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6ff8fdfc47
See formula clarifications in design docs for calculation details. https://bugzilla.gnome.org/show_bug.cgi?id=756564
251 lines
12 KiB
C
251 lines
12 KiB
C
/* GStreamer
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* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstsegment.h: Header for GstSegment subsystem
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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_SEGMENT_H__
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#define __GST_SEGMENT_H__
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#include <gst/gstformat.h>
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G_BEGIN_DECLS
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#define GST_TYPE_SEGMENT (gst_segment_get_type())
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typedef struct _GstSegment GstSegment;
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/**
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* GstSeekType:
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* @GST_SEEK_TYPE_NONE: no change in position is required
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* @GST_SEEK_TYPE_SET: absolute position is requested
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* @GST_SEEK_TYPE_END: relative position to duration is requested
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*
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* The different types of seek events. When constructing a seek event with
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* gst_event_new_seek() or when doing gst_segment_do_seek ().
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*/
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typedef enum {
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/* one of these */
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GST_SEEK_TYPE_NONE = 0,
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GST_SEEK_TYPE_SET = 1,
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GST_SEEK_TYPE_END = 2
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} GstSeekType;
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/**
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* GstSeekFlags:
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* @GST_SEEK_FLAG_NONE: no flag
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* @GST_SEEK_FLAG_FLUSH: flush pipeline
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* @GST_SEEK_FLAG_ACCURATE: accurate position is requested, this might
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* be considerably slower for some formats.
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* @GST_SEEK_FLAG_KEY_UNIT: seek to the nearest keyframe. This might be
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* faster but less accurate.
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* @GST_SEEK_FLAG_SEGMENT: perform a segment seek.
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* @GST_SEEK_FLAG_TRICKMODE: when doing fast forward or fast reverse playback, allow
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* elements to skip frames instead of generating all
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* frames. (Since 1.6)
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* @GST_SEEK_FLAG_SNAP_BEFORE: go to a location before the requested position,
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* if %GST_SEEK_FLAG_KEY_UNIT this means the keyframe at or before
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* the requested position the one at or before the seek target.
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* @GST_SEEK_FLAG_SNAP_AFTER: go to a location after the requested position,
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* if %GST_SEEK_FLAG_KEY_UNIT this means the keyframe at of after the
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* requested position.
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* @GST_SEEK_FLAG_SNAP_NEAREST: go to a position near the requested position,
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* if %GST_SEEK_FLAG_KEY_UNIT this means the keyframe closest
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* to the requested position, if both keyframes are at an equal
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* distance, behaves like %GST_SEEK_FLAG_SNAP_BEFORE.
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* @GST_SEEK_FLAG_TRICKMODE_KEY_UNITS: when doing fast forward or fast reverse
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* playback, request that elements only decode keyframes
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* and skip all other content, for formats that have
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* keyframes. (Since 1.6)
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* @GST_SEEK_FLAG_TRICKMODE_NO_AUDIO: when doing fast forward or fast reverse
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* playback, request that audio decoder elements skip
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* decoding and output only gap events or silence. (Since 1.6)
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* @GST_SEEK_FLAG_SKIP: Deprecated backward compatibility flag, replaced
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* by %GST_SEEK_FLAG_TRICKMODE
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*
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* Flags to be used with gst_element_seek() or gst_event_new_seek(). All flags
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* can be used together.
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*
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* A non flushing seek might take some time to perform as the currently
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* playing data in the pipeline will not be cleared.
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*
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* An accurate seek might be slower for formats that don't have any indexes
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* or timestamp markers in the stream. Specifying this flag might require a
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* complete scan of the file in those cases.
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*
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* When performing a segment seek: after the playback of the segment completes,
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* no EOS will be emitted by the element that performed the seek, but a
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* %GST_MESSAGE_SEGMENT_DONE message will be posted on the bus by the element.
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* When this message is posted, it is possible to send a new seek event to
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* continue playback. With this seek method it is possible to perform seamless
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* looping or simple linear editing.
