enough with umpteen "i18n.h" files. Consolidate on pbd/i18n.h
[ardour.git] / libs / ardour / session_vst.cc
index c746a9d388d03d97a2c9575e1641a6211b8bca25..7b52b3cdf49b868073574ac5c70df6228e6fc7e0 100644 (file)
 #include <cstdio>
 
 #include "ardour/audioengine.h"
+#include "ardour/debug.h"
 #include "ardour/session.h"
 #include "ardour/tempo.h"
+#include "ardour/plugin_insert.h"
 #include "ardour/windows_vst_plugin.h"
 #include "ardour/vestige/aeffectx.h"
 #include "ardour/vst_types.h"
+#ifdef WINDOWS_VST_SUPPORT
+#include <fst.h>
+#endif
 
-#include "i18n.h"
+#include "pbd/i18n.h"
 
-#define DEBUG_CALLBACKS
-static int debug_callbacks = -1;
+using namespace ARDOUR;
 
-#ifdef DEBUG_CALLBACKS
-#define SHOW_CALLBACK if (debug_callbacks) printf
-#else
-#define SHOW_CALLBACK(...)
-#endif
+#define SHOW_CALLBACK(MSG) DEBUG_TRACE (PBD::DEBUG::VSTCallbacks, string_compose (MSG " val = %1 idx = %2\n", index, value))
 
-using namespace ARDOUR;
+static double
+vst_ppq (const TempoMetric& tm, const Timecode::BBT_Time& bbt, double& ppqBar)
+{
+
+       /* PPQ = pulse per quarter
+        * VST's "pulse" is our "division".
+        *
+        * 8 divisions per bar, 1 division = quarter, so 8 quarters per bar, ppq = 1
+        * 8 divisions per bar, 1 division = eighth, so  4 quarters per bar, ppq = 2
+        * 4 divisions per bar, 1 division = quarter, so  4 quarters per bar, ppq = 1
+        * 4 divisions per bar, 1 division = half, so 8 quarters per bar, ppq = 0.5
+        * 4 divisions per bar, 1 division = fifth, so (4 * 5/4) quarters per bar, ppq = 5/4
+        *
+        * general: divs_per_bar / (note_type / 4.0)
+        */
+       const double ppq_scaling =  tm.meter().note_divisor() / 4.0;
+
+       /* Note that this assumes constant meter/tempo throughout the session. Stupid VST */
+       ppqBar = double(bbt.bars - 1) * tm.meter().divisions_per_bar();
+       double ppqBeat = double(bbt.beats - 1);
+       double ppqTick = double(bbt.ticks) / Timecode::BBT_Time::ticks_per_beat;
+
+       ppqBar *= ppq_scaling;
+       ppqBeat *= ppq_scaling;
+       ppqTick *= ppq_scaling;
+
+       return ppqBar + ppqBeat + ppqTick;
+}
+
+int Session::vst_current_loading_id = 0;
+const char* Session::vst_can_do_strings[] = {
+       X_("supplyIdle"),
+       X_("sendVstTimeInfo"),
+       X_("sendVstEvents"),
+       X_("sendVstMidiEvent"),
+       X_("receiveVstEvents"),
+       X_("receiveVstMidiEvent"),
+       X_("supportShell"),
+       X_("shellCategory"),
+       X_("shellCategorycurID")
+};
+const int Session::vst_can_do_string_count = sizeof (vst_can_do_strings) / sizeof (char*);
 
 intptr_t Session::vst_callback (
        AEffect* effect,
@@ -51,145 +92,152 @@ intptr_t Session::vst_callback (
        float opt
        )
 {
-       static VstTimeInfo _timeInfo;
        VSTPlugin* plug;
        Session* session;
-
-       if (debug_callbacks < 0) {
-               debug_callbacks = (getenv ("ARDOUR_DEBUG_VST_CALLBACKS") != 0);
-       }
+       static VstTimeInfo _timeinfo; // only uses as fallback
+       VstTimeInfo* timeinfo;
+       int32_t newflags = 0;
 
