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Timeline: Rework region loop and loop declick logic.

tags/non-daw-v1.2.0
Jonathan Moore Liles 8 years ago
parent
754d113b0e
commit
e7f4a1c4b9
1 changed files with 48 additions and 106 deletions
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  1. +48
    -106
      timeline/src/Engine/Audio_Region.C

+ 48
- 106
timeline/src/Engine/Audio_Region.C View File

@@ -96,6 +96,16 @@ Audio_Region::Fade::apply_interleaved ( sample_t *buf, Audio_Region::Fade::fade_
}
}

static
void
apply_fade ( sample_t *buf, const int channels, Audio_Region::Fade fade, const nframes_t bS, const nframes_t bE, const nframes_t edge, Audio_Region::Fade::fade_dir_e dir )
{
const nframes_t bSS = dir == Audio_Region::Fade::Out ? bS + fade.length : bS;
const nframes_t fade_start = bSS > edge ? bSS - edge : 0;
const nframes_t fade_offset = bSS > edge ? 0 : edge - bSS;
fade.apply_interleaved( buf + ( channels * fade_offset ), dir, fade_start, (bE - bS) - fade_offset, channels );
};

/** read the overlapping at /pos/ for /nframes/ of this region into
/buf/, where /pos/ is in timeline frames. /buf/ is an interleaved
@@ -133,35 +143,17 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t

/* calculate offsets into file and sample buffer */

nframes_t sO, /* offset into source */
bO, /* offset into buffer */
cnt; /* number of frames to read */

cnt = nframes;

if ( bS < rS )
{
/* beginning of region is inside buffer */
sO = 0;
bO = rS - bS;
// cnt -= bO;
}
else
{
/* beginning of region precedes buffer */
bO = 0;
sO = bS - rS;
}
const nframes_t sO = bS < rS ? 0 : bS - rS; /* offset into source */
const nframes_t bO = bS < rS ? rS - bS : 0; /* offset into buffer (when region start is after beginning of buffer) */
nframes_t cnt = nframes; /* number of frames to read */

/* 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 + sO; */
cnt -= bO;
const nframes_t len = cnt;

/* FIXME: keep the declick defults someplace else */
@@ -188,67 +180,49 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t

// printf( "reading region ofs = %lu, sofs = %lu, %lu-%lu\n", ofs, sofs, start, end );


if ( _loop )
{
nframes_t lofs = sO % _loop;
nframes_t lstart = r.offset + lofs;

/* FIXME: What if loop size is smaller than nframes? */
if ( _loop < nframes )
{
/* very small loop or very large buffer... */
WARNING("Loop size (%lu) is smaller than buffer size (%lu). Behavior undefined.", _loop, nframes );
}
const nframes_t lO = sO % _loop; /* how far we are into the loop */
const nframes_t nthloop = sO / _loop; /* which loop iteration */
const nframes_t seam_L = rS + ( nthloop * _loop ); /* receding seam */
const nframes_t seam_R = rS + ( (nthloop + 1 ) * _loop ); /* upcoming seam */
/* read interleaved channels */
if ( lofs + len > _loop )
if ( seam_R > bS && seam_R < bE )
{
/* this buffer covers a loop boundary */

/* read the first part */
cnt = _clip->read( cbuf + ( _clip->channels() * bO ), -1, lstart, len - ( ( lofs + len ) - _loop ) );
cnt = _clip->read( cbuf + ( _clip->channels() * bO ), -1, r.offset + lO, ( seam_R - bS ) - bO );
/* read the second part */
cnt += _clip->read( cbuf + ( _clip->channels() * ( bO + cnt ) ), -1, lstart + cnt, len - cnt );
cnt += _clip->read( cbuf + ( _clip->channels() * ( bO + cnt ) ), -1, r.offset + 0, ( len - cnt ) - bO );

assert( cnt == len );
/* assert( cnt == len ); */
}
else
cnt = _clip->read( cbuf + ( channels * bO ), -1, lstart, len );
/* buffer contains no loop seam, perform straight read. */
cnt = _clip->read( cbuf + ( _clip->channels() * bO ), -1, r.offset + lO, cnt );

/* 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 */
&&
sO + declick.length < r.length /* not the last loop */
)
for ( int i = 0; i < 2; i++ )
{
/* */
/* fixme: what if loop is shorter than declick? */
const nframes_t declick_start = _loop - declick.length;

/* when the buffer covers the beginning of the
* declick, how many frames between the beginning of
* the buffer and the beginning of the declick */
const nframes_t declick_onset_offset = declick_start > lofs ? declick_start - lofs : 0;

/* how far into the declick we are */
const nframes_t declick_offset = lofs > declick_start ? lofs - declick_start : 0;
nframes_t seam = i ? seam_R : seam_L;

/* this is the end side of the loop boundary */

const nframes_t fl = cnt - 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 */
&&
sO > _loop ) /* not the first loop */
{
const nframes_t declick_end = declick.length;
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() * bO ), Fade::In, lofs, click_len, _clip->channels() );
if ( seam != rS && seam != rE ) /* not either end of the region */
{
if ( seam >= bS && seam <= bE + declick.length )
/* fade out previous loop segment */
apply_fade( cbuf, _clip->channels(), declick, bS, bE, seam, Fade::Out );
if ( seam <= bE && seam + declick.length >= bS )
/* fade in next loop segment */
apply_fade( cbuf, _clip->channels(), declick, bS, bE, seam, Fade::In );
}
}
}
else
@@ -268,7 +242,6 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
buffer_apply_gain( cbuf, nframes * _clip->channels(), _scale );

/* perform fade/declicking if necessary */
// if ( 0 )
{
assert( cnt <= nframes );
@@ -278,44 +251,13 @@ Audio_Region::read ( sample_t *buf, bool buf_is_empty, nframes_t pos, nframes_t
/* do fade in if necessary */
if ( sO < fade.length )
fade.apply_interleaved( cbuf + ( _clip->channels() * bO ), Fade::In, sO, cnt, _clip->channels() );
apply_fade( cbuf, _clip->channels(), fade, bS, bE, rS, Fade::In );

fade = declick < _fade_out ? _fade_out : declick;
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() );
}

/* do fade out if necessary */
if ( sO + cnt + fade.length > r.length )
apply_fade( cbuf, _clip->channels(), fade, bS, bE, rE, Fade::Out );
}

if ( buf != cbuf )


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