bmptorgb16.c

达芬奇DM6446平台音频、视频

#include <stdio.h>

#define RGB16(red, green, blue) ( ((red >> 3) << 11) | ((green >> 2) << 5) | (blue >> 3))
#define MAX_OSD_WIDTH 720     // Max Davinci OSD width
#define MAX_OSD_HEIGHT 576    // Max Davinci OSD height (for PAL support)
#define MAX_OSD_SIZE MAX_OSD_WIDTH*MAX_OSD_HEIGHT  
#define NTSC_OSD_WIDTH  720
#define NTSC_OSD_HEIGHT 480

int main(int argc, char *argv[])
{
   short  osdData[MAX_OSD_SIZE]; 
   FILE   *rgb24file;
   FILE   *rgb16file;
   char   red, green, blue;
   long   fileSize;
   int    x, y; 
   int    width=NTSC_OSD_WIDTH, height=NTSC_OSD_HEIGHT; //Default values

   if (argc < 2)
   {
     printf("Usage: %s filename [width][height]\n", argv[0]);
     return -1;
   }
   else if ((argc > 2) && (argc != 4))
   {
      printf("Must specify both width and height or neither\n");
      printf("Usage: %s filename [width][height]\n", argv[0]);
      return -1;
   }
   else if ((argc == 4) && (atoi(argv[2]) > MAX_OSD_WIDTH))
   {
      printf("width cannot exceed %d  pixels\n", MAX_OSD_WIDTH);
      return -1;
   }
   else if ((argc==4) && (atoi(argv[3]) > MAX_OSD_HEIGHT))
   {
      printf("height cannot exceed %d pixels\n", MAX_OSD_HEIGHT);
      return -1;
   }
   else if (argc==4)
   {
      //Valid width and Height were entered; therefore override defaults
      width = atoi(argv[2]);
      height = atoi(argv[3]);
   }
    
   printf("Preparing to convert %s (%d x %d)....\n", argv[1], width, height);   

   // Open file in read-binary mode
   rgb24file = fopen(argv[1], "rb");
  
   if (rgb24file == NULL)
   {
      printf("could not find file %s \n", argv[1]);
      return -1;
   }
 
   // Get size of file
   fseek(rgb24file, 0, SEEK_END);
   fileSize = ftell(rgb24file);
   fseek(rgb24file, 0, SEEK_SET);
   printf("size %d\n", fileSize);
  
   //Skip BMP header information 
   fseek(rgb24file, 54, SEEK_SET);
   fileSize = fileSize - 54;
 
   //Ensure file size does not exceed Max supported OSD size
   if (fileSize > (MAX_OSD_SIZE*3))
   {
      printf("This file is too large, maximum supported size is 720x576x3\n");
   }
   else if (((fileSize % 3) !=0)|| (fileSize != (width*height*3))) 
   {
      printf("this file does not have the size expected \n");
   }
   else
   {
      for( x=0; x < (width*height); ++x)
      {
         fread(&blue, sizeof(char), 1, rgb24file);
         fread(&green, sizeof(char), 1, rgb24file);
         fread(&red, sizeof(char), 1, rgb24file);

         osdData[x] = RGB16(red, green, blue);
      }
     
      // Open file in read-binary mode
      rgb16file = fopen("osd.r16", "wb");
      for (y= height -1;  y >=0; --y)
      {
         for (x=0; x < width; ++x)
         {
            fwrite(&osdData[(width*y) + x], sizeof(short), 1, rgb16file);
         }
      }
      fclose(rgb16file);
     
   }

   fclose(rgb24file);
   return;
}