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// Copyright 2018 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 MEDIA_RENDERERS_DECRYPTING_RENDERER_H_
#define MEDIA_RENDERERS_DECRYPTING_RENDERER_H_
#include <memory>
#include "base/callback.h"
#include "base/memory/raw_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "base/task/single_thread_task_runner.h"
#include "media/base/pipeline.h"
#include "media/base/renderer.h"
namespace media {
class CdmContext;
class DemuxerStream;
class MediaLog;
class MediaResource;
class DecryptingMediaResource;
class RendererClient;
// DecryptingRenderer is used as a wrapper around a Renderer
// implementation that decrypts streams when an AesDecryptor is available. In
// this case only clear streams are passed on to the internally owned renderer
// implementation.
//
// All methods are pass-through except Initialize() and SetCdm().
//
// The caller must guarantee that DecryptingRenderer will never be initialized
// with a |media_resource| of type MediaResource::Type::URL.
class MEDIA_EXPORT DecryptingRenderer : public Renderer {
public:
DecryptingRenderer(
std::unique_ptr<Renderer> renderer,
MediaLog* media_log,
const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner);
DecryptingRenderer(const DecryptingRenderer&) = delete;
DecryptingRenderer& operator=(const DecryptingRenderer&) = delete;
~DecryptingRenderer() override;
// Renderer implementation:
void Initialize(MediaResource* media_resource,
RendererClient* client,
PipelineStatusCallback init_cb) override;
void SetCdm(CdmContext* cdm_context, CdmAttachedCB cdm_attached_cb) override;
void SetLatencyHint(absl::optional<base::TimeDelta> latency_hint) override;
void SetPreservesPitch(bool preserves_pitch) override;
void SetWasPlayedWithUserActivation(
bool was_played_with_user_activation) override;
void Flush(base::OnceClosure flush_cb) override;
void StartPlayingFrom(base::TimeDelta time) override;
void SetPlaybackRate(double playback_rate) override;
void SetVolume(float volume) override;
base::TimeDelta GetMediaTime() override;
void OnSelectedVideoTracksChanged(
const std::vector<DemuxerStream*>& enabled_tracks,
base::OnceClosure change_completed_cb) override;
void OnEnabledAudioTracksChanged(
const std::vector<DemuxerStream*>& enabled_tracks,
base::OnceClosure change_completed_cb) override;
bool HasDecryptingMediaResourceForTesting() const;
private:
friend class DecryptingRendererTest;
// Cannot be called before Initialize() has been called.
void CreateAndInitializeDecryptingMediaResource();
// Invoked as a callback after |decrypting_media_resource_| has been
// initialized.
void InitializeRenderer(bool success);
bool HasEncryptedStream();
void OnWaiting(WaitingReason reason);
const std::unique_ptr<Renderer> renderer_;
const raw_ptr<MediaLog> media_log_;
const scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
bool waiting_for_cdm_ = false;
raw_ptr<CdmContext> cdm_context_ = nullptr;
raw_ptr<RendererClient> client_;
raw_ptr<MediaResource> media_resource_;
PipelineStatusCallback init_cb_;
std::unique_ptr<DecryptingMediaResource> decrypting_media_resource_;
base::WeakPtrFactory<DecryptingRenderer> weak_factory_{this};
};
} // namespace media
#endif // MEDIA_RENDERERS_DECRYPTING_RENDERER_H_
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