Refactor MSE implementation on Android to simplify the logic and improve the performance

media/base/android/media_source_player_unittest.cc

 // Copyright 2013 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 <string>
 
 #include "base/basictypes.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/strings/stringprintf.h"
+#include "media/base/android/audio_decoder_job.h"
 #include "media/base/android/media_codec_bridge.h"
 #include "media/base/android/media_drm_bridge.h"
 #include "media/base/android/media_player_manager.h"
 #include "media/base/android/media_source_player.h"
+#include "media/base/android/video_decoder_job.h"
 #include "media/base/bind_to_current_loop.h"
 #include "media/base/decoder_buffer.h"
 #include "media/base/test_data_util.h"
 #include "testing/gmock/include/gmock/gmock.h"
 #include "ui/gl/android/surface_texture.h"
 
 namespace media {
 
 // Helper macro to skip the test if MediaCodecBridge isn't available.
 #define SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE()        \
@@ skipping 103 matching lines @@
 
   DISALLOW_COPY_AND_ASSIGN(MockMediaPlayerManager);
 };
 
 class MockDemuxerAndroid : public DemuxerAndroid {
  public:
   explicit MockDemuxerAndroid(base::MessageLoop* message_loop)
       : message_loop_(message_loop),
         num_data_requests_(0),
         num_seek_requests_(0),
-        num_browser_seek_requests_(0),
-        num_config_requests_(0) {}
+        num_browser_seek_requests_(0) {}
   virtual ~MockDemuxerAndroid() {}
 
   virtual void Initialize(DemuxerAndroidClient* client) OVERRIDE {}
-  virtual void RequestDemuxerConfigs() OVERRIDE {
-    num_config_requests_++;
-  }
   virtual void RequestDemuxerData(DemuxerStream::Type type) OVERRIDE {
     num_data_requests_++;
     if (message_loop_->is_running())
       message_loop_->Quit();
   }
   virtual void RequestDemuxerSeek(const base::TimeDelta& time_to_seek,
                                   bool is_browser_seek) OVERRIDE {
     num_seek_requests_++;
     if (is_browser_seek)
       num_browser_seek_requests_++;
   }
 
   int num_data_requests() const { return num_data_requests_; }
   int num_seek_requests() const { return num_seek_requests_; }
   int num_browser_seek_requests() const { return num_browser_seek_requests_; }
-  int num_config_requests() const { return num_config_requests_; }
 
  private:
   base::MessageLoop* message_loop_;
 
   // The number of encoded data requests this object has seen.
   int num_data_requests_;
 
   // The number of regular and browser seek requests this object has seen.
   int num_seek_requests_;
 
   // The number of browser seek requests this object has seen.
   int num_browser_seek_requests_;
 
-  // The number of demuxer config requests this object has seen.
-  int num_config_requests_;
-
   DISALLOW_COPY_AND_ASSIGN(MockDemuxerAndroid);
 };
 
 class MediaSourcePlayerTest : public testing::Test {
  public:
   MediaSourcePlayerTest()
       : manager_(&message_loop_),
         demuxer_(new MockDemuxerAndroid(&message_loop_)),
         player_(0, &manager_,
                 base::Bind(&MockMediaPlayerManager::OnMediaResourcesRequested,
                            base::Unretained(&manager_)),
                 base::Bind(&MockMediaPlayerManager::OnMediaResourcesReleased,
                            base::Unretained(&manager_)),
                 scoped_ptr<DemuxerAndroid>(demuxer_)),
         decoder_callback_hook_executed_(false),
         surface_texture_a_is_next_(true) {}
   virtual ~MediaSourcePlayerTest() {}
 
  protected:
   // Get the decoder job from the MediaSourcePlayer.
   MediaDecoderJob* GetMediaDecoderJob(bool is_audio) {
     if (is_audio) {
       return reinterpret_cast<MediaDecoderJob*>(
           player_.audio_decoder_job_.get());
     }
     return reinterpret_cast<MediaDecoderJob*>(
         player_.video_decoder_job_.get());
   }
 
+  // Get the MediaCodecBridge from the decoder job.
+  MediaCodecBridge* GetMediaCodecBridge(bool is_audio) {
+    if (is_audio)
+      return player_.audio_decoder_job_->media_codec_bridge_.get();
+    return player_.video_decoder_job_->media_codec_bridge_.get();
+  }
+
   // Get the per-job prerolling status from the MediaSourcePlayer's job matching
   // |is_audio|. Caller must guard against NPE if the player's job is NULL.
   bool IsPrerolling(bool is_audio) {
-    return GetMediaDecoderJob(is_audio)->prerolling();
+    return GetMediaDecoderJob(is_audio)->prerolling_;
   }
 
   // Get the preroll timestamp from the MediaSourcePlayer.
   base::TimeDelta GetPrerollTimestamp() {
     return player_.preroll_timestamp_;
   }
 
   // Simulate player has reached starvation timeout.
   void TriggerPlayerStarvation() {
     player_.decoder_starvation_callback_.Cancel();
     player_.OnDecoderStarved();
   }
 
   // Release() the player.
   void ReleasePlayer() {
     EXPECT_TRUE(player_.IsPlaying());
     player_.Release();
     EXPECT_FALSE(player_.IsPlaying());
-    EXPECT_FALSE(GetMediaDecoderJob(true));
-    EXPECT_FALSE(GetMediaDecoderJob(false));
   }
 
   // Upon the next successful decode callback, post a task to call Release()
   // on the |player_|. TEST_F's do not have access to the private player
   // members, hence this helper method.
   // Prevent usage creep of MSP::set_decode_callback_for_testing() by
   // only using it for the ReleaseWithOnPrefetchDoneAlreadyPosted test.
   void OnNextTestDecodeCallbackPostTaskToReleasePlayer() {
     DCHECK_EQ(&message_loop_, base::MessageLoop::current());
     player_.set_decode_callback_for_testing(media::BindToCurrentLoop(
       base::Bind(
           &MediaSourcePlayerTest::ReleaseWithPendingPrefetchDoneVerification,
           base::Unretained(this))));
   }
 
   // Asynch test callback posted upon decode completion to verify that a pending
-  // prefetch done event is cleared across |player_|'s Release(). This helps
+  // prefetch done event is not cleared across |player_|'s Release(). This helps
   // ensure the ReleaseWithOnPrefetchDoneAlreadyPosted test scenario is met.
   void ReleaseWithPendingPrefetchDoneVerification() {
     EXPECT_TRUE(player_.IsEventPending(player_.PREFETCH_DONE_EVENT_PENDING));
     ReleasePlayer();
-    EXPECT_FALSE(player_.IsEventPending(player_.PREFETCH_DONE_EVENT_PENDING));
+    EXPECT_TRUE(player_.IsEventPending(player_.PREFETCH_DONE_EVENT_PENDING));
     EXPECT_FALSE(decoder_callback_hook_executed_);
+    EXPECT_FALSE(GetMediaCodecBridge(true));
     decoder_callback_hook_executed_ = true;
   }
 
-  // Inspect internal pending_event_ state of |player_|. This is for infrequent
-  // use by tests, only where required.
-  bool IsPendingSurfaceChange() {
-    return player_.IsEventPending(player_.SURFACE_CHANGE_EVENT_PENDING);
-  }
-
   DemuxerConfigs CreateAudioDemuxerConfigs(AudioCodec audio_codec) {
     DemuxerConfigs configs;
     configs.audio_codec = audio_codec;
     configs.audio_channels = 2;
     configs.is_audio_encrypted = false;
     configs.duration = kDefaultDuration;
 
     if (audio_codec == kCodecVorbis) {
       configs.audio_sampling_rate = 44100;
       scoped_refptr<DecoderBuffer> buffer = ReadTestDataFile(
           "vorbis-extradata");
       configs.audio_extra_data = std::vector<uint8>(
           buffer->data(),
           buffer->data() + buffer->data_size());
       return configs;
     }
 
     // Other codecs are not yet supported by this helper.
     EXPECT_EQ(audio_codec, kCodecAAC);
 
     configs.audio_sampling_rate = 48000;
     uint8 aac_extra_data[] = { 0x13, 0x10 };
     configs.audio_extra_data = std::vector<uint8>(
         aac_extra_data,
         aac_extra_data + 2);
     return configs;
   }
 
-  DemuxerConfigs CreateVideoDemuxerConfigs() {
+  DemuxerConfigs CreateVideoDemuxerConfigs(VideoCodec video_codec) {
     DemuxerConfigs configs;
-    configs.video_codec = kCodecVP8;
+    configs.video_codec = video_codec;
     configs.video_size = gfx::Size(320, 240);
     configs.is_video_encrypted = false;
     configs.duration = kDefaultDuration;
     return configs;
   }
 
   DemuxerConfigs CreateAudioVideoDemuxerConfigs() {
     DemuxerConfigs configs = CreateAudioDemuxerConfigs(kCodecVorbis);
     configs.video_codec = kCodecVP8;
     configs.video_size = gfx::Size(320, 240);
     configs.is_video_encrypted = false;
     return configs;
   }
 
