Use atomic read for an atomic variable
[ardour.git] / libs / ardour / audioengine.cc
index f215eaae82feda78346c4a8404bc94376013e0e2..e568603020ac74238628c761b7063d4c614168a6 100644 (file)
@@ -55,6 +55,7 @@
 #include "ardour/process_thread.h"
 #include "ardour/rc_configuration.h"
 #include "ardour/session.h"
+#include "ardour/transport_master_manager.h"
 
 #include "pbd/i18n.h"
 
@@ -77,7 +78,7 @@ AudioEngine::AudioEngine ()
        , _freewheeling (false)
        , monitor_check_interval (INT32_MAX)
        , last_monitor_check (0)
-       , _processed_frames (0)
+       , _processed_samples (-1)
        , m_meter_thread (0)
        , _main_thread (0)
        , _mtdm (0)
@@ -85,7 +86,7 @@ AudioEngine::AudioEngine ()
        , _measuring_latency (MeasureNone)
        , _latency_input_port (0)
        , _latency_output_port (0)
-       , _latency_flush_frames (0)
+       , _latency_flush_samples (0)
        , _latency_signal_latency (0)
        , _stopped_for_latency (false)
        , _started_for_latency (false)
@@ -155,7 +156,7 @@ AudioEngine::sample_rate_change (pframes_t nframes)
        last_monitor_check = 0;
 
        if (_session) {
-               _session->set_frame_rate (nframes);
+               _session->set_sample_rate (nframes);
        }
 
        SampleRateChanged (nframes); /* EMIT SIGNAL */
@@ -181,7 +182,7 @@ AudioEngine::buffer_size_change (pframes_t bufsiz)
 }
 
 /** Method called by our ::process_thread when there is work to be done.
- *  @param nframes Number of frames to process.
+ *  @param nframes Number of samples to process.
  */
 #ifdef __clang__
 __attribute__((annotate("realtime")))
@@ -190,19 +191,25 @@ int
 AudioEngine::process_callback (pframes_t nframes)
 {
        Glib::Threads::Mutex::Lock tm (_process_lock, Glib::Threads::TRY_LOCK);
+       Port::set_speed_ratio (1.0);
 
        PT_TIMING_REF;
        PT_TIMING_CHECK (1);
 
-       /// The number of frames that will have been processed when we've finished
-       pframes_t next_processed_frames;
+       /// The number of samples that will have been processed when we've finished
+       pframes_t next_processed_samples;
 
-       /* handle wrap around of total frames counter */
+       if (_processed_samples < 0) {
+               _processed_samples = sample_time();
+               cerr << "IIIIINIT PS to " << _processed_samples << endl;
+       }
+
+       /* handle wrap around of total samples counter */
 
-       if (max_framepos - _processed_frames < nframes) {
-               next_processed_frames = nframes - (max_framepos - _processed_frames);
+       if (max_samplepos - _processed_samples < nframes) {
+               next_processed_samples = nframes - (max_samplepos - _processed_samples);
        } else {
-               next_processed_frames = _processed_frames + nframes;
+               next_processed_samples = _processed_samples + nframes;
        }
 
        if (!tm.locked()) {
@@ -286,7 +293,7 @@ AudioEngine::process_callback (pframes_t nframes)
                PortManager::cycle_end (nframes);
                return_after_remove_check = true;
 
-       } else if (_latency_flush_frames) {
+       } else if (_latency_flush_samples) {
 
                /* wait for the appropriate duration for the MTDM signal to
                 * drain from the ports before we revert to normal behaviour.
@@ -296,10 +303,10 @@ AudioEngine::process_callback (pframes_t nframes)
                PortManager::silence (nframes);
                PortManager::cycle_end (nframes);
 
-               if (_latency_flush_frames > nframes) {
-                       _latency_flush_frames -= nframes;
+               if (_latency_flush_samples > nframes) {
+                       _latency_flush_samples -= nframes;
                } else {
-                       _latency_flush_frames = 0;
+                       _latency_flush_samples = 0;
                }
 
                return_after_remove_check = true;
@@ -345,25 +352,38 @@ AudioEngine::process_callback (pframes_t nframes)
                return 0;
        }
 
