如何将16位RGB帧缓冲区转换为可视格式？ [英] how to convert 16-bit RGB Frame Buffer to a viewable format?

问题描述

我正在使用一个设备上的其他人的代码，可以将图像放在 / dev / fb / 0 中，并显示在视频中或通过网络到客户端应用程序。

我无法访问客户端应用程序的旧源，但我了解以下有关数据的信息：

• 720x480


• 16位


• RGB（我不知道如果是5,5,5或5,6,5）


• RAW（没有标题）


• cat -able to / dev / fb / 0


• 675kb






如何给这个标题或将其转换为JPEG，BMP或RAW类型，然后我可以在桌面应用程序中查看？





最终，我希望它在浏览器中是jpeg和可见的，但是我现在可以看到的任何东西现在都可以工作。





成功





（见下面的评论）

  ffmpeg \ 
 -vcodec rawvideo \ 
 -f rawvideo \ 
 -pix_fmt rgb565 \ 
 -s 720x480 \ 
 -i in-buffer.raw \ 
 \ 
 -f image2 \ 
 -vcodec mjpeg \\ \\ 
 out-buffer.jpg 
  







• github.com/coolaj86/image-examples


• image-examples / scripts / rgbtools-torgb
$ b $ a>





尝试失败





没有颜色，垂直挤压：

  rawtoppm -rgb -interpixel 720 480 fb.raw> fb.ppm 
  

显示图像，但条纹和垂直和不良颜色压缩：

  rawtoppm -rgb -interrow 720 480 fb.raw> fb.ppm 
  

类似于上述

  convert -depth 16 -size 720x480 frame_buffer.rgb fb.jpeg 
  








维护在 https://github.com/coolaj86/image-examples

  #include< stdio.h> 
 
 int main（int argc，char * argv []）{
 
 FILE * infile; // fb.raw 
 FILE * outfile; // fb.ppm 
 unsigned char red，green，blue; // 8位每个
无符号短像素; //每像素16位
 unsigned int maxval; // max color val 
 unsigned short width，height; 
 size_t i; 
 
 infile = fopen（./ fb.raw，r）; 
 outfile = fopen（./ fb.ppm，wb）; 
 width = 720; 
 height = 480; 
 maxval = 255; 
 
 // P3  -  PPMplainheader 
 fprintf（outfile，P3\\\
＃create with rgb2ppm\\\
％d％d\\\
％d\\\
 ，width，height，maxval）; （i = 0; i< width * height; i + = 1）{
 fread（&像素，sizeof（无符号短），1，infile）; 
 
 
 
 red =（无符号短）（（像素& 0xF800）>> 11）; // 5 
 green =（无符号短）（（像素& 0x07E0）>> 5）; // 6 
 blue =（unsigned short）（pixel& 0x001F）; // 5 
 
 //增加强度
 red = red<< 3; 
 green = green<<< 2; 
 blue = blue<<< 3; 
 
 // P6 binary 
 // fwrite（&（red | green | blue），1，sizeof（unsigned short），outfile）; 
 
 // P3plain
 fprintf（outfile，％d％d％d\\\
，red，green，blue）; 
} 
} 
  




I'm working with someone else's code on a device which can put an image to /dev/fb/0 and show up on video out or send it over the network to a client application.

I don't have access to the old source for the client app, but I know the following about the data:

• 720x480
• 16-bit
• RGB (I'm no sure if it's 5,5,5 or 5,6,5)
• RAW (no headers whatsoever)
• cat-able to /dev/fb/0
• 675kb

How can I give this a header or convert it to JPEG, BMP, or a RAW type that I could then view in a desktop application?

Ultimately, I want it to be jpeg and viewable in a browser, but anything I can see with my eyes will work for now.

Success

(see the comments below)

ffmpeg \
  -vcodec rawvideo \
  -f rawvideo \
  -pix_fmt rgb565 \
  -s 720x480 \
  -i in-buffer.raw \
  \
  -f image2 \
  -vcodec mjpeg \
  out-buffer.jpg

• github.com/coolaj86/image-examples
• image-examples/scripts/rgbtools-torgb
• image-examples/scripts/rgbtools-fromrgb

Failed Attempts

Shows the image three times widthwise with almost no color, and squashed vertically:

rawtoppm -rgb -interpixel 720 480 fb.raw > fb.ppm

Shows the image, but with streaks and squashed vertically and bad color:

rawtoppm -rgb -interrow 720 480 fb.raw > fb.ppm

Similar to the above

convert -depth 16 -size 720x480 frame_buffer.rgb fb.jpeg

解决方案

rgb to ppm: Just season to taste!

maintained at https://github.com/coolaj86/image-examples

#include <stdio.h>

int main(int argc, char* argv[]) {

  FILE* infile; // fb.raw
  FILE* outfile; // fb.ppm
  unsigned char red, green, blue; // 8-bits each
  unsigned short pixel; // 16-bits per pixel
  unsigned int maxval; // max color val
  unsigned short width, height;
  size_t i;

  infile = fopen("./fb.raw", "r");
  outfile = fopen("./fb.ppm", "wb");
  width = 720;
  height = 480;
  maxval = 255;

  // P3 - PPM "plain" header
  fprintf(outfile, "P3\n#created with rgb2ppm\n%d %d\n%d\n", width, height, maxval);

  for (i = 0; i < width * height; i += 1) {
      fread(&pixel, sizeof(unsigned short), 1, infile);

      red = (unsigned short)((pixel & 0xF800) >> 11);  // 5
      green = (unsigned short)((pixel & 0x07E0) >> 5); // 6
      blue = (unsigned short)(pixel & 0x001F);         // 5

      // Increase intensity
      red = red << 3;
      green = green << 2;
      blue = blue << 3;

    // P6 binary
    //fwrite(&(red | green | blue), 1, sizeof(unsigned short), outfile);

    // P3 "plain"
    fprintf(outfile, "%d %d %d\n", red, green, blue);
  }
}

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