mp4_recon.c

VC++视频开发实例集锦(包括“远程视频监控”"语音识别系统"等13个经典例子)

#include "mp4_vars.h"

#include "basic_prediction.h"
#include "timer.h"
/**
 *
**/

void recon_comp (unsigned char *src, unsigned char *dst, 
								int lx, int w, int h, int x, 
								int y, int dx, int dy, int chroma)
{
  int xint, xh, yint, yh;
  unsigned char *s, *d;

  xint = dx >> 1;
  xh = dx & 1;
  yint = dy >> 1;
  yh = dy & 1;


  s = src + lx * (y + yint) + x + xint;
  d = dst + lx * y + x;

	{
		int mc_driver = ((w!=8)<<3) | (mp4_state->hdr.rounding_type<<2) | (yh<<1) | (xh);
		switch (mc_driver)
		{

			case 0: case 4:
 			  CopyBlock(s, d, lx);
			  break;
			case 1:
				CopyBlockHor(s, d, lx);
				break;
			case 2:
				CopyBlockVer(s, d, lx);
				break;
			case 3:
				CopyBlockHorVer(s, d, lx);
				break;

			case 5:
				CopyBlockHorRound(s, d, lx);
				break;
			case 6:
				CopyBlockVerRound(s, d, lx);
				break;
			case 7:
				CopyBlockHorVerRound(s, d, lx);
				break;

			case 8: case 12:
				CopyMBlock(s, d, lx);
				break;
			case 9:
				CopyMBlockHor(s, d, lx);
				break;
			case 10:
				CopyMBlockVer(s, d, lx);
				break;
			case 11:
				CopyMBlockHorVer(s, d, lx);
				break;

			case 13:
				CopyMBlockHorRound(s, d, lx);
				break;
			case 14:
				CopyMBlockVerRound(s, d, lx);
				break;
			case 15:
				CopyMBlockHorVerRound(s, d, lx);
				break;
		}
	}
}


/***/

void reconstruct (int bx, int by, int mode)
{
  int w, h, lx, dx, dy, xp, yp, comp, sum;
  int x, y, px, py;
  unsigned char * src[3];
  start_timer();
	
  x = bx + 1;
  y = by + 1;

  lx = mp4_state->coded_picture_width;

  src[0] = frame_for[0];
  src[1] = frame_for[1];
  src[2] = frame_for[2];

	w = 8;
	h = 8;

	px = bx << 4;
	py = by << 4;
	if (mode == INTER4V)
	{
		for (comp = 0; comp < 4; comp++)
		{
			dx = mp4_state->MV[0][comp][y][x];
			dy = mp4_state->MV[1][comp][y][x];
			
			xp = px + ((comp & 1) << 3);
			yp = py + ((comp & 2) << 2);

			recon_comp (src[0], frame_ref[0], lx, w, h, xp, yp, dx, dy, 0);
		}
	} else
	{
		dx = mp4_state->MV[0][0][y][x];
		dy = mp4_state->MV[1][0][y][x];

		recon_comp (src[0], frame_ref[0], lx, w << 1, h << 1, px, py, dx, dy, 0);
	}
	

	px = bx << 3;
	py = by << 3;
	if (mode == INTER4V)
	{
		sum = mp4_state->MV[0][0][y][x] + mp4_state->MV[0][1][y][x] + 
					mp4_state->MV[0][2][y][x] + mp4_state->MV[0][3][y][x];
		if (sum == 0) 
			dx = 0;
		else
			dx = sign (sum) * (mp4_tables->roundtab[abs (sum) % 16] + (abs (sum) / 16) * 2);
		
		sum = mp4_state->MV[1][0][y][x] + mp4_state->MV[1][1][y][x] + 
					mp4_state->MV[1][2][y][x] + mp4_state->MV[1][3][y][x];
		if (sum == 0)
			dy = 0;
		else
			dy = sign (sum) * (mp4_tables->roundtab[abs (sum) % 16] + (abs (sum) / 16) * 2);
		
	} else
	{
		dx = mp4_state->MV[0][0][y][x];
		dy = mp4_state->MV[1][0][y][x];


		dx = (dx % 4 == 0 ? dx >> 1 : (dx >> 1) | 1);
		dy = (dy % 4 == 0 ? dy >> 1 : (dy >> 1) | 1);
	}
	lx >>= 1;

	recon_comp (src[1], frame_ref[1], lx, w, h, px, py, dx, dy, 1);
	recon_comp (src[2], frame_ref[2], lx, w, h, px, py, dx, dy, 2);

	stop_recon_timer();
}

/***/