media/base/android/media_source_player.h

   1 // Copyright (c) 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 #ifndef MEDIA_BASE_ANDROID_MEDIA_SOURCE_PLAYER_H_
   6 #define MEDIA_BASE_ANDROID_MEDIA_SOURCE_PLAYER_H_
   7
   8 #include <jni.h>
   9 #include <map>
  10 #include <string>
  11 #include <vector>
  12
  13 #include "base/android/scoped_java_ref.h"
  14 #include "base/callback.h"
  15 #include "base/cancelable_callback.h"
  16 #include "base/memory/scoped_ptr.h"
  17 #include "base/memory/weak_ptr.h"
  18 #include "base/threading/thread.h"
  19 #include "base/time/default_tick_clock.h"
  20 #include "base/time/time.h"
  21 #include "media/base/android/demuxer_android.h"
  22 #include "media/base/android/media_codec_bridge.h"
  23 #include "media/base/android/media_decoder_job.h"
  24 #include "media/base/android/media_drm_bridge.h"
  25 #include "media/base/android/media_player_android.h"
  26 #include "media/base/clock.h"
  27 #include "media/base/media_export.h"
  28
  29 namespace media {
  30
  31 class AudioDecoderJob;
  32 class VideoDecoderJob;
  33
  34 // This class handles media source extensions on Android. It uses Android
  35 // MediaCodec to decode audio and video streams in two separate threads.
  36 class MEDIA_EXPORT MediaSourcePlayer : public MediaPlayerAndroid,
  37                                        public DemuxerAndroidClient {
  38  public:
  39   // Constructs a player with the given ID and demuxer. |manager| must outlive
  40   // the lifetime of this object.
  41   MediaSourcePlayer(int player_id,
  42                     MediaPlayerManager* manager,
  43                     const RequestMediaResourcesCB& request_media_resources_cb,
  44                     const ReleaseMediaResourcesCB& release_media_resources_cb,
  45                     scoped_ptr<DemuxerAndroid> demuxer);
  46   virtual ~MediaSourcePlayer();
  47
  48   // MediaPlayerAndroid implementation.
  49   virtual void SetVideoSurface(gfx::ScopedJavaSurface surface) OVERRIDE;
  50   virtual void Start() OVERRIDE;
  51   virtual void Pause(bool is_media_related_action ALLOW_UNUSED) OVERRIDE;
  52   virtual void SeekTo(base::TimeDelta timestamp) OVERRIDE;
  53   virtual void Release() OVERRIDE;
  54   virtual void SetVolume(double volume) OVERRIDE;
  55   virtual int GetVideoWidth() OVERRIDE;
  56   virtual int GetVideoHeight() OVERRIDE;
  57   virtual base::TimeDelta GetCurrentTime() OVERRIDE;
  58   virtual base::TimeDelta GetDuration() OVERRIDE;
  59   virtual bool IsPlaying() OVERRIDE;
  60   virtual bool CanPause() OVERRIDE;
  61   virtual bool CanSeekForward() OVERRIDE;
  62   virtual bool CanSeekBackward() OVERRIDE;
  63   virtual bool IsPlayerReady() OVERRIDE;
  64   virtual void SetDrmBridge(MediaDrmBridge* drm_bridge) OVERRIDE;
  65   virtual void OnKeyAdded() OVERRIDE;
  66   virtual bool IsSurfaceInUse() const OVERRIDE;
  67
  68   // DemuxerAndroidClient implementation.
  69   virtual void OnDemuxerConfigsAvailable(const DemuxerConfigs& params) OVERRIDE;
  70   virtual void OnDemuxerDataAvailable(const DemuxerData& params) OVERRIDE;
  71   virtual void OnDemuxerSeekDone(
  72       base::TimeDelta actual_browser_seek_time) OVERRIDE;
  73   virtual void OnDemuxerDurationChanged(base::TimeDelta duration) OVERRIDE;
  74
  75  private:
  76   friend class MediaSourcePlayerTest;
  77
  78   // Update the current timestamp.
  79   void UpdateTimestamps(base::TimeDelta current_presentation_timestamp,
  80                         base::TimeDelta max_presentation_timestamp);
  81
  82   // Helper function for starting media playback.
  83   void StartInternal();
  84
  85   // Playback is completed for one channel.
  86   void PlaybackCompleted(bool is_audio);
  87
  88   // Called when the decoder finishes its task.
  89   void MediaDecoderCallback(
  90         bool is_audio, MediaCodecStatus status,
  91         base::TimeDelta current_presentation_timestamp,
  92         base::TimeDelta max_presentation_timestamp);
  93
  94   // Gets MediaCrypto object from |drm_bridge_|.
