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a9b40eebc0
Otherwise decklink seems to hold onto the latest frame and may cause a flash in the output if the played sequence has a framerate less than the video output. Scenario is play for N seconds, pause, flushing seek to some other position, play again. Each of the play sequences would normally start at 0 with the decklink time. As a result, the latest frame from the previous sequence is kept alive waiting for it's timestamp to pass before either dropping (if a subsequent frame in the new sequence overrides it) or displayed causing the out of place frame to be displayed. This is also supported by the debug logs from the decklink video sink element where a ScheduledFrameCompleted() callback would not occur for the frame until the above had happened. It was timing related as to whether the frame was displayed based on the decklink refresh cycle (which seems to be 16ms here), when the frame was scheduled by the sink and the difference between the 'time since vblank' of the two play requests (and thus start times of scheduled playback).
81 lines
2.5 KiB
C
81 lines
2.5 KiB
C
/* GStreamer
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*
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* Copyright (C) 2011 David Schleef <ds@schleef.org>
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* Copyright (C) 2014 Sebastian Dröge <sebastian@centricular.com>
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
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* Boston, MA 02110-1301, USA.
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*/
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#ifndef __GST_DECKLINK_VIDEO_SINK_H__
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#define __GST_DECKLINK_VIDEO_SINK_H__
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#include <gst/gst.h>
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#include <gst/base/base.h>
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#include <gst/video/video.h>
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#include "gstdecklink.h"
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G_BEGIN_DECLS
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#define GST_TYPE_DECKLINK_VIDEO_SINK \
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(gst_decklink_video_sink_get_type())
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#define GST_DECKLINK_VIDEO_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj), GST_TYPE_DECKLINK_VIDEO_SINK, GstDecklinkVideoSink))
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#define GST_DECKLINK_VIDEO_SINK_CAST(obj) \
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((GstDecklinkVideoSink*)obj)
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#define GST_DECKLINK_VIDEO_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass), GST_TYPE_DECKLINK_VIDEO_SINK, GstDecklinkVideoSinkClass))
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#define GST_IS_DECKLINK_VIDEO_SINK(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj), GST_TYPE_DECKLINK_VIDEO_SINK))
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#define GST_IS_DECKLINK_VIDEO_SINK_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass), GST_TYPE_DECKLINK_VIDEO_SINK))
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typedef struct _GstDecklinkVideoSink GstDecklinkVideoSink;
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typedef struct _GstDecklinkVideoSinkClass GstDecklinkVideoSinkClass;
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struct _GstDecklinkVideoSink
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{
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GstBaseSink parent;
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GstDecklinkModeEnum mode;
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gint device_number;
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GstDecklinkVideoFormat video_format;
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BMDTimecodeFormat timecode_format;
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BMDKeyerMode keyer_mode;
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gint keyer_level;
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GstVideoInfo info;
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GstClockTime internal_base_time;
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GstClockTime external_base_time;
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GstClockTime scheduled_stop_time;
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GstDecklinkOutput *output;
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};
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struct _GstDecklinkVideoSinkClass
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{
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GstBaseSinkClass parent_class;
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};
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GType gst_decklink_video_sink_get_type (void);
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void gst_decklink_video_sink_convert_to_internal_clock (GstDecklinkVideoSink * self,
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GstClockTime * timestamp, GstClockTime * duration);
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G_END_DECLS
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#endif /* __GST_DECKLINK_VIDEO_SINK_H__ */
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