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ffmpeg / libavfilter @ 9a191b3a

# Date Author Comment
30d93310 06/13/2010 09:32 AM Stefano Sabatini

Document what av_get_token() returns in case of allocation failure.

Originally committed as revision 23596 to svn://svn.ffmpeg.org/ffmpeg/trunk

053a79b2 06/13/2010 09:32 AM Stefano Sabatini

Resort @param in av_get_token() doxy to reflect the same order they
have in the function.

Originally committed as revision 23595 to svn://svn.ffmpeg.org/ffmpeg/trunk

5ba949fe 06/13/2010 09:27 AM Stefano Sabatini

Add missing check to av_get_token().

Originally committed as revision 23594 to svn://svn.ffmpeg.org/ffmpeg/trunk

47f0704e 05/23/2010 07:11 PM Stefano Sabatini

Prefix value for flags with "0x", to make it clear that it is an
hexadecimal value.

Originally committed as revision 23262 to svn://svn.ffmpeg.org/ffmpeg/trunk

576fb48e 05/23/2010 08:53 AM Martin Storsjö

Make ff_random_get_seed public, rename to av_get_random_seed, export the header

Keep an old ff_ named function for binary compatibility until the
next major bump.

Originally committed as revision 23254 to svn://svn.ffmpeg.org/ffmpeg/trunk

03c3bb5c 05/16/2010 06:13 PM Baptiste Coudurier

use filter name when graph parser add filters

Originally committed as revision 23147 to svn://svn.ffmpeg.org/ffmpeg/trunk

aeaa9630 05/13/2010 06:26 PM Stefano Sabatini

Remove the name of the file from the @file doxy, it is unnecessary and
inconsistent with the other files.

Originally committed as revision 23122 to svn://svn.ffmpeg.org/ffmpeg/trunk

622e6ce5 05/13/2010 06:26 PM Stefano Sabatini

Make the init and config_filter callbacks of the pad filter return
AVERROR rather than -1 in case of invalid parameters.

Originally committed as revision 23121 to svn://svn.ffmpeg.org/ffmpeg/trunk

dc0eaef3 05/13/2010 06:26 PM Stefano Sabatini

Make av_parse_color() return AVERROR rather than -1.

Originally committed as revision 23120 to svn://svn.ffmpeg.org/ffmpeg/trunk

2c2b2c0a 05/11/2010 05:39 PM Baptiste Coudurier

silence gcc warning about potential uninitialized usage

Originally committed as revision 23093 to svn://svn.ffmpeg.org/ffmpeg/trunk

8ad802e6 05/10/2010 12:28 AM Vitor Sessak

Alloc 16 extra bytes in libavfilter frames. Needed for MMX-optimized swscale.

Fix issue 1924.

Originally committed as revision 23077 to svn://svn.ffmpeg.org/ffmpeg/trunk

b6bc2051 05/09/2010 08:02 PM Stefano Sabatini

Bump lavfi minor after the addition of the fields interlaced and
top_field_first in AVFilterPicRef, done in r23044.

Originally committed as revision 23066 to svn://svn.ffmpeg.org/ffmpeg/trunk

d760a316 05/07/2010 10:12 PM Stefano Sabatini

Make config_props() show conversion information before to create the
swscale context.

This makes eventual warnings issued in case of swscale context
creation failure to be shown after the conversion information rather
than before, which is slightly less confusing....

38efdb2c 05/07/2010 10:12 PM Stefano Sabatini

Log input size, input format and swscale flags used for conversion in
config_props().

Useful for debugging.

Originally committed as revision 23055 to svn://svn.ffmpeg.org/ffmpeg/trunk

f66b3905 05/07/2010 05:53 PM Måns Rullgård

vf_pad: fix mixed code and declarations

Originally committed as revision 23054 to svn://svn.ffmpeg.org/ffmpeg/trunk

a0aa7354 05/07/2010 01:00 PM Michael Niedermayer

c99 sucks. Replacing scanf("%i") by strtoul()

Originally committed as revision 23053 to svn://svn.ffmpeg.org/ffmpeg/trunk

3c940173 05/07/2010 11:47 AM Michael Niedermayer

Add pad filter.

Originally committed as revision 23046 to svn://svn.ffmpeg.org/ffmpeg/trunk

efdc74ef 05/07/2010 10:02 AM Michael Niedermayer

Try to keep track of interlaced and top field first.

