MediaCodecPlayer implementation - stage 7 (DRM)

media/base/android/media_codec_player.cc

 // Copyright 2015 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 "media/base/android/media_codec_player.h"
 
 #include "base/barrier_closure.h"
 #include "base/bind.h"
 #include "base/lazy_instance.h"
 #include "base/logging.h"
 #include "base/thread_task_runner_handle.h"
 #include "base/threading/thread.h"
 #include "media/base/android/media_codec_audio_decoder.h"
 #include "media/base/android/media_codec_video_decoder.h"
+#include "media/base/android/media_drm_bridge.h"
 #include "media/base/android/media_player_manager.h"
 #include "media/base/timestamp_constants.h"
 
 #define RUN_ON_MEDIA_THREAD(METHOD, ...)                                     \
   do {                                                                       \
     if (!GetMediaTaskRunner()->BelongsToCurrentThread()) {                   \
       DCHECK(ui_task_runner_->BelongsToCurrentThread());                     \
       GetMediaTaskRunner()->PostTask(                                        \
           FROM_HERE, base::Bind(&MediaCodecPlayer::METHOD, media_weak_this_, \
                                 ##__VA_ARGS__));                             \
@@ skipping 30 matching lines @@
     : MediaPlayerAndroid(player_id,
                          manager.get(),
                          request_media_resources_cb,
                          frame_url),
       ui_task_runner_(base::ThreadTaskRunnerHandle::Get()),
       demuxer_(demuxer.Pass()),
       state_(kStatePaused),
       interpolator_(&default_tick_clock_),
       pending_start_(false),
       pending_seek_(kNoTimestamp()),
+      drm_bridge_(nullptr),
+      cdm_registration_id_(0),
+      key_is_required_(false),
+      key_is_added_(false),
       media_weak_factory_(this) {
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
 
   DVLOG(1) << "MediaCodecPlayer::MediaCodecPlayer: player_id:" << player_id;
 
   request_resources_cb_ = base::Bind(request_media_resources_cb_, player_id);
 
   completion_cb_ =
       base::Bind(&MediaPlayerManager::OnPlaybackComplete, manager, player_id);
+  key_required_cb_ = base::Bind(&MediaPlayerManager::OnWaitingForDecryptionKey,
+                                manager, player_id);
   seek_done_cb_ =
       base::Bind(&MediaPlayerManager::OnSeekComplete, manager, player_id);
   error_cb_ = base::Bind(&MediaPlayerManager::OnError, manager, player_id);
   attach_listener_cb_ = base::Bind(&MediaPlayerAndroid::AttachListener,
                                    WeakPtrForUIThread(), nullptr);
   detach_listener_cb_ =
       base::Bind(&MediaPlayerAndroid::DetachListener, WeakPtrForUIThread());
   metadata_changed_cb_ = base::Bind(&MediaPlayerAndroid::OnMediaMetadataChanged,
                                     WeakPtrForUIThread());
   time_update_cb_ =
@@ skipping 13 matching lines @@
 
   // Currently the unit tests wait for the MediaCodecPlayer destruction by
   // watching the demuxer, which is destroyed as one of the member variables.
   // Release the codecs here, before any member variable is destroyed to make
   // the unit tests happy.
 
   if (video_decoder_)
     video_decoder_->ReleaseDecoderResources();
   if (audio_decoder_)
     audio_decoder_->ReleaseDecoderResources();
+
+  if (drm_bridge_) {
+    DCHECK(cdm_registration_id_);
+    drm_bridge_->UnregisterPlayer(cdm_registration_id_);
+  }
 }
 
 void MediaCodecPlayer::Initialize() {
   DVLOG(1) << __FUNCTION__;
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   interpolator_.SetUpperBound(base::TimeDelta());
 
   CreateDecoders();
 
@@ skipping 99 matching lines @@
       }
       break;
     case kStateStopping:
     case kStateWaitingForSeek:
       SetPendingStart(true);
       break;
     case kStateWaitingForConfig:
     case kStatePrefetching:
     case kStatePlaying:
     case kStateWaitingForSurface:
+    case kStateWaitingForKey:
+    case kStateWaitingForCrypto:
     case kStateError:
       break;  // Ignore
     default:
       NOTREACHED();
       break;
   }
 }
 
 void MediaCodecPlayer::Pause(bool is_media_related_action) {
   RUN_ON_MEDIA_THREAD(Pause, is_media_related_action);
 
