media/webm/webm_crypto_helpers.h

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef MEDIA_WEBM_WEBM_CRYPTO_HELPERS_H_
   6 #define MEDIA_WEBM_WEBM_CRYPTO_HELPERS_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/memory/scoped_ptr.h"
  10 #include "media/base/decoder_buffer.h"
  11
  12 namespace media {
  13
  14 // TODO(xhwang): Figure out the init data type appropriately once it's spec'ed.
  15 // See https://www.w3.org/Bugs/Public/show_bug.cgi?id=19096 for more
  16 // information.
  17 const char kWebMEncryptInitDataType[] = "video/webm";
  18
  19 // Fills an initialized DecryptConfig, which can be sent to the Decryptor if
  20 // the stream has potentially encrypted frames. Also sets |data_offset| which
  21 // indicates where the encrypted data starts. Leaving the IV empty will tell
  22 // the decryptor that the frame is unencrypted. Returns true if |data| is valid,
  23 // false otherwise, in which case |decrypt_config| and |data_offset| will not be
  24 // changed. Current encrypted WebM request for comments specification is here
  25 // http://wiki.webmproject.org/encryption/webm-encryption-rfc
  26 bool WebMCreateDecryptConfig(const uint8* data, int data_size,
  27                              const uint8* key_id, int key_id_size,
  28                              scoped_ptr<DecryptConfig>* decrypt_config,
  29                              int* data_offset);
  30
  31 }  // namespace media
  32
  33 #endif  // MEDIA_WEBM_WEBM_CRYPT_HELPERS_H_