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*
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* When doing fast forward (rate > 1.0) or fast reverse (rate < -1.0) trickmode
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* playback, the %GST_SEEK_FLAG_TRICKMODE flag can be used to instruct decoders
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* and demuxers to adjust the playback rate by skipping frames. This can improve
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* performance and decrease CPU usage because not all frames need to be decoded.
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*
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* Beyond that, the %GST_SEEK_FLAG_TRICKMODE_KEY_UNITS flag can be used to
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* request that decoders skip all frames except key units, and
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* %GST_SEEK_FLAG_TRICKMODE_NO_AUDIO flags can be used to request that audio
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* decoders do no decoding at all, and simple output silence.
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*
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* The %GST_SEEK_FLAG_SNAP_BEFORE flag can be used to snap to the previous
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* relevant location, and the %GST_SEEK_FLAG_SNAP_AFTER flag can be used to
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* select the next relevant location. If %GST_SEEK_FLAG_KEY_UNIT is specified,
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* the relevant location is a keyframe. If both flags are specified, the nearest
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* of these locations will be selected. If none are specified, the implementation is
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* free to select whichever it wants.
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*
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* The before and after here are in running time, so when playing backwards,
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* the next location refers to the one that will played in next, and not the
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* one that is located after in the actual source stream.
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*
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* Also see part-seeking.txt in the GStreamer design documentation for more
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* details on the meaning of these flags and the behaviour expected of
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* elements that handle them.
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*/
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typedef enum {
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GST_SEEK_FLAG_NONE = 0,
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GST_SEEK_FLAG_FLUSH = (1 << 0),
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GST_SEEK_FLAG_ACCURATE = (1 << 1),
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GST_SEEK_FLAG_KEY_UNIT = (1 << 2),
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GST_SEEK_FLAG_SEGMENT = (1 << 3),
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GST_SEEK_FLAG_TRICKMODE = (1 << 4),
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/* FIXME 2.0: Remove _SKIP flag,
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* which was kept for backward compat when _TRICKMODE was added */
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GST_SEEK_FLAG_SKIP = (1 << 4),
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GST_SEEK_FLAG_SNAP_BEFORE = (1 << 5),
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GST_SEEK_FLAG_SNAP_AFTER = (1 << 6),
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GST_SEEK_FLAG_SNAP_NEAREST = GST_SEEK_FLAG_SNAP_BEFORE | GST_SEEK_FLAG_SNAP_AFTER,
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/* Careful to restart next flag with 1<<7 here */
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GST_SEEK_FLAG_TRICKMODE_KEY_UNITS = (1 << 7),
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GST_SEEK_FLAG_TRICKMODE_NO_AUDIO = (1 << 8),
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} GstSeekFlags;
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/**
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* GstSegmentFlags:
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* @GST_SEGMENT_FLAG_NONE: no flags
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* @GST_SEGMENT_FLAG_RESET: reset the pipeline running_time to the segment
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* running_time
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* @GST_SEGMENT_FLAG_TRICKMODE: perform skip playback (Since 1.6)
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* @GST_SEGMENT_FLAG_SEGMENT: send SEGMENT_DONE instead of EOS
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* @GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS: Decode only keyframes, where
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* possible (Since 1.6)
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* @GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO: Do not decode any audio, where
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* possible (Since 1.6)
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* @GST_SEGMENT_FLAG_SKIP: Deprecated backward compatibility flag, replaced
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* by @GST_SEGMENT_FLAG_TRICKMODE
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*
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* Flags for the GstSegment structure. Currently mapped to the corresponding
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* values of the seek flags.