Originally committed as revision 23044 to svn://svn.ffmpeg.org/ffmpeg/trunk

3b9900c1 05/07/2010 09:22 AM Michael Niedermayer

Enable vsrc_buffer

Originally committed as revision 23042 to svn://svn.ffmpeg.org/ffmpeg/trunk

8155bbc9 05/07/2010 09:20 AM Michael Niedermayer

Support setting flags for sws.

Originally committed as revision 23041 to svn://svn.ffmpeg.org/ffmpeg/trunk

cf13f204 05/07/2010 01:25 AM Michael Niedermayer

Add "Memory buffer source filter" from SOC.
This is needed by the current SOC-ffmpeg.c code.

Originally committed as revision 23039 to svn://svn.ffmpeg.org/ffmpeg/trunk

2308b6c1 04/28/2010 08:00 PM Michael Niedermayer

Add version to AVClass so we can add to and use fields of AVClass without ABI issues.

Originally committed as revision 22987 to svn://svn.ffmpeg.org/ffmpeg/trunk

ba87f080 04/20/2010 02:45 PM Diego Biurrun

Remove explicit filename from Doxygen @file commands.

Passing an explicit filename to this command is only necessary if the
documentation in the @file block refers to a file different from the
one the block resides in.

Originally committed as revision 22921 to svn://svn.ffmpeg.org/ffmpeg/trunk

3748b2b8 04/18/2010 08:10 PM Stefano Sabatini

Fix leak in avfilter_graph_add_filter().

In case of reallocation failure the pointer to the original filter
array was lost. The correct behavior seems to just keep the old array
and count.

Originally committed as revision 22905 to svn://svn.ffmpeg.org/ffmpeg/trunk

22b7b23c 04/13/2010 11:22 PM Stefano Sabatini

Make avfilter_graph_add_filter() returns AVERROR in case of
failed reallocation, rather than just -1.

Originally committed as revision 22878 to svn://svn.ffmpeg.org/ffmpeg/trunk

bc3c85a3 04/11/2010 09:26 PM Stefano Sabatini

Apply grammar/consistency nits to avfilter_graph_add_filter() doxy.

Originally committed as revision 22842 to svn://svn.ffmpeg.org/ffmpeg/trunk

ac1c9564 04/10/2010 08:34 PM Bobby Bingham

Bump libavfilter minor version and Changelog for unsharp filter

Originally committed as revision 22830 to svn://svn.ffmpeg.org/ffmpeg/trunk

e0728d79 04/07/2010 01:05 AM Bobby Bingham

Add unsharp video filter.
Contributed by Daniel G. Taylor (dan/at/programmer-art/dot/org)

Originally committed as revision 22813 to svn://svn.ffmpeg.org/ffmpeg/trunk

2bb96256 04/03/2010 03:29 PM Bobby Bingham

Remove variable whose value was never read. Found by clang.

Originally committed as revision 22794 to svn://svn.ffmpeg.org/ffmpeg/trunk

72415b2a 03/30/2010 11:30 PM Stefano Sabatini

Define AVMediaType enum, and use it instead of enum CodecType, which
is deprecated and will be dropped at the next major bump.

Originally committed as revision 22735 to svn://svn.ffmpeg.org/ffmpeg/trunk

15ba015f 03/18/2010 11:13 PM Bobby Bingham

The vflip filter does not need to keep ownership of a picture reference.
Avoid creating and releasing useless extra picture references in the
start_frame and end_frame callbacks.

Originally committed as revision 22596 to svn://svn.ffmpeg.org/ffmpeg/trunk

d313e17a 03/18/2010 11:13 PM Bobby Bingham

Use the new null callbacks to simplify filters and reduce duplicated code.

Originally committed as revision 22595 to svn://svn.ffmpeg.org/ffmpeg/trunk

91d1c741 03/18/2010 11:12 PM Bobby Bingham

Create a set of null callback functions.
These are useful for filters which don't modify the image data.

Originally committed as revision 22594 to svn://svn.ffmpeg.org/ffmpeg/trunk

e88c9dac 03/17/2010 04:37 AM Bobby Bingham

Cosmetics: vertical align

Originally committed as revision 22578 to svn://svn.ffmpeg.org/ffmpeg/trunk

c0bc2fed 03/17/2010 04:37 AM Bobby Bingham

Allow format and noformat filters to be more completely disabled when the
other is enabled.

