Prepare MediaDrmBridge to work with MediaCodecPlayer

media/base/android/media_drm_bridge.cc

Index: media/base/android/media_drm_bridge.cc
diff --git a/media/base/android/media_drm_bridge.cc b/media/base/android/media_drm_bridge.cc
index 14bdbda03f0ac81e2f32ea958d02103f3b91e3d1..bbb158864e0292b6d22225a8dd332d3857efa1ac 100644
--- a/media/base/android/media_drm_bridge.cc
+++ b/media/base/android/media_drm_bridge.cc
@@ -9,7 +9,9 @@
 #include "base/android/build_info.h"
 #include "base/android/jni_array.h"
 #include "base/android/jni_string.h"
+#include "base/bind.h"
 #include "base/callback_helpers.h"
+#include "base/command_line.h"
 #include "base/containers/hash_tables.h"
 #include "base/lazy_instance.h"
 #include "base/location.h"
@@ -23,11 +25,24 @@
 #include "base/thread_task_runner_handle.h"
 #include "jni/MediaDrmBridge_jni.h"
 #include "media/base/android/media_client_android.h"
+#include "media/base/android/media_codec_player.h"  // for GetMediaTaskRunner()
 #include "media/base/android/media_drm_bridge_delegate.h"
 #include "media/base/cdm_key_information.h"
+#include "media/base/media_switches.h"
 
 #include "widevine_cdm_version.h"  // In SHARED_INTERMEDIATE_DIR.
 
+#define RUN_CB_ON_MEDIA_THREAD(cb, ...)                              \
+  do {                                                               \
+    if (use_media_thread_ &&                                         \
+        !GetMediaTaskRunner()->BelongsToCurrentThread()) {           \
+      GetMediaTaskRunner()->PostTask(FROM_HERE,                      \
+                                     base::Bind(cb, ##__VA_ARGS__)); \
+    } else {                                                         \
+      cb.Run(__VA_ARGS__);                                           \
+    }                                                                \
+  } while (0)
+
 using base::android::AttachCurrentThread;
 using base::android::ConvertUTF8ToJavaString;
 using base::android::ConvertJavaStringToUTF8;
@@ -254,6 +269,7 @@ bool MediaDrmBridge::IsKeySystemSupportedWithType(
   return IsKeySystemSupportedWithTypeImpl(key_system, container_mime_type);
 }
 
+// static
 bool MediaDrmBridge::RegisterMediaDrmBridge(JNIEnv* env) {
   return RegisterNativesImpl(env);
 }
@@ -270,7 +286,20 @@ MediaDrmBridge::MediaDrmBridge(
       session_closed_cb_(session_closed_cb),
       legacy_session_error_cb_(legacy_session_error_cb),
       session_keys_change_cb_(session_keys_change_cb),
-      session_expiration_update_cb_(session_expiration_update_cb) {
+      session_expiration_update_cb_(session_expiration_update_cb),
+      use_media_thread_(false),
+      destruction_started_(false),
+      weak_factory_(this) {
+  DVLOG(1) << "MediaDrmBridge::MediaDrmBridge";
+
+  use_media_thread_ = base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kEnableMediaThreadForMediaPlayback);
+
+  base::WeakPtr<MediaDrmBridge> weak_this = weak_factory_.GetWeakPtr();
+
+  internal_keys_added_cb_ =
+      base::Bind(&MediaDrmBridge::InternalKeysAdded, weak_this);
+
   JNIEnv* env = AttachCurrentThread();
   CHECK(env);
 
@@ -280,22 +309,44 @@ MediaDrmBridge::MediaDrmBridge(
       env, j_scheme_uuid.obj(), reinterpret_cast<intptr_t>(this)));
 }
 
-MediaDrmBridge::~MediaDrmBridge() {
+void MediaDrmBridge::DeleteOnCorrectThread() {
+  DVLOG(1) << "MediaDrmBridge::" << __FUNCTION__;
+
+  // Prevent GetMediaCrypro() to be called from this point.
+  // TODO(timav): need a better way.

[Tima Vaisburd, 2015/09/18 00:41:38]

I will try to eliminate this lock in the next patch. The plan is to take the
media crypto with the callback and not call GetMediaCrypto at all.

+  {
+    base::AutoLock lock(destruction_started_lock_);
+    destruction_started_ = true;
+  }
+
   JNIEnv* env = AttachCurrentThread();
-  player_tracker_.NotifyCdmUnset();
   if (!j_media_drm_.is_null())
     Java_MediaDrmBridge_destroy(env, j_media_drm_.obj());
+
+  // Post deletion onto Media thread if we use it.
+  if (use_media_thread_)
+    GetMediaTaskRunner()->DeleteSoon(FROM_HERE, this);
+  else
+    delete this;
+}
+
+MediaDrmBridge::~MediaDrmBridge() {
+  DVLOG(1) << "MediaDrmBridge::" << __FUNCTION__;
+
+  DCHECK(use_media_thread_ && GetMediaTaskRunner()->BelongsToCurrentThread());
+
+  player_tracker_.NotifyCdmUnset();
 }
 