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*/
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/* Note: update gst_segment_do_seek() when adding new flags here */
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typedef enum { /*< flags >*/
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GST_SEGMENT_FLAG_NONE = GST_SEEK_FLAG_NONE,
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GST_SEGMENT_FLAG_RESET = GST_SEEK_FLAG_FLUSH,
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GST_SEGMENT_FLAG_TRICKMODE = GST_SEEK_FLAG_TRICKMODE,
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/* FIXME 2.0: Remove _SKIP flag,
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* which was kept for backward compat when _TRICKMODE was added */
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GST_SEGMENT_FLAG_SKIP = GST_SEEK_FLAG_TRICKMODE,
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GST_SEGMENT_FLAG_SEGMENT = GST_SEEK_FLAG_SEGMENT,
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GST_SEGMENT_FLAG_TRICKMODE_KEY_UNITS = GST_SEEK_FLAG_TRICKMODE_KEY_UNITS,
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GST_SEGMENT_FLAG_TRICKMODE_NO_AUDIO = GST_SEEK_FLAG_TRICKMODE_NO_AUDIO
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} GstSegmentFlags;
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/**
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* GstSegment:
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* @flags: flags for this segment
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* @rate: the playback rate of the segment
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* @applied_rate: the already applied rate to the segment
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* @format: the format of the segment values
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* @base: the running time (plus elapsed time, see offset) of the segment start
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* @offset: the amount (in buffer timestamps) that has already been elapsed in
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* the segment
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* @start: the start of the segment in buffer timestamp time (PTS)
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* @stop: the stop of the segment in buffer timestamp time (PTS)
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* @time: the stream time of the segment start
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* @position: the buffer timestamp position in the segment (used internally by
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* elements such as sources, demuxers or parsers to track progress)
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* @duration: the duration of the segment
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*
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* A helper structure that holds the configured region of
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* interest in a media file.
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*/
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struct _GstSegment {
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/*< public >*/
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GstSegmentFlags flags;
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gdouble rate;
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gdouble applied_rate;
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GstFormat format;
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guint64 base;
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guint64 offset;
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guint64 start;
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guint64 stop;
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guint64 time;
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guint64 position;
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guint64 duration;
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/* < private > */
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gpointer _gst_reserved[GST_PADDING];
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};
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GType gst_segment_get_type (void);
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GstSegment * gst_segment_new (void) G_GNUC_MALLOC;
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GstSegment * gst_segment_copy (const GstSegment *segment) G_GNUC_MALLOC;
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void gst_segment_copy_into (const GstSegment *src, GstSegment *dest);
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void gst_segment_free (GstSegment *segment);
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void gst_segment_init (GstSegment *segment, GstFormat format);
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gint gst_segment_to_stream_time_full (const GstSegment *segment, GstFormat format, guint64 position, guint64 * stream_time);
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guint64 gst_segment_to_stream_time (const GstSegment *segment, GstFormat format, guint64 position);
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gint gst_segment_position_from_stream_time_full (const GstSegment * segment, GstFormat format, guint64 stream_time, guint64 * position);
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guint64 gst_segment_position_from_stream_time (const GstSegment * segment, GstFormat format, guint64 stream_time);
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guint64 gst_segment_to_running_time (const GstSegment *segment, GstFormat format, guint64 position);
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gint gst_segment_to_running_time_full (const GstSegment *segment, GstFormat format, guint64 position,
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guint64 * running_time);
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#ifndef GST_DISABLE_DEPRECATED
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guint64 gst_segment_to_position (const GstSegment *segment, GstFormat format, guint64 running_time);
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#endif
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gint gst_segment_position_from_running_time_full (const GstSegment *segment, GstFormat format, guint64 running_time, guint64 * position);
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guint64 gst_segment_position_from_running_time (const GstSegment *segment, GstFormat format, guint64 running_time);
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gboolean gst_segment_set_running_time (GstSegment *segment, GstFormat format, guint64 running_time);
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gboolean gst_segment_offset_running_time (GstSegment *segment, GstFormat format, gint64 offset);
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gboolean gst_segment_clip (const GstSegment *segment, GstFormat format, guint64 start,
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guint64 stop, guint64 *clip_start, guint64 *clip_stop);
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gboolean gst_segment_do_seek (GstSegment * segment, gdouble rate,
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GstFormat format, GstSeekFlags flags,
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GstSeekType start_type, guint64 start,
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GstSeekType stop_type, guint64 stop, gboolean * update);
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gboolean gst_segment_is_equal (const GstSegment * s0, const GstSegment * s1);
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G_END_DECLS
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#endif /* __GST_SEGMENT_H__ */
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