cenc_decryptor.cc | Explore in Territory

// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifdef UNSAFE_BUFFERS_BUILD
// TODO(crbug.com/40285824): Remove this and convert code to safer constructs.
#pragma allow_unsafe_buffers
#endif

#include "media/cdm/cenc_decryptor.h"

#include <stdint.h>

#include <memory>
#include <string>
#include <string_view>
#include <vector>

#include "base/containers/heap_array.h"
#include "base/containers/span.h"
#include "base/logging.h"
#include "crypto/encryptor.h"
#include "crypto/symmetric_key.h"
#include "media/base/decoder_buffer.h"
#include "media/base/decrypt_config.h"
#include "media/base/subsample_entry.h"

namespace media {

namespace {

enum ClearBytesBufferSel { … };

// Copy the cypher bytes as specified by |subsamples| from |src| to |dst|.
// If |sel| == kSrcContainsClearBytes, then |src| is expected to contain any
// clear bytes specified by |subsamples| and will be skipped. This is used
// when copying all the protected data out of a sample. If |sel| ==
// kDstContainsClearBytes, then any clear bytes mentioned in |subsamples|
// will be skipped in |dst|. This is used when copying the decrypted bytes
// back into the buffer, replacing the encrypted portions.
//
// TODO(crbug.com/40284755): This function is not bounds-safe. Make this
// span-based instead.
void CopySubsamples(const std::vector<SubsampleEntry>& subsamples,
                    const ClearBytesBufferSel sel,
                    const uint8_t* src,
                    uint8_t* dst) { … }

// TODO(crbug.com/40575437): This should be done in DecoderBuffer so that
// additional fields are more easily handled.
void CopyExtraSettings(const DecoderBuffer& input, DecoderBuffer* output) { … }

}  // namespace

scoped_refptr<DecoderBuffer> DecryptCencBuffer(
    const DecoderBuffer& input,
    const crypto::SymmetricKey& key) { … }

}  // namespace media
chromium/media/cdm/cenc_decryptor.cc
