protected internal override SoundEffect Read(
ContentReader input, SoundEffect existingInstance)
{
#region Old XNA spec
// XNB format for SoundEffect...
//
// Byte [format size] Format WAVEFORMATEX structure
// UInt32 Data size
// Byte [data size] Data Audio waveform data
// Int32 Loop start In bytes (start must be format block aligned)
// Int32 Loop length In bytes (length must be format block aligned)
// Int32 Duration In milliseconds
// The header containss the WAVEFORMATEX header structure
// defined as the following...
//
// WORD wFormatTag; // byte[0] +2
// WORD nChannels; // byte[2] +2
// DWORD nSamplesPerSec; // byte[4] +4
// DWORD nAvgBytesPerSec; // byte[8] +4
// WORD nBlockAlign; // byte[12] +2
// WORD wBitsPerSample; // byte[14] +2
// WORD cbSize; // byte[16] +2
#endregion
// We let the sound effect deal with parsing this based
// on what format the audio data actually is.
int headerSize = input.ReadInt32();
byte[] header = input.ReadBytes(headerSize);
int loopStart = input.ReadInt32();
int loopLength = input.ReadInt32();
var duration = input.ReadObject <TimeSpan>();
SoundEffect effect;
int rawSize = input.ReadInt32();
short format = BinaryPrimitives.ReadInt16LittleEndian(header);
SoundEffect CreateSoundEffect(RecyclableBuffer buffer)
{
var data = buffer.AsSpan(0, buffer.BaseLength);
return(new SoundEffect(header, data, duration, loopStart, loopLength)
{
// Store the original asset name for debugging later.
Name = input.AssetName
});
}
if (format == 1)
{
using (var data = AudioLoader.Load(
input.BaseStream, out ALFormat alFormat, out _, out _, out _, out _, out _, out _))
{
if (alFormat == ALFormat.MonoFloat32 || alFormat == ALFormat.StereoFloat32)
{
BinaryPrimitives.WriteInt16LittleEndian(header, 3);
}
// data gets uploaded synchronously
effect = CreateSoundEffect(data);
}
}
else
{
using (var data = RecyclableBuffer.ReadBytes(
input.BaseStream, rawSize, nameof(SoundEffectReader)))
effect = CreateSoundEffect(data);
}
return(effect);
}