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[AFV] Change output format and processing to 32 bit float

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32 bit float is what is used in C# reference and has a much higher
dynamic range. 16 bit integer was clipping very often with all the VHF
simulation applied.
This commit is contained in:
Roland Rossgotterer
2019-10-01 11:58:02 +02:00
committed by Mat Sutcliffe
parent fbb126370c
commit 240df93406
29 changed files with 77 additions and 80 deletions
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16
src/blackcore/afv/audio/output.cpp
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@@ -36,22 +36,20 @@ namespace BlackCore
int sampleBytes = m_outputFormat.sampleSize() / 8;
int channelCount = m_outputFormat.channelCount();
qint64 count = maxlen / (sampleBytes * channelCount);
QVector<qint16> buffer;
QVector<float> buffer;
m_sampleProvider->readSamples(buffer, count);
for (const qint16 sample : buffer)
for (float sample : buffer)
{
qint16 sampleInput = sample;
sampleInput = qAbs(sampleInput);
if (sampleInput > m_maxSampleOutput) { m_maxSampleOutput = sampleInput; }
float absSample = qAbs(sample);
if (absSample > m_maxSampleOutput) { m_maxSampleOutput = absSample; }
}
m_sampleCount += buffer.size();
if (m_sampleCount >= SampleCountPerEvent)
{
OutputVolumeStreamArgs outputVolumeStreamArgs;
qint16 maxInt = std::numeric_limits<qint16>::max();
outputVolumeStreamArgs.PeakRaw = m_maxSampleOutput / maxInt;
outputVolumeStreamArgs.PeakRaw = m_maxSampleOutput / 1.0;
outputVolumeStreamArgs.PeakDB = static_cast<float>(20 * std::log10(outputVolumeStreamArgs.PeakRaw));
const double db = qBound(m_minDb, outputVolumeStreamArgs.PeakDB, m_maxDb);
double ratio = (db - m_minDb) / (m_maxDb - m_minDb);
@@ -91,8 +89,8 @@ namespace BlackCore
QAudioFormat outputFormat;
outputFormat.setSampleRate(48000);
outputFormat.setChannelCount(1);
outputFormat.setSampleSize(16);
outputFormat.setSampleType(QAudioFormat::SignedInt);
outputFormat.setSampleSize(32);
outputFormat.setSampleType(QAudioFormat::Float);
outputFormat.setByteOrder(QAudioFormat::LittleEndian);
outputFormat.setCodec("audio/pcm");