143 lines
3.1 KiB
C++
143 lines
3.1 KiB
C++
/***
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Olive - Non-Linear Video Editor
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Copyright (C) 2021 Olive Team
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This program is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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***/
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#include "outputdeviceproxy.h"
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#include "audiomanager.h"
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namespace olive {
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AudioOutputDeviceProxy::AudioOutputDeviceProxy(QObject *parent) :
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QIODevice(parent),
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device_(nullptr)
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{
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}
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void AudioOutputDeviceProxy::SetParameters(const AudioParams ¶ms)
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{
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params_ = params;
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}
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void AudioOutputDeviceProxy::SetDevice(QIODevice* device, qint64 offset, int playback_speed)
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{
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if (device_) {
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delete device_;
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}
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device_ = device;
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device_->setParent(this);
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if (!device_->open(QFile::ReadOnly)) {
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qCritical() << "Failed to open IO device for audio playback";
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delete device_;
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device_ = nullptr;
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return;
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}
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device_->seek(offset);
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playback_speed_ = playback_speed;
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if (qAbs(playback_speed_) != 1) {
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tempo_processor_.Open(params_, qAbs(playback_speed_));
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}
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}
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void AudioOutputDeviceProxy::close()
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{
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QIODevice::close();
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delete device_;
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device_ = nullptr;
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if (tempo_processor_.IsOpen()) {
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tempo_processor_.Close();
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}
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}
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qint64 AudioOutputDeviceProxy::readData(char *data, qint64 maxlen)
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{
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if (!device_) {
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return 0;
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}
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qint64 read_count;
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if (tempo_processor_.IsOpen()) {
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while ((read_count = tempo_processor_.Pull(data, static_cast<int>(maxlen))) == 0) {
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int dev_read = static_cast<int>(ReverseAwareRead(data, maxlen));
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if (!dev_read) {
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break;
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}
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tempo_processor_.Push(data, dev_read);
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}
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} else {
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// If we aren't doing any tempo processing, simply passthrough the read signal
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read_count = ReverseAwareRead(data, maxlen);
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}
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return read_count;
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}
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qint64 AudioOutputDeviceProxy::writeData(const char *data, qint64 maxSize)
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{
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Q_UNUSED(data)
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Q_UNUSED(maxSize)
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return 0;
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}
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qint64 AudioOutputDeviceProxy::ReverseAwareRead(char *data, qint64 maxlen)
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{
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qint64 new_pos = -1;
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if (playback_speed_ < 0) {
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// If we're reversing, we'll seek back by maxlen bytes before we read
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qint64 len_adjusted_by_channels = maxlen / params_.channel_count();
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new_pos = device_->pos() - len_adjusted_by_channels;
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if (new_pos < 0) {
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maxlen = device_->pos() * params_.channel_count();
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new_pos = 0;
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}
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device_->seek(new_pos);
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}
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qint64 read_count = device_->read(data, maxlen);
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if (playback_speed_ < 0) {
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device_->seek(new_pos);
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// Reverse the samples here
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AudioManager::ReverseBuffer(data, static_cast<int>(read_count), params_.samples_to_bytes(1));
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}
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return read_count;
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}
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}
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