genode/repos/libports/src/app/qt5/qt_avplay
Norman Feske 4da52517c1 Simpify startup of dynamically linked binaries
This patch removes the component_entry_point library, which used to
proved a hook for the libc to intercept the call of the
'Component::construct' function. The mechansim has several shortcomings
(see the discussion in the associated issue) and was complex. So we
eventually discarded the approach in favor of the explicit handling of
the startup.

A regular Genode component provides a 'Component::construct' function,
which is determined by the dynamic linker via a symbol lookup.
For the time being, the dynamic linker falls back to looking up a 'main'
function if no 'Component::construct' function could be found.

The libc provides an implementation of 'Component::construct', which
sets up the libc's task handling and finally call the function
'Libc::Component::construct' from the context of the appllication task.
This function is expected to be provided by the libc-using application.
Consequently, Genode components that use the libc have to implement the
'Libc::Component::construct' function.

The new 'posix' library provides an implementation of
'Libc::Component::construct' that calls a main function. Hence, POSIX
programs that merely use the POSIX API merely have to add 'posix' to the
'LIBS' declaration in their 'target.mk' file. Their execution starts at
'main'.

Issue #2199
2017-01-13 13:06:52 +01:00
..
avplay_slave.h Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
control_bar.cpp Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
control_bar.h Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
filter_framebuffer_slave.h Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
framebuffer_service_factory.h Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
main_window.cpp qt5_avplay: show the main window earlier 2016-12-23 16:52:08 +01:00
main_window.h Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
main.cpp Simpify startup of dynamically linked binaries 2017-01-13 13:06:52 +01:00
qt_avplay.pro Adapt high-level components to new parent API 2016-11-30 13:37:03 +01:00
README Move repositories to 'repos/' subdirectory 2014-05-14 16:08:00 +02:00
style.qrc Qt5: migrate to new ports mechanism 2014-08-22 16:16:40 +02:00
style.qss Qt5: migrate to new ports mechanism 2014-08-22 16:16:40 +02:00
target.mk Simpify startup of dynamically linked binaries 2017-01-13 13:06:52 +01:00

This directory contains a simple Qt-based media player which is actually a
graphical user interface for the SDL-based 'avplay' media player from 'libav'.
It starts 'avplay' as a child and shows its graphical output in a
'QNitpickerViewWidget'. The widgets for controlling the player state send the
according keyboard and mouse input events to 'avplay'.

The 'qt_avplay' player supports the following configuration options:

:'<mediafile name="..."/>:'
  name of the media file to play

:'<framebuffer_filter name="..." ram_quota="..."/>':

  This node contains the name of a framebuffer filter service to filter the
  video output. It may appear multiple times. If specified more than once, it
  is possible to build a post-processing pipeline for the video display where
  each processing stage is executed by a separate program.