webrtc/modules/audio_processing/audio_buffer.h

/*
 *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#ifndef WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_AUDIO_BUFFER_H_
#define WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_AUDIO_BUFFER_H_

#include "webrtc/modules/interface/module_common_types.h"
#include "webrtc/system_wrappers/interface/scoped_ptr.h"
#include "webrtc/typedefs.h"

namespace webrtc {

struct AudioChannel;
struct SplitAudioChannel;

class AudioBuffer {
 public:
  AudioBuffer(int max_num_channels, int samples_per_channel);
  virtual ~AudioBuffer();

  int num_channels() const;
  int samples_per_channel() const;
  int samples_per_split_channel() const;

  int16_t* data(int channel) const;
  int16_t* low_pass_split_data(int channel) const;
  int16_t* high_pass_split_data(int channel) const;
  int16_t* mixed_data(int channel) const;
  int16_t* mixed_low_pass_data(int channel) const;
  int16_t* low_pass_reference(int channel) const;

  int32_t* analysis_filter_state1(int channel) const;
  int32_t* analysis_filter_state2(int channel) const;
  int32_t* synthesis_filter_state1(int channel) const;
  int32_t* synthesis_filter_state2(int channel) const;

  void set_activity(AudioFrame::VADActivity activity);
  AudioFrame::VADActivity activity() const;

  bool is_muted() const;

  void DeinterleaveFrom(AudioFrame* audioFrame);
  void InterleaveTo(AudioFrame* audioFrame) const;
  // If |data_changed| is false, only the non-audio data members will be copied
  // to |frame|.
  void InterleaveTo(AudioFrame* frame, bool data_changed) const;
  void Mix(int num_mixed_channels);
  void CopyAndMix(int num_mixed_channels);
  void CopyAndMixLowPass(int num_mixed_channels);
  void CopyLowPassToReference();

 private:
  const int max_num_channels_;
  int num_channels_;
  int num_mixed_channels_;
  int num_mixed_low_pass_channels_;
  // Whether the original data was replaced with mixed data.
  bool data_was_mixed_;
  const int samples_per_channel_;
  int samples_per_split_channel_;
  bool reference_copied_;
  AudioFrame::VADActivity activity_;
  bool is_muted_;

  int16_t* data_;
  scoped_array<AudioChannel> channels_;
  scoped_array<SplitAudioChannel> split_channels_;
  scoped_array<AudioChannel> mixed_channels_;
  // TODO(andrew): improve this, we don't need the full 32 kHz space here.
  scoped_array<AudioChannel> mixed_low_pass_channels_;
  scoped_array<AudioChannel> low_pass_reference_channels_;
};
}  // namespace webrtc

#endif  // WEBRTC_MODULES_AUDIO_PROCESSING_MAIN_SOURCE_AUDIO_BUFFER_H_