[Performous-commit] Lasse Kärkkäinen : Midi export support ( works on my computer).

[Lasse Kärkkäi. <tr...@us...>]

Author: Lasse Kärkkäinen <tronic+ndrm at trn.iki.fi>
Date:   Fri Feb 25 20:16:54 2011 +0100

Midi export support (works on my computer).

---

 songwriter-ini.cc |   62 +++++++++++++++++++++++++++++++++++++++++++++++++---
 1 files changed, 58 insertions(+), 4 deletions(-)

diff --git a/songwriter-ini.cc b/songwriter-ini.cc
index 526b135..aa394dd 100644
--- a/songwriter-ini.cc
+++ b/songwriter-ini.cc
@@ -1,17 +1,71 @@
 #include "songwriter.hh"
 
 #include "midifile.hh"
+#include "util.hh"
 #include <QTextStream>
 
-
 void FoFMIDIWriter::writeMIDI() const {
 	Notes const& notes = s.getVocalTrack().notes;
-	unsigned division = 16;
+	if (notes.empty()) throw std::runtime_error("No notes");
+	double tempo = s.bpm > 0 ? s.bpm : 120.0;
+	unsigned division = 64;  // Allow for very precise timing
+	unsigned endtc = round(tempo / 60.0 * division * notes.back().end);
 	midifile::Writer writer(1, 2, division);
+	using midifile::Event;
 	writer.startTrack();
-	// TODO: write timing info
+	Event ev;
+	ev.type = Event::SPECIAL;
+	ev.channel = 0x0F;
+	unsigned char buf[16];
+	ev.begin = ev.end = buf;
+	if (tempo != 120.0) {   // MIDI defaults to 120 BPM
+		ev.arg1 = Event::META_TEMPO;
+		ev.end = ev.begin + 3;
+		unsigned val = 6e+7 / tempo;  // Microseconds per beat
+		buf[0] = val >> 16;
+		buf[1] = val >> 8;
+		buf[2] = val;
+		writer.writeEvent(ev);
+	}
+	// TODO: write Performous Composer and title= & artist= like EoF does
+	ev.arg1 = Event::META_ENDOFTRACK;
+	writer.writeEvent(ev);
+	// Vocals track begins
 	writer.startTrack();
-	// TODO: write notes
+	// Write track name
+	ev.arg1 = Event::META_SEQNAME;
+	std::string partvocals = "PART VOCALS";
+	std::copy(partvocals.begin(), partvocals.end(), buf);
+	ev.end = ev.begin + partvocals.size();
+	writer.writeEvent(ev);
+	// Write notes
+	unsigned timecode = 0;
+	for (Notes::const_iterator it = notes.begin(), itend = notes.end(); it != itend; ++it) {
+		// Lyric
+		QByteArray bytes = it->syllable.toUtf8();
+		ev.timecode = round(tempo / 60.0 * division * it->begin) - timecode;
+		timecode += ev.timecode;
+		ev.type = Event::SPECIAL;
+		ev.channel = 0x0F;
+		ev.arg1 = Event::META_LYRIC;
+		ev.begin = reinterpret_cast<unsigned char*>(bytes.data());
+		ev.end = ev.begin + bytes.size();
+		writer.writeEvent(ev);
+		// Note begin
+		ev.channel = 0;
+		ev.timecode = 0;  // Same timecode as the lyric
+		ev.type = Event::NOTE_ON;
+		ev.arg1 = it->note;
+		ev.arg2 = 64;
+		writer.writeEvent(ev);
+		// Note end
+		ev.timecode = round(tempo / 60.0 * division * it->end) - timecode;
+		timecode += ev.timecode;
+		ev.type = Event::NOTE_OFF;
+		ev.arg2 = 0;
+		writer.writeEvent(ev);
+	}
+	// Write to file
 	QByteArray name = (path + "/notes.mid").toLocal8Bit();
 	writer.save(std::string(name.data(), name.size()).c_str());
 }