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Timeline: Rework region fade in/out and declick logic. 

Closes #204
This commit is contained in:
Jonathan Moore Liles 2016-12-06 17:19:12 -08:00
parent a22f33f486
commit 754d113b0e
2 changed files with 88 additions and 32 deletions
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1
timeline/src/Audio_Region.C
View File

@ -131,6 +131,7 @@ Audio_Region::init ( void )
_color = FL_FOREGROUND_COLOR;
_box_color = FL_GRAY;
/* FIXME: shouldn't this be a fraction of the sample rate? */
_fade_in.length = 256;
_fade_in.type = Fade::Sigmoid;

117
timeline/src/Engine/Audio_Region.C
View File

@ -69,9 +69,15 @@ Audio_Region::Fade::apply_interleaved ( sample_t *buf, Audio_Region::Fade::fade_
const double inc = increment();
double fi = start / (double)length;
if ( n > length - start )
/* don't try to apply fade to more samples than specified by the fade length... */
n = length - start;
/* ASSERT( nframes < length - start, "Attempt to apply fade to more samples than its length" ); */
if ( dir == Fade::Out )
{
fi = 1.0f - fi;
fi = 1.0 - fi;
for ( ; n--; fi -= inc )
{
const float g = gain(fi);
@ -102,8 +108,13 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
const Range r = _range;
/* do nothing if we aren't covered by this frame range */
if ( pos > r.start + r.length || pos + nframes < r.start )
const nframes_t rS = r.start;
const nframes_t rE = r.start + r.length;
const nframes_t bS = pos;
const nframes_t bE = pos + nframes;
/* do nothing if region isn't inside buffer */
if ( bS > rE || bE < rS )
return 0;
sample_t *cbuf = NULL;
@ -122,29 +133,35 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
/* calculate offsets into file and sample buffer */
nframes_t sofs, /* offset into source */
ofs, /* offset into buffer */
nframes_t sO, /* offset into source */
bO, /* offset into buffer */
cnt; /* number of frames to read */
cnt = nframes;
if ( pos < r.start )
if ( bS < rS )
{
/* region starts somewhere after the beginning of this buffer */
sofs = 0;
ofs = r.start - pos;
cnt -= ofs;
/* beginning of region is inside buffer */
sO = 0;
bO = rS - bS;
// cnt -= bO;
}
else
{
/* region started before this buffer */
ofs = 0;
sofs = pos - r.start;
/* beginning of region precedes buffer */
bO = 0;
sO = bS - rS;
}
/* if region ends within this buffer, don't read beyond end */
if ( bE > rE )
cnt = nframes - ( bE - rE );
if ( bS < rS )
cnt = nframes - ( rS - bS );
// const nframes_t start = ofs + r.start + sofs;
const nframes_t start = r.offset + sofs;
/* const nframes_t start = r.offset + sO; */
const nframes_t len = cnt;
/* FIXME: keep the declick defults someplace else */
@ -153,12 +170,14 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
declick.length = (float)timeline->sample_rate() * 0.01f;
declick.type = Fade::Sigmoid;
if ( ofs >= nframes )
/* FIXME: what was this for? */
if ( bO >= nframes )
{
cnt = 0;
goto done;
}
/* FIXME: what was this for? */
if ( len == 0 )
{
cnt = 0;
@ -172,29 +191,30 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
if ( _loop )
{
nframes_t lofs = sofs % _loop;
nframes_t lofs = sO % _loop;
nframes_t lstart = r.offset + lofs;
/* FIXME: What if loop size is smaller than nframes? */
/* read interleaved channels */
if ( lofs + len > _loop )
{
/* this buffer covers a loop boundary */
/* read the first part */
cnt = _clip->read( cbuf + ( _clip->channels() * ofs ), -1, lstart, len - ( ( lofs + len ) - _loop ) );
cnt = _clip->read( cbuf + ( _clip->channels() * bO ), -1, lstart, len - ( ( lofs + len ) - _loop ) );
/* read the second part */
cnt += _clip->read( cbuf + ( _clip->channels() * ( ofs + cnt ) ), -1, lstart + cnt, len - cnt );
