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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 "audiowaveformview.h"
#include <QFile>
#include <QPainter>
#include <QtMath>
#include "common/clamp.h"
#include "config/config.h"
OLIVE_NAMESPACE_ENTER
AudioWaveformView::AudioWaveformView(QWidget *parent) :
SeekableWidget(parent),
playback_(nullptr)
{
setAutoFillBackground(true);
setBackgroundRole(QPalette::Base);
}
void AudioWaveformView::SetViewer(AudioPlaybackCache *playback)
{
if (playback_) {
disconnect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::ForceUpdate);
disconnect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::BackendParamsChanged);
SetTimebase(0);
}
playback_ = playback;
if (playback_) {
connect(playback_, &AudioPlaybackCache::Validated, this, &AudioWaveformView::ForceUpdate);
connect(playback_, &AudioPlaybackCache::ParametersChanged, this, &AudioWaveformView::BackendParamsChanged);
SetTimebase(playback_->GetParameters().time_base());
}
ForceUpdate();
}
void AudioWaveformView::paintEvent(QPaintEvent *event)
{
QWidget::paintEvent(event);
const AudioParams& params = playback_->GetParameters();
if (!playback_
|| playback_->GetCacheFilename().isEmpty()
|| !params.is_valid()) {
return;
}
if (cached_size_ != size()
|| cached_scale_ != GetScale()
|| cached_scroll_ != GetScroll()) {
cached_waveform_ = QPixmap(size());
cached_waveform_.fill(Qt::transparent);
QFile fs(playback_->GetCacheFilename());
if (fs.open(QFile::ReadOnly)) {
QPainter wave_painter(&cached_waveform_);
// FIXME: Hardcoded color
wave_painter.setPen(QColor(64, 255, 160));
int drew = 0;
fs.seek(params.samples_to_bytes(ScreenToUnitRounded(0)));
for (int x=0; x<width() && !fs.atEnd(); x++) {
int samples_len = ScreenToUnitRounded(x+1) - ScreenToUnitRounded(x);
int max_read_size = params.samples_to_bytes(samples_len);
QByteArray read_buffer = fs.read(max_read_size);
// Detect whether we've reached EOF and recalculate sample count if so
if (read_buffer.size() < max_read_size) {
samples_len = params.bytes_to_samples(read_buffer.size());
}
QVector<AudioVisualWaveform::SamplePerChannel> samples = AudioVisualWaveform::SumSamples(reinterpret_cast<const float*>(read_buffer.constData()),
samples_len,
params.channel_count());
for (int i=0;i<params.channel_count();i++) {
AudioVisualWaveform::DrawSample(&wave_painter, samples, x, 0, height());
drew++;
}
}
cached_size_ = size();
cached_scale_ = GetScale();
cached_scroll_ = GetScroll();
fs.close();
}
}
QPainter p(this);
// Draw in/out points
DrawTimelinePoints(&p);
// Draw cached waveform pixmap
p.drawPixmap(0, 0, cached_waveform_);
// Draw playhead
p.setPen(GetPlayheadColor());
int playhead_x = UnitToScreen(GetTime());
p.drawLine(playhead_x, 0, playhead_x, height());
}
void AudioWaveformView::BackendParamsChanged()
{
SetTimebase(playback_->GetParameters().time_base());
}
void AudioWaveformView::ForceUpdate()
{
cached_size_ = QSize();
update();
}
OLIVE_NAMESPACE_EXIT
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