work-in-progress patch to fix context lost black video

content/renderer/media/android/webmediaplayer_android.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 "content/renderer/media/android/webmediaplayer_android.h"
 
 #include <limits>
 
 #include "base/android/build_info.h"
 #include "base/bind.h"
@@ skipping 135 matching lines @@
       is_remote_(false),
       media_log_(media_log),
       web_cdm_(NULL),
       allow_stored_credentials_(false),
       is_local_resource_(false),
       weak_factory_(this) {
   DCHECK(player_manager_);
   DCHECK(cdm_manager_);
 
   DCHECK(main_thread_checker_.CalledOnValidThread());
+  stream_texture_factory_->AddObserver(this);
 
   player_id_ = player_manager_->RegisterMediaPlayer(this);
 
 #if defined(VIDEO_HOLE)
   force_use_overlay_embedded_video_ = CommandLine::ForCurrentProcess()->
       HasSwitch(switches::kForceUseOverlayEmbeddedVideo);
   if (force_use_overlay_embedded_video_ ||
     player_manager_->ShouldUseVideoOverlayForEmbeddedEncryptedVideo()) {
     // Defer stream texture creation until we are sure it's necessary.
     needs_establish_peer_ = false;
@@ skipping 21 matching lines @@
     stream_id_ = 0;
   }
 
   {
     base::AutoLock auto_lock(current_frame_lock_);
     current_frame_ = NULL;
   }
 
   if (player_type_ == MEDIA_PLAYER_TYPE_MEDIA_SOURCE && delegate_)
     delegate_->PlayerGone(this);
+
+  stream_texture_factory_->RemoveObserver(this);
 }
 
 void WebMediaPlayerAndroid::load(LoadType load_type,
                                  const blink::WebURL& url,
                                  CORSMode cors_mode) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   ReportMediaSchemeUma(GURL(url));
 
   switch (load_type) {
     case LoadTypeURL:
@@ skipping 108 matching lines @@
       !player_manager_->IsInFullscreen(frame_)) {
     EstablishSurfaceTexturePeer();
   }
 
   if (paused())
     player_manager_->Start(player_id_);
   UpdatePlayingState(true);
   UpdateNetworkState(WebMediaPlayer::NetworkStateLoading);
 }
 
+void WebMediaPlayerAndroid::ResetStreamTextureProxy() {
+  if (stream_id_) {
+    GLES2Interface* gl = stream_texture_factory_->ContextGL();
+    gl->DeleteTextures(1, &texture_id_);
+    texture_id_ = 0;
+    texture_mailbox_ = gpu::Mailbox();
+    stream_id_ = 0;
+  }
+  stream_texture_proxy_.reset();
+  SetNeedsEstablishPeer(true);
+
+  TryCreateStreamTextureProxyIfNeeded();
+  // TODO(boliu): This is not thread safe.
+  stream_texture_proxy_initialized_ = false;
+  if (hasVideo() && needs_establish_peer_ &&

[qinmin, 2014/09/04 00:14:47]

isn't needs_establish_peer_ true since you called SetNeedsEstablishPeer(true)
above?

+      !player_manager_->IsInFullscreen(frame_)) {
+    EstablishSurfaceTexturePeer();
+  }
+
+  // TODO(boliu): Inform |video_frame_provider_client_| on compositor thread.

[qinmin, 2014/09/04 00:14:47]

you also need to bind the new stream texture proxy to the compositor thread

+}
+
 void WebMediaPlayerAndroid::pause() {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   Pause(true);
 }
 
 void WebMediaPlayerAndroid::seek(double seconds) {
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DVLOG(1) << __FUNCTION__ << "(" << seconds << ")";
 
   base::TimeDelta new_seek_time = ConvertSecondsToTimestamp(seconds);
@@ skipping 1429 matching lines @@
 
 bool WebMediaPlayerAndroid::IsHLSStream() const {
   std::string mime;
   GURL url = redirected_url_.is_empty() ? url_ : redirected_url_;
   if (!net::GetMimeTypeFromFile(base::FilePath(url.path()), &mime))
     return false;
   return !mime.compare("application/x-mpegurl");
 }
 
 }  // namespace content