Haydn: Part 1 (#2007)

* Haydn: Part 1

Based on my reverse of audio 11.0.0.

As always, core implementation under LGPLv3 for the same reasons as for Amadeus.

This place the bases of a more flexible audio system while making audout & audin accurate.

This have the following improvements:
- Complete reimplementation of audout and audin.
- Audin currently only have a dummy backend.
- Dramatically reduce CPU usage by up to 50% in common cases (SoundIO and OpenAL).
- Audio Renderer now can output to 5.1 devices when supported.
- Audio Renderer init its backend on demand instead of keeping two up all the time.
- All backends implementation are now in their own project.
- Ryujinx.Audio.Renderer was renamed Ryujinx.Audio and was refactored because of this.

As a note, games having issues with OpenAL haven't improved and will not
because of OpenAL design (stopping when buffers finish playing causing
possible audio "pops" when buffers are very small).

* Update for latest hexkyz's edits on Switchbrew

* audren: Rollback channel configuration changes

* Address gdkchan's comments

* Fix typo in OpenAL backend driver

* Address last comments

* Fix a nit

* Address gdkchan's comments

3 files changed, 133 insertions, 0 deletions

diff --git a/Ryujinx.Audio/Renderer/Server/Types/AudioRendererExecutionMode.cs b/Ryujinx.Audio/Renderer/Server/Types/AudioRendererExecutionMode.cs
new file mode 100644
index 00000000..7bb0507c
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Server/Types/AudioRendererExecutionMode.cs
@@ -0,0 +1,36 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Server.Types
+{
+    /// <summary>
+    /// The execution mode of an <see cref="AudioRenderSystem"/>.
+    /// </summary>
+    public enum AudioRendererExecutionMode : byte
+    {
+        /// <summary>
+        /// Automatically send commands to the DSP at a fixed rate (see <see cref="AudioRenderSystem.SendCommands"/>
+        /// </summary>
+        Auto,
+
+        /// <summary>
+        /// Audio renderer operation needs to be done manually via ExecuteAudioRenderer.
+        /// </summary>
+        /// <remarks>This is not supported on the DSP and is as such stubbed.</remarks>
+        Manual
+    }
+}
\ No newline at end of file
diff --git a/Ryujinx.Audio/Renderer/Server/Types/AudioRendererRenderingDevice.cs b/Ryujinx.Audio/Renderer/Server/Types/AudioRendererRenderingDevice.cs
new file mode 100644
index 00000000..f89086f6
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Server/Types/AudioRendererRenderingDevice.cs
@@ -0,0 +1,41 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Server.Types
+{
+    /// <summary>
+    /// The rendering device of an <see cref="AudioRenderSystem"/>.
+    /// </summary>
+    public enum AudioRendererRenderingDevice : byte
+    {
+        /// <summary>
+        /// Rendering is performed on the DSP.
+        /// </summary>
+        /// <remarks>
+        /// Only supports <see cref="AudioRendererExecutionMode.Auto"/>.
+        /// </remarks>
+        Dsp,
+
+        /// <summary>
+        /// Rendering is performed on the CPU.
+        /// </summary>
+        /// <remarks>
+        /// Only supports <see cref="AudioRendererExecutionMode.Manual"/>.
+        /// </remarks>
+        Cpu
+    }
+}
diff --git a/Ryujinx.Audio/Renderer/Server/Types/PlayState.cs b/Ryujinx.Audio/Renderer/Server/Types/PlayState.cs
new file mode 100644
index 00000000..7f8895c9
--- /dev/null
+++ b/Ryujinx.Audio/Renderer/Server/Types/PlayState.cs
@@ -0,0 +1,56 @@
+//
+// Copyright (c) 2019-2021 Ryujinx
+//
+// This program is free software: you can redistribute it and/or modify
+// it under the terms of the GNU Lesser General Public License as published by
+// the Free Software Foundation, either version 3 of the License, or
+// (at your option) any later version.
+//
+// This program is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU Lesser General Public License for more details.
+//
+// You should have received a copy of the GNU Lesser General Public License
+// along with this program.  If not, see <https://www.gnu.org/licenses/>.
+//
+
+namespace Ryujinx.Audio.Renderer.Server.Types
+{
+    /// <summary>
+    /// The internal play state of a <see cref="Voice.VoiceState"/>
+    /// </summary>
+    public enum PlayState
+    {
+        /// <summary>
+        /// The voice has been started and is playing.
+        /// </summary>
+        Started,
+
+        /// <summary>
+        /// The voice has been stopped.
+        /// </summary>
+        /// <remarks>
+        /// This cannot be directly set by user.
+        /// See <see cref="Stopping"/> for correct usage.
+        /// </remarks>
+        Stopped,
+
+        /// <summary>
+        /// The user asked the voice to be stopped.
+        /// </summary>
+        /// <remarks>
+        /// This is changed to the <see cref="Stopped"/> state after command generation.
+        /// <seealso cref="Voice.VoiceState.UpdateForCommandGeneration(Voice.VoiceContext)"/>
+        /// </remarks>
+        Stopping,
+
+        /// <summary>
+        /// The voice has been paused by user request.
+        /// </summary>
+        /// <remarks>
+        /// The user can resume to the <see cref="Started"/> state.
+        /// </remarks>
+        Paused
+    }
+}