Function gmext_write_midi

src/Engine/GMCat.cpp:289–351

}

static int gmext_write_midi (const struct gmstream *stream,
	std::vector<unsigned char> &midi)
{
	// write MIDI file header
	static const unsigned char midi_file_signature[8] =
		{ 'M','T','h','d',0,0,0,6 };
	for (int i=0; i<8; ++i)
		midi.push_back(midi_file_signature[i]);
	gmext_write_int16(midi, 1);
	gmext_write_int16(midi, stream->ntracks + 1);
	gmext_write_int16(midi, 24);

	// write global tempo track
	static const unsigned char midi_track_header[8] =
		{ 'M','T','r','k',0,0,0,11 };
	for (int i=0; i<8; ++i)
		midi.push_back(midi_track_header[i]);
	gmext_write_delta(midi, 0);
	gmext_write_tempo_ev(midi, stream->tempo);
	gmext_write_delta(midi, 0);
	gmext_write_end_ev(midi);

	// write tracks
	for (int j=0; j<stream->ntracks; ++j) {

		// header
		for (int i=0; i<4; ++i)
			midi.push_back(midi_track_header[i]);

		size_t loffset = midi.size();
		for (int i=0; i<4; ++i)
			midi.push_back(0);

		// initial data
		static const unsigned char midi_track_init[8] =
			{ /* 0, 0xB0, */ 0x78, 0, 0, 0x79, 0, 0, 0x7B, 0 };
		midi.push_back(0);
		midi.push_back(0xB0 | stream->tracks[j].channel);
		for (int i=0; i<8; ++i)
			midi.push_back(midi_track_init[i]);

		// body
		struct output_status status = { 0, 0, 0 };
		if (gmext_write_sequence(midi, stream,
				stream->tracks[j].channel,
				&stream->tracks[j].seq, &status) == -1)
			return -1;

		// end of track
		gmext_write_delta(midi, status.delta);
		gmext_write_end_ev(midi);

		// rewrite track length
		unsigned char *p = &midi[loffset];
		size_t length = midi.size() - loffset - 4;
		p[0] = length >> 24;
		p[1] = length >> 16;
		p[2] = length >> 8;