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 // Returns an initialized DecryptConfig, which can be sent to the Decryptor if
  20 // the stream has potentially encrypted frames. Every encrypted Block has a
  21 // signal byte, and if the frame is encrypted, an initialization vector
  22 // prepended to the frame. Leaving the IV empty will tell the decryptor that the
  23 // frame is unencrypted. Returns NULL if |data| is invalid. Current encrypted
  24 // WebM request for comments specification is here
  25 // http://wiki.webmproject.org/encryption/webm-encryption-rfc
  26 scoped_ptr<DecryptConfig> WebMCreateDecryptConfig(
  27     const uint8* data, int data_size,
  28     const uint8* key_id, int key_id_size);
  29
  30 }  // namespace media
  31
  32 #endif  // MEDIA_WEBM_WEBM_CRYPT_HELPERS_H_