| // 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 COBALT_MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_ |
| #define COBALT_MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_ |
| |
| #include "base/basictypes.h" |
| #include "cobalt/media/base/audio_converter.h" |
| |
| namespace cobalt { |
| 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 LoopbackAudioConverter : public AudioConverter::InputCallback { |
| public: |
| LoopbackAudioConverter(const AudioParameters& input_params, |
| const AudioParameters& output_params, |
| bool disable_fifo); |
| |
| ~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_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LoopbackAudioConverter); |
| }; |
| |
| } // namespace media |
| } // namespace cobalt |
| |
| #endif // COBALT_MEDIA_BASE_LOOPBACK_AUDIO_CONVERTER_H_ |