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Actually, QIODevice is listed as reentrant. So no need to forward audio.

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That said, latency is still absurd for some reason.
This commit is contained in:
Thomas Harte 2020-06-06 23:47:57 -04:00
parent 7c7cb61d2f
commit 63ad1290f4
1 changed files with 10 additions and 32 deletions
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42
OSBindings/Qt/mainwindow.cpp
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@ -7,15 +7,6 @@
#include "../../Numeric/CRC.hpp"
namespace {
struct AudioEvent: public QEvent {
AudioEvent() : QEvent(QEvent::Type::User) {}
std::vector<int16_t> audio;
};
}
/*
General Qt implementation notes:
@ -177,17 +168,17 @@ void MainWindow::launchMachine() {
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.
// are available, and — at least for now — assume a good buffer size.
audioIsStereo = (idealFormat.channelCount() > 1) && speaker->get_is_stereo();
audioIs8bit = idealFormat.sampleSize() < 16;
const int samplesPerBuffer = 512;
const int samplesPerBuffer = 256;
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));
// audioOutput->setBufferSize(samplesPerBuffer * (audioIsStereo ? 2 : 1) * (audioIs8bit ? 1 : 2));
qDebug() << idealFormat;
@ -235,13 +226,13 @@ void MainWindow::launchMachine() {
}
void MainWindow::speaker_did_complete_samples(Outputs::Speaker::Speaker *, const std::vector<int16_t> &buffer) {
// Forward this buffrer to the QThread that QAudioOutput lives on.
AudioEvent *event = new AudioEvent;
event->audio = buffer;
QApplication::instance()->postEvent(this, event);
// const auto bytesWritten = audioIODevice->write(reinterpret_cast<const char *>(buffer.data()), qint64(buffer.size()));
// qDebug() << bytesWritten << "; " << audioOutput->state();
// (void)bytesWritten;
const char *data = reinterpret_cast<const char *>(buffer.data());
size_t sizeLeft = buffer.size() * sizeof(int16_t);
while(sizeLeft) {
const auto bytesWritten = audioIODevice->write(data, qint64(sizeLeft));
sizeLeft -= bytesWritten;
data += bytesWritten;
}
}
void MainWindow::dragEnterEvent(QDragEnterEvent* event) {
@ -319,19 +310,6 @@ bool MainWindow::eventFilter(QObject *obj, QEvent *event) {
}
} break;
case QEvent::User: {
const auto audioEvent = dynamic_cast<AudioEvent *>(event);
if(audioEvent) {
const char *buffer = reinterpret_cast<const char *>(audioEvent->audio.data());
size_t sizeLeft = audioEvent->audio.size() * sizeof(int16_t);
while(sizeLeft) {
const auto bytesWritten = audioIODevice->write(buffer, qint64(sizeLeft));
sizeLeft -= bytesWritten;
buffer += bytesWritten;
}
}
} break;
default:
break;
}