        if (effect && effect->user) {
-               plug = (VSTPlugin *) (effect->user);
+               plug = (VSTPlugin *) (effect->user);
                session = &plug->session();
-#ifdef COMPILER_MSVC
-               SHOW_CALLBACK ("am callback 0x%x, opcode = %d, plugin = \"%s\" ", (int) pthread_self().p, opcode, plug->name());
-#else
-               SHOW_CALLBACK ("am callback 0x%x, opcode = %d, plugin = \"%s\" ", (int) pthread_self(), opcode, plug->name());
-#endif
+               timeinfo = plug->timeinfo ();
+               DEBUG_TRACE (PBD::DEBUG::VSTCallbacks, string_compose ("am callback 0x%1%2, opcode = %3%4, plugin = \"%5\"\n",
+                                       std::hex, (void*) DEBUG_THREAD_SELF,
+                                       std::dec, opcode, plug->name()));
        } else {
                plug = 0;
                session = 0;
-#ifdef COMPILER_MSVC
-               SHOW_CALLBACK ("am callback 0x%x, opcode = %d", (int) pthread_self().p, opcode);
-#else
-               SHOW_CALLBACK ("am callback 0x%x, opcode = %d", (int) pthread_self(), opcode);
-#endif
+               timeinfo = &_timeinfo;
+               DEBUG_TRACE (PBD::DEBUG::VSTCallbacks, string_compose ("am callback 0x%1%2, opcode = %3%4\n",
+                                       std::hex, (void*) DEBUG_THREAD_SELF,
+                                       std::dec, opcode));
        }
 
        switch(opcode){
 
        case audioMasterAutomate:
-               SHOW_CALLBACK ("amc: audioMasterAutomate\n");
+               SHOW_CALLBACK ("audioMasterAutomate");
                // index, value, returns 0
                if (plug) {
-                       plug->set_parameter (index, opt);
+                       plug->parameter_changed_externally (index, opt);
                }
                return 0;
 
        case audioMasterVersion:
-               SHOW_CALLBACK ("amc: audioMasterVersion\n");
+               SHOW_CALLBACK ("audioMasterVersion");
                // vst version, currently 2 (0 for older)
-               return 2;
+               return 2400;
 
        case audioMasterCurrentId:
-               SHOW_CALLBACK ("amc: audioMasterCurrentId\n");
-               // returns the unique id of a plug that's currently
-               // loading
-               return 0;
+               SHOW_CALLBACK ("audioMasterCurrentId");
+               // returns the unique id of a plug that's currently loading
+               return vst_current_loading_id;
 
        case audioMasterIdle:
-               SHOW_CALLBACK ("amc: audioMasterIdle\n");
-               // call application idle routine (this will
-               // call effEditIdle for all open editors too)
+               SHOW_CALLBACK ("audioMasterIdle");
+#ifdef WINDOWS_VST_SUPPORT
+               fst_audio_master_idle();
+#endif
                if (effect) {
                        effect->dispatcher(effect, effEditIdle, 0, 0, NULL, 0.0f);
                }
                return 0;
 
        case audioMasterPinConnected:
-               SHOW_CALLBACK ("amc: audioMasterPinConnected\n");
+               SHOW_CALLBACK ("audioMasterPinConnected");
                // inquire if an input or output is beeing connected;
                // index enumerates input or output counting from zero:
                // value is 0 for input and != 0 otherwise. note: the
                // return value is 0 for <true> such that older versions
                // will always return true.
+               if (!plug) {
+                       // we don't know.
+                       // but ardour always connects all buffers, so we're good
+                       return 0;
+               }
+               switch (value) {
+                       case 0:
+                               if (plug->plugin_insert ()) {
+                                       bool valid;
+                                       const ChanMapping& map (plug->plugin_insert ()->input_map (plug->plugin_number ()));
+                                       map.get (DataType::AUDIO, index, &valid);
+                                       return valid ? 0 : 1;
+                               }
+                               if (index < plug->plugin()->numInputs) {
+                                       return 0;
+                               }
+                               break;
+                       case 1:
+#if 0 // investigate, the outputs *are* connected to scratch buffers
+                               if (plug->plugin_insert ()) {
+                                       bool valid;
+                                       const ChanMapping& map (plug->plugin_insert ()->output_map (plug->plugin_number ()));
+                                       map.get (DataType::AUDIO, index, &valid);
+                                       return valid ? 0 : 1;
+                               }
+#endif
+                               if (index < plug->plugin()->numOutputs) {
+                                       return 0;
+                               }
+                               break;
+                       default:
+                               break;
+               }
                return 1;
 
