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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_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
#define CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
#include "base/memory/ref_counted.h"
#include "base/synchronization/lock.h"
#include "media/audio/audio_parameters.h"
#include "media/base/audio_capturer_source.h"
#include "media/base/audio_fifo.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebAudioDestinationConsumer.h"
#include "third_party/WebKit/Source/Platform/chromium/public/WebVector.h"
namespace content {
class WebRtcAudioCapturer;
// WebAudioCapturerSource is the missing link between
// WebAudio's MediaStreamAudioDestinationNode and WebRtcAudioCapturer.
//
// 1. WebKit calls the setFormat() method setting up the basic stream format
// (channels, and sample-rate). At this time, it dispatches this information
// to the WebRtcAudioCapturer by calling its SetCapturerSource() method.
// 2. Initialize() is called, where we should get back the same
// stream format information as (1). We also get the CaptureCallback here.
// 3. consumeAudio() is called periodically by WebKit which dispatches the
// audio stream to the CaptureCallback::Capture() method.
class WebAudioCapturerSource
: public media::AudioCapturerSource,
public WebKit::WebAudioDestinationConsumer {
public:
explicit WebAudioCapturerSource(WebRtcAudioCapturer* capturer);
// WebAudioDestinationConsumer implementation.
// setFormat() is called early on, so that we can configure the capturer.
virtual void setFormat(size_t number_of_channels, float sample_rate) OVERRIDE;
// MediaStreamAudioDestinationNode periodically calls consumeAudio().
virtual void consumeAudio(const WebKit::WebVector<const float*>& audio_data,
size_t number_of_frames) OVERRIDE;
// AudioCapturerSource implementation.
virtual void Initialize(
const media::AudioParameters& params,
media::AudioCapturerSource::CaptureCallback* callback,
int session_id) OVERRIDE;
virtual void Start() OVERRIDE;
virtual void Stop() OVERRIDE;
virtual void SetVolume(double volume) OVERRIDE { }
virtual void SetAutomaticGainControl(bool enable) OVERRIDE { }
private:
virtual ~WebAudioCapturerSource();
WebRtcAudioCapturer* capturer_;
int set_format_channels_;
media::AudioParameters params_;
media::AudioCapturerSource::CaptureCallback* callback_;
// Wraps data coming from HandleCapture().
scoped_ptr<media::AudioBus> wrapper_bus_;
// Bus for reading from FIFO and calling the CaptureCallback.
scoped_ptr<media::AudioBus> capture_bus_;
// Handles mismatch between WebAudio buffer size and WebRTC.
scoped_ptr<media::AudioFifo> fifo_;
// Synchronizes HandleCapture() with AudioCapturerSource calls.
base::Lock lock_;
bool started_;
DISALLOW_COPY_AND_ASSIGN(WebAudioCapturerSource);
};
} // namespace content
#endif // CONTENT_RENDERER_MEDIA_WEBAUDIO_CAPTURER_SOURCE_H_
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