Support for parsing encrypted WebM streams by src.

media/webm/webm_cluster_parser.cc

 // Copyright (c) 2012 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.
 
 #include "media/webm/webm_cluster_parser.h"
 
 #include <vector>
 
 #include "base/logging.h"
 #include "base/sys_byteorder.h"
 #include "media/base/data_buffer.h"
 #include "media/base/decrypt_config.h"
+#include "media/crypto/decryptor_helpers.h"
 #include "media/webm/webm_constants.h"
 
 namespace media {
 
-// Generates a 16 byte CTR counter block. The CTR counter block format is a
-// CTR IV appended with a CTR block counter. |iv| is an 8 byte CTR IV.
-// Returns a string of kDecryptionKeySize bytes.
-static std::string GenerateCounterBlock(uint64 iv) {
-  std::string counter_block(reinterpret_cast<char*>(&iv), sizeof(iv));
-  counter_block.append(DecryptConfig::kDecryptionKeySize - sizeof(iv), 0);
-  return counter_block;
-}
-
 WebMClusterParser::WebMClusterParser(int64 timecode_scale,
                                      int audio_track_num,
                                      int video_track_num,
                                      const std::string& video_encryption_key_id)
     : timecode_multiplier_(timecode_scale / 1000.0),
       video_encryption_key_id_(video_encryption_key_id),
       parser_(kWebMIdCluster, this),
       last_block_timecode_(-1),
       block_data_size_(-1),
       block_duration_(-1),
@@ skipping 246 matching lines @@
 
   buffers_.push_back(buffer);
   return true;
 }
 
 void WebMClusterParser::Track::Reset() {
   buffers_.clear();
 }
 
 }  // namespace media