Add test for the vp8cx_set_ref example.

Change-Id: I68850699ecaebbbb7962cbc1c9bc85e92a0ea5ca

test/vp8cx_set_ref.sh

+#!/bin/sh
+##
+##  Copyright (c) 2014 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 file tests the libvpx vp8cx_set_ref example. To add new tests to this
+##  file, do the following:
+##    1. Write a shell function (this is your test).
+##    2. Add the function to vp8cx_set_ref_tests (on a new line).
+##
+. $(dirname $0)/tools_common.sh
+
+# Environment check: $YUV_RAW_INPUT is required.
+vp8cx_set_ref_verify_environment() {
+  if [ ! -e "${YUV_RAW_INPUT}" ]; then
+    echo "Libvpx test data must exist in LIBVPX_TEST_DATA_PATH."
+    return 1
+  fi
+}
+
+# Runs vp8cx_set_ref and updates the reference frame before encoding frame 90.
+# $1 is the codec name, which vp8cx_set_ref does not support at present: It's
+# currently used only to name the output file.
+# TODO(tomfinegan): Pass the codec param once the example is updated to support
+# VP9.
+vpx_set_ref() {
+  local encoder="${LIBVPX_BIN_PATH}/vp8cx_set_ref${VPX_TEST_EXE_SUFFIX}"
+  local codec="$1"
+  local output_file="${VPX_TEST_OUTPUT_DIR}/vp8cx_set_ref_${codec}.ivf"
+  local ref_frame_num=90
+
+  [ -x "${encoder}" ] || return 1
+
+  eval "${encoder}" "${YUV_RAW_INPUT_WIDTH}" "${YUV_RAW_INPUT_HEIGHT}" \
+      "${YUV_RAW_INPUT}" "${output_file}" "${ref_frame_num}" \
+      ${devnull}
+
+  [ -e "${output_file}" ] || return 1
+}
+
+vp8cx_set_ref_vp8() {
+  if [ "$(vp8_encode_available)" = "yes" ]; then
+    vpx_set_ref vp8 || return 1
+  fi
+}
+
+vp8cx_set_ref_tests="vp8cx_set_ref_vp8"
+
+run_tests vp8cx_set_ref_verify_environment "${vp8cx_set_ref_tests}"