// +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
SamplesBuffer *MetronomeTrackNode::readWavFile(const QString &fileName, quint32 &sampleRate)
{
// Open wave file
QFile wavFile(fileName);
if (!wavFile.open(QFile::ReadOnly)) {
qWarning() << "Failed to open WAV file...";
return nullptr; // Done
}
// Read in the whole thing
QByteArray wavFileContent = wavFile.readAll();
// Define the header components
quint8 fileType[4];
quint32 fileSize;
quint8 waveName[4];
quint8 fmtName[3];
quint32 fmtLength;
quint16 fmtType;
quint16 numberOfChannels;
quint32 sampleRateXBitsPerSampleXChanngelsDivEight;
quint16 bitsPerSampleXChannelsDivEightPointOne;
quint16 bitsPerSample;
quint8 dataHeader[4];
quint32 dataSize;
// Create a data stream to analyze the data
QDataStream stream(&wavFileContent, QIODevice::ReadOnly);
stream.setByteOrder(QDataStream::LittleEndian);
// Now pop off the appropriate data into each header field defined above
stream.readRawData((char *)fileType, 4); // "RIFF"
stream >> fileSize; // File Size
stream.readRawData((char *)waveName, 4); // "WAVE"
stream.readRawData((char *)fmtName, 4); // "fmt"
stream >> fmtLength; // Format length
stream >> fmtType; // Format type
stream >> numberOfChannels; // Number of channels
stream >> sampleRate; // Sample rate
stream >> sampleRateXBitsPerSampleXChanngelsDivEight; // (Sample Rate * BitsPerSample * Channels) / 8
stream >> bitsPerSampleXChannelsDivEightPointOne; // (BitsPerSample * Channels) / 8.1
stream >> bitsPerSample; // Bits per sample
stream.readRawData((char *)dataHeader, 4); // "data" header
stream >> dataSize; // Data Size
int samples = dataSize / numberOfChannels / (bitsPerSample/ 8);
SamplesBuffer *buffer = new SamplesBuffer(numberOfChannels, samples);
// Now pull out the data
qint16 sample = 0;
for (int s = 0; s < samples; ++s) {
for (int c = 0; c < numberOfChannels; ++c) {
stream >> sample;
buffer->set(c, s, sample / 32767.0f);
}
}
return buffer;
}
void AudioNode::processReplacing(const SamplesBuffer &in, SamplesBuffer &out, int sampleRate, std::vector<midi::MidiMessage> &midiBuffer)
{
Q_UNUSED(in);
if (!isActivated())
return;
internalInputBuffer.setFrameLenght(out.getFrameLenght());
internalOutputBuffer.setFrameLenght(out.getFrameLenght());
{
QMutexLocker locker(&mutex);
for (auto node : connections) { // ask connected nodes to generate audio
node->processReplacing(internalInputBuffer, internalOutputBuffer, sampleRate, midiBuffer);
}
}
internalOutputBuffer.set(internalInputBuffer); // if we have no plugins inserted the input samples are just copied to output buffer.
static SamplesBuffer tempInputBuffer(2);
// process inserted plugins
for (int i=0; i < MAX_PROCESSORS_PER_TRACK; ++i) {
auto processor = processors[i];
if (processor && !processor->isBypassed()) {
tempInputBuffer.setFrameLenght(internalOutputBuffer.getFrameLenght());
tempInputBuffer.set(internalOutputBuffer); // the output from previous plugin is used as input to the next plugin in the chain
processor->process(tempInputBuffer, internalOutputBuffer, midiBuffer);
// some plugins are blocking the midi messages. If a VSTi can't generate messages the previous messages list will be sended for the next plugin in the chain. The messages list is cleared only when the plugin can generate midi messages.
if (processor->isVirtualInstrument() && processor->canGenerateMidiMessages())
midiBuffer.clear(); // only the fresh messages will be passed by the next plugin in the chain
auto pulledMessages = pullMidiMessagesGeneratedByPlugins();
midiBuffer.insert(midiBuffer.end(), pulledMessages.begin(), pulledMessages.end());
}
}
preFaderProcess(internalOutputBuffer); //call overrided preFaderProcess in subclasses to allow some preFader process.
internalOutputBuffer.applyGain(gain, leftGain, rightGain, boost);
lastPeak.update(internalOutputBuffer.computePeak());
postFaderProcess(internalOutputBuffer);
out.add(internalOutputBuffer);
}