mirror of
https://git.femboyfinancial.jp/james/lipsync.git
synced 2024-11-24 19:51:59 -08:00
404 lines
16 KiB
C#
404 lines
16 KiB
C#
/*
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* MidiFile.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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using System;
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using System.IO;
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using System.Collections.Generic;
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namespace Boare.Lib.Vsq {
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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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public struct MidiEvent : IComparable<MidiEvent> {
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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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public long Clock {
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get {
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return clock;
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}
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set {
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clock = value;
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}
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}
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public byte FirstByte {
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get {
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return firstByte;
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}
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set {
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firstByte = value;
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}
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}
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public byte[] Data {
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get {
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return data;
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}
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set {
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data = value;
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}
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}
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private static void writeDeltaClock( Stream stream, long number ) {
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bool[] bits = new bool[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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uint num = 0;
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uint 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.WriteByte( (byte)num );
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}
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}
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private static long readDeltaClock( Stream stream ) {
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long ret = 0;
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while ( true ) {
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int i = stream.ReadByte();
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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( Stream stream, ref long last_clock, ref byte last_status_byte ) {
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long delta_clock = readDeltaClock( stream );
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last_clock += delta_clock;
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byte first_byte = (byte)stream.ReadByte();
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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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stream.Seek( -1, SeekOrigin.Current );
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first_byte = last_status_byte;
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} else {
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last_status_byte = 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;
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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;
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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;
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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.ReadByte();
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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;
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me.firstByte = first_byte;
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me.data = new byte[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;
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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[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;
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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[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 ApplicationException( "don't know how to process first_byte: 0x" + Convert.ToString( first_byte, 16 ) );
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}
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}
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public void writeData( Stream stream ) {
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stream.WriteByte( firstByte );
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if ( firstByte == 0xff ) {
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stream.WriteByte( 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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return (int)(clock - item.clock);
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}
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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 = 0xff;
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byte b_numer = (byte)(Math.Log( denominator, 2 ) + 0.1);
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#if DEBUG
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Console.WriteLine( "VsqEvent.generateTimeSigEvent; b_number=" + b_numer + "; denominator=" + denominator );
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#endif
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ret.data = new byte[5] { 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 = 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[4] { 0x51, b3, b2, b1 };
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return ret;
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}
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}
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public class MidiFile : IDisposable {
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private List<List<MidiEvent>> m_events;
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private ushort m_format;
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private ushort m_time_format;
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public MidiFile( string path ){
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Stream stream = new FileStream( path, FileMode.Open, FileAccess.Read );
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// ヘッダ
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byte[] byte4 = new byte[4];
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stream.Read( byte4, 0, 4 );
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if ( makeUInt32( byte4 ) != 0x4d546864 ) {
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throw new ApplicationException( "header error: MThd" );
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}
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// データ長
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stream.Read( byte4, 0, 4 );
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uint length = makeUInt32( byte4 );
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// フォーマット
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stream.Read( byte4, 0, 2 );
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m_format = makeUint16( byte4 );
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// トラック数
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int tracks = 0;
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stream.Read( byte4, 0, 2 );
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tracks = (int)makeUint16( byte4 );
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// 時間分解能
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stream.Read( byte4, 0, 2 );
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m_time_format = makeUint16( byte4 );
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// 各トラックを読込み
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m_events = new List<List<MidiEvent>>();
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for ( int track = 0; track < tracks; track++ ) {
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// ヘッダー
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stream.Read( byte4, 0, 4 );
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if ( makeUInt32( byte4 ) != 0x4d54726b ) {
