configure: Suppress "potentially uninitialized variable" warnings from MSVC

The same is done for GCC and clang already.
wavpackenc: fix number of samples per block

Currently, the encoder will try to reduce it down to 150000, but the
decoder will complain starting at 131072 (WV_MAX_SAMPLES). Therefore,
change the loop limit.

Fixes ticket #3881.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
wavpackenc: make assert more thorough

It was only validating that normal data wasn't filling the buffer.
However, extra data may be written afterwards.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
rv34: use ff_mpeg_update_thread_context only when decoder is fully initialized

MpegEncContext based decoders are only fully initialized after the first
ff_thread_get_buffer() call. The RV30/40 decoders may fail before a frame
buffer was requested. ff_mpeg_update_thread_context() fails on half
initialized MpegEncContexts. Since this can only happen before a the
first frame was decoded there is no need to call
ff_mpeg_update_thread_context().

Based on patches by John Stebbins and tested by John Stebbins.

CC: libav-stable@libav.org
electronicarts: do not fail on zero-sized chunks

At least one FATE sample contains such chunks and happens to work simply
by accident (due to find_stream_info() swallowing the error).

CC: libav-stable@libav.org
electronicarts: read the framerate for MAD
electronicarts: set the framerate for TGQ/TQI

It is hardcoded to 15fps.
x86: hevc_mc: assume 2nd source stride is 64

Reviewed-by: Mickaël Raulet <mraulet@gmail.com
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
ogg: Provide aliases for Speex, Opus and audio-only ogg

Since they are aliases for ogg enabling any of them enables ogg as well.
hevc: move MAX_PB_SIZE declaration

Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevcdsp: remove compilation-time-fixed parameter

The dststride parameter is always MAX_PB_SIZE.

Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
hevcdsp: remove more instances of compile-time-fixed parameters

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
x86: hevcdsp: use compilation-time-fixed constant

The stride for some buffers is known.

Reviewed-by: Mickaël Raulet <mraulet@gmail.com>
Signed-off-by: Michael Niedermayer <michaelni@gmx.at>
os_support: Undefine lseek/stat/fstat before defining them

This avoids a number of redefinition warnings on MinGW64.
qt-faststart: Undefine fseeko/ftello before defining them

This avoids a number of redefinition warnings on MinGW64.
Merge commit 'b0bfd09f88da8b7c7666faf0ac7d5e74559dba9f'

* commit 'b0bfd09f88da8b7c7666faf0ac7d5e74559dba9f':
  configure: Suppress "potentially uninitialized variable" warnings from MSVC

Conflicts:
	configure

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit 'dc4b2e7d33903a6b9380e8a84b22b3a20facbb08'

* commit 'dc4b2e7d33903a6b9380e8a84b22b3a20facbb08':
  rv34: use ff_mpeg_update_thread_context only when decoder is fully initialized

Merged-by: Michael Niedermayer <michaelni@gmx.at>
Merge commit '4d6c5152849e23a4cc0f6a6ac2880c01ebcd301b'

* commit '4d6c5152849e23a4cc0f6a6ac2880c01ebcd301b':
  electronicarts: do not fail on zero-sized chunks

Conflicts:
	libavformat/electronicarts.c

Merged-by: Michael Niedermayer <michaelni@gmx.at>
wavpack: check number of channels

This means container and codec disagree. The codec is supposed to
know better so this could be an error instead.
wavpackenc: reset trailer info on block encoding

In some cases, in particular if several blocks are needed because of
the channel layout (e.g. 2.1), the information used to write the
trailing bits terminating the sample data was not reset.

This would cause potential desync on the decoder, although decoded
samples were actually mostly fine.

Fixes ticket #3879.