+       TransportMasterManager& tmm (TransportMasterManager::instance());
+
+       /* make sure the TMM is up to date about the current session */
+
+       if (_session != tmm.session()) {
+               tmm.set_session (_session);
+       }
+
        if (_session == 0) {
 
                if (!_freewheeling) {
-                       PortManager::cycle_start (nframes);
-                       PortManager::cycle_end (nframes);
+                       PortManager::silence_outputs (nframes);
                }
 
-               _processed_frames = next_processed_frames;
+               _processed_samples = next_processed_samples;
 
                return 0;
        }
 
+       if (!_freewheeling || Freewheel.empty()) {
+               const double engine_speed = tmm.pre_process_transport_masters (nframes, sample_time_at_cycle_start());
+               Port::set_speed_ratio (engine_speed);
+               DEBUG_TRACE (DEBUG::Slave, string_compose ("transport master (current=%1) gives speed %2 (ports using %3)\n", tmm.current() ? tmm.current()->name() : string("[]"), engine_speed, Port::speed_ratio()));
+       }
+
        /* tell all relevant objects that we're starting a new cycle */
 
        InternalSend::CycleStart (nframes);
 
        /* tell all Ports that we're starting a new cycle */
 
-       PortManager::cycle_start (nframes);
+       PortManager::cycle_start (nframes, _session);
 
        /* test if we are freewheeling and there are freewheel signals connected.
         * ardour should act normally even when freewheeling unless /it/ is
@@ -373,23 +393,35 @@ AudioEngine::process_callback (pframes_t nframes)
        if (_freewheeling && !Freewheel.empty()) {
                Freewheel (nframes);
        } else {
-               _session->process (nframes);
+               if (Port::cycle_nframes () <= nframes) {
+                       _session->process (Port::cycle_nframes ());
+               } else {
+                       pframes_t remain = Port::cycle_nframes ();
+                       while (remain > 0) {
+                               pframes_t nf = std::min (remain, nframes);
+                               _session->process (nf);
+                               remain -= nf;
+                               if (remain > 0) {
+                                       split_cycle (nf);
+                               }
+                       }
+               }
        }
 
        if (_freewheeling) {
-               PortManager::cycle_end (nframes);
+               PortManager::cycle_end (nframes, _session);
                return 0;
        }
 
        if (!_running) {
-               _processed_frames = next_processed_frames;
+               _processed_samples = next_processed_samples;
                return 0;
        }
 
-       if (last_monitor_check + monitor_check_interval < next_processed_frames) {
+       if (last_monitor_check + monitor_check_interval < next_processed_samples) {
 
                PortManager::check_monitoring ();
-               last_monitor_check = next_processed_frames;
+               last_monitor_check = next_processed_samples;
        }
 
 #ifdef SILENCE_AFTER_SECONDS
@@ -419,7 +451,7 @@ AudioEngine::process_callback (pframes_t nframes)
 
        if (session_remove_pending && session_removal_countdown) {
 
-               PortManager::fade_out (session_removal_gain, session_removal_gain_step, nframes);
+               PortManager::cycle_end_fade_out (session_removal_gain, session_removal_gain_step, nframes, _session);
 
                if (session_removal_countdown > nframes) {
                        session_removal_countdown -= nframes;
@@ -428,11 +460,11 @@ AudioEngine::process_callback (pframes_t nframes)
                }
 
                session_removal_gain -= (nframes * session_removal_gain_step);
+       } else {
+               PortManager::cycle_end (nframes, _session);
        }
 
-       PortManager::cycle_end (nframes);
-
-       _processed_frames = next_processed_frames;
+       _processed_samples = next_processed_samples;
 
        PT_TIMING_CHECK (2);
 
@@ -546,7 +578,7 @@ AudioEngine::do_devicelist_update()
 
        while (!_stop_hw_devicelist_processing) {
 
-               if (_hw_devicelist_update_count) {
+               if (g_atomic_int_get (&_hw_devicelist_update_count)) {
 
                        _devicelist_update_lock.unlock();
 
