media/cast/receiver/video_decoder_unittest.cc

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include <cstdlib>
   6
   7 #include "base/bind.h"
   8 #include "base/bind_helpers.h"
   9 #include "base/synchronization/condition_variable.h"
  10 #include "base/synchronization/lock.h"
  11 #include "base/time/time.h"
  12 #include "media/cast/cast_config.h"
  13 #include "media/cast/receiver/video_decoder.h"
  14 #include "media/cast/sender/vp8_encoder.h"
  15 #include "media/cast/test/utility/standalone_cast_environment.h"
  16 #include "media/cast/test/utility/video_utility.h"
  17 #include "testing/gtest/include/gtest/gtest.h"
  18
  19 namespace media {
  20 namespace cast {
  21
  22 namespace {
  23
  24 const int kWidth = 360;
  25 const int kHeight = 240;
  26 const int kFrameRate = 10;
  27
  28 VideoSenderConfig GetVideoSenderConfigForTest() {
  29   VideoSenderConfig config;
  30   config.width = kWidth;
  31   config.height = kHeight;
  32   config.max_frame_rate = kFrameRate;
  33   return config;
  34 }
  35
  36 }  // namespace
  37
  38 class VideoDecoderTest : public ::testing::TestWithParam<Codec> {
  39  public:
  40   VideoDecoderTest()
  41       : cast_environment_(new StandaloneCastEnvironment()),
  42         vp8_encoder_(GetVideoSenderConfigForTest(), 0),
  43         cond_(&lock_) {
  44     vp8_encoder_.Initialize();
  45   }
  46
  47   virtual ~VideoDecoderTest() {
  48     // Make sure all threads have stopped before the environment goes away.
  49     cast_environment_->Shutdown();
  50   }
  51
  52  protected:
  53   virtual void SetUp() OVERRIDE {
  54     video_decoder_.reset(new VideoDecoder(cast_environment_, GetParam()));
  55     CHECK_EQ(STATUS_VIDEO_INITIALIZED, video_decoder_->InitializationResult());
  56
  57     next_frame_timestamp_ = base::TimeDelta();
  58     last_frame_id_ = 0;
  59     seen_a_decoded_frame_ = false;
  60
  61     total_video_frames_feed_in_ = 0;
  62     total_video_frames_decoded_ = 0;
  63   }
  64
  65   // Called from the unit test thread to create another EncodedFrame and push it
  66   // into the decoding pipeline.
  67   void FeedMoreVideo(int num_dropped_frames) {
  68     // Prepare a simulated EncodedFrame to feed into the VideoDecoder.
  69
  70     const gfx::Size frame_size(kWidth, kHeight);
  71     const scoped_refptr<VideoFrame> video_frame =
  72         VideoFrame::CreateFrame(VideoFrame::YV12,
  73                                 frame_size,
  74                                 gfx::Rect(frame_size),
  75                                 frame_size,
  76                                 next_frame_timestamp_);
  77     next_frame_timestamp_ += base::TimeDelta::FromSeconds(1) / kFrameRate;
  78     PopulateVideoFrame(video_frame.get(), 0);
  79
  80     // Encode |frame| into |encoded_frame->data|.
  81     scoped_ptr<EncodedFrame> encoded_frame(
  82         new EncodedFrame());
  83     // Test only supports VP8, currently.
  84     CHECK_EQ(CODEC_VIDEO_VP8, GetParam());
  85     vp8_encoder_.Encode(video_frame, encoded_frame.get());
  86     encoded_frame->frame_id = last_frame_id_ + 1 + num_dropped_frames;
  87     last_frame_id_ = encoded_frame->frame_id;
  88
  89     {
  90       base::AutoLock auto_lock(lock_);
  91       ++total_video_frames_feed_in_;
  92     }
  93
  94     cast_environment_->PostTask(
  95         CastEnvironment::MAIN,
  96         FROM_HERE,
  97         base::Bind(&VideoDecoder::DecodeFrame,
  98                    base::Unretained(video_decoder_.get()),
  99                    base::Passed(&encoded_frame),
 100                    base::Bind(&VideoDecoderTest::OnDecodedFrame,
 101                               base::Unretained(this),
 102                               video_frame,
 103                               num_dropped_frames == 0)));
 104   }
 105
 106   // Blocks the caller until all video that has been feed in has been decoded.
