From 8dd51501d0dd27e573edde021509634f56f249df Mon Sep 17 00:00:00 2001
From: YURI FEDOSEEV <yuri.fedoseev@helixleisure.com>
Date: Fri, 5 May 2023 15:12:46 +0800
Subject: [PATCH] v4l2videoenc: support force keyframe event in v4l2 encoder

Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/4663>
---
 .../gst-plugins-good/sys/v4l2/gstv4l2videoenc.c       | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videoenc.c b/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videoenc.c
index a78bf540d5..2dee813720 100644
--- a/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videoenc.c
+++ b/subprojects/gst-plugins-good/sys/v4l2/gstv4l2videoenc.c
@@ -817,6 +817,17 @@ gst_v4l2_video_enc_handle_frame (GstVideoEncoder * encoder,
   }
 
   if (frame->input_buffer) {
+    /* Process force keyframe event if it was passed */
+    if (GST_VIDEO_CODEC_FRAME_IS_FORCE_KEYFRAME (frame)) {
+      struct v4l2_control ctrl = { V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME, 1 };
+      if (self->v4l2output->ioctl (self->v4l2output->video_fd, VIDIOC_S_CTRL,
+              &ctrl) < 0)
+        GST_ELEMENT_WARNING (self, RESOURCE, FAILED,
+            (_("Failed to force keyframe.")),
+            ("VIDIOC_S_CTRL (V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME) failed: %s (%d)",
+                g_strerror (errno), errno));
+    }
+
     GST_VIDEO_ENCODER_STREAM_UNLOCK (encoder);
     GST_LOG_OBJECT (encoder, "Passing buffer with frame number %u",
         frame->system_frame_number);