        case audioMasterWantMidi:
-               SHOW_CALLBACK ("amc: audioMasterWantMidi\n");
+               SHOW_CALLBACK ("audioMasterWantMidi");
                // <value> is a filter which is currently ignored
-               if (plug) {
+               if (plug && plug->get_info() != NULL) {
                        plug->get_info()->n_inputs.set_midi (1);
                }
                return 0;
 
        case audioMasterGetTime:
-               SHOW_CALLBACK ("amc: audioMasterGetTime\n");
-               // returns const VstTimeInfo* (or 0 if not supported)
-               // <value> should contain a mask indicating which fields are required
-               // (see valid masks above), as some items may require extensive
-               // conversions
-               _timeInfo.flags = 0;
+               SHOW_CALLBACK ("audioMasterGetTime");
+               newflags = kVstNanosValid | kVstAutomationWriting | kVstAutomationReading;
 
-               if (session) {
-                       framepos_t now = session->transport_frame();
+               timeinfo->nanoSeconds = g_get_monotonic_time () * 1000;
+
+               if (plug && session) {
+                       framepos_t now = plug->transport_frame();
+
+                       timeinfo->samplePos = now;
+                       timeinfo->sampleRate = session->frame_rate();
 
-                       _timeInfo.samplePos = now;
-                       _timeInfo.sampleRate = session->frame_rate();
-                       
                        const TempoMetric& tm (session->tempo_map().metric_at (now));
 
                        if (value & (kVstTempoValid)) {
                                const Tempo& t (tm.tempo());
-                               _timeInfo.tempo = t.beats_per_minute ();
-                               _timeInfo.flags |= (kVstTempoValid);
+                               timeinfo->tempo = t.beats_per_minute ();
+                               newflags |= (kVstTempoValid);
                        }
                        if (value & (kVstTimeSigValid)) {
                                const Meter& m (tm.meter());
-                               _timeInfo.timeSigNumerator = m.divisions_per_bar ();
-                               _timeInfo.timeSigDenominator = m.note_divisor ();
-                               _timeInfo.flags |= (kVstTimeSigValid);
+                               timeinfo->timeSigNumerator = m.divisions_per_bar ();
+                               timeinfo->timeSigDenominator = m.note_divisor ();
+                               newflags |= (kVstTimeSigValid);
                        }
                        if ((value & (kVstPpqPosValid)) || (value & (kVstBarsValid))) {
                                Timecode::BBT_Time bbt;
 
                                try {
-                                       session->tempo_map().bbt_time_rt (now, bbt);
-                                       
-                                       /* PPQ = pulse per quarter
-                                          VST's "pulse" is our "division".
-
-                                          8 divisions per bar, 1 division = quarter, so 8 quarters per bar, ppq = 1
-                                          8 divisions per bar, 1 division = eighth, so  4 quarters per bar, ppq = 2
-                                          4 divisions per bar, 1 division = quarter, so  4 quarters per bar, ppq = 1
-                                          4 divisions per bar, 1 division = half, so 8 quarters per bar, ppq = 0.5
-                                          4 divisions per bar, 1 division = fifth, so (4 * 5/4) quarters per bar, ppq = 5/4
-                                          
-                                          general: divs_per_bar / (note_type / 4.0)
-                                       */
-                                       double ppq_scaling =  tm.meter().note_divisor() / 4.0;
-
-                                       /* Note that this assumes constant meter/tempo throughout the session. Stupid VST
-                                       */
-                                       double ppqBar = double(bbt.bars - 1) * tm.meter().divisions_per_bar();
-                                       double ppqBeat = double(bbt.beats - 1);
-                                       double ppqTick = double(bbt.ticks) / Timecode::BBT_Time::ticks_per_beat;
-
-                                       ppqBar *= ppq_scaling;
-                                       ppqBeat *= ppq_scaling;
-                                       ppqTick *= ppq_scaling;
-                                       
+                                       bbt = session->tempo_map().bbt_at_frame_rt (now);
+
+                                       double ppqBar;
+                                       double ppqPos = vst_ppq (tm, bbt, ppqBar);
+
                                        if (value & (kVstPpqPosValid)) {
-                                               _timeInfo.ppqPos = ppqBar + ppqBeat + ppqTick;
-                                               _timeInfo.flags |= (kVstPpqPosValid);
+                                               timeinfo->ppqPos = ppqPos;
+                                               newflags |= kVstPpqPosValid;
                                        }
-                                       
+
                                        if (value & (kVstBarsValid)) {
-                                               _timeInfo.barStartPos = ppqBar;
-                                               _timeInfo.flags |= (kVstBarsValid);
+                                               timeinfo->barStartPos = ppqBar;
+                                               newflags |= kVstBarsValid;
                                        }
-                                       
+
                                } catch (...) {
                                        /* relax */
                                }
@@ -197,65 +245,100 @@ intptr_t Session::vst_callback (
 
