97 lines
2.4 KiB
C#
97 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 AudioDataOgg : AudioData
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{
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private IntPtr FileDataPtr = IntPtr.Zero;
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private IntPtr VorbisHandle = IntPtr.Zero;
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private string FilePath;
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public override bool Loaded => VorbisHandle != IntPtr.Zero;
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public override uint DecodeBufferSize => 32768;
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public AudioDataOgg(string filePath)
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{
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FilePath = filePath;
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var handle = FAudio.stb_vorbis_open_filename(filePath, out var error, IntPtr.Zero);
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if (error != 0)
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{
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throw new AudioLoadException("Error loading file!");
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}
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var info = FAudio.stb_vorbis_get_info(handle);
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Format = new Format
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{
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Tag = FormatTag.IEEE_FLOAT,
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BitsPerSample = 32,
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Channels = (ushort) info.channels,
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SampleRate = info.sample_rate
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};
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FAudio.stb_vorbis_close(handle);
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}
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public override unsafe void Decode(void* buffer, int bufferLengthInBytes, out int filledLengthInBytes, 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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Format.Channels,
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(IntPtr) buffer,
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lengthInFloats
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);
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var sampleCount = samples * Format.Channels;
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reachedEnd = sampleCount < lengthInFloats;
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filledLengthInBytes = sampleCount * sizeof(float);
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}
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public override unsafe void Load()
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{
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if (!Loaded)
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{
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var fileStream = new FileStream(FilePath, FileMode.Open, FileAccess.Read);
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FileDataPtr = (nint) NativeMemory.Alloc((nuint) fileStream.Length);
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var fileDataSpan = new Span<byte>((void*) FileDataPtr, (int) fileStream.Length);
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fileStream.ReadExactly(fileDataSpan);
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fileStream.Close();
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VorbisHandle = FAudio.stb_vorbis_open_memory(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((void*) 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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}
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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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public override unsafe void Unload()
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{
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if (Loaded)
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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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VorbisHandle = IntPtr.Zero;
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FileDataPtr = IntPtr.Zero;
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}
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}
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}
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}
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