Android.mk file for vpx unittests

These changes are to support automated regressions of vpx on android
	new file:   test/android/Android.mk
	new file:   test/android/README
	new file:   test/android/get_files.py

Change-Id: I52c8e9daf3676a3561badbe710ec3a16fed72abd

test/android/Android.mk

+# Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+#
+# This make file builds vpx_test app for android.
+# The test app itself runs on the command line through adb shell
+# The paths are really messed up as the libvpx make file
+# expects to be made from a parent directory.
+# TODO(joshualitt)
+# Fix android make files so they can be built from anywhere, will require
+# changing the libvpx make file and this one.
+CUR_WD := $(call my-dir)
+BINDINGS_DIR := $(CUR_WD)/../../..
+LOCAL_PATH := $(CUR_WD)/../../..
+
+#libvpx
+include $(CLEAR_VARS)
+include $(BINDINGS_DIR)/libvpx/build/make/Android.mk
+# Restore path
+# TODO joshualitt Fix makefiles so this is no longer needed
+LOCAL_PATH := $(CUR_WD)/../..
+
+#libgtest
+include $(CLEAR_VARS)
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := gtest
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/third_party/googletest/src/
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/third_party/googletest/src/include/
+LOCAL_SRC_FILES := ./third_party/googletest/src/src/gtest-all.cc
+include $(BUILD_STATIC_LIBRARY)
+
+#libnestegg
+include $(CLEAR_VARS)
+LOCAL_CPP_EXTENSION := .cc
+LOCAL_MODULE := nestegg
+NESTEGG_PATH := $(LOCAL_PATH)/nestegg
+LOCAL_C_INCLUDES := $(NESTEGG_PATH)/include
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/
+LOCAL_C_INCLUDES += $(NESTEGG_PATH)/halloc/
+LOCAL_SRC_FILES := ./nestegg/halloc/src/halloc.c
+LOCAL_SRC_FILES += ./nestegg/src/nestegg.c
+include $(BUILD_STATIC_LIBRARY)
+
+#libvpx_test
+include $(CLEAR_VARS)
+LOCAL_MODULE := libvpx_test
+LOCAL_STATIC_LIBRARIES := gtest
+LOCAL_STATIC_LIBRARIES += nestegg
+LOCAL_STATIC_LIBRARIES += cpufeatures
+LOCAL_SHARED_LIBRARIES := vpx
+LOCAL_C_INCLUDES := $(LOCAL_PATH)/
+LOCAL_C_INCLUDES += $(BINDINGS_DIR)/
+LOCAL_C_INCLUDES += $(LOCAL_PATH)/third_party/googletest/src/include
+LOCAL_SRC_FILES := ./args.c
+LOCAL_SRC_FILES += ./md5_utils.c
+LOCAL_SRC_FILES += ./test/decode_test_driver.cc
+LOCAL_SRC_FILES += ./test/test_libvpx.cc
+LOCAL_SRC_FILES += ./test/test_vector_test.cc
+include $(BUILD_EXECUTABLE)

test/android/README

+Android.mk will build vpx unittests on android.
+1) configure libvpx from the parent directory:
+./libvpx/configure --target=armv7-android-gcc --enable-external-build --enable-postproc --disable-install-srcs --enable-multi-res-encoding --enable-temporal-denoising --disable-unit-tests --disable-install-docs --disable-examples --disable-runtime-cpu-detect --sdk=$NDK
+
+2) from the parent directory, invoke ndk-build:
+NDK_PROJECT_PATH=. ndk-build APP_BUILD_SCRIPT=./libvpx/test/android/Android.mk APP_ABI=armeabi-v7a APP_PLATFORM=android-18 APP_OPTIM=release APP_STL=gnustl_static APP_CPPFLAGS=-frtti
+
+3) Run get_files.py to download the test files:
+python get_files.py -i /path/to/test-data.sha1 -o /path/to/put/files -u http://libvpx-test-file-url
+
+NOTE: currently the url of the test files is http://downloads.webmproject.org/test_data/libvpx
+
+4) transfer files to device using adb.  Currently, I put these files in /data/local/tmp
+
+adb push /path/to/test_files /data/local/tmp
+adb push /path/to/built_libs /data/local/tmp
+
+NOTE: Built_libs defaults to parent_dir/libs/armeabi-v7a
+
+5) run tests:
+adb shell
+(on device)
+cd /data/local/tmp
+LD_LIBRARY_PATH=. ./vpx_test

