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    • Sjors Gielen's avatar
      Handle changing playback rate · 84f7f04a
      Sjors Gielen authored and Thibault Saunier's avatar Thibault Saunier committed 
      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
      84f7f04a
  29. 09 Feb, 2016 1 commit
  31. 05 Feb, 2016 1 commit
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    • Thibault Saunier's avatar
      ges: Enhance xges format versioning · 241e809a
      Thibault Saunier authored 
      Summary:
Handle the fact that some new features can be added and that means
generated files will not be fully understandable by older versions of
the formatter.

Make sure that we set the format version to 0.2 when we serialize the
GstEncodingProfile.enabled property.

Add some tests around that.

+ Fix a minor bug in the test-utils
+ Add a meta on the projects to tell in what format version a project
  has been serialized/parsed back

API:
  GES_META_FORMAT_VERSION

Depends on D178

Reviewers: Mathieu_Du

Differential Revision: http://phabricator.freedesktop.org/D184
      241e809a
  57. 09 Apr, 2015 1 commit
  59. 08 Apr, 2015 1 commit
  61. 25 Mar, 2015 1 commit
  63. 18 Mar, 2015 1 commit
    • Thibault Saunier's avatar
      ges: Move the notion of children properties to GESTimelineElement · 42477a5e
      Thibault Saunier authored 
      Summary:
Deprecate the old GESTrackElement children property handling API.

New APIs:
  * ges_timeline_element_list_children_properties
  * ges_timeline_element_lookup_child
  * ges_timeline_element_get_child_property_by_pspec
  * ges_timeline_element_get_child_property_valist
  * ges_timeline_element_get_child_properties
  * ges_timeline_element_set_child_property_valist
  * ges_timeline_element_set_child_property_by_pspec
  * ges_timeline_element_set_child_properties
  * ges_timeline_element_set_child_property
  * ges_timeline_element_get_child_property
  * ges_timeline_element_add_child_property
  * ges_timeline_element_remove_child_property

Deprecated APIs:
  * ges_track_element_list_children_properties
  * ges_track_element_lookup_child
  * ges_track_element_get_child_property_by_pspec
  * ges_track_element_get_child_property_valist
  * ges_track_element_get_child_properties
  * ges_track_element_set_child_property_valist
  * ges_track_element_set_child_property_by_pspec
  * ges_track_element_set_child_properties
  * ges_track_element_set_child_property
  * ges_track_element_get_child_property
  * ges_track_element_add_child_property

Reviewers: Mathieu_Du

Differential Revision: http://phabricator.freedesktop.org/D40
      42477a5e