mirror of
https://git.femboyfinancial.jp/james/lipsync.git
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283 lines
11 KiB
C#
283 lines
11 KiB
C#
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/*
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* MidiEvent.cs
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* Copyright (c) 2009 kbinani
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*
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* This file is part of Boare.Lib.Vsq.
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*
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* Boare.Lib.Vsq is free software; you can redistribute it and/or
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* modify it under the terms of the BSD License.
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*
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* Boare.Lib.Vsq is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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*/
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#if JAVA
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package org.kbinani.vsq;
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import java.io.*;
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import org.kbinani.*;
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#else
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using System;
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using bocoree;
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using bocoree.java.io;
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namespace Boare.Lib.Vsq {
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using boolean = System.Boolean;
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using Long = System.Int64;
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#endif
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/// <summary>
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/// midiイベント。メタイベントは、メタイベントのデータ長をData[1]に格納せず、生のデータをDataに格納するので、注意が必要
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/// </summary>
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#if JAVA
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public class MidiEvent implements Comparable<MidiEvent> {
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#else
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public struct MidiEvent : IComparable<MidiEvent> {
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#endif
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public long clock;
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public byte firstByte;
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public byte[] data;
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private static void writeDeltaClock( RandomAccessFile stream, long number )
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#if JAVA
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throws IOException
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#endif
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{
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boolean[] bits = new boolean[64];
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long val = 0x1;
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bits[0] = (number & val) == val;
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for ( int i = 1; i < 64; i++ ) {
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val = val << 1;
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bits[i] = (number & val) == val;
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}
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int first = 0;
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for ( int i = 63; i >= 0; i-- ) {
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if ( bits[i] ) {
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first = i;
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break;
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}
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}
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// 何バイト必要か？
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int bytes = first / 7 + 1;
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for ( int i = 1; i <= bytes; i++ ) {
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long num = 0;
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long count = 0x80;
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for ( int j = (bytes - i + 1) * 7 - 1; j >= (bytes - i + 1) * 7 - 6 - 1; j-- ) {
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count = count >> 1;
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if ( bits[j] ) {
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num += count;
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}
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}
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if ( i != bytes ) {
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num += 0x80;
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}
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stream.write( (byte)num );
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}
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}
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private static long readDeltaClock( RandomAccessFile stream )
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#if JAVA
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throws IOException
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#endif
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{
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long ret = 0;
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while ( true ) {
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int i = stream.read();
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if ( i < 0 ) {
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break;
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}
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byte d = (byte)i;
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ret = (ret << 7) | ((long)d & 0x7f);
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if ( (d & 0x80) == 0x00 ) {
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break;
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}
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}
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return ret;
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}
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public static MidiEvent read( RandomAccessFile stream, ByRef<Long> last_clock, ByRef<Byte> last_status_byte )
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#if JAVA
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throws IOException, Exception
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#endif
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{
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long delta_clock = readDeltaClock( stream );
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last_clock.value += delta_clock;
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byte first_byte = (byte)stream.read();
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if ( first_byte < 0x80 ) {
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// ランニングステータスが適用される
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long pos = stream.getFilePointer();
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stream.seek( pos - 1 );
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first_byte = last_status_byte.value;
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} else {
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last_status_byte.value = first_byte;
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}
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byte ctrl = (byte)(first_byte & (byte)0xf0);
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if ( ctrl == 0x80 || ctrl == 0x90 || ctrl == 0xA0 || ctrl == 0xB0 || ctrl == 0xE0 || first_byte == 0xF2 ) {
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// 3byte使用するチャンネルメッセージ：
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// 0x8*: ノートオフ
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// 0x9*: ノートオン
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// 0xA*: ポリフォニック・キープレッシャ
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// 0xB*: コントロールチェンジ
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// 0xE*: ピッチベンドチェンジ
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// 3byte使用するシステムメッセージ
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// 0xF2: ソングポジション・ポインタ
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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me.data = new byte[2];
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stream.read( me.data, 0, 2 );
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return me;
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} else if ( ctrl == 0xC0 || ctrl == 0xD0 || first_byte == 0xF1 || first_byte == 0xF2 ) {
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// 2byte使用するチャンネルメッセージ
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// 0xC*: プログラムチェンジ
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// 0xD*: チャンネルプレッシャ
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// 2byte使用するシステムメッセージ
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// 0xF1: クォータフレーム
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// 0xF3: ソングセレクト
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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me.data = new byte[1];
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stream.read( me.data, 0, 1 );
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return me;
