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/*
* 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_CONFERENCE_MIXER_INTERFACE_AUDIO_CONFERENCE_MIXER_H_
#define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INTERFACE_AUDIO_CONFERENCE_MIXER_H_
#include "webrtc/modules/audio_conference_mixer/interface/audio_conference_mixer_defines.h"
#include "webrtc/modules/interface/module.h"
#include "webrtc/modules/interface/module_common_types.h"
namespace webrtc {
class AudioMixerOutputReceiver;
class MixerParticipant;
class Trace;
class AudioConferenceMixer : public Module
{
public:
enum {kMaximumAmountOfMixedParticipants = 3};
enum Frequency
{
kNbInHz = 8000,
kWbInHz = 16000,
kSwbInHz = 32000,
kFbInHz = 48000,
kLowestPossible = -1,
kDefaultFrequency = kWbInHz
};
// Factory method. Constructor disabled.
static AudioConferenceMixer* Create(int id);
virtual ~AudioConferenceMixer() {}
// Module functions
int64_t TimeUntilNextProcess() override = 0;
int32_t Process() override = 0;
// Register/unregister a callback class for receiving the mixed audio.
virtual int32_t RegisterMixedStreamCallback(
AudioMixerOutputReceiver* receiver) = 0;
virtual int32_t UnRegisterMixedStreamCallback() = 0;
// Add/remove participants as candidates for mixing.
virtual int32_t SetMixabilityStatus(MixerParticipant* participant,
bool mixable) = 0;
// Returns true if a participant is a candidate for mixing.
virtual bool MixabilityStatus(
const MixerParticipant& participant) const = 0;
// Inform the mixer that the participant should always be mixed and not
// count toward the number of mixed participants. Note that a participant
// must have been added to the mixer (by calling SetMixabilityStatus())
// before this function can be successfully called.
virtual int32_t SetAnonymousMixabilityStatus(
MixerParticipant* participant, bool mixable) = 0;
// Returns true if the participant is mixed anonymously.
virtual bool AnonymousMixabilityStatus(
const MixerParticipant& participant) const = 0;
// Set the minimum sampling frequency at which to mix. The mixing algorithm
// may still choose to mix at a higher samling frequency to avoid
// downsampling of audio contributing to the mixed audio.
virtual int32_t SetMinimumMixingFrequency(Frequency freq) = 0;
protected:
AudioConferenceMixer() {}
};
} // namespace webrtc
#endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INTERFACE_AUDIO_CONFERENCE_MIXER_H_
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