99 lines
3.5 KiB
C++
99 lines
3.5 KiB
C++
// Copyright 2017 Google Inc. All rights reserved.
|
|
//
|
|
// Use of this source code is governed by a BSD-style
|
|
// license that can be found in the LICENSE file or at
|
|
// https://developers.google.com/open-source/licenses/bsd
|
|
|
|
#ifndef PACKAGER_MEDIA_CRYPTO_ENCRYPTION_HANDLER_H_
|
|
#define PACKAGER_MEDIA_CRYPTO_ENCRYPTION_HANDLER_H_
|
|
|
|
#include "packager/media/base/key_source.h"
|
|
#include "packager/media/base/media_handler.h"
|
|
#include "packager/media/public/crypto_params.h"
|
|
|
|
namespace shaka {
|
|
namespace media {
|
|
|
|
class AesCryptor;
|
|
class VideoSliceHeaderParser;
|
|
class VPxParser;
|
|
struct EncryptionKey;
|
|
struct VPxFrameInfo;
|
|
|
|
class EncryptionHandler : public MediaHandler {
|
|
public:
|
|
EncryptionHandler(const EncryptionParams& encryption_params,
|
|
KeySource* key_source);
|
|
|
|
~EncryptionHandler() override;
|
|
|
|
protected:
|
|
/// @name MediaHandler implementation overrides.
|
|
/// @{
|
|
Status InitializeInternal() override;
|
|
Status Process(std::unique_ptr<StreamData> stream_data) override;
|
|
/// @}
|
|
|
|
private:
|
|
friend class EncryptionHandlerTest;
|
|
|
|
EncryptionHandler(const EncryptionHandler&) = delete;
|
|
EncryptionHandler& operator=(const EncryptionHandler&) = delete;
|
|
|
|
// Processes |stream_info| and sets up stream specific variables.
|
|
Status ProcessStreamInfo(StreamInfo* stream_info);
|
|
// Processes media sample and encrypts it if needed.
|
|
Status ProcessMediaSample(MediaSample* sample);
|
|
|
|
Status SetupProtectionPattern(StreamType stream_type);
|
|
bool CreateEncryptor(const EncryptionKey& encryption_key);
|
|
bool EncryptVpxFrame(const std::vector<VPxFrameInfo>& vpx_frames,
|
|
MediaSample* sample,
|
|
DecryptConfig* decrypt_config);
|
|
bool EncryptNalFrame(MediaSample* sample, DecryptConfig* decrypt_config);
|
|
void EncryptBytes(uint8_t* data, size_t size);
|
|
|
|
// Testing injections.
|
|
void InjectVpxParserForTesting(std::unique_ptr<VPxParser> vpx_parser);
|
|
void InjectVideoSliceHeaderParserForTesting(
|
|
std::unique_ptr<VideoSliceHeaderParser> header_parser);
|
|
|
|
const EncryptionParams encryption_params_;
|
|
const FourCC protection_scheme_ = FOURCC_NULL;
|
|
KeySource* key_source_ = nullptr;
|
|
std::string stream_label_;
|
|
// Current encryption config and encryptor.
|
|
std::shared_ptr<EncryptionConfig> encryption_config_;
|
|
std::unique_ptr<AesCryptor> encryptor_;
|
|
Codec codec_ = kUnknownCodec;
|
|
// Specifies the size of NAL unit length in bytes. Can be 1, 2 or 4 bytes. 0
|
|
// if it is not a NAL structured video.
|
|
uint8_t nalu_length_size_ = 0;
|
|
// For Sample AES, 32 bytes for Video and 16 bytes for audio.
|
|
size_t leading_clear_bytes_size_ = 0;
|
|
// For Sample AES, 48+1 bytes for video NAL and 16+1 bytes for audio.
|
|
size_t min_protected_data_size_ = 0;
|
|
// Remaining clear lead in the stream's time scale.
|
|
int64_t remaining_clear_lead_ = 0;
|
|
// Crypto period duration in the stream's time scale.
|
|
uint64_t crypto_period_duration_ = 0;
|
|
// Previous crypto period index if key rotation is enabled.
|
|
int64_t prev_crypto_period_index_ = -1;
|
|
bool check_new_crypto_period_ = false;
|
|
|
|
// Number of encrypted blocks (16-byte-block) in pattern based encryption.
|
|
uint8_t crypt_byte_block_ = 0;
|
|
/// Number of unencrypted blocks (16-byte-block) in pattern based encryption.
|
|
uint8_t skip_byte_block_ = 0;
|
|
|
|
// VPx parser for VPx streams.
|
|
std::unique_ptr<VPxParser> vpx_parser_;
|
|
// Video slice header parser for NAL strucutred streams.
|
|
std::unique_ptr<VideoSliceHeaderParser> header_parser_;
|
|
};
|
|
|
|
} // namespace media
|
|
} // namespace shaka
|
|
|
|
#endif // PACKAGER_MEDIA_CRYPTO_ENCRYPTION_HANDLER_H_
|