The Tor Browser: content/media/webm/EbmlComposer.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 /* This Source Code Form is subject to the terms of the Mozilla Public

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

     4  * You can obtain one at http://mozilla.org/MPL/2.0/. */

     6 #ifndef EbmlComposer_h_

     7 #define EbmlComposer_h_

     8 #include "nsTArray.h"

     9 #include "ContainerWriter.h"

    11 namespace mozilla {

    13 /*

    14  * A WebM muxer helper for package the valid WebM format.

    15  */

    16 class EbmlComposer {

    17 public:

    18   EbmlComposer();

    19   /*

    20    * Assign the parameter which header required.

    21    */

    22   void SetVideoConfig(uint32_t aWidth, uint32_t aHeight, uint32_t aDisplayWidth,

    23                       uint32_t aDisplayHeight, float aFrameRate);

    25   void SetAudioConfig(uint32_t aSampleFreq, uint32_t aChannels,

    26                       uint32_t bitDepth);

    27   /*

    28    * Set the CodecPrivateData for writing in header.

    29    */

    30   void SetAudioCodecPrivateData(nsTArray<uint8_t>& aBufs)

    31   {

    32     mCodecPrivateData.AppendElements(aBufs);

    33   }

    34   /*

    35    * Generate the whole WebM header and output to mBuff.

    36    */

    37   void GenerateHeader();

    38   /*

    39    * Insert media encoded buffer into muxer and it would be package

    40    * into SimpleBlock. If no cluster is opened, new cluster will start for writing.

    41    */

    42   void WriteSimpleBlock(EncodedFrame* aFrame);

    43   /*

    44    * Get valid cluster data.

    45    */

    46   void ExtractBuffer(nsTArray<nsTArray<uint8_t> >* aDestBufs,

    47                      uint32_t aFlag = 0);

    48 private:

    49   // Move the metadata data to mClusterCanFlushBuffs.

    50   void FinishMetadata();

    51   // Close current cluster and move data to mClusterCanFlushBuffs.

    52   void FinishCluster();

    53   // The temporary storage for cluster data.

    54   nsTArray<nsTArray<uint8_t> > mClusterBuffs;

    55   // The storage which contain valid cluster data.

    56   nsTArray<nsTArray<uint8_t> > mClusterCanFlushBuffs;

    58   // Indicate the data types in mClusterBuffs.

    59   enum {

    60     FLUSH_NONE = 0,

    61     FLUSH_METADATA = 1 << 0,

    62     FLUSH_CLUSTER = 1 << 1

    63   };

    64   uint32_t mFlushState;

    65   // Indicate the cluster header index in mClusterBuffs.

    66   uint32_t mClusterHeaderIndex;

    67   // The cluster length position.

    68   uint64_t mClusterLengthLoc;

    69   // Audio codec specific header data.

    70   nsTArray<uint8_t> mCodecPrivateData;

    72   // The timecode of the cluster.

    73   uint64_t mClusterTimecode;

    75   // Video configuration

    76   int mWidth;

    77   int mHeight;

    78   int mDisplayWidth;

    79   int mDisplayHeight;

    80   float mFrameRate;

    81   // Audio configuration

    82   float mSampleFreq;

    83   int mBitDepth;

    84   int mChannels;

    85 };

    87 }

    88 #endif

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