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700 lines
21 KiB
C
700 lines
21 KiB
C
/* GStreamer
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* Copyright (C) 2005 Wim Taymans <wim@fluendo.com>
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*
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* gstsegment.c: 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., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#include "gst_private.h"
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#include <math.h>
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#include "gstutils.h"
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#include "gstsegment.h"
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/**
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* SECTION:gstsegment
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* @short_description: Structure describing the configured region of interest
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* in a media file.
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* @see_also: #GstEvent
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*
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* This helper structure holds the relevant values for tracking the region of
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* interest in a media file, called a segment.
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*
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* The structure can be used for two purposes:
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* <itemizedlist>
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* <listitem><para>performing seeks (handling seek events)</para></listitem>
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* <listitem><para>tracking playback regions (handling newsegment events)</para></listitem>
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* </itemizedlist>
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*
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* The segment is usually configured by the application with a seek event which
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* is propagated upstream and eventually handled by an element that performs the seek.
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*
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* The configured segment is then propagated back downstream with a newsegment event.
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* This information is then used to clip media to the segment boundaries.
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*
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* A segment structure is initialized with gst_segment_init(), which takes a #GstFormat
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* that will be used as the format of the segment values. The segment will be configured
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* with a start value of 0 and a stop/duration of -1, which is undefined. The default
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* rate and applied_rate is 1.0.
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*
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* If the segment is used for managing seeks, the segment duration should be set with
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* gst_segment_set_duration(). The public duration field contains the duration of the
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* segment. When using the segment for seeking, the start and time members should
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* normally be left to their default 0 value. The stop position is left to -1 unless
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* explicitly configured to a different value after a seek event.
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*
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* The current position in the segment should be set with the gst_segment_set_last_stop().
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* The public last_stop field contains the last set stop position in the segment.
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*
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* For elements that perform seeks, the current segment should be updated with the
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* gst_segment_set_seek() and the values from the seek event. This method will update
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* all the segment fields. The last_stop field will contain the new playback position.
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* If the cur_type was different from GST_SEEK_TYPE_NONE, playback continues from
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* the last_stop position, possibly with updated flags or rate.
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*
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* For elements that want to use #GstSegment to track the playback region, use
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* gst_segment_set_newsegment() to update the segment fields with the information from
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* the newsegment event. The gst_segment_clip() method can be used to check and clip
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* the media data to the segment boundaries.
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*
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* For elements that want to synchronize to the pipeline clock, gst_segment_to_running_time()
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* can be used to convert a timestamp to a value that can be used to synchronize
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* to the clock. This function takes into account all accumulated segments as well as
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* any rate or applied_rate conversions.
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*
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* For elements that need to perform operations on media data in stream_time,
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* gst_segment_to_stream_time() can be used to convert a timestamp and the segment
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* info to stream time (which is always between 0 and the duration of the stream).
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*
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* Last reviewed on 2007-05-17 (0.10.13)
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*/
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/**
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* gst_segment_copy:
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* @segment: (transfer none): a #GstSegment
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*
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* Create a copy of given @segment.
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*
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* Free-function: gst_segment_free
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*
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* Returns: (transfer full): a new #GstSegment, free with gst_segment_free().
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*
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* Since: 0.10.20
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*/
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GstSegment *
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gst_segment_copy (const GstSegment * segment)
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{
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GstSegment *result = NULL;
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if (segment) {
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result = (GstSegment *) g_slice_copy (sizeof (GstSegment), segment);
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}
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return result;
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}
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void
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gst_segment_copy_into (const GstSegment * src, GstSegment * dest)
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{
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memcpy (dest, src, sizeof (GstSegment));
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}
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GType
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gst_segment_get_type (void)
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{
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static GType gst_segment_type = 0;
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if (G_UNLIKELY (gst_segment_type == 0)) {
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gst_segment_type = g_boxed_type_register_static ("GstSegment",
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(GBoxedCopyFunc) gst_segment_copy, (GBoxedFreeFunc) gst_segment_free);
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}
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return gst_segment_type;
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}
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/**
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* gst_segment_new:
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*
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* Allocate a new #GstSegment structure and initialize it using
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* gst_segment_init().
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*
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* Free-function: gst_segment_free
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*
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* Returns: (transfer full): a new #GstSegment, free with gst_segment_free().
