michael@0: /* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-*/
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this file,
michael@0:  * You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: #ifndef VorbisTrackEncoder_h_
michael@0: #define VorbisTrackEncoder_h_
michael@0: 
michael@0: #include "TrackEncoder.h"
michael@0: #include "nsCOMPtr.h"
michael@0: #include <vorbis/codec.h>
michael@0: 
michael@0: namespace mozilla {
michael@0: 
michael@0: class VorbisTrackEncoder : public AudioTrackEncoder
michael@0: {
michael@0: public:
michael@0:   VorbisTrackEncoder();
michael@0:   virtual ~VorbisTrackEncoder();
michael@0: 
michael@0:   already_AddRefed<TrackMetadataBase> GetMetadata() MOZ_FINAL MOZ_OVERRIDE;
michael@0: 
michael@0:   nsresult GetEncodedTrack(EncodedFrameContainer& aData) MOZ_FINAL MOZ_OVERRIDE;
michael@0: 
michael@0: protected:
michael@0:   /**
michael@0:    * http://xiph.org/vorbis/doc/libvorbis/vorbis_analysis_buffer.html
michael@0:    * We use 1024 samples for the write buffer; libvorbis will construct packets
michael@0:    * with the appropriate duration for the encoding mode internally.
michael@0:    */
michael@0:   int GetPacketDuration() MOZ_FINAL MOZ_OVERRIDE {
michael@0:     return 1024;
michael@0:   }
michael@0: 
michael@0:   nsresult Init(int aChannels, int aSamplingRate) MOZ_FINAL MOZ_OVERRIDE;
michael@0: 
michael@0: private:
michael@0:   // Write Xiph-style lacing to aOutput.
michael@0:   void WriteLacing(nsTArray<uint8_t> *aOutput, int32_t aLacing);
michael@0: 
michael@0:   // Get the encoded data from vorbis encoder and append into aData.
michael@0:   void GetEncodedFrames(EncodedFrameContainer& aData);
michael@0: 
michael@0:   // vorbis codec members
michael@0:   // Struct that stores all the static vorbis bitstream settings.
michael@0:   vorbis_info mVorbisInfo;
michael@0:   // Central working state for the PCM->packet encoder.
michael@0:   vorbis_dsp_state mVorbisDsp;
michael@0:   // Local working space for PCM->packet encode.
michael@0:   vorbis_block mVorbisBlock;
michael@0: };
michael@0: 
michael@0: }
michael@0: #endif