commit 2cec0dfa9f97b87733b8b250b49729fc6bb3a60a
author Ruchit Sharma <ruchits@nvidia.com> Wed Aug 20 16:02:08 2014 -0400
committer Chien-Yu Chen <cychen@google.com> Mon Dec 15 11:54:41 2014 -0800
tree 32dc6deae539198198775b871dec33a5b7d65902
parent 8ddb02230d02968d471aa41b22433957c38827c0

Camera2Client: flush requests in stopPreviewL

Requests queued in the pipeline have little meaning after the app
calls stopPreview(). Flushing will help improve the switch KPI.

bug 17340914

Change-Id: I899d69aa3b0fd41f028760290a81013297712fed

services/camera/libcameraservice/api1/Camera2Client.cpp

diff --git a/services/camera/libcameraservice/api1/Camera2Client.cpp b/services/camera/libcameraservice/api1/Camera2Client.cpp
index 6e7824e..dcab4ad 100644
--- a/services/camera/libcameraservice/api1/Camera2Client.cpp
+++ b/services/camera/libcameraservice/api1/Camera2Client.cpp
@@ -917,6 +917,15 @@
                 ALOGE("%s: Camera %d: Can't stop streaming: %s (%d)",
                         __FUNCTION__, mCameraId, strerror(-res), res);
             }
+
+            // Flush all in-process captures and buffer in order to stop
+            // preview faster.
+            res = mDevice->flush();
+            if (res != OK) {
+                ALOGE("%s: Camera %d: Unable to flush pending requests: %s (%d)",
+                        __FUNCTION__, mCameraId, strerror(-res), res);
+            }
+
             res = mDevice->waitUntilDrained();
             if (res != OK) {
                 ALOGE("%s: Camera %d: Waiting to stop streaming failed: %s (%d)",