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