diff options
Diffstat (limited to 'libs/ardour/audioregion.cc')
| -rw-r--r-- | libs/ardour/audioregion.cc | 53 |
1 files changed, 53 insertions, 0 deletions
diff --git a/libs/ardour/audioregion.cc b/libs/ardour/audioregion.cc index e217783760..4ba383b37e 100644 --- a/libs/ardour/audioregion.cc +++ b/libs/ardour/audioregion.cc @@ -1801,6 +1801,59 @@ AudioRegion::set_fade_out_is_xfade (bool yn) _fade_out_is_xfade = yn; } +framecnt_t +AudioRegion::verify_xfade_bounds (framecnt_t len, bool start) +{ + boost::shared_ptr<Playlist> pl (playlist()); + + if (!pl) { + /* not currently in a playlist - xfade length is unbounded + (and irrelevant) + */ + return len; + } + + boost::shared_ptr<RegionList> rl; + framecnt_t maxlen; + + if (start) { + rl = pl->regions_at (position()); + } else { + rl = pl->regions_at (last_frame()); + } + + RegionList::iterator i; + boost::shared_ptr<Region> other; + uint32_t n = 0; + + /* count and find the other region in a single pass through the list */ + + for (i = rl->begin(); i != rl->end(); ++i) { + if ((*i).get() != this) { + other = *i; + } + ++n; + } + + if (n != 2) { + /* zero or multiple regions stacked here - don't care about xfades */ + return len; + } + + /* we overlap a single region. clamp the length of an xfade to + the duration of the overlap. + */ + + if (start) { + maxlen = other->last_frame() - position(); + } else { + maxlen = last_frame() - other->position(); + } + + return min (maxlen, len); + +} + extern "C" { int region_read_peaks_from_c (void *arg, uint32_t npeaks, uint32_t start, uint32_t cnt, intptr_t data, uint32_t n_chan, double samples_per_unit) |