diff options
| author | Robin Gareus <robin@gareus.org> | 2017-10-29 18:30:18 +0100 |
|---|---|---|
| committer | Robin Gareus <robin@gareus.org> | 2017-10-29 20:04:00 +0100 |
| commit | 927788a0b0bf6a621e7cee60365f4e8cbd67d829 (patch) | |
| tree | 43ebe89319b4b9416391f2f195dbc4f8effad161 /libs/ardour/session.cc | |
| parent | 7fb3c3e137d7a96998f21a4ec275339b4bc08c1a (diff) | |
Move vari-speed into backend (resample ports)
Previously Ardour used a /local/ per track vari-speed mechanism.
Now that the disk-reader is a latency-compensated processor, the speed
of each disk-reader would need to be maintained locally, offset by each
disk-reader's output latency. Furthermore each disk-reader may
produce a different number of samples, depending on its global alignment.
This commit introduces port-data resampling directly at the engine-level:
Up/down-sample all input ports at the beginning, and down/up-sample output
port-data using the inverse ratio at the end of the session's process
cycle.
The session itself is unaware of the speed-change, and only needs to
handle transport speeds {-1, 0, +1}.
This also allows for aligned cue-monitoring and vari-speed recording,
and also pitch-shifts synthesized MIDI along.
Diffstat (limited to 'libs/ardour/session.cc')
| -rw-r--r-- | libs/ardour/session.cc | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/libs/ardour/session.cc b/libs/ardour/session.cc index aad0fefdd9..0bfc5d97ca 100644 --- a/libs/ardour/session.cc +++ b/libs/ardour/session.cc @@ -187,6 +187,7 @@ Session::Session (AudioEngine &eng, , _slave (0) , _silent (false) , _remaining_latency_preroll (0) + , _engine_speed (1.0) , _transport_speed (0) , _default_transport_speed (1.0) , _last_transport_speed (0) |