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// Copyright 2014 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 <cstdlib>
#include <vector>
#include "base/bind.h"
#include "base/bind_helpers.h"
#include "base/synchronization/condition_variable.h"
#include "base/synchronization/lock.h"
#include "base/time/time.h"
#include "media/cast/cast_config.h"
#include "media/cast/receiver/video_decoder.h"
#include "media/cast/sender/vp8_encoder.h"
#include "media/cast/test/utility/default_config.h"
#include "media/cast/test/utility/standalone_cast_environment.h"
#include "media/cast/test/utility/video_utility.h"
#include "testing/gtest/include/gtest/gtest.h"
namespace media {
namespace cast {
namespace {
const int kStartingWidth = 360;
const int kStartingHeight = 240;
const int kFrameRate = 10;
VideoSenderConfig GetVideoSenderConfigForTest() {
VideoSenderConfig config = GetDefaultVideoSenderConfig();
config.max_frame_rate = kFrameRate;
return config;
}
} // namespace
class VideoDecoderTest : public ::testing::TestWithParam<Codec> {
public:
VideoDecoderTest()
: cast_environment_(new StandaloneCastEnvironment()),
vp8_encoder_(GetVideoSenderConfigForTest()),
cond_(&lock_) {
vp8_encoder_.Initialize();
}
virtual ~VideoDecoderTest() {
// Make sure all threads have stopped before the environment goes away.
cast_environment_->Shutdown();
}
protected:
void SetUp() final {
video_decoder_.reset(new VideoDecoder(cast_environment_, GetParam()));
CHECK_EQ(STATUS_INITIALIZED, video_decoder_->InitializationResult());
next_frame_size_ = gfx::Size(kStartingWidth, kStartingHeight);
next_frame_timestamp_ = base::TimeDelta();
last_frame_id_ = 0;
seen_a_decoded_frame_ = false;
total_video_frames_feed_in_ = 0;
total_video_frames_decoded_ = 0;
}
void SetNextFrameSize(const gfx::Size& size) {
next_frame_size_ = size;
}
// Called from the unit test thread to create another EncodedFrame and push it
// into the decoding pipeline.
void FeedMoreVideo(int num_dropped_frames) {
// Prepare a simulated EncodedFrame to feed into the VideoDecoder.
const scoped_refptr<VideoFrame> video_frame =
VideoFrame::CreateFrame(VideoFrame::YV12,
next_frame_size_,
gfx::Rect(next_frame_size_),
next_frame_size_,
next_frame_timestamp_);
const base::TimeTicks reference_time =
base::TimeTicks::UnixEpoch() + next_frame_timestamp_;
next_frame_timestamp_ += base::TimeDelta::FromSeconds(1) / kFrameRate;
PopulateVideoFrame(video_frame.get(), 0);
// Encode |frame| into |encoded_frame->data|.
scoped_ptr<EncodedFrame> encoded_frame(new EncodedFrame());
// Test only supports VP8, currently.
CHECK_EQ(CODEC_VIDEO_VP8, GetParam());
vp8_encoder_.Encode(video_frame, reference_time, encoded_frame.get());
// Rewrite frame IDs for testing purposes.
encoded_frame->frame_id = last_frame_id_ + 1 + num_dropped_frames;
if (encoded_frame->dependency == EncodedFrame::KEY)
encoded_frame->referenced_frame_id = encoded_frame->frame_id;
else
encoded_frame->referenced_frame_id = encoded_frame->frame_id - 1;
last_frame_id_ = encoded_frame->frame_id;
ASSERT_EQ(reference_time, encoded_frame->reference_time);
{
base::AutoLock auto_lock(lock_);
++total_video_frames_feed_in_;
}
cast_environment_->PostTask(
CastEnvironment::MAIN,
FROM_HERE,
base::Bind(&VideoDecoder::DecodeFrame,
base::Unretained(video_decoder_.get()),
base::Passed(&encoded_frame),
base::Bind(&VideoDecoderTest::OnDecodedFrame,
base::Unretained(this),
video_frame,
num_dropped_frames == 0)));
}
// Blocks the caller until all video that has been feed in has been decoded.
void WaitForAllVideoToBeDecoded() {
DCHECK(!cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
base::AutoLock auto_lock(lock_);
while (total_video_frames_decoded_ < total_video_frames_feed_in_)
cond_.Wait();
EXPECT_EQ(total_video_frames_feed_in_, total_video_frames_decoded_);
}
private:
// Called by |vp8_decoder_| to deliver each frame of decoded video.
void OnDecodedFrame(const scoped_refptr<VideoFrame>& expected_video_frame,
bool should_be_continuous,
const scoped_refptr<VideoFrame>& video_frame,
bool is_continuous) {
DCHECK(cast_environment_->CurrentlyOn(CastEnvironment::MAIN));
// A NULL |video_frame| indicates a decode error, which we don't expect.
