H261 decoder
Dependencies: SDL_lib2 SX1276Lib mbed
functions_dec.h
- Committer:
- miruga27
- Date:
- 2016-09-22
- Revision:
- 0:5bd441b8ab2d
- Child:
- 1:1ed97958d0f3
File content as of revision 0:5bd441b8ab2d:
/* * functions_dec.h * * Created on: 5/7/2016 * Author: Miguel Ruiz García */ #include <SDL.h> //#include <windows.h> #include <stdio.h> #include <math.h> #ifndef FUNCTIONS_DEC_H_ #define FUNCTIONS_DEC_H_ #endif /* FUNCTIONS_DEC_H_ */ #define PI 3.1415952 #define WIDTH 320 #define HEIGHT 8 #define DEPTH 32 #define RAIZ2 1.414214 #define PI16 0.19635 void IDCT(int matrix[8][8][3],short int f[HEIGHT][WIDTH][3],int p_fil,int p_col){ int i=0,j=0,u,v; float cu=1,cv=1; int linea,bpp; Uint8 *pixel; for(i=p_fil;i<8+p_fil;i++){ for(j=p_col;j<8+p_col;j++){ f[i][j][0]=0; f[i][j][1]=0; f[i][j][2]=0; float dato=0.0; float dato2=0.0; float dato3=0.0; for(u=0;u<8;u++){ for(v=0;v<8;v++){ if(u==0){ cu=RAIZ2/2; } else cu=1.0; if(v==0){ cv=RAIZ2/2; } else cv=1.0; dato=(float)(cos((float)((((+j-p_col)<<1)+1)*v*PI16))); dato2=(float)(cos((float)((((i-p_fil)<<1)+1)*u*PI16))); dato3=(float)((cu*cv)/4); f[i][j][0]+=(short int)(dato*dato2*(matrix[u][v][0]))*dato3;//crominancia f[i][j][1]+=(short int)(dato*dato2*(matrix[u][v][1]))*dato3;//crominancia f[i][j][2]+=(short int)(dato*dato2*(matrix[u][v][2]))*dato3;//luminancia } } } } } void yuv_to_rgb(short int f[HEIGHT][WIDTH][3]){ int i=0,j=0; float r=0.0,g=0.0,b=0.0; char cad[180]; int cont; for(i=0;i<HEIGHT;i++){ for(j=0;j<WIDTH;j++){ b=(f[i][j][2]-16)*1.164+(f[i][j][1]-128)*2.017; g=(f[i][j][2]-16)*1.164-(f[i][j][0]-128)*0.813-(f[i][j][1]-128)*0.392; r=((f[i][j][2])-16)*1.164+((f[i][j][0])-128)*1.596; /* r=(*(pixel+2)-16)*1.164+(*(pixel)-128)*1.793; g=(*(pixel+2)-16)*1.164-(*(pixel+1)-128)*0.213-(*(pixel)-128)*0.533; b=(*(pixel+2)-16)*1.164+((*(pixel+1))-128)*2.112;*/ if(r>255) r=255; if(g>255) g=255; if(b>255) b=255; if(r<0) r=0; if(g<0) g=0; if(b<0) b=0; f[i][j][2]=(short int)r; f[i][j][1]=(short int)g; f[i][j][0]=(short int)b; } } } void zig_zag_dec(short int f[HEIGHT][WIDTH][3],short int *matrix){ int i=0,p_x=0,p_y=0; int flag=0; for(i=0;i<HEIGHT*WIDTH*3;i+=3){ f[p_y][p_x][0]= *(matrix+i); f[p_y][p_x][1]= *(matrix+i+1); f[p_y][p_x][2]= *(matrix+i+2); if(flag==0){ p_x++,p_y--; if(p_y<0){ p_y=0; flag=1; } if(p_x>WIDTH-1){ p_x=WIDTH-1; p_y+=2; flag=1; } } else{ p_x--,p_y++; if(p_y>HEIGHT-1){ p_y=HEIGHT-1; p_x+=2; flag=0; } if(p_x<0){ p_x=0; flag=0; } } } } void cuantizador_dec(short int mat[HEIGHT][WIDTH][3]){ short int luma[8][8]={{16,11,10,16,24,40,51,61}, {12,12,14,19,26,58,60,55}, {14,13,16,24,40,57,69,56}, {14,17,22,29,51,87,80,62}, {18,22,37,56,68,109,103,77}, {24,35,55,64,81,104,113,92}, {49,64,78,87,103,121,120,101}, {72,92,95,98,112,100,103,99}}; short int croma[8][8]={{17,18,24,47,99,99,99,99}, {18,21,26,66,99,99,99,99}, {24,26,56,99,99,99,99,99}, {47,66,99,99,99,99,99,99}, {99,99,99,99,99,99,99,99}, {99,99,99,99,99,99,99,99}, {99,99,99,99,99,99,99,99}, {99,99,99,99,99,99,99,99}}; int i=0,x_block,y_block,j; for(i=0;i<HEIGHT;i+=8){ for(j=0;j<WIDTH;j+=8) for(x_block=i; x_block<i+8 ;x_block++){ for(y_block=j; y_block<j+8 ;y_block++){ mat[x_block][y_block][2]*=luma[x_block-i][y_block-j]; mat[x_block][y_block][1]*=croma[x_block-i][y_block-j]; mat[x_block][y_block][0]*=croma[x_block-i][y_block-j]; } } } }