Adding third_party/openh264 build files for encoding

content/browser/media/openh264_unittests.cc

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+#include "third_party/openh264/testing/h264_codec_tester.h"
+#include "third_party/openh264/testing/h264_decoder_impl.h"
+#include "third_party/openh264/testing/h264_encoder_impl.h"
+#include "third_party/openh264/testing/i420_utils.h"
+#include "third_party/webrtc/common_video/libyuv/include/webrtc_libyuv.h"
+
+namespace openh264 {
+
+static const unsigned short kVideoWidth = 320;
+static const unsigned short kVideoHeight = 240;
+
+static const size_t kNumSampleFrames = 10;
+
+class OpenH264Tests : public testing::Test {
+ protected:
+  OpenH264Tests() {
+    int shade = 0;

[torbjorng, 2015/11/18 14:41:09]

Note that shade here will go from 0 to 225, since the accumulation is truncated
and the loop does 10 instead of 11 iteration. Perhaps use i*255/10 instead and
use i <= kNumSampleFrames (with corresponding sample_frames_ allocation
adjustments).

[hbos_chromium, 2015/11/18 15:55:04]

Done.

+    for (size_t i = 0; i < kNumSampleFrames; ++i) {
+      CreateRgbFrame(&sample_frames_[i], kVideoWidth, kVideoHeight,
+                     shade, shade, shade);
+      shade += 255 / kNumSampleFrames;
+    }
+  }
+  ~OpenH264Tests() override {}
+
+  VideoFrame sample_frames_[kNumSampleFrames];
+  H264CodecTester codec_tester_;
+};
+
+TEST_F(OpenH264Tests, EncodeDecodeCompareFrames) {
+  const int kNumFrames = 30;
+
+  ASSERT_TRUE(codec_tester_.Init(kVideoWidth, kVideoHeight));
+  double avg_ssim = 0.0;
+  for (size_t i = 0; i < kNumFrames; ++i) {
+    VideoFrame* original_frame = &sample_frames_[i % kNumSampleFrames];
+    ASSERT_TRUE(codec_tester_.Encode(*original_frame));
+    VideoFrame* decoded_frame = codec_tester_.Decode();
+    ASSERT_TRUE(decoded_frame != nullptr);
+
+    avg_ssim += webrtc::I420SSIM(original_frame, decoded_frame);
+  }
+  avg_ssim /= kNumFrames;
+
+  ASSERT_GE(avg_ssim, 0.9) << "Expected decoded frames to be more similar (on "
+                           << "average) to the original frames (SSIM too low)";
+}
+
+}  // namespace openh264