cenc_utils.cc | Explore in Territory

// Copyright 2015 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_utils.h"

#include <memory>

#include "media/base/media_util.h"
#include "media/formats/mp4/box_definitions.h"
#include "media/formats/mp4/box_reader.h"

namespace media {

// The initialization data for encrypted media files using the ISO Common
// Encryption ('cenc') protection scheme may contain one or more protection
// system specific header ('pssh') boxes.
// ref: https://w3c.github.io/encrypted-media/cenc-format.html

// CENC SystemID for the Common System.
// https://w3c.github.io/encrypted-media/cenc-format.html#common-system
const uint8_t kCencCommonSystemId[] = …;

// Returns true if |input| contains only 1 or more valid 'pssh' boxes, false
// otherwise. |pssh_boxes| is updated as the set of parsed 'pssh' boxes.
// Note: All boxes in |input| must be 'pssh' boxes. However, if they can't be
//       properly parsed (e.g. unsupported version), then they will be skipped.
static bool ReadAllPsshBoxes(
    const std::vector<uint8_t>& input,
    std::vector<mp4::FullProtectionSystemSpecificHeader>* pssh_boxes) { … }

bool ValidatePsshInput(const std::vector<uint8_t>& input) { … }

bool GetKeyIdsForCommonSystemId(const std::vector<uint8_t>& pssh_boxes,
                                KeyIdList* key_ids) { … }

bool GetPsshData(const std::vector<uint8_t>& input,
                 const std::vector<uint8_t>& system_id,
                 std::vector<uint8_t>* pssh_data) { … }

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