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