X-Git-Url: http://git.johnwright.org/?p=fmit.git;a=blobdiff_plain;f=libs%2FMusic%2Fomidistream.h;fp=libs%2FMusic%2Fomidistream.h;h=45102c677e62d4fdfec9aa6b444b177d2b6e6fcf;hp=0000000000000000000000000000000000000000;hb=49947d1cd4506f5574b3be62ee90e9f00227d9fd;hpb=82c9faab9421b3d87a0faa84a73f55aaccbbb689

diff --git a/libs/Music/omidistream.h b/libs/Music/omidistream.h
new file mode 100644
index 0000000..45102c6
--- /dev/null
+++ b/libs/Music/omidistream.h
@@ -0,0 +1,153 @@
+// Copyright 2004 "Gilles Degottex"
+
+// This file is part of "Music"
+
+// "Music" is free software; you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation; either version 2.1 of the License, or
+// (at your option) any later version.
+// 
+// "Music" 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 Lesser General Public License for more details.
+// 
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program; if not, write to the Free Software
+// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+
+
+#ifndef _omidistream_h_
+#define _omidistream_h_
+
+#include <string>
+#include <queue>
+#include <map>
+using namespace std;
+#include <alsa/asoundlib.h>
+
+namespace Music
+{
+	class omidistream;
+
+#define MIDI_TIME_DIRECT -1.0
+
+	//! a simple note (and an abstract one)
+	class note
+	{
+		friend class omidistream;
+	  public:	
+		static queue<unsigned char> s_free_tags;
+		static map<unsigned char, unsigned char> s_tags;
+
+	  protected:
+		static unsigned char getFreeTag();
+		static void addNote(unsigned char tag, unsigned char note)	{s_tags.insert(make_pair(tag, note));}
+		static unsigned char getNote(unsigned char tag)				{return (*(s_tags.find(tag))).second;}
+
+		snd_seq_event_t m_ev;
+
+		note(){}
+
+	  public:
+		//! unique ctor
+		/*! no direct send can be used ! TODO do it ...
+		 *
+		 * \param n the pitch [0,127]
+		 * \param duration duration of the note {seconds}
+		 * \param t absolute time when the note must be played {seconds}
+		 */
+		note(unsigned char n, double duration=1.0, double t=MIDI_TIME_DIRECT);
+
+		//! return the internal tag of the note
+		unsigned char getTag() const {return m_ev.tag;}
+	};
+
+	//! a starting note
+	class note_on : public note
+	{
+		friend class omidistream;
+		friend class note_off;
+
+	  public:
+		//! build a note on event
+		/*!
+		 * \param n the pitch [0,127]
+		 * \param t absolute time when the note must be played {seconds}
+		 * \param pTag pTage the returning unique identifier of the note
+		 */
+		note_on(unsigned char n, double t=MIDI_TIME_DIRECT);
+
+		//! build an empty note on event
+		note_on();
+	};
+
+	//! a ending note
+	class note_off : public note
+	{
+		friend class omidistream;
+
+	  public:
+		//! build a note off event from the on event
+		/*!
+		 * \param n_on the starting event
+		 * \param t absolute time when the note must be played {seconds}
+		 */
+		note_off(const note_on& n_on, double t=MIDI_TIME_DIRECT);
+	};
+
+	//! a midi stream for outputing notes in the midi alsa sequencer
+	/*! sample:\n\n
+	 *		omidistream str("test lib", 60);\n
+	 *		str << note(64, 0) << note(64, 0.5) << note(64, 1) << note(66, 1.5) << note(68, 2, 2) << note(66, 3, 2) << note(64, 4) << note(68, 4.5) << note(66, 5) << note(66, 5.5) << note(64, 6, 2) << drain;\n
+	 *     sleep(10);\n
+	 */
+	class omidistream
+	{
+		friend class note;
+
+		snd_seq_t* m_seq;
+		int m_queue;
+		int m_port;
+		unsigned char m_channel;
+		int m_A3Index;
+
+	  public:
+
+		//! unique ctor
+		/*!
+		 * \param name a name for the stream (shown in aconnect)
+		 * \param tempo the starting tempo of the whole stream {BPM (beats per minutes)}
+		 * \param channel midi channel where the note must be thrown [1,?]
+		 */
+		omidistream(std::string name, double tempo, unsigned char channel=1);
+
+		//! return the unique identifier of the alsa midi client
+		int getAlsaMidiID()				{return snd_seq_client_id(m_seq);}
+		
+		//! return the index of A3 in MIDI standard (69 by default)
+		int getA3Index()				{return m_A3Index;}
+
+		//! return the alsa midi port associated to the output sequencer
+		int getPort()					{return m_port;}
+
+		//! manualy flush the stream
+		omidistream& drain();
+
+		//! output a note in the stream
+		omidistream& operator<<(note n);
+		inline omidistream& operator<<(note_on n){return operator<<((note)n);}
+		inline omidistream& operator<<(note_off n){return operator<<((note)n);}
+
+		//! stream operator for modifiers
+		template<class Fn> omidistream& operator<<(Fn fn){fn(*this);return *this;}
+
+		~omidistream();
+	};
+
+	//! stream flushing modifier
+	omidistream& drain(omidistream& str);
+}
+
+#endif // _omidistream_h_
+