internal SoundEffect(
string name,
byte[] buffer,
uint sampleRate,
uint channels,
uint loopStart,
uint loopLength,
bool isADPCM,
uint formatParameter
)
{
Name = name;
INTERNAL_buffer = AudioDevice.GenBuffer(
buffer,
sampleRate,
channels,
loopStart,
loopStart + loopLength,
isADPCM,
formatParameter
);
}
private void INTERNAL_loadAudioStream(Stream s)
{
byte[] data;
uint sampleRate = 0;
uint numChannels = 0;
bool isADPCM = false;
uint formatParameter = 0;
using (BinaryReader reader = new BinaryReader(s))
{
// RIFF Signature
string signature = new string(reader.ReadChars(4));
if (signature != "RIFF")
{
throw new NotSupportedException("Specified stream is not a wave file.");
}
reader.ReadUInt32(); // Riff Chunk Size
string wformat = new string(reader.ReadChars(4));
if (wformat != "WAVE")
{
throw new NotSupportedException("Specified stream is not a wave file.");
}
// WAVE Header
string format_signature = new string(reader.ReadChars(4));
while (format_signature != "fmt ")
{
reader.ReadBytes(reader.ReadInt32());
format_signature = new string(reader.ReadChars(4));
}
int format_chunk_size = reader.ReadInt32();
// Header Information
uint audio_format = reader.ReadUInt16(); // 2
numChannels = reader.ReadUInt16(); // 4
sampleRate = reader.ReadUInt32(); // 8
reader.ReadUInt32(); // 12, Byte Rate
ushort blockAlign = reader.ReadUInt16(); // 14, Block Align
ushort bitDepth = reader.ReadUInt16(); // 16, Bits Per Sample
if (audio_format == 1)
{
System.Diagnostics.Debug.Assert(bitDepth == 8 || bitDepth == 16);
formatParameter = (uint)(bitDepth / 16); // 1 for 16, 0 for 8
}
else if (audio_format != 2)
{
isADPCM = true;
formatParameter = (((blockAlign / numChannels) - 6) * 2);
}
else
{
throw new NotSupportedException("Wave format is not supported.");
}
// Reads residual bytes
if (format_chunk_size > 16)
{
reader.ReadBytes(format_chunk_size - 16);
}
// data Signature
string data_signature = new string(reader.ReadChars(4));
while (data_signature.ToLowerInvariant() != "data")
{
reader.ReadBytes(reader.ReadInt32());
data_signature = new string(reader.ReadChars(4));
}
if (data_signature != "data")
{
throw new NotSupportedException("Specified wave file is not supported.");
}
int waveDataLength = reader.ReadInt32();
data = reader.ReadBytes(waveDataLength);
}
INTERNAL_buffer = AudioDevice.GenBuffer(
data,
sampleRate,
numChannels,
0,
0,
isADPCM,
formatParameter
);
}
