gecko/dom/media/MediaManager.h

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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "MediaEngine.h"
#include "mozilla/Services.h"
#include "nsIMediaManager.h"
#include "nsHashKeys.h"
#include "nsGlobalWindow.h"
#include "nsClassHashtable.h"
#include "nsRefPtrHashtable.h"
#include "nsObserverService.h"
#include "nsPIDOMWindow.h"
#include "nsIDOMNavigatorUserMedia.h"
#include "mozilla/Attributes.h"
#include "mozilla/StaticPtr.h"
#include "prlog.h"
namespace mozilla {
#ifdef PR_LOGGING
extern PRLogModuleInfo* GetMediaManagerLog();
#define MM_LOG(msg) PR_LOG(GetMediaManagerLog(), PR_LOG_DEBUG, msg)
#else
#define MM_LOG(msg)
#endif
class GetUserMediaNotificationEvent: public nsRunnable
{
public:
enum GetUserMediaStatus {
STARTING,
STOPPING
};
GetUserMediaNotificationEvent(GetUserMediaStatus aStatus)
: mStatus(aStatus) {}
NS_IMETHOD
Run()
{
nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
if (!obs) {
NS_WARNING("Could not get the Observer service for GetUserMedia recording notification.");
return NS_ERROR_FAILURE;
}
if (mStatus) {
obs->NotifyObservers(nullptr,
"recording-device-events",
NS_LITERAL_STRING("starting").get());
} else {
obs->NotifyObservers(nullptr,
"recording-device-events",
NS_LITERAL_STRING("shutdown").get());
}
return NS_OK;
}
protected:
GetUserMediaStatus mStatus;
};
/**
* This class is an implementation of MediaStreamListener. This is used
* to Start() and Stop() the underlying MediaEngineSource when MediaStreams
* are assigned and deassigned in content.
*/
class GetUserMediaCallbackMediaStreamListener : public MediaStreamListener
{
public:
// Create in an inactive state
GetUserMediaCallbackMediaStreamListener(nsIThread *aThread,
uint64_t aWindowID)
: mMediaThread(aThread)
, mWindowID(aWindowID)
, mFinished(false)
, mLock("mozilla::GUMCMSL")
, mRemoved(false) {}
~GetUserMediaCallbackMediaStreamListener()
{
// It's OK to release mStream on any thread; they have thread-safe
// refcounts.
}
void Activate(already_AddRefed<SourceMediaStream> aStream,
MediaEngineSource* aAudioSource,
MediaEngineSource* aVideoSource)
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
mStream = aStream; // also serves as IsActive();
mAudioSource = aAudioSource;
mVideoSource = aVideoSource;
mLastEndTimeAudio = 0;
mLastEndTimeVideo = 0;
mStream->AddListener(this);
}
MediaStream *Stream()
{
return mStream;
}
SourceMediaStream *GetSourceStream()
{
NS_ASSERTION(mStream,"Getting stream from never-activated GUMCMSListener");
if (!mStream) {
return nullptr;
}
return mStream->AsSourceStream();
}
// implement in .cpp to avoid circular dependency with MediaOperationRunnable
// Can be invoked from EITHER MainThread or MSG thread
void Invalidate();
void
Remove()
{
NS_ASSERTION(NS_IsMainThread(), "Only call on main thread");
// allow calling even if inactive (!mStream) for easier cleanup
// Caller holds strong reference to us, so no death grip required
MutexAutoLock lock(mLock); // protect access to mRemoved
if (mStream && !mRemoved) {
MM_LOG(("Listener removed on purpose, mFinished = %d", (int) mFinished));
mRemoved = true; // RemoveListener is async, avoid races
mStream->RemoveListener(this);
}
}
// Proxy NotifyPull() to sources
virtual void
NotifyPull(MediaStreamGraph* aGraph, StreamTime aDesiredTime) MOZ_OVERRIDE
{
// Currently audio sources ignore NotifyPull, but they could
// watch it especially for fake audio.
