void copy_and_trunc()

in src/cubeb_mixer.cpp [489:521]

• 28 lines of code
• 7 McCabe index (conditional complexity)

  void copy_and_trunc(size_t frames, const T * input_buffer,
                      T * output_buffer) const
  {
    if (_context._in_ch_count <= _context._out_ch_count) {
      // Not enough channels to copy, fill the gaps with silence.
      if (_context._in_ch_count == 1 && _context._out_ch_count >= 2) {
        // Special case for upmixing mono input to stereo and more. We will
        // duplicate the mono channel to the first two channels. On most system,
        // the first two channels are for left and right. It is commonly
        // expected that mono will on both left+right channels
        for (uint32_t i = 0; i < frames; i++) {
          output_buffer[0] = output_buffer[1] = *input_buffer;
          PodZero(output_buffer + 2, _context._out_ch_count - 2);
          output_buffer += _context._out_ch_count;
          input_buffer++;
        }
        return;
      }
      for (uint32_t i = 0; i < frames; i++) {
        PodCopy(output_buffer, input_buffer, _context._in_ch_count);
        output_buffer += _context._in_ch_count;
        input_buffer += _context._in_ch_count;
        PodZero(output_buffer, _context._out_ch_count - _context._in_ch_count);
        output_buffer += _context._out_ch_count - _context._in_ch_count;
      }
    } else {
      for (uint32_t i = 0; i < frames; i++) {
        PodCopy(output_buffer, input_buffer, _context._out_ch_count);
        output_buffer += _context._out_ch_count;
        input_buffer += _context._in_ch_count;
      }
    }
  }