void Lv2Plugin::process (const ProcessingContext& context)
{
slv2_instance_run(m_instance, context.bufferSize());
}
bool LV2Effect::ProcessStereo(int count, WaveTrack *left, WaveTrack *right,
sampleCount lstart,
sampleCount rstart,
sampleCount len)
{
/* Allocate buffers */
if (mBlockSize == 0) {
mBlockSize = left->GetMaxBlockSize() * 2;
fInBuffer = new float *[mAudioInputs.size()];
unsigned long i;
for (i = 0; i < mAudioInputs.size(); i++)
fInBuffer[i] = new float[mBlockSize];
fOutBuffer = new float *[mAudioOutputs.size()];
for (i = 0; i < mAudioOutputs.size(); i++)
fOutBuffer[i] = new float[mBlockSize];
}
/* Instantiate the plugin */
SLV2Instance handle = slv2_plugin_instantiate(mData, left->GetRate(),
gLV2Features);
/* Write the Note On to the MIDI event buffer and connect it */
LV2_Event_Buffer* midiBuffer;
int noteOffTime;
if (mMidiInput) {
midiBuffer = lv2_event_buffer_new(40, 2);
LV2_Event_Iterator iter;
lv2_event_begin(&iter, midiBuffer);
uint8_t noteOn[] = { 0x90, mNoteKey, mNoteVelocity };
lv2_event_write(&iter, 0, 0, 1, 3, noteOn);
noteOffTime = mNoteLength * left->GetRate();
if (noteOffTime < len && noteOffTime < mBlockSize) {
uint8_t noteOff[] = { 0x80, mNoteKey, 64 };
lv2_event_write(&iter, noteOffTime, 0, 1, 3, noteOff);
}
slv2_instance_connect_port(handle, mMidiInput->mIndex, midiBuffer);
}
unsigned long p;
for(p = 0; p < mAudioInputs.size(); p++) {
slv2_instance_connect_port(handle, mAudioInputs[p].mIndex, fInBuffer[p]);
}
for(p = 0; p < mAudioOutputs.size(); p++) {
slv2_instance_connect_port(handle, mAudioOutputs[p].mIndex, fOutBuffer[p]);
}
for (p = 0; p < mControlInputs.size(); p++) {
slv2_instance_connect_port(handle, mControlInputs[p].mIndex,
&mControlInputs[p].mControlBuffer);
}
for (p = 0; p < mControlOutputs.size(); p++) {
slv2_instance_connect_port(handle, mControlOutputs[p].mIndex,
&mControlOutputs[p].mControlBuffer);
}
slv2_instance_activate(handle);
// Actually perform the effect here
sampleCount originalLen = len;
sampleCount ls = lstart;
sampleCount rs = rstart;
bool noteOver = false;
while (len) {
int block = mBlockSize;
if (block > len)
block = len;
if (left && mAudioInputs.size() > 0) {
left->Get((samplePtr)fInBuffer[0], floatSample, ls, block);
}
if (right && mAudioInputs.size() > 1) {
right->Get((samplePtr)fInBuffer[1], floatSample, rs, block);
}
slv2_instance_run(handle, block);
if (left && mAudioOutputs.size() > 0) {
left->Set((samplePtr)fOutBuffer[0], floatSample, ls, block);
}
if (right && mAudioOutputs.size() > 1) {
right->Set((samplePtr)fOutBuffer[1], floatSample, rs, block);
}
len -= block;
noteOffTime -= block;
ls += block;
rs += block;
// Clear the event buffer and add the note off event if needed
if (mMidiInput) {
lv2_event_buffer_reset(midiBuffer, 1,
(uint8_t*)midiBuffer +
sizeof(LV2_Event_Buffer));
if (!noteOver && noteOffTime < len && noteOffTime < block) {
LV2_Event_Iterator iter;
lv2_event_begin(&iter, midiBuffer);
uint8_t noteOff[] = { 0x80, mNoteKey, 64 };
lv2_event_write(&iter, noteOffTime, 0, 1, 3, noteOff);
noteOver = true;
}
}
if (mAudioInputs.size() > 1) {
if (TrackGroupProgress(count, (ls-lstart)/(double)originalLen))
return false;
}
else {
if (TrackProgress(count, (ls-lstart)/(double)originalLen))
return false;
}
}
slv2_instance_deactivate(handle);
slv2_instance_free(handle);
return true;
}