The Tor Browser: content/media/encoder/VorbisTrackEncoder.h@6474c204b198

Cloned upstream origin tor-browser at tor-browser-31.3.0esr-4.5-1-build1
revision ID fc1c9ff7c1b2defdbc039f12214767608f46423f for hacking purpose.

     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 VorbisTrackEncoder_h_

     7 #define VorbisTrackEncoder_h_

     9 #include "TrackEncoder.h"

    10 #include "nsCOMPtr.h"

    11 #include <vorbis/codec.h>

    13 namespace mozilla {

    15 class VorbisTrackEncoder : public AudioTrackEncoder

    16 {

    17 public:

    18   VorbisTrackEncoder();

    19   virtual ~VorbisTrackEncoder();

    21   already_AddRefed<TrackMetadataBase> GetMetadata() MOZ_FINAL MOZ_OVERRIDE;

    23   nsresult GetEncodedTrack(EncodedFrameContainer& aData) MOZ_FINAL MOZ_OVERRIDE;

    25 protected:

    26   /**

    27    * http://xiph.org/vorbis/doc/libvorbis/vorbis_analysis_buffer.html

    28    * We use 1024 samples for the write buffer; libvorbis will construct packets

    29    * with the appropriate duration for the encoding mode internally.

    30    */

    31   int GetPacketDuration() MOZ_FINAL MOZ_OVERRIDE {

    32     return 1024;

    33   }

    35   nsresult Init(int aChannels, int aSamplingRate) MOZ_FINAL MOZ_OVERRIDE;

    37 private:

    38   // Write Xiph-style lacing to aOutput.

    39   void WriteLacing(nsTArray<uint8_t> *aOutput, int32_t aLacing);

    41   // Get the encoded data from vorbis encoder and append into aData.

    42   void GetEncodedFrames(EncodedFrameContainer& aData);

    44   // vorbis codec members

    45   // Struct that stores all the static vorbis bitstream settings.

    46   vorbis_info mVorbisInfo;

    47   // Central working state for the PCM->packet encoder.

    48   vorbis_dsp_state mVorbisDsp;

    49   // Local working space for PCM->packet encode.

    50   vorbis_block mVorbisBlock;

    51 };

    53 }

    54 #endif

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