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ALSA: allow to select clock-source when using multiple devices

This commit is contained in:
Robin Gareus 2021-01-24 18:10:35 +01:00
parent cd524f70dc
commit f0a89c4f1d
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 15 additions and 11 deletions
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26
libs/backends/alsa/alsa_audiobackend.cc
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@ -828,17 +828,21 @@ AlsaAudioBackend::_start (bool for_latency_measurement)
if (_input_audio_device != _output_audio_device) {
if (_input_audio_device != get_standard_device_name(DeviceNone) && _output_audio_device != get_standard_device_name(DeviceNone)) {
#if 0 /* ideally we'd resample output ...*/
slave_device = _output_audio_device;
_output_audio_device = get_standard_device_name(DeviceNone);
slave_duplex = AudioSlave::HalfDuplexOut;
#else
/*.. but input is usually a cheap USB device, and keeping
* output does auto-connect master-out to the main device. */
slave_device = _input_audio_device;
_input_audio_device = get_standard_device_name(DeviceNone);
slave_duplex = AudioSlave::HalfDuplexIn;
#endif
/* Different devices for In + Out.
* Ideally use input as clock source, and resample output.
* But when using separate devices, input is usually one (or more)
* cheap USB mic. Also keeping output device as "main",
* retains master-out connection.
*/
if (getenv ("ARDOUR_ALSA_CLK")) {
slave_device = _output_audio_device;
_output_audio_device = get_standard_device_name(DeviceNone);
slave_duplex = AudioSlave::HalfDuplexOut;
} else {
slave_device = _input_audio_device;
_input_audio_device = get_standard_device_name(DeviceNone);
slave_duplex = AudioSlave::HalfDuplexIn;
}
}
if (_input_audio_device != get_standard_device_name(DeviceNone)) {
get_alsa_audio_device_names(devices, HalfDuplexIn);