Originally committed as revision 22577 to svn://svn.ffmpeg.org/ffmpeg/trunk

55fd1bbc 03/17/2010 04:37 AM Bobby Bingham

Cosmetics: rearrange functions to simplify ifdeffery

Originally committed as revision 22576 to svn://svn.ffmpeg.org/ffmpeg/trunk

3922deb5 03/17/2010 03:43 AM Bobby Bingham

Add video filter to manipulate aspect ratio

Originally committed as revision 22573 to svn://svn.ffmpeg.org/ffmpeg/trunk

89fb9ae9 03/13/2010 12:33 PM Stefano Sabatini

Make the scale filter pass the pkt.pos information to the output
picref.

Originally committed as revision 22509 to svn://svn.ffmpeg.org/ffmpeg/trunk

8955a324 03/13/2010 11:41 AM Stefano Sabatini

Bump libavfilter minor version and add APIchanges entry after the
addition of the AVFilterPicRef.pos field.

Originally committed as revision 22508 to svn://svn.ffmpeg.org/ffmpeg/trunk

5bb5c1dc 03/13/2010 11:27 AM Stefano Sabatini

Add AVFilterPicRef.pos field and make libavfilter propagate stream
byte position information, as stored in the pkt.pos, through the
filterchain.

Note that the pos field is added non at the end of the
AVFilterPicRef struct, thus breaking ABI compatibility, which is...

ec7ab610 03/13/2010 10:41 AM Stefano Sabatini

Extend the slice filter to make it issue slice height values randomly
choosen between 8 and 32 when the supplied parameter is the string
"random".

This is useful for testing the slice support, but it is not supposed
to be used for other purposes and this interface may change in the...

1250fcc8 03/08/2010 03:41 AM Måns Rullgård

avfilter: make avfilter_default_free_video_buffer() static

This function is not referenced outside this file and has no
prototype. Feel free to flame if this is wrong.

Originally committed as revision 22314 to svn://svn.ffmpeg.org/ffmpeg/trunk

3b2142af 03/07/2010 11:53 PM Stefano Sabatini

Make avfilter_default_start_frame() correctly pass the aspect ratio
information to the next filter.

Originally committed as revision 22300 to svn://svn.ffmpeg.org/ffmpeg/trunk

63833766 03/06/2010 09:28 PM Stefano Sabatini

Show aspect ratio information in dprintf_picref() traces.

Originally committed as revision 22255 to svn://svn.ffmpeg.org/ffmpeg/trunk

11ab237e 02/25/2010 07:55 PM Stefano Sabatini

Add the graph2dot tools and document it.

Also link avfiltergraph.o and graphparser.o against libavfilter, as it
uses them.

Originally committed as revision 22063 to svn://svn.ffmpeg.org/ffmpeg/trunk

ef9f8dd7 02/03/2010 11:10 PM Stefano Sabatini

Use pixel format descriptors for checking if the input format is
paletted. Simpler and more robust.

Originally committed as revision 21631 to svn://svn.ffmpeg.org/ffmpeg/trunk

d2a2b08c 02/01/2010 07:50 PM Stefano Sabatini

Use pixel format descriptors to check if the input format is paletted.

Originally committed as revision 21597 to svn://svn.ffmpeg.org/ffmpeg/trunk

b4b66456 01/31/2010 04:33 PM Stefano Sabatini

Avoid usage of avcodec_get_pix_fmt_name() and
avcodec_get_chroma_sub_sample(), directly access
av_pix_fmt_descriptors instead.

Remove some of the dependancies of lavfi on lavc.

Originally committed as revision 21575 to svn://svn.ffmpeg.org/ffmpeg/trunk

718c7b18 01/30/2010 07:10 PM Stefano Sabatini

Use av_get_pix_fmt() instead of the deprecated avcodec_get_pix_fmt()
function.

Originally committed as revision 21550 to svn://svn.ffmpeg.org/ffmpeg/trunk

006aa1a4 01/16/2010 11:05 AM Stefano Sabatini

Implement null video sink.

Originally committed as revision 21242 to svn://svn.ffmpeg.org/ffmpeg/trunk

dd08b83c 01/16/2010 10:43 AM Stefano Sabatini

Implement null video source.

Originally committed as revision 21240 to svn://svn.ffmpeg.org/ffmpeg/trunk

b5eab66e 01/16/2010 10:10 AM Stefano Sabatini

Make avfilter_default_start_frame() request a buffer with the same
size of the output link of the destination filter, rather than of the
size of the input link.
In particular this fixes a crash in the rotate filter.

