYUY, VLC_CODEC_YUYV, VLC_CODEC_YVYU, 0 }, PACKED(2) },
 503     { { VLC_CODEC_RGB8, VLC_CODEC_GREY, VLC_CODEC_YUVP, VLC_CODEC_RGBP, 0 }, PACKED(1) },
 504     { { VLC_CODEC_RGB16, VLC_CODEC_RGB15, 0 },                               PACKED(2) },
 505     { { VLC_CODEC_RGB24, 0 },                                                PACKED(3) },
 506     { { VLC_CODEC_RGB32, VLC_CODEC_RGBA, 0 },                                PACKED(4) },
 507
 508     { { VLC_CODEC_Y211, 0 }, { 1, { {{1,4}, {1,1}} }, 4 } },
 509
 510     { {0}, { 0, {}, 0 } }
 511 };
 512
 513 #undef PACKED
 514 #undef PLANAR
 515
 516 static const chroma_description_t *vlc_fourcc_GetChromaDescription( vlc_fourcc_t i_fourcc )
 517 {
 518     for( unsigned i = 0; p_chromas[i].p_fourcc[0]; i++ )
 519     {
 520         const vlc_fourcc_t *p_fourcc = p_chromas[i].p_fourcc;
 521         for( unsigned j = 0; p_fourcc[j]; j++ )
 522         {
 523             if( p_fourcc[j] == i_fourcc )
 524                 return &p_chromas[i].description;
 525         }
 526     }
 527     return NULL;
 528 }
 529
 530 static int LCM( int a, int b )
 531 {
 532     return a * b / GCD( a, b );
 533 }
 534
 535 int picture_Setup( picture_t *p_picture, vlc_fourcc_t i_chroma,
 536                    int i_width, int i_height, int i_sar_num, int i_sar_den )
 537 {
 538     /* Store default values */
 539     p_picture->i_planes = 0;
 540     for( unsigned i = 0; i < VOUT_MAX_PLANES; i++ )
 541     {
 542         plane_t *p = &p_picture->p[i];
 543         p->p_pixels = NULL;
 544         p->i_pixel_pitch = 0;
 545     }
 546
 547     p_picture->pf_release = NULL;
 548     p_picture->p_release_sys = NULL;
 549     p_picture->i_refcount = 0;
 550
 551     p_picture->i_qtype = QTYPE_NONE;
 552     p_picture->i_qstride = 0;
 553     p_picture->p_q = NULL;
 554
 555     video_format_Setup( &p_picture->format, i_chroma, i_width, i_height,
 556                         i_sar_num, i_sar_den );
 557
 558     const chroma_description_t *p_dsc =
 559         vlc_fourcc_GetChromaDescription( p_picture->format.i_chroma );
 560     if( !p_dsc )
 561         return VLC_EGENERIC;
 562
 563     /* We want V (width/height) to respect:
 564         (V * p_dsc->p[i].w.i_num) % p_dsc->p[i].w.i_den == 0
 565         (V * p_dsc->p[i].w.i_num/p_dsc->p[i].w.i_den * p_dsc->i_pixel_size) % 16 == 0
 566        Which is respected if you have
 567        V % lcm( p_dsc->p[0..planes].w.i_den * 16) == 0
 568     */
 569     int i_modulo_w = 1;
 570     int i_modulo_h = 1;
 571     int i_ratio_h  = 1;
 572     for( unsigned i = 0; i < p_dsc->i_plane_count; i++ )
 573     {
 574         i_modulo_w = LCM( i_modulo_w, 16 * p_dsc->p[i].w.i_den );
 575         i_modulo_h = LCM( i_modulo_h, 16 * p_dsc->p[i].h.i_den );
 576         if( i_ratio_h < p_dsc->p[i].h.i_den )
 577             i_ratio_h = p_dsc->p[i].h.i_den;
 578     }
 579
 580     const int i_width_aligned  = ( i_width  + i_modulo_w - 1 ) / i_modulo_w * i_modulo_w;
 581     const int i_height_aligned = ( i_height + i_modulo_h - 1 ) / i_modulo_h * i_modulo_h;
 582     const int i_height_extra   = 2 * i_ratio_h; /* This one is a hack for some ASM functions */
 583     for( unsigned i = 0; i < p_dsc->i_plane_count; i++ )
 584     {
 585         plane_t *p = &p_picture->p[i];
 586
 587         p->i_lines         = (i_height_aligned + i_height_extra ) * p_dsc->p[i].h.i_num / p_dsc->p[i].h.i_den;
 588         p->i_visible_lines = i_height * p_dsc->p[i].h.i_num / p_dsc->p[i].h.i_den;
 589         p->i_pitch         = i_width_aligned * p_dsc->p[i].w.i_num / p_dsc->p[i].w.i_den * p_dsc->i_pixel_size;
 590         p->i_visible_pitch = i_width * p_dsc->p[i].w.i_num / p_dsc->p[i].w.i_den * p_dsc->i_pixel_size;