   DVLOG(1) << __FUNCTION__;
 
   SetPendingStart(false);
 
   switch (state_) {
     case kStateWaitingForConfig:
     case kStatePrefetching:
     case kStateWaitingForSurface:
+    case kStateWaitingForKey:
+    case kStateWaitingForCrypto:
       SetState(kStatePaused);
       StopDecoders();
       break;
     case kStatePlaying:
       SetState(kStateStopping);
       RequestToStopDecoders();
       break;
     case kStatePaused:
     case kStateStopping:
     case kStateWaitingForSeek:
@@ skipping 11 matching lines @@
   DVLOG(1) << __FUNCTION__ << " " << timestamp;
 
   switch (state_) {
     case kStatePaused:
       SetState(kStateWaitingForSeek);
       RequestDemuxerSeek(timestamp);
       break;
     case kStateWaitingForConfig:
     case kStatePrefetching:
     case kStateWaitingForSurface:
+    case kStateWaitingForKey:
+    case kStateWaitingForCrypto:
       SetState(kStateWaitingForSeek);
       StopDecoders();
       SetPendingStart(true);
       RequestDemuxerSeek(timestamp);
       break;
     case kStatePlaying:
       SetState(kStateStopping);
       RequestToStopDecoders();
       SetPendingStart(true);
       SetPendingSeek(timestamp);
@@ skipping 20 matching lines @@
   // Stop decoding threads and delete MediaCodecs, but keep IPC between browser
   // and renderer processes going. Seek should work across and after Release().
 
   ReleaseDecoderResources();
 
   SetPendingStart(false);
 
   if (state_ != kStateWaitingForSeek)
     SetState(kStatePaused);
 
+  // Crear encryption key related flags.
+  key_is_required_ = false;
+  key_is_added_ = false;
+
   base::TimeDelta pending_seek_time = GetPendingSeek();
   if (pending_seek_time != kNoTimestamp()) {
     SetPendingSeek(kNoTimestamp());
     SetState(kStateWaitingForSeek);
     RequestDemuxerSeek(pending_seek_time);
   }
 }
 
 void MediaCodecPlayer::SetVolume(double volume) {
   RUN_ON_MEDIA_THREAD(SetVolume, volume);
@@ skipping 49 matching lines @@
 }
 
 bool MediaCodecPlayer::IsPlayerReady() {
   DCHECK(ui_task_runner_->BelongsToCurrentThread());
   // This method is called to check whether it's safe to release the player when
   // the OS needs more resources. This class can be released at any time.
   return true;
 }
 
 void MediaCodecPlayer::SetCdm(BrowserCdm* cdm) {
-  DCHECK(ui_task_runner_->BelongsToCurrentThread());
-  NOTIMPLEMENTED();
+  RUN_ON_MEDIA_THREAD(SetCdm, cdm);
+
+  DVLOG(1) << __FUNCTION__;
+
+  // Currently we don't support DRM change during the middle of playback, even
+  // if the player is paused. There is no current plan to support it, see
+  // http://crbug.com/253792.
+  if (state_ != kStatePaused || GetInterpolatedTime() > base::TimeDelta()) {
+    VLOG(0) << "Setting DRM bridge after playback has started is not supported";
+    return;
+  }
+
+  if (drm_bridge_) {
+    NOTREACHED() << "Currently we do not support resetting CDM.";
+    return;
+  }
+
+  DCHECK(cdm);
+  drm_bridge_ = static_cast<MediaDrmBridge*>(cdm);
+
+  DCHECK(drm_bridge_);
+
+  DCHECK(audio_decoder_);
+  DCHECK(video_decoder_);
+  audio_decoder_->SetDrmBridge(drm_bridge_);
+  video_decoder_->SetDrmBridge(drm_bridge_);
+
+  cdm_registration_id_ = drm_bridge_->RegisterPlayer(
+      base::Bind(&MediaCodecPlayer::OnKeyAdded, media_weak_this_),
+      base::Bind(&MediaCodecPlayer::OnCdmUnset, media_weak_this_));
+
+  // If the crypto is ready by this time, OnMediaCryptoReady will be posted
+  // immediately, otherwise it will be posted when the crypro is ready.
+  drm_bridge_->SetMediaCryptoReadyCB(
+      base::Bind(&MediaCodecPlayer::OnMediaCryptoReady, media_weak_this_));
 }
 