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throw new ApplicationException( "header error; MTrk" );
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}
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m_events.Add( new List<MidiEvent>() );
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// チャンクサイズ
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stream.Read( byte4, 0, 4 );
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long size = (long)makeUInt32( byte4 );
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long startpos = stream.Position;
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// チャンクの終わりまで読込み
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long clock = 0;
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byte last_status_byte = 0x00;
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while ( stream.Position < startpos + size ) {
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MidiEvent mi = MidiEvent.read( stream, ref clock, ref last_status_byte );
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m_events[track].Add( mi );
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}
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if ( m_time_format != 480 ) {
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int count = m_events[track].Count;
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for ( int i = 0; i < count; i++ ) {
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MidiEvent mi = m_events[track][i];
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mi.clock = mi.clock * 480 / m_time_format;
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m_events[track][i] = mi;
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}
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}
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}
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m_time_format = 480;
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#if DEBUG
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string dbg = Path.Combine( Path.GetDirectoryName( path ), Path.GetFileNameWithoutExtension( path ) + ".txt" );
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using ( StreamWriter sw = new StreamWriter( dbg ) ) {
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const string format = " {0,8} 0x{1:X4} {2,-35} 0x{3:X2} 0x{4:X2}";
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const string format0 = " {0,8} 0x{1:X4} {2,-35} 0x{3:X2}";
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for ( int track = 1; track < m_events.Count; track++ ) {
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sw.WriteLine( "MidiFile..ctor; track=" + track );
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byte msb, lsb, data_msb, data_lsb;
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msb = lsb = data_msb = data_lsb = 0x0;
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for ( int i = 0; i < m_events[track].Count; i++ ) {
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if ( m_events[track][i].firstByte == 0xb0 ) {
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switch ( m_events[track][i].data[0] ) {
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case 0x63:
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msb = m_events[track][i].data[1];
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lsb = 0x0;
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break;
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case 0x62:
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lsb = m_events[track][i].data[1];
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break;
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case 0x06:
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data_msb = m_events[track][i].data[1];
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ushort nrpn = (ushort)(msb << 8 | lsb);
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string name = NRPN.getName( nrpn );
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if ( name == "" ) {
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name = "* * UNKNOWN * *";
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sw.WriteLine( string.Format( format0, m_events[track][i].clock, nrpn, name, data_msb ) );
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} else {
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//if ( !NRPN.is_require_data_lsb( nrpn ) ) {
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sw.WriteLine( string.Format( format0, m_events[track][i].clock, nrpn, name, data_msb ) );
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//}
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}
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break;
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case 0x26:
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data_lsb = m_events[track][i].data[1];
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ushort nrpn2 = (ushort)(msb << 8 | lsb);
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string name2 = NRPN.getName( nrpn2 );
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if ( name2 == "" ) {
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name2 = "* * UNKNOWN * *";
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}
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sw.WriteLine( string.Format( format, m_events[track][i].clock, nrpn2, name2, data_msb, data_lsb ) );
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break;
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}
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}
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}
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}
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}
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#endif
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stream.Close();
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}
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/*public void Write( string path ) {
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}*/
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public List<MidiEvent> getMidiEventList( int track ) {
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if ( m_events == null ) {
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return new List<MidiEvent>();
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} else if ( 0 <= track && track < m_events.Count ) {
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return m_events[track];
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} else {
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return new List<MidiEvent>();
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}
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}
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public int getTrackCount() {
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if ( m_events == null ) {
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return 0;
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} else {
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return m_events.Count;
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}
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}
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public void Dispose() {
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Close();
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}
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public void Close() {
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if ( m_events != null ) {
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for ( int i = 0; i < m_events.Count; i++ ) {
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m_events[i].Clear();
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}
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m_events.Clear();
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}
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}
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private static UInt32 makeUInt32( byte[] value ) {
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return (uint)((uint)((uint)((uint)(value[0] << 8) | value[1]) << 8 | value[2]) << 8 | value[3]);
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}
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private static UInt16 makeUint16( byte[] value ) {
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return (ushort)((ushort)(value[0] << 8) | value[1]);
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}
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private static long readDeltaClock( Stream stream ) {
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byte[] b;
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long ret = 0;
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while ( true ) {
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byte d = (byte)stream.ReadByte();
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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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}
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} |