commit a2f478ca0b2bda8db9b321f0cfa9e9d3cf6130f9
author Eric Laurent <elaurent@google.com> Tue Apr 10 19:09:40 2018 -0700
committer Eric Laurent <elaurent@google.com> Wed Apr 11 19:07:45 2018 -0700
tree 00e39e41acac99cc35c292c65c7bca60973fdd5a
parent 9fc25229e0723c93b453ab34957f22a643e2b602

audioflinger: implement silenced capture for mmap

Implement silencing of audio capture for idle UIDs for
MMAP streams.

Use audio HAL setMicGain() API to silence the mmap buffer for
exclusive mode and when only one client is active in shared mode.

Add new MmapStreamCallback method onStreamSilenced() for AAudio
service to selectively silence streams from silenced UIDs in
shared mode.

Bug: 72134552
Test: manual
Change-Id: I7c92ba0002bc5ba003c1a3c887edddf9ae53b538

services/audioflinger/MmapTracks.h

diff --git a/services/audioflinger/MmapTracks.h b/services/audioflinger/MmapTracks.h
index a210a1b..6f546c3 100644
--- a/services/audioflinger/MmapTracks.h
+++ b/services/audioflinger/MmapTracks.h
@@ -43,6 +43,15 @@
      static void        appendDumpHeader(String8& result);
             void        appendDump(String8& result, bool active);
 
+                        // protected by MMapThread::mLock
+            void        setSilenced_l(bool silenced) { mSilenced = silenced;
+                                                       mSilencedNotified = false;}
+                        // protected by MMapThread::mLock
+            bool        isSilenced_l() const { return mSilenced; }
+                        // protected by MMapThread::mLock
+            bool        getAndSetSilencedNotified_l() { bool silencedNotified = mSilencedNotified;
+                                                        mSilencedNotified = true;
+                                                        return silencedNotified; }
 private:
     friend class MmapThread;
 
@@ -58,5 +67,7 @@
     virtual void onTimestamp(const ExtendedTimestamp &timestamp);
 
     pid_t mPid;
+    bool  mSilenced;            // protected by MMapThread::mLock
+    bool  mSilencedNotified;    // protected by MMapThread::mLock
 };  // end of Track