104 lines
2.7 KiB
C#
104 lines
2.7 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 StreamingSoundQoa : StreamingSoundSeekable
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{
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private IntPtr QoaHandle;
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private IntPtr FileDataPtr;
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public override bool AutoUpdate => true;
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uint Channels;
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uint SamplesPerChannelPerFrame;
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uint TotalSamplesPerChannel;
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public unsafe static StreamingSoundQoa 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 qoaHandle = FAudio.qoa_open_from_memory((char*) fileDataPtr, (uint) fileDataSpan.Length, 0);
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if (qoaHandle == 0)
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{
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NativeMemory.Free(fileDataPtr);
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Logger.LogError("Error opening QOA file!");
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throw new AudioLoadException("Error opening QOA file!");
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}
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FAudio.qoa_attributes(qoaHandle, out var channels, out var sampleRate, out var samplesPerChannelPerFrame, out var totalSamplesPerChannel);
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return new StreamingSoundQoa(
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device,
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(IntPtr) fileDataPtr,
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qoaHandle,
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channels,
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sampleRate,
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samplesPerChannelPerFrame,
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totalSamplesPerChannel
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);
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}
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internal unsafe StreamingSoundQoa(
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AudioDevice device,
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IntPtr fileDataPtr, // MUST BE A NATIVE MEMORY HANDLE!!
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IntPtr qoaHandle,
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uint channels,
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uint samplesPerSecond,
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uint samplesPerChannelPerFrame,
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uint totalSamplesPerChannel
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) : base(
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device,
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1,
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16,
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(ushort) (2 * channels),
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(ushort) channels,
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samplesPerSecond,
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samplesPerChannelPerFrame * channels * sizeof(short)
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) {
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FileDataPtr = fileDataPtr;
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QoaHandle = qoaHandle;
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Channels = channels;
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SamplesPerChannelPerFrame = samplesPerChannelPerFrame;
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TotalSamplesPerChannel = totalSamplesPerChannel;
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}
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public override void Seek(uint sampleFrame)
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{
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FAudio.qoa_seek_frame(QoaHandle, (int) sampleFrame);
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}
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protected override unsafe 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 lengthInShorts = bufferLengthInBytes / sizeof(short);
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// NOTE: this function returns samples per channel!
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var samples = FAudio.qoa_decode_next_frame(QoaHandle, (short*) buffer);
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var sampleCount = samples * Channels;
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reachedEnd = sampleCount < lengthInShorts;
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filledLengthInBytes = (int) (sampleCount * sizeof(short));
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}
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protected override unsafe 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.qoa_close(QoaHandle);
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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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