Combine 'pssh' parsing routines.

media/cdm/cenc_utils.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef MEDIA_CDM_CENC_UTILS_H_
 #define MEDIA_CDM_CENC_UTILS_H_
 
 #include <vector>
 
 #include "base/basictypes.h"
@@ skipping 10 matching lines @@
 // more concatenated 'pssh' boxes. If |input| looks valid, then true is
 // returned and |key_ids| is updated to contain the values found. Otherwise
 // return false.
 // TODO(jrummell): This returns true if no Common SystemID 'pssh' boxes are
 // found, or are included but don't contain any key IDs. This should be
 // fixed once the test files are updated to include correct 'pssh' boxes.
 // http://crbug.com/460308
 MEDIA_EXPORT bool GetKeyIdsForCommonSystemId(const std::vector<uint8_t>& input,
                                              KeyIdList* key_ids);
 
+// Gets the data field from the first 'pssh' box containing |system_id| UUID.
+// Returns true if such a box is found and successfully parsed. Returns false
+// otherwise.
+// Notes:
+// 1. If multiple PSSH boxes are found, the "Data" of the first matching 'pssh'
+//    box will be set in |pssh_data|.
+// 2. Only PSSH boxes are allowed in |input|.
+MEDIA_EXPORT bool GetPsshData(const std::vector<uint8_t>& input,
+                              const std::vector<uint8_t>& system_id,
+                              std::vector<uint8_t>* pssh_data);
+
 }  // namespace media
 
 #endif  // MEDIA_CDM_CENC_UTILS_H_