ASSERT_FALSE(!video_frame.get());
// Did the decoder detect whether frames were dropped?
EXPECT_EQ(should_be_continuous, is_continuous);
// Does the video data seem to be intact?
EXPECT_EQ(expected_video_frame->coded_size().width(),
video_frame->coded_size().width());
EXPECT_EQ(expected_video_frame->coded_size().height(),
video_frame->coded_size().height());
EXPECT_LT(40.0, I420PSNR(expected_video_frame, video_frame));
// TODO(miu): Once we start using VideoFrame::timestamp_, check that here.
// Signal the main test thread that more video was decoded.
base::AutoLock auto_lock(lock_);
++total_video_frames_decoded_;
cond_.Signal();
}
const scoped_refptr<StandaloneCastEnvironment> cast_environment_;
scoped_ptr<VideoDecoder> video_decoder_;
gfx::Size next_frame_size_;
base::TimeDelta next_frame_timestamp_;
uint32 last_frame_id_;
bool seen_a_decoded_frame_;
Vp8Encoder vp8_encoder_;
base::Lock lock_;
base::ConditionVariable cond_;
int total_video_frames_feed_in_;
int total_video_frames_decoded_;
DISALLOW_COPY_AND_ASSIGN(VideoDecoderTest);
};
TEST_P(VideoDecoderTest, DecodesFrames) {
const int kNumFrames = 10;
for (int i = 0; i < kNumFrames; ++i)
FeedMoreVideo(0);
WaitForAllVideoToBeDecoded();
}
TEST_P(VideoDecoderTest, RecoversFromDroppedFrames) {
const int kNumFrames = 100;
int next_drop_at = 3;
int next_num_dropped = 1;
for (int i = 0; i < kNumFrames; ++i) {
if (i == next_drop_at) {
const int num_dropped = next_num_dropped++;
next_drop_at *= 2;
i += num_dropped;
FeedMoreVideo(num_dropped);
} else {
FeedMoreVideo(0);
}
}
WaitForAllVideoToBeDecoded();
}
TEST_P(VideoDecoderTest, DecodesFramesOfVaryingSizes) {
std::vector<gfx::Size> frame_sizes;
frame_sizes.push_back(gfx::Size(1280, 720));
frame_sizes.push_back(gfx::Size(640, 360)); // Shrink both dimensions.
frame_sizes.push_back(gfx::Size(300, 200)); // Shrink both dimensions again.
frame_sizes.push_back(gfx::Size(200, 300)); // Same area.
frame_sizes.push_back(gfx::Size(600, 400)); // Grow both dimensions.
frame_sizes.push_back(gfx::Size(638, 400)); // Shrink only one dimension.
frame_sizes.push_back(gfx::Size(638, 398)); // Shrink the other dimension.
frame_sizes.push_back(gfx::Size(320, 180)); // Shrink both dimensions again.
frame_sizes.push_back(gfx::Size(322, 180)); // Grow only one dimension.
frame_sizes.push_back(gfx::Size(322, 182)); // Grow the other dimension.
frame_sizes.push_back(gfx::Size(1920, 1080)); // Grow both dimensions again.
// Encode one frame at each size.
for (const auto& frame_size : frame_sizes) {
SetNextFrameSize(frame_size);
FeedMoreVideo(0);
}
// Encode 10 frames at each size.
for (const auto& frame_size : frame_sizes) {
SetNextFrameSize(frame_size);
const int kNumFrames = 10;
for (int i = 0; i < kNumFrames; ++i)
FeedMoreVideo(0);
}
WaitForAllVideoToBeDecoded();
}
INSTANTIATE_TEST_CASE_P(,
VideoDecoderTest,
::testing::Values(CODEC_VIDEO_VP8));
} // namespace cast
} // namespace media
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