text: /*
   * This file is part of Libav.
   *
   * Libav is free software; you can redistribute it and/or
   * modify it under the terms of the GNU Lesser General Public
   * License as published by the Free Software Foundation; either
   * version 2.1 of the License, or (at your option) any later version.
   *
   * Libav is distributed in the hope that it will be useful,
   * but WITHOUT ANY WARRANTY; without even the implied warranty of
   * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   * Lesser General Public License for more details.
   *
   * You should have received a copy of the GNU Lesser General Public
   * License along with Libav; if not, write to the Free Software
   * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
   */
  
  #include <stddef.h>
  #include <stdint.h>
  
  #include "libavutil/cpu.h"
  #include "libavutil/error.h"
  #include "libavutil/imgutils.h"
  #include "libavutil/imgutils_internal.h"
  #include "libavutil/internal.h"
  
  #include "cpu.h"
  
  void ff_image_copy_plane_uc_from_sse4(uint8_t *dst, ptrdiff_t dst_linesize,
                                        const uint8_t *src, ptrdiff_t src_linesize,
                                        ptrdiff_t bytewidth, int height);
  
  int ff_image_copy_plane_uc_from_x86(uint8_t       *dst, ptrdiff_t dst_linesize,
                                      const uint8_t *src, ptrdiff_t src_linesize,
                                      ptrdiff_t bytewidth, int height)
  {
      int cpu_flags = av_get_cpu_flags();
      ptrdiff_t bw_aligned = FFALIGN(bytewidth, 64);
  
      if (EXTERNAL_SSE4(cpu_flags) &&
          bw_aligned <= dst_linesize && bw_aligned <= src_linesize)
          ff_image_copy_plane_uc_from_sse4(dst, dst_linesize, src, src_linesize,
                                           bw_aligned, height);
      else
          return AVERROR(ENOSYS);
  
      return 0;
  }
  