 107   void WaitForAllVideoToBeDecoded() {
 108     DCHECK(!cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 109     base::AutoLock auto_lock(lock_);
 110     while (total_video_frames_decoded_ < total_video_frames_feed_in_)
 111       cond_.Wait();
 112     EXPECT_EQ(total_video_frames_feed_in_, total_video_frames_decoded_);
 113   }
 114
 115  private:
 116   // Called by |vp8_decoder_| to deliver each frame of decoded video.
 117   void OnDecodedFrame(const scoped_refptr<VideoFrame>& expected_video_frame,
 118                       bool should_be_continuous,
 119                       const scoped_refptr<VideoFrame>& video_frame,
 120                       bool is_continuous) {
 121     DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
 122
 123     // A NULL |video_frame| indicates a decode error, which we don't expect.
 124     ASSERT_FALSE(!video_frame.get());
 125
 126     // Did the decoder detect whether frames were dropped?
 127     EXPECT_EQ(should_be_continuous, is_continuous);
 128
 129     // Does the video data seem to be intact?
 130     EXPECT_EQ(expected_video_frame->coded_size().width(),
 131               video_frame->coded_size().width());
 132     EXPECT_EQ(expected_video_frame->coded_size().height(),
 133               video_frame->coded_size().height());
 134     EXPECT_LT(40.0, I420PSNR(expected_video_frame, video_frame));
 135     // TODO(miu): Once we start using VideoFrame::timestamp_, check that here.
 136
 137     // Signal the main test thread that more video was decoded.
 138     base::AutoLock auto_lock(lock_);
 139     ++total_video_frames_decoded_;
 140     cond_.Signal();
 141   }
 142
 143   const scoped_refptr<StandaloneCastEnvironment> cast_environment_;
 144   scoped_ptr<VideoDecoder> video_decoder_;
 145   base::TimeDelta next_frame_timestamp_;
 146   uint32 last_frame_id_;
 147   bool seen_a_decoded_frame_;
 148
 149   Vp8Encoder vp8_encoder_;
 150
 151   base::Lock lock_;
 152   base::ConditionVariable cond_;
 153   int total_video_frames_feed_in_;
 154   int total_video_frames_decoded_;
 155
 156   DISALLOW_COPY_AND_ASSIGN(VideoDecoderTest);
 157 };
 158
 159 TEST_P(VideoDecoderTest, DecodesFrames) {
 160   const int kNumFrames = 10;
 161   for (int i = 0; i < kNumFrames; ++i)
 162     FeedMoreVideo(0);
 163   WaitForAllVideoToBeDecoded();
 164 }
 165
 166 TEST_P(VideoDecoderTest, RecoversFromDroppedFrames) {
 167   const int kNumFrames = 100;
 168   int next_drop_at = 3;
 169   int next_num_dropped = 1;
 170   for (int i = 0; i < kNumFrames; ++i) {
 171     if (i == next_drop_at) {
 172       const int num_dropped = next_num_dropped++;
 173       next_drop_at *= 2;
 174       i += num_dropped;
 175       FeedMoreVideo(num_dropped);
 176     } else {
 177       FeedMoreVideo(0);
 178     }
 179   }
 180   WaitForAllVideoToBeDecoded();
 181 }
 182
 183 INSTANTIATE_TEST_CASE_P(VideoDecoderTestScenarios,
 184                         VideoDecoderTest,
 185                         ::testing::Values(CODEC_VIDEO_VP8));
 186
 187 }  // namespace cast
 188 }  // namespace media