OSStatus
gst_osx_audio_sink_io_proc (AudioDeviceID inDevice,
const AudioTimeStamp * inNow, const AudioBufferList * inInputData,
const AudioTimeStamp * inInputTime, AudioBufferList * outOutputData,
const AudioTimeStamp * inOutputTime, void *inClientData)
{
GstOsxRingBuffer *buf = GST_OSX_RING_BUFFER (inClientData);
guint8 *readptr;
gint readseg;
gint len;
if (gst_ring_buffer_prepare_read (GST_RING_BUFFER (buf), &readseg, &readptr,
&len)) {
outOutputData->mBuffers[0].mDataByteSize = len;
memcpy ((char *) outOutputData->mBuffers[0].mData, readptr, len);
/* clear written samples */
gst_ring_buffer_clear (GST_RING_BUFFER (buf), readseg);
/* we wrote one segment */
gst_ring_buffer_advance (GST_RING_BUFFER (buf), 1);
}
return 0;
}
static OSStatus
gst_osx_audio_src_io_proc (GstOsxRingBuffer * buf,
AudioUnitRenderActionFlags * ioActionFlags,
const AudioTimeStamp * inTimeStamp,
UInt32 inBusNumber, UInt32 inNumberFrames, AudioBufferList * bufferList)
{
OSStatus status;
guint8 *writeptr;
gint writeseg;
gint len;
gint remaining;
gint offset = 0;
status = AudioUnitRender (buf->core_audio->audiounit, ioActionFlags,
inTimeStamp, inBusNumber, inNumberFrames, buf->core_audio->recBufferList);
if (status) {
GST_WARNING_OBJECT (buf, "AudioUnitRender returned %d", (int) status);
return status;
}
remaining = buf->core_audio->recBufferList->mBuffers[0].mDataByteSize;
while (remaining) {
if (!gst_ring_buffer_prepare_read (GST_RING_BUFFER (buf),
&writeseg, &writeptr, &len))
return 0;
len -= buf->segoffset;
if (len > remaining)
len = remaining;
memcpy (writeptr + buf->segoffset,
(char *) buf->core_audio->recBufferList->mBuffers[0].mData + offset,
len);
buf->segoffset += len;
offset += len;
remaining -= len;
if ((gint) buf->segoffset == GST_RING_BUFFER (buf)->spec.segsize) {
/* we wrote one segment */
gst_ring_buffer_advance (GST_RING_BUFFER (buf), 1);
buf->segoffset = 0;
}
}
return 0;
}
/* GstBaseAudioSrc vmethod implementations */
static GstRingBuffer *
gst_directsound_src_create_ringbuffer (GstBaseAudioSrc * src)
{
GstDirectSoundSrc * dsoundsrc;
GstDirectSoundRingBuffer * ringbuffer;
dsoundsrc = GST_DIRECTSOUND_SRC (src);
GST_DEBUG ("creating ringbuffer");
ringbuffer = g_object_new (GST_TYPE_DIRECTSOUND_RING_BUFFER, NULL);
GST_DEBUG ("directsound src 0x%p", dsoundsrc);
/* capture */
ringbuffer->is_src = TRUE;
/* set the src element on the ringbuffer for error messages */
ringbuffer->element = GST_ELEMENT (dsoundsrc);
/* set the ringbuffer on the src */
dsoundsrc->dsoundbuffer = ringbuffer;
/* set initial volume on ringbuffer */
dsoundsrc->dsoundbuffer->volume = dsoundsrc->volume;
return GST_RING_BUFFER (ringbuffer);
}
/* GstBaseAudioSink vmethod implementations */
static GstRingBuffer *
gst_osx_audio_sink_create_ringbuffer (GstBaseAudioSink * sink)
{
GstOsxAudioSink *osxsink;
osxsink = GST_OSX_AUDIO_SINK (sink);
if (!osxsink->ringbuffer) {
GST_DEBUG ("Creating ringbuffer");
osxsink->ringbuffer = g_object_new (GST_TYPE_OSX_RING_BUFFER, NULL);
GST_DEBUG ("osx sink 0x%p element 0x%p ioproc 0x%p", osxsink,
GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsink),
(void *) gst_osx_audio_sink_io_proc);
osxsink->ringbuffer->element =
GST_OSX_AUDIO_ELEMENT_GET_INTERFACE (osxsink);
}
return GST_RING_BUFFER (osxsink->ringbuffer);
}
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);
}