   DemuxerConfigs CreateDemuxerConfigs(bool have_audio, bool have_video) {
     DCHECK(have_audio || have_video);
 
     if (have_audio && !have_video)
       return CreateAudioDemuxerConfigs(kCodecVorbis);
 
     if (have_video && !have_audio)
-      return CreateVideoDemuxerConfigs();
+      return CreateVideoDemuxerConfigs(kCodecVP8);
 
     return CreateAudioVideoDemuxerConfigs();
   }
 
   // Starts an audio decoder job. Verifies player behavior relative to
   // |expect_player_requests_data|.
   void StartAudioDecoderJob(bool expect_player_requests_data) {
     Start(CreateAudioDemuxerConfigs(kCodecVorbis), expect_player_requests_data);
   }
 
   // Starts a video decoder job. Verifies player behavior relative to
   // |expect_player_requests_data|.
   void StartVideoDecoderJob(bool expect_player_requests_data) {
-    Start(CreateVideoDemuxerConfigs(), expect_player_requests_data);
+    Start(CreateVideoDemuxerConfigs(kCodecVP8), expect_player_requests_data);
   }
 
   // Starts decoding the data. Verifies player behavior relative to
   // |expect_player_requests_data|.
   void Start(const DemuxerConfigs& configs, bool expect_player_requests_data) {
     bool has_audio = configs.audio_codec != kUnknownAudioCodec;
     bool has_video = configs.video_codec != kUnknownVideoCodec;
     int original_num_data_requests = demuxer_->num_data_requests();
     int expected_request_delta = expect_player_requests_data ?
         ((has_audio ? 1 : 0) + (has_video ? 1 : 0)) : 0;
 
     player_.OnDemuxerConfigsAvailable(configs);
     player_.Start();
 
     EXPECT_TRUE(player_.IsPlaying());
     EXPECT_EQ(original_num_data_requests + expected_request_delta,
               demuxer_->num_data_requests());
-
-    // Verify player has decoder job iff the config included the media type for
-    // the job and the player is expected to request data due to Start(), above.
-    EXPECT_EQ(expect_player_requests_data && has_audio,
-              GetMediaDecoderJob(true) != NULL);
-    EXPECT_EQ(expect_player_requests_data && has_video,
-              GetMediaDecoderJob(false) != NULL);
   }
 
   // Keeps decoding audio data until the decoder starts to output samples.
   // Gives up if no audio output after decoding 10 frames.
   void DecodeAudioDataUntilOutputBecomesAvailable() {
     EXPECT_TRUE(player_.IsPlaying());
     base::TimeDelta current_time = player_.GetCurrentTime();
     base::TimeDelta start_timestamp = current_time;
     for (int i = 0; i < 10; ++i) {
       manager_.ResetTimestampUpdated();
@@ skipping 67 matching lines @@
   }
 
   // Helper method for use at test start. It starts an audio decoder job and
   // immediately feeds it some data to decode. Then, without letting the decoder
   // job complete a decode cycle, it also starts player SeekTo(). Upon return,
   // the player should not yet have sent the DemuxerSeek IPC request, though
   // seek event should be pending. The audio decoder job will also still be
   // decoding.
   void StartAudioDecoderJobAndSeekToWhileDecoding(
       const base::TimeDelta& seek_time) {
-    EXPECT_FALSE(GetMediaDecoderJob(true));
+    EXPECT_FALSE(GetMediaCodecBridge(true));
     EXPECT_FALSE(player_.IsPlaying());
     EXPECT_EQ(0, demuxer_->num_data_requests());
     EXPECT_EQ(0.0, GetPrerollTimestamp().InMillisecondsF());
     EXPECT_EQ(player_.GetCurrentTime(), GetPrerollTimestamp());
     StartAudioDecoderJob(true);
     EXPECT_FALSE(GetMediaDecoderJob(true)->is_decoding());
     player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
     EXPECT_EQ(2, demuxer_->num_data_requests());
     EXPECT_TRUE(GetMediaDecoderJob(true)->is_decoding());
     player_.SeekTo(seek_time);
@@ skipping 16 matching lines @@
     player_.SeekTo(seek_time);
 
     // Verify that the seek does not occur until previously outstanding data
     // request is satisfied.
     EXPECT_EQ(original_num_seeks, demuxer_->num_seek_requests());
 
     // Simulate seeking causes the demuxer to abort the outstanding read
     // caused by the seek.
     player_.OnDemuxerDataAvailable(CreateAbortedAck(is_audio));
 
+    // Wait for the decode job to finish so we can process the seek request.
+    WaitForDecodeDone(is_audio, !is_audio);
+
     // Verify that the seek is requested.
     EXPECT_EQ(original_num_seeks + 1, demuxer_->num_seek_requests());
 
     // Send back the seek done notification. This should trigger the player to
     // call OnReadFromDemuxer() again.
     EXPECT_EQ(original_num_data_requests, demuxer_->num_data_requests());
     player_.OnDemuxerSeekDone(kNoTimestamp());
     EXPECT_EQ(original_num_data_requests + 1, demuxer_->num_data_requests());
 
     // No other seek should have been requested.
@@ skipping 24 matching lines @@
           base::TimeDelta::FromMilliseconds(current_timestamp);
       player_.OnDemuxerDataAvailable(data);
       EXPECT_TRUE(GetMediaDecoderJob(is_audio)->is_decoding());
       EXPECT_EQ(target_timestamp, player_.GetCurrentTime());
       current_timestamp += 30;
       WaitForDecodeDone(is_audio, !is_audio);
     }
     EXPECT_LE(target_timestamp, player_.GetCurrentTime());
   }
 
-  DemuxerData CreateReadFromDemuxerAckWithConfigChanged(bool is_audio,
-                                                        int config_unit_index) {
+  DemuxerData CreateReadFromDemuxerAckWithConfigChanged(
+      bool is_audio,
+      int config_unit_index,
+      const DemuxerConfigs& configs) {
     DemuxerData data;
     data.type = is_audio ? DemuxerStream::AUDIO : DemuxerStream::VIDEO;
     data.access_units.resize(config_unit_index + 1);
 
     for (int i = 0; i < config_unit_index; ++i)
       data.access_units[i] = CreateAccessUnitWithData(is_audio, i);
 
     data.access_units[config_unit_index].status = DemuxerStream::kConfigChanged;
+    data.demuxer_configs.resize(1);
+    data.demuxer_configs[0] = configs;
     return data;
   }
 
   // Valid only for video-only player tests. If |trigger_with_release_start| is
   // true, triggers the browser seek with a Release() + video data received +
   // Start() with a new surface. If false, triggers the browser seek by
   // setting a new video surface after beginning decode of received video data.
   // Such data receipt causes possibility that an I-frame is not next, and
   // browser seek results once decode completes and surface change processing
   // begins.
   void BrowserSeekPlayer(bool trigger_with_release_start) {
-    int expected_num_data_requests = demuxer_->num_data_requests() +
-        (trigger_with_release_start ? 1 : 2);
+    int expected_num_data_requests = demuxer_->num_data_requests() + 2;
     int expected_num_seek_requests = demuxer_->num_seek_requests();
     int expected_num_browser_seek_requests =
         demuxer_->num_browser_seek_requests();
 
-    EXPECT_FALSE(GetMediaDecoderJob(false));
     CreateNextTextureAndSetVideoSurface();
     StartVideoDecoderJob(true);
 
     if (trigger_with_release_start) {
+      // Consume the first frame, so that the next VideoDecoderJob will not
+      // inherit the I-frame from the previous decoder.
+      player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
       ReleasePlayer();
+      WaitForVideoDecodeDone();
 
       // Simulate demuxer's response to the video data request. The data will be
-      // discarded.
+      // passed to the next MediaCodecBridge.
       player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
-      EXPECT_FALSE(GetMediaDecoderJob(false));
+      EXPECT_FALSE(GetMediaCodecBridge(false));
       EXPECT_FALSE(player_.IsPlaying());
       EXPECT_EQ(expected_num_seek_requests, demuxer_->num_seek_requests());
 
       CreateNextTextureAndSetVideoSurface();
       StartVideoDecoderJob(false);
-      EXPECT_FALSE(GetMediaDecoderJob(false));
+      EXPECT_FALSE(GetMediaCodecBridge(false));
+
+      // Run the message loop so that prefetch will complete.
+      while (expected_num_seek_requests == demuxer_->num_seek_requests())
+        message_loop_.RunUntilIdle();
     } else {
       // Simulate demuxer's response to the video data request.
       player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
       // While the decoder is decoding, trigger a browser seek by changing
       // surface. Demuxer does not know of browser seek in advance, so no
       // |kAborted| data is required (though |kAborted| can certainly occur for
       // any pending read in reality due to renderer preparing for a regular
       // seek).
       CreateNextTextureAndSetVideoSurface();
 
       // Browser seek should not begin until decoding has completed.
-      EXPECT_TRUE(GetMediaDecoderJob(false));
+      EXPECT_TRUE(GetMediaCodecBridge(false));
       EXPECT_EQ(expected_num_seek_requests, demuxer_->num_seek_requests());
 
