blob: c5738860ae3456ec3770f4e571e91320aa229cf9 [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 <string>
#include "base/basictypes.h"
#include "base/callback.h"
#include "base/memory/ref_counted.h"
#include "base/memory/weak_ptr.h"
#include "cobalt/media/base/audio_decoder_config.h"
#include "cobalt/media/base/cdm_context.h"
#include "cobalt/media/base/decryptor.h"
#include "cobalt/media/base/demuxer_stream.h"
#include "cobalt/media/base/pipeline_status.h"
#include "cobalt/media/base/video_decoder_config.h"
namespace base {
class SingleThreadTaskRunner;
namespace cobalt {
namespace media {
class DecoderBuffer;
class MediaLog;
// Decryptor-based DemuxerStream implementation that converts a potentially
// encrypted demuxer stream to a clear demuxer stream.
// All public APIs and callbacks are trampolined to the |task_runner_| so
// that no locks are required for thread safety.
class MEDIA_EXPORT DecryptingDemuxerStream : public DemuxerStream {
const scoped_refptr<base::SingleThreadTaskRunner>& task_runner,
const scoped_refptr<MediaLog>& media_log,
const base::Closure& waiting_for_decryption_key_cb);
// Cancels all pending operations immediately and fires all pending callbacks.
~DecryptingDemuxerStream() OVERRIDE;
// |steram| must be encrypted and |cdm_context| must be non-null.
void Initialize(DemuxerStream* stream, CdmContext* cdm_context,
const PipelineStatusCB& status_cb);
// Cancels all pending operations and fires all pending callbacks. If in
// kPendingDemuxerRead or kPendingDecrypt state, waits for the pending
// operation to finish before satisfying |closure|. Sets the state to
// kUninitialized if |this| hasn't been initialized, or to kIdle otherwise.
void Reset(const base::Closure& closure);
// Returns the name of this class for logging purpose.
std::string GetDisplayName() const;
// DemuxerStream implementation.
void Read(const ReadCB& read_cb) OVERRIDE;
AudioDecoderConfig audio_decoder_config() OVERRIDE;
VideoDecoderConfig video_decoder_config() OVERRIDE;
Type type() const OVERRIDE;
Liveness liveness() const OVERRIDE;
void EnableBitstreamConverter() OVERRIDE;
bool SupportsConfigChanges() OVERRIDE;
VideoRotation video_rotation() OVERRIDE;
bool enabled() const OVERRIDE;
void set_enabled(bool enabled, base::TimeDelta timestamp) OVERRIDE;
void SetStreamStatusChangeCB(const StreamStatusChangeCB& cb) OVERRIDE;
// For a detailed state diagram please see this link:
// TODO(xhwang): Add a ASCII state diagram in this file after this class
// stabilizes.
// TODO(xhwang): Update this diagram for DecryptingDemuxerStream.
enum State {
kUninitialized = 0,
// Callback for DemuxerStream::Read().
void DecryptBuffer(DemuxerStream::Status status,
const scoped_refptr<DecoderBuffer>& buffer);
void DecryptPendingBuffer();
// Callback for Decryptor::Decrypt().
void DeliverBuffer(Decryptor::Status status,
const scoped_refptr<DecoderBuffer>& decrypted_buffer);
// Callback for the |decryptor_| to notify this object that a new key has been
// added.
void OnKeyAdded();
// Resets decoder and calls |reset_cb_|.
void DoReset();
// Returns Decryptor::StreamType converted from |stream_type_|.
Decryptor::StreamType GetDecryptorStreamType() const;
// Creates and initializes either |audio_config_| or |video_config_| based on
// |demuxer_stream_|.
void InitializeDecoderConfig();
scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
scoped_refptr<MediaLog> media_log_;
State state_;
PipelineStatusCB init_cb_;
ReadCB read_cb_;
base::Closure reset_cb_;
base::Closure waiting_for_decryption_key_cb_;
// Pointer to the input demuxer stream that will feed us encrypted buffers.
DemuxerStream* demuxer_stream_;
AudioDecoderConfig audio_config_;
VideoDecoderConfig video_config_;
Decryptor* decryptor_;
// The buffer returned by the demuxer that needs to be decrypted.
scoped_refptr<media::DecoderBuffer> pending_buffer_to_decrypt_;
// Indicates the situation where new key is added during pending decryption
// (in other words, this variable can only be set in state kPendingDecrypt).
// If this variable is true and kNoKey is returned then we need to try
// decrypting again in case the newly added key is the correct decryption key.
bool key_added_while_decrypt_pending_;
base::WeakPtr<DecryptingDemuxerStream> weak_this_;
base::WeakPtrFactory<DecryptingDemuxerStream> weak_factory_;
} // namespace media
} // namespace cobalt