cae2b38614
In a previous version of the clock time conversion code, scheduled playback used to be started (from 0) when transitioning to PLAYING and stopped when transitioning PLAYING->PAUSED. This worked fine when converting running times using the internal clock. However, now the decklink clock will produce values that are monotonically increasing and do not reset to 0 at the same moments as running time anymore. This means that the clock adjustments could attempt to convert a small running time based on a large clock time e.g. after pausing for many hours. As the adjustment code is a simple linear interpolation based on the current clock times (large) using the provided value (small), the small differences in the rate could result in very large differences in the output time. Fix by instead using both internal and external clock times based on the values that gst_clock_get_calibration() will return. By doing so, small changes in the rate calculations between the internal and external clock times will not result in potentially large differences in the output internal time from gst_clock_unadjust_with_calibration(). Fixes https://gitlab.freedesktop.org/gstreamer/gstreamer/-/issues/4197 Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/9267>
101 lines
3.0 KiB
C
101 lines
3.0 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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gint64 persistent_id;
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GstDecklinkVideoFormat video_format;
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GstDecklinkProfileId profile_id;
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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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GstDecklinkOutput *output;
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GstVideoVBIEncoder *vbiencoder;
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GstVideoFormat anc_vformat;
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gint caption_line;
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guint16 cdp_hdr_sequence_cntr;
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gint afd_bar_line;
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GstDecklinkMappingFormat mapping_format;
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gboolean initial_sync;
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GQueue *pending_frames;
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gboolean have_light_level;
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GstVideoContentLightLevel light_level;
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gboolean have_mastering_info;
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GstVideoMasteringDisplayInfo mastering_info;
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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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GST_ELEMENT_REGISTER_DECLARE (decklinkvideosink);
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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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