[Bug 759558] New: osxaudiosrc/osaudiosink uses non-unique identifiers as device ID

[GStreamer (GNOME Bugzilla)]

https://bugzilla.gnome.org/show_bug.cgi?id=759558

            Bug ID: 759558
           Summary: osxaudiosrc/osaudiosink uses non-unique identifiers as
                    device ID
    Classification: Platform
           Product: GStreamer
           Version: 1.6.1
                OS: Mac OS
            Status: NEW
          Severity: normal
          Priority: Normal
         Component: gst-plugins-good
          Assignee: gstreamer-bugs at lists.freedesktop.org
          Reporter: marcin at saepia.net
        QA Contact: gstreamer-bugs at lists.freedesktop.org
     GNOME version: ---

It seems that current version of osxaudiosrc/osxaudiosink handles "device"
parameter in a way that may be ambiguous in some setups.

It expects that device ID that is passed is a numeric ID, such as obtained by
running "say -a ?". This is however, inaccurate, as such device ID is not Core
Audio UNIQUE identifier.

In some setups that's fine, for instance my setup is like that

$ say -a ?
   50 Built-in Output
   60 Z-10 USB Speaker

However, depending to which USB port I plug my USB Speaker I get this UID from
CoreAudio:

AppleUSBAudioEngine:Logitech:Z-10 USB Speaker:fd120000:1

or this

AppleUSBAudioEngine:Logitech:Z-10 USB Speaker:fa130000:1

(this is the code used to query)

CFStringRef     uid;
propertySize = sizeof(uid);
deviceAddress.mSelector = kAudioDevicePropertyDeviceUID;
deviceAddress.mScope = kAudioObjectPropertyScopeGlobal;
deviceAddress.mElement = kAudioObjectPropertyElementMaster;
if(AudioObjectGetPropertyData(deviceIDs[idx], &deviceAddress, 0, NULL,
&propertySize, &uid) == noErr) {
 ...
}

In some setups, especially in pro audio/broadcasting environments it may be
necessary to use very precise reference to avoid issues if two devices of the
same type are plugged in.

To avoid API break, I suggest adding a boolean parameter "device-is-uid" that
will indicate whether interpret "device" like now or with exact uid, or another
string parameter "uid" that can be used in exchange of "device".

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