  95   base::android::ScopedJavaLocalRef<jobject> GetMediaCrypto();
  96
  97   // Callback to notify that MediaCrypto is ready in |drm_bridge_|.
  98   void OnMediaCryptoReady();
  99
 100   // Handle pending events if all the decoder jobs are not currently decoding.
 101   void ProcessPendingEvents();
 102
 103   // Helper method to clear any pending |SURFACE_CHANGE_EVENT_PENDING|
 104   // and reset |video_decoder_job_| to null.
 105   void ResetVideoDecoderJob();
 106   void ResetAudioDecoderJob();
 107
 108   // Helper methods to configure the decoder jobs.
 109   void ConfigureVideoDecoderJob();
 110   void ConfigureAudioDecoderJob();
 111
 112   // Flush the decoders and clean up all the data needs to be decoded.
 113   void ClearDecodingData();
 114
 115   // Called to decode more data.
 116   void DecodeMoreAudio();
 117   void DecodeMoreVideo();
 118
 119   // Functions check whether audio/video is present.
 120   bool HasVideo();
 121   bool HasAudio();
 122
 123   // Functions that check whether audio/video stream has reached end of output
 124   // or are not present in player configuration.
 125   bool AudioFinished();
 126   bool VideoFinished();
 127
 128   // Determine seekability based on duration.
 129   bool Seekable();
 130
 131   // Called when the |decoder_starvation_callback_| times out.
 132   void OnDecoderStarved();
 133
 134   // Starts the |decoder_starvation_callback_| task with the timeout value.
 135   // |current_presentation_timestamp| - The presentation timestamp used for
 136   // starvation timeout computations. It represents the current timestamp of
 137   // rendered data.
 138   // |max_presentation_timestamp| - The presentation timestamp if all the
 139   // decoded data are rendered.
 140   void StartStarvationCallback(
 141       base::TimeDelta current_presentation_timestamp,
 142       base::TimeDelta max_presentation_timestamp);
 143
 144   // Schedules a seek event in |pending_events_| and calls StopDecode() on all
 145   // the MediaDecoderJobs. Sets clock to |seek_time|, and resets
 146   // |pending_seek_|. There must not already be a seek event in
 147   // |pending_events_|.
 148   void ScheduleSeekEventAndStopDecoding(base::TimeDelta seek_time);
 149
 150   // Schedules a browser seek event. We must not currently be processing any
 151   // seek. Note that there is possibility that browser seek of renderer demuxer
 152   // may unexpectedly stall due to lack of buffered data at or after the browser
 153   // seek time.
 154   // TODO(wolenetz): Instead of doing hack browser seek, replay cached data
 155   // since last keyframe. See http://crbug.com/304234.
 156   void BrowserSeekToCurrentTime();
 157
 158   // Helper function to set the volume.
 159   void SetVolumeInternal();
 160
 161   // Helper function to determine whether a protected surface is needed for
 162   // video playback.
 163   bool IsProtectedSurfaceRequired();
 164
 165   // Called when a MediaDecoderJob finishes prefetching data. Once all
 166   // MediaDecoderJobs have prefetched data, then this method updates
 167   // |start_time_ticks_| and |start_presentation_timestamp_| so that video can
 168   // resync with audio and starts decoding.
 169   void OnPrefetchDone();
 170
 171   // Test-only method to setup hook for the completion of the next decode cycle.
 172   // This callback state is cleared when it is next run.
 173   // Prevent usage creep by only calling this from the
 174   // ReleaseWithOnPrefetchDoneAlreadyPosted MediaSourcePlayerTest.
 175   void set_decode_callback_for_testing(const base::Closure& test_decode_cb) {
 176     decode_callback_for_testing_ = test_decode_cb;
 177   }
 178
 179   // TODO(qinmin/wolenetz): Reorder these based on their priority from
 180   // ProcessPendingEvents(). Release() and other routines are dependent upon
 181   // priority consistency.
 182   enum PendingEventFlags {
 183     NO_EVENT_PENDING = 0,
 184     SEEK_EVENT_PENDING = 1 << 0,
 185     SURFACE_CHANGE_EVENT_PENDING = 1 << 1,
 186     CONFIG_CHANGE_EVENT_PENDING = 1 << 2,
 187     PREFETCH_REQUEST_EVENT_PENDING = 1 << 3,
 188     PREFETCH_DONE_EVENT_PENDING = 1 << 4,
 189   };
 190
 191   static const char* GetEventName(PendingEventFlags event);
 192   bool IsEventPending(PendingEventFlags event) const;
 193   void SetPendingEvent(PendingEventFlags event);
 194   void ClearPendingEvent(PendingEventFlags event);
 195
 196   scoped_ptr<DemuxerAndroid> demuxer_;
 197
 198   // Pending event that the player needs to do.
