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