c++ - How to get pixel bit count using PixelFormat in libav -

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Is there a way to get a bit count of pixels from the codecContext.pix_fmt type PixelFormat? I use it manually: 

  switch (OUT_IMAGE_FORMAT) {case PIX_FMT_RGB24: pVideoInfo-> bmiHeader.biBitCount = 24; do something(); break; // etc}   
 But it requires manual updates every time, when libav will add or remove some pixel formats. Or if I need to add some pixel formats that were not previously supported.  
 PS I need to fill CMediaType for the DirectShow filter, so bits_per_raw_sample is not suitable because it is internal use as I know.   
 
 
 Try to use  
  #include "libavutil / pixdesc .h "pVideoInfo-> bmiHeader.biBitCount = av_get_bits_per_pixel (and av_pix_fmt_descriptors [OUT_IMAGE_FORMAT]);

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