FlashCap/FlashCap.Core/CaptureDevice.cs at ca7454e1eaa1e31f93441e17480b02df656e45ef · kekyo/FlashCap · GitHub

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////////////////////////////////////////////////////////////////////////////
//
// FlashCap - Independent camera capture library.
// Copyright (c) Kouji Matsui (@kekyo@mi.kekyo.net)
//
// Licensed under Apache-v2: https://opensource.org/licenses/Apache-2.0
//
////////////////////////////////////////////////////////////////////////////

using FlashCap.Internal;
using System;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;

namespace FlashCap;

public abstract class CaptureDevice :
#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1
    IAsyncDisposable,
#endif
    IDisposable
{
    private readonly AsyncLock locker = new();

    protected CaptureDevice(object identity, string name)
    {
        this.Identity = identity;
        this.Name = name;
    }

#if NET45_OR_GREATER || NETSTANDARD || NETCOREAPP
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
    public void Dispose() =>
        _ = this.DisposeAsync().ConfigureAwait(true);

#if NETCOREAPP3_0_OR_GREATER || NETSTANDARD2_1
    ValueTask IAsyncDisposable.DisposeAsync() =>
        new(this.DisposeAsync());
#endif

    public async Task DisposeAsync()
    {
        using var _ = await locker.LockAsync(default).
            ConfigureAwait(true);

        await this.OnDisposeAsync().
            ConfigureAwait(true);
    }

    protected virtual Task OnDisposeAsync() =>
        TaskCompat.CompletedTask;

    protected abstract Task OnInitializeAsync(
        VideoCharacteristics characteristics,
        TranscodeFormats transcodeFormat,
        FrameProcessor frameProcessor,
        CancellationToken ct);

    public object Identity { get; }
    public string Name { get; }

    public virtual bool HasPropertyPage => false;

    public VideoCharacteristics Characteristics { get; protected set; } = null!;
    public bool IsRunning { get; protected set; }

    protected abstract Task OnStartAsync(CancellationToken ct);
    protected abstract Task OnStopAsync(CancellationToken ct);

    protected abstract void OnCapture(
        IntPtr pData, int size, long timestampMicroseconds, long frameIndex, PixelBuffer buffer);

    protected virtual Task<bool> OnShowPropertyPageAsync(
        IntPtr parentWindow, CancellationToken ct) =>
        TaskCompat.FromResult(false);

    //////////////////////////////////////////////////////////////////////////

    internal Task InternalInitializeAsync(
        VideoCharacteristics characteristics,
        TranscodeFormats transcodeFormat,
        FrameProcessor frameProcessor,
        CancellationToken ct) =>
        this.OnInitializeAsync(characteristics, transcodeFormat, frameProcessor, ct);

    internal async Task InternalStartAsync(CancellationToken ct)
    {
        using var _ = await locker.LockAsync(ct).
            ConfigureAwait(false);

        await this.OnStartAsync(ct);
    }

    internal async Task InternalStopAsync(CancellationToken ct)
    {
        using var _ = await locker.LockAsync(ct).
            ConfigureAwait(false);

        await this.OnStopAsync(ct);
    }

#if NET45_OR_GREATER || NETSTANDARD || NETCOREAPP
    [MethodImpl(MethodImplOptions.AggressiveInlining)]
#endif
    internal void InternalOnCapture(
        IntPtr pData, int size, long timestampMicroseconds, long frameIndex, PixelBuffer buffer) =>
        this.OnCapture(pData, size, timestampMicroseconds, frameIndex, buffer);

    internal async Task<bool> InternalShowPropertyPageAsync(
        IntPtr parentWindow, CancellationToken ct)
    {
        using var _ = await locker.LockAsync(ct).
            ConfigureAwait(false);

        return await this.OnShowPropertyPageAsync(parentWindow, ct);
    }
}