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// Copyright (c) 2013 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.
#include "base/time/time.h"
#include "media/base/audio_bus.h"
#include "media/base/media_export.h"
// Audio sources may optionally implement AudioSourceDiverter to temporarily
// divert audio data to an alternate AudioOutputStream. This allows the audio
// data to be plumbed to an alternate consumer; for example, a loopback
// mechanism for audio mirroring.
namespace media {
class AudioOutputStream;
class AudioParameters;
class MEDIA_EXPORT AudioPushSink {
// Call this function to push audio data into the sink.
virtual void OnData(std::unique_ptr<AudioBus> source,
base::TimeTicks reference_time) = 0;
// Close the stream.
// After calling this method, the object should not be used anymore.
virtual void Close() = 0;
class MEDIA_EXPORT AudioSourceDiverter {
// Returns the audio parameters of the divertable audio data.
virtual const AudioParameters& GetAudioParameters() = 0;
// Start providing audio data to the given |to_stream|, which is in an
// unopened state. |to_stream| remains under the control of the
// AudioSourceDiverter.
virtual void StartDiverting(AudioOutputStream* to_stream) = 0;
// Stops diverting audio data to the stream. The AudioSourceDiverter is
// responsible for making sure the stream is closed, perhaps asynchronously.
virtual void StopDiverting() = 0;
// Start duplicating the current audio stream, and push the copied data into
// |sink|.
virtual void StartDuplicating(AudioPushSink* sink) = 0;
// Stop duplicating for the specified |sink|. The AudioSourceDiverter is
// responsible for making sure the sink is closed, perhaps asynchronously.
virtual void StopDuplicating(AudioPushSink* sink) = 0;
virtual ~AudioSourceDiverter() {}
} // namespace media