stagefright: add nonblocking MediaBufferGroup.acquire_buffer method

Bug: 15699665
Change-Id: I31c1ab4413c62ff3dd4e0d5b06a398064b4aaddd

1 files changed, 7 insertions, 1 deletions

diff --git a/media/libstagefright/MediaBufferGroup.cpp b/media/libstagefright/MediaBufferGroup.cpp
index 80aae51..6ac6d4a 100644
--- a/media/libstagefright/MediaBufferGroup.cpp
+++ b/media/libstagefright/MediaBufferGroup.cpp
@@ -55,7 +55,8 @@ void MediaBufferGroup::add_buffer(MediaBuffer *buffer) {
     mLastBuffer = buffer;
 }
 
-status_t MediaBufferGroup::acquire_buffer(MediaBuffer **out) {
+status_t MediaBufferGroup::acquire_buffer(
+        MediaBuffer **out, bool nonBlocking) {
     Mutex::Autolock autoLock(mLock);
 
     for (;;) {
@@ -70,6 +71,11 @@ status_t MediaBufferGroup::acquire_buffer(MediaBuffer **out) {
             }
         }
 
+        if (nonBlocking) {
+            *out = NULL;
+            return WOULD_BLOCK;
+        }
+
         // All buffers are in use. Block until one of them is returned to us.
         mCondition.wait(mLock);
     }