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Remove delay when engaging record while rolling

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This commit is contained in:
Robin Gareus 2020-07-17 17:08:59 +02:00
parent 9242bc55a5
commit 6d6db90b60
Signed by: rgareus
GPG Key ID: A090BCE02CF57F04
1 changed files with 22 additions and 7 deletions
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29
libs/ardour/session.cc
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@ -1940,22 +1940,37 @@ Session::maybe_enable_record (bool rt_context)
g_atomic_int_set (&_record_status, Enabled);
/* This function is currently called from somewhere other than an RT thread.
* (except maybe lua scripts, which can use rt_context = true)
* This save_state() call therefore doesn't impact anything. Doing it here
* means that we save pending state of which sources the next record will use,
// TODO make configurable, perhaps capture-buffer-seconds dependnet?
bool quick_start = true;
/* Save pending state of which sources the next record will use,
* which gives us some chance of recovering from a crash during the record.
*/
if (!rt_context) {
if (!rt_context && (!quick_start || _transport_speed == 0)) {
save_state ("", true);
}
if (_transport_speed) {
if (_transport_speed != 0) {
maybe_allow_only_punch ();
if (!config.get_punch_in()) {
enable_record ();
}
/* When rolling, start recording immediately.
* Do not wait for .pending state save to complete
* because that may take some time (up to a second
* for huge sessions).
*
* This is potentially dangerous!! If a crash happens
* while recording before the .pending save completed,
* the data until then may be lost or overwritten.
* (However disk-writer buffers are usually longer,
* compared to the time it takes to save a session.
* disk I/O may not be a bottleneck either. Except
* perhaps plugin-state saves taking a lock.
*/
if (!rt_context && quick_start) {
save_state ("", true);
}
} else {
send_immediate_mmc (MIDI::MachineControlCommand (MIDI::MachineControl::cmdRecordPause));
RecordStateChanged (); /* EMIT SIGNAL */