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// 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 CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
#define CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
#include "content/public/browser/media_request_state.h"
#include "content/public/common/media_stream_request.h"
namespace content {
// An embedder may implement MediaObserver and return it from
// ContentBrowserClient to receive callbacks as media events occur.
class MediaObserver {
public:
// Called when a audio capture device is plugged in or unplugged.
virtual void OnAudioCaptureDevicesChanged(
const MediaStreamDevices& devices) = 0;
// Called when a video capture device is plugged in or unplugged.
virtual void OnVideoCaptureDevicesChanged(
const MediaStreamDevices& devices) = 0;
// Called when a media request changes state.
virtual void OnMediaRequestStateChanged(
int render_process_id,
int render_view_id,
int page_request_id,
const MediaStreamDevice& device,
MediaRequestState state) = 0;
// Called when an audio stream transitions into a playing or paused state, and
// also at regular intervals to report the current power level of the audio
// signal in dBFS (decibels relative to full-scale) units. |clipped| is true
// if any part of the audio signal has been clipped since the last call. See
// media/audio/audio_power_monitor.h for more info.
virtual void OnAudioStreamPlayingChanged(
int render_process_id,
int render_view_id,
int stream_id,
bool is_playing,
float power_dbfs,
bool clipped) = 0;
// Called when the audio stream is being created.
virtual void OnCreatingAudioStream(int render_process_id,
int render_view_id) = 0;
protected:
virtual ~MediaObserver() {}
};
} // namespace content
#endif // CONTENT_PUBLIC_BROWSER_MEDIA_OBSERVER_H_
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