if (mAudioSource) {
mAudioSource->NotifyPull(aGraph, mStream, kAudioTrack, aDesiredTime, mLastEndTimeAudio);
}
if (mVideoSource) {
mVideoSource->NotifyPull(aGraph, mStream, kVideoTrack, aDesiredTime, mLastEndTimeVideo);
}
}
virtual void
NotifyFinished(MediaStreamGraph* aGraph) MOZ_OVERRIDE;
virtual void
NotifyRemoved(MediaStreamGraph* aGraph) MOZ_OVERRIDE;
private:
// Set at construction
nsCOMPtr<nsIThread> mMediaThread;
uint64_t mWindowID;
// Set at Activate on MainThread
// Accessed from MediaStreamGraph thread, MediaManager thread, and MainThread
// No locking needed as they're only addrefed except on the MediaManager thread
nsRefPtr<MediaEngineSource> mAudioSource; // threadsafe refcnt
nsRefPtr<MediaEngineSource> mVideoSource; // threadsafe refcnt
nsRefPtr<SourceMediaStream> mStream; // threadsafe refcnt
TrackTicks mLastEndTimeAudio;
TrackTicks mLastEndTimeVideo;
bool mFinished;
// Accessed from MainThread and MSG thread
Mutex mLock; // protects mRemoved access from MainThread
bool mRemoved;
};
typedef enum {
MEDIA_START,
MEDIA_STOP
} MediaOperation;
// Generic class for running long media operations like Start off the main
// thread, and then (because nsDOMMediaStreams aren't threadsafe),
// ProxyReleases mStream since it's cycle collected.
class MediaOperationRunnable : public nsRunnable
{
public:
// so we can send Stop without AddRef()ing from the MSG thread
MediaOperationRunnable(MediaOperation aType,
GetUserMediaCallbackMediaStreamListener* aListener,
MediaEngineSource* aAudioSource,
MediaEngineSource* aVideoSource,
bool aNeedsFinish)
: mType(aType)
, mAudioSource(aAudioSource)
, mVideoSource(aVideoSource)
, mListener(aListener)
, mFinish(aNeedsFinish)
{}
~MediaOperationRunnable()
{
// MediaStreams can be released on any thread.
}
NS_IMETHOD
Run()
{
SourceMediaStream *source = mListener->GetSourceStream();
// No locking between these is required as all the callbacks for the
// same MediaStream will occur on the same thread.
if (!source) // means the stream was never Activated()
return NS_OK;
switch (mType) {
case MEDIA_START:
{
NS_ASSERTION(!NS_IsMainThread(), "Never call on main thread");
nsresult rv;
source->SetPullEnabled(true);
if (mAudioSource) {
rv = mAudioSource->Start(source, kAudioTrack);
if (NS_FAILED(rv)) {
MM_LOG(("Starting audio failed, rv=%d",rv));
}
}
if (mVideoSource) {
rv = mVideoSource->Start(source, kVideoTrack);
if (NS_FAILED(rv)) {
MM_LOG(("Starting video failed, rv=%d",rv));
}
}
MM_LOG(("started all sources"));
nsRefPtr<GetUserMediaNotificationEvent> event =
new GetUserMediaNotificationEvent(GetUserMediaNotificationEvent::STARTING);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
break;
case MEDIA_STOP:
{
NS_ASSERTION(!NS_IsMainThread(), "Never call on main thread");
if (mAudioSource) {
mAudioSource->Stop(source, kAudioTrack);
mAudioSource->Deallocate();
}
if (mVideoSource) {
mVideoSource->Stop(source, kVideoTrack);
mVideoSource->Deallocate();
}
// Do this after stopping all tracks with EndTrack()
if (mFinish) {
source->Finish();
}
// the TrackUnion destination of the port will autofinish
nsRefPtr<GetUserMediaNotificationEvent> event =
new GetUserMediaNotificationEvent(GetUserMediaNotificationEvent::STOPPING);
NS_DispatchToMainThread(event, NS_DISPATCH_NORMAL);
}
break;
default:
MOZ_ASSERT(false,"invalid MediaManager operation");
break;
}
return NS_OK;
}
private:
MediaOperation mType;
