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fix required-sample count for cubic interpolation.

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I have not proved if the iterative process in
CubicInterpolation::interpolate() is identical to
(nframes * fabs(_actual_speed)), however ceil()
of it is empirically always larger.
Also, the cubic interpolation needs +2 samples.

Ardour3: Too close to call :)

git-svn-id: svn://localhost/ardour2/branches/3.0@13392 d708f5d6-7413-0410-9779-e7cbd77b26cf
This commit is contained in:
Robin Gareus 2012-11-07 03:17:55 +00:00
parent cb57b95480
commit a8cf2aa4f9
1 changed files with 1 additions and 1 deletions
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2
libs/ardour/audio_diskstream.cc
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@ -578,7 +578,7 @@ AudioDiskstream::process (framepos_t transport_frame, pframes_t nframes, framecn
/* no varispeed playback if we're recording, because the output .... TBD */
if (rec_nframes == 0 && _actual_speed != 1.0f) {
necessary_samples = (framecnt_t) floor ((nframes * fabs (_actual_speed))) + 1;
necessary_samples = (framecnt_t) ceil ((nframes * fabs (_actual_speed))) + 2;
} else {
necessary_samples = nframes;
}