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#include "AudioDecoder.h"
AudioDecoder::AudioDecoder(QObject *parent) :
QIODevice(parent),
m_state { AudioDecoder::Stopped },
m_input { &m_data, this },
m_output { &m_data, this },
m_init { false },
m_isDecodingFinished { false }
{
setOpenMode(QIODevice::ReadOnly);
m_decoder = new QAudioDecoder(this);
connect(m_decoder, &QAudioDecoder::bufferReady, this, &AudioDecoder::bufferReady);
connect(m_decoder, static_cast<void(QAudioDecoder::*)(QAudioDecoder::Error)>(&QAudioDecoder::error), this, &AudioDecoder::errored);
connect(m_decoder, &QAudioDecoder::finished, this, &AudioDecoder::finished);
}
AudioDecoder::~AudioDecoder(){
stop();
}
// initialize an audio device
void AudioDecoder::init(const QAudioFormat &format) {
m_decoder->setAudioFormat(format);
if (!m_output.open(QIODevice::ReadOnly) || !m_input.open(QIODevice::WriteOnly)){
m_init = false;
return;
}
m_init = true;
emit initialized();
}
// play an audio file
void AudioDecoder::start(const QString &filePath){
if(!m_init){
return;
}
if(m_state == AudioDecoder::Decoding){
return;
}
m_state = AudioDecoder::Decoding;
m_decoder->setSourceFilename(filePath);
m_decoder->start();
}
// Stop playing audio
void AudioDecoder::stop() {
m_state = AudioDecoder::Stopped;
m_decoder->stop();
m_data.clear();
m_isDecodingFinished = false;
}
// io device, read into buffer.
qint64 AudioDecoder::readData(char* data, qint64 maxlen) {
memset(data, 0, maxlen);
if (m_state == AudioDecoder::Decoding){
m_output.read(data, maxlen);
// Emulate QAudioProbe behaviour for audio data that is sent to output device
if (maxlen > 0){
QByteArray buff(data, maxlen);
emit newData(buff);
}
// Is finish of file
if (atEnd()){
stop();
}
}
return maxlen;
}
// io device, unused.
qint64 AudioDecoder::writeData(const char* data, qint64 len) {
Q_UNUSED(data);
Q_UNUSED(len);
return 0;
}
// io device, at end of device
bool AudioDecoder::atEnd() const {
bool value = m_output.size()
&& m_output.atEnd()
&& m_isDecodingFinished;
return value;
}
// handle buffered data ready
void AudioDecoder::bufferReady() {
const QAudioBuffer &buffer = m_decoder->read();
if(!buffer.isValid()){
return;
}
const int length = buffer.byteCount();
const char *data = buffer.constData<char>();
m_input.write(data, length);
}
// handle buffered data decoding is finished
void AudioDecoder::finished() {
m_isDecodingFinished = true;
}
// handle buffered data decoding error
void AudioDecoder::errored(QAudioDecoder::Error /*error*/) {
stop();
}
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