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Implemented basic BPM mechanism

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This commit is contained in:
0xFEEDC0DE64
2020-04-29 19:48:41 +02:00
parent 2919ca2db6
commit 81cc81fe3a
18 changed files with 426 additions and 122 deletions
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21
audioplayer.cpp
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@ -24,7 +24,9 @@ void AudioPlayer::writeSamples(frame_t *begin, frame_t *end)
const auto speed = m_speed;
const auto buffer = m_buffer;
const auto volume = m_volume;
const auto stopOnEnd = m_stopOnEnd;
const auto &data = buffer.constData<frame_t>();
const auto loop = m_loop;
const auto frames = std::min<size_t>(std::distance(begin, end), buffer.frameCount()-position);
@ -38,18 +40,27 @@ void AudioPlayer::writeSamples(frame_t *begin, frame_t *end)
bool ended{};
std::transform(static_cast<const frame_t *>(begin), static_cast<const frame_t *>(begin+frames), begin,
[&](frame_t frame)->frame_t{
if (ended)
if (ended && stopOnEnd)
return frame;
const auto index = std::size_t(position);
if (index >= buffer.frameCount())
const auto index = std::ptrdiff_t(position);
position += speed;
if (loop)
{
if (speed < 0 && position < loop->first)
position = loop->second;
else if (speed > 0 && position > loop->second)
position = loop->first;
}
if ((speed < 0.f && index < 0) || (speed > 0.f && index >= buffer.frameCount()))
{
ended = true;
return frame;
}
const frame_t &frame2 = data[index];
position += speed;
std::transform(std::cbegin(frame), std::cend(frame), std::begin(frame2), std::begin(frame),
[&volume](const sample_t &left, const sample_t &right) { return left + (right*volume); });
@ -65,7 +76,7 @@ void AudioPlayer::writeSamples(frame_t *begin, frame_t *end)
m_lastPositionUpdate = now;
}
if (ended && m_stopOnEnd)
if (ended && stopOnEnd)
{
m_playing = false;
emit playingChanged(m_playing);