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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.
#include "webrtc/base/checks.h"
#include "webrtc/modules/include/module_common_types.h"
#include "webrtc/typedefs.h"
namespace webrtc {
class NewMixHistory;
// A callback class that all mixer participants must inherit from/implement.
class MixerAudioSource {
// The implementation of this function should update audioFrame with new
// audio every time it's called.
// If it returns -1, the frame will not be added to the mix.
// NOTE: This function should not be called. It will remain for a short
// time so that subclasses can override it without getting warnings.
// TODO(henrik.lundin) Remove this function.
virtual int32_t GetAudioFrame(int32_t id, AudioFrame* audioFrame) {
return -1;
// The implementation of GetAudioFrameWithMuted should update audio_frame
// with new audio every time it's called. The return value will be
// interpreted as follows.
enum class AudioFrameInfo {
kNormal, // The samples in audio_frame are valid and should be used.
kMuted, // The samples in audio_frame should not be used, but should be
// implicitly interpreted as zero. Other fields in audio_frame
// may be read and should contain meaningful values.
kError // audio_frame will not be used.
virtual AudioFrameInfo GetAudioFrameWithMuted(int32_t id,
AudioFrame* audio_frame) {
return GetAudioFrame(id, audio_frame) == -1 ? AudioFrameInfo::kError
: AudioFrameInfo::kNormal;
// Returns true if the participant was mixed this mix iteration.
bool IsMixed() const;
// This function specifies the sampling frequency needed for the AudioFrame
// for future GetAudioFrame(..) calls.
virtual int32_t NeededFrequency(int32_t id) const = 0;
NewMixHistory* _mixHistory;
virtual ~MixerAudioSource();
class OldAudioMixerOutputReceiver {
// This callback function provides the mixed audio for this mix iteration.
// Note that uniqueAudioFrames is an array of AudioFrame pointers with the
// size according to the size parameter.
virtual void NewMixedAudio(const int32_t id,
const AudioFrame& generalAudioFrame,
const AudioFrame** uniqueAudioFrames,
const uint32_t size) = 0;
OldAudioMixerOutputReceiver() {}
virtual ~OldAudioMixerOutputReceiver() {}
} // namespace webrtc