Question

如何在适用于Windows 8.1的Windows应用商店应用中将MediaCapture更改为byte []。来自lib：

Windows.Media.Capture.MediaCapture asd = new Windows.Media.Capture.MediaCapture（）;

Thans！

Answer 1

我假设您想要从相机目前看到的内容中获取一个字节数组，尽管很难从您的问题中解释出来。

Microsoft github页面上有一个相关的示例，尽管它们的目标是Windows 10.您可能有兴趣迁移项目以获得此功能。

GetPreviewFrame：此示例将捕获预览帧而不是完整的照片，但它应该是一个很好的起点。一旦它有预览框架，它就可以编辑它上面的像素。

以下是相关部分：

# models.py

class Artist(db.Model):
    # ...
    tags = association_proxy('_tags', 'tag', 
        creator=lambda t: ArtistTag(tag=t))
    # ...

class Tag(db.Model):
    # ...
    artist = association_proxy('_artists', 'artist', 
        creator=lambda a: ArtistTag(artist=a))
    # ...

class ArtistTag(db.Model):
    # ...
    artist_id = db.Column(db.Integer, ForeignKey('artists.id'))
    artist = db.relationship('Artist', backref='_tags')
    tag_id = db.Column(db.Integer, ForeignKey('tags.id'))
    tag = db.relationship('Tag', backref='_artists')

# api/tag.py
from flask.ext.restful import Resource
from ..
class ListArtistTag(Resource):
    def get(self, id):
        # much safer in actual app
        return TagSchema(many=True)
               .dump(Artist.query.get(id).tags)
               .data

并在课堂外宣布：

private async Task GetPreviewFrameAsSoftwareBitmapAsync()
{
    // Get information about the preview
    var previewProperties = _mediaCapture.VideoDeviceController.GetMediaStreamProperties(MediaStreamType.VideoPreview) as VideoEncodingProperties;

    // Create the video frame to request a SoftwareBitmap preview frame
    var videoFrame = new VideoFrame(BitmapPixelFormat.Bgra8, (int)previewProperties.Width, (int)previewProperties.Height);

    // Capture the preview frame
    using (var currentFrame = await _mediaCapture.GetPreviewFrameAsync(videoFrame))
    {
        // Collect the resulting frame
        SoftwareBitmap previewFrame = currentFrame.SoftwareBitmap;

        // Add a simple green filter effect to the SoftwareBitmap
        EditPixels(previewFrame);
    }
}

private unsafe void EditPixels(SoftwareBitmap bitmap)
{
    // Effect is hard-coded to operate on BGRA8 format only
    if (bitmap.BitmapPixelFormat == BitmapPixelFormat.Bgra8)
    {
        // In BGRA8 format, each pixel is defined by 4 bytes
        const int BYTES_PER_PIXEL = 4;

        using (var buffer = bitmap.LockBuffer(BitmapBufferAccessMode.ReadWrite))
        using (var reference = buffer.CreateReference())
        {
            // Get a pointer to the pixel buffer
            byte* data;
            uint capacity;
            ((IMemoryBufferByteAccess)reference).GetBuffer(out data, out capacity);

            // Get information about the BitmapBuffer
            var desc = buffer.GetPlaneDescription(0);

            // Iterate over all pixels
            for (uint row = 0; row < desc.Height; row++)
            {
                for (uint col = 0; col < desc.Width; col++)
                {
                    // Index of the current pixel in the buffer (defined by the next 4 bytes, BGRA8)
                    var currPixel = desc.StartIndex + desc.Stride * row + BYTES_PER_PIXEL * col;

                    // Read the current pixel information into b,g,r channels (leave out alpha channel)
                    var b = data[currPixel + 0]; // Blue
                    var g = data[currPixel + 1]; // Green
                    var r = data[currPixel + 2]; // Red

                    // Boost the green channel, leave the other two untouched
                    data[currPixel + 0] = b;
                    data[currPixel + 1] = (byte)Math.Min(g + 80, 255);
                    data[currPixel + 2] = r;
                }
            }
        }
    }
}

仔细查看示例，了解如何获取所有详细信息。或者，要进行演练，您可以观看最近//版本/会议中的camera session，其中包括一些相机示例的演练。

如何将MediaCapture更改为Byte []

1 个答案: