MoonWorks/src/Audio/StaticSoundInstance.cs

using System;

namespace MoonWorks.Audio
{
    public class StaticSoundInstance : SoundInstance
    {
        public StaticSound Parent { get; }

        private SoundState _state = SoundState.Stopped;
        public override SoundState State
        {
            get
            {
                FAudio.FAudioSourceVoice_GetState(
                    Handle,
                    out var state,
                    FAudio.FAUDIO_VOICE_NOSAMPLESPLAYED
                );
                if (state.BuffersQueued == 0)
                {
                    Stop(true);
                }

                return _state;
            }

            protected set
            {
                _state = value;
            }
        }

        internal StaticSoundInstance(
            AudioDevice device,
            StaticSound parent,
            bool is3D,
            bool loop
        ) : base(device, parent.Channels, parent.SamplesPerSecond, is3D, loop)
        {
            Parent = parent;
        }

        public override void Play()
        {
            if (State == SoundState.Playing)
            {
                return;
            }

            if (Loop)
            {
                Parent.Handle.LoopCount = 255;
                Parent.Handle.LoopBegin = Parent.LoopStart;
                Parent.Handle.LoopLength = Parent.LoopLength;
            }
            else
            {
                Parent.Handle.LoopCount = 0;
                Parent.Handle.LoopBegin = 0;
                Parent.Handle.LoopLength = 0;
            }

            FAudio.FAudioSourceVoice_SubmitSourceBuffer(
                Handle,
                ref Parent.Handle,
                IntPtr.Zero
            );

            FAudio.FAudioSourceVoice_Start(Handle, 0, 0);
            State = SoundState.Playing;
        }

        public override void Pause()
        {
            if (State == SoundState.Paused)
            {
                FAudio.FAudioSourceVoice_Stop(Handle, 0, 0);
                State = SoundState.Paused;
            }
        }

        public override void Stop(bool immediate = true)
        {
            if (immediate)
            {
                FAudio.FAudioSourceVoice_Stop(Handle, 0, 0);
                FAudio.FAudioSourceVoice_FlushSourceBuffers(Handle);
                State = SoundState.Stopped;
            }
            else
            {
                FAudio.FAudioSourceVoice_ExitLoop(Handle, 0);
            }
        }
    }
}