首先说一下起因，我这里有需求将音频文件加密，所以一般的组件和www加载都不能使用，于是我需要一种新的方案来加载音频文件。于是我找到了一个开源的音频处理类库NAudio来处理MP3和wav的音频文件，同时我还需要使用到ogg的音频格式，后面还找到了NVorbis，我这里也是初步探索，顺便发篇博客分享一下。
1.NAudio的链接:[http://naudio.codeplex.com/](javascript:void() "http://naudio.codeplex.com/")，里面有相关的介绍和详细的文档，对unity3d还有一个插件，[https://www.assetstore.unity3d.com/en/#!/content/32034](javascript:void() "https://www.assetstore.unity3d.com/en/#!/content/32034 ") ，我并没有机会下载下来学习一下，只是简单使用了NAudio的几个接口，后面有兴趣的可以和我一起研究一下NAudio。
2.NVorbis的链接:[http://nvorbis.codeplex.com/](javascript:void() "http://nvorbis.codeplex.com/ ") ,这里是支持ogg需要下载的类库，后面我实用到相关的接口，我再给出详细的文档链接。
3.从NAudio和NVorbis下载发布的dll文件放在unity中，NVorbis还需要导入NVorbis.NAudioSupport.dll后面需要使用NAudio来播放ogg，记得将unity的Api Compatibility Level 改为.NET 2.0。
4.在unity3d中播放MP3，文档链接[http://naudio.codeplex.com/wikipage?title=MP3](javascript:void() "http://naudio.codeplex.com/wikipage?title=MP3 ")
4.1 使用命名空间
using
NAudio;
using
NAudio.Wave;
4.2 申请一个播放组件和一个音频文件读取
IWavePlayer waveOutDevice;`
AudioFileReader audioFileReader;`
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4.3 开始读取文件和播放音乐
void
Start (){
waveOutDevice = new
WaveOut();
audioFileReader = new
AudioFileReader(
@"D:\影音文件\音乐\BEYOND\黄家驹 - 总有爱.mp3"
);
waveOutDevice.Init(audioFileReader);
waveOutDevice.Play();
}
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4.4 注意在程序中退出的关闭音乐播放组件，因为他并不是使用unity在播放声音，而且使用自带的组件播放的了
void
OnApplicationQuit()
{
if
(waveOutDevice != null
)
{
waveOutDevice.Stop();
}
if
(waveOutDevice != null
)
{
waveOutDevice.Dispose();
waveOutDevice = null
;
}
}
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4.5 还有这里加载wav也是同样可以播放的，同时应该也可以试试其他格式的音频比如aiff,但是肯定不支持ogg，下面我会单独再来使用ogg。
5.在unity3d中播放ogg,文档链接:
[http://nvorbis.codeplex.com/documentation](javascript:void() "http://nvorbis.codeplex.com/documentation ")
,我这里还是会使用NAudio来播放
5.1使用命名空间
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using
NVorbis;
using
NVorbis.NAudioSupport;
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5.2 加载ogg文件，并开始播放
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void
Start (){
waveOutDevice = new
WaveOut();
VorbisWaveReader oggReader = new
VorbisWaveReader(
@"D:\侧田 - 感动.ogg"
);
waveOutDevice.Init(oggReader);
waveOutDevice.Play();
}
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6.按着以上的方法来播放音乐是否感觉特别简单了，但是在实际使用中，如果是加载外部音频文件，我知道肯定有人还是觉得使用www来加载感觉更方便一些。
于是我决定再来啰嗦一下，如果使用www外部加载时不能加载MP3格式的音频文件，但是目前MP3格式的音频文件确实最多的，还有一个重要因素是，我目前解密出来的音频文件是一堆字节数组，而且我也不知道不同音频应该怎样去解码，如果我再把字节数组去写成一个音频文件再用www来读取，那确实有点闲得蛋疼的感觉了。
于是下面就是来实现怎样利用NAudio和NVorbis把一堆字节数组转成unity的AudioClip，使用unity的AudioSource来播放。
6.1 mp3/wav字节数组转AudioClip，具体给出代码来了，参考链接:
[http://gamedev.stackexchange.com/questions/114885/how-do-i-play-mp3-files-in-unity-standalone](javascript:void() "http://gamedev.stackexchange.com/questions/114885/how-do-i-play-mp3-files-in-unity-standalone")
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public
static
AudioClip FromWavData(
byte
[] data)
{
// Load the data into a stream
MemoryStream wavstream = new
MemoryStream(data);
WaveFileReader wavaudio = new
WaveFileReader(wavstream);
WaveStream waveStream = WaveFormatConversionStream.CreatePcmStream(wavaudio);
// Convert to WAV data
WAV wav = new
WAV(AudioMemStream(waveStream).ToArray());
Debug.Log(wav);
AudioClip audioClip = AudioClip.Create(
"clip"
, wav.SampleCount, 1, wav.Frequency, false
);
audioClip.SetData(wav.LeftChannel, 0);
// Return the clip
return
audioClip;
}
public
static
AudioClip FromMp3Data(
byte
[] data)
{
// Load the data into a stream
MemoryStream mp3stream = new
MemoryStream(data);
// Convert the data in the stream to WAV format
Mp3FileReader mp3audio = new
Mp3FileReader(mp3stream);
WaveStream waveStream = WaveFormatConversionStream.CreatePcmStream(mp3audio);
// Convert to WAV data
WAV wav = new
WAV(AudioMemStream(waveStream).ToArray());
Debug.Log(wav);
AudioClip audioClip = AudioClip.Create(
"clip"
, wav.SampleCount, 1, wav.Frequency, false
);
audioClip.SetData(wav.LeftChannel, 0);
// Return the clip
return
audioClip;
}
private
static
MemoryStream AudioMemStream(WaveStream waveStream)
{
MemoryStream outputStream = new
