media/cdm/cenc_utils.h

   1 // Copyright 2015 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_CDM_CENC_UTILS_H_
   6 #define MEDIA_CDM_CENC_UTILS_H_
   7
   8 #include <vector>
   9
  10 #include "base/basictypes.h"
  11 #include "media/base/media_export.h"
  12 #include "media/cdm/json_web_key.h"
  13
  14 namespace media {
  15
  16 // Validate that |input| is a set of concatenated 'pssh' boxes and the sizes
  17 // match. Returns true if |input| looks valid, false otherwise.
  18 MEDIA_EXPORT bool ValidatePsshInput(const std::vector<uint8_t>& input);
  19
  20 // Gets the Key Ids from the first 'pssh' box for the Common System ID among one
  21 // or more concatenated 'pssh' boxes. Returns true if a matching box is found
  22 // and it contains 1 or more key IDs. Returns false otherwise.
  23 // Notes:
  24 // 1. If multiple PSSH boxes are found, the "KIDs" of the first matching 'pssh'
  25 //    box will be set in |key_ids|.
  26 // 2. Only PSSH boxes are allowed in |input|. Any other boxes in |pssh_boxes|
  27 //    will result in false being returned.
  28 MEDIA_EXPORT bool GetKeyIdsForCommonSystemId(
  29     const std::vector<uint8_t>& pssh_boxes,
  30     KeyIdList* key_ids);
  31
  32 // Gets the data field from the first 'pssh' box containing |system_id|.
  33 // Returns true if such a box is found and successfully parsed. Returns false
  34 // otherwise.
  35 // Notes:
  36 // 1. If multiple PSSH boxes are found, the "Data" of the first matching 'pssh'
  37 //    box will be set in |pssh_data|.
  38 // 2. Only PSSH boxes are allowed in |input|. Any other boxes in |pssh_boxes|
  39 //    will result in false being returned.
  40 MEDIA_EXPORT bool GetPsshData(const std::vector<uint8_t>& input,
  41                               const std::vector<uint8_t>& system_id,
  42                               std::vector<uint8_t>* pssh_data);
  43
  44 }  // namespace media
  45
  46 #endif  // MEDIA_CDM_CENC_UTILS_H_