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*/
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GstSegment *
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gst_segment_new (void)
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{
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GstSegment *result;
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result = g_slice_new0 (GstSegment);
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gst_segment_init (result, GST_FORMAT_UNDEFINED);
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return result;
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}
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/**
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* gst_segment_free:
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* @segment: (in) (transfer full): a #GstSegment
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*
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* Free the allocated segment @segment.
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*/
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void
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gst_segment_free (GstSegment * segment)
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{
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g_slice_free (GstSegment, segment);
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}
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/**
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* gst_segment_init:
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* @segment: a #GstSegment structure.
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* @format: the format of the segment.
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*
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* The start/last_stop positions are set to 0 and the stop/duration
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* fields are set to -1 (unknown). The default rate of 1.0 and no
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* flags are set.
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*
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* Initialize @segment to its default values.
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*/
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void
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gst_segment_init (GstSegment * segment, GstFormat format)
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{
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g_return_if_fail (segment != NULL);
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segment->flags = GST_SEEK_FLAG_NONE;
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segment->rate = 1.0;
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segment->applied_rate = 1.0;
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segment->format = format;
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segment->base = 0;
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segment->start = 0;
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segment->stop = -1;
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segment->time = 0;
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segment->position = 0;
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segment->duration = -1;
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}
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/**
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* gst_segment_do_seek:
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* @segment: a #GstSegment structure.
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* @rate: the rate of the segment.
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* @format: the format of the segment.
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* @flags: the segment flags for the segment
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* @start_type: the seek method
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* @start: the seek start value
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* @stop_type: the seek method
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* @stop: the seek stop value
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* @update: boolean holding whether position was updated.
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*
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* Update the segment structure with the field values of a seek event (see
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* gst_event_new_seek()).
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*
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* After calling this method, the segment field position and time will
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* contain the requested new position in the segment. The new requested
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* position in the segment depends on @rate and @start_type and @stop_type.
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*
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* For positive @rate, the new position in the segment is the new @segment
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* start field when it was updated with a @start_type different from
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* #GST_SEEK_TYPE_NONE. If no update was performed on @segment start position
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* (#GST_SEEK_TYPE_NONE), @start is ignored and @segment position is
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* unmodified.
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*
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* For negative @rate, the new position in the segment is the new @segment
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* stop field when it was updated with a @stop_type different from
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* #GST_SEEK_TYPE_NONE. If no stop was previously configured in the segment, the
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* duration of the segment will be used to update the stop position.
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* If no update was performed on @segment stop position (#GST_SEEK_TYPE_NONE),
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* @stop is ignored and @segment position is unmodified.
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*
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* The applied rate of the segment will be set to 1.0 by default.
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* If the caller can apply a rate change, it should update @segment
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* rate and applied_rate after calling this function.
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*
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* @update will be set to TRUE if a seek should be performed to the segment
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* position field. This field can be FALSE if, for example, only the @rate
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* has been changed but not the playback position.
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*
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* Returns: %TRUE if the seek could be performed.
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*/
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gboolean
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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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{
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gboolean update_stop, update_start;
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guint64 position, base;
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g_return_val_if_fail (rate != 0.0, FALSE);
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g_return_val_if_fail (segment != NULL, FALSE);
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g_return_val_if_fail (segment->format == format, FALSE);
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update_start = update_stop = TRUE;
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position = segment->position;
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if (flags & GST_SEEK_FLAG_FLUSH) {
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/* flush resets the running_time */
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base = 0;
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} else {
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base = gst_segment_to_running_time (segment, format, position);
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}
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/* segment->start is never invalid */
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switch (start_type) {
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case GST_SEEK_TYPE_NONE:
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/* no update to segment, take previous start */
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start = segment->start;
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update_start = FALSE;
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break;
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case GST_SEEK_TYPE_SET:
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/* start holds desired position, map -1 to the start */
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if (start == -1)
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start = 0;
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break;
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case GST_SEEK_TYPE_END:
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if (segment->duration != -1) {
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/* add start to total length */
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start = segment->duration + start;
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} else {
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/* no update if duration unknown */
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start = segment->start;
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update_start = FALSE;
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}
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break;
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}
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/* bring in sane range */
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if (segment->duration != -1)
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start = MIN (start, segment->duration);
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else
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start = MAX (start, 0);
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/* stop can be -1 if we have not configured a stop. */
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switch (stop_type) {
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case GST_SEEK_TYPE_NONE:
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stop = segment->stop;
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update_stop = FALSE;
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break;
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case GST_SEEK_TYPE_SET:
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/* stop holds required value */
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break;
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case GST_SEEK_TYPE_END:
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if (segment->duration != -1) {
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stop = segment->duration + stop;
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} else {
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stop = segment->stop;
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update_stop = FALSE;
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}
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break;
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}
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/* if we have a valid stop time, make sure it is clipped */
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if (stop != -1) {
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if (segment->duration != -1)
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stop = CLAMP (stop, 0, segment->duration);
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else
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stop = MAX (stop, 0);
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}
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/* we can't have stop before start */
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if (stop != -1) {
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if (start > stop) {
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g_return_val_if_fail (start <= stop, FALSE);
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return FALSE;
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}
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}
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segment->rate = rate;
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segment->applied_rate = 1.0;
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segment->base = base;
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segment->flags = (GstSegmentFlags) flags;
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segment->start = start;
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segment->stop = stop;
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segment->time = start;
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if (update_start && rate > 0.0) {
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position = start;
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}
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if (update_stop && rate < 0.0) {
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if (stop != -1)
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position = stop;
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else {
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if (segment->duration != -1)
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position = segment->duration;
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else
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position = 0;
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}
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}
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/* set update arg to reflect update of position */
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if (update)
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*update = position != segment->position;
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/* update new position */
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segment->position = position;
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return TRUE;
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}
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/**
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* gst_segment_to_stream_time:
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* @segment: a #GstSegment structure.
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* @format: the format of the segment.
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* @position: the position in the segment
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*
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* Translate @position to stream time using the currently configured
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* segment. The @position value must be between @segment start and
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* stop value.
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*
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* This function is typically used by elements that need to operate on
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* the stream time of the buffers it receives, such as effect plugins.
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* In those use cases, @position is typically the buffer timestamp or
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* clock time that one wants to convert to the stream time.
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* The stream time is always between 0 and the total duration of the
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* media stream.
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*
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* Returns: the position in stream_time or -1 when an invalid position
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* was given.
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*/
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guint64
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gst_segment_to_stream_time (const GstSegment * segment, GstFormat format,
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guint64 position)
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{
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guint64 result, start, stop, time;
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gdouble abs_applied_rate;
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/* format does not matter for -1 */
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if (G_UNLIKELY (position == -1))
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return -1;
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g_return_val_if_fail (segment != NULL, -1);
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g_return_val_if_fail (segment->format == format, -1);
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/* if we have the position for the same format as the segment, we can compare
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* the start and stop values, otherwise we assume 0 and -1 */
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if (G_LIKELY (segment->format == format)) {
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start = segment->start;
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stop = segment->stop;
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time = segment->time;
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} else {
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start = 0;
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stop = -1;
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time = 0;
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}
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/* outside of the segment boundary stop */
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if (G_UNLIKELY (stop != -1 && position > stop))
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return -1;
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/* before the segment boundary */
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if (G_UNLIKELY (position < start))
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return -1;
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/* time must be known */
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if (G_UNLIKELY (time == -1))
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return -1;
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/* bring to uncorrected position in segment */
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result = position - start;
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abs_applied_rate = ABS (segment->applied_rate);
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/* correct for applied rate if needed */
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if (G_UNLIKELY (abs_applied_rate != 1.0))
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result *= abs_applied_rate;
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/* add or subtract from segment time based on applied rate */
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if (G_LIKELY (segment->applied_rate > 0.0)) {
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/* correct for segment time */
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result += time;
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} else {
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/* correct for segment time, clamp at 0. Streams with a negative
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* applied_rate have timestamps between start and stop, as usual, but have
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* the time member starting high and going backwards. */
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if (G_LIKELY (time > result))
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result = time - result;
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else
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result = 0;
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}
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return result;
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}
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/**
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* gst_segment_to_running_time:
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* @segment: a #GstSegment structure.
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* @format: the format of the segment.
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* @position: the position in the segment
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*
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* Translate @position to the total running time using the currently configured
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* and previously accumulated segments. Position is a value between @segment
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* start and stop time.
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*
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* This function is typically used by elements that need to synchronize to the
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* global clock in a pipeline. The runnning time is a constantly increasing value
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* starting from 0. When gst_segment_init() is called, this value will reset to
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* 0.
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*
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* This function returns -1 if the position is outside of @segment start and stop.