                        if (value & (kVstSmpteValid)) {
                                Timecode::Time t;
-                               
+
                                session->timecode_time (now, t);
-                               
-                               _timeInfo.smpteOffset = (t.hours * t.rate * 60.0 * 60.0) + 
-                                       (t.minutes * t.rate * 60.0) + 
-                                       (t.seconds * t.rate) + 
-                                       (t.frames) + 
+
+                               timeinfo->smpteOffset = (t.hours * t.rate * 60.0 * 60.0) +
+                                       (t.minutes * t.rate * 60.0) +
+                                       (t.seconds * t.rate) +
+                                       (t.frames) +
                                        (t.subframes);
 
-                               _timeInfo.smpteOffset *= 80.0; /* VST spec is 1/80th frames */
+                               timeinfo->smpteOffset *= 80.0; /* VST spec is 1/80th frames */
 
                                if (session->timecode_drop_frames()) {
                                        if (session->timecode_frames_per_second() == 30.0) {
-                                               _timeInfo.smpteFrameRate = 5;
+                                               timeinfo->smpteFrameRate = 5;
                                        } else {
-                                               _timeInfo.smpteFrameRate = 4; /* 29.97 assumed, thanks VST */
+                                               timeinfo->smpteFrameRate = 4; /* 29.97 assumed, thanks VST */
                                        }
                                } else {
                                        if (session->timecode_frames_per_second() == 24.0) {
-                                               _timeInfo.smpteFrameRate = 0;
+                                               timeinfo->smpteFrameRate = 0;
                                        } else if (session->timecode_frames_per_second() == 24.975) {
-                                               _timeInfo.smpteFrameRate = 2;
+                                               timeinfo->smpteFrameRate = 2;
                                        } else if (session->timecode_frames_per_second() == 25.0) {
-                                               _timeInfo.smpteFrameRate = 1;
+                                               timeinfo->smpteFrameRate = 1;
                                        } else {
-                                               _timeInfo.smpteFrameRate = 3; /* 30 fps */
+                                               timeinfo->smpteFrameRate = 3; /* 30 fps */
                                        }
                                }
-                               _timeInfo.flags |= (kVstSmpteValid);
+                               newflags |= (kVstSmpteValid);
+                       }
+
+                       if (session->actively_recording ()) {
+                               newflags |= kVstTransportRecording;
                        }
 
-                       if (session->transport_speed() != 0.0f) {
-                               _timeInfo.flags |= (kVstTransportPlaying);
+                       if (plug->transport_speed () != 0.0f) {
+                               newflags |= kVstTransportPlaying;
                        }
 
-                       if (session->get_play_loop()) {
+                       if (session->get_play_loop ()) {
+                               newflags |= kVstTransportCycleActive;
+                               Location * looploc = session->locations ()->auto_loop_location ();
+                               if (looploc) try {
+                                       double ppqBar;
+                                       Timecode::BBT_Time bbt;
+
+                                       bbt = session->tempo_map ().bbt_at_frame_rt (looploc->start ());
+                                       timeinfo->cycleStartPos = vst_ppq (tm, bbt, ppqBar);
+
+                                       bbt = session->tempo_map ().bbt_at_frame_rt (looploc->end ());
+                                       timeinfo->cycleEndPos = vst_ppq (tm, bbt, ppqBar);
+
+                                       newflags |= kVstCyclePosValid;
+                               } catch (...) { }
                        }
 