 591         p->i_pixel_pitch   = p_dsc->i_pixel_size;
 592
 593         assert( (p->i_pitch % 16) == 0 );
 594     }
 595     p_picture->i_planes  = p_dsc->i_plane_count;
 596
 597     return VLC_SUCCESS;
 598 }
 599
 600 /*****************************************************************************
 601  *
 602  *****************************************************************************/
 603 picture_t *picture_NewFromResource( const video_format_t *p_fmt, const picture_resource_t *p_resource )
 604 {
 605     video_format_t fmt = *p_fmt;
 606
 607     /* It is needed to be sure all informations are filled */
 608     video_format_Setup( &fmt, p_fmt->i_chroma,
 609                               p_fmt->i_width, p_fmt->i_height,
 610                               p_fmt->i_sar_num, p_fmt->i_sar_den );
 611
 612     /* */
 613     picture_t *p_picture = calloc( 1, sizeof(*p_picture) );
 614     if( !p_picture )
 615         return NULL;
 616
 617     if( p_resource )
 618     {
 619         if( picture_Setup( p_picture, fmt.i_chroma, fmt.i_width, fmt.i_height,
 620                            fmt.i_sar_num, fmt.i_sar_den ) )
 621         {
 622             free( p_picture );
 623             return NULL;
 624         }
 625         p_picture->p_sys = p_resource->p_sys;
 626
 627         for( int i = 0; i < p_picture->i_planes; i++ )
 628         {
 629             p_picture->p[i].p_pixels = p_resource->p[i].p_pixels;
 630             p_picture->p[i].i_lines  = p_resource->p[i].i_lines;
 631             p_picture->p[i].i_pitch  = p_resource->p[i].i_pitch;
 632         }
 633     }
 634     else
 635     {
 636         if( vout_AllocatePicture( (vlc_object_t *)NULL, p_picture,
 637                                   fmt.i_chroma, fmt.i_width, fmt.i_height,
 638                                   fmt.i_sar_num, fmt.i_sar_den ) )
 639         {
 640             free( p_picture );
 641             return NULL;
 642         }
 643     }
 644     /* */
 645     p_picture->format = fmt;
 646     p_picture->i_refcount = 1;
 647     p_picture->pf_release = PictureReleaseCallback;
 648     p_picture->i_status = RESERVED_PICTURE;
 649
 650     return p_picture;
 651 }
 652 picture_t *picture_NewFromFormat( const video_format_t *p_fmt )
 653 {
 654     return picture_NewFromResource( p_fmt, NULL );
 655 }
 656 picture_t *picture_New( vlc_fourcc_t i_chroma, int i_width, int i_height, int i_sar_num, int i_sar_den )
 657 {
 658     video_format_t fmt;
 659
 660     memset( &fmt, 0, sizeof(fmt) );
 661     video_format_Setup( &fmt, i_chroma, i_width, i_height,
 662                         i_sar_num, i_sar_den );
 663
 664     return picture_NewFromFormat( &fmt );
 665 }
 666
 667 /*****************************************************************************
 668  *
 669  *****************************************************************************/
 670 void picture_Delete( picture_t *p_picture )
 671 {
 672     assert( p_picture && p_picture->i_refcount == 0 );
 673     assert( p_picture->p_release_sys == NULL );
 674
 675     free( p_picture->p_q );
 676     free( p_picture->p_data_orig );
 677     free( p_picture->p_sys );
 678     free( p_picture );
 679 }
 680
 681 /*****************************************************************************
 682  *
 683  *****************************************************************************/
 684 void picture_CopyPixels( picture_t *p_dst, const picture_t *p_src )
 685 {
 686     int i;
 687
 688     for( i = 0; i < p_src->i_planes ; i++ )
 689         plane_CopyPixels( p_dst->p+i, p_src->p+i );
 690 }
 691
 692 void plane_CopyPixels( plane_t *p_dst, const plane_t *p_src )
 693 {
