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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 MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_
#define MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_
#include <stdint.h>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "media/base/cdm_context.h"
#include "media/base/decryptor.h"
#include "media/base/video_decoder.h"
#include "media/base/video_decoder_config.h"
namespace base {
class SingleThreadTaskRunner;
}
namespace media {
class DecoderBuffer;
class Decryptor;
class MediaLog;
// Decryptor-based VideoDecoder implementation that can decrypt and decode
// encrypted video buffers and return decrypted and decompressed video frames.
// All public APIs and callbacks are trampolined to the |task_runner_| so
// that no locks are required for thread safety.
class MEDIA_EXPORT DecryptingVideoDecoder : public VideoDecoder {
public:
DecryptingVideoDecoder(
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
MediaLog* media_log);
~DecryptingVideoDecoder() override;
// VideoDecoder implementation.
std::string GetDisplayName() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
const InitCB& init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer,
const DecodeCB& decode_cb) override;
void Reset(const base::Closure& closure) override;
static const char kDecoderName[];
private:
// For a detailed state diagram please see this link: http://goo.gl/8jAok
// TODO(xhwang): Add a ASCII state diagram in this file after this class
// stabilizes.
enum State {
kUninitialized = 0,
kPendingDecoderInit,
kIdle,
kPendingDecode,
kWaitingForKey,
kDecodeFinished,
kError
};
// Callback for Decryptor::InitializeVideoDecoder() during initialization.
void FinishInitialization(bool success);
void DecodePendingBuffer();
// Callback for Decryptor::DecryptAndDecodeVideo().
void DeliverFrame(Decryptor::Status status, scoped_refptr<VideoFrame> frame);
// Callback for the |decryptor_| to notify this object that a new key has been
// added.
void OnKeyAdded();
// Reset decoder and call |reset_cb_|.
void DoReset();
// Completes traces for various pending states.
void CompletePendingDecode(Decryptor::Status status);
void CompleteWaitingForDecryptionKey();
// Set in constructor.
scoped_refptr<base::SingleThreadTaskRunner> const task_runner_;
MediaLog* const media_log_;
State state_ = kUninitialized;
InitCB init_cb_;
OutputCB output_cb_;
DecodeCB decode_cb_;
base::Closure reset_cb_;
WaitingCB waiting_cb_;
VideoDecoderConfig config_;
Decryptor* decryptor_ = nullptr;
// The buffer that needs decrypting/decoding.
scoped_refptr<media::DecoderBuffer> pending_buffer_to_decode_;
// Indicates the situation where new key is added during pending decode
// (in other words, this variable can only be set in state kPendingDecode).
// If this variable is true and kNoKey is returned then we need to try
// decrypting/decoding again in case the newly added key is the correct
// decryption key.
bool key_added_while_decode_pending_ = false;
// Once Initialized() with encrypted content support, if the stream changes to
// clear content, we want to ensure this decoder remains used.
bool support_clear_content_ = false;
base::WeakPtr<DecryptingVideoDecoder> weak_this_;
base::WeakPtrFactory<DecryptingVideoDecoder> weak_factory_;
DISALLOW_COPY_AND_ASSIGN(DecryptingVideoDecoder);
};
} // namespace media
#endif // MEDIA_FILTERS_DECRYPTING_VIDEO_DECODER_H_