                } else {
-                       _timeInfo.samplePos = 0;
-                       _timeInfo.sampleRate = AudioEngine::instance()->sample_rate();
+                       timeinfo->samplePos = 0;
+                       timeinfo->sampleRate = AudioEngine::instance()->sample_rate();
                }
-               
-               return (intptr_t) &_timeInfo;
+
+               if ((timeinfo->flags & (kVstTransportPlaying | kVstTransportRecording | kVstTransportCycleActive))
+                   !=
+                   (newflags        & (kVstTransportPlaying | kVstTransportRecording | kVstTransportCycleActive)))
+               {
+                       newflags |= kVstTransportChanged;
+               }
+
+               timeinfo->flags = newflags;
+               return (intptr_t) timeinfo;
 
        case audioMasterProcessEvents:
-               SHOW_CALLBACK ("amc: audioMasterProcessEvents\n");
+               SHOW_CALLBACK ("audioMasterProcessEvents");
                // VstEvents* in <ptr>
+               if (plug && plug->midi_buffer()) {
+                       VstEvents* v = (VstEvents*)ptr;
+                       for (int n = 0 ; n < v->numEvents; ++n) {
+                               VstMidiEvent *vme = (VstMidiEvent*) (v->events[n]->dump);
+                               if (vme->type == kVstMidiType) {
+                                       plug->midi_buffer()->push_back(vme->deltaFrames, 3, (uint8_t*)vme->midiData);
+                               }
+                       }
+               }
                return 0;
 
        case audioMasterSetTime:
-               SHOW_CALLBACK ("amc: audioMasterSetTime\n");
+               SHOW_CALLBACK ("audioMasterSetTime");
                // VstTimenfo* in <ptr>, filter in <value>, not supported
 
        case audioMasterTempoAt:
-               SHOW_CALLBACK ("amc: audioMasterTempoAt\n");
+               SHOW_CALLBACK ("audioMasterTempoAt");
                // returns tempo (in bpm * 10000) at sample frame location passed in <value>
                if (session) {
-                       const Tempo& t (session->tempo_map().tempo_at (value));
+                       const Tempo& t (session->tempo_map().tempo_at_frame (value));
                        return t.beats_per_minute() * 1000;
                } else {
                        return 0;
@@ -263,23 +346,23 @@ intptr_t Session::vst_callback (
                break;
 
        case audioMasterGetNumAutomatableParameters:
-               SHOW_CALLBACK ("amc: audioMasterGetNumAutomatableParameters\n");
+               SHOW_CALLBACK ("audioMasterGetNumAutomatableParameters");
                return 0;
 
        case audioMasterGetParameterQuantization:
-               SHOW_CALLBACK ("amc: audioMasterGetParameterQuantization\n");
-               // returns the integer value for +1.0 representation,
-              // or 1 if full single float precision is maintained
-               // in automation. parameter index in <value> (-1: all, any)
+               SHOW_CALLBACK ("audioMasterGetParameterQuantization");
+               // returns the integer value for +1.0 representation,
+               // or 1 if full single float precision is maintained
+               // in automation. parameter index in <value> (-1: all, any)
                return 0;
 
        case audioMasterIOChanged:
-               SHOW_CALLBACK ("amc: audioMasterIOChanged\n");
-              // numInputs and/or numOutputs has changed
+               SHOW_CALLBACK ("audioMasterIOChanged");
+               // numInputs and/or numOutputs has changed
                return 0;
 
        case audioMasterNeedIdle:
-               SHOW_CALLBACK ("amc: audioMasterNeedIdle\n");
+               SHOW_CALLBACK ("audioMasterNeedIdle");
                // plug needs idle calls (outside its editor window)
                if (plug) {
                        plug->state()->wantIdle = 1;
@@ -287,48 +370,52 @@ intptr_t Session::vst_callback (
                return 0;
 
        case audioMasterSizeWindow:
-               SHOW_CALLBACK ("amc: audioMasterSizeWindow\n");
-               // index: width, value: height
+               SHOW_CALLBACK ("audioMasterSizeWindow");
+               if (plug && plug->state()) {
+                       plug->state()->width = index;
+                       plug->state()->height = value;
+                       plug->state()->want_resize = 1;
+               }
                return 0;
 
        case audioMasterGetSampleRate:
-               SHOW_CALLBACK ("amc: audioMasterGetSampleRate\n");
+               SHOW_CALLBACK ("audioMasterGetSampleRate");
                if (session) {
                        return session->frame_rate();
                }
                return 0;
 
        case audioMasterGetBlockSize:
-               SHOW_CALLBACK ("amc: audioMasterGetBlockSize\n");
+               SHOW_CALLBACK ("audioMasterGetBlockSize");
                if (session) {
                        return session->get_block_size();
                }
                return 0;
 
