/* GStreamer * Copyright (C) 2005 Wim Taymans * * 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., 51 Franklin St, Fifth Floor, * Boston, MA 02110-1301, USA. */ #ifndef __GST_SEGMENT_H__ #define __GST_SEGMENT_H__ #include 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_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_SET = 1, GST_SEEK_TYPE_END = 2 } 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. * @GST_SEEK_FLAG_SNAP_BEFORE: go to a location before the requested position, * if KEY_UNIT this means the keyframe at or before the * requested position the one at or before the seek target. * @GST_SEEK_FLAG_SNAP_AFTER: go to a location after the requested position, * if KEY_UNIT this means the keyframe at of after the * requested position. * @GST_SEEK_FLAG_SNAP_NEAREST: go to a position near the requested position, * if KEY_UNIT this means the keyframe closest to the * requested position, if both keyframes are at an equal * distance, behaves like SNAP_BEFORE. * * 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 seamless * 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. * * The @GST_SEEK_FLAG_SNAP_BEFORE flag can be used to snap to the previous * relevant location, and the @GST_SEEK_FLAG_SNAP_AFTER flag can be used to * select the next relevant location. If KEY_UNIT is specified, the relevant * location is a keyframe. If both flags are specified, the nearest of these * locations will be selected. If none are specified, the implementation is * free to select whichever it wants. * The before and after here are in running time, so when playing backwards, * the next location refers to the one that will played in next, and not the * one that is located after in the actual source stream. * * 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), GST_SEEK_FLAG_SNAP_BEFORE = (1 << 5), GST_SEEK_FLAG_SNAP_AFTER = (1 << 6), GST_SEEK_FLAG_SNAP_NEAREST = GST_SEEK_FLAG_SNAP_BEFORE | GST_SEEK_FLAG_SNAP_AFTER, /* Careful to restart next flag with 1<<7 here */ } GstSeekFlags; /** * GstSegmentFlags: * @GST_SEGMENT_FLAG_NONE: no flags * @GST_SEGMENT_FLAG_RESET: reset the pipeline running_time to the segment * running_time * @GST_SEGMENT_FLAG_SKIP: perform skip playback * @GST_SEGMENT_FLAG_SEGMENT: send SEGMENT_DONE instead of EOS * * Flags for the GstSegment structure. Currently mapped to the corresponding * values of the seek flags. */ /* Note: update gst_segment_do_seek() when adding new flags here */ typedef enum { /*< flags >*/ GST_SEGMENT_FLAG_NONE = GST_SEEK_FLAG_NONE, GST_SEGMENT_FLAG_RESET = GST_SEEK_FLAG_FLUSH, GST_SEGMENT_FLAG_SKIP = GST_SEEK_FLAG_SKIP, GST_SEGMENT_FLAG_SEGMENT = GST_SEEK_FLAG_SEGMENT } GstSegmentFlags; /** * 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 of the segment * @offset: the offset to apply to @start or @stop * @start: the start of the segment * @stop: the stop of the segment * @time: the stream time of the segment * @position: the position in the segment * @duration: the duration of the segment * * A helper structure that holds the configured region of * interest in a media file. */ struct _GstSegment { /*< public >*/ GstSegmentFlags flags; gdouble rate; gdouble applied_rate; GstFormat format; guint64 base; guint64 offset; guint64 start; guint64 stop; guint64 time; guint64 position; guint64 duration; /* < private > */ gpointer _gst_reserved[GST_PADDING]; }; GType gst_segment_get_type (void); GstSegment * gst_segment_new (void) G_GNUC_MALLOC; GstSegment * gst_segment_copy (const GstSegment *segment) G_GNUC_MALLOC; 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_offset_running_time (GstSegment *segment, GstFormat format, gint64 offset); 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__ */