Originally committed as revision 21238 to svn://svn.ffmpeg.org/ffmpeg/trunk

a482e61b 01/16/2010 04:49 AM Måns Rullgård

Add symbol versioning for shared libraries

Based on patch by Reinhard Tartler <siretart tauware de>

Originally committed as revision 21236 to svn://svn.ffmpeg.org/ffmpeg/trunk

08f8b51f 01/13/2010 12:16 AM Stefano Sabatini

Make avfilter_insert_filter() log the names of the filters between
which it inserts the new filter.

Originally committed as revision 21177 to svn://svn.ffmpeg.org/ffmpeg/trunk

f37c934d 01/13/2010 12:09 AM Stefano Sabatini

Make query_formats() print an error message if an auto-inserted scale
filter cannot convert between input and output formats.

Originally committed as revision 21176 to svn://svn.ffmpeg.org/ffmpeg/trunk

9ea97721 01/10/2010 02:23 PM Stefano Sabatini

Make query_formats() increment the scaler_count after each scaler
insertion.

Originally committed as revision 21124 to svn://svn.ffmpeg.org/ffmpeg/trunk

999c23a1 01/10/2010 01:45 PM Stefano Sabatini

Make avfilter_insert_filter() print the instance name of the
auto-inserted scale filter, rather than the filter name, as this
provides more information.

Originally committed as revision 21123 to svn://svn.ffmpeg.org/ffmpeg/trunk

3fb8e77a 01/10/2010 01:39 PM Stefano Sabatini

Add a log context to avfilter_graph_config_links().

Originally committed as revision 21121 to svn://svn.ffmpeg.org/ffmpeg/trunk

27d8f6b6 01/08/2010 11:48 PM Stefano Sabatini

Make the scale filter set in the input and output links only the
respective pixel formats effectively supported by libswscale.

Originally committed as revision 21105 to svn://svn.ffmpeg.org/ffmpeg/trunk

d3c01751 01/08/2010 08:19 AM Stefano Sabatini

Fix compilation on gcc 2.95.3 (still supported) broken by r21077,
which was due to declaring variable after code.

Originally committed as revision 21086 to svn://svn.ffmpeg.org/ffmpeg/trunk

063e7692 01/07/2010 10:59 PM Stefano Sabatini

Make avfilter_formats_unref(AVFilterFormats **ref) handle the case
when *ref is NULL.

Originally committed as revision 21077 to svn://svn.ffmpeg.org/ffmpeg/trunk

fe592585 01/07/2010 10:52 PM Stefano Sabatini

Use the @return doxy command, and extend documentation for the return
value of AVFilter.query_formats.

Originally committed as revision 21076 to svn://svn.ffmpeg.org/ffmpeg/trunk

c4d2e41c 01/07/2010 10:51 PM Stefano Sabatini

Avoid the use of the modal auxiliary "should" in the
AVFilter.query_formats doxy.
The doxy expresses what a function does, not what it should do.

Originally committed as revision 21075 to svn://svn.ffmpeg.org/ffmpeg/trunk

516841ef 01/07/2010 10:44 PM Stefano Sabatini

Fix doxy, use third person.

Originally committed as revision 21073 to svn://svn.ffmpeg.org/ffmpeg/trunk

c1d662fd 01/06/2010 04:19 PM Stefano Sabatini

Change avfilter_add_colorspace() to make it accept **avff rather than
*avff, so that an AVFilterFormats struct is created and returned by
the function if *avff is NULL.

Make the function use more convenient.

Originally committed as revision 21035 to svn://svn.ffmpeg.org/ffmpeg/trunk

5ff84183 01/04/2010 12:08 AM Stefano Sabatini

Make avfilter_all_colorspaces() add to the returned list of pixel
formats only the non-HW-accelerated formats, for which there is no
sense in filtering.

Originally committed as revision 21009 to svn://svn.ffmpeg.org/ffmpeg/trunk

4fd1f187 01/03/2010 10:26 PM Stefano Sabatini

Implement avfilter_add_colorspace().

Originally committed as revision 21007 to svn://svn.ffmpeg.org/ffmpeg/trunk

41600690 01/03/2010 02:31 PM Stefano Sabatini

Prefer "*FUNC_NAME(" over "* FUNC_NAME(" for XXX_configuration() and
XXX_license() functions, consistent with the rest of FFmpeg.