       // Wait for the decoder job to finish decoding and be reset pending the
       // browser seek.
       WaitForVideoDecodeDone();
       player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
     }
 
     // Only one browser seek should have been initiated, and no further data
     // should have been requested.
     expected_num_seek_requests++;
     expected_num_browser_seek_requests++;
     EXPECT_EQ(expected_num_seek_requests, demuxer_->num_seek_requests());
     EXPECT_EQ(expected_num_browser_seek_requests,
               demuxer_->num_browser_seek_requests());
     EXPECT_EQ(expected_num_data_requests, demuxer_->num_data_requests());
   }
 
   // Creates a new decoder job and feeds it data ending with a |kConfigChanged|
   // access unit. If |config_unit_in_prefetch| is true, sends feeds the config
   // change AU in response to the job's first read request (prefetch). If
   // false, regular data is fed and decoded prior to feeding the config change
   // AU in response to the second data request (after prefetch completed).
   // |config_unit_index| controls which access unit is |kConfigChanged|.
-  void StartConfigChange(bool is_audio,
-                         bool config_unit_in_prefetch,
-                         int config_unit_index) {
-    int expected_num_config_requests = demuxer_->num_config_requests();
-
-    EXPECT_FALSE(GetMediaDecoderJob(is_audio));
+  void SendConfigChangeToDecoder(bool is_audio,
+                                 bool config_unit_in_prefetch,
+                                 int config_unit_index) {
+    EXPECT_FALSE(GetMediaCodecBridge(is_audio));
     if (is_audio) {
       StartAudioDecoderJob(true);
     } else {
       CreateNextTextureAndSetVideoSurface();
       StartVideoDecoderJob(true);
     }
 
     int expected_num_data_requests = demuxer_->num_data_requests();
-
     // Feed and decode a standalone access unit so the player exits prefetch.
     if (!config_unit_in_prefetch) {
       if (is_audio)
         player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
       else
         player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
       WaitForDecodeDone(is_audio, !is_audio);
 
       // We should have completed the prefetch phase at this point.
       expected_num_data_requests++;
       EXPECT_EQ(expected_num_data_requests, demuxer_->num_data_requests());
     }
 
-    EXPECT_EQ(expected_num_config_requests, demuxer_->num_config_requests());
-
+    DemuxerConfigs configs = is_audio ? CreateAudioDemuxerConfigs(kCodecAAC) :
+        CreateVideoDemuxerConfigs(kCodecVP9);
     // Feed and decode access units with data for any units prior to
     // |config_unit_index|, and a |kConfigChanged| unit at that index.
     // Player should prepare to reconfigure the decoder job, and should request
     // new demuxer configs.
-    player_.OnDemuxerDataAvailable(
-        CreateReadFromDemuxerAckWithConfigChanged(is_audio, config_unit_index));
-    WaitForDecodeDone(is_audio, !is_audio);
+    player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckWithConfigChanged(
+        is_audio, config_unit_index, configs));
 
-    expected_num_config_requests++;
+    expected_num_data_requests++;
     EXPECT_EQ(expected_num_data_requests, demuxer_->num_data_requests());
-    EXPECT_EQ(expected_num_config_requests, demuxer_->num_config_requests());
+    if (is_audio)
+      player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
+    else
+      player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  }
+
+  // Send a config change to the decoder job and drain the decoder so that the
+  // config change is processed.
+  void StartConfigChange(bool is_audio,
+                         bool config_unit_in_prefetch,
+                         int config_unit_index) {
+    SendConfigChangeToDecoder(is_audio, config_unit_in_prefetch,
+                              config_unit_index);
+    int expected_num_data_requests = demuxer_->num_data_requests();
+    // Run until decoder starts to request new data.
+    while (demuxer_->num_data_requests() == expected_num_data_requests)
+      message_loop_.RunUntilIdle();
   }
 
   void CreateNextTextureAndSetVideoSurface() {
     gfx::SurfaceTexture* surface_texture;
     if (surface_texture_a_is_next_) {
       surface_texture_a_ = gfx::SurfaceTexture::Create(next_texture_id_++);
       surface_texture = surface_texture_a_.get();
     } else {
       surface_texture_b_ = gfx::SurfaceTexture::Create(next_texture_id_++);
       surface_texture = surface_texture_b_.get();
     }
 
     surface_texture_a_is_next_ = !surface_texture_a_is_next_;
     gfx::ScopedJavaSurface surface = gfx::ScopedJavaSurface(surface_texture);
     player_.SetVideoSurface(surface.Pass());
   }
 
   // Wait for one or both of the jobs to complete decoding. Decoder jobs are
   // assumed to exist for any stream whose decode completion is awaited.
   void WaitForDecodeDone(bool wait_for_audio, bool wait_for_video) {
     DCHECK(wait_for_audio || wait_for_video);
-    while ((wait_for_audio && GetMediaDecoderJob(true) &&
+    while ((wait_for_audio && GetMediaCodecBridge(true) &&
                GetMediaDecoderJob(true)->HasData() &&
                GetMediaDecoderJob(true)->is_decoding()) ||
-           (wait_for_video && GetMediaDecoderJob(false) &&
+           (wait_for_video && GetMediaCodecBridge(false) &&
                GetMediaDecoderJob(false)->HasData() &&
                GetMediaDecoderJob(false)->is_decoding())) {
       message_loop_.RunUntilIdle();
     }
   }
 
   void WaitForAudioDecodeDone() {
     WaitForDecodeDone(true, false);
   }
 
@@ skipping 82 matching lines @@
     EXPECT_EQ(1, demuxer_->num_seek_requests());
 
     player_.OnDemuxerSeekDone(kNoTimestamp());
     EXPECT_FALSE(manager_.playback_completed());
   }
 
   base::TimeTicks StartTimeTicks() {
     return player_.start_time_ticks_;
   }
 
+  bool IsRequestingDemuxerData(bool is_audio) {
+    return GetMediaDecoderJob(is_audio)->is_requesting_demuxer_data_;
+  }
+
+  bool IsDrainingDecoder(bool is_audio) {
+    return GetMediaDecoderJob(is_audio)->drain_decoder_;
+  }
+
   base::MessageLoop message_loop_;
   MockMediaPlayerManager manager_;
   MockDemuxerAndroid* demuxer_;  // Owned by |player_|.
   MediaSourcePlayer player_;
 
   // Track whether a possibly async decoder callback test hook has run.
   bool decoder_callback_hook_executed_;
 
   // We need to keep the surface texture while the decoder is actively decoding.
   // Otherwise, it may trigger unexpected crashes on some devices. To switch
@@ skipping 21 matching lines @@
 TEST_F(MediaSourcePlayerTest, StartAudioDecoderWithInvalidConfig) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test audio decoder job will not be created when failed to start the codec.
   DemuxerConfigs configs = CreateAudioDemuxerConfigs(kCodecVorbis);
   // Replace with invalid |audio_extra_data|
   configs.audio_extra_data.clear();
   uint8 invalid_codec_data[] = { 0x00, 0xff, 0xff, 0xff, 0xff };
   configs.audio_extra_data.insert(configs.audio_extra_data.begin(),
                                  invalid_codec_data, invalid_codec_data + 4);
-  Start(configs, false);
+  // Prefetch() should happen before the decoder is created, so we should always
+  // see data requests.
+  Start(configs, true);
   EXPECT_EQ(0, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, StartVideoCodecWithValidSurface) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
-  // Test video decoder job will be created when surface is valid.
-  // Video decoder job will not be created until surface is available.
-  StartVideoDecoderJob(false);
+  // Test video decoder job will not be created until data is received.
+  StartVideoDecoderJob(true);
 
   // Set both an initial and a later video surface without receiving any
   // demuxed data yet.
   CreateNextTextureAndSetVideoSurface();
-  MediaDecoderJob* first_job = GetMediaDecoderJob(false);
-  EXPECT_TRUE(first_job);
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   CreateNextTextureAndSetVideoSurface();
-
-  // Setting another surface will not create a new job until any pending
-  // read is satisfied (and job is no longer decoding).
-  EXPECT_EQ(first_job, GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
 
   // No seeks, even on setting surface, should have occurred. (Browser seeks can
   // occur on setting surface, but only after previously receiving video data.)
   EXPECT_EQ(0, demuxer_->num_seek_requests());
 
-  // Note, the decoder job for the second surface set, above, will be created
-  // only after the pending read is satisfied and decoded, and the resulting
-  // browser seek is done. See BrowserSeek_* tests for this coverage.
+  // Send the first input chunk and verify that decoder will be created.
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, StartVideoCodecWithInvalidSurface) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test video decoder job will not be created when surface is invalid.
   scoped_refptr<gfx::SurfaceTexture> surface_texture(
       gfx::SurfaceTexture::Create(0));
   gfx::ScopedJavaSurface surface(surface_texture.get());
-  StartVideoDecoderJob(false);
+  StartVideoDecoderJob(true);
 
   // Release the surface texture.
   surface_texture = NULL;
   player_.SetVideoSurface(surface.Pass());
 
