blob: e30358fa14a222807c13a426687ab2eed372037d [file] [log] [blame]
// 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.
#include <stdint.h>
#include "base/callback.h"
#include "base/macros.h"
#include "base/memory/weak_ptr.h"
#include "base/sequence_checker.h"
#include "media/base/callback_registry.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 SequencedTaskRunner;
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 {
const scoped_refptr<base::SequencedTaskRunner>& task_runner,
MediaLog* media_log);
DecryptingVideoDecoder(const DecryptingVideoDecoder&) = delete;
DecryptingVideoDecoder& operator=(const DecryptingVideoDecoder&) = delete;
~DecryptingVideoDecoder() override;
bool SupportsDecryption() const override;
// VideoDecoder implementation.
VideoDecoderType GetDecoderType() const override;
void Initialize(const VideoDecoderConfig& config,
bool low_delay,
CdmContext* cdm_context,
InitCB init_cb,
const OutputCB& output_cb,
const WaitingCB& waiting_cb) override;
void Decode(scoped_refptr<DecoderBuffer> buffer, DecodeCB decode_cb) override;
void Reset(base::OnceClosure closure) override;
static const char kDecoderName[];
// For a detailed state diagram please see this link:
// TODO(xhwang): Add a ASCII state diagram in this file after this class
// stabilizes.
enum State {
kUninitialized = 0,
// 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 CDM to notify |this|.
void OnCdmContextEvent(CdmContext::Event event);
// 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::SequencedTaskRunner> const task_runner_;
MediaLog* const media_log_;
State state_ = kUninitialized;
InitCB init_cb_;
OutputCB output_cb_;
DecodeCB decode_cb_;
base::OnceClosure 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;
// To keep the CdmContext event callback registered.
std::unique_ptr<CallbackRegistration> event_cb_registration_;
base::WeakPtrFactory<DecryptingVideoDecoder> weak_factory_{this};
} // namespace media