 // Callbacks from Demuxer.
 
 void MediaCodecPlayer::OnDemuxerConfigsAvailable(
     const DemuxerConfigs& configs) {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   DVLOG(1) << __FUNCTION__;
 
@@ skipping 200 matching lines @@
     DCHECK(!internal_error_cb_.is_null());
     GetMediaTaskRunner()->PostTask(FROM_HERE, internal_error_cb_);
     return;
   }
 
   if (HasVideo() && !video_decoder_->HasVideoSurface()) {
     SetState(kStateWaitingForSurface);
     return;
   }
 
+  if (key_is_required_ && !key_is_added_) {
+    SetState(kStateWaitingForKey);
+    ui_task_runner_->PostTask(FROM_HERE, key_required_cb_);
+    return;
+  }
+
   SetState(kStatePlaying);
   StartPlaybackOrBrowserSeek();
 }
 
 void MediaCodecPlayer::OnPrerollDone() {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   if (state_ != kStatePlaying) {
     DVLOG(1) << __FUNCTION__ << ": in state " << AsString(state_)
              << ", ignoring";
@@ skipping 93 matching lines @@
       return;
   }
 
   // DetachListener to UI thread
   ui_task_runner_->PostTask(FROM_HERE, detach_listener_cb_);
 
   if (AudioFinished() && VideoFinished())
     ui_task_runner_->PostTask(FROM_HERE, completion_cb_);
 }
 
+void MediaCodecPlayer::OnKeyRequired(DemuxerStream::Type type) {
+  DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
+  DVLOG(1) << __FUNCTION__ << " " << type;
+
+  // Request stop and restart to pick up the key.
+  key_is_required_ = true;
+
+  if (state_ == kStatePlaying) {
+    SetState(kStateStopping);
+    RequestToStopDecoders();
+    SetPendingStart(true);
+  }
+}
+
 void MediaCodecPlayer::OnError() {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
   DVLOG(1) << __FUNCTION__;
 
   // kStateError blocks all events
   SetState(kStateError);
 
   ReleaseDecoderResources();
 
   ui_task_runner_->PostTask(FROM_HERE,
@@ skipping 63 matching lines @@
 void MediaCodecPlayer::OnVideoResolutionChanged(const gfx::Size& size) {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   DVLOG(1) << __FUNCTION__ << " " << size.width() << "x" << size.height();
 
   // Update cache and notify manager on UI thread
   ui_task_runner_->PostTask(
       FROM_HERE, base::Bind(metadata_changed_cb_, kNoTimestamp(), size));
 }
 
+// Callbacks from DRM
+
+void MediaCodecPlayer::OnMediaCryptoReady(
+    MediaDrmBridge::JavaObjectPtr media_crypto) {
+  DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
+  DVLOG(1) << __FUNCTION__;
+
+  // We receive the MediaCrypto global reference with this callback and use it
+  // later for all subsequent configurations. This is possible only if the
+  // MediaCrypto object remains valid until new SetCdm() is called.
+
+  DCHECK(media_crypto);
+  DCHECK(!media_crypto->is_null());
+
+  DCHECK(drm_bridge_);
+  drm_bridge_->SetMediaCryptoReadyCB(MediaDrmBridge::MediaCryptoReadyCB());

[Tima Vaisburd, 2015/09/22 19:41:23]

MediaDrmBridge does ResetAndReturn before sending this callback, it seems safe
to remove this call, thus eliminating the second call to SetMediaCryptoReadyCB
on Media thread.