Originally committed as revision 21005 to svn://svn.ffmpeg.org/ffmpeg/trunk

15a316c0 12/11/2009 08:02 PM Stefano Sabatini

Make parse_filter() parsing more robust.

Add ';' and '\n' to the terminating characters for the name of a
filter, and ';' to the terminating characters for its args.

Originally committed as revision 20800 to svn://svn.ffmpeg.org/ffmpeg/trunk

62096b99 12/08/2009 10:01 PM Stefano Sabatini

Make parse_key_value_pair() print an error message if a key is not
found in the context.

Originally committed as revision 20779 to svn://svn.ffmpeg.org/ffmpeg/trunk

7d132c54 12/08/2009 10:00 PM Stefano Sabatini

Use an unsigned int to contain all the color values of the expressions
of the type 0xRRGBBAA parsed by av_parse_color(), using a simple int
was resulting in unexpected results as the most significant bit was
used for the sign.

Originally committed as revision 20778 to svn://svn.ffmpeg.org/ffmpeg/trunk

e87eb039 12/08/2009 05:08 PM Stefano Sabatini

Fix alpha plane flipping for the yuva420p and similar pixel formats.

Originally committed as revision 20771 to svn://svn.ffmpeg.org/ffmpeg/trunk

3a1acfd7 12/06/2009 05:41 PM Stefano Sabatini

Reindent after the last commit.

Originally committed as revision 20755 to svn://svn.ffmpeg.org/ffmpeg/trunk

bf972d5e 12/06/2009 05:40 PM Stefano Sabatini

Fix slicify when the slice_direction is negative, make it send slices
from the bottom to the top one.

Originally committed as revision 20754 to svn://svn.ffmpeg.org/ffmpeg/trunk

a13a5437 12/04/2009 11:26 PM Stefano Sabatini

Add a slice_dir parameter to avfilter_draw_slice().

Avoid the need to implement slice direction detection code, thus
reducing code duplication.

See the thread:
"[FFmpeg-devel] [PATCH] Add a slice_dir parameter to avfilter_start_frame()".

Originally committed as revision 20734 to svn://svn.ffmpeg.org/ffmpeg/trunk

b37aa4de 11/29/2009 06:02 PM Stefano Sabatini

Use the correct chroma values for the data[] array used in
draw_slice().

The chroma values to use are supposed to be those of the input format,
not that of the output format, the latter case was causing crashes and
chroma issues.

Originally committed as revision 20660 to svn://svn.ffmpeg.org/ffmpeg/trunk

8aeb3322 11/29/2009 05:40 PM Stefano Sabatini

Use a valid log context for av_log().

Originally committed as revision 20659 to svn://svn.ffmpeg.org/ffmpeg/trunk

bd283738 11/29/2009 10:42 AM Stefano Sabatini

Document slice ordering assumption required by avfilter_draw_slice().

The assumption depends on the corresponding assumption done by
sws_scale() and by the scale filter.

Originally committed as revision 20655 to svn://svn.ffmpeg.org/ffmpeg/trunk

4cc3f6af 11/25/2009 11:24 PM Stefano Sabatini

Remove AVFilter.next field, since it is not used and it is not going
to be used since the implementation of the new filter registration
system.

Originally committed as revision 20611 to svn://svn.ffmpeg.org/ffmpeg/trunk

1433c4ab 11/24/2009 11:58 PM Stefano Sabatini

Implement avfilter_next().

Originally committed as revision 20607 to svn://svn.ffmpeg.org/ffmpeg/trunk

86a60fa1 11/24/2009 11:47 PM Stefano Sabatini

Implement a new registration system for filters.

Create a new static array containing pointers to the AVFilter
definitions, so that the non-constant next filter in the AVFilter
struct is not anymore required and the AVFilter definitions may be
stored in shareable memory....

2d64744f 11/22/2009 11:51 AM Stefano Sabatini

Remove from the list of the supported formats the formats which are
not correctly supported.

See the thread:
"[FFmpeg-devel] [PATCH] Remove not truly supported formats support from the crop filter".

Originally committed as revision 20576 to svn://svn.ffmpeg.org/ffmpeg/trunk

c1736936 11/18/2009 05:15 PM Diego Biurrun

Add functions to return library license and library configuration.