   // Player should not seek the demuxer on setting initial surface.
   EXPECT_EQ(0, demuxer_->num_seek_requests());
-
-  EXPECT_FALSE(GetMediaDecoderJob(false));
-  EXPECT_EQ(0, demuxer_->num_data_requests());
+  EXPECT_FALSE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, ReadFromDemuxerAfterSeek) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test decoder job will resend a ReadFromDemuxer request after seek.
   StartAudioDecoderJob(true);
   SeekPlayerWithAbort(true, base::TimeDelta());
 }
 
 TEST_F(MediaSourcePlayerTest, SetSurfaceWhileSeeking) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test SetVideoSurface() will not cause an extra seek while the player is
   // waiting for demuxer to indicate seek is done.
-  // Player is still waiting for SetVideoSurface(), so no request is sent.
-  StartVideoDecoderJob(false);  // Verifies no data requested.
+  player_.OnDemuxerConfigsAvailable(CreateVideoDemuxerConfigs(kCodecVP8));
 
   // Initiate a seek. Skip requesting element seek of renderer.
   // Instead behave as if the renderer has asked us to seek.
-  EXPECT_EQ(0, demuxer_->num_seek_requests());
   player_.SeekTo(base::TimeDelta());
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   CreateNextTextureAndSetVideoSurface();
-  EXPECT_FALSE(GetMediaDecoderJob(false));
   EXPECT_EQ(1, demuxer_->num_seek_requests());
-
-  // Reconfirm player has not yet requested data.
-  EXPECT_EQ(0, demuxer_->num_data_requests());
+  player_.Start();
 
   // Send the seek done notification. The player should start requesting data.
   player_.OnDemuxerSeekDone(kNoTimestamp());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(1, demuxer_->num_data_requests());
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
 
   // Reconfirm exactly 1 seek request has been made of demuxer, and that it
   // was not a browser seek request.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
   EXPECT_EQ(0, demuxer_->num_browser_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, ChangeMultipleSurfaceWhileDecoding) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test MediaSourcePlayer can switch multiple surfaces during decoding.
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
   EXPECT_EQ(0, demuxer_->num_seek_requests());
 
   // Send the first input chunk.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
   // While the decoder is decoding, change multiple surfaces. Pass an empty
   // surface first.
   gfx::ScopedJavaSurface empty_surface;
   player_.SetVideoSurface(empty_surface.Pass());
   // Next, pass a new non-empty surface.
   CreateNextTextureAndSetVideoSurface();
 
   // Wait for the decoder job to finish decoding and be reset pending a browser
   // seek.
   WaitForVideoDecodeDone();
-  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  player_.OnDemuxerDataAvailable(CreateAbortedAck(false));
 
   // Only one browser seek should have been initiated. No further data request
   // should have been processed on |message_loop_| before surface change event
   // became pending, above.
   EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
   EXPECT_EQ(2, demuxer_->num_data_requests());
 
   // Simulate browser seek is done and confirm player requests more data for new
   // video decoder job.
   player_.OnDemuxerSeekDone(player_.GetCurrentTime());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(3, demuxer_->num_data_requests());
   EXPECT_EQ(1, demuxer_->num_seek_requests());
+
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, SetEmptySurfaceAndStarveWhileDecoding) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test player pauses if an empty surface is passed.
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
   EXPECT_EQ(1, demuxer_->num_data_requests());
 
   // Send the first input chunk.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
   // While the decoder is decoding, pass an empty surface.
   gfx::ScopedJavaSurface empty_surface;
   player_.SetVideoSurface(empty_surface.Pass());
   // Let the player starve. However, it should not issue any new data request in
   // this case.
   TriggerPlayerStarvation();
   // Wait for the decoder job to finish decoding and be reset.
-  while (GetMediaDecoderJob(false))
+  while (GetMediaDecoderJob(false)->is_decoding())
     message_loop_.RunUntilIdle();
 
   // No further seek or data requests should have been received since the
   // surface is empty.
   EXPECT_EQ(0, demuxer_->num_browser_seek_requests());
   EXPECT_EQ(2, demuxer_->num_data_requests());
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
   // Playback resumes once a non-empty surface is passed.
   CreateNextTextureAndSetVideoSurface();
   EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, ReleaseVideoDecoderResourcesWhileDecoding) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that if video decoder is released while decoding, the resources will
   // not be immediately released.
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
-  EXPECT_EQ(1, manager_.num_resources_requested());
+  // No resource is requested since there is no data to decode.
+  EXPECT_EQ(0, manager_.num_resources_requested());
   ReleasePlayer();
-  // The resources will be immediately released since the decoder is idle.
-  EXPECT_EQ(1, manager_.num_resources_released());
+  EXPECT_EQ(0, manager_.num_resources_released());
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
 
   // Recreate the video decoder.
   CreateNextTextureAndSetVideoSurface();
   player_.Start();
-  EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
-  player_.OnDemuxerSeekDone(base::TimeDelta());
-  EXPECT_EQ(2, manager_.num_resources_requested());
-  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  while (!GetMediaDecoderJob(false)->is_decoding())
+    message_loop_.RunUntilIdle();
+  EXPECT_EQ(0, demuxer_->num_browser_seek_requests());
+  EXPECT_EQ(1, manager_.num_resources_requested());
   ReleasePlayer();
   // The resource is still held by the video decoder until it finishes decoding.
-  EXPECT_EQ(1, manager_.num_resources_released());
+  EXPECT_EQ(0, manager_.num_resources_released());
   // Wait for the decoder job to finish decoding and be reset.
-  while (manager_.num_resources_released() != 2)
+  while (manager_.num_resources_released() != 1)
     message_loop_.RunUntilIdle();
 }
 
 TEST_F(MediaSourcePlayerTest, AudioOnlyStartAfterSeekFinish) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test audio decoder job will not start until pending seek event is handled.
   DemuxerConfigs configs = CreateAudioDemuxerConfigs(kCodecVorbis);
   player_.OnDemuxerConfigsAvailable(configs);
-  EXPECT_FALSE(GetMediaDecoderJob(true));
 
   // Initiate a seek. Skip requesting element seek of renderer.
   // Instead behave as if the renderer has asked us to seek.
   player_.SeekTo(base::TimeDelta());
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   player_.Start();
-  EXPECT_FALSE(GetMediaDecoderJob(true));
   EXPECT_EQ(0, demuxer_->num_data_requests());
 
   // Sending back the seek done notification.
   player_.OnDemuxerSeekDone(kNoTimestamp());
-  EXPECT_TRUE(GetMediaDecoderJob(true));
+  EXPECT_FALSE(GetMediaCodecBridge(true));
   EXPECT_EQ(1, demuxer_->num_data_requests());
 
   // Reconfirm exactly 1 seek request has been made of demuxer.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
+
+  // Decoder is created after data is received.
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
+  EXPECT_TRUE(GetMediaCodecBridge(true));
 }
 
 TEST_F(MediaSourcePlayerTest, VideoOnlyStartAfterSeekFinish) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test video decoder job will not start until pending seek event is handled.
   CreateNextTextureAndSetVideoSurface();
-  DemuxerConfigs configs = CreateVideoDemuxerConfigs();
+  DemuxerConfigs configs = CreateVideoDemuxerConfigs(kCodecVP8);
   player_.OnDemuxerConfigsAvailable(configs);
-  EXPECT_FALSE(GetMediaDecoderJob(false));
 
   // Initiate a seek. Skip requesting element seek of renderer.
   // Instead behave as if the renderer has asked us to seek.
   player_.SeekTo(base::TimeDelta());
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   player_.Start();
-  EXPECT_FALSE(GetMediaDecoderJob(false));
   EXPECT_EQ(0, demuxer_->num_data_requests());
 
   // Sending back the seek done notification.
   player_.OnDemuxerSeekDone(kNoTimestamp());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(1, demuxer_->num_data_requests());
 
   // Reconfirm exactly 1 seek request has been made of demuxer.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
+
+  // Decoder is created after data is received.
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, StartImmediatelyAfterPause) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that if the decoding job is not fully stopped after Pause(),
   // calling Start() will be a noop.
   StartAudioDecoderJob(true);
 
   MediaDecoderJob* decoder_job = GetMediaDecoderJob(true);
@@ skipping 11 matching lines @@
 
   // Nothing happens when calling Start() again.
   player_.Start();
   // Verify that Start() will not destroy and recreate the decoder job.
   EXPECT_EQ(decoder_job, GetMediaDecoderJob(true));
 
   while (GetMediaDecoderJob(true)->is_decoding())
     message_loop_.RunUntilIdle();
   // The decoder job should finish and wait for data.
   EXPECT_EQ(2, demuxer_->num_data_requests());
-  EXPECT_TRUE(GetMediaDecoderJob(true)->is_requesting_demuxer_data());
+  EXPECT_TRUE(IsRequestingDemuxerData(true));
 }
 
 TEST_F(MediaSourcePlayerTest, DecoderJobsCannotStartWithoutAudio) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that when Start() is called, video decoder jobs will wait for audio
   // decoder job before start decoding the data.
   CreateNextTextureAndSetVideoSurface();
   Start(CreateAudioVideoDemuxerConfigs(), true);
   MediaDecoderJob* audio_decoder_job = GetMediaDecoderJob(true);
@@ skipping 23 matching lines @@
 
