Commits on Jun 25, 2020

1. API: Allow caching for output ports …

   This commit reverts 3d97601 ("More documentation in jack.h") partly.
   
   The following call stack is used:
   jack_port_get_buffer()
   JackGraphManager::GetBuffer(jack_port_id_t, jack_nframes_t)
   JackGraphManager::GetBuffer(jack_port_id_t)
   JackPort::GetBuffer()
   
   To call JackGraphManager::GetBuffer(jack_port_id_t, jack_nframes_t)
   the object JackLibGlobals::fGlobals->fGraphManage is used. It is only
   set in JackLibClient::Open(). Therefore it is not changed in the life
   time of a JACK client.
   
   In case port->fTied will be modified at runtime the returned audio
   buffer would change. This variable can only be modified by the
   deprecated jack_port_tie() function. Therefore as long as not calling
   this deprecated function the audio buffer would not change.
   
   The previous analyses is only valid for JACK audio output ports
   (JackPortIsOutput). The creating JACK client can write to those
   ports. For JACK audio input ports (JackPortIsInput) it is still not
   allowed to cache the audio buffer address because for those ports the
   returned audio buffer is depending on the port connections
   (pipelining). The decision for the pipelining is done in
   JackGraphManager::GetBuffer(jack_port_id_t, jack_nframes_t).
   
   Change-Id: Ief1cd18d018d5e407876630c22254d87f3c55442
   Signed-off-by: Timo Wischer <twischer@de.adit-jv.com>

   Timo Wischer committed Jun 25, 2020
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