Originally committed as revision 20547 to svn://svn.ffmpeg.org/ffmpeg/trunk

1f20782c 11/16/2009 06:39 PM Diego Biurrun

Add missing #includes for avutil.h, required for the AV_VERSION* macros.

Originally committed as revision 20544 to svn://svn.ffmpeg.org/ffmpeg/trunk

c3eabb7d 11/11/2009 11:50 PM Stefano Sabatini

Add scale filter.

Originally committed as revision 20519 to svn://svn.ffmpeg.org/ffmpeg/trunk

5c3c0e3f 11/09/2009 09:00 PM Stefano Sabatini

Fix crop filter start_frame() for paletted formats different from
PAL8. Shift data1 only if the input format is not paletted.

Originally committed as revision 20488 to svn://svn.ffmpeg.org/ffmpeg/trunk

dd18b301 11/09/2009 06:56 PM Stefano Sabatini

Enable linking of parseutils.o.

Originally committed as revision 20487 to svn://svn.ffmpeg.org/ffmpeg/trunk

ac74dfa4 11/08/2009 10:47 PM Stefano Sabatini

Fix start_frame(), which was issuing chroma artifacts with planar
formats with more than 8 bits per pixel (e.g. YUVXXXP16).

Originally committed as revision 20479 to svn://svn.ffmpeg.org/ffmpeg/trunk

cabc41b0 11/03/2009 10:47 PM Stefano Sabatini

Vertical align.

Originally committed as revision 20447 to svn://svn.ffmpeg.org/ffmpeg/trunk

198d5653 11/03/2009 10:46 PM Stefano Sabatini

Use spaces after commas for improving readability.

Originally committed as revision 20446 to svn://svn.ffmpeg.org/ffmpeg/trunk

bc37ec92 11/03/2009 10:41 PM Stefano Sabatini

Add slicify video filter.

Originally committed as revision 20445 to svn://svn.ffmpeg.org/ffmpeg/trunk

da23d424 11/03/2009 10:15 PM Stefano Sabatini

Make avfilter_get_video_buffer() use
avfilter_default_get_video_buffer() if the get_video_buffer() callback
is not defined in a filter.

Libavfilter filters author have to explicitely define the
get_video_buffer() callback if they want the buffer to be requested to...

ae2abc69 11/03/2009 10:04 PM Stefano Sabatini

Explicitely define get_video_buffer() callbacks in the format,
noformat and null filters.

Originally committed as revision 20443 to svn://svn.ffmpeg.org/ffmpeg/trunk

dc264e77 11/03/2009 09:59 PM Stefano Sabatini

Change file doxy from
"video format and noformat filters" to
"format and noformat video filters",
as suggested by Diego.

Originally committed as revision 20442 to svn://svn.ffmpeg.org/ffmpeg/trunk

09da1781 11/03/2009 09:57 PM Stefano Sabatini

Fix/clarify description of the noformat filter.

Originally committed as revision 20441 to svn://svn.ffmpeg.org/ffmpeg/trunk

c5ec0d9d 10/30/2009 11:11 AM Stefano Sabatini

Remove the get_video_buffer() callback.

That was never required since avfilter_get_video_buffer() already
calls itself on the next link if get_video_buffer is not defined.

Originally committed as revision 20419 to svn://svn.ffmpeg.org/ffmpeg/trunk

2be414c8 10/27/2009 10:12 PM Stefano Sabatini

Fix doxies, use third person and phrase-ending dots.

Originally committed as revision 20391 to svn://svn.ffmpeg.org/ffmpeg/trunk

fcbed3c7 10/27/2009 09:40 PM Stefano Sabatini

Add format and noformat filters.

Originally committed as revision 20390 to svn://svn.ffmpeg.org/ffmpeg/trunk

3555d2e8 10/27/2009 07:52 PM Stefano Sabatini

Introduce first_avfilter and use that, together with AVFilter.next,
for registering and finding filters, rather than use the struct
AVFilterList, which is removed.

Simplify the filter registration management code.

Originally committed as revision 20387 to svn://svn.ffmpeg.org/ffmpeg/trunk

243110f9 10/27/2009 07:42 PM Stefano Sabatini

Add a field 'next' to AVFilter.

Simplify the registration and iteration of all the registered filters,
consistent with what is done with formats / codecs.

Originally committed as revision 20385 to svn://svn.ffmpeg.org/ffmpeg/trunk