allow to switch from/to dummy-backend

partos of this may become unnecessary once
libardour handles backend changes properly^Wdifferently.

diff --git a/libs/backends/dummy/dummy_audiobackend.cc b/libs/backends/dummy/dummy_audiobackend.cc
index bcf930665e565d7fcd0571312cf43997c51f68c0..fccf29170e8736b3714f8b8d02702f1c6ade9cd1 100644 (file)
--- a/libs/backends/dummy/dummy_audiobackend.cc
+++ b/libs/backends/dummy/dummy_audiobackend.cc
@@ -317,6 +317,7 @@ DummyAudioBackend::_start (bool /*for_latency_measurement*/)
                return -1;
        }
 
+       engine.buffer_size_change (_samples_per_period);
        engine.reconnect_ports ();
 
        if (pthread_create (&_main_thread, NULL, pthread_process, this)) {
@@ -339,7 +340,7 @@ DummyAudioBackend::stop ()
 {
        void *status;
        if (!_running) {
-               return -1;
+               return 0;
        }
 
        _running = false;
@@ -844,14 +845,14 @@ DummyAudioBackend::midi_event_put (
 uint32_t
 DummyAudioBackend::get_midi_event_count (void* port_buffer)
 {
-       assert (port_buffer && _running);
+       assert (port_buffer);
        return static_cast<DummyMidiBuffer*>(port_buffer)->size ();
 }
 
 void
 DummyAudioBackend::midi_clear (void* port_buffer)
 {
-       assert (port_buffer && _running);
+       assert (port_buffer);
        DummyMidiBuffer * buf = static_cast<DummyMidiBuffer*>(port_buffer);
        assert (buf);
        buf->clear ();
@@ -988,7 +989,7 @@ DummyAudioBackend::n_physical_inputs () const
 void*
 DummyAudioBackend::get_buffer (PortEngine::PortHandle port, pframes_t nframes)
 {
-       assert (port && _running);
+       assert (port);
        assert (valid_port (port));
        return static_cast<DummyPort*>(port)->get_buffer (nframes);
 }