gstreamer/gst/videorate/gstvideorate.h
Sebastian Dröge ec062ef3f2 videorate: Add property to force an output framerate
API: GstVideoRate:force-fps

Changing the framerate during playback is not possible
with a capsfilter downstream if upstream is not using
gst_pad_alloc_buffer(). In that case there's no way in
0.10 to signal to videorate that the preferred framerate
has changed.

This new property will force the output framerate to
a specific value and can be changed during playback.
2011-11-24 14:40:38 +01:00

92 lines
2.8 KiB
C

/* GStreamer
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 02111-1307, USA.
*/
#ifndef __GST_VIDEO_RATE_H__
#define __GST_VIDEO_RATE_H__
#include <gst/gst.h>
#include <gst/base/gstbasetransform.h>
G_BEGIN_DECLS
#define GST_TYPE_VIDEO_RATE \
(gst_video_rate_get_type())
#define GST_VIDEO_RATE(obj) \
(G_TYPE_CHECK_INSTANCE_CAST((obj),GST_TYPE_VIDEO_RATE,GstVideoRate))
#define GST_VIDEO_RATE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_CAST((klass),GST_TYPE_VIDEO_RATE,GstVideoRateClass))
#define GST_IS_VIDEO_RATE(obj) \
(G_TYPE_CHECK_INSTANCE_TYPE((obj),GST_TYPE_VIDEO_RATE))
#define GST_IS_VIDEO_RATE_CLASS(klass) \
(G_TYPE_CHECK_CLASS_TYPE((klass),GST_TYPE_VIDEO_RATE))
typedef struct _GstVideoRate GstVideoRate;
typedef struct _GstVideoRateClass GstVideoRateClass;
/**
* GstVideoRate:
*
* Opaque data structure.
*/
struct _GstVideoRate
{
GstBaseTransform parent;
/* video state */
gint from_rate_numerator, from_rate_denominator;
gint to_rate_numerator, to_rate_denominator;
guint64 next_ts; /* Timestamp of next buffer to output */
GstBuffer *prevbuf;
guint64 prev_ts; /* Previous buffer timestamp */
guint64 out_frame_count; /* number of frames output since the beginning
* of the segment or the last frame rate caps
* change, whichever was later */
guint64 base_ts; /* used in next_ts calculation after a
* frame rate caps change */
gboolean discont;
guint64 last_ts; /* Timestamp of last input buffer */
guint64 average_period;
GstClockTimeDiff wanted_diff; /* target average diff */
GstClockTimeDiff average; /* moving average period */
/* segment handling */
GstSegment segment;
/* properties */
guint64 in, out, dup, drop;
gboolean silent;
gdouble new_pref;
gboolean skip_to_first;
gboolean drop_only;
guint64 average_period_set;
volatile int max_rate;
};
struct _GstVideoRateClass
{
GstBaseTransformClass parent_class;
};
GType gst_video_rate_get_type (void);
G_END_DECLS
#endif /* __GST_VIDEO_RATE_H__ */