From 575a5361fc970476cd7979638ee3ac00cc6e5024 Mon Sep 17 00:00:00 2001
From: Andreas Huber <andih@google.com>
Date: Wed, 3 Oct 2012 10:16:58 -0700
Subject: Better power savings with wifi display code.

No more polling the encoder for work to do, the encoder instead notifies
if there's activity.

Change-Id: Ia707211b4f5c5a6e6b70d750233d204a2d6bb778
related-to-bug: 7248248
---
 include/media/stagefright/MediaCodec.h | 42 +++++++++++++++++++++-------------
 1 file changed, 26 insertions(+), 16 deletions(-)

(limited to 'include')

diff --git a/include/media/stagefright/MediaCodec.h b/include/media/stagefright/MediaCodec.h
index 8c612d4..cacfa54 100644
--- a/include/media/stagefright/MediaCodec.h
+++ b/include/media/stagefright/MediaCodec.h
@@ -108,6 +108,11 @@ struct MediaCodec : public AHandler {
 
     status_t requestIDRFrame();
 
+    // Notification will be posted once there "is something to do", i.e.
+    // an input/output buffer has become available, a format change is
+    // pending, an error is pending.
+    void requestActivityNotification(const sp<AMessage> &notify);
+
 protected:
     virtual ~MediaCodec();
     virtual void onMessageReceived(const sp<AMessage> &msg);
@@ -132,22 +137,23 @@ private:
     };
 
     enum {
-        kWhatInit                       = 'init',
-        kWhatConfigure                  = 'conf',
-        kWhatStart                      = 'strt',
-        kWhatStop                       = 'stop',
-        kWhatRelease                    = 'rele',
-        kWhatDequeueInputBuffer         = 'deqI',
-        kWhatQueueInputBuffer           = 'queI',
-        kWhatDequeueOutputBuffer        = 'deqO',
-        kWhatReleaseOutputBuffer        = 'relO',
-        kWhatGetBuffers                 = 'getB',
-        kWhatFlush                      = 'flus',
-        kWhatGetOutputFormat            = 'getO',
-        kWhatDequeueInputTimedOut       = 'dITO',
-        kWhatDequeueOutputTimedOut      = 'dOTO',
-        kWhatCodecNotify                = 'codc',
-        kWhatRequestIDRFrame            = 'ridr',
+        kWhatInit                           = 'init',
+        kWhatConfigure                      = 'conf',
+        kWhatStart                          = 'strt',
+        kWhatStop                           = 'stop',
+        kWhatRelease                        = 'rele',
+        kWhatDequeueInputBuffer             = 'deqI',
+        kWhatQueueInputBuffer               = 'queI',
+        kWhatDequeueOutputBuffer            = 'deqO',
+        kWhatReleaseOutputBuffer            = 'relO',
+        kWhatGetBuffers                     = 'getB',
+        kWhatFlush                          = 'flus',
+        kWhatGetOutputFormat                = 'getO',
+        kWhatDequeueInputTimedOut           = 'dITO',
+        kWhatDequeueOutputTimedOut          = 'dOTO',
+        kWhatCodecNotify                    = 'codc',
+        kWhatRequestIDRFrame                = 'ridr',
+        kWhatRequestActivityNotification    = 'racN',
     };
 
     enum {
@@ -191,6 +197,8 @@ private:
 
     List<sp<ABuffer> > mCSD;
 
+    sp<AMessage> mActivityNotify;
+
     MediaCodec(const sp<ALooper> &looper);
 
     static status_t PostAndAwaitResponse(
@@ -216,6 +224,8 @@ private:
     status_t setNativeWindow(
             const sp<SurfaceTextureClient> &surfaceTextureClient);
 
+    void postActivityNotificationIfPossible();
+
     DISALLOW_EVIL_CONSTRUCTORS(MediaCodec);
 };
 
-- 
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