map = AudioMapping (ch, 2);
float const overall_gain = 2 / (4 + sqrt(2));
float const minus_3dB = 1 / sqrt(2);
- map.set (dcp::LEFT, 0, overall_gain);
- map.set (dcp::RIGHT, 1, overall_gain);
- map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
- map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
- map.set (dcp::LS, 0, overall_gain);
- map.set (dcp::RS, 1, overall_gain);
+ if (ch == 2) {
+ map.set (dcp::LEFT, 0, 1);
+ map.set (dcp::RIGHT, 1, 1);
+ } else if (ch == 4) {
+ map.set (dcp::LEFT, 0, overall_gain);
+ map.set (dcp::RIGHT, 1, overall_gain);
+ map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
+ map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
+ map.set (dcp::LS, 0, overall_gain);
+ } else if (ch >= 6) {
+ map.set (dcp::LEFT, 0, overall_gain);
+ map.set (dcp::RIGHT, 1, overall_gain);
+ map.set (dcp::CENTRE, 0, overall_gain * minus_3dB);
+ map.set (dcp::CENTRE, 1, overall_gain * minus_3dB);
+ map.set (dcp::LS, 0, overall_gain);
+ map.set (dcp::RS, 1, overall_gain);
+ }
} else {
_output_audio_channels = ch;
map = AudioMapping (ch, ch);