The old implementation, upon receiving a frame on the main
input, would request an overlay frame if necessary. This could
generate an infinite recursion, off-by-one frame mismatch and
other harmful effects, especially it the split filter is present
upgraph.

The new implementation uses the linear approach: it uses two
buffer queues for frames received out of turn and forwards
request_frame calls to the input where a frame is necessary.

This only happens if some filter somewhere is bogus,
but it helps debugging.

fixes use of the amix filter with only 1 input

Signed-off-by: Paul B Mahol <onemda@gmail.com>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

lavfi: Fill linesize, sample_rate and channel_layout fields in avfilter_fill_frame_from_audio_buffer_ref.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fixes part of Ticket1341
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Its needed for fate on shared versioned .so
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fix pixdesctest output with pal8 input.

X-Cola-Count: +(10+i*PI)l

Fix trac ticket #1116.

git blame:
     77 Stefano Sabatini
      1 Michael Niedermayer

Initial commit:
commit 2f83681c
Author: Stefano Sabatini <stefasab@gmail.com>
Date:   Sat Mar 10 14:01:28 2012 +0100

    lavfi: port libmpcodecs remove-logo filter

    The code is based on the remove-logo filter in MPlayer/libmpcodecs, by
    Robert Edele, relicensed to LGPL with consent of the author.

    Address trac issue #249.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame:
    132 Stefano Sabatini
     77 Vitor Sessak
     49 Michael Niedermayer
     24 Anton Khirnov
     22 S.N. Hemanth Meenakshisundaram
     13 Bobby Bingham
      7 Luca Barbato
      2 Nicolas George
      2 Alex Converse
      1 Diego Elio Pettenò

Initial commit not traced as this file was split out.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame:
    423 Nicolas George
     86 Stefano Sabatini
     19 Michael Niedermayer
      1 Reimar Döffinger

Initial commit:
commit bcfd9e82
Author: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date:   Sun Feb 20 23:42:17 2011 +0100

    lavfi: add drawutils
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Only commit:
commit 54c5dd89
Author: Anton Khirnov <anton@khirnov.net>
Date:   Wed May 9 14:08:21 2012 +0200

    lavfi: Add fps filter.

    Partially based on a patch by Robert Nagy <ronag89@gmail.com>

also see [FFmpeg-devel] [PATCH 07/10] vf_fps: fix copyright
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

The original patch was sent with FFmpeg in the license header.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame:
     75 Anton Khirnov
     72 Michael Niedermayer
     39 Stefano Sabatini
     23 S.N. Hemanth Meenakshisundaram
      9 Vitor Sessak
      6 Robert Nagy
      2 Diego Biurrun
      1 Andrey Utkin

Note:
commit ab165047
Author: Anton Khirnov <anton@khirnov.net>
Date:   Fri Apr 27 17:27:40 2012 +0200

    lavfi: add a function for copying properties from AVFilterBufferRef->AVFrame

    Based on a commit by Stefano Sabatini <stefano.sabatini-lala@poste.it>

commit 4a1ac8c4
Author: Anton Khirnov <anton@khirnov.net>
Date:   Thu May 10 07:58:11 2012 +0200

    lavfi: move buffer management function to a separate file.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame:
     45 Stefano Sabatini
     23 Clément Bœsch
      4 Michael Niedermayer
      3 Robert Nagy
      3 Nicolas George
      2 Roger Pau Monné

Initial commit:
commit 566666ca
Author: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date:   Sun May 1 14:47:05 2011 +0200
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame says:
    109 Stefano Sabatini
      7 Clément Bœsch
      2 Reimar Döffinger
      2 Michael Niedermayer
      1 Reinhard Tartler
      1 Mans Rullgard

Initial commit:
commit 1ee410f3
Author: Stefano Sabatini <stefano.sabatini-lala@poste.it>
Date:   Sat Sep 25 01:56:58 2010 +0000

    Add asrc_anullsrc - null audio source.

    Based on a patch by "S.N. Hemanth Meenakshisundaram" smeenaks!ucsd!edu.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

git blame says authors are:
     19 S.N. Hemanth Meenakshisundaram
      2 Reimar Döffinger

initial commit:
	commit f0a55438
	Author: S.N. Hemanth Meenakshisundaram <smeenaks@ucsd.edu>
	Date:   Sat Sep 25 01:57:01 2010 +0000
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Authors according to blame are:
     16 S.N. Hemanth Meenakshisundaram
      4 Stefano Sabatini
      3 Anton Khirnov
      2 Reimar Döffinger

Initial commit was:
	commit 99046339
	Author: S.N. Hemanth Meenakshisundaram <smeenaks@ucsd.edu>
	Date:   Fri Aug 20 23:16:51 2010 +0000
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

Fix -vf copy with pal8 format.

Use the timestamps from the first input.

poll_frame()/request_frame() are used for audio too.

Those functions are only useful inside filters. It is better to not
support user filters until the API is more stable.

Those functions are only useful inside filters. It is better to not
support user filters until the API is more stable.

Link properties have to be checked after config_props() is called to
make sure everything is sane, so the default config_props() for output
links was redundant.

Remove now empty defaults.c
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Fixes an invalid write.

The correct invariant is (cur != NULL -> next != NULL). Not the other way around.
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>