Commit graph

8 commits

Author SHA1 Message Date
Thibault Saunier
ff2180b284 ges: Use #pragma once everywhere 2020-03-19 21:09:18 +00:00
Thibault Saunier
0012c6a3b0 ges: Cleanup the way we declare object types
We create our own _DECLARE_ macro because we have instance structures
2020-03-19 21:09:18 +00:00
Tim-Philipp Müller
4e21628d54 GST_GES_API -> GES_API 2018-03-13 14:14:57 +00:00
Tim-Philipp Müller
3d1c00fbcd ges: GST_EXPORT -> GST_GES_API
We need different export decorators for the different libs.
For now no actual change though, just rename before the release,
and add prelude headers to define the new decorator to GST_EXPORT.
2018-03-13 13:45:35 +00:00
Thibault Saunier
2e9fd0b712 Mark symbols explicitly for export with GST_EXPORT
With two exceptions:
  * ges_clip_create_track_elements_func
  * ges_uri_clip_set_uri

which were never declared in headers and should always have been static.
2017-08-07 15:41:28 -04:00
Tim-Philipp Müller
e40c8fcb30 ges: fix misc g-i annotations 2016-04-30 18:38:33 +01:00
Sjors Gielen
84f7f04a64 Handle changing playback rate
Before this patch, NLE and GES did not support NleOperations (respectively
GESEffects) that changed the speed/tempo/rate at which the source plays. For
example, the 'pitch' element can make audio play faster or slower. In GES 1.5.90
and before, an NleOperation containing the pitch element to change the rate (or
tempo) would cause a pipeline state change to PAUSED after that stack; that has
been fixed in 1.5.91 (see #755012 [0]). But even then, in 1.5.91 and later,
NleComposition would send segment events to its NleSources assuming that one
source second is equal to one pipeline second. The resulting early EOS event
(in the case of a source rate higher than 1.0) would cause it to switch stacks
too early, causing confusion in the timeline and spectacularly messed up
output.

This patch fixes that by searching for rate-changing elements in
GESTrackElements such as GESEffects. If such rate-changing elements are found,
their final effect on the playing rate is stored in the corresponding NleObject
as the 'media duration factor', named like this because the 'media duration',
or source duration, of an NleObject can be computed by multiplying the duration
with the media duration factor of that object and its parents (this is called
the 'recursive media duration factor'). For example, a 4-second NleSource with
an NleOperation with a media duration factor of 2.0 will have an 8-second media
duration, which means that for playing 4 seconds in the pipeline, the seek
event sent to it must span 8 seconds of media. (So, the 'duration' of an
NleObject or GES object always refers to its duration in the timeline, not the
media duration.)

To summarize:

* Rate-changing elements are registered in the GESEffectClass (pitch::tempo and
  pitch::rate are registered by default);
* GESTimelineElement is responsible for detecting rate-changing elements and
  computing the media_duration_factor;
* GESTrackElement is responsible for storing the media_duration_factor in
  NleObject;
* NleComposition is responsible for the recursive_media_duration_factor;
* The latter property finally fixes media time computations in NleObject.

NLE and GES tests are included.

[0] https://bugzilla.gnome.org/show_bug.cgi?id=755012

Differential Revision: https://phabricator.freedesktop.org/D276
2016-02-26 19:54:40 +01:00
Thibault Saunier
e24cccabfd Rename GESTrackParseLaunchEffect to GESEffect 2013-02-15 14:42:05 -03:00