* introduced dependency: libsmf-1.2

* extracted Interface from SMF: StandardMIDIFile
* first implementation of StandardMIDIFile based on libsmf that passes basic test


git-svn-id: svn://localhost/ardour2/branches/3.0@4529 d708f5d6-7413-0410-9779-e7cbd77b26cf

7 files changed, 318 insertions, 9 deletions

diff --git a/libs/evoral/evoral/LibSMF.hpp b/libs/evoral/evoral/LibSMF.hpp
new file mode 100644
index 0000000000..1bc50c8259
--- /dev/null
+++ b/libs/evoral/evoral/LibSMF.hpp
@@ -0,0 +1,84 @@
+/* This file is part of Evoral.
+ * Copyright(C) 2008 Dave Robillard <http://drobilla.net>
+ * Copyright(C) 2000-2008 Paul Davis
+ * Author: Hans Baier
+ * 
+ * Evoral is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or(at your option) any later
+ * version.
+ * 
+ * Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef EVORAL_LIB_SMF_HPP
+#define EVORAL_LIB_SMF_HPP
+
+#include "evoral/StandardMIDIFile.hpp"
+
+#include <smf.h>
+#include <cassert>
+
+namespace Evoral {
+	
+template<typename Time> class Event;
+template<typename Time> class EventRingBuffer;
+
+/** Standard Midi File (Type 0)
+ */
+template<typename Time>
+class LibSMF : public StandardMIDIFile<Time> {
+public:
+	LibSMF() : _last_ev_time(0), _smf(0), _smf_track(0), _empty(true) {};
+	virtual ~LibSMF() {	
+		if (_smf) {
+			smf_delete(_smf);
+			_smf = 0;
+			_smf_track = 0;
+		} 
+	}
+
+	void seek_to_start() const;
+	
+	uint16_t ppqn()     const { return _ppqn; }
+	bool     is_empty() const { return _empty; }
+	bool     eof()      const { assert(false); return true; }
+	
+	Time last_event_time() const { return _last_ev_time; }
+	
+	void begin_write(FrameTime start_time);
+	void append_event_unlocked(uint32_t delta_t, const Event<Time>& ev);
+	void end_write();
+	
+	void flush() {};
+	int  flush_header() { return 0; }
+	int  flush_footer() { return 0; }
+
+protected:
+	int  open(const std::string& path);
+	void close();
+	
+	int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const;
+
+private:
+	static const uint16_t _ppqn = 19200;
+	
+	Time     _last_ev_time; ///< last frame time written, relative to source start
+	
+	std::string  _path;
+	smf_t*       _smf;
+	smf_track_t* _smf_track;
+
+	bool         _empty; ///< true iff file contains(non-empty) events
+};
+
+}; /* namespace Evoral */
+
+#endif /* EVORAL_LIB_SMF_HPP */
+
diff --git a/libs/evoral/evoral/SMF.hpp b/libs/evoral/evoral/SMF.hpp
index a7a2abf4bf..313035f5e3 100644
--- a/libs/evoral/evoral/SMF.hpp
+++ b/libs/evoral/evoral/SMF.hpp
@@ -19,8 +19,7 @@
 #ifndef EVORAL_SMF_HPP
 #define EVORAL_SMF_HPP
 
-#include <string>
-#include "evoral/types.hpp"
+#include "evoral/StandardMIDIFile.hpp"
 