 // static
-scoped_ptr<MediaDrmBridge> MediaDrmBridge::Create(
+scoped_ptr<MediaDrmBridge, BrowserCdmDeleter> MediaDrmBridge::Create(
     const std::string& key_system,
     const SessionMessageCB& session_message_cb,
     const SessionClosedCB& session_closed_cb,
     const LegacySessionErrorCB& legacy_session_error_cb,
     const SessionKeysChangeCB& session_keys_change_cb,
     const SessionExpirationUpdateCB& session_expiration_update_cb) {
-  scoped_ptr<MediaDrmBridge> media_drm_bridge;
+  scoped_ptr<MediaDrmBridge, BrowserCdmDeleter> media_drm_bridge;
   if (!IsAvailable())
     return media_drm_bridge.Pass();
 
@@ -315,8 +366,8 @@ scoped_ptr<MediaDrmBridge> MediaDrmBridge::Create(
 }
 
 // static
-scoped_ptr<MediaDrmBridge> MediaDrmBridge::CreateWithoutSessionSupport(
-    const std::string& key_system) {
+scoped_ptr<MediaDrmBridge, BrowserCdmDeleter>
+MediaDrmBridge::CreateWithoutSessionSupport(const std::string& key_system) {
   return MediaDrmBridge::Create(
       key_system, SessionMessageCB(), SessionClosedCB(), LegacySessionErrorCB(),
       SessionKeysChangeCB(), SessionExpirationUpdateCB());
@@ -464,14 +515,19 @@ CdmContext* MediaDrmBridge::GetCdmContext() {
 
 int MediaDrmBridge::RegisterPlayer(const base::Closure& new_key_cb,
                                    const base::Closure& cdm_unset_cb) {
+  DCHECK(use_media_thread_ && GetMediaTaskRunner()->BelongsToCurrentThread());
   return player_tracker_.RegisterPlayer(new_key_cb, cdm_unset_cb);
 }
 
 void MediaDrmBridge::UnregisterPlayer(int registration_id) {
+  DCHECK(use_media_thread_ && GetMediaTaskRunner()->BelongsToCurrentThread());
   player_tracker_.UnregisterPlayer(registration_id);
 }
 
 void MediaDrmBridge::SetMediaCryptoReadyCB(const base::Closure& closure) {
+  DCHECK(use_media_thread_ && GetMediaTaskRunner()->BelongsToCurrentThread());
+  DVLOG(1) << "MediaDrmBridge::" << __FUNCTION__;
+
   if (closure.is_null()) {
     media_crypto_ready_cb_.Reset();
     return;
@@ -487,10 +543,16 @@ void MediaDrmBridge::SetMediaCryptoReadyCB(const base::Closure& closure) {
   media_crypto_ready_cb_ = closure;
 }
 
-void MediaDrmBridge::OnMediaCryptoReady(JNIEnv* env, jobject) {
+void MediaDrmBridge::OnMediaCryptoReady(JNIEnv* env, jobject j_media_drm) {
+  DVLOG(1) << "MediaDrmBridge::" << __FUNCTION__;
+
   DCHECK(!GetMediaCrypto().is_null());
-  if (!media_crypto_ready_cb_.is_null())
-    base::ResetAndReturn(&media_crypto_ready_cb_).Run();
+
+  if (media_crypto_ready_cb_.is_null())
+    return;
+
+  // TODO(timav): shall we pass the MediaCrypto object with the callback?
+  RUN_CB_ON_MEDIA_THREAD(base::ResetAndReturn(&media_crypto_ready_cb_));
 }
 
 void MediaDrmBridge::OnPromiseResolved(JNIEnv* env,
@@ -544,8 +606,7 @@ void MediaDrmBridge::OnSessionKeysChange(JNIEnv* env,
                                          jbyteArray j_session_id,
                                          jobjectArray j_keys_info,
                                          bool has_additional_usable_key) {
-  if (has_additional_usable_key)
-    player_tracker_.NotifyNewKey();
+  DVLOG(1) << "MediaDrmBridge::" << __FUNCTION__;
 
   CdmKeysInfo cdm_keys_info;
 
@@ -579,8 +640,18 @@ void MediaDrmBridge::OnSessionKeysChange(JNIEnv* env,
     cdm_keys_info.push_back(cdm_key_information.release());
   }
 
-  session_keys_change_cb_.Run(GetSessionId(env, j_session_id),
-                              has_additional_usable_key, cdm_keys_info.Pass());
+  RUN_CB_ON_MEDIA_THREAD(internal_keys_added_cb_, has_additional_usable_key);
+
+  std::string session_id = GetSessionId(env, j_session_id);
+
+  session_keys_change_cb_.Run(session_id, has_additional_usable_key,
+                              cdm_keys_info.Pass());
+}
+
+void MediaDrmBridge::InternalKeysAdded(bool has_additional_usable_key) {
+  DCHECK(use_media_thread_ && GetMediaTaskRunner()->BelongsToCurrentThread());
+  if (has_additional_usable_key)
+    player_tracker_.NotifyNewKey();
 }
 
 // According to MeidaDrm documentation [1], zero |expiry_time_ms| means the keys
@@ -613,6 +684,10 @@ void MediaDrmBridge::OnLegacySessionError(JNIEnv* env,
 }
 
 ScopedJavaLocalRef<jobject> MediaDrmBridge::GetMediaCrypto() {
+  base::AutoLock lock(destruction_started_lock_);
+  if (destruction_started_)
+    return ScopedJavaLocalRef<jobject>();
+
   JNIEnv* env = AttachCurrentThread();
   return Java_MediaDrmBridge_getMediaCrypto(env, j_media_drm_.obj());
 }