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support have junk or minf chunks wav files #7

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aeae806
support have junk or minf chunks wav files
Oct 28, 2021
fd6c2a4
fix bug
Jan 6, 2022
715a9ea
fix other funciton
Jan 6, 2022
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117 changes: 110 additions & 7 deletions WavUtility.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -37,24 +37,63 @@ public static AudioClip ToAudioClip (string filePath)
return ToAudioClip (fileBytes, 0);
}

private static void FindChunk(ref int position,string key,byte[] fileBytes)
{
bool result = true;
do
{
position += 4;
int junkSize = BitConverter.ToInt32(fileBytes, position);
position += 4;
position += junkSize;
string nexChunks = Encoding.ASCII.GetString(fileBytes, position, key.Length);
if (nexChunks==key)
{
result = false;
}
} while (result);
}

public static AudioClip ToAudioClip (byte[] fileBytes, int offsetSamples = 0, string name = "wav")
{
int position = 0;
//string riff = Encoding.ASCII.GetString (fileBytes, 0, 4);
position += 4;//riff
position += 4;//size
//string wave = Encoding.ASCII.GetString (fileBytes, 8, 4);
int subchunk1 = BitConverter.ToInt32 (fileBytes, 16);
UInt16 audioFormat = BitConverter.ToUInt16 (fileBytes, 20);
position += 4;//wave
string junk = Encoding.ASCII.GetString(fileBytes, 12, 4);

if (junk=="JUNK") //JUNK Chunks
{
//position += 4;//junk
FindChunk( ref position,"fmt ",fileBytes);
}

position += 4;//subchunk
int subchunk1 = BitConverter.ToInt32 (fileBytes, position);
UInt16 audioFormat = BitConverter.ToUInt16 (fileBytes, position+4);
if (audioFormat != 1 && audioFormat != 65524) return null;

// NB: Only uncompressed PCM wav files are supported.
string formatCode = FormatCode (audioFormat);
Debug.AssertFormat (audioFormat == 1 || audioFormat == 65534, "Detected format code '{0}' {1}, but only PCM and WaveFormatExtensable uncompressed formats are currently supported.", audioFormat, formatCode);

UInt16 channels = BitConverter.ToUInt16 (fileBytes, 22);
int sampleRate = BitConverter.ToInt32 (fileBytes, 24);
UInt16 channels = BitConverter.ToUInt16 (fileBytes, position+6);
int sampleRate = BitConverter.ToInt32 (fileBytes, position+8);
//int byteRate = BitConverter.ToInt32 (fileBytes, 28);
//UInt16 blockAlign = BitConverter.ToUInt16 (fileBytes, 32);
UInt16 bitDepth = BitConverter.ToUInt16 (fileBytes, 34);
UInt16 bitDepth = BitConverter.ToUInt16 (fileBytes, position+18);

int headerOffset = position + 4 + subchunk1;

int headerOffset = 16 + 4 + subchunk1 + 4;
string secondchunk = Encoding.ASCII.GetString(fileBytes, headerOffset, 4);
if (secondchunk!="data")
{
//jump other chunk like minf chunk
FindChunk(ref headerOffset, "data",fileBytes);
}
headerOffset += 4;
int subchunk2 = BitConverter.ToInt32 (fileBytes, headerOffset);
//Debug.LogFormat ("riff={0} wave={1} subchunk1={2} format={3} channels={4} sampleRate={5} byteRate={6} blockAlign={7} bitDepth={8} headerOffset={9} subchunk2={10} filesize={11}", riff, wave, subchunk1, formatCode, channels, sampleRate, byteRate, blockAlign, bitDepth, headerOffset, subchunk2, fileBytes.Length);

Expand All @@ -73,14 +112,78 @@ public static AudioClip ToAudioClip (byte[] fileBytes, int offsetSamples = 0, st
data = Convert32BitByteArrayToAudioClipData (fileBytes, headerOffset, subchunk2);
break;
default:
throw new Exception (bitDepth + " bit depth is not supported.");
Debug.Log (bitDepth + " bit depth is not supported.");
return null;
}

AudioClip audioClip = AudioClip.Create (name, data.Length, (int)channels, sampleRate, false);
audioClip.SetData (data, 0);
return audioClip;
}

public static float[] ToAudioData(byte[] fileBytes)
{
int position = 0;
//string riff = Encoding.ASCII.GetString (fileBytes, 0, 4);
position += 4;//riff
position += 4;//size
//string wave = Encoding.ASCII.GetString (fileBytes, 8, 4);
position += 4;//wave
string junk = Encoding.ASCII.GetString(fileBytes, 12, 4);

if (junk=="JUNK") //JUNK Chunks
{
FindChunk( ref position,"fmt ",fileBytes);
}

position += 4;//subchunk
int subchunk1 = BitConverter.ToInt32 (fileBytes, position);
UInt16 audioFormat = BitConverter.ToUInt16 (fileBytes, position+4);
if (audioFormat != 1 && audioFormat != 65524) return null;

// NB: Only uncompressed PCM wav files are supported.
string formatCode = FormatCode (audioFormat);
Debug.AssertFormat (audioFormat == 1 || audioFormat == 65534, "Detected format code '{0}' {1}, but only PCM and WaveFormatExtensable uncompressed formats are currently supported.", audioFormat, formatCode);

//UInt16 channels = BitConverter.ToUInt16 (fileBytes, position+6);
//int sampleRate = BitConverter.ToInt32 (fileBytes, position+8);
//int byteRate = BitConverter.ToInt32 (fileBytes, 28);
//UInt16 blockAlign = BitConverter.ToUInt16 (fileBytes, 32);
UInt16 bitDepth = BitConverter.ToUInt16 (fileBytes, position+18);

int headerOffset = position + 4 + subchunk1;

string secondchunk = Encoding.ASCII.GetString(fileBytes, headerOffset, 4);
if (secondchunk!="data")
{
//jump other chunk like minf chunk
FindChunk(ref headerOffset, "data",fileBytes);
}
headerOffset += 4;
int subchunk2 = BitConverter.ToInt32 (fileBytes, headerOffset);
//Debug.LogFormat ("riff={0} wave={1} subchunk1={2} format={3} channels={4} sampleRate={5} byteRate={6} blockAlign={7} bitDepth={8} headerOffset={9} subchunk2={10} filesize={11}", riff, wave, subchunk1, formatCode, channels, sampleRate, byteRate, blockAlign, bitDepth, headerOffset, subchunk2, fileBytes.Length);

float[] data;
switch (bitDepth) {
case 8:
data = Convert8BitByteArrayToAudioClipData (fileBytes, headerOffset, subchunk2);
break;
case 16:
data = Convert16BitByteArrayToAudioClipData (fileBytes, headerOffset, subchunk2);
break;
case 24:
data = Convert24BitByteArrayToAudioClipData (fileBytes, headerOffset, subchunk2);
break;
case 32:
data = Convert32BitByteArrayToAudioClipData (fileBytes, headerOffset, subchunk2);
break;
default:
Debug.Log (bitDepth + " bit depth is not supported.");
return null;
}
return data;
}

#region wav file bytes to Unity AudioClip conversion methods

private static float[] Convert8BitByteArrayToAudioClipData (byte[] source, int headerOffset, int dataSize)
Expand Down