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Song::processNextBuffer() - add more comments and rename variables with confusing names

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This commit is contained in:
M374LX
2015-03-18 22:02:21 -03:00
parent 043a565919
commit d308a72f29
1 changed files with 31 additions and 22 deletions
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53
src/core/Song.cpp
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@@ -199,14 +199,17 @@ void Song::savePos()
void Song::processNextBuffer()
{
// if not playing, nothing to do
if( m_playing == false )
{
return;
}
TrackList trackList;
int tcoNum = -1;
int tcoNum = -1; // track content object number
// determine the list of tracks to play and the track content object
// (TCO) number
switch( m_playMode )
{
case Mode_PlaySong:
@@ -247,6 +250,7 @@ void Song::processNextBuffer()
}
// if we have no tracks to play, nothing to do
if( trackList.empty() == true )
{
return;
@@ -259,6 +263,8 @@ void Song::processNextBuffer()
if( checkLoop )
{
// if looping-mode is enabled and we are outside of the looping
// range, go to the beginning of the range
if( m_playPos[m_playMode] < tl->loopBegin() ||
m_playPos[m_playMode] >= tl->loopEnd() )
{
@@ -269,16 +275,13 @@ void Song::processNextBuffer()
}
}
f_cnt_t totalFramesPlayed = 0;
f_cnt_t framesPlayed = 0;
const float framesPerTick = Engine::framesPerTick();
while( totalFramesPlayed < Engine::mixer()->framesPerPeriod() )
while( framesPlayed < Engine::mixer()->framesPerPeriod() )
{
m_vstSyncController.update();
f_cnt_t playedFrames = Engine::mixer()->framesPerPeriod() -
totalFramesPlayed;
float currentFrame = m_playPos[m_playMode].currentFrame();
// did we play a tick?
if( currentFrame >= framesPerTick )
@@ -335,6 +338,9 @@ void Song::processNextBuffer()
m_vstSyncController.startCycle(
tl->loopBegin().getTicks(), tl->loopEnd().getTicks() );
// if looping-mode is enabled and we have got
// past the looping range, return to the
// beginning of the range
if( m_playPos[m_playMode] >= tl->loopEnd() )
{
m_playPos[m_playMode].setTicks( tl->loopBegin().getTicks() );
@@ -353,23 +359,26 @@ void Song::processNextBuffer()
m_playPos[m_playMode].setCurrentFrame( currentFrame );
}
f_cnt_t lastFrames = ( f_cnt_t )framesPerTick -
( f_cnt_t )currentFrame;
f_cnt_t framesToPlay =
Engine::mixer()->framesPerPeriod() - framesPlayed;
f_cnt_t framesLeft = ( f_cnt_t )framesPerTick -
( f_cnt_t )currentFrame;
// skip last frame fraction
if( lastFrames == 0 )
if( framesLeft == 0 )
{
++totalFramesPlayed;
++framesPlayed;
m_playPos[m_playMode].setCurrentFrame( currentFrame
+ 1.0f );
continue;
}
// do we have some samples left in this tick but these are
// less then samples we have to play?
if( lastFrames < playedFrames )
// do we have samples left in this tick but these are less
// than samples we have to play?
if( framesLeft < framesToPlay )
{
// then set played_samples to remaining samples, the
// then set framesToPlay to remaining samples, the
// rest will be played in next loop
playedFrames = lastFrames;
framesToPlay = framesLeft;
}
if( ( f_cnt_t ) currentFrame == 0 )
@@ -378,25 +387,25 @@ void Song::processNextBuffer()
{
m_globalAutomationTrack->play(
m_playPos[m_playMode],
playedFrames,
totalFramesPlayed, tcoNum );
framesToPlay,
framesPlayed, tcoNum );
}
// loop through all tracks and play them
for( int i = 0; i < trackList.size(); ++i )
{
trackList[i]->play( m_playPos[m_playMode],
playedFrames,
totalFramesPlayed, tcoNum );
framesToPlay,
framesPlayed, tcoNum );
}
}
// update frame-counters
totalFramesPlayed += playedFrames;
m_playPos[m_playMode].setCurrentFrame( playedFrames +
framesPlayed += framesToPlay;
m_playPos[m_playMode].setCurrentFrame( framesToPlay +
currentFrame );
m_elapsedMilliSeconds +=
( ( playedFrames / framesPerTick ) * 60 * 1000 / 48 )
( ( framesToPlay / framesPerTick ) * 60 * 1000 / 48 )
/ getTempo();
m_elapsedTacts = m_playPos[Mode_PlaySong].getTact();
m_elapsedTicks = ( m_playPos[Mode_PlaySong].getTicks() % ticksPerTact() ) / 48;