Commit graph

172 commits

Author SHA1 Message Date
Wim Taymans
855b6877e9 Fixed autoplugging.
Original commit message from CVS:
Fixed autoplugging.
2000-12-05 18:08:59 +00:00
Erik Walthinsen
04c360e39f Changed the way things are scheduled, especially sources. A Src used to have a push() function, and optionally a pus...
Original commit message from CVS:
Changed the way things are scheduled, especially sources.  A Src used to
have a push() function, and optionally a pushregion() to deal with async
reads, etc.  That whole thing has gone away, in favor of providing a
pull() function for the output (Src) pad instead, ala chain functions.
This makes constructing cothreaded schedules out of non-loop elements
somewhat easier.  Basically there was always a question as to which pad
was being dealt with.  In the pullregion case, cothread-specific data was
used to try to pass the region struct to the right place, which is a slow
hack.  And in general, the push function severely limited the kind of
tricks that could be played when there's more than one output pad, such as
a multi-out file reader with async capabilities on each pad independently.

This changes the way cothread scheduling occurs.  Instead of the hack to
deal with Src's by calling their push() function (or optionally the
pushregion(), in certain cases), we now are working towards a general
mechanism where pads are the only thing that are dealt with directly.

An optimization was made in the process of doing this: the loopfunction
actually run as the outer [stack] frame of the cothread is now set more
intelligently in create_plan() based on what kind of element it is.  We
now have:

loopfunc_wrapper: used for loop-based elements, it simply calls the
loopfunc in a loop, paying attention to COTHREAD_STOPPING (see
below).  It currently does other, soon to be depracated, stuff.

pullsrc_wrapper: wraps a Src that's not loop-based (since your options
are now loop- or pull-based)

There will be a couple more to deal with other cases, such as Connections
and chain-based elements.  The general idea is that it's a lot more
efficient to make the decisions once in create_plan than to keep doing
this huge if/else chain in the wrapper.  Just choose the right wrapper up
front.  It'll be most apparent performance-wise in the case of whichever
element context is switched to first for each iteration, since the whole
wrapper setup is done for every iteration.

The tricky part is that there is now a bit of overloading of the function
pointers in a pad.  The current meanings (possibly to change a bit more
soon) are:

chainfunc: as always, chainfunc pointer is mirrored between peer pads
(this may change, and the chain func may end up in pushfunc)
pushfunc: SrcPad: gst_pad_pushfunc_proxy, cothread_switch to peer
SinkPad: none (may take over chainfunc, see below) pullfunc:
SrcPad: Src or Connection's function to construct buffers
SinkPad: gst_pad_pullfunc_proxy, cothread_switch to peer

There are a number of issues remaining with the scheduling, not the least
of which is the fact that Connections are still dealt with the old way,
with _push() functions and such.  I'm trying to figure out a way to unify
the system so it makes sense.  Following the scheduling system is hard
enough, trying to change it is murder.


Another useful scheduling addition, mentioned above, is COTHREAD_STOPPING.
It's an element flag that's used to signal whatever code is running in
cothread context that it should be finishing up and exiting soon.  An
example of this is in plugins/cobin/spindentity.c.  All the loops should
now be composed of do/while loops, rather than while(1) loops:

do {
buf = gst_pad_pull(spindentity->sinkpad);
gst_pad_push(spindentity->srcpad,buf);
} while (!GST_ELEMENT_IS_COTHREAD_STOPPING(element));

The reason for this is that COTHREAD_STOPPING may be set before the above
loop ever gets started.  It wouldn't do for the body of the loop to never
once get called, that would simply stall the pipeline. Note that only the
core library code is ever responsible for setting and unsetting this flag.
All elements have to do is respond to it by cleanly exiting the loop and
the function holding it.

This is needed primarily to allow iterations to occur properly.
Basically, there's a single entry point in the cothread scheduling loop,
gst_bin_iterate_func() simply switches to this cothread.  If the element
in this context is allowed to loop infinitely, nothing would even switch
back to the context from which the iterate() was originally called.  This
is a bit of a problem.  The solution is for there to be an implicit switch
back to the originating context.  Now, even I'm not sure exactly how this
works, but if the cothread that's switched to actually returns, execution
returns back to the calling context, i.e. iterate_func().

