commit 399184a4cd728ea1421fb0bc1722274a29e38f4a
author Jesse Hall <jessehall@google.com> Mon Mar 03 15:42:54 2014 -0800
committer Jesse Hall <jessehall@google.com> Tue Mar 11 12:23:14 2014 -0700
tree 7185bc1ac84eec1afebc221ed91d90b90fa9a7fb
parent 05fe2d1cfbf580c04ef1b1f0130b5dccba6dfe33

Add sideband streams to BufferQueue and related classes

Sideband streams are essentially a device-specific buffer queue that
bypasses the BufferQueue system. They can be used for situations with
hard real-time requirements like high-quality TV and video playback
with A/V sync. A handle to the stream is provided by the source HAL,
and attached to a BufferQueue. The sink HAL can read buffers via the
stream handle rather than acquiring individual buffers from the
BufferQueue.

Change-Id: Ib3f262eddfc520f4bbe3d9b91753ed7dd09d3a9b

libs/gui/IGraphicBufferConsumer.cpp

diff --git a/libs/gui/IGraphicBufferConsumer.cpp b/libs/gui/IGraphicBufferConsumer.cpp
index 876c895..c97d15b 100644
--- a/libs/gui/IGraphicBufferConsumer.cpp
+++ b/libs/gui/IGraphicBufferConsumer.cpp
@@ -24,6 +24,7 @@
 #include <sys/types.h>
 
 #include <utils/Errors.h>
+#include <utils/NativeHandle.h>
 
 #include <binder/Parcel.h>
 #include <binder/IInterface.h>
@@ -195,6 +196,7 @@
     SET_DEFAULT_BUFFER_FORMAT,
     SET_CONSUMER_USAGE_BITS,
     SET_TRANSFORM_HINT,
+    GET_SIDEBAND_STREAM,
     DUMP,
 };
 
@@ -354,6 +356,20 @@
         return reply.readInt32();
     }
 
+    virtual sp<NativeHandle> getSidebandStream() const {
+        Parcel data, reply;
+        status_t err;
+        data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());
+        if ((err = remote()->transact(GET_SIDEBAND_STREAM, data, &reply)) != NO_ERROR) {
+            return NULL;
+        }
+        sp<NativeHandle> stream;
+        if (reply.readInt32()) {
+            stream = NativeHandle::create(reply.readNativeHandle());
+        }
+        return stream;
+    }
+
     virtual void dump(String8& result, const char* prefix) const {
         Parcel data, reply;
         data.writeInterfaceToken(IGraphicBufferConsumer::getInterfaceDescriptor());