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videoencoder: Use video marker flag to signal end of frame

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This marker is optional, its name refer to RTP marker bit. This mark can
be use to reduce latency in various use cases. With the split between
finish_frame() and finish_subframe() we will now be able to identitfy
the last subframe with no latency.

In order to detail the use of GST_BUFFER_FLAG_MARKER in a video
use case, the flag GST_VIDEO_BUFFER_FLAG_MARKER has been introduced
with a proper documentation clarifying marker's role.
This commit is contained in:
Stéphane Cerveau 2019-09-25 10:45:28 +02:00 committed by GStreamer Merge Bot
parent 3e32896912
commit 7013a58874
2 changed files with 10 additions and 0 deletions
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6
gst-libs/gst/video/gstvideoencoder.c
View file

@ -2392,6 +2392,12 @@ gst_video_encoder_finish_frame (GstVideoEncoder * encoder,
GST_BUFFER_DTS (frame->output_buffer) = frame->dts;
GST_BUFFER_DURATION (frame->output_buffer) = frame->duration;
/* At this stage we have a full frame in subframe use case ,
* let's mark it to enabled some latency optimization
* in some uses cases like RTP. */
GST_BUFFER_FLAG_SET (frame->output_buffer, GST_VIDEO_BUFFER_FLAG_MARKER);
GST_OBJECT_LOCK (encoder);
/* update rate estimate */
priv->bytes += gst_buffer_get_size (frame->output_buffer);

4
gst-libs/gst/video/video-frame.h
View file

@ -176,6 +176,8 @@ gboolean gst_video_frame_copy_plane (GstVideoFrame *dest, const GstVideoFr
* @GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD: The video frame has the bottom field only. This is
* the same as GST_VIDEO_BUFFER_FLAG_ONEFIELD
* (GST_VIDEO_BUFFER_FLAG_TFF flag unset) (Since: 1.16).
* @GST_VIDEO_BUFFER_FLAG_MARKER: The #GstBuffer contains the end of a video field or frame
* boundary such as the last subframe or packet (Since: 1.18).
* @GST_VIDEO_BUFFER_FLAG_LAST: Offset to define more flags
*
* Additional video buffer flags. These flags can potentially be used on any
@ -197,6 +199,8 @@ typedef enum {
GST_VIDEO_BUFFER_FLAG_ONEFIELD,
GST_VIDEO_BUFFER_FLAG_BOTTOM_FIELD = GST_VIDEO_BUFFER_FLAG_ONEFIELD,
GST_VIDEO_BUFFER_FLAG_MARKER = GST_BUFFER_FLAG_MARKER,
GST_VIDEO_BUFFER_FLAG_LAST = (GST_BUFFER_FLAG_LAST << 8)
} GstVideoBufferFlags;