98 lines
3.9 KiB
C#
98 lines
3.9 KiB
C#
using Unosquare.Swan;
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using System;
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using System.Text;
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namespace Unosquare.RaspberryIO.Camera {
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/// <summary>
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/// Represents the raspivid camera settings for video capture functionality
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/// </summary>
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/// <seealso cref="CameraSettingsBase" />
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public class CameraVideoSettings : CameraSettingsBase {
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/// <inheritdoc />
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public override String CommandName => "raspivid";
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/// <summary>
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/// Use bits per second, so 10Mbits/s would be -b 10000000. For H264, 1080p30 a high quality bitrate would be 15Mbits/s or more.
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/// Maximum bitrate is 25Mbits/s (-b 25000000), but much over 17Mbits/s won't show noticeable improvement at 1080p30.
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/// Default -1
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/// </summary>
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public Int32 CaptureBitrate { get; set; } = -1;
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/// <summary>
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/// Gets or sets the framerate.
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/// Default 25, range 2 to 30
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/// </summary>
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public Int32 CaptureFramerate { get; set; } = 25;
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/// <summary>
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/// Sets the intra refresh period (GoP) rate for the recorded video. H264 video uses a complete frame (I-frame) every intra
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/// refresh period, from which subsequent frames are based. This option specifies the number of frames between each I-frame.
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/// Larger numbers here will reduce the size of the resulting video, and smaller numbers make the stream less error-prone.
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/// </summary>
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public Int32 CaptureKeyframeRate { get; set; } = 25;
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/// <summary>
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/// Sets the initial quantisation parameter for the stream. Varies from approximately 10 to 40, and will greatly affect
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/// the quality of the recording. Higher values reduce quality and decrease file size. Combine this setting with a
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/// bitrate of 0 to set a completely variable bitrate.
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/// </summary>
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public Int32 CaptureQuantisation { get; set; } = 23;
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/// <summary>
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/// Gets or sets the profile.
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/// Sets the H264 profile to be used for the encoding.
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/// Default is Main mode
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/// </summary>
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public CameraH264Profile CaptureProfile { get; set; } = CameraH264Profile.Main;
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/// <summary>
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/// Forces the stream to include PPS and SPS headers on every I-frame. Needed for certain streaming cases
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/// e.g. Apple HLS. These headers are small, so don't greatly increase the file size.
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/// </summary>
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/// <value>
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/// <c>true</c> if [interleave headers]; otherwise, <c>false</c>.
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/// </value>
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public Boolean CaptureInterleaveHeaders { get; set; } = true;
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/// <summary>
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/// Switch on an option to display the preview after compression. This will show any compression artefacts in the preview window. In normal operation,
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/// the preview will show the camera output prior to being compressed. This option is not guaranteed to work in future releases.
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/// </summary>
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/// <value>
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/// <c>true</c> if [capture display preview encoded]; otherwise, <c>false</c>.
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/// </value>
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public Boolean CaptureDisplayPreviewEncoded { get; set; } = false;
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/// <inheritdoc />
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public override String CreateProcessArguments() {
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StringBuilder sb = new StringBuilder(base.CreateProcessArguments());
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_ = sb.Append($" -pf {this.CaptureProfile.ToString().ToLowerInvariant()}");
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if(this.CaptureBitrate < 0) {
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_ = sb.Append($" -b {this.CaptureBitrate.Clamp(0, 25000000).ToString(Ci)}");
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}
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if(this.CaptureFramerate >= 2) {
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_ = sb.Append($" -fps {this.CaptureFramerate.Clamp(2, 30).ToString(Ci)}");
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}
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if(this.CaptureDisplayPreview && this.CaptureDisplayPreviewEncoded) {
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_ = sb.Append(" -e");
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}
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if(this.CaptureKeyframeRate > 0) {
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_ = sb.Append($" -g {this.CaptureKeyframeRate.ToString(Ci)}");
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}
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if(this.CaptureQuantisation >= 0) {
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_ = sb.Append($" -qp {this.CaptureQuantisation.Clamp(0, 40).ToString(Ci)}");
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}
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if(this.CaptureInterleaveHeaders) {
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_ = sb.Append(" -ih");
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}
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return sb.ToString();
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}
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}
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} |