MoonWorks/src/Audio/StreamingSoundOgg.cs

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using System;
using System.IO;
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using System.Runtime.InteropServices;
namespace MoonWorks.Audio
{
public class StreamingSoundOgg : StreamingSoundSeekable
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{
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private IntPtr VorbisHandle;
private IntPtr FileDataPtr;
private FAudio.stb_vorbis_info Info;
protected override int BUFFER_SIZE => 32768;
public override bool AutoUpdate => true;
public unsafe static StreamingSoundOgg Load(AudioDevice device, string filePath)
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{
var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
var fileDataPtr = NativeMemory.Alloc((nuint) fileStream.Length);
var fileDataSpan = new Span<byte>(fileDataPtr, (int) fileStream.Length);
fileStream.ReadExactly(fileDataSpan);
fileStream.Close();
var vorbisHandle = FAudio.stb_vorbis_open_memory((IntPtr) fileDataPtr, fileDataSpan.Length, out int error, IntPtr.Zero);
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if (error != 0)
{
NativeMemory.Free(fileDataPtr);
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Logger.LogError("Error opening OGG file!");
Logger.LogError("Error: " + error);
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throw new AudioLoadException("Error opening OGG file!");
}
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var info = FAudio.stb_vorbis_get_info(vorbisHandle);
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return new StreamingSoundOgg(
device,
(IntPtr) fileDataPtr,
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vorbisHandle,
info
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);
}
internal unsafe StreamingSoundOgg(
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AudioDevice device,
IntPtr fileDataPtr, // MUST BE A NATIVE MEMORY HANDLE!!
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IntPtr vorbisHandle,
FAudio.stb_vorbis_info info
) : base(
device,
3, /* float type */
32, /* size of float */
(ushort) (4 * info.channels),
(ushort) info.channels,
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info.sample_rate
) {
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FileDataPtr = fileDataPtr;
VorbisHandle = vorbisHandle;
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Info = info;
}
public override void Seek(uint sampleFrame)
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{
FAudio.stb_vorbis_seek(VorbisHandle, sampleFrame);
}
protected unsafe override void FillBuffer(
void* buffer,
int bufferLengthInBytes,
out int filledLengthInBytes,
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out bool reachedEnd
) {
var lengthInFloats = bufferLengthInBytes / sizeof(float);
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/* NOTE: this function returns samples per channel, not total samples */
var samples = FAudio.stb_vorbis_get_samples_float_interleaved(
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VorbisHandle,
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Info.channels,
(IntPtr) buffer,
lengthInFloats
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);
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var sampleCount = samples * Info.channels;
reachedEnd = sampleCount < lengthInFloats;
filledLengthInBytes = sampleCount * sizeof(float);
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}
protected unsafe override void Destroy()
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{
base.Destroy();
if (!IsDisposed)
{
FAudio.stb_vorbis_close(VorbisHandle);
NativeMemory.Free((void*) FileDataPtr);
}
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}
}
}