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*
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* Returns: the position as the total running time or -1 when an invalid position
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* was given.
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*/
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guint64
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gst_segment_to_running_time (const GstSegment * segment, GstFormat format,
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guint64 position)
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{
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guint64 result;
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guint64 start, stop, base;
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gdouble abs_rate;
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if (G_UNLIKELY (position == -1))
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return -1;
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g_return_val_if_fail (segment != NULL, -1);
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g_return_val_if_fail (segment->format == format, -1);
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/* if we have the position for the same format as the segment, we can compare
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* the start and stop values, otherwise we assume 0 and -1 */
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if (G_LIKELY (segment->format == format)) {
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start = segment->start;
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stop = segment->stop;
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base = segment->base;
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} else {
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start = 0;
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stop = -1;
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base = 0;
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}
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/* before the segment boundary */
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if (G_UNLIKELY (position < start))
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return -1;
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if (G_LIKELY (segment->rate > 0.0)) {
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/* outside of the segment boundary stop */
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if (G_UNLIKELY (stop != -1 && position > stop))
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return -1;
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/* bring to uncorrected position in segment */
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result = position - start;
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} else {
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/* cannot continue if no stop position set or outside of
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* the segment. */
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if (G_UNLIKELY (stop == -1 || position > stop))
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return -1;
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/* bring to uncorrected position in segment */
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result = stop - position;
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}
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/* scale based on the rate, avoid division by and conversion to
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* float when not needed */
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abs_rate = ABS (segment->rate);
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if (G_UNLIKELY (abs_rate != 1.0))
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result /= abs_rate;
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/* correct for base of the segment */
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result += base;
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return result;
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}
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/**
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* gst_segment_clip:
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* @segment: a #GstSegment structure.
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* @format: the format of the segment.
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* @start: the start position in the segment
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* @stop: the stop position in the segment
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* @clip_start: (out) (allow-none): the clipped start position in the segment
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* @clip_stop: (out) (allow-none): the clipped stop position in the segment
|
|
*
|
|
* Clip the given @start and @stop values to the segment boundaries given
|
|
* in @segment. @start and @stop are compared and clipped to @segment
|
|
* start and stop values.
|
|
*
|
|
* If the function returns FALSE, @start and @stop are known to fall
|
|
* outside of @segment and @clip_start and @clip_stop are not updated.
|
|
*
|
|
* When the function returns TRUE, @clip_start and @clip_stop will be
|
|
* updated. If @clip_start or @clip_stop are different from @start or @stop
|
|
* respectively, the region fell partially in the segment.
|
|
*
|
|
* Note that when @stop is -1, @clip_stop will be set to the end of the
|
|
* segment. Depending on the use case, this may or may not be what you want.
|
|
*
|
|
* Returns: TRUE if the given @start and @stop times fall partially or
|
|
* completely in @segment, FALSE if the values are completely outside
|
|
* of the segment.
|
|
*/
|
|
gboolean
|
|
gst_segment_clip (const GstSegment * segment, GstFormat format, guint64 start,
|
|
guint64 stop, guint64 * clip_start, guint64 * clip_stop)
|
|
{
|
|
g_return_val_if_fail (segment != NULL, FALSE);
|
|
g_return_val_if_fail (segment->format == format, FALSE);
|
|
|
|
/* if we have a stop position and a valid start and start is bigger,
|
|
* we're outside of the segment */
|
|
if (G_UNLIKELY (segment->stop != -1 && start != -1 && start >= segment->stop))
|
|
return FALSE;
|
|
|
|
/* if a stop position is given and is before the segment start,
|
|
* we're outside of the segment. Special case is were start
|
|
* and stop are equal to the segment start. In that case we
|
|
* are inside the segment. */
|
|
if (G_UNLIKELY (stop != -1 && (stop < segment->start || (start != stop
|
|
&& stop == segment->start))))
|
|
return FALSE;
|
|
|
|
if (clip_start) {
|
|
if (start == -1)
|
|
*clip_start = -1;
|
|
else
|
|
*clip_start = MAX (start, segment->start);
|
|
}
|
|
|
|
if (clip_stop) {
|
|
if (stop == -1)
|
|
*clip_stop = segment->stop;
|
|
else if (segment->stop == -1)
|
|
*clip_stop = stop;
|
|
else
|
|
*clip_stop = MIN (stop, segment->stop);
|
|
|
|
if (segment->duration != -1 && *clip_stop != -1)
|
|
*clip_stop = MIN (*clip_stop, segment->duration);
|
|
}
|
|
|
|
return TRUE;
|
|
}
|
|
|
|
/**
|
|
* gst_segment_to_position:
|
|
* @segment: a #GstSegment structure.