nsRefPtr<MediaEngineSource> mAudioSource; // threadsafe
nsRefPtr<MediaEngineSource> mVideoSource; // threadsafe
nsRefPtr<GetUserMediaCallbackMediaStreamListener> mListener; // threadsafe
bool mFinish;
};
typedef nsTArray<nsRefPtr<GetUserMediaCallbackMediaStreamListener> > StreamListeners;
typedef nsClassHashtable<nsUint64HashKey, StreamListeners> WindowTable;
class MediaDevice : public nsIMediaDevice
{
public:
NS_DECL_ISUPPORTS
NS_DECL_NSIMEDIADEVICE
MediaDevice(MediaEngineVideoSource* aSource) {
mSource = aSource;
mType.Assign(NS_LITERAL_STRING("video"));
mSource->GetName(mName);
mSource->GetUUID(mID);
}
MediaDevice(MediaEngineAudioSource* aSource) {
mSource = aSource;
mType.Assign(NS_LITERAL_STRING("audio"));
mSource->GetName(mName);
mSource->GetUUID(mID);
}
virtual ~MediaDevice() {}
MediaEngineSource* GetSource();
private:
nsString mName;
nsString mType;
nsString mID;
nsRefPtr<MediaEngineSource> mSource;
};
class MediaManager MOZ_FINAL : public nsIMediaManagerService,
public nsIObserver
{
public:
static already_AddRefed<MediaManager> GetInstance();
static MediaManager* Get() {
if (!sSingleton) {
sSingleton = new MediaManager();
NS_NewThread(getter_AddRefs(sSingleton->mMediaThread));
MM_LOG(("New Media thread for gum"));
NS_ASSERTION(NS_IsMainThread(), "Only create MediaManager on main thread");
nsCOMPtr<nsIObserverService> obs = services::GetObserverService();
obs->AddObserver(sSingleton, "xpcom-shutdown", false);
obs->AddObserver(sSingleton, "getUserMedia:response:allow", false);
obs->AddObserver(sSingleton, "getUserMedia:response:deny", false);
obs->AddObserver(sSingleton, "getUserMedia:revoke", false);
}
return sSingleton;
}
static nsIThread* GetThread() {
return Get()->mMediaThread;
}
NS_DECL_ISUPPORTS
NS_DECL_NSIOBSERVER
NS_DECL_NSIMEDIAMANAGERSERVICE
MediaEngine* GetBackend();
StreamListeners *GetWindowListeners(uint64_t aWindowId) {
NS_ASSERTION(NS_IsMainThread(), "Only access windowlist on main thread");
return mActiveWindows.Get(aWindowId);
}
void RemoveWindowID(uint64_t aWindowId) {
mActiveWindows.Remove(aWindowId);
}
bool IsWindowStillActive(uint64_t aWindowId) {
return !!GetWindowListeners(aWindowId);
}
// Note: also calls aListener->Remove(), even if inactive
void RemoveFromWindowList(uint64_t aWindowID,
GetUserMediaCallbackMediaStreamListener *aListener);
nsresult GetUserMedia(bool aPrivileged, nsPIDOMWindow* aWindow,
nsIMediaStreamOptions* aParams,
nsIDOMGetUserMediaSuccessCallback* onSuccess,
nsIDOMGetUserMediaErrorCallback* onError);
nsresult GetUserMediaDevices(nsPIDOMWindow* aWindow,
nsIGetUserMediaDevicesSuccessCallback* onSuccess,
nsIDOMGetUserMediaErrorCallback* onError);
void OnNavigation(uint64_t aWindowID);
private:
WindowTable *GetActiveWindows() {
NS_ASSERTION(NS_IsMainThread(), "Only access windowlist on main thread");
return &mActiveWindows;
}
// Make private because we want only one instance of this class
MediaManager()
: mMediaThread(nullptr)
, mMutex("mozilla::MediaManager")
, mBackend(nullptr) {
mActiveWindows.Init();
mActiveCallbacks.Init();
}
~MediaManager() {
delete mBackend;
}
// ONLY access from MainThread so we don't need to lock
WindowTable mActiveWindows;
nsRefPtrHashtable<nsStringHashKey, nsRunnable> mActiveCallbacks;
// Always exists
nsCOMPtr<nsIThread> mMediaThread;
Mutex mMutex;
// protected with mMutex:
MediaEngine* mBackend;
static StaticRefPtr<MediaManager> sSingleton;
};
} // namespace mozilla