chromium/third_party/blink/public/platform/web_audio_source_provider_impl.h

// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_SOURCE_PROVIDER_IMPL_H_
#define THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_SOURCE_PROVIDER_IMPL_H_

#include <stddef.h>

#include <memory>
#include <string>

#include "base/functional/callback.h"
#include "base/functional/callback_forward.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/synchronization/lock.h"
#include "media/base/audio_renderer_sink.h"
#include "third_party/blink/public/platform/web_audio_source_provider.h"
#include "third_party/blink/public/platform/web_common.h"
#include "third_party/blink/public/platform/web_vector.h"

namespace media {
class MediaLog;
}

namespace blink {

class WebAudioSourceProviderClient;

// WebAudioSourceProviderImpl is either one of two things (but not both):
// - a connection between a RestartableAudioRendererSink (the |sink_|) passed in
//   constructor and an AudioRendererSink::RenderCallback passed on Initialize()
//   by means of an internal AudioRendererSink::RenderCallback.
// - a connection between the said AudioRendererSink::RenderCallback and a
//   WebAudioSourceProviderClient passed via setClient() (the |client_|),
//   again using the internal AudioRendererSink::RenderCallback. Blink calls
//   provideInput() periodically to fetch the appropriate data.
//
// In either case, the internal RenderCallback allows for delivering a copy of
// the data if a listener is configured. WASPImpl is also a
// RestartableAudioRendererSink itself in order to be controlled (Play(),
// Pause() etc).
//
// All calls are protected by a lock.
class BLINK_PLATFORM_EXPORT WebAudioSourceProviderImpl
    : public WebAudioSourceProvider,
      public media::SwitchableAudioRendererSink { … };

}  // namespace blink

#endif  // THIRD_PARTY_BLINK_PUBLIC_PLATFORM_WEB_AUDIO_SOURCE_PROVIDER_IMPL_H_