MSVC has isatty (in io.h), but not unistd.h. (isatty isn't called
at all for windows, since there's a special case block for that.)
Signed-off-by: Martin Storsjö <martin@martin.st>

Tags may contain attached picture, which will be exported as video
streams.

This ensures that the audio stream is always the first.

Right now, it's uint16_t, but for itunes metadata a 32bit number is
stored in it.

Currently if a pattern is given we look for up to the fifth file name in
the sequence. This option sets that limit to an arbitrary number.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

This adds the capability to start counting file number from an arbitrary
integer.

This includes a few lines of trivial code from FFmpeg codebase.
Signed-off-by: Anton Khirnov <anton@khirnov.net>

Also ensure that all such filters get a non-NULL name. Should fix FATE
failures on some architectures after
58b049f2.

Because of a mistake during merging the code for simple and complex
filtergraphs, -async inserts an asyncts filter both on input and output.
Remove the output hunk.

This removes a dependency on implementation details from generic
code and allows easy addition of the equivalent optimisation for
other architectures than x86.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

Inspired by MPlayer's af_channels filter and SoX's remix effect.

It joins multiple input streams into one multi-channel output.

This makes synchronization simpler for filters with multiple inputs.

This breaks libavfilter ABI.

It currently does the following:
1) get a zeroed audio buffer
2) copy some properties (but not the data) of the input buffer to it
3) pass this buffer to the output filter
This looks useless and is indeed not used by any filters, therefore
delete it.

Make ff_null_filter_samples() (just pass the buffer to the next filter)
the new default.

This reduces the dependency on unistd.h which is not available
on all systems.
Signed-off-by: Mans Rullgard <mans@mansr.com>

This function implements a delay using the first available
of the following functions:

- nanosleep()
- usleep()
- Sleep() (Windows)

The conditional #includes in time.c are simplified by including
unistd.h and windows.h whenever they are available rather than
having these lines triggered by specific functions.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

Signed-off-by: Derek Buitenhuis <derek.buitenhuis@gmail.com>

The unistd.h header is only needed for the close() declaration.
If this header is not available, the close() declaration may be
provided by another header, e.g. io.h.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Signed-off-by: Mans Rullgard <mans@mansr.com>

The only symbol this file uses from unistd.h is isatty().  By
including the header only when this function is used, the file
can be built on systems without unistd.h (which presumably also
lack isatty).
Signed-off-by: Mans Rullgard <mans@mansr.com>

This avoids some warnings about redundant declarations.
Signed-off-by: Mans Rullgard <mans@mansr.com>

Add -D_XOPEN_SOURCE=600 to host cflags to make the constants in math.h
available. Include math.h where necessary and remove redundant M_PI
defines.

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Martin Storsjö <martin@martin.st>

Signed-off-by: Mans Rullgard <mans@mansr.com>

It's redundant, since the input buffer is passed as a parameter to the
filter_samples() callback, and can lead to stale pointers remaining on
the link.

It will be used for audio too.

Its documentation states that it is allocated/freed by the caller, but
it is declared as an AV_OPT_TYPE_STRING AVOption. Since
36773283 the AVOptions system frees
strings automatically. This can be considered an API break, since it
won't work when the caller doesn't use av_malloc() to allocate the
memory or wants to use the string after closing the codec.

Since there is not much value in this field being an AVOption, the best
solution is to remove it from the options table.

'channel_layout' not 'channels' from the stored configuration should go
to AVCodecContext's 'channel_layout'.