/// <summary>
/// Creates a new instance of a Overlay renderer component. This component is identical to the <see cref="MMALVideoRenderer"/> class, however it provides
/// the ability to overlay a static source onto the render overlay.
/// </summary>
/// <param name="parent">The parent renderer which is being used to overlay onto the display.</param>
/// <param name="config">The configuration for rendering a static preview overlay.</param>
/// <param name="source">A reference to the current stream being used in the overlay.</param>
public MMALOverlayRenderer(MMALVideoRenderer parent, PreviewOverlayConfiguration config, byte[] source)
: base(config)
{
this.Source = source;
this.ParentRenderer = parent;
this.OverlayConfiguration = config;
parent.Overlays.Add(this);
this.Inputs[0] = new OverlayPort(this.Inputs[0]);
if (config != null)
{
if (config.Resolution.Width > 0 && config.Resolution.Height > 0)
{
this.Inputs[0].Resolution = config.Resolution;
this.Inputs[0].Crop = new Rectangle(0, 0, config.Resolution.Width, config.Resolution.Height);
}
else
{
this.Inputs[0].Resolution = parent.Inputs[0].Resolution;
this.Inputs[0].Crop = new Rectangle(0, 0, parent.Inputs[0].Resolution.Width, parent.Inputs[0].Resolution.Height);
}
this.Inputs[0].FrameRate = new MMAL_RATIONAL_T(0, 0);
if (config.Encoding == null)
{
var sourceLength = source.Length;
var planeSize = this.Inputs[0].Resolution.Pad();
var planeLength = Math.Floor((double)planeSize.Width * planeSize.Height);
if (Math.Floor(sourceLength / planeLength) == 3)
{
config.Encoding = MMALEncoding.RGB24;
}
else if (Math.Floor(sourceLength / planeLength) == 4)
{
config.Encoding = MMALEncoding.RGBA;
}
else
{
throw new PiCameraError("Unable to determine encoding from image size.");
}
}
this.Inputs[0].NativeEncodingType = config.Encoding.EncodingVal;
}
if (!this.AllowedEncodings.Any(c => c.EncodingVal == this.Inputs[0].NativeEncodingType))
{
throw new PiCameraError($"Incompatible encoding type for use with Preview Render overlay {MMALEncodingHelpers.ParseEncoding(this.Inputs[0].NativeEncodingType).EncodingName}.");
}
this.Inputs[0].Commit();
this.Control.Start();
this.Inputs[0].Start();
}
/// <summary>
/// Creates a new instance of a Overlay renderer component. This component is identical to the <see cref="MMALVideoRenderer"/> class, however it provides
/// the ability to overlay a static source onto the render overlay.
/// </summary>
/// <param name="parent">The parent renderer which is being used to overlay onto the display.</param>
/// <param name="config">The configuration for rendering a static preview overlay.</param>
/// <param name="source">A reference to the current stream being used in the overlay.</param>
public MMALOverlayRenderer(MMALVideoRenderer parent, PreviewOverlayConfiguration config, byte[] source)
: base(config)
{
this.Source = source;
this.ParentRenderer = parent;
this.OverlayConfiguration = config;
parent.Overlays.Add(this);
if (config != null)
{
var width = 0;
var height = 0;
if (config.Resolution.Width > 0 && config.Resolution.Height > 0)
{
width = config.Resolution.Width;
height = config.Resolution.Height;
}
else
{
width = parent.Inputs[0].Resolution.Width;
height = parent.Inputs[0].Resolution.Height;
}
if (config.Encoding == null)
{
var sourceLength = source.Length;
var planeSize = this.Inputs[0].Resolution.Pad();
var planeLength = Math.Floor((double)planeSize.Width * planeSize.Height);
if (Math.Floor(sourceLength / planeLength) == 3)
{
config.Encoding = MMALEncoding.RGB24;
}
else if (Math.Floor(sourceLength / planeLength) == 4)
{
config.Encoding = MMALEncoding.RGBA;
}
else
{
throw new PiCameraError("Unable to determine encoding from image size.");
}
}
if (!this.AllowedEncodings.Any(c => c.EncodingVal == this.Inputs[0].NativeEncodingType))
{
throw new PiCameraError($"Incompatible encoding type for use with Preview Render overlay {this.Inputs[0].NativeEncodingType.ParseEncoding().EncodingName}.");
}
var portConfig = new MMALPortConfig(config.Encoding, null, width, height, 0, 0, 0, false, null, 0, 0);
this.ConfigureInputPort(portConfig, null);
this.Control.Start();
this.Inputs[0].Start();
}
}
