voice_engine/output_mixer.h

/*
 *  Copyright (c) 2012 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 VOICE_ENGINE_OUTPUT_MIXER_H_
#define VOICE_ENGINE_OUTPUT_MIXER_H_

#include <memory>

#include "common_audio/resampler/include/push_resampler.h"
#include "common_types.h"  // NOLINT(build/include)
#include "modules/audio_conference_mixer/include/audio_conference_mixer.h"
#include "modules/audio_conference_mixer/include/audio_conference_mixer_defines.h"
#include "rtc_base/criticalsection.h"

namespace webrtc {

class AudioProcessing;
class FileWrapper;

namespace voe {

class Statistics;

class OutputMixer : public AudioMixerOutputReceiver
{
public:
    static int32_t Create(OutputMixer*& mixer, uint32_t instanceId);

    static void Destroy(OutputMixer*& mixer);

    int32_t SetEngineInformation(Statistics& engineStatistics);

    int32_t SetAudioProcessingModule(
        AudioProcessing* audioProcessingModule);

    int32_t MixActiveChannels();

    int32_t DoOperationsOnCombinedSignal(bool feed_data_to_apm);

    int32_t SetMixabilityStatus(MixerParticipant& participant,
                                bool mixable);

    int GetMixedAudio(int sample_rate_hz, size_t num_channels,
                      AudioFrame* audioFrame);

    virtual ~OutputMixer();

    // from AudioMixerOutputReceiver
    virtual void NewMixedAudio(
        int32_t id,
        const AudioFrame& generalAudioFrame,
        const AudioFrame** uniqueAudioFrames,
        uint32_t size);

private:
    OutputMixer(uint32_t instanceId);

    // uses
    Statistics* _engineStatisticsPtr;
    AudioProcessing* _audioProcessingModulePtr;

    AudioConferenceMixer& _mixerModule;
    AudioFrame _audioFrame;
    // Converts mixed audio to the audio device output rate.
    PushResampler<int16_t> resampler_;
    // Converts mixed audio to the audio processing rate.
    PushResampler<int16_t> audioproc_resampler_;
    int _instanceId;
    int _mixingFrequencyHz;
};

}  // namespace voe

}  // namespace werbtc

#endif  // VOICE_ENGINE_OUTPUT_MIXER_H_