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osxaudio: support hidden devices

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macOS features hidden devices. These are devices that will
not be shown in the macOS UIs and that cannot be retrieved
without having the specific UID of the hidden device. There
are cases when you might want to have a hidden device, for example
when having a virtual speaker that forwards the data to a virtual
hidden input device from which you can then grab the audio.
The blackhole project supports these hidden devices and
this patch provides a way that if the device id is a hidden
device it will use it instead of check the hardware list of devices
to understand if the device is valid.

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2251>
This commit is contained in:
Ignacio Casal Quinteiro 2022-03-30 12:59:46 +02:00 committed by GStreamer Marge Bot
parent 243f8e8882
commit caa5972abd
1 changed files with 26 additions and 0 deletions
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26
subprojects/gst-plugins-good/sys/osxaudio/gstosxcoreaudiohal.c
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@ -138,6 +138,25 @@ _audio_device_is_alive (AudioDeviceID device_id, gboolean output)
return alive;
}
static inline gboolean
_audio_device_is_hidden (AudioDeviceID device_id)
{
OSStatus status = noErr;
UInt32 hidden = FALSE;
UInt32 property_size = sizeof (hidden);
AudioObjectPropertyAddress property_address;
property_address.mSelector = kAudioDevicePropertyIsHidden;
status = AudioObjectGetPropertyData (device_id,
&property_address, 0, NULL, &property_size, &hidden);
if (status != noErr) {
return FALSE;
}
return hidden;
}
static inline guint
_audio_device_get_latency (AudioDeviceID device_id)
{
@ -1202,6 +1221,13 @@ gst_core_audio_select_device_impl (GstCoreAudio * core_audio)
GST_ERROR ("No device of required type available");
res = FALSE;
}
} else if (_audio_device_is_hidden (device_id)) {
if (_audio_device_is_alive (device_id, output)) {
res = TRUE;
} else {
GST_ERROR ("Requested hidden device not usable");
res = FALSE;
}
} else {
AudioDeviceID *devices = NULL;
gint i, ndevices = 0;