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- /*
- * Copyright 2018 The WebRTC project authors. All Rights Reserved.
- *
- * Use of this source code is governed by a BSD-style license
- * that can be found in the LICENSE file in the root of the source
- * tree. An additional intellectual property rights grant can be found
- * in the file PATENTS. All contributing project authors may
- * be found in the AUTHORS file in the root of the source tree.
- */
- #ifndef API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
- #define API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
- #include "api/array_view.h"
- #include "api/media_types.h"
- #include "rtc_base/ref_count.h"
- namespace webrtc {
- // FrameEncryptorInterface allows users to provide a custom encryption
- // implementation to encrypt all outgoing audio and video frames. The user must
- // also provide a FrameDecryptorInterface to be able to decrypt the frames on
- // the receiving device. Note this is an additional layer of encryption in
- // addition to the standard SRTP mechanism and is not intended to be used
- // without it. Implementations of this interface will have the same lifetime as
- // the RTPSenders it is attached to. Additional data may be null.
- class FrameEncryptorInterface : public rtc::RefCountInterface {
- public:
- ~FrameEncryptorInterface() override {}
- // Attempts to encrypt the provided frame. You may assume the encrypted_frame
- // will match the size returned by GetMaxCiphertextByteSize for a give frame.
- // You may assume that the frames will arrive in order if SRTP is enabled.
- // The ssrc will simply identify which stream the frame is travelling on. You
- // must set bytes_written to the number of bytes you wrote in the
- // encrypted_frame. 0 must be returned if successful all other numbers can be
- // selected by the implementer to represent error codes.
- virtual int Encrypt(cricket::MediaType media_type,
- uint32_t ssrc,
- rtc::ArrayView<const uint8_t> additional_data,
- rtc::ArrayView<const uint8_t> frame,
- rtc::ArrayView<uint8_t> encrypted_frame,
- size_t* bytes_written) = 0;
- // Returns the total required length in bytes for the output of the
- // encryption. This can be larger than the actual number of bytes you need but
- // must never be smaller as it informs the size of the encrypted_frame buffer.
- virtual size_t GetMaxCiphertextByteSize(cricket::MediaType media_type,
- size_t frame_size) = 0;
- };
- } // namespace webrtc
- #endif // API_CRYPTO_FRAME_ENCRYPTOR_INTERFACE_H_
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