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osxaudio: Invalidate cached caps on format change

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Listen for changes in hardware stream format and channel layout, and
invalidate cached caps (since they contain the preferred caps).

https://bugzilla.gnome.org/show_bug.cgi?id=743758
This commit is contained in:
Ilya Konstantinov 2015-03-12 12:15:12 +02:00 committed by Arun Raghavan
parent 0e5d698c6f
commit a8b2666aa7
1 changed files with 60 additions and 0 deletions
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60
sys/osxaudio/gstosxcoreaudio.c
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@ -55,6 +55,43 @@ gst_core_audio_init (GstCoreAudio * core_audio)
#endif
}
static gboolean
_is_outer_scope (AudioUnitScope scope, AudioUnitElement element)
{
return
(scope == kAudioUnitScope_Input && element == 1) ||
(scope == kAudioUnitScope_Output && element == 0);
}
static void
_audio_unit_property_listener (void *inRefCon, AudioUnit inUnit,
AudioUnitPropertyID inID, AudioUnitScope inScope,
AudioUnitElement inElement)
{
GstCoreAudio *core_audio;
core_audio = GST_CORE_AUDIO (inRefCon);
g_assert (inUnit == core_audio->audiounit);
switch (inID) {
case kAudioUnitProperty_AudioChannelLayout:
case kAudioUnitProperty_StreamFormat:
if (_is_outer_scope (inScope, inElement)) {
/* We don't push gst_event_new_caps here (for src),
* nor gst_event_new_reconfigure (for sink), since Core Audio continues
* to happily function with the old format, doing conversion/resampling
* as needed.
* This merely "refreshes" our PREFERRED caps. */
/* protect against cached_caps going away */
GST_OBJECT_LOCK (core_audio->osxbuf);
gst_caps_replace (&core_audio->cached_caps, NULL);
GST_OBJECT_UNLOCK (core_audio->osxbuf);
}
break;
}
}
/**************************
* Public API *
*************************/
@ -83,6 +120,13 @@ gst_core_audio_close (GstCoreAudio * core_audio)
return FALSE;
}
AudioUnitRemovePropertyListenerWithUserData (core_audio->audiounit,
kAudioUnitProperty_AudioChannelLayout, _audio_unit_property_listener,
core_audio);
AudioUnitRemovePropertyListenerWithUserData (core_audio->audiounit,
kAudioUnitProperty_StreamFormat, _audio_unit_property_listener,
core_audio);
/* core_audio->osxbuf is already locked at this point */
gst_caps_replace (&core_audio->cached_caps, NULL);
@ -99,6 +143,22 @@ gst_core_audio_open (GstCoreAudio * core_audio)
if (!gst_core_audio_open_impl (core_audio))
return FALSE;
/* Add property listener */
status = AudioUnitAddPropertyListener (core_audio->audiounit,
kAudioUnitProperty_AudioChannelLayout, _audio_unit_property_listener,
core_audio);
if (status != noErr) {
GST_ERROR_OBJECT (core_audio, "Failed to add audio channel layout property "
"listener for AudioUnit: %d", (int) status);
}
status = AudioUnitAddPropertyListener (core_audio->audiounit,
kAudioUnitProperty_StreamFormat, _audio_unit_property_listener,
core_audio);
if (status != noErr) {
GST_ERROR_OBJECT (core_audio, "Failed to add stream format property "
"listener for AudioUnit: %d", (int) status);
}
/* Initialize the AudioUnit */
status = AudioUnitInitialize (core_audio->audiounit);
if (status) {