The Tor Browser: content/media/wmf/WMFSourceReaderCallback.h@44a2da4a2ab2

Replace accessor implementation with direct member state manipulation, by
request https://trac.torproject.org/projects/tor/ticket/9701#comment:32

     1 /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

     2 /* vim:set ts=2 sw=2 sts=2 et cindent: */

     3 /* This Source Code Form is subject to the terms of the Mozilla Public

     4  * License, v. 2.0. If a copy of the MPL was not distributed with this

     5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #if !defined(WMFSourceReaderCallback_h_)

     7 #define WMFSourceReaderCallback_h_

     9 #include "WMF.h"

    10 #include "mozilla/ReentrantMonitor.h"

    11 #include "mozilla/RefPtr.h"

    12 #include "nsISupportsImpl.h"

    14 namespace mozilla {

    16 // A listener which we pass into the IMFSourceReader upon creation which is

    17 // notified when an asynchronous call to IMFSourceReader::ReadSample()

    18 // completes. This allows us to abort ReadSample() operations when the

    19 // WMFByteStream's underlying MediaResource is closed. This ensures that

    20 // the decode threads don't get stuck in a synchronous ReadSample() call

    21 // when the MediaResource is unexpectedly shutdown.

    22 class WMFSourceReaderCallback MOZ_FINAL : public IMFSourceReaderCallback

    23 {

    24 public:

    25   WMFSourceReaderCallback();

    27   // IUnknown Methods.

    28   STDMETHODIMP QueryInterface(REFIID aIId, LPVOID *aInterface);

    29   STDMETHODIMP_(ULONG) AddRef();

    30   STDMETHODIMP_(ULONG) Release();

    32   // IMFSourceReaderCallback methods

    33   STDMETHODIMP OnReadSample(HRESULT hrStatus,

    34                             DWORD dwStreamIndex,

    35                             DWORD dwStreamFlags,

    36                             LONGLONG llTimestamp,

    37                             IMFSample *pSample);

    38   STDMETHODIMP OnEvent(DWORD, IMFMediaEvent *);

    39   STDMETHODIMP OnFlush(DWORD);

    41   // Causes the calling thread to block waiting for the

    42   // IMFSourceReader::ReadSample() result callback to occur, or for the

    43   // WMFByteStream to be closed.

    44   HRESULT Wait(DWORD* aStreamFlags,

    45                LONGLONG* aTimeStamp,

    46                IMFSample** aSample);

    48   // Cancels Wait() calls.

    49   HRESULT Cancel();

    51 private:

    53   // Sets state to record the result of a read, and awake threads

    54   // waiting in Wait().

    55   HRESULT NotifyReadComplete(HRESULT aReadStatus,

    56                              DWORD aStreamIndex,

    57                              DWORD aStreamFlags,

    58                              LONGLONG aTimestamp,

    59                              IMFSample *aSample);

    61   // Synchronizes all member data in this class, and Wait() blocks on

    62   // and NotifyReadComplete() notifies this monitor.

    63   ReentrantMonitor mMonitor;

    65   // Read result data.

    66   HRESULT mResultStatus;

    67   DWORD mStreamFlags;

    68   LONGLONG mTimestamp;

    69   IMFSample* mSample;

    71   // Sentinal. Set to true when a read result is returned. Wait() won't exit

    72   // until this is set to true.

    73   bool mReadFinished;

    75   // IUnknown ref counting.

    76   ThreadSafeAutoRefCnt mRefCnt;

    77   NS_DECL_OWNINGTHREAD

    79 };

    81 } // namespace mozilla

    83 #endif // WMFSourceReaderCallback_h_

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