1 /* 2 * Copyright (c) 2011 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_ 12 #define WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_ 13 14 #include "webrtc/modules/include/module_common_types.h" 15 #include "webrtc/typedefs.h" 16 17 namespace webrtc { 18 class MixHistory; 19 20 // A callback class that all mixer participants must inherit from/implement. 21 class MixerParticipant 22 { 23 public: 24 // The implementation of this function should update audioFrame with new 25 // audio every time it's called. 26 // 27 // If it returns -1, the frame will not be added to the mix. 28 virtual int32_t GetAudioFrame(int32_t id, 29 AudioFrame* audioFrame) = 0; 30 31 // Returns true if the participant was mixed this mix iteration. 32 bool IsMixed() const; 33 34 // This function specifies the sampling frequency needed for the AudioFrame 35 // for future GetAudioFrame(..) calls. 36 virtual int32_t NeededFrequency(int32_t id) const = 0; 37 38 MixHistory* _mixHistory; 39 protected: 40 MixerParticipant(); 41 virtual ~MixerParticipant(); 42 }; 43 44 class AudioMixerOutputReceiver 45 { 46 public: 47 // This callback function provides the mixed audio for this mix iteration. 48 // Note that uniqueAudioFrames is an array of AudioFrame pointers with the 49 // size according to the size parameter. 50 virtual void NewMixedAudio(const int32_t id, 51 const AudioFrame& generalAudioFrame, 52 const AudioFrame** uniqueAudioFrames, 53 const uint32_t size) = 0; 54 protected: AudioMixerOutputReceiver()55 AudioMixerOutputReceiver() {} ~AudioMixerOutputReceiver()56 virtual ~AudioMixerOutputReceiver() {} 57 }; 58 } // namespace webrtc 59 60 #endif // WEBRTC_MODULES_AUDIO_CONFERENCE_MIXER_INCLUDE_AUDIO_CONFERENCE_MIXER_DEFINES_H_ 61