src/video_output/vout_pictures.h

   1 /*****************************************************************************
   2  * vout_pictures.h : picture management definitions
   3  *****************************************************************************
   4  * Copyright (C) 2002-2004 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Samuel Hocevar <sam@zoy.org>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License as published by
  11  * the Free Software Foundation; either version 2 of the License, or
  12  * (at your option) any later version.
  13  *
  14  * This program is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  * GNU General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU General Public License
  20  * along with this program; if not, write to the Free Software
  21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
  22  *****************************************************************************/
  23
  24 /*****************************************************************************
  25  * Fourcc definitions that we can handle internally
  26  *****************************************************************************/
  27
  28 /* Alignment of critical dynamic data structure
  29  *
  30  * Not all platforms support memalign so we provide a vlc_memalign wrapper
  31  * void *vlc_memalign( size_t align, size_t size, void **pp_orig )
  32  * *pp_orig is the pointer that has to be freed afterwards.
  33  */
  34 static inline
  35 void *vlc_memalign (void **pp, size_t align, size_t size)
  36 {
  37 #if defined (HAVE_POSIX_MEMALIGN)
  38     return posix_memalign (pp, align, size) ? NULL : *pp;
  39 #elif defined (HAVE_MEMALIGN)
  40     return *pp = memalign (align, size);
  41 #else
  42     unsigned char *ptr;
  43
  44     if (align < 1)
  45         return NULL;
  46
  47     align--;
  48     ptr = malloc (size + align);
  49     if (ptr == NULL)
  50         return NULL;
  51
  52     *pp = ptr;
  53     ptr += align;
  54     return (void *)(((uintptr_t)ptr) & ~align);
  55 #endif
  56 }
  57