void
WavFileReader::getInterleavedFrames(size_t start, size_t count,
SampleBlock &results) const
{
if (count == 0) return;
results.clear();
results.reserve(count * m_fileInfo.channels);
QMutexLocker locker(&m_mutex);
if (!m_file || !m_channelCount) {
return;
}
if ((long)start >= m_fileInfo.frames) {
// SVDEBUG << "WavFileReader::getInterleavedFrames: " << start
// << " > " << m_fileInfo.frames << endl;
return;
}
if (long(start + count) > m_fileInfo.frames) {
count = m_fileInfo.frames - start;
}
sf_count_t readCount = 0;
if (start != m_lastStart || count != m_lastCount) {
if (sf_seek(m_file, start, SEEK_SET) < 0) {
// std::cerr << "sf_seek failed" << std::endl;
return;
}
if (count * m_fileInfo.channels > m_bufsiz) {
// std::cerr << "WavFileReader: Reallocating buffer for " << count
// << " frames, " << m_fileInfo.channels << " channels: "
// << m_bufsiz << " floats" << std::endl;
m_bufsiz = count * m_fileInfo.channels;
delete[] m_buffer;
m_buffer = new float[m_bufsiz];
}
if ((readCount = sf_readf_float(m_file, m_buffer, count)) < 0) {
// std::cerr << "sf_readf_float failed" << std::endl;
return;
}
m_lastStart = start;
m_lastCount = readCount;
}
for (size_t i = 0; i < count * m_fileInfo.channels; ++i) {
if (i >= m_bufsiz) {
std::cerr << "INTERNAL ERROR: WavFileReader::getInterleavedFrames: " << i << " >= " << m_bufsiz << std::endl;
}
results.push_back(m_buffer[i]);
}
return;
}