   DecodeAudioDataUntilOutputBecomesAvailable();
 
   // The decoder job should finish and a new request will be sent.
   base::TimeTicks previous = StartTimeTicks();
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(3));
 
   // Let the decoder starve.
   TriggerPlayerStarvation();
   WaitForAudioDecodeDone();
-
-  // Verify the start time ticks is cleared at this point because the
-  // player is prefetching.
-  EXPECT_TRUE(StartTimeTicks() == base::TimeTicks());
+  EXPECT_TRUE(StartTimeTicks() == previous);
 
   // Send new data to the decoder so it can finish prefetching. This should
   // reset the start time ticks.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(3));
-  EXPECT_TRUE(StartTimeTicks() != base::TimeTicks());
+  EXPECT_TRUE(StartTimeTicks() != previous);
 
   base::TimeTicks current = StartTimeTicks();
   EXPECT_LE(0, (current - previous).InMillisecondsF());
 }
 
 TEST_F(MediaSourcePlayerTest, V_SecondAccessUnitIsEOSAndResumePlayAfterSeek) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test MediaSourcePlayer can replay video after input EOS is reached.
   CreateNextTextureAndSetVideoSurface();
@@ skipping 46 matching lines @@
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that if one stream (audio) has completed decode of EOS and the other
   // stream (video) processes config change, that subsequent video EOS completes
   // A/V playback.
   // Also tests that seeking+Start() after completing playback resumes playback.
   CreateNextTextureAndSetVideoSurface();
   Start(CreateAudioVideoDemuxerConfigs(), true);
 
   player_.OnDemuxerDataAvailable(CreateEOSAck(true));  // Audio EOS
-  EXPECT_EQ(0, demuxer_->num_config_requests());
+  DemuxerConfigs configs = CreateVideoDemuxerConfigs(kCodecVP9);
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckWithConfigChanged(
-      false, 0));  // Video |kConfigChanged| as first unit.
+      false, 0, configs));  // Video |kConfigChanged| as first unit.
 
   WaitForAudioVideoDecodeDone();
 
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-  player_.OnDemuxerConfigsAvailable(CreateAudioVideoDemuxerConfigs());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   // At no time after completing audio EOS decode, above, should the
   // audio decoder job resume decoding. Send and decode video EOS.
   VerifyPlaybackCompletesOnEOSDecode(true, false);
   VerifyCompletedPlaybackResumesOnSeekPlusStart(true, true);
 }
 
 TEST_F(MediaSourcePlayerTest, VA_PlaybackCompletionAcrossConfigChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that if one stream (video) has completed decode of EOS and the other
   // stream (audio) processes config change, that subsequent audio EOS completes
   // A/V playback.
   // Also tests that seeking+Start() after completing playback resumes playback.
   CreateNextTextureAndSetVideoSurface();
   Start(CreateAudioVideoDemuxerConfigs(), true);
 
   player_.OnDemuxerDataAvailable(CreateEOSAck(false));  // Video EOS
-  EXPECT_EQ(0, demuxer_->num_config_requests());
+  // Audio |kConfigChanged| as first unit.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckWithConfigChanged(
-      true, 0));  // Audio |kConfigChanged| as first unit.
+      true, 0, CreateAudioDemuxerConfigs(kCodecVorbis)));
 
   WaitForAudioVideoDecodeDone();
 
-  // TODO(wolenetz/qinmin): Prevent redundant demuxer config request and change
-  // expectation to 1 here. See http://crbug.com/325528.
-  EXPECT_EQ(2, demuxer_->num_config_requests());
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-  player_.OnDemuxerConfigsAvailable(CreateAudioVideoDemuxerConfigs());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   // At no time after completing video EOS decode, above, should the
   // video decoder job resume decoding. Send and decode audio EOS.
   VerifyPlaybackCompletesOnEOSDecode(true, true);
   VerifyCompletedPlaybackResumesOnSeekPlusStart(true, true);
 }
 
 TEST_F(MediaSourcePlayerTest, AV_NoPrefetchForFinishedVideoOnAudioStarvation) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
@@ skipping 148 matching lines @@
 
 TEST_F(MediaSourcePlayerTest, BrowserSeek_RegularSeekPendsBrowserSeekDone) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that a browser seek, once started, delays a newly arrived regular
   // SeekTo() request's demuxer seek until the browser seek is done.
   BrowserSeekPlayer(false);
 
   // Simulate renderer requesting a regular seek while browser seek in progress.
   player_.SeekTo(base::TimeDelta());
-  EXPECT_FALSE(GetMediaDecoderJob(false));
 
   // Simulate browser seek is done. Confirm player requests the regular seek,
   // still has no video decoder job configured, and has not requested any
   // further data since the surface change event became pending in
   // BrowserSeekPlayer().
   EXPECT_EQ(1, demuxer_->num_seek_requests());
   player_.OnDemuxerSeekDone(base::TimeDelta());
-  EXPECT_FALSE(GetMediaDecoderJob(false));
   EXPECT_EQ(2, demuxer_->num_seek_requests());
   EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
 
   // Simulate regular seek is done and confirm player requests more data for
   // new video decoder job.
   player_.OnDemuxerSeekDone(kNoTimestamp());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(3, demuxer_->num_data_requests());
   EXPECT_EQ(2, demuxer_->num_seek_requests());
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, BrowserSeek_InitialReleaseAndStart) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that browser seek is requested if player Release() + Start() occurs
   // prior to receiving any data.
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
   ReleasePlayer();
 
   // Pass a new non-empty surface.
   CreateNextTextureAndSetVideoSurface();
 
   player_.Start();
 
-  // The new player won't be created until the pending data request is
-  // processed.
+  // No data request is issued since there is still one pending.
   EXPECT_EQ(1, demuxer_->num_data_requests());
-  EXPECT_FALSE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
 
-  // A browser seek should be requested.
+  // No browser seek is needed.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
-  EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
-  EXPECT_EQ(1, demuxer_->num_data_requests());
+  EXPECT_EQ(0, demuxer_->num_browser_seek_requests());
+  EXPECT_EQ(2, demuxer_->num_data_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, BrowserSeek_MidStreamReleaseAndStart) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that one browser seek is requested if player Release() + Start(), with
   // video data received between Release() and Start().
   BrowserSeekPlayer(true);
 
   // Simulate browser seek is done and confirm player requests more data.
   player_.OnDemuxerSeekDone(base::TimeDelta());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
-  EXPECT_EQ(2, demuxer_->num_data_requests());
+  EXPECT_EQ(3, demuxer_->num_data_requests());
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, PrerollAudioAfterSeek) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test decoder job will preroll the media to the seek position.
   StartAudioDecoderJob(true);
 
   SeekPlayerWithAbort(true, base::TimeDelta::FromMilliseconds(100));
@@ skipping 77 matching lines @@
       // While still prerolling, Release() and Start() the player.
       // TODO(qinmin): Simulation of multiple in-flight data requests (one from
       // before Release(), one from after Start()) is not included here, and
       // neither is any data enqueued for later decode if it arrives after
       // Release() and before Start(). See http://crbug.com/306314. Assumption
       // for this test, to prevent flakiness until the bug is fixed, is the
       // first request's data arrives before Start(). Though that data is not
       // seen by decoder, this assumption allows preroll continuation
       // verification and prevents multiple in-flight data requests.
       ReleasePlayer();
-      player_.OnDemuxerDataAvailable(data);
-      WaitForAudioDecodeDone();
-      EXPECT_FALSE(GetMediaDecoderJob(true));
-      StartAudioDecoderJob(true);
+      // The decoder is still decoding and will not be immediately released.
+      EXPECT_TRUE(GetMediaCodecBridge(true));
+      StartAudioDecoderJob(false);
     } else {
       player_.OnDemuxerDataAvailable(data);
       EXPECT_TRUE(GetMediaDecoderJob(true)->is_decoding());
       WaitForAudioDecodeDone();
     }
     EXPECT_TRUE(IsPrerolling(true));
   }
   EXPECT_EQ(100.0, player_.GetCurrentTime().InMillisecondsF());
   EXPECT_TRUE(IsPrerolling(true));
 
   // Send data after the seek position.
   PrerollDecoderToTime(true, target_timestamp, target_timestamp);
 }
 
 TEST_F(MediaSourcePlayerTest, PrerollContinuesAcrossConfigChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test decoder job will resume media prerolling if interrupted by
   // |kConfigChanged| and OnDemuxerConfigsAvailable().
   StartAudioDecoderJob(true);
 
   SeekPlayerWithAbort(true, base::TimeDelta::FromMilliseconds(100));
   EXPECT_TRUE(IsPrerolling(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
 
