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** This file is part of the examples of the Qt Toolkit.
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#include "audiodecoder.h"
#include <stdio.h>
AudioDecoder::AudioDecoder(bool isPlayback, bool isDelete)
: m_cout(stdout, QIODevice::WriteOnly)
{
m_isPlayback = isPlayback;
m_isDelete = isDelete;
// Make sure the data we receive is in correct PCM format.
// Our wav file writer only supports SignedInt sample type.
QAudioFormat format;
format.setChannelCount(2);
format.setSampleSize(16);
format.setSampleRate(48000);
format.setCodec("audio/pcm");
format.setSampleType(QAudioFormat::SignedInt);
m_decoder.setAudioFormat(format);
connect(&m_decoder, &QAudioDecoder::bufferReady,
this, &AudioDecoder::bufferReady);
connect(&m_decoder, QOverload<QAudioDecoder::Error>::of(&QAudioDecoder::error),
this, QOverload<QAudioDecoder::Error>::of(&AudioDecoder::error));
connect(&m_decoder, &QAudioDecoder::stateChanged,
this, &AudioDecoder::stateChanged);
connect(&m_decoder, &QAudioDecoder::finished,
this, &AudioDecoder::finished);
connect(&m_decoder, &QAudioDecoder::positionChanged,
this, &AudioDecoder::updateProgress);
connect(&m_decoder, &QAudioDecoder::durationChanged,
this, &AudioDecoder::updateProgress);
connect(&m_soundEffect, &QSoundEffect::statusChanged,
this, &AudioDecoder::playbackStatusChanged);
connect(&m_soundEffect, &QSoundEffect::playingChanged,
this, &AudioDecoder::playingChanged);
m_progress = -1.0;
}
void AudioDecoder::setSourceFilename(const QString &fileName)
{
m_decoder.setSourceFilename(fileName);
}
void AudioDecoder::start()
{
m_decoder.start();
}
void AudioDecoder::stop()
{
m_decoder.stop();
}
void AudioDecoder::setTargetFilename(const QString &fileName)
{
m_targetFilename = fileName;
}
void AudioDecoder::bufferReady()
{
// read a buffer from audio decoder
QAudioBuffer buffer = m_decoder.read();
if (!buffer.isValid())
return;
if (!m_fileWriter.isOpen() && !m_fileWriter.open(m_targetFilename, buffer.format())) {
m_decoder.stop();
return;
}
m_fileWriter.write(buffer);
}
void AudioDecoder::error(QAudioDecoder::Error error)
{
switch (error) {
case QAudioDecoder::NoError:
return;
case QAudioDecoder::ResourceError:
m_cout << "Resource error\n";
break;
case QAudioDecoder::FormatError:
m_cout << "Format error\n";
break;
case QAudioDecoder::AccessDeniedError:
m_cout << "Access denied error\n";
break;
case QAudioDecoder::ServiceMissingError:
m_cout << "Service missing error\n";
break;
}
emit done();
}
void AudioDecoder::stateChanged(QAudioDecoder::State newState)
{
switch (newState) {
case QAudioDecoder::DecodingState:
m_cout << "Decoding...\n";
break;
case QAudioDecoder::StoppedState:
m_cout << "Decoding stopped\n";
break;
}
}
void AudioDecoder::finished()
{
if (!m_fileWriter.close())
m_cout << "Failed to finilize output file\n";
m_cout << "Decoding finished\n";
if (m_isPlayback) {
m_cout << "Starting playback\n";
m_soundEffect.setSource(QUrl::fromLocalFile(m_targetFilename));
m_soundEffect.play();
} else {
emit done();
}
}
void AudioDecoder::playbackStatusChanged()
{
if (m_soundEffect.status() == QSoundEffect::Error) {
m_cout << "Playback error\n";
emit done();
}
}
void AudioDecoder::playingChanged()
{
if (!m_soundEffect.isPlaying()) {
m_cout << "Playback finished\n";
if (m_isDelete)
QFile::remove(m_targetFilename);
emit done();
}
}
void AudioDecoder::updateProgress()
{
qint64 position = m_decoder.position();
qint64 duration = m_decoder.duration();
qreal progress = m_progress;
if (position >= 0 && duration > 0)
progress = position / (qreal)duration;
if (progress > m_progress + 0.1) {
m_cout << "Decoding progress: " << (int)(progress * 100.0) << "%\n";
m_progress = progress;
}
}