        case audioMasterGetInputLatency:
-               SHOW_CALLBACK ("amc: audioMasterGetInputLatency\n");
+               SHOW_CALLBACK ("audioMasterGetInputLatency");
                return 0;
 
        case audioMasterGetOutputLatency:
-               SHOW_CALLBACK ("amc: audioMasterGetOutputLatency\n");
+               SHOW_CALLBACK ("audioMasterGetOutputLatency");
                return 0;
 
        case audioMasterGetPreviousPlug:
-               SHOW_CALLBACK ("amc: audioMasterGetPreviousPlug\n");
-              // input pin in <value> (-1: first to come), returns cEffect*
+               SHOW_CALLBACK ("audioMasterGetPreviousPlug");
+               // input pin in <value> (-1: first to come), returns cEffect*
                return 0;
 
        case audioMasterGetNextPlug:
-               SHOW_CALLBACK ("amc: audioMasterGetNextPlug\n");
-              // output pin in <value> (-1: first to come), returns cEffect*
+               SHOW_CALLBACK ("audioMasterGetNextPlug");
+               // output pin in <value> (-1: first to come), returns cEffect*
 
        case audioMasterWillReplaceOrAccumulate:
-               SHOW_CALLBACK ("amc: audioMasterWillReplaceOrAccumulate\n");
-              // returns: 0: not supported, 1: replace, 2: accumulate
+               SHOW_CALLBACK ("audioMasterWillReplaceOrAccumulate");
+               // returns: 0: not supported, 1: replace, 2: accumulate
                return 0;
 
        case audioMasterGetCurrentProcessLevel:
-               SHOW_CALLBACK ("amc: audioMasterGetCurrentProcessLevel\n");
+               SHOW_CALLBACK ("audioMasterGetCurrentProcessLevel");
                // returns: 0: not supported,
                // 1: currently in user thread (gui)
                // 2: currently in audio thread (where process is called)
@@ -338,97 +425,102 @@ intptr_t Session::vst_callback (
                return 0;
 
        case audioMasterGetAutomationState:
-               SHOW_CALLBACK ("amc: audioMasterGetAutomationState\n");
+               SHOW_CALLBACK ("audioMasterGetAutomationState");
                // returns 0: not supported, 1: off, 2:read, 3:write, 4:read/write
                // offline
                return 0;
 
        case audioMasterOfflineStart:
-               SHOW_CALLBACK ("amc: audioMasterOfflineStart\n");
+               SHOW_CALLBACK ("audioMasterOfflineStart");
                return 0;
-               
+
        case audioMasterOfflineRead:
-               SHOW_CALLBACK ("amc: audioMasterOfflineRead\n");
-              // ptr points to offline structure, see below. return 0: error, 1 ok
+               SHOW_CALLBACK ("audioMasterOfflineRead");
+               // ptr points to offline structure, see below. return 0: error, 1 ok
                return 0;
 
        case audioMasterOfflineWrite:
-               SHOW_CALLBACK ("amc: audioMasterOfflineWrite\n");
+               SHOW_CALLBACK ("audioMasterOfflineWrite");
                // same as read
                return 0;
 
        case audioMasterOfflineGetCurrentPass:
-               SHOW_CALLBACK ("amc: audioMasterOfflineGetCurrentPass\n");
+               SHOW_CALLBACK ("audioMasterOfflineGetCurrentPass");
                return 0;
-               
+
        case audioMasterOfflineGetCurrentMetaPass:
-               SHOW_CALLBACK ("amc: audioMasterOfflineGetCurrentMetaPass\n");
+               SHOW_CALLBACK ("audioMasterOfflineGetCurrentMetaPass");
                return 0;
 
        case audioMasterSetOutputSampleRate:
-               SHOW_CALLBACK ("amc: audioMasterSetOutputSampleRate\n");
+               SHOW_CALLBACK ("audioMasterSetOutputSampleRate");
                // for variable i/o, sample rate in <opt>
                return 0;
 
        case audioMasterGetSpeakerArrangement:
-               SHOW_CALLBACK ("amc: audioMasterGetSpeakerArrangement\n");
+               SHOW_CALLBACK ("audioMasterGetSpeakerArrangement");
                // (long)input in <value>, output in <ptr>
                return 0;
 