+  DemuxerConfigs configs = CreateAudioDemuxerConfigs(kCodecVorbis);
+  configs.audio_sampling_rate = 11025;
+
   // In response to data request, simulate that demuxer signals config change by
-  // sending an AU with |kConfigChanged|. Player should prepare to reconfigure
-  // the audio decoder job, and should request new demuxer configs.
-  DemuxerData data = CreateReadFromDemuxerAckWithConfigChanged(true, 0);
-  EXPECT_EQ(0, demuxer_->num_config_requests());
+  // sending an AU with |kConfigChanged|.
+  DemuxerData data = CreateReadFromDemuxerAckWithConfigChanged(
+      true, 0, configs);
   player_.OnDemuxerDataAvailable(data);
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-
-  // Simulate arrival of new configs.
-  player_.OnDemuxerConfigsAvailable(CreateAudioDemuxerConfigs(kCodecVorbis));
 
   PrerollDecoderToTime(
       true, base::TimeDelta(), base::TimeDelta::FromMilliseconds(100));
 }
 
 TEST_F(MediaSourcePlayerTest, SimultaneousAudioVideoConfigChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that the player allows simultaneous audio and video config change,
   // such as might occur during OnPrefetchDone() if next access unit for both
   // audio and video jobs is |kConfigChanged|.
   CreateNextTextureAndSetVideoSurface();
   Start(CreateAudioVideoDemuxerConfigs(), true);
-  MediaDecoderJob* first_audio_job = GetMediaDecoderJob(true);
-  MediaDecoderJob* first_video_job = GetMediaDecoderJob(false);
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  EXPECT_TRUE(GetMediaCodecBridge(true));
+  EXPECT_TRUE(GetMediaCodecBridge(false));
+  WaitForAudioVideoDecodeDone();
 
   // Simulate audio |kConfigChanged| prefetched as standalone access unit.
+  DemuxerConfigs audio_configs = CreateAudioDemuxerConfigs(kCodecVorbis);
+  audio_configs.audio_sampling_rate = 11025;
   player_.OnDemuxerDataAvailable(
-      CreateReadFromDemuxerAckWithConfigChanged(true, 0));
-  EXPECT_EQ(0, demuxer_->num_config_requests());  // No OnPrefetchDone() yet.
+      CreateReadFromDemuxerAckWithConfigChanged(true, 0, audio_configs));
 
   // Simulate video |kConfigChanged| prefetched as standalone access unit.
   player_.OnDemuxerDataAvailable(
-      CreateReadFromDemuxerAckWithConfigChanged(false, 0));
-  EXPECT_EQ(1, demuxer_->num_config_requests());  // OnPrefetchDone() occurred.
-  EXPECT_EQ(2, demuxer_->num_data_requests());  // No more data requested yet.
+      CreateReadFromDemuxerAckWithConfigChanged(
+          false, 0, CreateVideoDemuxerConfigs(kCodecVP9)));
+  EXPECT_EQ(6, demuxer_->num_data_requests());
+  EXPECT_TRUE(IsDrainingDecoder(true));
+  EXPECT_TRUE(IsDrainingDecoder(false));
 
-  // No job re-creation should occur until the requested configs arrive.
-  EXPECT_EQ(first_audio_job, GetMediaDecoderJob(true));
-  EXPECT_EQ(first_video_job, GetMediaDecoderJob(false));
-
-  player_.OnDemuxerConfigsAvailable(CreateAudioVideoDemuxerConfigs());
-  EXPECT_EQ(4, demuxer_->num_data_requests());
-  MediaDecoderJob* second_audio_job = GetMediaDecoderJob(true);
-  MediaDecoderJob* second_video_job = GetMediaDecoderJob(false);
-  EXPECT_NE(first_audio_job, second_audio_job);
-  EXPECT_NE(first_video_job, second_video_job);
-  EXPECT_TRUE(second_audio_job && second_video_job);
-
-  // Confirm no further demuxer configs requested.
-  EXPECT_EQ(1, demuxer_->num_config_requests());
+  // Waiting for decoder to finish draining.
+  while (IsDrainingDecoder(true) || IsDrainingDecoder(false))
+    message_loop_.RunUntilIdle();
 }
 
 TEST_F(MediaSourcePlayerTest, DemuxerConfigRequestedIfInPrefetchUnit0) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that the player detects need for and requests demuxer configs if
   // the |kConfigChanged| unit is the very first unit in the set of units
   // received in OnDemuxerDataAvailable() ostensibly while
   // |PREFETCH_DONE_EVENT_PENDING|.
   StartConfigChange(true, true, 0);
@@ skipping 32 matching lines @@
 TEST_F(MediaSourcePlayerTest, BrowserSeek_PrerollAfterBrowserSeek) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test decoder job will preroll the media to the actual seek position
   // resulting from a browser seek.
   BrowserSeekPlayer(false);
 
   // Simulate browser seek is done, but to a later time than was requested.
   EXPECT_LT(player_.GetCurrentTime().InMillisecondsF(), 100);
   player_.OnDemuxerSeekDone(base::TimeDelta::FromMilliseconds(100));
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  // Because next AU is not I-frame, MediaCodecBridge will not be recreated.
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(100.0, player_.GetCurrentTime().InMillisecondsF());
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   PrerollDecoderToTime(
       false, base::TimeDelta(), base::TimeDelta::FromMilliseconds(100));
 }
 
 TEST_F(MediaSourcePlayerTest, VideoDemuxerConfigChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that video config change notification results in request for demuxer
   // configuration, and that a video decoder job results without any browser
   // seek necessary once the new demuxer config arrives.
   StartConfigChange(false, true, 1);
-  MediaDecoderJob* first_job = GetMediaDecoderJob(false);
-  EXPECT_TRUE(first_job);
-  EXPECT_EQ(1, demuxer_->num_data_requests());
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-
-  // Simulate arrival of new configs.
-  player_.OnDemuxerConfigsAvailable(CreateVideoDemuxerConfigs());
 
   // New video decoder job should have been created and configured, without any
   // browser seek.
-  MediaDecoderJob* second_job = GetMediaDecoderJob(false);
-  EXPECT_TRUE(second_job);
-  EXPECT_NE(first_job, second_job);
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-  EXPECT_EQ(1, demuxer_->num_config_requests());
+  EXPECT_TRUE(GetMediaCodecBridge(false));
+  EXPECT_EQ(3, demuxer_->num_data_requests());
   EXPECT_EQ(0, demuxer_->num_seek_requests());
 }
 
-TEST_F(MediaSourcePlayerTest, VideoConfigChangeContinuesAcrossSeek) {
+TEST_F(MediaSourcePlayerTest, DecoderDrainInterruptedBySeek) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
-  // Test if a demuxer config request is pending (due to previously receiving
-  // |kConfigChanged|), and a seek request arrives prior to demuxer configs,
-  // then seek is processed first, followed by the decoder config change.
-  // This assumes the demuxer sends |kConfigChanged| read response prior to
-  // canceling any reads pending seek; no |kAborted| is involved in this test.
-  StartConfigChange(false, false, 1);
-  MediaDecoderJob* first_job = GetMediaDecoderJob(false);
-  EXPECT_TRUE(first_job);
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-  EXPECT_EQ(0, demuxer_->num_seek_requests());
+  // Test if a decoder is being drained while receiving a seek request, draining
+  // is canceled.
+  SendConfigChangeToDecoder(true, false, 0);
+  EXPECT_TRUE(IsDrainingDecoder(true));
 
   player_.SeekTo(base::TimeDelta::FromMilliseconds(100));
+  WaitForAudioDecodeDone();
+  player_.OnDemuxerSeekDone(kNoTimestamp());
 
-  // Verify that the seek is requested immediately.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
+  EXPECT_EQ(4, demuxer_->num_data_requests());
+  EXPECT_FALSE(IsDrainingDecoder(true));
+}
 
-  // Simulate unlikely delayed arrival of the demuxer configs, completing the
-  // config change.
-  // TODO(wolenetz): Is it even possible for requested demuxer configs to be
-  // delayed until after a SeekTo request arrives?
-  player_.OnDemuxerConfigsAvailable(CreateVideoDemuxerConfigs());
+TEST_F(MediaSourcePlayerTest, DecoderDrainInterruptedByRelease) {
+  SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
-  MediaDecoderJob* second_job = GetMediaDecoderJob(false);
-  EXPECT_NE(first_job, second_job);
-  EXPECT_TRUE(second_job);
+  // Test if a decoder is being drained while receiving a release request,
+  // draining is canceled.
+  SendConfigChangeToDecoder(true, false, 0);
+  EXPECT_TRUE(IsDrainingDecoder(true));
 
-  // Send back the seek done notification. This should finish the seek and
-  // trigger the player to request more data.
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-  player_.OnDemuxerSeekDone(kNoTimestamp());
+  ReleasePlayer();
+  WaitForAudioDecodeDone();
+  EXPECT_EQ(3, demuxer_->num_data_requests());
+  EXPECT_FALSE(IsDrainingDecoder(true));
+
+  EXPECT_FALSE(GetMediaCodecBridge(true));
+  EXPECT_FALSE(player_.IsPlaying());
+
+  player_.Start();
+  EXPECT_TRUE(player_.IsPlaying());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 }
 
