remoting/codec/audio_encoder_opus.h

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef REMOTING_CODEC_AUDIO_ENCODER_OPUS_H_
   6 #define REMOTING_CODEC_AUDIO_ENCODER_OPUS_H_
   7
   8 #include "remoting/codec/audio_encoder.h"
   9
  10 #include "remoting/proto/audio.pb.h"
  11
  12 struct OpusEncoder;
  13
  14 namespace media {
  15 class AudioBus;
  16 class MultiChannelResampler;
  17 }  // namespace media
  18
  19 namespace remoting {
  20
  21 class AudioPacket;
  22
  23 class AudioEncoderOpus : public AudioEncoder {
  24  public:
  25   AudioEncoderOpus();
  26   ~AudioEncoderOpus() override;
  27
  28   // AudioEncoder interface.
  29   scoped_ptr<AudioPacket> Encode(scoped_ptr<AudioPacket> packet) override;
  30   int GetBitrate() override;
  31
  32  private:
  33   void InitEncoder();
  34   void DestroyEncoder();
  35   bool ResetForPacket(AudioPacket* packet);
  36
  37   void FetchBytesToResample(int resampler_frame_delay,
  38                             media::AudioBus* audio_bus);
  39
  40   int sampling_rate_;
  41   AudioPacket::Channels channels_;
  42   OpusEncoder* encoder_;
  43
  44   int frame_size_;
  45   scoped_ptr<media::MultiChannelResampler> resampler_;
  46   scoped_ptr<char[]> resample_buffer_;
  47   scoped_ptr<media::AudioBus> resampler_bus_;
  48
  49   // Used to pass packet to the FetchBytesToResampler() callback.
  50   const char* resampling_data_;
  51   int resampling_data_size_;
  52   int resampling_data_pos_;
  53
  54   // Left-over unencoded samples from the previous AudioPacket.
  55   scoped_ptr<int16[]> leftover_buffer_;
  56   int leftover_buffer_size_;
  57   int leftover_samples_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(AudioEncoderOpus);
  60 };
  61
  62 }  // namespace remoting
  63
  64 #endif  // REMOTING_CODEC_AUDIO_ENCODER_OPUS_H_