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d1501f0952
When using this mode each frame is split in two fields, each one being transferred using its own buffer. This is implemented with the V4L2_FIELD_ALTERNATE field format in v4l2. This mode is enabled using a caps filter such as "v4l2src ! video/x-raw\(format:Interlaced\)" Here are the main changes related to this feature: - use the INTERLACED caps feature with this mode. - in this mode both fields of a given frame have the same sequence/offset so adjust the algorithm checking for lost field/frame accordingly. - double pool's min number of buffers as each frame requires 2 buffers. Fix #504 Co-authored-by: Zeeshan Ali <zeenix@collabora.co.uk>
84 lines
2.1 KiB
C
84 lines
2.1 KiB
C
/* GStreamer
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*
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* Copyright (C) 2001-2002 Ronald Bultje <rbultje@ronald.bitfreak.net>
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* 2006 Edgard Lima <edgard.lima@gmail.com>
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*
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* gstv4l2src.h: BT8x8/V4L2 source element
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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_V4L2SRC_H__
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#define __GST_V4L2SRC_H__
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#include <gstv4l2object.h>
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#include <gstv4l2bufferpool.h>
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G_BEGIN_DECLS
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#define GST_TYPE_V4L2SRC \
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(gst_v4l2src_get_type())
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#define GST_V4L2SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_V4L2SRC,GstV4l2Src))
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#define GST_V4L2SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_V4L2SRC,GstV4l2SrcClass))
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#define GST_IS_V4L2SRC(obj) \
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(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_V4L2SRC))
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#define GST_IS_V4L2SRC_CLASS(klass) \
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(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_V4L2SRC))
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typedef struct _GstV4l2Src GstV4l2Src;
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typedef struct _GstV4l2SrcClass GstV4l2SrcClass;
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/**
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* GstV4l2Src:
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*
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* Opaque object.
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*/
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struct _GstV4l2Src
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{
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GstPushSrc pushsrc;
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/*< private >*/
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GstV4l2Object * v4l2object;
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guint64 offset;
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gboolean next_offset_same;
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/* offset adjust after renegotiation */
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guint64 renegotiation_adjust;
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GstClockTime ctrl_time;
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gboolean pending_set_fmt;
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/* Timestamp sanity check */
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GstClockTime last_timestamp;
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gboolean has_bad_timestamp;
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};
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struct _GstV4l2SrcClass
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{
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GstPushSrcClass parent_class;
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GList *v4l2_class_devices;
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};
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GType gst_v4l2src_get_type (void);
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G_END_DECLS
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#endif /* __GST_V4L2SRC_H__ */
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