The device may need to stop because it is about to restart with new
settings.
e.g. When the DemoRunner is started while the microphone is set to
44.1KHz and the speakers are set to 48KHz in Audio MIDI Settings, one of
the devices must be restarted in order for the AudioDeviceCombiner to
work. In this situation, stopping one device shouldn't count as an
error, because the device will be started again with new, compatible,
settings.
Previously, whenever the output device sample time changed from
'invalid' to 'valid', the AudioBuffer fifo in the AudioIODeviceCombiner
was cleared. This caused a data race, since the clear operation was not
mutually exclusive with writes from the input device.
This change causes the AudioIODeviceCombiner to keep track of the
timestamp of the first input device callback after the output device is
invalidated. The output device is unable to read from the fifo until its
timestamp exceeds the stored input device callback timestamp.
Previously, JUCE_ANDROID_REALTIME_THREAD_AVAILABLE sometimes remained
unset, even though JUCE_USE_ANDROID_OBOE was set to its default value.
This is because in this case, JUCE_USE_ANDROID_OBOE is only defined in
juce_audio_basics.h, so it is not visible when compiling juce_core.cpp.
Prior to this commit it was not possible to deactivate the first few
channels of an audio device. If say channel 5 was active in the
requested configuration then all channels up to 5 would be active as
well regardless of the provided activation pattern.
Until this commit CoreAudioIODevice could report inconsistent information in its
getActiveOutputChannels() and getOutputChannelNames() functions, and for
inputs as well. The reason for this was that a sudden configuration change
would immediately be reflected by the CoreAudioInternal::Stream::chanNames
member because those are read in the Stream's constructor. The activeChan
member would however just store stale values, until the Stream was recreated
later during device reopen.
This issue could lead to the AudioPluginHost crashing when opening a
Bluetooth headset.