@@ -871,7 +903,7 @@ AudioEngine::start (bool for_latency)
                return 0;
        }
 
-       _processed_frames = 0;
+       _processed_samples = 0;
        last_monitor_check = 0;
 
        int error_code = _backend->start (for_latency);
@@ -884,7 +916,7 @@ AudioEngine::start (bool for_latency)
        _running = true;
 
        if (_session) {
-               _session->set_frame_rate (_backend->sample_rate());
+               _session->set_sample_rate (_backend->sample_rate());
 
                if (_session->config.get_jack_time_master()) {
                        _backend->set_time_master (true);
@@ -936,7 +968,13 @@ AudioEngine::stop (bool for_latency)
                pl.release ();
        }
 
-       if (_session && _running && stop_engine &&
+       const bool was_running_will_stop = (_running && stop_engine);
+
+       if (was_running_will_stop) {
+               _running = false;
+       }
+
+       if (_session && was_running_will_stop &&
            (_session->state_of_the_state() & Session::Loading) == 0 &&
            (_session->state_of_the_state() & Session::Deletion) == 0) {
                // it's not a halt, but should be handled the same way:
@@ -944,15 +982,14 @@ AudioEngine::stop (bool for_latency)
                _session->engine_halted ();
        }
 
-       if (stop_engine && _running) {
-               _running = false;
+       if (was_running_will_stop) {
                if (!for_latency) {
                        _started_for_latency = false;
                } else if (!_started_for_latency) {
                        _stopped_for_latency = true;
                }
        }
-       _processed_frames = 0;
+       _processed_samples = 0;
        _measuring_latency = MeasureNone;
        _latency_output_port = 0;
        _latency_input_port = 0;
@@ -999,16 +1036,6 @@ AudioEngine::is_realtime() const
        return _backend->is_realtime();
 }
 
-bool
-AudioEngine::connected() const
-{
-       if (!_backend) {
-               return false;
-       }
-
-       return _backend->available();
-}
-
 void
 AudioEngine::transport_start ()
 {
@@ -1037,7 +1064,7 @@ AudioEngine::transport_state ()
 }
 
 void
-AudioEngine::transport_locate (framepos_t pos)
+AudioEngine::transport_locate (samplepos_t pos)
 {
        if (!_backend) {
                return;
@@ -1045,16 +1072,16 @@ AudioEngine::transport_locate (framepos_t pos)
        return _backend->transport_locate (pos);
 }
 
-framepos_t
-AudioEngine::transport_frame()
+samplepos_t
+AudioEngine::transport_sample()
 {
        if (!_backend) {
                return 0;
        }
-       return _backend->transport_frame ();
+       return _backend->transport_sample ();
 }
 
-framecnt_t
+samplecnt_t
 AudioEngine::sample_rate () const
 {
        if (!_backend) {
@@ -1090,7 +1117,7 @@ AudioEngine::raw_buffer_size (DataType t)
        return _backend->raw_buffer_size (t);
 }
 
-framepos_t
+samplepos_t
 AudioEngine::sample_time ()
 {
        if (!_backend) {
@@ -1099,7 +1126,7 @@ AudioEngine::sample_time ()
        return _backend->sample_time ();
 }
 
-framepos_t
+samplepos_t
 AudioEngine::sample_time_at_cycle_start ()
 {
        if (!_backend) {
@@ -1267,7 +1294,7 @@ AudioEngine::thread_init_callback (void* arg)
 }
 
 int
-AudioEngine::sync_callback (TransportState state, framepos_t position)
+AudioEngine::sync_callback (TransportState state, samplepos_t position)
 {
        if (_session) {
                return _session->backend_sync_callback (state, position);
@@ -1452,7 +1479,7 @@ AudioEngine::start_latency_detection (bool for_midi)
        _latency_signal_latency += lr.max;
 
        /* all created and connected, lets go */
-       _latency_flush_frames = samples_per_cycle();
+       _latency_flush_samples = samples_per_cycle();
        _measuring_latency = for_midi ? MeasureMIDI : MeasureAudio;
 
        return 0;