From cee218a2dcdf8824c68778d0e0662a08e041e7fe Mon Sep 17 00:00:00 2001
From: cosmonaut <evan@moonside.games>
Date: Tue, 2 May 2023 16:23:52 -0700
Subject: [PATCH] implement StreamingSoundQoa

---
 lib/FAudio                     |   2 +-
 src/Audio/StreamingSoundQoa.cs | 103 +++++++++++++++++++++++++++++++++
 2 files changed, 104 insertions(+), 1 deletion(-)
 create mode 100644 src/Audio/StreamingSoundQoa.cs

diff --git a/lib/FAudio b/lib/FAudio
index c42b681..4f696ab 160000
--- a/lib/FAudio
+++ b/lib/FAudio
@@ -1 +1 @@
-Subproject commit c42b6814c2550bd757b25b9387c0881eb4860af7
+Subproject commit 4f696ab0735927872b8227d3f335040c53876e3a
diff --git a/src/Audio/StreamingSoundQoa.cs b/src/Audio/StreamingSoundQoa.cs
new file mode 100644
index 0000000..7550592
--- /dev/null
+++ b/src/Audio/StreamingSoundQoa.cs
@@ -0,0 +1,103 @@
+using System;
+using System.IO;
+using System.Runtime.InteropServices;
+
+namespace MoonWorks.Audio
+{
+	public class StreamingSoundQoa : StreamingSoundSeekable
+	{
+		private IntPtr QoaHandle;
+		private IntPtr FileDataPtr;
+
+		protected override int BUFFER_SIZE { get; }
+		public override bool AutoUpdate => true;
+
+		uint Channels;
+		uint FrameSize;
+		uint TotalSamplesPerChannel;
+
+		public unsafe static StreamingSoundQoa Load(AudioDevice device, string filePath)
+		{
+			var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
+			var fileDataPtr = NativeMemory.Alloc((nuint) fileStream.Length);
+			var fileDataSpan = new Span<byte>(fileDataPtr, (int) fileStream.Length);
+			fileStream.ReadExactly(fileDataSpan);
+			fileStream.Close();
+
+			var qoaHandle = FAudio.qoa_open((char*) fileDataPtr, fileDataSpan.Length);
+			if (qoaHandle == 0)
+			{
+				NativeMemory.Free(fileDataPtr);
+				Logger.LogError("Error opening QOA file!");
+				throw new AudioLoadException("Error opening QOA file!");
+			}
+
+			FAudio.qoa_attributes(qoaHandle, out var frameSize, out var channels, out var sampleRate, out var totalSamplesPerChannel);
+
+			return new StreamingSoundQoa(
+				device,
+				(IntPtr) fileDataPtr,
+				qoaHandle,
+				channels,
+				sampleRate,
+				frameSize,
+				totalSamplesPerChannel
+			);
+		}
+
+		internal unsafe StreamingSoundQoa(
+			AudioDevice device,
+			IntPtr fileDataPtr, // MUST BE A NATIVE MEMORY HANDLE!!
+			IntPtr qoaHandle,
+			uint channels,
+			uint samplesPerSecond,
+			uint frameSize,
+			uint totalSamplesPerChannel
+		) : base(
+			device,
+			1,
+			16,
+			(ushort) (2 * channels),
+			(ushort) channels,
+			samplesPerSecond
+		) {
+			FileDataPtr = fileDataPtr;
+			QoaHandle = qoaHandle;
+			Channels = channels;
+			FrameSize = frameSize;
+			TotalSamplesPerChannel = totalSamplesPerChannel;
+		}
+
+		public override void Seek(uint sampleFrame)
+		{
+			FAudio.qoa_seek_frame(QoaHandle, (int) sampleFrame);
+		}
+
+		protected override unsafe void FillBuffer(
+			void* buffer,
+			int bufferLengthInBytes,
+			out int filledLengthInBytes,
+			out bool reachedEnd
+		) {
+			var lengthInShorts = bufferLengthInBytes / sizeof(short);
+
+			// NOTE: this function returns samples per channel! */
+			var samples = FAudio.qoa_decode_next_frame(QoaHandle, (short*) buffer);
+
+			var sampleCount = samples * Channels;
+			reachedEnd = sampleCount < lengthInShorts;
+			filledLengthInBytes = (int) (sampleCount * sizeof(short));
+		}
+
+		protected override unsafe void Destroy()
+		{
+			base.Destroy();
+
+			if (!IsDisposed)
+			{
+				FAudio.qoa_close(QoaHandle);
+				NativeMemory.Free((void*) FileDataPtr);
+			}
+		}
+	}
+}