-TEST_F(MediaSourcePlayerTest, NewSurfaceWhileChangingConfigs) {
+TEST_F(MediaSourcePlayerTest, DecoderDrainInterruptedBySurfaceChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
-  // Test that no seek or duplicated demuxer config request results from a
-  // SetVideoSurface() that occurs while the player is expecting new demuxer
-  // configs. This test may be good to keep beyond browser seek hack.
-  StartConfigChange(false, false, 1);
-  MediaDecoderJob* first_job = GetMediaDecoderJob(false);
-  EXPECT_TRUE(first_job);
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-  EXPECT_EQ(2, demuxer_->num_data_requests());
+  // Test if a video decoder is being drained while surface changes, draining
+  // is canceled.
+  SendConfigChangeToDecoder(false, false, 0);
+  EXPECT_TRUE(IsDrainingDecoder(false));
 
   CreateNextTextureAndSetVideoSurface();
+  WaitForVideoDecodeDone();
 
-  // Surface change processing (including decoder job re-creation) should
-  // not occur until the pending video config change is completed.
-  EXPECT_EQ(first_job, GetMediaDecoderJob(false));
+  EXPECT_FALSE(IsDrainingDecoder(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
+  EXPECT_TRUE(player_.IsPlaying());
+  EXPECT_EQ(3, demuxer_->num_data_requests());
 
-  player_.OnDemuxerConfigsAvailable(CreateVideoDemuxerConfigs());
-  MediaDecoderJob* second_job = GetMediaDecoderJob(false);
-  EXPECT_NE(first_job, second_job);
-  EXPECT_TRUE(second_job);
-
-  EXPECT_EQ(3, demuxer_->num_data_requests());
-  EXPECT_EQ(1, demuxer_->num_config_requests());
-  EXPECT_EQ(0, demuxer_->num_seek_requests());
+  // Finish the browser seek introduced by surface change.
+  player_.OnDemuxerSeekDone(base::TimeDelta());
+  EXPECT_EQ(4, demuxer_->num_data_requests());
 }
 
 TEST_F(MediaSourcePlayerTest,
        BrowserSeek_DecoderStarvationWhilePendingSurfaceChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test video decoder starvation while handling a pending surface change
   // should not cause any crashes.
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
   DemuxerData data = CreateReadFromDemuxerAckForVideo();
   player_.OnDemuxerDataAvailable(data);
 
   // Trigger a surface change and decoder starvation.
   CreateNextTextureAndSetVideoSurface();
   TriggerPlayerStarvation();
   WaitForVideoDecodeDone();
   EXPECT_EQ(0, demuxer_->num_browser_seek_requests());
 
   // Surface change should trigger a seek.
   player_.OnDemuxerDataAvailable(data);
   EXPECT_EQ(1, demuxer_->num_browser_seek_requests());
   player_.OnDemuxerSeekDone(base::TimeDelta());
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  // After seek is done, prefetch is handled first. MediaCodecBridge is not
+  // created at this moment.
+  EXPECT_FALSE(GetMediaCodecBridge(false));
 
   // A new data request should be sent.
   EXPECT_EQ(3, demuxer_->num_data_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, ReleaseWithOnPrefetchDoneAlreadyPosted) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if OnPrefetchDone() had already been posted before and is executed
   // after Release(), then player does not DCHECK. This test is fragile to
   // change to MediaDecoderJob::Prefetch() implementation; it assumes task
   // is posted to run |prefetch_cb| if the job already HasData().
   // TODO(wolenetz): Remove MSP::set_decode_callback_for_testing() if this test
   // becomes obsolete. See http://crbug.com/304234.
   StartAudioDecoderJob(true);
 
   // Escape the original prefetch by decoding a single access unit.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
   WaitForAudioDecodeDone();
 
   // Prime the job with a few more access units, so that a later prefetch,
   // triggered by starvation to simulate decoder underrun, can trivially
   // post task to run OnPrefetchDone().
   player_.OnDemuxerDataAvailable(
-      CreateReadFromDemuxerAckWithConfigChanged(true, 4));
+      CreateReadFromDemuxerAckWithConfigChanged(
+          true, 4, CreateAudioDemuxerConfigs(kCodecVorbis)));
   EXPECT_TRUE(GetMediaDecoderJob(true)->is_decoding());
 
   // Simulate decoder underrun, so trivial prefetch starts while still decoding.
   // The prefetch and posting of OnPrefetchDone() will not occur until next
   // MediaDecoderCallBack() occurs.
   TriggerPlayerStarvation();
 
   // Upon the next successful decode callback, post a task to call Release() on
   // the |player_|, such that the trivial OnPrefetchDone() task posting also
   // occurs and should execute after the Release().
   OnNextTestDecodeCallbackPostTaskToReleasePlayer();
 
   WaitForAudioDecodeDone();
-  EXPECT_TRUE(decoder_callback_hook_executed_);
-  EXPECT_EQ(2, demuxer_->num_data_requests());
 
-  // Player should have no decoder job until after Start().
-  StartAudioDecoderJob(true);
+  EXPECT_EQ(3, demuxer_->num_data_requests());
+
+  // Player should not request any new data since the access units haven't
+  // been fully decoded yet.
+  StartAudioDecoderJob(false);
 }
 
 TEST_F(MediaSourcePlayerTest, SeekToThenReleaseThenDemuxerSeekAndDone) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if Release() occurs after SeekTo(), but the DemuxerSeek IPC request
   // has not yet been sent, then the seek request is sent after Release(). Also,
   // test if OnDemuxerSeekDone() occurs prior to next Start(), then the player
   // will resume correct post-seek preroll upon Start().
   StartAudioDecoderJobAndSeekToWhileDecoding(
       base::TimeDelta::FromMilliseconds(100));
   ReleasePlayer();
+  EXPECT_EQ(0, demuxer_->num_seek_requests());
+  WaitForAudioDecodeDone();
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   player_.OnDemuxerSeekDone(kNoTimestamp());
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
-  EXPECT_FALSE(GetMediaDecoderJob(true));
+  EXPECT_FALSE(GetMediaCodecBridge(true));
   EXPECT_FALSE(player_.IsPlaying());
 
   // Player should begin prefetch and resume preroll upon Start().
   EXPECT_EQ(2, demuxer_->num_data_requests());
   StartAudioDecoderJob(true);
   EXPECT_TRUE(IsPrerolling(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
 
   // No further seek should have been requested since Release(), above.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, SeekToThenReleaseThenDemuxerSeekThenStart) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if Release() occurs after SeekTo(), but the DemuxerSeek IPC request
   // has not yet been sent, then the seek request is sent after Release(). Also,
   // test if OnDemuxerSeekDone() does not occur until after the next Start(),
   // then the player remains pending seek done until (and resumes correct
   // post-seek preroll after) OnDemuxerSeekDone().
   StartAudioDecoderJobAndSeekToWhileDecoding(
       base::TimeDelta::FromMilliseconds(100));
   ReleasePlayer();
-  EXPECT_EQ(1, demuxer_->num_seek_requests());
+  EXPECT_EQ(0, demuxer_->num_seek_requests());
 
   // Player should not prefetch upon Start() nor create the decoder job, due to
   // awaiting DemuxerSeekDone.
   EXPECT_EQ(2, demuxer_->num_data_requests());
   StartAudioDecoderJob(false);
 
+  WaitForAudioDecodeDone();
+  EXPECT_EQ(1, demuxer_->num_seek_requests());
   player_.OnDemuxerSeekDone(kNoTimestamp());
   EXPECT_TRUE(GetMediaDecoderJob(true));
   EXPECT_TRUE(IsPrerolling(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   // No further seek should have been requested since Release(), above.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, SeekToThenDemuxerSeekThenReleaseThenSeekDone) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if Release() occurs after a SeekTo()'s subsequent DemuxerSeek IPC
   // request and OnDemuxerSeekDone() arrives prior to the next Start(), then the
   // player will resume correct post-seek preroll upon Start().
   StartAudioDecoderJobAndSeekToWhileDecoding(
       base::TimeDelta::FromMilliseconds(100));
   WaitForAudioDecodeDone();
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   ReleasePlayer();
   player_.OnDemuxerSeekDone(kNoTimestamp());
   EXPECT_FALSE(player_.IsPlaying());
-  EXPECT_FALSE(GetMediaDecoderJob(true));
+  EXPECT_FALSE(GetMediaCodecBridge(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
 
   // Player should begin prefetch and resume preroll upon Start().
   EXPECT_EQ(2, demuxer_->num_data_requests());
   StartAudioDecoderJob(true);
   EXPECT_TRUE(IsPrerolling(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
 
