Add a test utility for MediaMuxer.

This test/utility copy samples from one video and mux into another video.
It support trimming, cutting audio or video track.
It can run simply as command line like:
adb shell muxer -a -v -s 1000 -e 8000 "/sdcard/DCIM/Camera/VID_*.mp4"

bug:7991013

Change-Id: I8a2eeff3cabd001b6b2a7062d991dd076edbf22e
diff --git a/cmds/stagefright/Android.mk b/cmds/stagefright/Android.mk
index a59186a..d583e65 100644
--- a/cmds/stagefright/Android.mk
+++ b/cmds/stagefright/Android.mk
@@ -165,3 +165,26 @@
 
 include $(BUILD_EXECUTABLE)
 
+################################################################################
+
+include $(CLEAR_VARS)
+
+LOCAL_SRC_FILES:=               \
+        muxer.cpp            \
+
+LOCAL_SHARED_LIBRARIES := \
+	libstagefright liblog libutils libbinder libstagefright_foundation \
+        libmedia libgui libcutils libui libc
+
+LOCAL_C_INCLUDES:= \
+	frameworks/av/media/libstagefright \
+	$(TOP)/frameworks/native/include/media/openmax
+
+LOCAL_CFLAGS += -Wno-multichar
+
+LOCAL_MODULE_TAGS := debug
+
+LOCAL_MODULE:= muxer
+
+include $(BUILD_EXECUTABLE)
+