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audiomonitor: fixed playback speed

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Audio monitor used to ignore playback speed leading to inaccurate display if the
playback was not 1x forwards.
This commit is contained in:
itsmattkc
2020-05-25 14:12:41 +10:00
parent 85a7cae3ee
commit 564cb29cc7
1 changed files with 29 additions and 3 deletions
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app/widget/audiomonitor/audiomonitor.cpp
+29 -3
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@@ -276,10 +276,36 @@ void AudioMonitor::UpdateValuesFromFile(QVector<double>& v)
qint64 current_time = QDateTime::currentMSecsSinceEpoch();
qint64 time_passed = current_time - last_time_;
// Determine how many bytes this is
int bytes_to_read = params_.time_to_bytes(static_cast<double>(time_passed) * 0.001);
// Convert ms to float seconds and determine how many bytes that is
qint64 bytes_to_read = params_.time_to_bytes(static_cast<double>(time_passed) * 0.001);
QByteArray b = file_.read(bytes_to_read);;
if (playback_speed_ < 0) {
bytes_to_read = qMin(bytes_to_read, file_.pos());
file_.seek(file_.pos() - bytes_to_read);
}
QByteArray b = file_.read(bytes_to_read);
if (playback_speed_ < 0) {
file_.seek(file_.pos() - bytes_to_read);
}
int abs_speed = qAbs(playback_speed_);
if (abs_speed != 1) {
int sample_sz = params_.samples_to_bytes(1);
int in_nb_samples = params_.bytes_to_samples(b.size());
int out_nb_samples = in_nb_samples / abs_speed;
QByteArray speed_adjusted(out_nb_samples * sample_sz, Qt::Uninitialized);
for (int i=0;i<out_nb_samples;i++) {
memcpy(speed_adjusted.data() + params_.samples_to_bytes(i),
b.constData() + params_.samples_to_bytes(i * abs_speed),
sample_sz);
}
b = speed_adjusted;
}
BytesToSampleSummary(b, v);