cnt += _clip->read( cbuf + ( _clip->channels() * ( bO + cnt ) ), -1, lstart + cnt, len - cnt );
assert( cnt == len );
}
else
cnt = _clip->read( cbuf + ( channels * ofs ), -1, lstart, len );
cnt = _clip->read( cbuf + ( channels * bO ), -1, lstart, len );
/* this buffer is inside declicking proximity to the loop boundary */
if ( lofs + cnt + declick.length > _loop /* buffer ends within declick length of the end of loop */
&&
sofs + declick.length < r.length /* not the last loop */
sO + declick.length < r.length /* not the last loop */
)
{
/* */
@ -213,14 +233,14 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
const nframes_t fl = cnt - declick_onset_offset;
declick.apply_interleaved( cbuf + ( _clip->channels() * ( ofs + declick_onset_offset ) ),
declick.apply_interleaved( cbuf + ( _clip->channels() * ( bO + declick_onset_offset ) ),
Fade::Out,
declick_offset, fl, _clip->channels() );
}
if ( lofs < declick.length /* buffer begins within declick length of beginning of loop */
&&
sofs > _loop ) /* not the first loop */
sO > _loop ) /* not the first loop */
{
const nframes_t declick_end = declick.length;
@ -228,11 +248,14 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
const nframes_t click_len = lofs + cnt > declick_end ? declick_end - lofs : cnt;
/* this is the beginning of the loop next boundary */
declick.apply_interleaved( cbuf + ( _clip->channels() * ofs ), Fade::In, lofs, click_len, _clip->channels() );
declick.apply_interleaved( cbuf + ( _clip->channels() * bO ), Fade::In, lofs, click_len, _clip->channels() );
}
}
else
cnt = _clip->read( cbuf + ( _clip->channels() * ofs ), -1, start, len );
{
// DMESSAGE("Clip read, rL=%lu, b0=%lu, sO=%lu, r.offset=%lu, len=%lu",r.length,bO,sO,r.offset,len);
cnt = _clip->read( cbuf + ( _clip->channels() * bO ), -1, sO + r.offset, len );
}
if ( ! cnt )
goto done;
@ -244,7 +267,8 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
* anyway */
buffer_apply_gain( cbuf, nframes * _clip->channels(), _scale );
/* perform declicking if necessary */
/* perform fade/declicking if necessary */
// if ( 0 )
{
assert( cnt <= nframes );
@ -253,14 +277,45 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
fade = declick < _fade_in ? _fade_in : declick;
/* do fade in if necessary */
if ( sofs < fade.length )
fade.apply_interleaved( cbuf + ( _clip->channels() * ofs ), Fade::In, sofs, cnt, _clip->channels() );
if ( sO < fade.length )
fade.apply_interleaved( cbuf + ( _clip->channels() * bO ), Fade::In, sO, cnt, _clip->channels() );
fade = declick < _fade_out ? _fade_out : declick;
/* do fade out if necessary */
if ( start + fade.length > r.offset + r.length )
fade.apply_interleaved( cbuf, Fade::Out, ( start + fade.length ) - ( r.offset + r.length ), cnt, _clip->channels() );
if ( sO + cnt + fade.length > r.length )
{
/* offset into fade */
nframes_t fsofs;
/* fade offset in buffer (on top of ofs) */
nframes_t fofs;
/* length of required fade segment */
nframes_t fcnt;
if ( sO + fade.length > r.length )
{
/* we're already into the fade */
/* fades can be longer than their regions... */
if ( fade.length > r.length )
fsofs = ( fade.length - r.length ) + sO;
else
fsofs = bS - ( rE - fade.length );
fofs = 0;
fcnt = cnt;
}
else
{
/* fade starts within this buffer */
fofs = ( rE - fade.length ) - bS;
fsofs = 0;
fcnt = cnt - fofs;
}
// DMESSAGE( "f.length=%lu, r.length=%lu, fsofs=%lu, fofs=%lu, fcnt=%lu, len=%lu", fade.length,r.length, fsofs, fofs, fcnt, len );
fade.apply_interleaved( cbuf + ( _clip->channels() * (bO + fofs ) ),
Fade::Out, fsofs, fcnt, _clip->channels() );
}
}
if ( buf != cbuf )