The Tor Browser: content/media/directshow/SampleSink.h@ca08bd8f51b2

     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/. */

     7 #if !defined(SampleSink_h_)

     8 #define SampleSink_h_

    10 #include "BaseFilter.h"

    11 #include "DirectShowUtils.h"

    12 #include "nsAutoPtr.h"

    13 #include "mozilla/RefPtr.h"

    14 #include "mozilla/ReentrantMonitor.h"

    16 namespace mozilla {

    18 class SampleSink {

    19 public:

    20   SampleSink();

    21   virtual ~SampleSink();

    23   // Sets the audio format of the incoming samples. The upstream filter

    24   // calls this. This makes a copy.

    25   void SetAudioFormat(const WAVEFORMATEX* aInFormat);

    27   // Copies the format of incoming audio samples into into *aOutFormat.

    28   void GetAudioFormat(WAVEFORMATEX* aOutFormat);

    30   // Called when a sample is delivered by the DirectShow graph to the sink.

    31   // The decode thread retrieves the sample by calling WaitForSample().

    32   // Blocks if there's already a sample waiting to be consumed by the decode

    33   // thread.

    34   HRESULT Receive(IMediaSample* aSample);

    36   // Retrieves a sample from the sample queue, blocking until one becomes

    37   // available, or until an error occurs. Returns S_FALSE on EOS.

    38   HRESULT Extract(RefPtr<IMediaSample>& aOutSample);

    40   // Unblocks any threads waiting in GetSample().

    41   // Clears mSample, which unblocks upstream stream.

    42   void Flush();

    44   // Opens up the sink to receive more samples in PutSample().

    45   // Clears EOS flag.

    46   void Reset();

    48   // Marks that we've reacehd the end of stream.

    49   void SetEOS();

    51   // Returns whether we're at end of stream.

    52   bool AtEOS();

    54 private:

    55   // All data in this class is syncronized by mMonitor.

    56   ReentrantMonitor mMonitor;

    57   RefPtr<IMediaSample> mSample;

    59   // Format of the audio stream we're receiving.

    60   WAVEFORMATEX mAudioFormat;

    62   bool mIsFlushing;

    63   bool mAtEOS;

    64 };

    66 } // namespace mozilla

    67 #endif // SampleSink_h_

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