video: Add support to push blank buffers on surface switch

Add support to push blank buffers only on surface switch.
Setting "push-blank-buffers-on-switch" key with value 1
will enable this feature.

Change-Id: I4a0fc48fe24c09a6b8d0e2e0fc4dc2e96d3178bf

2 files changed, 9 insertions, 1 deletions

diff --git a/include/media/stagefright/ACodec.h b/include/media/stagefright/ACodec.h
index cbc2ba6..0ac13b9 100644
--- a/include/media/stagefright/ACodec.h
+++ b/include/media/stagefright/ACodec.h
@@ -148,6 +148,7 @@ protected:
         kFlagIsSecure                                 = 1,
         kFlagPushBlankBuffersToNativeWindowOnShutdown = 2,
         kFlagIsGrallocUsageProtected                  = 4,
+        kFlagPushBlankBuffersToNativeWindowOnSwitch = 1 << 7,
     };
 
     enum {
diff --git a/media/libstagefright/ACodec.cpp b/media/libstagefright/ACodec.cpp
index 7351d3e..8cf38ef 100644
--- a/media/libstagefright/ACodec.cpp
+++ b/media/libstagefright/ACodec.cpp
@@ -767,7 +767,8 @@ status_t ACodec::handleSetSurface(const sp<Surface> &surface) {
     }
 
     // push blank buffers to previous window if requested
-    if (mFlags & kFlagPushBlankBuffersToNativeWindowOnShutdown) {
+    if (mFlags & kFlagPushBlankBuffersToNativeWindowOnShutdown ||
+        mFlags & kFlagPushBlankBuffersToNativeWindowOnSwitch) {
         pushBlankBuffersToNativeWindow(mNativeWindow.get());
     }
 
@@ -1983,6 +1984,12 @@ status_t ACodec::configureCodec(
                     && push != 0) {
                 mFlags |= kFlagPushBlankBuffersToNativeWindowOnShutdown;
             }
+
+            int32_t val;
+            if (msg->findInt32("push-blank-buffers-on-switch", &val)
+                    && val != 0) {
+                mFlags |= kFlagPushBlankBuffersToNativeWindowOnSwitch;
+            }
         }
 
         int32_t rotationDegrees;