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Clarify the logic for drop of channels during playback

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This commit is contained in:
Paul Licameli 2018-09-20 14:02:24 -04:00
parent 35f5555216
commit bba16b3b37
1 changed files with 30 additions and 67 deletions
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97
src/AudioIO.cpp
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@ -4872,47 +4872,31 @@ int AudioIO::AudioCallback(const void *inputBuffer, void *outputBuffer,
numSolo++;
#endif
// MOVE_TO: CountDroppedTracks() function
bool dropAllQuickly = true; //i.e. drop all channels, without any fade out.
for (unsigned t = 0; t < numPlaybackTracks; t++)
{
WaveTrack *vt = mPlaybackTracks[t].get();
bool drop = false;
bool dropQuickly = false;
bool linkFlag = false;
if (linkFlag) {
linkFlag = false;
if (vt->GetChannelIgnoringPan() == Track::LeftChannel)
dropQuickly = dropQuickly && (vt->GetOldChannelGain(0) == 0.0);
if (vt->GetChannelIgnoringPan() == Track::RightChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(1) == 0.0);
}
else {
drop = mPaused;
dropQuickly = false;
auto dropTrack = [&] ( const WaveTrack &wt ) {
return mPaused || (!wt.GetSolo() && (
// Cut if somebody else is soloing
if (numSolo>0 && !vt->GetSolo())
drop = true;
numSolo > 0 ||
// Cut if we're muted (and not soloing)
wt.GetMute()
));
};
// Cut if we're muted (unless we're soloing)
if (vt->GetMute() && !vt->GetSolo())
drop = true;
auto doneMicrofading = [&] ( const WaveTrack &wt ) {
const auto channel = wt.GetChannelIgnoringPan();
if ((channel == Track::LeftChannel || channel == Track::MonoChannel) &&
wt.GetOldChannelGain(0) != 0.0)
return false;
if ((channel == Track::RightChannel || channel == Track::MonoChannel) &&
wt.GetOldChannelGain(1) != 0.0)
return false;
return true;
};
linkFlag = vt->GetLinked();
dropQuickly = drop;
if (vt->GetChannelIgnoringPan() == Track::LeftChannel ||
vt->GetChannelIgnoringPan() == Track::MonoChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(0) == 0.0);
if (vt->GetChannelIgnoringPan() == Track::RightChannel ||
vt->GetChannelIgnoringPan() == Track::MonoChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(1) == 0.0);
}
dropAllQuickly = dropAllQuickly && dropQuickly;
}
const bool dropAllQuickly = std::all_of(
mPlaybackTracks.begin(), mPlaybackTracks.end(),
[&]( const std::shared_ptr< WaveTrack > &vt )
{ return dropTrack( *vt ) && doneMicrofading( *vt ); }
);
// This is a quick route, when paused and already at zero level on all channels.
// However, we always fade-out into a pause, hence the 'dropAllQuickly' test
@ -4960,9 +4944,6 @@ int AudioIO::AudioCallback(const void *inputBuffer, void *outputBuffer,
// - Applying a linearly interpolated gain.
// I would expect us not to need the fast paths, since linearly interpolated gain
// is very cheap to process.
bool drop = false;
bool dropQuickly = false;
bool linkFlag = false;
float *outputFloats = (float *)outputBuffer;
for( unsigned i = 0; i < framesPerBuffer*numPlaybackChannels; i++)
@ -5009,50 +4990,32 @@ int AudioIO::AudioCallback(const void *inputBuffer, void *outputBuffer,
const auto toGet =
std::min<size_t>(framesPerBuffer, GetCommonlyReadyPlayback());
bool drop = false;
bool dropQuickly = false;
bool linkFlag = false;
for (unsigned t = 0; t < numPlaybackTracks; t++)
{
WaveTrack *vt = mPlaybackTracks[t].get();
chans[chanCnt] = vt;
if (linkFlag) {
if ( linkFlag ) {
linkFlag = false;
if (vt->GetChannelIgnoringPan() == Track::LeftChannel)
dropQuickly = dropQuickly && (vt->GetOldChannelGain(0) == 0.0);
if (vt->GetChannelIgnoringPan() == Track::RightChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(1) == 0.0);
dropQuickly = dropQuickly && doneMicrofading( *vt );
}
else {
drop = mPaused;
dropQuickly = false;
// Cut if somebody else is soloing
if (numSolo>0 && !vt->GetSolo())
drop = true;
// Cut if we're muted (unless we're soloing)
if (vt->GetMute() && !vt->GetSolo())
drop = true;
drop = dropTrack( *vt );
linkFlag = vt->GetLinked();
selected = vt->GetSelected();
// If we have a mono track, clear the right channel
if (!linkFlag)
{
memset(tempBufs[1], 0, framesPerBuffer * sizeof(float));
}
dropQuickly = drop;
if (vt->GetChannelIgnoringPan() == Track::LeftChannel ||
vt->GetChannelIgnoringPan() == Track::MonoChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(0) == 0.0);
if (vt->GetChannelIgnoringPan() == Track::RightChannel ||
vt->GetChannelIgnoringPan() == Track::MonoChannel )
dropQuickly = dropQuickly && (vt->GetOldChannelGain(1) == 0.0);
dropQuickly = drop && doneMicrofading( *vt );
}
#define ORIGINAL_DO_NOT_PLAY_ALL_MUTED_TRACKS_TO_END
#ifdef ORIGINAL_DO_NOT_PLAY_ALL_MUTED_TRACKS_TO_END
decltype(framesPerBuffer) len = 0;