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      1 // Copyright 2013 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 <stdint.h>
      6 
      7 #include "base/bind.h"
      8 #include "base/bind_helpers.h"
      9 #include "base/memory/scoped_ptr.h"
     10 #include "base/test/simple_test_tick_clock.h"
     11 #include "media/base/media.h"
     12 #include "media/cast/audio_sender/audio_sender.h"
     13 #include "media/cast/cast_config.h"
     14 #include "media/cast/cast_environment.h"
     15 #include "media/cast/rtcp/rtcp.h"
     16 #include "media/cast/test/fake_single_thread_task_runner.h"
     17 #include "media/cast/test/utility/audio_utility.h"
     18 #include "media/cast/transport/cast_transport_config.h"
     19 #include "media/cast/transport/cast_transport_sender_impl.h"
     20 #include "testing/gtest/include/gtest/gtest.h"
     21 
     22 namespace media {
     23 namespace cast {
     24 
     25 class TestPacketSender : public transport::PacketSender {
     26  public:
     27   TestPacketSender() : number_of_rtp_packets_(0), number_of_rtcp_packets_(0) {}
     28 
     29   virtual bool SendPacket(transport::PacketRef packet,
     30                           const base::Closure& cb) OVERRIDE {
     31     if (Rtcp::IsRtcpPacket(&packet->data[0], packet->data.size())) {
     32       ++number_of_rtcp_packets_;
     33     } else {
     34       // Check that at least one RTCP packet was sent before the first RTP
     35       // packet.  This confirms that the receiver will have the necessary lip
     36       // sync info before it has to calculate the playout time of the first
     37       // frame.
     38       if (number_of_rtp_packets_ == 0)
     39         EXPECT_LE(1, number_of_rtcp_packets_);
     40       ++number_of_rtp_packets_;
     41     }
     42     return true;
     43   }
     44 
     45   int number_of_rtp_packets() const { return number_of_rtp_packets_; }
     46 
     47   int number_of_rtcp_packets() const { return number_of_rtcp_packets_; }
     48 
     49  private:
     50   int number_of_rtp_packets_;
     51   int number_of_rtcp_packets_;
     52 
     53   DISALLOW_COPY_AND_ASSIGN(TestPacketSender);
     54 };
     55 
     56 class AudioSenderTest : public ::testing::Test {
     57  protected:
     58   AudioSenderTest() {
     59     InitializeMediaLibraryForTesting();
     60     testing_clock_ = new base::SimpleTestTickClock();
     61     testing_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
     62     task_runner_ = new test::FakeSingleThreadTaskRunner(testing_clock_);
     63     cast_environment_ =
     64         new CastEnvironment(scoped_ptr<base::TickClock>(testing_clock_).Pass(),
     65                             task_runner_,
     66                             task_runner_,
     67                             task_runner_);
     68     audio_config_.codec = transport::kOpus;
     69     audio_config_.use_external_encoder = false;
     70     audio_config_.frequency = kDefaultAudioSamplingRate;
     71     audio_config_.channels = 2;
     72     audio_config_.bitrate = kDefaultAudioEncoderBitrate;
     73     audio_config_.rtp_config.payload_type = 127;
     74 
     75     net::IPEndPoint dummy_endpoint;
     76 
     77     transport_sender_.reset(new transport::CastTransportSenderImpl(
     78         NULL,
     79         testing_clock_,
     80         dummy_endpoint,
     81         base::Bind(&UpdateCastTransportStatus),
     82         transport::BulkRawEventsCallback(),
     83         base::TimeDelta(),
     84         task_runner_,
     85         &transport_));
     86     audio_sender_.reset(new AudioSender(
     87         cast_environment_, audio_config_, transport_sender_.get()));
     88     task_runner_->RunTasks();
     89   }
     90 
     91   virtual ~AudioSenderTest() {}
     92 
     93   static void UpdateCastTransportStatus(transport::CastTransportStatus status) {
     94     EXPECT_EQ(transport::TRANSPORT_AUDIO_INITIALIZED, status);
     95   }
     96 
     97   base::SimpleTestTickClock* testing_clock_;  // Owned by CastEnvironment.
     98   TestPacketSender transport_;
     99   scoped_ptr<transport::CastTransportSenderImpl> transport_sender_;
    100   scoped_refptr<test::FakeSingleThreadTaskRunner> task_runner_;
    101   scoped_ptr<AudioSender> audio_sender_;
    102   scoped_refptr<CastEnvironment> cast_environment_;
    103   AudioSenderConfig audio_config_;
    104 };
    105 
    106 TEST_F(AudioSenderTest, Encode20ms) {
    107   const base::TimeDelta kDuration = base::TimeDelta::FromMilliseconds(20);
    108   scoped_ptr<AudioBus> bus(
    109       TestAudioBusFactory(audio_config_.channels,
    110                           audio_config_.frequency,
    111                           TestAudioBusFactory::kMiddleANoteFreq,
    112                           0.5f).NextAudioBus(kDuration));
    113 
    114   audio_sender_->InsertAudio(bus.Pass(), testing_clock_->NowTicks());
    115   task_runner_->RunTasks();
    116   EXPECT_LE(1, transport_.number_of_rtp_packets());
    117   EXPECT_LE(1, transport_.number_of_rtcp_packets());
    118 }
    119 
    120 TEST_F(AudioSenderTest, RtcpTimer) {
    121   const base::TimeDelta kDuration = base::TimeDelta::FromMilliseconds(20);
    122   scoped_ptr<AudioBus> bus(
    123       TestAudioBusFactory(audio_config_.channels,
    124                           audio_config_.frequency,
    125                           TestAudioBusFactory::kMiddleANoteFreq,
    126                           0.5f).NextAudioBus(kDuration));
    127 
    128   audio_sender_->InsertAudio(bus.Pass(), testing_clock_->NowTicks());
    129   task_runner_->RunTasks();
    130 
    131   // Make sure that we send at least one RTCP packet.
    132   base::TimeDelta max_rtcp_timeout =
    133       base::TimeDelta::FromMilliseconds(1 + kDefaultRtcpIntervalMs * 3 / 2);
    134   testing_clock_->Advance(max_rtcp_timeout);
    135   task_runner_->RunTasks();
    136   EXPECT_LE(1, transport_.number_of_rtp_packets());
    137   EXPECT_LE(1, transport_.number_of_rtcp_packets());
    138 }
    139 
    140 }  // namespace cast
    141 }  // namespace media
    142