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

1 files changed, 15 insertions, 0 deletions

diff --git a/libs/gui/BufferQueue.cpp b/libs/gui/BufferQueue.cpp
index af857fd3ea..8584dc9b3f 100644
--- a/libs/gui/BufferQueue.cpp
+++ b/libs/gui/BufferQueue.cpp
@@ -93,6 +93,10 @@ status_t BufferQueue::disconnect(int api) {
     return mProducer->disconnect(api);
 }
 
+status_t BufferQueue::setSidebandStream(const sp<NativeHandle>& stream) {
+    return mProducer->setSidebandStream(stream);
+}
+
 status_t BufferQueue::acquireBuffer(BufferItem* buffer, nsecs_t presentWhen) {
     return mConsumer->acquireBuffer(buffer, presentWhen);
 }
@@ -148,8 +152,19 @@ status_t BufferQueue::setTransformHint(uint32_t hint) {
     return mConsumer->setTransformHint(hint);
 }
 
+sp<NativeHandle> BufferQueue::getSidebandStream() const {
+    return mConsumer->getSidebandStream();
+}
+
 void BufferQueue::dump(String8& result, const char* prefix) const {
     mConsumer->dump(result, prefix);
 }
 
+void BufferQueue::ProxyConsumerListener::onSidebandStreamChanged() {
+    sp<ConsumerListener> listener(mConsumerListener.promote());
+    if (listener != NULL) {
+        listener->onSidebandStreamChanged();
+    }
+}
+
 }; // namespace android