refbuf.c

AVS视频编解码器 能实现视频图像的高效率压缩 能在ＶＣ上高速运行

/*
***********************************************************************
* COPYRIGHT AND WARRANTY INFORMATION
*
* Copyright 2003, Advanced Audio Video Coding Standard, Part II
*
* DISCLAIMER OF WARRANTY
*
* These software programs are available to the users without any
* license fee or royalty on an "as is" basis. The AVS disclaims
* any and all warranties, whether express, implied, or statutory,
* including any implied warranties of merchantability or of fitness
* for a particular purpose. In no event shall the contributors or 
* the AVS be liable for any incidental, punitive, or consequential
* damages of any kind whatsoever arising from the use of this program.
*
* This disclaimer of warranty extends to the user of this program
* and user's customers, employees, agents, transferees, successors,
* and assigns.
*
* The AVS does not represent or warrant that the program furnished
* hereunder are free of infringement of any third-party patents.
* Commercial implementations of AVS, including shareware, may be
* subject to royalty fees to patent holders. Information regarding
* the AVS patent policy is available from the AVS Web site at
* http://www.avs.org.cn
*
* THIS IS NOT A GRANT OF PATENT RIGHTS - SEE THE AVS PATENT POLICY.
************************************************************************
*/

/*
*************************************************************************************
* File name: 
* Function: 
*
*************************************************************************************
*/

#include <stdio.h>
#include <stdlib.h>
#include <memory.h>
#include <assert.h>

#include "refbuf.h"

#define CACHELINESIZE 32

static pel_t line[16];

/*
*************************************************************************
* Function:Reference buffer write routines
* Input:
* Output:
* Return: 
* Attention:
*************************************************************************
*/

void PutPel_14 (pel_t **Pic, int y, int x, pel_t val)
{
  Pic [IMG_PAD_SIZE*4+y][IMG_PAD_SIZE*4+x] = val;
}

/*
*************************************************************************
* Function:Reference buffer read, Full pel
* Input:
* Output:
* Return: 
* Attention:
*************************************************************************
*/

pel_t *FastLineX (int dummy, pel_t* Pic, int y, int x)
{
  return Pic + y*img->width + x;
}

/*
*************************************************************************
* Function:
* Input:
* Output:
* Return: 
* Attention:
*************************************************************************
*/
pel_t *UMVLineX (int size, pel_t* Pic, int y, int x)
{
  int i, maxx;
  pel_t *Picy;

  Picy = Pic + max(0,min(img->height-1,y)) * img->width;

  if (x < 0)                            // Left edge
  {
    maxx = min(0,x+size);

    for (i = x; i < maxx; i++)
    {
      line[i-x] = Picy [0];             // Replicate left edge pixel
    }

    maxx = x+size;

    for (i = 0; i < maxx; i++)          // Copy non-edge pixels
      line[i-x] = Picy [i];
  }
  else if (x > img->width-size)         // Right edge
  {
    maxx = img->width;

    for (i = x; i < maxx; i++)
    {
      line[i-x] = Picy [i];             // Copy non-edge pixels
    }

    maxx = x+size;

    for (i = max(img->width,x); i < maxx; i++)
    {
      line[i-x] = Picy [img->width-1];  // Replicate right edge pixel
    }
  }
  else                                  // No edge
  {
    return Picy + x;
  }

  return line;
}

/*
*************************************************************************
* Function:Reference buffer, 1/4 pel
* Input:
* Output:
* Return: 
* Attention:
*************************************************************************
*/

pel_t UMVPelY_14 (pel_t **Pic, int y, int x)
{
  int width4  = ((img->width+2*IMG_PAD_SIZE-1)<<2);
  int height4 = ((img->height+2*IMG_PAD_SIZE-1)<<2);

  x = x + IMG_PAD_SIZE*4;
  y = y + IMG_PAD_SIZE*4;

  if (x < 0)
  {
    if (y < 0)
      return Pic [y&3][x&3];
    if (y > height4)
      return Pic [height4+(y&3)][x&3];
    return Pic [y][x&3];
  }

  if (x > width4)
  {
    if (y < 0)
      return Pic [y&3][width4+(x&3)];
    if (y > height4)
      return Pic [height4+(y&3)][width4+(x&3)];
    return Pic [y][width4+(x&3)];
  }

  if (y < 0)    // note: corner pixels were already processed
    return Pic [y&3][x];
  if (y > height4)
    return Pic [height4+(y&3)][x];

  return Pic [y][x];
}

pel_t FastPelY_14 (pel_t **Pic, int y, int x)
{
  return Pic [IMG_PAD_SIZE*4+y][IMG_PAD_SIZE*4+x];
}