100 lines
2.4 KiB
C#
100 lines
2.4 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 : StreamingSound
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{
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// FIXME: what should this value be?
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public const int BUFFER_SIZE = 1024 * 128;
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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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private readonly float[] buffer; // currently decoded bytes
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public override SoundState State { get; protected set; }
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public static StreamingSoundOgg Load(AudioDevice device, string filePath)
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{
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var fileData = File.ReadAllBytes(filePath);
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var fileDataPtr = Marshal.AllocHGlobal(fileData.Length);
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Marshal.Copy(fileData, 0, fileDataPtr, fileData.Length);
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var vorbisHandle = FAudio.stb_vorbis_open_memory(fileDataPtr, fileData.Length, out int error, IntPtr.Zero);
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if (error != 0)
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{
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((GCHandle) fileDataPtr).Free();
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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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fileDataPtr,
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vorbisHandle,
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info
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);
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}
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internal StreamingSoundOgg(
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AudioDevice device,
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IntPtr fileDataPtr, // MUST BE AN ALLOCHGLOBAL HANDLE!!
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IntPtr vorbisHandle,
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FAudio.stb_vorbis_info info
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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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)
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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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buffer = new float[BUFFER_SIZE];
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device.AddDynamicSoundInstance(this);
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}
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protected override void AddBuffer(
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out float[] buffer,
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out uint bufferOffset,
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out uint bufferLength,
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out bool reachedEnd
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)
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{
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buffer = this.buffer;
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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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buffer,
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buffer.Length
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);
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var sampleCount = samples * Info.channels;
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bufferOffset = 0;
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bufferLength = (uint) sampleCount;
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reachedEnd = sampleCount < buffer.Length;
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}
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protected override void SeekStart()
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{
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FAudio.stb_vorbis_seek_start(VorbisHandle);
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}
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protected override void Destroy()
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{
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Marshal.FreeHGlobal(FileDataPtr);
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FAudio.stb_vorbis_close(VorbisHandle);
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}
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}
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}
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