我目前正在尝试解析MIDI文件以使用NAudio MIDI库创建音符事件,可用于允许虚拟钢琴与MIDI音轨一起播放。我有一个类应该这样做,但是,有一个我无法弄清楚的错误。以下是目前形式的课程:
public MidiFile midi;
public float ticks;
public float offset;
// Use this for initialization
void Start () {
//Loading midi file "mainSong.bytes" from resources folder
//Its a midi file, extension has been changed to .bytes manually
TextAsset asset = Resources.Load("mainSong") as TextAsset;
Stream s = new MemoryStream(asset.bytes);
//Read the file
midi = new MidiFile(s, true);
//Ticks needed for timing calculations
ticks = midi.DeltaTicksPerQuarterNote;
}
public void StartPlayback()
{
foreach (MidiEvent note in midi.Events)
{
//If its the start of the note event
if (note.CommandCode == MidiCommandCode.NoteOn)
{
//Cast to note event and process it
NoteOnEvent noe = (NoteOnEvent)note;
NoteEvent(noe);
}
}
}
public void NoteEvent(NoteOnEvent noe)
{
//The bpm(tempo) of the track
float bpm = 150;
//Time until the start of the note in seconds
float time = (60 * noe.AbsoluteTime) / (bpm * ticks);
int noteNumber = noe.NoteNumber;
//Start coroutine for each note at the start of the playback
StartCoroutine(CreateAction(time, noteNumber, noe.NoteLength));
}
IEnumerator CreateAction(float t, int noteNumber, float length)
{
//Wait for the start of the note
yield return new WaitForSeconds(t);
//The note is about to play, do stuff here
Debug.Log("Playing note: "+noteNumber);
}
目前,在尝试构建此代码时,该行的Start方法中存在错误
midi = new MidiFile(s, true);
错误“无法从system.io.stream转换为字符串”
解析 s 作为字符串midi = new MidiFile(s.ToString(), true);
允许代码构建,但是,在运行Unity项目时,相同的行会出现此错误:“找不到文件”D :\ USER PROFILE \ Documents \ Unity Projects \ New Unity Project \ System.IO.MemoryStream“
有没有人知道如何修复这些错误中的任何一个以允许此代码在Unity中运行?
答案 0 :(得分:0)
查看source code,您可以找到满足Stream, bool
签名的构造函数:
/// <summary>
/// Opens a MIDI file stream for reading
/// </summary>
/// <param name="inputStream">The input stream containing a MIDI file</param>
/// <param name="strictChecking">If true will error on non-paired note events</param>
public MidiFile(Stream inputStream, bool strictChecking) :
this(inputStream, strictChecking, false)
{
}
您似乎正在使用旧版本的库。早在2013年,NAudio就不支持从流媒体播放MIDI。
查看历史记录,似乎在2017-04-15上添加了Stream支持。
您应该尝试找到更新的版本,例如安装一个较新的NuGet包。
s.ToString()
绝对不会帮助你,因为:
Stream
对象转换为人类可读的格式。除了一些特殊对象,它通常是类名。在您的情况下,班级名称为System.IO.MemoryStream
(s
的类型)。System.IO.memoryStream
的文件。当前目录为D:\User\...\New Unity Project
。