+
+  media_crypto_ = media_crypto.Pass();
+
+  if (state_ == kStateWaitingForCrypto) {
+    // Resume start sequence (configure, etc.)
+    SetState(kStatePlaying);
+    StartPlaybackOrBrowserSeek();
+  }
+
+  DVLOG(1) << __FUNCTION__ << " end";
+}
+
+void MediaCodecPlayer::OnKeyAdded() {
+  DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
+  DVLOG(1) << __FUNCTION__;
+
+  key_is_added_ = true;
+
+  if (state_ == kStateWaitingForKey) {
+    SetState(kStatePlaying);
+    StartPlaybackOrBrowserSeek();
+  }
+}
+
+void MediaCodecPlayer::OnCdmUnset() {
+  DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
+  DVLOG(1) << __FUNCTION__;
+
+  // This comment is copied from MediaSourcePlayer::OnCdmUnset().
+  // TODO(xhwang): Currently this is only called during teardown. Support full
+  // detachment of CDM during playback. This will be needed when we start to
+  // support setMediaKeys(0) (see http://crbug.com/330324), or when we release
+  // MediaDrm when the video is paused, or when the device goes to sleep (see
+  // http://crbug.com/272421).
+
+  if (audio_decoder_)
+    audio_decoder_->SetDrmBridge(nullptr);
+  if (video_decoder_)
+    video_decoder_->SetDrmBridge(nullptr);
+
+  cdm_registration_id_ = 0;
+  drm_bridge_ = nullptr;
+  media_crypto_.reset();
+}
+
 // State machine operations, called on Media thread
 
 void MediaCodecPlayer::SetState(PlayerState new_state) {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   DVLOG(1) << "SetState:" << AsString(state_) << " -> " << AsString(new_state);
   state_ = new_state;
 }
 
 void MediaCodecPlayer::SetPendingStart(bool need_to_start) {
@@ skipping 79 matching lines @@
     video_decoder_->Prefetch(prefetch_cb);
 }
 
 void MediaCodecPlayer::StartPlaybackOrBrowserSeek() {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
   DVLOG(1) << __FUNCTION__;
 
   // TODO(timav): consider replacing this method with posting a
   // browser seek task (i.e. generate an event) from StartPlaybackDecoders().
 
+  // Clear encryption key related flags.
+  key_is_required_ = false;
+  key_is_added_ = false;
+
   StartStatus status = StartPlaybackDecoders();
 
   switch (status) {
     case kStartBrowserSeekRequired:
       // Browser seek
       SetState(kStateWaitingForSeek);
       SetPendingStart(true);
       StopDecoders();
       RequestDemuxerSeek(GetInterpolatedTime(), true);
       break;
+    case kStartCryptoRequired:
+      SetState(kStateWaitingForCrypto);
+      break;
     case kStartFailed:
       GetMediaTaskRunner()->PostTask(FROM_HERE, internal_error_cb_);
       break;
     case kStartOk:
       break;
   }
 }
 
 MediaCodecPlayer::StartStatus MediaCodecPlayer::StartPlaybackDecoders() {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
@@ skipping 17 matching lines @@
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
   DVLOG(1) << __FUNCTION__;
 
   const bool do_audio = !AudioFinished();
   const bool do_video = !VideoFinished();
 
   // If there is nothing to play, the state machine should determine this at the
   // prefetch state and never call this method.
   DCHECK(do_audio || do_video);
 
-  // Start with video: if browser seek is required it would
-  // not make sense to configure audio.
+  bool need_crypto = (do_audio && audio_decoder_->IsContentEncrypted()) ||
+                     (do_video && video_decoder_->IsContentEncrypted());
 
-  if (do_video) {
-    MediaCodecDecoder::ConfigStatus status = video_decoder_->Configure();
-    switch (status) {
-      case MediaCodecDecoder::kConfigOk:
-        break;
-      case MediaCodecDecoder::kConfigKeyFrameRequired:
-        // TODO(timav): post a task or return the status?
-        return kStartBrowserSeekRequired;
-      case MediaCodecDecoder::kConfigFailure:
-        return kStartFailed;
+  // Do we need to create a local ref from the global ref?
+  jobject media_crypto = media_crypto_ ? media_crypto_->obj() : nullptr;
+
+  if (need_crypto) {
+    DVLOG(1) << (audio_decoder_->IsContentEncrypted() ? " audio" : "")
+             << (video_decoder_->IsContentEncrypted() ? " video" : "")
+             << " need(s) encryption";
+    if (!media_crypto) {
+      DVLOG(1) << __FUNCTION__ << ": MediaCrypto is not found, returning";
+      return kStartCryptoRequired;
     }
   }
 