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} else if ( first_byte == 0xF6 ) {
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// 1byte使用するシステムメッセージ
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// 0xF6: チューンリクエスト
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// 0xF7: エンドオブエクスクルーシブ（このクラスではF0ステータスのSysExの一部として取り扱う）
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// 0xF8: タイミングクロック
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// 0xFA: スタート
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// 0xFB: コンティニュー
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// 0xFC: ストップ
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// 0xFE: アクティブセンシング
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// 0xFF: システムリセット
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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me.data = new byte[0];
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return me;
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} else if ( first_byte == 0xff ) {
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// メタイベント
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byte meta_event_type = (byte)stream.read();
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long meta_event_length = readDeltaClock( stream );
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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me.data = new byte[(int)meta_event_length + 1];
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me.data[0] = meta_event_type;
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stream.read( me.data, 1, (int)meta_event_length );
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return me;
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} else if ( first_byte == 0xf0 ) {
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// f0ステータスのSysEx
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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long sysex_length = readDeltaClock( stream );
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me.data = new byte[(int)sysex_length + 1];
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stream.read( me.data, 0, (int)(sysex_length + 1) );
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return me;
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} else if ( first_byte == 0xf7 ) {
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// f7ステータスのSysEx
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MidiEvent me = new MidiEvent();
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me.clock = last_clock.value;
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me.firstByte = first_byte;
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long sysex_length = readDeltaClock( stream );
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me.data = new byte[(int)sysex_length];
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stream.read( me.data, 0, (int)sysex_length );
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return me;
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} else {
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throw new Exception( "don't know how to process first_byte: 0x" + PortUtil.toHexString( first_byte ) );
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}
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}
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public void writeData( RandomAccessFile stream )
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#if JAVA
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throws IOException
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#endif
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{
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stream.write( firstByte );
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if ( firstByte == 0xff ) {
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stream.write( data[0] );
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writeDeltaClock( stream, data.Length - 1 );
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//stream.WriteByte( (byte)(Data.Length - 1) );
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stream.write( data, 1, data.Length - 1 );
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} else {
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stream.write( data, 0, data.Length );
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}
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}
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public int compareTo( MidiEvent item ) {
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if ( clock != item.clock ) {
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return (int)(clock - item.clock);
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} else {
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int first_this = firstByte & 0xf0;
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int first_item = item.firstByte & 0xf0;
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if ( (first_this == 0x80 || first_this == 0x90) && (first_item == 0x80 || first_item == 0x90) ) {
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if ( data != null && data.Length >= 2 && item.data != null && item.data.Length >= 2 ) {
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if ( first_item == 0x90 && item.data[1] == 0 ) {
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first_item = 0x80;
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}
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if ( first_this == 0x90 && data[1] == 0 ) {
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first_this = 0x80;
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}
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if ( data[0] == item.data[0] ) {
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if ( first_this == 0x90 ) {
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if ( first_item == 0x80 ) {
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// ON -> OFF
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return 1;
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} else {
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// ON -> ON
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return 0;
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}
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} else {
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if ( first_item == 0x80 ) {
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// OFF -> OFF
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return 0;
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} else {
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// OFF -> ON
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return -1;
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}
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}
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}
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}
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}
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return (int)(clock - item.clock);
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}
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}
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#if !JAVA
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public int CompareTo( MidiEvent item ) {
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return compareTo( item );
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}
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#endif
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public static MidiEvent generateTimeSigEvent( int clock, int numerator, int denominator ) {
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MidiEvent ret = new MidiEvent();
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ret.clock = clock;
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ret.firstByte = (byte)0xff;
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byte b_numer = (byte)(Math.Log( denominator ) / Math.Log( 2 ) + 0.1);
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#if DEBUG
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PortUtil.println( "VsqEvent.generateTimeSigEvent; b_number=" + b_numer + "; denominator=" + denominator );
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#endif
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ret.data = new byte[] { 0x58, (byte)numerator, b_numer, 0x18, 0x08 };
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return ret;
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}
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public static MidiEvent generateTempoChangeEvent( int clock, int tempo ) {
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MidiEvent ret = new MidiEvent();
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ret.clock = clock;
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ret.firstByte = (byte)0xff;
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byte b1 = (byte)(tempo & 0xff);
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tempo = tempo >> 8;
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byte b2 = (byte)(tempo & 0xff);
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tempo = tempo >> 8;
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byte b3 = (byte)(tempo & 0xff);
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ret.data = new byte[] { (byte)0x51, b3, b2, b1 };
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return ret;
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}
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}
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#if !JAVA
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}
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#endif
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