test/android/get_files.py

+# Copyright (c) 2013 The WebM project authors. All Rights Reserved.
+#
+# Use of this source code is governed by a BSD-style license
+# that can be found in the LICENSE file in the root of the source
+# tree. An additional intellectual property rights grant can be found
+# in the file PATENTS.  All contributing project authors may
+# be found in the AUTHORS file in the root of the source tree.
+#
+# This simple script pulls test files from the webm homepage
+# It is intelligent enough to only pull files if
+#   1) File / test_data folder does not exist
+#   2) SHA mismatch
+
+import pycurl
+import csv
+import hashlib
+import re
+import os.path
+import time
+import itertools
+import sys
+import getopt
+
+#globals
+url = ''
+file_list_path = ''
+local_resource_path = ''
+
+# Helper functions:
+# A simple function which returns the sha hash of a file in hex
+def get_file_sha(filename):
+  try:
+    sha_hash = hashlib.sha1()
+    with open(filename, 'rb') as file:
+      buf = file.read(HASH_CHUNK)
+      while len(buf) > 0:
+        sha_hash.update(buf)
+        buf = file.read(HASH_CHUNK)
+      return sha_hash.hexdigest()
+  except IOError:
+    print "Error reading " + filename
+
+# Downloads a file from a url, and then checks the sha against the passed
+# in sha
+def download_and_check_sha(url, filename, sha):
+  path = os.path.join(local_resource_path, filename)
+  fp = open(path, "wb")
+  curl = pycurl.Curl()
+  curl.setopt(pycurl.URL, url + "/" + filename)
+  curl.setopt(pycurl.WRITEDATA, fp)
+  curl.perform()
+  curl.close()
+  fp.close()
+  return get_file_sha(path) == sha
+
+#constants
+ftp_retries = 3
+
+SHA_COL = 0
+NAME_COL = 1
+EXPECTED_COL = 2
+HASH_CHUNK = 65536
+
+# Main script
+try:
+  opts, args = \
+      getopt.getopt(sys.argv[1:], \
+                    "u:i:o:", ["url=", "input_csv=", "output_dir="])
+except:
+  print 'get_files.py -u <url> -i <input_csv> -o <output_dir>'
+  sys.exit(2)
+
+for opt, arg in opts:
+  if opt == '-u':
+    url = arg
+  elif opt in ("-i", "--input_csv"):
+    file_list_path = os.path.join(arg)
+  elif opt in ("-o", "--output_dir"):
+    local_resource_path = os.path.join(arg)
+
+if len(sys.argv) != 7:
+  print "Expects two paths and a url!"
+  exit(1)
+
+if not os.path.isdir(local_resource_path):
+  os.makedirs(local_resource_path)
+
+file_list_csv = open(file_list_path, "rb")
+
+# Our 'csv' file uses multiple spaces as a delimiter, python's
+# csv class only uses single character delimiters, so we convert them below
+file_list_reader = csv.reader((re.sub(' +', ' ', line) \
+    for line in file_list_csv), delimiter = ' ')
+
+file_shas = []
+file_names = []
+
+for row in file_list_reader:
+  if len(row) != EXPECTED_COL:
+      continue
+  file_shas.append(row[SHA_COL])
+  file_names.append(row[NAME_COL])
+
+file_list_csv.close()
+
+# Download files, only if they don't already exist and have correct shas
+for filename, sha in itertools.izip(file_names, file_shas):
+  path = os.path.join(local_resource_path, filename)
+  if os.path.isfile(path) \
+      and get_file_sha(path) == sha:
+    print path + ' exists, skipping'
+    continue
+  for retry in range(0, ftp_retries):
+    print "Downloading " + path
+    if not download_and_check_sha(url, filename, sha):
+      print "Sha does not match, retrying..."
+    else:
+      break