        case audioMasterGetVendorString:
-               SHOW_CALLBACK ("amc: audioMasterGetVendorString\n");
+               SHOW_CALLBACK ("audioMasterGetVendorString");
                // fills <ptr> with a string identifying the vendor (max 64 char)
                strcpy ((char*) ptr, "Linux Audio Systems");
                return 0;
 
        case audioMasterGetProductString:
-               SHOW_CALLBACK ("amc: audioMasterGetProductString\n");
+               SHOW_CALLBACK ("audioMasterGetProductString");
                // fills <ptr> with a string with product name (max 64 char)
                strcpy ((char*) ptr, PROGRAM_NAME);
                return 0;
 
        case audioMasterGetVendorVersion:
-               SHOW_CALLBACK ("amc: audioMasterGetVendorVersion\n");
+               SHOW_CALLBACK ("audioMasterGetVendorVersion");
                // returns vendor-specific version
                return 900;
 
        case audioMasterVendorSpecific:
-               SHOW_CALLBACK ("amc: audioMasterVendorSpecific\n");
+               SHOW_CALLBACK ("audioMasterVendorSpecific");
                // no definition, vendor specific handling
                return 0;
 
        case audioMasterSetIcon:
-               SHOW_CALLBACK ("amc: audioMasterSetIcon\n");
+               SHOW_CALLBACK ("audioMasterSetIcon");
                // void* in <ptr>, format not defined yet
                return 0;
 
        case audioMasterCanDo:
-               SHOW_CALLBACK ("amc: audioMasterCanDo\n");
-               // string in ptr, see below
+               SHOW_CALLBACK ("audioMasterCanDo");
+               // string in ptr,  (const char*)ptr
+               for (int i = 0; i < vst_can_do_string_count; i++) {
+                       if (! strcmp(vst_can_do_strings[i], (const char*)ptr)) {
+                               return 1;
+                       }
+               }
                return 0;
 
        case audioMasterGetLanguage:
-               SHOW_CALLBACK ("amc: audioMasterGetLanguage\n");
+               SHOW_CALLBACK ("audioMasterGetLanguage");
                // see enum
                return 0;
 
        case audioMasterOpenWindow:
-               SHOW_CALLBACK ("amc: audioMasterOpenWindow\n");
+               SHOW_CALLBACK ("audioMasterOpenWindow");
                // returns platform specific ptr
                return 0;
 
        case audioMasterCloseWindow:
-               SHOW_CALLBACK ("amc: audioMasterCloseWindow\n");
+               SHOW_CALLBACK ("audioMasterCloseWindow");
                // close window, platform specific handle in <ptr>
                return 0;
 
        case audioMasterGetDirectory:
-               SHOW_CALLBACK ("amc: audioMasterGetDirectory\n");
+               SHOW_CALLBACK ("audioMasterGetDirectory");
                // get plug directory, FSSpec on MAC, else char*
                return 0;
 
        case audioMasterUpdateDisplay:
-               SHOW_CALLBACK ("amc: audioMasterUpdateDisplay\n");
+               SHOW_CALLBACK ("audioMasterUpdateDisplay");
                // something has changed, update 'multi-fx' display
                if (effect) {
                        effect->dispatcher(effect, effEditIdle, 0, 0, NULL, 0.0f);
@@ -436,25 +528,24 @@ intptr_t Session::vst_callback (
                return 0;
 
        case audioMasterBeginEdit:
-               SHOW_CALLBACK ("amc: audioMasterBeginEdit\n");
+               SHOW_CALLBACK ("audioMasterBeginEdit");
                // begin of automation session (when mouse down), parameter index in <index>
                return 0;
 
        case audioMasterEndEdit:
-               SHOW_CALLBACK ("amc: audioMasterEndEdit\n");
+               SHOW_CALLBACK ("audioMasterEndEdit");
                // end of automation session (when mouse up),     parameter index in <index>
                return 0;
 
        case audioMasterOpenFileSelector:
-               SHOW_CALLBACK ("amc: audioMasterOpenFileSelector\n");
+               SHOW_CALLBACK ("audioMasterOpenFileSelector");
                // open a fileselector window with VstFileSelect* in <ptr>
                return 0;
 
        default:
-               SHOW_CALLBACK ("VST master dispatcher: undefed: %d\n", opcode);
+               DEBUG_TRACE (PBD::DEBUG::VSTCallbacks, string_compose ("VST master dispatcher: undefed: %1\n", opcode));
                break;
        }
 
        return 0;
 }
-