   // No further seek should have been requested since before Release(), above.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, SeekToThenReleaseThenStart) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if Release() occurs after a SeekTo()'s subsequent DemuxerSeeK IPC
   // request and OnDemuxerSeekDone() does not occur until after the next
   // Start(), then the player remains pending seek done until (and resumes
   // correct post-seek preroll after) OnDemuxerSeekDone().
   StartAudioDecoderJobAndSeekToWhileDecoding(
       base::TimeDelta::FromMilliseconds(100));
   WaitForAudioDecodeDone();
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 
   ReleasePlayer();
   EXPECT_EQ(2, demuxer_->num_data_requests());
   StartAudioDecoderJob(false);
 
   player_.OnDemuxerSeekDone(kNoTimestamp());
-  EXPECT_TRUE(GetMediaDecoderJob(true));
+  EXPECT_FALSE(GetMediaCodecBridge(true));
   EXPECT_TRUE(IsPrerolling(true));
   EXPECT_EQ(100.0, GetPrerollTimestamp().InMillisecondsF());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   // No further seek should have been requested since before Release(), above.
   EXPECT_EQ(1, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, ConfigChangedThenReleaseThenConfigsAvailable) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
-  // Test if Release() occurs after |kConfigChanged| detected, new configs
-  // requested of demuxer, and the requested configs arrive before the next
-  // Start(), then the player completes the pending config change processing on
-  // their receipt.
+  // Test if Release() occurs after |kConfigChanged| is processed, new data
+  // requested of demuxer, and the requested data arrive before the next
+  // Start(), then the player starts to decode the new data without any browser
+  // seek.
   StartConfigChange(true, true, 0);
   ReleasePlayer();
 
-  player_.OnDemuxerConfigsAvailable(CreateAudioDemuxerConfigs(kCodecVorbis));
-  EXPECT_FALSE(GetMediaDecoderJob(true));
+  EXPECT_TRUE(GetMediaCodecBridge(true));
   EXPECT_FALSE(player_.IsPlaying());
-  EXPECT_EQ(1, demuxer_->num_data_requests());
+  EXPECT_EQ(3, demuxer_->num_data_requests());
+  player_.OnDemuxerDataAvailable(
+        CreateReadFromDemuxerAckWithConfigChanged(
+            true, 4, CreateAudioDemuxerConfigs(kCodecVorbis)));
+  WaitForAudioDecodeDone();
+  EXPECT_FALSE(GetMediaCodecBridge(true));
 
   // Player should resume upon Start(), even without further configs supplied.
   player_.Start();
-  EXPECT_TRUE(GetMediaDecoderJob(true));
   EXPECT_TRUE(player_.IsPlaying());
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-
-  // No further config request should have occurred since StartConfigChange().
-  EXPECT_EQ(1, demuxer_->num_config_requests());
+  EXPECT_EQ(3, demuxer_->num_data_requests());
+  EXPECT_EQ(0, demuxer_->num_seek_requests());
 }
 
 TEST_F(MediaSourcePlayerTest, ConfigChangedThenReleaseThenStart) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test if Release() occurs after |kConfigChanged| detected, new configs
   // requested of demuxer, and the requested configs arrive after the next
   // Start(), then the player pends job creation until the new configs arrive.
   StartConfigChange(true, true, 0);
   ReleasePlayer();
 
   player_.Start();
   EXPECT_TRUE(player_.IsPlaying());
-  EXPECT_FALSE(GetMediaDecoderJob(true));
-  EXPECT_EQ(1, demuxer_->num_data_requests());
+  // The previous MediaCodecBridge still haven't finished decoding the data
+  // yet.
+  EXPECT_TRUE(GetMediaCodecBridge(true));
+  EXPECT_EQ(3, demuxer_->num_data_requests());
 
-  player_.OnDemuxerConfigsAvailable(CreateAudioDemuxerConfigs(kCodecVorbis));
-  EXPECT_TRUE(GetMediaDecoderJob(true));
-  EXPECT_EQ(2, demuxer_->num_data_requests());
-
-  // No further config request should have occurred since StartConfigChange().
-  EXPECT_EQ(1, demuxer_->num_config_requests());
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(0));
+  EXPECT_EQ(3, demuxer_->num_data_requests());
+  WaitForAudioDecodeDone();
+  EXPECT_FALSE(GetMediaCodecBridge(true));
 }
 
 TEST_F(MediaSourcePlayerTest, BrowserSeek_ThenReleaseThenDemuxerSeekDone) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that Release() after a browser seek's DemuxerSeek IPC request has been
   // sent behaves similar to a regular seek: if OnDemuxerSeekDone() occurs
   // before the next Start()+SetVideoSurface(), then the player will resume
   // correct post-seek preroll upon Start()+SetVideoSurface().
   BrowserSeekPlayer(false);
   base::TimeDelta expected_preroll_timestamp = player_.GetCurrentTime();
   ReleasePlayer();
 
   player_.OnDemuxerSeekDone(expected_preroll_timestamp);
   EXPECT_FALSE(player_.IsPlaying());
-  EXPECT_FALSE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_EQ(expected_preroll_timestamp, GetPrerollTimestamp());
 
   // Player should begin prefetch and resume preroll upon Start().
   EXPECT_EQ(2, demuxer_->num_data_requests());
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(true);
   EXPECT_TRUE(IsPrerolling(false));
   EXPECT_EQ(expected_preroll_timestamp, GetPrerollTimestamp());
   EXPECT_EQ(expected_preroll_timestamp, player_.GetCurrentTime());
 
@@ skipping 11 matching lines @@
   // after) OnDemuxerSeekDone().
   BrowserSeekPlayer(false);
   base::TimeDelta expected_preroll_timestamp = player_.GetCurrentTime();
   ReleasePlayer();
 
   EXPECT_EQ(2, demuxer_->num_data_requests());
   CreateNextTextureAndSetVideoSurface();
   StartVideoDecoderJob(false);
 
   player_.OnDemuxerSeekDone(expected_preroll_timestamp);
-  EXPECT_TRUE(GetMediaDecoderJob(false));
+  // Prefetch takes place first, and the decoder is not created yet.
+  EXPECT_FALSE(GetMediaCodecBridge(false));
   EXPECT_TRUE(IsPrerolling(false));
   EXPECT_EQ(expected_preroll_timestamp, GetPrerollTimestamp());
   EXPECT_EQ(expected_preroll_timestamp, player_.GetCurrentTime());
   EXPECT_EQ(3, demuxer_->num_data_requests());
 
   // No further seek should have been requested since BrowserSeekPlayer().
   EXPECT_EQ(1, demuxer_->num_seek_requests());
+
+  // Decoder will be created once data is received.
+  player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForVideo());
+  while (!GetMediaCodecBridge(false))
+    message_loop_.RunUntilIdle();
 }
 
 // TODO(xhwang): Once we add tests to cover DrmBridge, update this test to
 // also verify that the job is successfully created if SetDrmBridge(), Start()
 // and eventually OnMediaCrypto() occur. This would increase test coverage of
 // http://crbug.com/313470 and allow us to remove inspection of internal player
 // pending event state. See http://crbug.com/313860.
 TEST_F(MediaSourcePlayerTest, SurfaceChangeClearedEvenIfMediaCryptoAbsent) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that |SURFACE_CHANGE_EVENT_PENDING| is not pending after
   // SetVideoSurface() for a player configured for encrypted video, when the
   // player has not yet received media crypto.
-  DemuxerConfigs configs = CreateVideoDemuxerConfigs();
+  DemuxerConfigs configs = CreateVideoDemuxerConfigs(kCodecVP8);
   configs.is_video_encrypted = true;
 
   player_.OnDemuxerConfigsAvailable(configs);
   CreateNextTextureAndSetVideoSurface();
-  EXPECT_FALSE(IsPendingSurfaceChange());
-  EXPECT_FALSE(GetMediaDecoderJob(false));
+  EXPECT_FALSE(GetMediaCodecBridge(false));
 }
 
 TEST_F(MediaSourcePlayerTest, CurrentTimeUpdatedWhileDecoderStarved) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test that current time is updated while decoder is starved.
   StartAudioDecoderJob(true);
   DecodeAudioDataUntilOutputBecomesAvailable();
 
   // Trigger starvation while the decoder is decoding.
   player_.OnDemuxerDataAvailable(CreateReadFromDemuxerAckForAudio(3));
   manager_.ResetTimestampUpdated();
   TriggerPlayerStarvation();
   WaitForAudioDecodeDone();
 
   // Current time should be updated.
   EXPECT_TRUE(manager_.timestamp_updated());
 }
 
 TEST_F(MediaSourcePlayerTest, CurrentTimeKeepsIncreasingAfterConfigChange) {
   SKIP_TEST_IF_MEDIA_CODEC_BRIDGE_IS_NOT_AVAILABLE();
 
   // Test current time keep on increasing after audio config change.
   // Test that current time is updated while decoder is starved.
   StartAudioDecoderJob(true);
 
   DecodeAudioDataUntilOutputBecomesAvailable();
 
-  DemuxerData data = CreateReadFromDemuxerAckWithConfigChanged(true, 0);
+  DemuxerConfigs configs = CreateAudioDemuxerConfigs(kCodecVorbis);
+  configs.audio_sampling_rate = 11025;
+  DemuxerData data = CreateReadFromDemuxerAckWithConfigChanged(
+      true, 0, configs);
   player_.OnDemuxerDataAvailable(data);
   WaitForAudioDecodeDone();
-
-  // Simulate arrival of new configs.
-  player_.OnDemuxerConfigsAvailable(CreateAudioDemuxerConfigs(kCodecVorbis));
   DecodeAudioDataUntilOutputBecomesAvailable();
 }
 
 }  // namespace media