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/***
Olive - Non-Linear Video Editor
Copyright (C) 2019 Olive Team
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
***/
#include "waveoutput.h"
OLIVE_NAMESPACE_ENTER
const int16_t kWAVIntegerFormat = 1;
const int16_t kWAVFloatFormat = 3;
WaveOutput::WaveOutput(const QString &f,
const AudioParams& params) :
file_(f),
params_(params)
{
Q_ASSERT(params_.is_valid());
}
WaveOutput::~WaveOutput()
{
close();
}
bool WaveOutput::open()
{
data_length_ = 0;
if (file_.open(QFile::WriteOnly)) {
// RIFF header
file_.write("RIFF");
// Total file size minus RIFF and this integer (minus 8 bytes, filled in later)
write_int<int32_t>(&file_, 0);
// File type header
file_.write("WAVE");
// Begin format descriptor chunk
file_.write("fmt ");
// Format chunk size
write_int<int32_t>(&file_, 16);
// Type of format
switch (params_.format()) {
case SampleFormat::SAMPLE_FMT_U8:
case SampleFormat::SAMPLE_FMT_S16:
case SampleFormat::SAMPLE_FMT_S32:
case SampleFormat::SAMPLE_FMT_S64:
write_int<int16_t>(&file_, kWAVIntegerFormat);
break;
case SampleFormat::SAMPLE_FMT_FLT:
case SampleFormat::SAMPLE_FMT_DBL:
write_int<int16_t>(&file_, kWAVFloatFormat);
break;
case SampleFormat::SAMPLE_FMT_INVALID:
case SampleFormat::SAMPLE_FMT_COUNT:
qWarning() << "Invalid sample format for WAVE audio";
file_.close();
return false;
}
// Number of channels
write_int<int16_t>(&file_, static_cast<int16_t>(params_.channel_count()));
// Sample rate
write_int<int32_t>(&file_, params_.sample_rate());
// Bytes per second
write_int<int32_t>(&file_, params_.samples_to_bytes(params_.sample_rate()));
// Bytes per sample
write_int<int16_t>(&file_, static_cast<int16_t>(params_.samples_to_bytes(1)));
// Bits per sample per channel
write_int<int16_t>(&file_, static_cast<int16_t>(params_.bits_per_sample()));
// Data chunk header
file_.write("data");
// Size of data chunk (filled in later)
write_int<int32_t>(&file_, 0);
return true;
}
return false;
}
void WaveOutput::write(const QByteArray &bytes)
{
if (file_.isOpen()) {
file_.write(bytes);
data_length_ += bytes.size();
}
}
void WaveOutput::write(const char *bytes, int length)
{
if (file_.isOpen()) {
file_.write(bytes, length);
data_length_ += length;
}
}
void WaveOutput::close()
{
if (file_.isOpen()) {
// Write file sizes
file_.seek(4);
write_int<int32_t>(&file_, data_length_ + 36);
file_.seek(40);
write_int<int32_t>(&file_, data_length_);
file_.close();
}
}
const int& WaveOutput::data_length() const
{
return data_length_;
}
const AudioParams &WaveOutput::params() const
{
return params_;
}
void WaveOutput::switch_endianness(QByteArray& array)
{
int half_sz = array.size()/2;
for (int i=0;i<half_sz;i++) {
int oppose_index = array.size() - i - 1;
char temp = array[i];
array[i] = array[oppose_index];
array[oppose_index] = temp;
}
}
template<typename T>
void WaveOutput::write_int(QFile *file, T integer)
{
QByteArray bytes;
bytes.resize(sizeof(T));
memcpy(bytes.data(), &integer, static_cast<size_t>(bytes.size()));
// WAV expects little-endian, so if the integer is big endian we need to switch
if (QSysInfo::ByteOrder == QSysInfo::BigEndian) {
switch_endianness(bytes);
}
file->write(bytes);
}
OLIVE_NAMESPACE_EXIT
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