MemoryStream();
using
(WaveFileWriter waveFileWriter = new
WaveFileWriter(outputStream, waveStream.WaveFormat))
{
byte
[] bytes = new
byte
[waveStream.Length];
waveStream.Position = 0;
waveStream.Read(bytes, 0, Convert.ToInt32(waveStream.Length));
waveFileWriter.Write(bytes, 0, bytes.Length);
waveFileWriter.Flush();
}
return
outputStream;
}
}
`/* From
[http://answers.unity3d.com/questions/737002/wav-byte-to-audioclip.html](javascript:void() "http://answers.unity3d.com/questions/737002/wav-byte-to-audioclip.html")
*/`
public
class
WAV
{
// convert two bytes to one float in the range -1 to 1
static
float
bytesToFloat(
byte
firstByte, byte
secondByte)
{
// convert two bytes to one short (little endian)
short
s = (
short
)((secondByte << 8) | firstByte);
// convert to range from -1 to (just below) 1
return
s / 32768.0F;
}
static
int
bytesToInt(
byte
[] bytes, int
offset = 0)
{
int
value = 0;
for
(
int
i = 0; i < 4; i++)
{
value |= ((
int
)bytes[offset + i]) << (i * 8);
}
return
value;
}
// properties
public
float
[] LeftChannel { get
; internal
set
; }
public
float
[] RightChannel { get
; internal
set
; }
public
int
ChannelCount { get
; internal
set
; }
public
int
SampleCount { get
; internal
set
; }
public
int
Frequency { get
; internal
set
; }
public
WAV(
byte
[] wav)
{
// Determine if mono or stereo
ChannelCount = wav[22]; ``// Forget byte 23 as 99.999% of WAVs are 1 or 2 channels
// Get the frequency
Frequency = bytesToInt(wav, 24);
// Get past all the other sub chunks to get to the data subchunk:
int
pos = 12; ``// First Subchunk ID from 12 to 16
// Keep iterating until we find the data chunk (i.e. 64 61 74 61 ...... (i.e. 100 97 116 97 in decimal))
while
(!(wav[pos] == 100 && wav[pos + 1] == 97 && wav[pos + 2] == 116 && wav[pos + 3] == 97))
{
pos += 4;
int
chunkSize = wav[pos] + wav[pos + 1] * 256 + wav[pos + 2] * 65536 + wav[pos + 3] * 16777216;
pos += 4 + chunkSize;
}
pos += 8;
// Pos is now positioned to start of actual sound data.
SampleCount = (wav.Length - pos) / 2; ``// 2 bytes per sample (16 bit sound mono)
if
(ChannelCount == 2) SampleCount /= 2; ``// 4 bytes per sample (16 bit stereo)
// Allocate memory (right will be null if only mono sound)
LeftChannel = new
float
[SampleCount];
if
(ChannelCount == 2) RightChannel = new
float
[SampleCount];
else
RightChannel = null
;
// Write to double array/s:
int
i = 0;
while
(pos < wav.Length)
{
LeftChannel[i] = bytesToFloat(wav[pos], wav[pos + 1]);
pos += 2;
if
(ChannelCount == 2)
{
RightChannel[i] = bytesToFloat(wav[pos], wav[pos + 1]);
pos += 2;
}
i++;
}
}
public
override
string
ToString()
{
return
string
.Format(
"[WAV: LeftChannel={0}, RightChannel={1}, ChannelCount={2}, SampleCount={3}, Frequency={4}]"
, LeftChannel, RightChannel, ChannelCount, SampleCount, Frequency);
}
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6.2 ogg字节数组转AudioClip，参考链接:
[http://answers.unity3d.com/questions/499028/onaudioread-buffer-changing-sizes.html](javascript:void() "http://answers.unity3d.com/questions/499028/onaudioread-buffer-changing-sizes.html ")
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static
NVorbis.VorbisReader vorbis;
public
static
AudioClip FromOggData(
byte
[] data)
{
// Load the data into a stream
MemoryStream oggstream = new
MemoryStream(data);
vorbis = new
NVorbis.VorbisReader(oggstream, false
);
int
samplecount = (
int
)(vorbis.SampleRate * vorbis.TotalTime.TotalSeconds);
AudioClip audioClip = AudioClip.Create(
"clip"
, samplecount, vorbis.Channels, vorbis.SampleRate, false
, true
, OnAudioRead, OnAudioSetPosition);
// Return the clip
return
audioClip;
}
static
void
OnAudioRead(
float
[] data)
{
var f = new
float
[data.Length];
vorbis.ReadSamples(f, 0, data.Length);
for
(
int
i = 0; i < data.Length; i++)
{
data[i] = f[i];
}
}
static
void
OnAudioSetPosition(
int
newPosition)
{
vorbis.DecodedTime = new
TimeSpan(0);``//Only used to rewind the stream, we won't be seeking
}
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7.这里我给出了很多的相关链接，都是我在查找NAudio的资料，对我使用有帮助的一些文章，也分享给大家一起学习。而且NAudio好像还支持读取midi文件与合并mp3等很多功能，可以持续关注。