libmediaplayerservice: Serialize access to AudioOutput
NuPlayerRenderer may open and close the AudioOutput while
MediaPlayerService::Client accesses it.
Bug: 20069455
Bug: 22295200
Change-Id: Ic37987c1de1919cf890b2e69778e6df71e7ee7c5
diff --git a/media/libmediaplayerservice/MediaPlayerService.h b/media/libmediaplayerservice/MediaPlayerService.h
index 7527506..9e6ca52 100644
--- a/media/libmediaplayerservice/MediaPlayerService.h
+++ b/media/libmediaplayerservice/MediaPlayerService.h
@@ -132,7 +132,8 @@
static void setMinBufferCount();
static void CallbackWrapper(
int event, void *me, void *info);
- void deleteRecycledTrack();
+ void deleteRecycledTrack_l();
+ void close_l();
sp<AudioTrack> mTrack;
sp<AudioTrack> mRecycledTrack;
@@ -148,32 +149,47 @@
AudioPlaybackRate mPlaybackRate;
uint32_t mSampleRateHz; // sample rate of the content, as set in open()
float mMsecsPerFrame;
+ size_t mFrameSize;
int mSessionId;
int mUid;
int mPid;
float mSendLevel;
int mAuxEffectId;
+ audio_output_flags_t mFlags;
+ mutable Mutex mLock;
+
+ // static variables below not protected by mutex
static bool mIsOnEmulator;
static int mMinBufferCount; // 12 for emulator; otherwise 4
- audio_output_flags_t mFlags;
// CallbackData is what is passed to the AudioTrack as the "user" data.
// We need to be able to target this to a different Output on the fly,
// so we can't use the Output itself for this.
class CallbackData {
+ friend AudioOutput;
public:
CallbackData(AudioOutput *cookie) {
mData = cookie;
mSwitching = false;
}
- AudioOutput * getOutput() { return mData;}
+ AudioOutput * getOutput() const { return mData; }
void setOutput(AudioOutput* newcookie) { mData = newcookie; }
// lock/unlock are used by the callback before accessing the payload of this object
- void lock() { mLock.lock(); }
- void unlock() { mLock.unlock(); }
- // beginTrackSwitch/endTrackSwitch are used when this object is being handed over
+ void lock() const { mLock.lock(); }
+ void unlock() const { mLock.unlock(); }
+
+ // tryBeginTrackSwitch/endTrackSwitch are used when the CallbackData is handed over
// to the next sink.
- void beginTrackSwitch() { mLock.lock(); mSwitching = true; }
+
+ // tryBeginTrackSwitch() returns true only if it obtains the lock.
+ bool tryBeginTrackSwitch() {
+ LOG_ALWAYS_FATAL_IF(mSwitching, "tryBeginTrackSwitch() already called");
+ if (mLock.tryLock() != OK) {
+ return false;
+ }
+ mSwitching = true;
+ return true;
+ }
void endTrackSwitch() {
if (mSwitching) {
mLock.unlock();
@@ -182,7 +198,7 @@
}
private:
AudioOutput * mData;
- mutable Mutex mLock;
+ mutable Mutex mLock; // a recursive mutex might make this unnecessary.
bool mSwitching;
DISALLOW_EVIL_CONSTRUCTORS(CallbackData);
};