utils.cpp Example File

multimedia/spectrum/app/utils.cpp
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#include <QAudioFormat> #include "utils.h" qint64 audioDuration(const QAudioFormat &format, qint64 bytes) { return (bytes * 1000000) / (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8)); } qint64 audioLength(const QAudioFormat &format, qint64 microSeconds) { qint64 result = (format.sampleRate() * format.channelCount() * (format.sampleSize() / 8)) * microSeconds / 1000000; result -= result % (format.channelCount() * format.sampleSize()); return result; } qreal nyquistFrequency(const QAudioFormat &format) { return format.sampleRate() / 2; } QString formatToString(const QAudioFormat &format) { QString result; if (QAudioFormat() != format) { if (format.codec() == "audio/pcm") { Q_ASSERT(format.sampleType() == QAudioFormat::SignedInt); const QString formatEndian = (format.byteOrder() == QAudioFormat::LittleEndian) ? QString("LE") : QString("BE"); QString formatType; switch (format.sampleType()) { case QAudioFormat::SignedInt: formatType = "signed"; break; case QAudioFormat::UnSignedInt: formatType = "unsigned"; break; case QAudioFormat::Float: formatType = "float"; break; case QAudioFormat::Unknown: formatType = "unknown"; break; } QString formatChannels = QString("%1 channels").arg(format.channelCount()); switch (format.channelCount()) { case 1: formatChannels = "mono"; break; case 2: formatChannels = "stereo"; break; } result = QString("%1 Hz %2 bit %3 %4 %5") .arg(format.sampleRate()) .arg(format.sampleSize()) .arg(formatType) .arg(formatEndian) .arg(formatChannels); } else { result = format.codec(); } } return result; } bool isPCM(const QAudioFormat &format) { return (format.codec() == "audio/pcm"); } bool isPCMS16LE(const QAudioFormat &format) { return isPCM(format) && format.sampleType() == QAudioFormat::SignedInt && format.sampleSize() == 16 && format.byteOrder() == QAudioFormat::LittleEndian; } const qint16 PCMS16MaxValue = 32767; const quint16 PCMS16MaxAmplitude = 32768; // because minimum is -32768 qreal pcmToReal(qint16 pcm) { return qreal(pcm) / PCMS16MaxAmplitude; } qint16 realToPcm(qreal real) { return real * PCMS16MaxValue; }