// Copyright (c) 2012 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_ #define MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_ #include "media/base/audio_converter.h" namespace media { // LoopbackAudioConverter works similar to AudioConverter and converts input // streams to different audio parameters. Then, the LoopbackAudioConverter can // be used as an input to another AudioConverter. This allows us to // use converted audio from AudioOutputStreams as input to an AudioConverter. // For example, this allows converting multiple streams into a common format and // using the converted audio as input to another AudioConverter (i.e. a mixer). class MEDIA_EXPORT LoopbackAudioConverter : public AudioConverter::InputCallback { public: LoopbackAudioConverter(const AudioParameters& input_params, const AudioParameters& output_params, bool disable_fifo); LoopbackAudioConverter(const LoopbackAudioConverter&) = delete; LoopbackAudioConverter& operator=(const LoopbackAudioConverter&) = delete; ~LoopbackAudioConverter() override; void AddInput(AudioConverter::InputCallback* input) { audio_converter_.AddInput(input); } void RemoveInput(AudioConverter::InputCallback* input) { audio_converter_.RemoveInput(input); } bool empty() { return audio_converter_.empty(); } private: double ProvideInput(AudioBus* audio_bus, uint32_t frames_delayed) override; AudioConverter audio_converter_; }; } // namespace media #endif // MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_