 namespace Evoral {
 	
@@ -31,7 +30,7 @@ template<typename Time> class EventRingBuffer;
 /** Standard Midi File (Type 0)
  */
 template<typename Time>
-class SMF {
+class SMF : public StandardMIDIFile<Time> {
 public:
 	SMF();
 	virtual ~SMF();
diff --git a/libs/evoral/evoral/StandardMIDIFile.hpp b/libs/evoral/evoral/StandardMIDIFile.hpp
new file mode 100644
index 0000000000..e907defe46
--- /dev/null
+++ b/libs/evoral/evoral/StandardMIDIFile.hpp
@@ -0,0 +1,64 @@
+/* This file is part of Evoral.
+ * Copyright(C) 2008 Dave Robillard <http://drobilla.net>
+ * Copyright(C) 2000-2008 Paul Davis 
+ * Author: Hans Baier
+ * 
+ * Evoral is free software; you can redistribute it and/or modify it under the
+ * terms of the GNU General Public License as published by the Free Software
+ * Foundation; either version 2 of the License, or(at your option) any later
+ * version.
+ * 
+ * Evoral is distributed in the hope that it will be useful, but WITHOUT ANY
+ * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
+ * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
+ * 
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef EVORAL_STANDARD_MIDI_FILE_HPP
+#define EVORAL_STANDARD_MIDI_FILE_HPP
+
+#include <string>
+#include "evoral/types.hpp"
+
+namespace Evoral {
+	
+template<typename Time> class Event;
+template<typename Time> class EventRingBuffer;
+
+
+/** Standard MIDI File interface
+ */
+template<typename Time>
+class StandardMIDIFile {
+public:
+	virtual void seek_to_start() const = 0;
+	
+	virtual uint16_t ppqn()     const = 0;
+	virtual bool     is_empty() const = 0;
+	virtual bool     eof()      const = 0;
+	
+	virtual Time last_event_time() const = 0;
+	
+	virtual void begin_write(FrameTime start_time) = 0;
+	virtual void append_event_unlocked(uint32_t delta_t, const Event<Time>& ev) = 0;
+	virtual void end_write() = 0;
+	
+	virtual void flush() = 0;
+	virtual int  flush_header() = 0;
+	virtual int  flush_footer() = 0;
+
+protected:
+	virtual int  open(const std::string& path) = 0;
+	virtual void close() = 0;
+	
+	virtual int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const = 0;
+
+};
+
+}; /* namespace Evoral */
+
+#endif /* EVORAL_STANDARD_MIDI_FILE_HPP */
+
diff --git a/libs/evoral/src/LibSMF.cpp b/libs/evoral/src/LibSMF.cpp
new file mode 100644
index 0000000000..c0c59fa3f0
--- /dev/null
+++ b/libs/evoral/src/LibSMF.cpp
@@ -0,0 +1,160 @@
+#include "evoral/LibSMF.hpp"
+#include "evoral/Event.hpp"
+#include <cassert>
+
+#include <iostream>
+
+using namespace std;
+
+namespace Evoral {
+
+
+/** Attempt to open the SMF file for reading and writing.
+ *
+ * Currently SMF is always read/write.
+ *
+ * \return  0 on success
+ *         -1 if the file can not be opened
+ */
+template<typename Time>
+int
+LibSMF<Time>::open(const std::string& path)
+{
+	if (_smf) { 
+		smf_delete(_smf);
+	}
+	
+	_smf = smf_load(path.c_str());
+	if (!_smf) {
+		_smf = smf_new();
+		smf_set_ppqn(_smf, _ppqn);
+		
+		if(_smf == NULL) {
+			return -1;
+		}
+	}
+		
+	_smf_track = smf_get_track_by_number(_smf, 1);
+	assert(_smf_track);
+
+	cerr << "number of events: " << _smf_track->number_of_events << endl;
+	
+	_empty = !(_smf_track->number_of_events > 0);
+	
+	return 0;
+}
+
+template<typename Time>
+void
+LibSMF<Time>::close()
+{
+	assert(false);
+	if (_smf) {
+		smf_save(_smf, _path.c_str());
+		smf_delete(_smf);
+		_smf = 0;
+		_smf_track = 0;
+	}
+}
+
+template<typename Time>
+void
+LibSMF<Time>::seek_to_start() const
+{
+	smf_rewind(_smf);
+}
+
+/** Read an event from the current position in file.
+ *
+ * File position MUST be at the beginning of a delta time, or this will die very messily.
+ * ev.buffer must be of size ev.size, and large enough for the event.  The returned event
+ * will have it's time field set to it's delta time, in SMF tempo-based ticks, using the
+ * rate given by ppqn() (it is the caller's responsibility to calculate a real time).
+ *
+ * \a size should be the capacity of \a buf.  If it is not large enough, \a buf will
+ * be freed and a new buffer allocated in its place, the size of which will be placed
+ * in size.
+ *
+ * Returns event length (including status byte) on success, 0 if event was
+ * skipped (eg a meta event), or -1 on EOF (or end of track).
+ */
+template<typename Time>
+int
+LibSMF<Time>::read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const
+{
+	smf_event_t *event;
+	
+	assert(delta_t);
+	assert(size);
+	assert(buf);
+	
+    if ((event = smf_get_next_event(_smf)) != NULL) {
+    	if (smf_event_is_metadata(event)) {
+    		return 0;
+    	}
+    	*delta_t = event->delta_time_pulses;
+    	
+    	int event_size = event->midi_buffer_length;
+    	assert(event_size > 0);
+    		
+    	// Make sure we have enough scratch buffer
+    	if (*size < (unsigned)event_size) {
+    		*buf = (uint8_t*)realloc(*buf, event_size);
+    	}
+    	memcpy(*buf, event->midi_buffer, size_t(event_size));
+    	*size = event_size;
+    	
+    	return event_size;
+    } else {
+    	return -1;
+    }
+}
+
+template<typename Time>
+void
+LibSMF<Time>::append_event_unlocked(uint32_t delta_t, const Event<Time>& ev)
+{
+	assert(ev.size() > 0);
+	
+	smf_event_t *event;
+
+	event = smf_event_new_from_pointer((void *) ev.buffer(), int(ev.size()));
+	assert(event != NULL);
+	
+	memcpy(event->midi_buffer, ev.buffer(), ev.size());
+	
+	assert(_smf_track);
+	smf_track_add_event_delta_pulses (_smf_track, event, int(delta_t));
+	_last_ev_time = ev.time();
+	
+	if (ev.size() > 0) {
+		_empty = false;
+	}
+}
+
+template<typename Time>
+void
+LibSMF<Time>::begin_write(FrameTime start_frame)
+{
+	assert(_smf_track);
+	smf_track_delete(_smf_track);
+	
+	_smf_track = smf_track_new();
+	assert(_smf_track);
+	
+	smf_add_track(_smf, _smf_track);
+	assert(_smf->number_of_tracks == 1);
+	
+	_last_ev_time = 0;
+}
+
+template<typename Time>
+void
+LibSMF<Time>::end_write()
+{
+	smf_save(_smf, _path.c_str());
+}
+
+template class LibSMF<double>;
+
+} // namespace Evoral
diff --git a/libs/evoral/test/SMFTest.cpp b/libs/evoral/test/SMFTest.cpp
index b5891ff23f..49233101cb 100644
--- a/libs/evoral/test/SMFTest.cpp
+++ b/libs/evoral/test/SMFTest.cpp
@@ -24,11 +24,11 @@ SMFTest::takeFiveTest ()
 	uint8_t* buf     = NULL;
 	int ret;
 	while ((ret = smf.read_event(&delta_t, &size, &buf)) >= 0) {
-		cerr << "read smf event type " << int(buf[0]) << endl;
 		ev.set(buf, size, 0.0);
 		time += delta_t;
 		
