void FlangerNode::Connect(
status_t status,
const media_source& source,
const media_destination& destination,
const media_format& format,
char* pioName) {
PRINT(("FlangerNode::Connect()\n"));
status_t err;
// connection failed?
if(status < B_OK) {
PRINT(("\tStatus: %s\n", strerror(status)));
// 'unreserve' the output
m_output.destination = media_destination::null;
return;
}
// connection established:
strncpy(pioName, m_output.name, B_MEDIA_NAME_LENGTH);
m_output.destination = destination;
m_format = format;
// figure downstream latency
media_node_id timeSource;
err = FindLatencyFor(m_output.destination, &m_downstreamLatency, &timeSource);
if(err < B_OK) {
PRINT(("\t!!! FindLatencyFor(): %s\n", strerror(err)));
}
PRINT(("\tdownstream latency = %Ld\n", m_downstreamLatency));
// prepare the filter
initFilter();
// figure processing time
m_processingLatency = calcProcessingLatency();
PRINT(("\tprocessing latency = %Ld\n", m_processingLatency));
// store summed latency
SetEventLatency(m_downstreamLatency + m_processingLatency);
if(m_input.source != media_source::null) {
// pass new latency upstream
err = SendLatencyChange(
m_input.source,
m_input.destination,
EventLatency() + SchedulingLatency());
if(err < B_OK)
PRINT(("\t!!! SendLatencyChange(): %s\n", strerror(err)));
}
// cache buffer duration
SetBufferDuration(
buffer_duration(
m_format.u.raw_audio));
}
// [re-]initialize operation if necessary
void AudioFilterNode::updateOperation() {
if(m_input.source == media_source::null ||
m_output.destination == media_destination::null)
// not fully connected; nothing to do
return;
// ask the factory for an operation
ASSERT(m_opFactory);
IAudioOp* op = m_opFactory->createOp(
this,
m_input.format.u.raw_audio,
m_output.format.u.raw_audio);
if(!op) {
PRINT((
"!!! AudioFilterNode::updateOperation(): no operation created!\n"));
// clean up existing operation
delete m_op;
m_op = 0;
return;
}
// install new operation
op->replace(m_op);
m_op = op;
// do performance tests (what if I'm running? +++++)
m_processingLatency = calcProcessingLatency();
PRINT(("\tprocessing latency = %Ld\n", m_processingLatency));
// store summed latency
SetEventLatency(m_downstreamLatency + m_processingLatency);
// pass new latency upstream
status_t err = SendLatencyChange(
m_input.source,
m_input.destination,
EventLatency() + SchedulingLatency());
if(err < B_OK)
PRINT(("\t!!! SendLatencyChange(): %s\n", strerror(err)));
}
