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Makes an unsuccessful attempt at producing audio.

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On the plus side, it does seem successfully to sniff out an appropriate audio format and to communicate mono/stereo onward.
This commit is contained in:
Thomas Harte
2020-06-06 19:19:01 -04:00
parent e47cb91223
commit 378ff39e5e
3 changed files with 50 additions and 2 deletions
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41
OSBindings/Qt/mainwindow.cpp
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@@ -142,9 +142,17 @@ void MainWindow::launchMachine() {
switch(error) {
default: {
// TODO: correct assumptions herein that this is the first machine to be
// assigned to this window.
ui->missingROMsBox->setVisible(false);
uiPhase = UIPhase::RunningMachine;
// Install user-friendly options. TODO: plus user overrides.
// const auto configurable = machine->configurable_device();
// if(configurable) {
// configurable->set_options(configurable->get_options());
// }
// Supply the scan target.
// TODO: in the future, hypothetically, deal with non-scan producers.
const auto scan_producer = machine->scan_producer();
@@ -152,6 +160,33 @@ void MainWindow::launchMachine() {
scan_producer->set_scan_target(ui->openGLWidget->getScanTarget());
}
// Install audio output if required.
const auto audio_producer = machine->audio_producer();
if(audio_producer) {
const auto speaker = audio_producer->get_speaker();
if(speaker) {
const QAudioDeviceInfo &defaultDeviceInfo = QAudioDeviceInfo::defaultOutputDevice();
QAudioFormat idealFormat = defaultDeviceInfo.preferredFormat();
// Use the ideal format's sample rate, provide stereo as long as at least two channels
// are available, and — at least for now — assume 512 samples/buffer is a good size.
audioIsStereo = (idealFormat.channelCount() > 1) && speaker->get_is_stereo();
audioIs8bit = idealFormat.sampleSize() < 16;
const int samplesPerBuffer = 512;
speaker->set_output_rate(idealFormat.sampleRate(), samplesPerBuffer, audioIsStereo);
// Adjust format appropriately, and create an audio output.
idealFormat.setChannelCount(1 + int(audioIsStereo));
idealFormat.setSampleSize(audioIs8bit ? 8 : 16);
audioOutput = std::make_unique<QAudioOutput>(idealFormat, this);
audioOutput->setBufferSize(samplesPerBuffer * (audioIsStereo ? 2 : 1) * (audioIs8bit ? 1 : 2));
// Start the output.
speaker->set_delegate(this);
audioIODevice = audioOutput->start();
}
}
// If this is a timed machine, start up the timer.
const auto timedMachine = machine->timed_machine();
if(timedMachine) {
@@ -189,6 +224,12 @@ void MainWindow::launchMachine() {
}
}
void MainWindow::speaker_did_complete_samples(Outputs::Speaker::Speaker *, const std::vector<int16_t> &buffer) {
const auto bytesWritten = audioIODevice->write(reinterpret_cast<const char *>(buffer.data()), qint64(buffer.size()));
// qDebug() << bytesWritten << "; " << audioOutput->state();
(void)bytesWritten;
}
void MainWindow::dragEnterEvent(QDragEnterEvent* event) {
// Always accept dragged files.
if(event->mimeData()->hasUrls())