 		if (ret > 0) { // didn't skip (meta) event
+			cerr << "read smf event type " << hex << int(buf[0]) << endl;
 			// make ev.time absolute time in frames
 			ev.time() = time * frames_per_beat / (double)smf.ppqn();
 			ev.set_event_type(type_map->midi_event_type(buf[0]));
diff --git a/libs/evoral/test/SMFTest.hpp b/libs/evoral/test/SMFTest.hpp
index f63fec838a..99c3288f5a 100644
--- a/libs/evoral/test/SMFTest.hpp
+++ b/libs/evoral/test/SMFTest.hpp
@@ -1,7 +1,7 @@
 #include <cppunit/TestFixture.h>
 #include <cppunit/extensions/HelperMacros.h>
 
-#include <evoral/SMF.hpp>
+#include <evoral/LibSMF.hpp>
 
 #include "SequenceTest.hpp"
 
@@ -12,14 +12,14 @@
 using namespace Evoral;
 
 template<typename Time>
-class TestSMF : public SMF<Time> {
+class TestSMF : public LibSMF<Time> {
 public:
 	int  open(const std::string& path) {
-		return SMF<Time>::open(path);
+		return LibSMF<Time>::open(path);
 	}
 	
 	int read_event(uint32_t* delta_t, uint32_t* size, uint8_t** buf) const {
-		return SMF<Time>::read_event(delta_t, size, buf);
+		return LibSMF<Time>::read_event(delta_t, size, buf);
 	}
 };
 
diff --git a/libs/evoral/wscript b/libs/evoral/wscript
index 639c42b228..02a71b3f48 100644
--- a/libs/evoral/wscript
+++ b/libs/evoral/wscript
@@ -29,6 +29,7 @@ def configure(conf):
 	autowaf.check_pkg(conf, 'glibmm-2.4', uselib_store='GLIBMM', atleast_version='2.14.0', mandatory=True)
 	autowaf.check_pkg(conf, 'gthread-2.0', uselib_store='GTHREAD', atleast_version='2.14.0', mandatory=True)
 	autowaf.check_pkg(conf, 'cppunit', uselib_store='CPPUNIT', atleast_version='1.12.0', mandatory=False)
+	autowaf.check_pkg(conf, 'smf', uselib_store='SMF', atleast_version='1.2', mandatory=False)
 
 def build(bld):
 	# Headers
@@ -50,13 +51,14 @@ def build(bld):
 		src/Note.cpp
 		src/SMF.cpp
 		src/SMFReader.cpp
+		src/LibSMF.cpp
 		src/Sequence.cpp
 	'''
 	obj.export_incdirs = ['.']
 	obj.includes     = ['.', './src']
 	obj.name         = 'libevoral'
 	obj.target       = 'evoral'
-	obj.uselib       = 'GLIBMM GTHREAD'
+	obj.uselib       = 'GLIBMM GTHREAD SMF'
 	obj.vnum         = EVORAL_LIB_VERSION
 	obj.install_path = ''