Based on patch by Matthew Waters

Add private data
Add decide_allocation vmethod
Refactor bufferpool negotiation

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=681719

From a942293 to 2de221c

https://bugzilla.gnome.org/show_bug.cgi?id=692613

The root cause is that alsa-lib is not thread safe for the same handle.
There are two threads in the gstreamer accessing alsa-lib not serilized.
The race condition happens when one thread holds the old framebuffer app_ptr
position in the kernel, another thread advances the framebuffer app_ptr.
when the former thread is scheduled to run again, it overwrites the app_ptr
to old value by copying from kernel.Thus,the app_ptr in the upper
alsa-lib(pcm_rate) become one period size more advanced than the lower
alsa-lib(pcm_hw & kernel).

gstreamer uses noblock and poll method to communicate with the alsa-lib.
The app_ptr unsync situation as described above makes the poll return immediately because
it concludes there is enough space for the ring-buffer via the low-level alsa-lib.
The write function returns immediately because it concludes there is not enough
space for the ring-buffer from the upper-level alsa-lib. Then the loop of poll
and write runs again and again until another period size is available for
ring-buffer.This leads to the cpu 100 problem.

delay_lock  is used to avoid the race condition.

Fixes: https://bugzilla.gnome.org/show_bug.cgi?id=690937

Use stream-id as sort criterion in addition to the media type.

https://bugzilla.gnome.org/show_bug.cgi?id=634407

The _1_0 suffixed environment variables override the
non-suffixed ones, so if we're in an environment that
sets the _1_0 suffixed ones, such as jhbuild, we need
to set those to make sure ours actually always get
used.

https://bugzilla.gnome.org/show_bug.cgi?id=690582

From a72faea to a942293

These override the variants without version suffix. Makes
'make check' work properly in environments that set the
suffixed variant for 1.0, such as jhbuild.

jhbuild already sets $GST_PLUGIN_PATH_1_0 which overrides $GST_PLUGIN_PATH. Set
both for the tests to see the locally built elements. Fixes 'make check' in
jhbuild.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=690591

The image type is not in the info structure in the sample,
not in the caps.

https://bugzilla.gnome.org/show_bug.cgi?id=691687

A return value of FALSE here indicates that we don't have control-values. In
0.10 we were returning the default value of the property. Now we don't fill an
array with defaults in the ControlBinding, but leave it up to the element to
handle this case.

Positive granulepos is valid, -1 granulepos is unset, and all
other negative granulepos are invalid.

Reported by Tim-Philipp Müller

https://bugzilla.gnome.org/show_bug.cgi?id=675761

https://bugzilla.gnome.org/show_bug.cgi?id=675761

https://bugzilla.gnome.org/show_bug.cgi?id=667317

https://bugzilla.gnome.org/show_bug.cgi?id=636753

API: gst_encoding_profile_get_file_extension()

https://bugzilla.gnome.org/show_bug.cgi?id=636753

Remove some macros that aren't needed any more.

https://bugzilla.gnome.org/show_bug.cgi?id=687817

to avoid the state change function from messing with the state of the elements
that we add.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=690420

Add the channel masks for all the extensible formats
Pass the number of channels instead of reading them from caps.

fixes #690591

We need to mark our clock as using some other clock source. Alsa source uses the
clock type to decide if it can use alsa driver timestamps or not.

Fixes https://bugzilla.gnome.org/show_bug.cgi?id=690465

We need to initialize this variable because we can't be sure that the subclass
will set it.

comparison is always true due to limited range of data type

Otherwise baseaudiosrc won't go into the error code path.

https://bugzilla.gnome.org/show_bug.cgi?id=690197

Use new ringbuffer ERROR state to make all the various
threads bail out correctly when the subclass posts an
error. It's a bit iffy to communicate this properly
between the different bits of code.

https://bugzilla.gnome.org/show_bug.cgi?id=690197

API: GST_AUDIO_RING_BUFFER_STATE_ERROR

https://bugzilla.gnome.org/show_bug.cgi?id=690197

The naming is not perfect, but at least we can keep the exact same behaviour as
before.