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[英]Error in C# Script for Unity, how do I read this CSV file into an array?
[英]How do I read an audio file into an array in C#
我试图将WAV文件读取到c#中的缓冲区数组中,但是遇到一些问题。 我正在使用文件流来管理音频文件。 这就是我所拥有的...
FileStream WAVFile = new FileStream(@"test.wav", FileMode.Open);
//Buffer for the wave file...
BinaryReader WAVreader = new BinaryReader(WAVFile);
//Read information from the header.
chunkID = WAVreader.ReadInt32();
chunkSize = WAVreader.ReadInt32();
RiffFormat = WAVreader.ReadInt32();
...
channels = WAVreader.ReadInt16();
samplerate = WAVreader.ReadInt32();
byteRate = WAVreader.ReadInt32();
blockAllign = WAVreader.ReadInt16();
bitsPerSample = WAVreader.ReadInt16();
dataID = WAVreader.ReadInt32();
dataSize = WAVreader.ReadInt32();
上面是从WAV文件头读取数据。 然后我有这个:
musicalData = WAVreader.ReadBytes(dataSize);
...读取实际的样本数据,但是对于60秒的音频来说,这只是26个字节。 这个对吗?
我将如何将byte []数组转换为double []?
这段代码可以解决问题。 它将wave文件转换为规范化的双精度数组(-1到1),但是将其转换为int / short数组应该很简单(删除/32768.0位并添加32768)。 如果发现加载的wav文件是mono,则right []数组将设置为null。
我不能说它是完全防弹的(潜在的一次性错误),但是在创建65536个样本数组并创建从-1到1的波动之后,所有样本似乎都没有“穿过”天花板或地板。
// convert two bytes to one double in the range -1 to 1
static double bytesToDouble(byte firstByte, byte secondByte)
{
// convert two bytes to one short (little endian)
short s = (secondByte << 8) | firstByte;
// convert to range from -1 to (just below) 1
return s / 32768.0;
}
// Returns left and right double arrays. 'right' will be null if sound is mono.
public void openWav(string filename, out double[] left, out double[] right)
{
byte[] wav = File.ReadAllBytes(filename);
// Determine if mono or stereo
int channels = wav[22]; // Forget byte 23 as 99.999% of WAVs are 1 or 2 channels
// 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.
int samples = (wav.Length - pos)/2; // 2 bytes per sample (16 bit sound mono)
if (channels == 2)
{
samples /= 2; // 4 bytes per sample (16 bit stereo)
}
// Allocate memory (right will be null if only mono sound)
left = new double[samples];
if (channels == 2)
{
right = new double[samples];
}
else
{
right = null;
}
// Write to double array/s:
int i=0;
while (pos < length)
{
left[i] = bytesToDouble(wav[pos], wav[pos + 1]);
pos += 2;
if (channels == 2)
{
right[i] = bytesToDouble(wav[pos], wav[pos + 1]);
pos += 2;
}
i++;
}
}
如果要使用插件,则假设您的WAV文件包含16位PCM(这是最常见的),则可以使用NAudio将其读出到字节数组中,然后为了方便起见将其复制到16位整数数组中。 如果是立体声,则样本将左右左右交错。
using (WaveFileReader reader = new WaveFileReader("myfile.wav"))
{
Assert.AreEqual(16, reader.WaveFormat.BitsPerSample, "Only works with 16 bit audio");
byte[] buffer = new byte[reader.Length];
int read = reader.Read(buffer, 0, buffer.Length);
short[] sampleBuffer = new short[read / 2];
Buffer.BlockCopy(buffer, 0, sampleBuffer, 0, read);
}
我个人尽量避免使用第三方库。 但是,如果您希望代码看起来更好,更易于处理,则仍然可以使用该选项。
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