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authorPaul Davis <paul@linuxaudiosystems.com>2015-04-05 14:02:30 -0400
committerPaul Davis <paul@linuxaudiosystems.com>2015-04-05 14:02:30 -0400
commit8a5b5145cc8c7a1fcffdd8387f3f4cdc79af0911 (patch)
tree55c061e822fde35cd05658b37ae408b39ad25578 /libs/ardour/audioengine.cc
parentfbceec674af1bfee07816ec709773d56240bbff7 (diff)
add libardour code for going completely silent after a compile-time defined number of seconds
Diffstat (limited to 'libs/ardour/audioengine.cc')
-rw-r--r--libs/ardour/audioengine.cc53
1 files changed, 51 insertions, 2 deletions
diff --git a/libs/ardour/audioengine.cc b/libs/ardour/audioengine.cc
index 452403e485..1f878474f6 100644
--- a/libs/ardour/audioengine.cc
+++ b/libs/ardour/audioengine.cc
@@ -23,6 +23,7 @@
#include <exception>
#include <stdexcept>
#include <sstream>
+#include <cmath>
#include <glibmm/timer.h>
#include <glibmm/pattern.h>
@@ -63,6 +64,10 @@ using namespace PBD;
gint AudioEngine::m_meter_exit;
AudioEngine* AudioEngine::_instance = 0;
+#ifdef SILENCE_AFTER
+#define SILENCE_AFTER_SECONDS 10
+#endif
+
AudioEngine::AudioEngine ()
: session_remove_pending (false)
, session_removal_countdown (-1)
@@ -89,9 +94,14 @@ AudioEngine::AudioEngine ()
, _hw_devicelist_update_thread(0)
, _hw_devicelist_update_count(0)
, _stop_hw_devicelist_processing(0)
+#ifdef SILENCE_AFTER_SECONDS
+ , _silence_countdown (0)
+ , _silence_hit_cnt (0)
+#endif
{
g_atomic_int_set (&m_meter_exit, 0);
- start_hw_event_processing();
+ reset_silence_countdown ();
+ start_hw_event_processing();
discover_backends ();
}
@@ -148,6 +158,10 @@ AudioEngine::sample_rate_change (pframes_t nframes)
SampleRateChanged (nframes); /* EMIT SIGNAL */
+#ifdef SILENCE_AFTER_SECONDS
+ _silence_countdown = nframes * SILENCE_AFTER_SECONDS;
+#endif
+
return 0;
}
@@ -349,10 +363,31 @@ AudioEngine::process_callback (pframes_t nframes)
last_monitor_check = next_processed_frames;
}
+#ifdef SILENCE_AFTER_SECONDS
+
+ bool was_silent = (_silence_countdown == 0);
+
+ if (_silence_countdown >= nframes) {
+ _silence_countdown -= nframes;
+ } else {
+ _silence_countdown = 0;
+ }
+
+ if (!was_silent && _silence_countdown == 0) {
+ _silence_hit_cnt++;
+ BecameSilent (); /* EMIT SIGNAL */
+ }
+
+ if (_silence_countdown == 0 || _session->silent()) {
+ PortManager::silence (nframes);
+ }
+
+#else
if (_session->silent()) {
PortManager::silence (nframes);
}
-
+#endif
+
if (session_remove_pending && session_removal_countdown) {
PortManager::fade_out (session_removal_gain, session_removal_gain_step, nframes);
@@ -375,6 +410,19 @@ AudioEngine::process_callback (pframes_t nframes)
return 0;
}
+void
+AudioEngine::reset_silence_countdown ()
+{
+#ifdef SILENCE_AFTER_SECONDS
+ double sr = 48000; /* default in case there is no backend */
+
+ sr = sample_rate();
+
+ _silence_countdown = max (60 * sr, /* 60 seconds */
+ sr * (SILENCE_AFTER_SECONDS / pow (2, _silence_hit_cnt)));
+
+#endif
+}
void
AudioEngine::launch_device_control_app()
@@ -1081,6 +1129,7 @@ AudioEngine::set_sample_rate (float sr)
if (!_backend) {
return -1;
}
+
return _backend->set_sample_rate (sr);
}