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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 "outputdeviceproxy.h"
#include "audiomanager.h"
OLIVE_NAMESPACE_ENTER
AudioOutputDeviceProxy::~AudioOutputDeviceProxy()
{
if (file_.isOpen()) {
file_.close();
}
}
void AudioOutputDeviceProxy::SetParameters(const AudioParams ¶ms)
{
params_ = params;
}
void AudioOutputDeviceProxy::SetDevice(const QString &filename, qint64 offset, int playback_speed)
{
if (file_.isOpen()) {
file_.close();
}
file_.setFileName(filename);
if (!file_.open(QFile::ReadOnly)) {
qCritical() << "Failed to open" << filename << "for audio playback";
return;
}
file_.seek(offset);
playback_speed_ = playback_speed;
if (qAbs(playback_speed_) != 1) {
tempo_processor_.Open(params_, qAbs(playback_speed_));
}
}
void AudioOutputDeviceProxy::close()
{
QIODevice::close();
file_.close();
if (tempo_processor_.IsOpen()) {
tempo_processor_.Close();
}
}
qint64 AudioOutputDeviceProxy::readData(char *data, qint64 maxlen)
{
if (!file_.isOpen()) {
return 0;
}
qint64 read_count;
if (tempo_processor_.IsOpen()) {
while ((read_count = tempo_processor_.Pull(data, static_cast<int>(maxlen))) == 0) {
int dev_read = static_cast<int>(ReverseAwareRead(data, maxlen));
if (!dev_read) {
break;
}
tempo_processor_.Push(data, dev_read);
}
} else {
// If we aren't doing any tempo processing, simply passthrough the read signal
read_count = ReverseAwareRead(data, maxlen);
}
return read_count;
}
qint64 AudioOutputDeviceProxy::writeData(const char *data, qint64 maxSize)
{
Q_UNUSED(data)
Q_UNUSED(maxSize)
return 0;
}
qint64 AudioOutputDeviceProxy::ReverseAwareRead(char *data, qint64 maxlen)
{
qint64 new_pos = -1;
if (playback_speed_ < 0) {
// If we're reversing, we'll seek back by maxlen bytes before we read
new_pos = file_.pos() - maxlen;
if (new_pos < 0) {
maxlen = file_.pos();
new_pos = 0;
}
file_.seek(new_pos);
}
qint64 read_count = file_.read(data, maxlen);
if (playback_speed_ < 0) {
file_.seek(new_pos);
// Reverse the samples here
AudioManager::ReverseBuffer(data, static_cast<int>(read_count), params_.samples_to_bytes(1));
}
return read_count;
}
OLIVE_NAMESPACE_EXIT
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