116 lines
4.3 KiB
C++
116 lines
4.3 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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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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/// This structure defines encryption options.
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struct EncryptionOptions {
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/// Clear lead duration in seconds.
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double clear_lead_in_seconds = 0;
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/// The protection scheme: 'cenc', 'cens', 'cbc1', 'cbcs'.
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FourCC protection_scheme = FOURCC_cenc;
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/// The threshold to determine whether a video track should be considered as
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/// SD. If the max pixels per frame is no higher than max_sd_pixels, i.e.
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/// [0, max_sd_pixels], it is SD.
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uint32_t max_sd_pixels = 0;
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/// The threshold to determine whether a video track should be considered as
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/// HD. If the max pixels per frame is higher than max_sd_pixels, but no
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/// higher than max_hd_pixels, i.e. (max_sd_pixels, max_hd_pixels], it is HD.
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uint32_t max_hd_pixels = 0;
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/// The threshold to determine whether a video track should be considered as
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/// UHD1. If the max pixels per frame is higher than max_hd_pixels, but no
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/// higher than max_uhd1_pixels, i.e. (max_hd_pixels, max_uhd1_pixels], it is
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/// UHD1. Otherwise it is UHD2.
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uint32_t max_uhd1_pixels = 0;
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/// Crypto period duration in seconds. A positive value means key rotation is
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/// enabled, the key source must support key rotation in this case.
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double crypto_period_duration_in_seconds = 0;
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};
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class EncryptionHandler : public MediaHandler {
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public:
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EncryptionHandler(const EncryptionOptions& encryption_options,
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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(StreamInfo* stream_info);
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// Processes media sample and encrypts it if needed.
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Status ProcessMediaSample(MediaSample* sample);
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bool CreateEncryptor(EncryptionKey* encryption_key);
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bool EncryptVpxFrame(const std::vector<VPxFrameInfo>& vpx_frames,
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MediaSample* sample,
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DecryptConfig* decrypt_config);
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bool EncryptNalFrame(MediaSample* sample, DecryptConfig* decrypt_config);
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void EncryptBytes(uint8_t* data, 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 EncryptionOptions encryption_options_;
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KeySource* key_source_ = nullptr;
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KeySource::TrackType track_type_ = KeySource::TRACK_TYPE_UNKNOWN;
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std::unique_ptr<AesCryptor> encryptor_;
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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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Codec video_codec_ = kUnknownCodec;
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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 new_segment_ = true;
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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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// Current key id.
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std::vector<uint8_t> key_id_;
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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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