 199   unsigned pending_event_;
 200
 201   // Stats about the media.
 202   base::TimeDelta duration_;
 203   int width_;
 204   int height_;
 205   AudioCodec audio_codec_;
 206   VideoCodec video_codec_;
 207   int num_channels_;
 208   int sampling_rate_;
 209   // TODO(xhwang/qinmin): Add |video_extra_data_|.
 210   std::vector<uint8> audio_extra_data_;
 211   bool reached_audio_eos_;
 212   bool reached_video_eos_;
 213   bool playing_;
 214   bool is_audio_encrypted_;
 215   bool is_video_encrypted_;
 216   double volume_;
 217
 218   // base::TickClock used by |clock_|.
 219   base::DefaultTickClock default_tick_clock_;
 220
 221   // Reference clock. Keeps track of current playback time.
 222   Clock clock_;
 223
 224   // Timestamps for providing simple A/V sync. When start decoding an audio
 225   // chunk, we record its presentation timestamp and the current system time.
 226   // Then we use this information to estimate when the next audio/video frame
 227   // should be rendered.
 228   // TODO(qinmin): Need to fix the problem if audio/video lagged too far behind
 229   // due to network or decoding problem.
 230   base::TimeTicks start_time_ticks_;
 231   base::TimeDelta start_presentation_timestamp_;
 232
 233   // The surface object currently owned by the player.
 234   gfx::ScopedJavaSurface surface_;
 235
 236   // Track whether or not the player has received any video data since the most
 237   // recent of player construction, end of last seek, or receiving and
 238   // detecting a |kConfigChanged| access unit from the demuxer.
 239   // If no such video data has been received, the next video data begins with
 240   // an I-frame. Otherwise, we have no such guarantee.
 241   bool next_video_data_is_iframe_;
 242
 243   // Flag that is true if doing a hack browser seek or false if doing a
 244   // regular seek. Only valid when |SEEK_EVENT_PENDING| is pending.
 245   // TODO(wolenetz): Instead of doing hack browser seek, replay cached data
 246   // since last keyframe. See http://crbug.com/304234.
 247   bool doing_browser_seek_;
 248
 249   // If already doing a browser seek when a regular seek request arrives,
 250   // these fields remember the regular seek so OnDemuxerSeekDone() can trigger
 251   // it when the browser seek is done. These are only valid when
 252   // |SEEK_EVENT_PENDING| is pending.
 253   bool pending_seek_;
 254   base::TimeDelta pending_seek_time_;
 255
 256   // Decoder jobs.
 257   scoped_ptr<AudioDecoderJob, MediaDecoderJob::Deleter> audio_decoder_job_;
 258   scoped_ptr<VideoDecoderJob, MediaDecoderJob::Deleter> video_decoder_job_;
 259
 260   bool reconfig_audio_decoder_;
 261   bool reconfig_video_decoder_;
 262
 263   // Track the most recent preroll target. Decoder re-creation needs this to
 264   // resume any in-progress preroll.
 265   base::TimeDelta preroll_timestamp_;
 266
 267   // A cancelable task that is posted when the audio decoder starts requesting
 268   // new data. This callback runs if no data arrives before the timeout period
 269   // elapses.
 270   base::CancelableClosure decoder_starvation_callback_;
 271
 272   MediaDrmBridge* drm_bridge_;
 273
 274   // No decryption key available to decrypt the encrypted buffer. In this case,
 275   // the player should pause. When a new key is added (OnKeyAdded()), we should
 276   // try to start playback again.
 277   bool is_waiting_for_key_;
 278
 279   // Test-only callback for hooking the completion of the next decode cycle.
 280   base::Closure decode_callback_for_testing_;
 281
 282   // Whether |surface_| is currently used by the player.
 283   bool is_surface_in_use_;
 284
 285   // Whether there are pending data requests by the decoder.
 286   bool has_pending_audio_data_request_;
 287   bool has_pending_video_data_request_;
 288
 289   // Weak pointer passed to media decoder jobs for callbacks.
 290   // NOTE: Weak pointers must be invalidated before all other member variables.
 291   base::WeakPtrFactory<MediaSourcePlayer> weak_factory_;
 292
 293   DISALLOW_COPY_AND_ASSIGN(MediaSourcePlayer);
 294 };
 295
 296 }  // namespace media
 297
 298 #endif  // MEDIA_BASE_ANDROID_MEDIA_SOURCE_PLAYER_H_