-  if (do_audio) {
-    MediaCodecDecoder::ConfigStatus status = audio_decoder_->Configure();
-    if (status != MediaCodecDecoder::kConfigOk) {
+  // Start with video: if browser seek is required it would not make sense to
+  // configure audio.
+
+  MediaCodecDecoder::ConfigStatus status = MediaCodecDecoder::kConfigOk;
+  if (do_video)
+    status = video_decoder_->Configure(media_crypto);
+
+  if (status == MediaCodecDecoder::kConfigOk && do_audio)
+    status = audio_decoder_->Configure(media_crypto);
+
+  switch (status) {
+    case MediaCodecDecoder::kConfigOk:
+      break;
+    case MediaCodecDecoder::kConfigKeyFrameRequired:
+      return kStartBrowserSeekRequired;
+    case MediaCodecDecoder::kConfigNoCrypto:  // TODO: delete this
+      return kStartCryptoRequired;
+    case MediaCodecDecoder::kConfigFailure:
       return kStartFailed;
-    }
   }
-
   return kStartOk;
 }
 
 MediaCodecPlayer::StartStatus MediaCodecPlayer::MaybePrerollDecoders(
     bool* preroll_required) {
   DCHECK(GetMediaTaskRunner()->BelongsToCurrentThread());
 
   DVLOG(1) << __FUNCTION__ << " current_time:" << GetInterpolatedTime();
 
   // If requested, preroll is always done in the beginning of the playback,
@@ skipping 138 matching lines @@
 
   audio_decoder_.reset(new MediaCodecAudioDecoder(
       GetMediaTaskRunner(), base::Bind(&MediaCodecPlayer::RequestDemuxerData,
                                        media_weak_this_, DemuxerStream::AUDIO),
       base::Bind(&MediaCodecPlayer::OnStarvation, media_weak_this_,
                  DemuxerStream::AUDIO),
       base::Bind(&MediaCodecPlayer::OnDecoderDrained, media_weak_this_,
                  DemuxerStream::AUDIO),
       base::Bind(&MediaCodecPlayer::OnStopDone, media_weak_this_,
                  DemuxerStream::AUDIO),
+      base::Bind(&MediaCodecPlayer::OnKeyRequired, media_weak_this_,
+                 DemuxerStream::AUDIO),
       internal_error_cb_,
       base::Bind(&MediaCodecPlayer::OnTimeIntervalUpdate, media_weak_this_,
                  DemuxerStream::AUDIO)));
 
   video_decoder_.reset(new MediaCodecVideoDecoder(
       GetMediaTaskRunner(), base::Bind(&MediaCodecPlayer::RequestDemuxerData,
                                        media_weak_this_, DemuxerStream::VIDEO),
       base::Bind(&MediaCodecPlayer::OnStarvation, media_weak_this_,
                  DemuxerStream::VIDEO),
       base::Bind(&MediaCodecPlayer::OnDecoderDrained, media_weak_this_,
                  DemuxerStream::VIDEO),
       base::Bind(&MediaCodecPlayer::OnStopDone, media_weak_this_,
                  DemuxerStream::VIDEO),
+      base::Bind(&MediaCodecPlayer::OnKeyRequired, media_weak_this_,
+                 DemuxerStream::VIDEO),
       internal_error_cb_,
       base::Bind(&MediaCodecPlayer::OnTimeIntervalUpdate, media_weak_this_,
                  DemuxerStream::VIDEO),
       base::Bind(&MediaCodecPlayer::OnVideoResolutionChanged, media_weak_this_),
       base::Bind(&MediaCodecPlayer::OnVideoCodecCreated, media_weak_this_)));
 }
 
 bool MediaCodecPlayer::AudioFinished() const {
   return audio_decoder_->IsCompleted() || !audio_decoder_->HasStream();
 }
@@ skipping 15 matching lines @@
     return #x;
 
 const char* MediaCodecPlayer::AsString(PlayerState state) {
   switch (state) {
     RETURN_STRING(kStatePaused);
     RETURN_STRING(kStateWaitingForConfig);
     RETURN_STRING(kStatePrefetching);
     RETURN_STRING(kStatePlaying);
     RETURN_STRING(kStateStopping);
     RETURN_STRING(kStateWaitingForSurface);
+    RETURN_STRING(kStateWaitingForKey);
+    RETURN_STRING(kStateWaitingForCrypto);
     RETURN_STRING(kStateWaitingForSeek);
     RETURN_STRING(kStateError);
   }
   return nullptr;  // crash early
 }
 
 #undef RETURN_STRING
 
 }  // namespace media