103 lines
3.6 KiB
C++
103 lines
3.6 KiB
C++
// Copyright 2014 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 MEDIA_BASE_KEY_SOURCE_H_
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#define MEDIA_BASE_KEY_SOURCE_H_
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#include <string>
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#include <vector>
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#include "packager/media/base/protection_system_specific_info.h"
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#include "packager/media/base/status.h"
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namespace shaka {
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namespace media {
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struct EncryptionKey {
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EncryptionKey();
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~EncryptionKey();
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std::vector<ProtectionSystemSpecificInfo> key_system_info;
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std::vector<uint8_t> key_id;
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std::vector<uint8_t> key;
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std::vector<uint8_t> iv;
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};
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/// KeySource is responsible for encryption key acquisition.
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class KeySource {
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public:
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enum TrackType {
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TRACK_TYPE_UNKNOWN = 0,
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TRACK_TYPE_SD = 1,
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TRACK_TYPE_HD = 2,
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TRACK_TYPE_UHD1 = 3,
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TRACK_TYPE_UHD2 = 4,
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TRACK_TYPE_AUDIO = 5,
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TRACK_TYPE_UNSPECIFIED = 6,
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NUM_VALID_TRACK_TYPES = 6
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};
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KeySource();
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virtual ~KeySource();
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/// Fetch keys for CENC from the key server.
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/// @param pssh_box The entire PSSH box for the content to be decrypted
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/// @return OK on success, an error status otherwise.
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virtual Status FetchKeys(const std::vector<uint8_t>& pssh_box) = 0;
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/// Fetch keys for CENC from the key server.
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/// @param key_ids the key IDs for the keys to fetch from the server.
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/// @return OK on success, an error status otherwise.
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virtual Status FetchKeys(
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const std::vector<std::vector<uint8_t>>& key_ids) = 0;
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/// Fetch keys for WVM decryption from the key server.
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/// @param asset_id is the Widevine Classic asset ID for the content to be
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/// decrypted.
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/// @return OK on success, an error status otherwise.
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virtual Status FetchKeys(uint32_t asset_id) = 0;
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/// Get encryption key of the specified track type.
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/// @param track_type is the type of track for which retrieving the key.
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/// @param key is a pointer to the EncryptionKey which will hold the retrieved
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/// key. Owner retains ownership, and may not be NULL.
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/// @return OK on success, an error status otherwise.
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virtual Status GetKey(TrackType track_type, EncryptionKey* key) = 0;
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/// Get the encryption key specified by the CENC key ID.
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/// @param key_id is the unique identifier for the key being retreived.
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/// @param key is a pointer to the EncryptionKey which will hold the retrieved
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/// key. Owner retains ownership, and may not be NULL.
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/// @return OK on success, or an error status otherwise.
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virtual Status GetKey(const std::vector<uint8_t>& key_id,
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EncryptionKey* key) = 0;
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/// Get encryption key of the specified track type at the specified index.
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/// @param crypto_period_index is the sequence number of the key rotation
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/// period for which the key is being retrieved.
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/// @param track_type is the type of track for which retrieving the key.
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/// @param key is a pointer to the EncryptionKey which will hold the retrieved
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/// key. Owner retains ownership, and may not be NULL.
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/// @return OK on success, an error status otherwise.
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virtual Status GetCryptoPeriodKey(uint32_t crypto_period_index,
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TrackType track_type,
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EncryptionKey* key) = 0;
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/// Convert string representation of track type to enum representation.
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static TrackType GetTrackTypeFromString(const std::string& track_type_string);
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/// Convert TrackType to string.
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static std::string TrackTypeToString(TrackType track_type);
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private:
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DISALLOW_COPY_AND_ASSIGN(KeySource);
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};
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} // namespace media
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} // namespace shaka
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#endif // MEDIA_BASE_KEY_SOURCE_H_
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