Add support for timestamps into SurfaceTexture.

API addition: The timestamps are represented as nanoseconds from some
arbitrary time point. Like the SurfaceTexture transform matrix, the
timestamp retrieved by getTimestamp is for the last frame sent to the
GL texture using updateTexImage().

Camera HAL change: Expect vendors to set these timestamps using
native_window_set_buffers_timestamp().  For now, they are
autogenerated by SurfaceTextureClient if set_buffers_timestamp() is
never called, but such timing is likely not accurate enough to pass a
CTS test.

bug:3300707

Change-Id: Ife131a0c2a826ac27342e11b8a6c42ff49e1bea7

1 files changed, 8 insertions, 1 deletions

diff --git a/core/jni/android/graphics/SurfaceTexture.cpp b/core/jni/android/graphics/SurfaceTexture.cpp
index c4e5878..2f70190 100644
--- a/core/jni/android/graphics/SurfaceTexture.cpp
+++ b/core/jni/android/graphics/SurfaceTexture.cpp
@@ -171,6 +171,12 @@ static void SurfaceTexture_getTransformMatrix(JNIEnv* env, jobject thiz,
     env->ReleaseFloatArrayElements(jmtx, mtx, 0);
 }
 
+static jlong SurfaceTexture_getTimestamp(JNIEnv* env, jobject thiz)
+{
+    sp<SurfaceTexture> surfaceTexture(SurfaceTexture_getSurfaceTexture(env, thiz));
+    return surfaceTexture->getTimestamp();
+}
+
 // ----------------------------------------------------------------------------
 
 const char* const kSurfaceTextureClassPathName = "android/graphics/SurfaceTexture";
@@ -178,9 +184,10 @@ const char* const kSurfaceTextureClassPathName = "android/graphics/SurfaceTextur
 static JNINativeMethod gSurfaceTextureMethods[] = {
     {"nativeClassInit",          "()V",   (void*)SurfaceTexture_classInit },
     {"nativeInit",               "(ILjava/lang/Object;)V", (void*)SurfaceTexture_init },
-    {"nativeFinalize",            "()V",  (void*)SurfaceTexture_finalize },
+    {"nativeFinalize",           "()V",   (void*)SurfaceTexture_finalize },
     {"nativeUpdateTexImage",     "()V",   (void*)SurfaceTexture_updateTexImage },
     {"nativeGetTransformMatrix", "([F)V", (void*)SurfaceTexture_getTransformMatrix },
+    {"nativeGetTimestamp",       "()J",   (void*)SurfaceTexture_getTimestamp }
 };
 
 int register_android_graphics_SurfaceTexture(JNIEnv* env)