gstreamer/gst/gstsegment.h

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/* GStreamer
* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
*
* gstsegment.h: Header for GstSegment subsystem
*
* 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_SEGMENT_H__
#define __GST_SEGMENT_H__
#include <gst/gstformat.h>
G_BEGIN_DECLS
#define GST_TYPE_SEGMENT (gst_segment_get_type())
typedef struct _GstSegment GstSegment;
/**
* GstSeekType:
* @GST_SEEK_TYPE_NONE: no change in position is required
* @GST_SEEK_TYPE_CUR: change relative to currently configured segment. This
* can't be used to seek relative to the current playback position - do a
* position query, calculate the desired position and then do an absolute
* position seek instead if that's what you want to do.
* @GST_SEEK_TYPE_SET: absolute position is requested
* @GST_SEEK_TYPE_END: relative position to duration is requested
*
* The different types of seek events. When constructing a seek event with
* gst_event_new_seek() or when doing gst_segment_do_seek ().
*/
typedef enum {
/* one of these */
GST_SEEK_TYPE_NONE = 0,
GST_SEEK_TYPE_CUR = 1,
GST_SEEK_TYPE_SET = 2,
GST_SEEK_TYPE_END = 3
} GstSeekType;
/**
* GstSeekFlags:
* @GST_SEEK_FLAG_NONE: no flag
* @GST_SEEK_FLAG_FLUSH: flush pipeline
* @GST_SEEK_FLAG_ACCURATE: accurate position is requested, this might
* be considerably slower for some formats.
* @GST_SEEK_FLAG_KEY_UNIT: seek to the nearest keyframe. This might be
* faster but less accurate.
* @GST_SEEK_FLAG_SEGMENT: perform a segment seek.
* @GST_SEEK_FLAG_SKIP: when doing fast foward or fast reverse playback, allow
* elements to skip frames instead of generating all
* frames. Since 0.10.22.
*
* Flags to be used with gst_element_seek() or gst_event_new_seek(). All flags
* can be used together.
*
* A non flushing seek might take some time to perform as the currently
* playing data in the pipeline will not be cleared.
*
* An accurate seek might be slower for formats that don't have any indexes
* or timestamp markers in the stream. Specifying this flag might require a
* complete scan of the file in those cases.
*
* When performing a segment seek: after the playback of the segment completes,
* no EOS will be emmited by the element that performed the seek, but a
* #GST_MESSAGE_SEGMENT_DONE message will be posted on the bus by the element.
* When this message is posted, it is possible to send a new seek event to
* continue playback. With this seek method it is possible to perform seemless
* looping or simple linear editing.
*
* When doing fast forward (rate > 1.0) or fast reverse (rate < -1.0) trickmode
* playback, the @GST_SEEK_FLAG_SKIP flag can be used to instruct decoders
* and demuxers to adjust the playback rate by skipping frames. This can improve
* performance and decrease CPU usage because not all frames need to be decoded.
*
* Also see part-seeking.txt in the GStreamer design documentation for more
* details on the meaning of these flags and the behaviour expected of
* elements that handle them.
*/
typedef enum {
GST_SEEK_FLAG_NONE = 0,
GST_SEEK_FLAG_FLUSH = (1 << 0),
GST_SEEK_FLAG_ACCURATE = (1 << 1),
GST_SEEK_FLAG_KEY_UNIT = (1 << 2),
GST_SEEK_FLAG_SEGMENT = (1 << 3),
GST_SEEK_FLAG_SKIP = (1 << 4)
} GstSeekFlags;
/**
* GstSegment:
* @flags: flags for this segment
* @rate: the rate of the segment
* @applied_rate: the already applied rate to the segment
* @format: the format of the segment values
* @base: the base time of the segment
* @start: the start of the segment
* @stop: the stop of the segment
* @time: the stream time of the segment
*
* A helper structure that holds the configured region of
* interest in a media file.
*/
struct _GstSegment {
/*< public >*/
GstSeekFlags flags;
gdouble rate;
gdouble applied_rate;
GstFormat format;
guint64 base;
guint64 start;
guint64 stop;
guint64 time;
guint64 position;
guint64 duration;
};
GType gst_segment_get_type (void);
GstSegment * gst_segment_new (void);
GstSegment * gst_segment_copy (const GstSegment *segment);
void gst_segment_copy_into (const GstSegment *src, GstSegment *dest);
void gst_segment_free (GstSegment *segment);
void gst_segment_init (GstSegment *segment, GstFormat format);
guint64 gst_segment_to_stream_time (const GstSegment *segment, GstFormat format, guint64 position);
guint64 gst_segment_to_running_time (const GstSegment *segment, GstFormat format, guint64 position);
guint64 gst_segment_to_position (const GstSegment *segment, GstFormat format, guint64 running_time);
gboolean gst_segment_set_running_time (GstSegment *segment, GstFormat format, guint64 running_time);
gboolean gst_segment_clip (const GstSegment *segment, GstFormat format, guint64 start,
guint64 stop, guint64 *clip_start, guint64 *clip_stop);
gboolean gst_segment_do_seek (GstSegment * segment, gdouble rate,
GstFormat format, GstSeekFlags flags,
GstSeekType start_type, guint64 start,
GstSeekType stop_type, guint64 stop, gboolean * update);
G_END_DECLS
#endif /* __GST_SEGMENT_H__ */