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Add snapshot overloads

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This commit is contained in:
Malte Rosenbjerg 2020-08-08 20:13:50 +02:00
parent 1eb4959b5a
commit 9bf2093517
2 changed files with 59 additions and 21 deletions
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78
FFMpegCore/FFMpeg/FFMpeg.cs
View file

@ -7,6 +7,7 @@
using System.Drawing;
using System.IO;
using System.Linq;
using System.Threading.Tasks;
namespace FFMpegCore
{
@ -22,23 +23,35 @@ public static class FFMpeg
/// <returns>Bitmap with the requested snapshot.</returns>
public static bool Snapshot(MediaAnalysis source, string output, Size? size = null, TimeSpan? captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
if (Path.GetExtension(output) != FileExtension.Png)
output = Path.GetFileNameWithoutExtension(output) + FileExtension.Png;
size = PrepareSnapshotSize(source, size);
return FFMpegArguments
.FromSeekedFiles((source.Path, captureTime ?? TimeSpan.Zero))
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size)
.Seek(captureTime)
var arguments = BuildSnapshotArguments(source, size, captureTime);
return arguments
.OutputToFile(output)
.ProcessSynchronously();
}
/// <summary>
/// Saves a 'png' thumbnail from the input video to drive
/// </summary>
/// <param name="source">Source video analysis</param>
/// <param name="output">Output video file path</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static Task<bool> SnapshotAsync(MediaAnalysis source, string output, Size? size = null, TimeSpan? captureTime = null)
{
if (Path.GetExtension(output) != FileExtension.Png)
output = Path.GetFileNameWithoutExtension(output) + FileExtension.Png;
var arguments = BuildSnapshotArguments(source, size, captureTime);
return arguments
.OutputToFile(output)
.ProcessAsynchronously();
}
/// <summary>
/// Saves a 'png' thumbnail to an in-memory bitmap
/// </summary>
/// <param name="source">Source video file.</param>
@ -47,17 +60,10 @@ public static bool Snapshot(MediaAnalysis source, string output, Size? size = nu
/// <returns>Bitmap with the requested snapshot.</returns>
public static Bitmap Snapshot(MediaAnalysis source, Size? size = null, TimeSpan? captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
size = PrepareSnapshotSize(source, size);
var arguments = BuildSnapshotArguments(source, size, captureTime);
using var ms = new MemoryStream();
FFMpegArguments
.FromInputFiles(source.Path)
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size)
.Seek(captureTime)
arguments
.ForceFormat("rawvideo")
.OutputToPipe(new StreamPipeSink(ms))
.ProcessSynchronously();
@ -65,6 +71,38 @@ public static Bitmap Snapshot(MediaAnalysis source, Size? size = null, TimeSpan?
ms.Position = 0;
return new Bitmap(ms);
}
/// <summary>
/// Saves a 'png' thumbnail to an in-memory bitmap
/// </summary>
/// <param name="source">Source video file.</param>
/// <param name="captureTime">Seek position where the thumbnail should be taken.</param>
/// <param name="size">Thumbnail size. If width or height equal 0, the other will be computed automatically.</param>
/// <returns>Bitmap with the requested snapshot.</returns>
public static async Task<Bitmap> SnapshotAsync(MediaAnalysis source, Size? size = null, TimeSpan? captureTime = null)
{
var arguments = BuildSnapshotArguments(source, size, captureTime);
using var ms = new MemoryStream();
await arguments
.ForceFormat("rawvideo")
.OutputToPipe(new StreamPipeSink(ms))
.ProcessAsynchronously();
ms.Position = 0;
return new Bitmap(ms);
}
private static FFMpegArguments BuildSnapshotArguments(MediaAnalysis source, Size? size = null, TimeSpan? captureTime = null)
{
captureTime ??= TimeSpan.FromSeconds(source.Duration.TotalSeconds / 3);
size = PrepareSnapshotSize(source, size);
return FFMpegArguments
.FromSeekedFiles((source.Path, captureTime ?? TimeSpan.Zero))
.WithVideoCodec(VideoCodec.Png)
.WithFrameOutputCount(1)
.Resize(size);
}
private static Size? PrepareSnapshotSize(MediaAnalysis source, Size? size)
{

2
FFMpegCore/FFMpeg/FFMpegArgumentProcessor.cs
View file

@ -46,7 +46,7 @@ public FFMpegArgumentProcessor CancellableThrough(out Action cancel)
}
public bool ProcessSynchronously(bool throwOnError = true)
{
var instance = PrepareInstance(out var cancellationTokenSource);
using var instance = PrepareInstance(out var cancellationTokenSource);
var errorCode = -1;
void OnCancelEvent(object sender, EventArgs args)