int FTSound::getNumberOfChannels(const QString &filePath){
WavFile* pfile = new WavFile(NULL);
if(!pfile->open(filePath))
return 0;
int nchan = pfile->fileFormat().channelCount();
delete pfile;
return nchan;
}
void FTSound::load(int channelid){
if(channelid>1)
throw QString("built-in WAV file reader: Can read only the first and unique channel of the file.");
m_fileaudioformat = QAudioFormat(); // Clear the format
// Create the file reader and read the format
WavFile* pfile = new WavFile(this);
if(!pfile->open(fileFullPath))
throw QString("built-in WAV file reader: Cannot open the file.");
m_fileaudioformat = pfile->fileFormat();
// Check if the format is currently supported
if(!m_fileaudioformat.isValid())
throw QString("built-in WAV file reader: Format is invalid.");
if(m_fileaudioformat.channelCount()>1)
throw QString("built-in WAV file reader: This audio file has multiple audio channel, whereas the built-in reader can read files with only a single channel. Please convert this file into a mono audio file before re-opening it.");
if(!((m_fileaudioformat.codec() == "audio/pcm") &&
m_fileaudioformat.sampleType() == QAudioFormat::SignedInt &&
m_fileaudioformat.sampleSize() == 16 &&
m_fileaudioformat.byteOrder() == QAudioFormat::LittleEndian))
throw QString("built-in WAV file reader: Supports only 16 bit signed LE mono format, whereas current format is "+formatToString(m_fileaudioformat));
setSamplingRate(m_fileaudioformat.sampleRate());
// Load the waveform data from the file
pfile->seek(pfile->headerLength());
QByteArray buffer;
qint64 toread = m_fileaudioformat.sampleSize()/8;
qint64 red;
buffer.resize(toread);
while((red = pfile->read(buffer.data(),toread))) {
if(red<toread)
throw QString("built-in WAV file reader: The data are corrupted");
// Decode the data for 16 bit signed LE mono format
const qint16 value = *reinterpret_cast<const qint16*>(buffer.constData());
wav.push_back(value/32767.0);
}
delete pfile;
}