COTHREAD_STOPPING is therefore set just before switching into this
(currently randomly chosen) context, on the assumption that it will return
promptly after finishing its duties.  The burden of clearing the flag
falls to the various wrapper functions provided by the Bin code, thus
element writers don't have to worry about doing that at all (and simply
shouldn't).


Related changes:
All the sources in elements/ have been changed to reflect the new system.


FIXMEs:
1) gstpipeline.c calls gst_src_push at some point, dunno why, it's
commented out now.
2) any other sources, including vcdsrc, dvdsrc, and v4lsrc will break
badly and need to be modified to work as pull-based sources.
2000-12-04 10:52:30 +00:00
Wim Taymans
4f55ae4ded Added multiple types to the pads.
Original commit message from CVS:
Added multiple types to the pads.
Added first preview of the capabilities system.
Autoplugging is seriously broken with these (and other) changes.
2000-12-03 17:51:29 +00:00
Wim Taymans
26a69ef7f8 Code Cleanups
Original commit message from CVS:
Code Cleanups
Added use cases for the source elements.
2000-11-25 14:18:47 +00:00
Wim Taymans
2521a319c3 MPEG2 types added for better autoplugging. MPEG2 works more or less. fix in autoplugging. avi now works.
Original commit message from CVS:
MPEG2 types added for better autoplugging. MPEG2 works more or less.
fix in autoplugging. avi now works.
2000-10-21 12:04:40 +00:00
Wim Taymans
b7810a3635 Removed the hardcoded pipeline setup is gstplay in favor of the autoplugging features. Still in a rought shape...
Original commit message from CVS:
Removed the hardcoded pipeline setup is gstplay in favor of the
autoplugging features. Still in a rought shape...
2000-10-12 19:41:30 +00:00
Wim Taymans
870c6045b2 Fixed a severe timestamp bug in mpeg_play.
Original commit message from CVS:
Fixed a severe timestamp bug in mpeg_play.
Create a new thread upon a multisrc element in autoplugging: the autoplug
example now correctly sets up 5 threads for an mpeg player.
2000-10-09 20:01:17 +00:00
Wim Taymans
695f761c2b Fixed a bug in the typeloading.
Original commit message from CVS:
Fixed a bug in the typeloading.
Fixes to various elements so that correct types are returned.
Fixed flag collision with GtkObject.
Elements can now suggest a thread. not sure if this is the right way to
handle automatic thread creation.
Autoplugging now works with multiple sinks and thread setup. No threads
are created for intermediate elements yet, so MPEG may still be choppy.
2000-10-08 22:17:11 +00:00
Wim Taymans
31d31ddc2a Cleanups.
Original commit message from CVS:
Cleanups.
The first steps to a Glade like XML handling.
A first example of what is to come...
2000-09-24 22:45:48 +00:00
Wim Taymans
e5ab7f33ac A first attempt to fix the queues in a cothreaded pipeline.
Original commit message from CVS:
A first attempt to fix the queues in a cothreaded pipeline.
Some fixes to the thread handling.
Fix a bug in gstreamer-config : gthread was not included.
gst_bin_create_plan() is now done in the READY state.
a bin with only another bin in it will now work with gst_bin_iterate.
Added some examples for the queues.
2000-09-22 23:35:14 +00:00
Wim Taymans
cab1728fa5 Added gst_pipeline_add_sink/src to allow multiple sink cases and more complex autoplugging. Update docs too.
Original commit message from CVS:
Added gst_pipeline_add_sink/src to allow multiple sink cases and
more complex autoplugging. Update docs too.
Simplified the pipeline autoplugging code.
Changed the cothread case: One iteration is now a push from the src
element. The disk source does not change its state anymore on eof.
Better type setting for the ac3 parser/decoder and mpeg2parse.
2000-09-17 22:08:09 +00:00
Wim Taymans
8051d54c36 Due to popular demand :-), I added a vorbis decoder.
Original commit message from CVS:
Due to popular demand :-), I added a vorbis decoder.
The encoder is not yet functional.
Small cosmetic changes to gstcpu.c

