MoonWorks/src/Audio/StreamingSoundOgg.cs

91 lines
2.3 KiB
C#

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