gboolean
gst_core_audio_open (GstCoreAudio * core_audio)
{
if (!gst_core_audio_open_impl (core_audio))
return FALSE;
if (core_audio->is_src) {
AudioStreamBasicDescription asbd_in;
UInt32 propertySize;
OSStatus status;
GstOsxAudioSrc *src =
GST_OSX_AUDIO_SRC (GST_OBJECT_PARENT (core_audio->osxbuf));
propertySize = sizeof (asbd_in);
status = AudioUnitGetProperty (core_audio->audiounit,
kAudioUnitProperty_StreamFormat,
kAudioUnitScope_Input, 1, &asbd_in, &propertySize);
if (status) {
AudioComponentInstanceDispose (core_audio->audiounit);
core_audio->audiounit = NULL;
GST_WARNING_OBJECT (core_audio,
"Unable to obtain device properties: %d", (int) status);
return FALSE;
} else {
src->deviceChannels = asbd_in.mChannelsPerFrame;
}
}
return TRUE;
}
static void
gst_osx_audio_src_get_property (GObject * object, guint prop_id,
GValue * value, GParamSpec * pspec)
{
GstOsxAudioSrc *src = GST_OSX_AUDIO_SRC (object);
switch (prop_id) {
case ARG_DEVICE:
g_value_set_int (value, src->device_id);
break;
default:
G_OBJECT_WARN_INVALID_PROPERTY_ID (object, prop_id, pspec);
break;
}
}
static GstRingBuffer *
gst_osx_audio_src_create_ringbuffer (GstBaseAudioSrc * src)
{
GstOsxAudioSrc *osxsrc;
GstOsxRingBuffer *ringbuffer;
osxsrc = GST_OSX_AUDIO_SRC (src);
gst_osx_audio_src_select_device (osxsrc);
GST_DEBUG ("Creating ringbuffer");
ringbuffer = g_object_new (GST_TYPE_OSX_RING_BUFFER, NULL);
GST_DEBUG ("osx src 0x%p element 0x%p ioproc 0x%p", osxsrc,
GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsrc),
(void *) gst_osx_audio_src_io_proc);
ringbuffer->element = GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsrc);
ringbuffer->is_src = TRUE;
ringbuffer->device_id = osxsrc->device_id;
return GST_RING_BUFFER (ringbuffer);
}
static GstCaps *
gst_osx_audio_src_get_caps (GstBaseSrc * src)
{
GstElementClass *gstelement_class;
GstOsxAudioSrc *osxsrc;
GstPadTemplate *pad_template;
GstCaps *caps;
gint min, max;
gstelement_class = GST_ELEMENT_GET_CLASS (src);
osxsrc = GST_OSX_AUDIO_SRC (src);
if (osxsrc->deviceChannels == -1) {
/* -1 means we don't know the number of channels yet. for now, return
* template caps.
*/
return NULL;
}
max = osxsrc->deviceChannels;
if (max < 1)
max = 1; /* 0 channels means 1 channel? */
min = MIN (1, max);
pad_template = gst_element_class_get_pad_template (gstelement_class, "src");
g_return_val_if_fail (pad_template != NULL, NULL);
caps = gst_caps_copy (gst_pad_template_get_caps (pad_template));
if (min == max) {
gst_caps_set_simple (caps, "channels", G_TYPE_INT, max, NULL);
} else {
gst_caps_set_simple (caps, "channels", GST_TYPE_INT_RANGE, min, max,
NULL);
}
return caps;
}
