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It can be used to discard closed captions from the input pad if the matching video buffer already held closed captions. It is useful in a scenario where captions are generated for an AV stream, but the incoming stream already has embedded captions for some intervals, and those original captions should be preferred. It can also be used to make sure input CC meta is always dropped, the default behavior remains to append aggregated CC to whatever CC meta was already present on the input video buffer Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/6072>
104 lines
3.2 KiB
C
104 lines
3.2 KiB
C
/*
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* GStreamer
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* Copyright (C) 2018 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_CCCOMBINER_H__
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#define __GST_CCCOMBINER_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 "ccutils.h"
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G_BEGIN_DECLS
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#define GST_TYPE_CCCOMBINER \
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(gst_cc_combiner_get_type())
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#define GST_CCCOMBINER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CCCOMBINER,GstCCCombiner))
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#define GST_CCCOMBINER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CCCOMBINER,GstCCCombinerClass))
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#define GST_IS_CCCOMBINER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CCCOMBINER))
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#define GST_IS_CCCOMBINER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CCCOMBINER))
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typedef struct _GstCCCombiner GstCCCombiner;
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typedef struct _GstCCCombinerClass GstCCCombinerClass;
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/**
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* GstCCCombinerInputProcessing:
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* @CCCOMBINER_INPUT_PROCESSING_APPEND: append aggregated CC to existing metas on video buffers
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* @CCCOMBINER_INPUT_PROCESSING_DROP: drop existing CC metas on input video buffers
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* @CCCOMBINER_INPUT_PROCESSING_FAVOR: discard aggregated CC when input video buffers hold CC metas already
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*
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* Possible processing types for the input-meta-processing property.
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*
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* Since: 1.26
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*/
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typedef enum {
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CCCOMBINER_INPUT_PROCESSING_APPEND = 0,
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CCCOMBINER_INPUT_PROCESSING_DROP,
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CCCOMBINER_INPUT_PROCESSING_FAVOR,
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} GstCCCombinerInputProcessing;
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struct _GstCCCombiner
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{
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GstAggregator parent;
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gint video_fps_n, video_fps_d;
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gboolean progressive;
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GstClockTime previous_video_running_time_end;
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GstClockTime current_video_running_time;
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GstClockTime current_video_running_time_end;
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GstBuffer *current_video_buffer;
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GArray *current_frame_captions;
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GstVideoCaptionType caption_type;
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gboolean prop_schedule;
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guint prop_max_scheduled;
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gboolean prop_output_padding;
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CCBufferCea608PaddingStrategy prop_cea608_padding_strategy;
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GstClockTime prop_cea608_valid_padding_timeout;
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GstClockTime prop_schedule_timeout;
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GstCCCombinerInputProcessing prop_input_meta_processing;
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gboolean schedule;
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guint max_scheduled;
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gboolean output_padding;
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guint current_scheduled;
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GstClockTime last_caption_ts;
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CCBuffer *cc_buffer;
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guint16 cdp_hdr_sequence_cntr;
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const struct cdp_fps_entry *cdp_fps_entry;
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};
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struct _GstCCCombinerClass
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{
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GstAggregatorClass parent_class;
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};
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GType gst_cc_combiner_get_type (void);
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GST_ELEMENT_REGISTER_DECLARE (cccombiner);
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G_END_DECLS
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#endif /* __GST_CCCOMBINER_H__ */
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