|
|
* @format: the format of the segment.
|
|
* @running_time: the running_time in the segment
|
|
*
|
|
* Convert @running_time into a position in the segment so that
|
|
* gst_segment_to_running_time() with that position returns @running_time.
|
|
*
|
|
* Returns: the position in the segment for @running_time. This function returns
|
|
* -1 when @running_time is -1 or when it is not inside @segment.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
guint64
|
|
gst_segment_to_position (const GstSegment * segment, GstFormat format,
|
|
guint64 running_time)
|
|
{
|
|
guint64 result;
|
|
guint64 start, stop, base;
|
|
gdouble abs_rate;
|
|
|
|
if (G_UNLIKELY (running_time == -1))
|
|
return -1;
|
|
|
|
g_return_val_if_fail (segment != NULL, -1);
|
|
g_return_val_if_fail (segment->format == format, FALSE);
|
|
|
|
/* if we have the position for the same format as the segment, we can compare
|
|
* the start and stop values, otherwise we assume 0 and -1 */
|
|
if (G_LIKELY (segment->format == format)) {
|
|
start = segment->start;
|
|
stop = segment->stop;
|
|
base = segment->base;
|
|
} else {
|
|
start = 0;
|
|
stop = -1;
|
|
base = 0;
|
|
}
|
|
|
|
/* this running_time was for a previous segment */
|
|
if (running_time < base)
|
|
return -1;
|
|
|
|
/* start by subtracting the base time */
|
|
result = running_time - base;
|
|
|
|
/* move into the segment at the right rate */
|
|
abs_rate = ABS (segment->rate);
|
|
if (G_UNLIKELY (abs_rate != 1.0))
|
|
result = ceil (result * abs_rate);
|
|
|
|
if (G_LIKELY (segment->rate > 0.0)) {
|
|
/* bring to corrected position in segment */
|
|
result += start;
|
|
|
|
/* outside of the segment boundary stop */
|
|
if (G_UNLIKELY (stop != -1 && result > stop))
|
|
return -1;
|
|
} else {
|
|
/* cannot continue if no stop position set or outside of
|
|
* the segment. */
|
|
if (G_UNLIKELY (stop == -1 || result + start > stop))
|
|
return -1;
|
|
|
|
/* bring to corrected position in segment */
|
|
result = stop - result;
|
|
}
|
|
return result;
|
|
}
|
|
|
|
|
|
/**
|
|
* gst_segment_set_running_time:
|
|
* @segment: a #GstSegment structure.
|
|
* @format: the format of the segment.
|
|
* @running_time: the running_time in the segment
|
|
*
|
|
* Adjust the start/stop and base values of @segment such that the next valid
|
|
* buffer will be one with @running_time.
|
|
*
|
|
* Returns: %TRUE if the segment could be updated successfully. If %FALSE is
|
|
* returned, @running_time is -1 or not in @segment.
|
|
*
|
|
* Since: 0.10.24
|
|
*/
|
|
gboolean
|
|
gst_segment_set_running_time (GstSegment * segment, GstFormat format,
|
|
guint64 running_time)
|
|
{
|
|
guint64 position;
|
|
guint64 start, stop;
|
|
|
|
/* start by bringing the running_time into the segment position */
|
|
position = gst_segment_to_position (segment, format, running_time);
|
|
|
|
/* we must have a valid position now */
|
|
if (G_UNLIKELY (position == -1))
|
|
return FALSE;
|
|
|
|
start = segment->start;
|
|
stop = segment->stop;
|
|
|
|
if (G_LIKELY (segment->rate > 0.0)) {
|
|
/* update the start and time values */
|
|
start = position;
|
|
} else {
|
|
/* reverse, update stop */
|
|
stop = position;
|
|
}
|
|
/* and base time is exactly the running time */
|
|
segment->time = gst_segment_to_stream_time (segment, format, start);
|
|
segment->start = start;
|
|
segment->stop = stop;
|
|
segment->base = running_time;
|
|
|
|
return TRUE;
|
|
}
|