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2e69886a02
e.g. if a 60fps output is configured, we can only produce a single field of cea608 that must alternate between field 1 and field 2. Part-of: <https://gitlab.freedesktop.org/gstreamer/gstreamer/-/merge_requests/2019>
98 lines
3 KiB
C
98 lines
3 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_CCCONVERTER_H__
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#define __GST_CCCONVERTER_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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G_BEGIN_DECLS
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#define GST_TYPE_CCCONVERTER \
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(gst_cc_converter_get_type())
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#define GST_CCCONVERTER(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_CCCONVERTER,GstCCConverter))
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#define GST_CCCONVERTER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_CCCONVERTER,GstCCConverterClass))
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#define GST_IS_CCCONVERTER(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_CCCONVERTER))
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#define GST_IS_CCCONVERTER_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_CCCONVERTER))
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typedef struct _GstCCConverter GstCCConverter;
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typedef struct _GstCCConverterClass GstCCConverterClass;
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#define MAX_CDP_PACKET_LEN 256
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#define MAX_CEA608_LEN 32
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typedef enum {
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GST_CC_CONVERTER_CDP_MODE_TIME_CODE = (1<<0),
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GST_CC_CONVERTER_CDP_MODE_CC_DATA = (1<<1),
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GST_CC_CONVERTER_CDP_MODE_CC_SVC_INFO = (1<<2)
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} GstCCConverterCDPMode;
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struct _GstCCConverter
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{
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GstBaseTransform parent;
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GstCCConverterCDPMode cdp_mode;
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GstVideoCaptionType input_caption_type;
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GstVideoCaptionType output_caption_type;
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/* CDP sequence numbers when outputting CDP */
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guint16 cdp_hdr_sequence_cntr;
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gint in_fps_n, in_fps_d;
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gint out_fps_n, out_fps_d;
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/* for framerate differences, we need to keep previous/next frames in order
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* to split/merge data across multiple input or output buffers. The data is
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* stored as cc_data */
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guint8 scratch_cea608_1[MAX_CEA608_LEN];
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guint scratch_cea608_1_len;
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guint8 scratch_cea608_2[MAX_CEA608_LEN];
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guint scratch_cea608_2_len;
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guint8 scratch_ccp[MAX_CDP_PACKET_LEN];
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guint scratch_ccp_len;
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guint input_frames;
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guint output_frames;
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GstVideoTimeCode current_output_timecode;
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/* previous buffer for copying metas onto */
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GstBuffer *previous_buffer;
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/* used for tracking which field to write across output buffer boundaries */
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gboolean last_cea608_written_was_field1;
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};
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struct _GstCCConverterClass
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{
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GstBaseTransformClass parent_class;
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};
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GType gst_cc_converter_get_type (void);
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GST_ELEMENT_REGISTER_DECLARE (ccconverter);
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G_END_DECLS
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#endif /* __GST_CCCONVERTER_H__ */
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