Beware:
You *need* to install libvorbis.a from the main vorbis CVS.
you *have* to change the line in libtool to
deplibs_check_method="pass_all"
because else the plugin shared library refuses to link against the
static libvorbis.a library. This is a hack. I have no intention in
including libvorbis into the gstreamer CVS tree and making it
libtool compatible.
2000-09-14 20:31:03 +00:00
Wim Taymans
552b7f32aa Changes to gstreamer-config to include gtk+ libs manual changes: queues, threads, programs gsteditor does not crash a...
Original commit message from CVS:
Changes to gstreamer-config to include gtk+ libs
manual changes: queues, threads, programs
gsteditor does not crash anymore.
gstpipline new should return a GstElement *
fixed ac3dec for new getbits
fixes to gstreamer-launch
more efficient startup for gstplay.
2000-09-09 16:36:10 +00:00
Wim Taymans
a703c01d94 More docs (most of them just empty...)
Original commit message from CVS:
More docs (most of them just empty...)
Added automatic pad plugging.
Added automatic dynamic pad plugging.
Changed some codecs to correctly set their pad types.
2000-08-22 21:18:18 +00:00
Wim Taymans
fa4a4319f0 A first (rude) attempt at autoplug.
Original commit message from CVS:
A first (rude) attempt at autoplug.
Autoplugging selects appropriate codecs to connect src to sink, adds
them to the pipeline and connect pads.
Autoplugging will run the typedetect plugin if the src pad has no MIME
type.
No autoplugging is done on the src and sink pads, it's hardcoded:
connect 'src to sink'.
No attempt at creating threads.
No attempt at dynamically autoplugging not yet existing pads.
Changes to (some) plugins to properly set their MIME types.
2000-08-21 21:20:38 +00:00
Wim Taymans
6661696de0 Various fixes for the build/install problems update to the docs/manual. Added a simple helloworld example.
Original commit message from CVS:
Various fixes for the build/install problems
update to the docs/manual. Added a simple helloworld example.
2000-08-18 20:35:48 +00:00
Wim Taymans
202ba2ae4a State change fixes in the threading element.
Original commit message from CVS:
State change fixes in the threading element.
Added bufferpools.
2000-08-14 10:55:35 +00:00
Erik Walthinsen
b6d31c1c72 Megapatch, changes which states are available, how they're used, and how they're set. Also modifies the scheduling s...
Original commit message from CVS:
Megapatch, changes which states are available, how they're used, and how
they're set.  Also modifies the scheduling system, breaking pulled
buffers.  Check mail archives for more details.
2000-07-17 17:14:15 +00:00
Wim Taymans
9920b88c3f This is the audio/video sync release.
Original commit message from CVS:
This is the audio/video sync release.
Changed the mpegvideoparser to parse complete pictures. Added the PTS
timestamps to the pictures.
Added PTS timestamps to the MPEG audio frames.
Made the clock a littlebit better.
Gstplay now uses two more threads one for video, one for audio playback.
Added the first QoS callbacks for the pads.
hopefully fix an mmx compilation problem.
2000-07-12 22:52:42 +00:00
Wim Taymans
ef63c32778 This is a rather large patch. Switched on -Wall compiler flag and fixed the warnings.
Original commit message from CVS:
This is a rather large patch. Switched on -Wall compiler flag and fixed
the warnings.
Made the Video for Linux more like it should be.
2000-02-27 23:18:38 +00:00
Erik Walthinsen
65e7c2e158 More documentation changes, a couple configure.in and Makefile.am fixes.
Original commit message from CVS:
More documentation changes, a couple configure.in and Makefile.am fixes.
2000-02-02 06:26:44 +00:00
Erik Walthinsen
1762dfbf98 initial checkin
Original commit message from CVS:
initial checkin
2000-01-30 09:03:00 +00:00