This is to assist with hardware implementations that upload a
texture with a different size than the size of the video.

See https://bugzilla.gnome.org/show_bug.cgi?id=727886#c22

This is to assist with hardware upload implementations that
also perform color conversion during the upload and therefore
the resulting format is different than the original buffer format.

See https://bugzilla.gnome.org/show_bug.cgi?id=727886

Fixes warning "Sticky event misordering, got 'segment' before 'caps'".

Thanks slomo for pointing out it's not standard.

matching_attr can not be NULL here, we've tested that away a few
lines beforehand.

Coverity 1139655

This avoids using uninitialized data (and properly rejects caps).

Coverity 1139898

It was already checked in an early out, and as it's only
incremented for at most the size of the passed buffer, it
can only become NULL in an address wraparound.

While there, don't cast away const on a pointer.

Coverity 1139845

This fixes a possible NULL dereference.

Coverity 1195146

If it does, the pad may be leaked if it's a request pad, though.

Coverity 1139799

Coverity 1139798

Coverity 1195140, 1195139, 1195138

If gst_video_overlay_rectangle_apply_global_alpha is called with
a rectangle with unsuitable alpha, expanding the alpha plane will
fail, and thus lead to dereferencing a NULL src pointer. It's not
certain this will happen in practice, as the function is static
and callers might ensure suitable alpha before calling, but there
is no apparent explicit such check.
Add prologue asserts for proper alpha to explicitely prevent this.

Coverity 1139707

Coverity 1139589, 1139588

Wasn't playing nice with an if statement below.

Coverity 1139767

An audio CD may contain about a tenth of the samples 32 bit can
represent, so it doesn't seem likely this will be hit in practice.

Coverity 1139805

Assume systemstream=false for video/mpeg caps where that field
is missing.

At 48 kHz, 2<<31 samples is reached before 13 hours so it
sounds plausible this would be hit.

Coverity 1139800, 1139801

Also rejects negative timestamps that aren't GST_CLOCK_TIME_NONE.

Coverity 1139797

This should not cause any actual bug since Theora and Daala have
a maximum shift of 31, and a packet duration of 2^31 seems very
implausible. But it fixes:

Coverity 1139804, 1139803, 1139802

And add NULLness asserts at top of function. The only call
to this passes local variable pointers, so non NULL.

Coverity 206375

It should really not happen unless the tag list it corrupt,
but the API returns a failure code so we may as well use it.

Coverity 1139595

Coverity 1197695

decodebin: In adaptive streaming mode, only have a fixed buffer limit for the non-buffering multiqueue

Checking the size available was incorrect, and the infos
for per-pad EOS are available.

Same logic as audiomixer.

fixes: https://bugzilla.gnome.org/show_bug.cgi?id=727025

Also parse channels as an optional field in the caps for compressed
audio formats.

Check all supported caps on the overlay video pad, not just the
first of (possibly) many.

Videodecoder does late renegotiation, it will wait for the next
buffer before renegotiating its caps and bufferpool. It might happen
that downstream element switched from passthrough to non-passthrough
and sent a reconfigure upstream (that caused this renegotiation).
This downstream element will ask the video sink below for the bufferpool
with an allocation query and will get the same bufferpool that
videodecoder is holding, too.

When renegotiating, if videodecoder deactivates its bufferpool it
might be deactivating the bufferpool that some element downstream
is using and cause the pipeline to fail.

https://bugzilla.gnome.org/show_bug.cgi?id=727498

Clock slaving can clip start time to zero, giving us a shorted
duration than we originally got. To keep in sync, we must then
discard the samples falling before that zero timestamp.

This possibly fixes random distortion caused by constant PA
underflows which are never resynced.

The KEMAC payload actually needs to have subpayloads and the key should
go into the KEY_DATA subpayload. Add support for subpayloads and
implement the KEY_DATA payload.
Add some pointers to the conversion functions that allow us to add
encryption and decryption later.

Drop the reference instead of waiting for either finalize(), or
for a new source when reused. Everyone else already forgot about
the old source.

Added gst_rtsp_watch_set_flushing to list in file
libgstrtsp.def

baseparse will reverse each GOP for us already, so the segment events can
be after our keyframe. Make sure to get it and all other relevant sticky
events before starting to decode.