BufferQueue: Add producer buffer-released callback

Add a callback to the producer side, onBufferReleased, which will be
called every time the consumer releases a buffer back to the
BufferQueue. This will enable a buffer stream splitter to work
autonomously without having to block on dequeueBuffer.

The binder object used for the callback replaces the generic IBinder
token that was passed into IGraphicBufferProducer::connect to detect
the death of the producer. If a producer does not wish to listen for
buffer release events, it can pass in an instance of the
DummyProducerListener class defined in IProducerListener.h, if it even
cares about death events (BufferQueue doesn't enforce the token being
non-NULL, though perhaps we should).

Change-Id: I23935760673524abeafea2b58dccc3583b368710

1 files changed, 2 insertions, 2 deletions

diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index c306f9d651..6d2cb25bd4 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -119,9 +119,9 @@ void BufferQueue::cancelBuffer(int buf, const sp<Fence>& fence) {
     mProducer->cancelBuffer(buf, fence);
 }
 
-status_t BufferQueue::connect(const sp<IBinder>& token,
+status_t BufferQueue::connect(const sp<IProducerListener>& listener,
         int api, bool producerControlledByApp, QueueBufferOutput* output) {
-    return mProducer->connect(token, api, producerControlledByApp, output);
+    return mProducer->connect(listener, api, producerControlledByApp, output);
 }
 
 status_t BufferQueue::disconnect(int api) {