This has two benefits:
 - allow zero copy in audio decoders,
 - allow negotiation of the output formats (potentially for S/PDIF).

This makes the android vout work on Android 4.3.

This API is available since Android 2.3/Gingerbread (api level 9).
It's a public, official API, contrary to the earlier hacking by
accessing the internal C++ Surface class directly. In most cases,
the ANativeWindow API is a very thin wrapper doing pretty much
the same as the existing Surface class entry points we've been using.

In Android 4.3, the C++ Surface class lock function we've been using
was renamed again, but using the new corresponding function as
we've done before doesn't work any longer.

Therefore, use the public API where possible (loading it dynamically,
to not break compatibility with pre-2.3 devices).

The only non-public API used in the vout is now the YV12
pixel format, which doesn't work on all devices.
Signed-off-by: Martin Storsjö <martin@martin.st>

Fixes #8760

The ALSA channels maps only indicate the order(s) of channels supported
by the audio adapter. They do not imply that all channels are actually
physically wired.

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

The original code was non-working because the notication was never
setup correctly and resulted in a DSERR_INVALIDCALL. A proper fix
would look like:

         if( sys->p_notify )
         {
+            IDirectSoundBuffer_Stop( aout->sys->p_dsbuffer );
             DSBPOSITIONNOTIFY notif = {.dwOffset = aout->sys->i_write, .hEventNotify = sys->hnotify_evt } ;
             if( IDirectSoundNotify_SetNotificationPositions( sys->p_notify, 1, &notif ) ==  DS_OK )
             {
+                IDirectSoundBuffer_Play( aout->sys->p_dsbuffer, 0, 0, DSBPLAY_LOOPING );
                 WaitForSingleObject( sys->hnotify_evt, INFINITE );
                 IDirectSoundBuffer_Stop( aout->sys->p_dsbuffer );
             }

But fixing it makes the problem worse since the notification is setup
too late and thus the buffer will replay a full loop of the back
buffer during a drain.
Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

Signed-off-by: Jean-Baptiste Kempf <jb@videolan.org>

With the reference counting stuff, the AVFrame structure is gone or
unreachable by the time the release function is called.

This will simplify later commits.

This can happen in some corner cases such as flushing (luckily the leak
would automatically be resolved when the device instance is released).

This reenables direct rendering with libavcodec in most cases.

Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>

Functions are provided to:

 * query the available equalizer presets
 * create a new default equalizer instance
 * create an equalizer instance from a preset
 * set individual equalizer band amplitudes
 * set equalizer pre-amplification
 * apply an equalizer to a media player

Equalizer settings can be applied whether media is playing or not,
and will automatically be retained when playing media subsequently.
Signed-off-by: Rémi Denis-Courmont <remi@remlab.net>