 694     const unsigned i_width  = __MIN( p_dst->i_visible_pitch,
 695                                      p_src->i_visible_pitch );
 696     const unsigned i_height = __MIN( p_dst->i_visible_lines,
 697                                      p_src->i_visible_lines );
 698
 699     if( p_src->i_pitch == p_dst->i_pitch )
 700     {
 701         /* There are margins, but with the same width : perfect ! */
 702         vlc_memcpy( p_dst->p_pixels, p_src->p_pixels,
 703                     p_src->i_pitch * i_height );
 704     }
 705     else
 706     {
 707         /* We need to proceed line by line */
 708         uint8_t *p_in = p_src->p_pixels;
 709         uint8_t *p_out = p_dst->p_pixels;
 710         int i_line;
 711
 712         assert( p_in );
 713         assert( p_out );
 714
 715         for( i_line = i_height; i_line--; )
 716         {
 717             vlc_memcpy( p_out, p_in, i_width );
 718             p_in += p_src->i_pitch;
 719             p_out += p_dst->i_pitch;
 720         }
 721     }
 722 }
 723
 724 /*****************************************************************************
 725  *
 726  *****************************************************************************/
 727 int picture_Export( vlc_object_t *p_obj,
 728                     block_t **pp_image,
 729                     video_format_t *p_fmt,
 730                     picture_t *p_picture,
 731                     vlc_fourcc_t i_format,
 732                     int i_override_width, int i_override_height )
 733 {
 734     /* */
 735     video_format_t fmt_in = p_picture->format;
 736     if( fmt_in.i_sar_num <= 0 || fmt_in.i_sar_den <= 0 )
 737     {
 738         fmt_in.i_sar_num =
 739         fmt_in.i_sar_den = 1;
 740     }
 741
 742     /* */
 743     video_format_t fmt_out;
 744     memset( &fmt_out, 0, sizeof(fmt_out) );
 745     fmt_out.i_sar_num =
 746     fmt_out.i_sar_den = 1;
 747     fmt_out.i_chroma  = i_format;
 748
 749     /* compute original width/height */
 750     unsigned int i_original_width;
 751     unsigned int i_original_height;
 752     if( fmt_in.i_sar_num >= fmt_in.i_sar_den )
 753     {
 754         i_original_width = fmt_in.i_width * fmt_in.i_sar_num / fmt_in.i_sar_den;
 755         i_original_height = fmt_in.i_height;
 756     }
 757     else
 758     {
 759         i_original_width =  fmt_in.i_width;
 760         i_original_height = fmt_in.i_height * fmt_in.i_sar_den / fmt_in.i_sar_num;
 761     }
 762
 763     /* */
 764     fmt_out.i_width  = ( i_override_width < 0 ) ?
 765                        i_original_width : i_override_width;
 766     fmt_out.i_height = ( i_override_height < 0 ) ?
 767                        i_original_height : i_override_height;
 768
 769     /* scale if only one direction is provided */
 770     if( fmt_out.i_height == 0 && fmt_out.i_width > 0 )
 771     {
 772         fmt_out.i_height = fmt_in.i_height * fmt_out.i_width
 773                      * fmt_in.i_sar_den / fmt_in.i_width / fmt_in.i_sar_num;
 774     }
 775     else if( fmt_out.i_width == 0 && fmt_out.i_height > 0 )
 776     {
 777         fmt_out.i_width  = fmt_in.i_width * fmt_out.i_height
 778                      * fmt_in.i_sar_num / fmt_in.i_height / fmt_in.i_sar_den;
 779     }
 780
 781     image_handler_t *p_image = image_HandlerCreate( p_obj );
 782
 783     block_t *p_block = image_Write( p_image, p_picture, &fmt_in, &fmt_out );
 784
 785     image_HandlerDelete( p_image );
 786
 787     if( !p_block )
 788         return VLC_EGENERIC;
 789
 790     p_block->i_pts =
 791     p_block->i_dts = p_picture->date;
 792
 793     if( p_fmt )
 794         *p_fmt = fmt_out;
 795     *pp_image = p_block;
 796
 797     return VLC_SUCCESS;
 798 }
 799