Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/base/bit_reader.h

 // 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.
 
 #ifndef MEDIA_BASE_BIT_READER_H_
 #define MEDIA_BASE_BIT_READER_H_
 
 #include <stdint.h>
+#include <string>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "media/base/bit_reader_core.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 class MEDIA_EXPORT BitReader
     : NON_EXPORTED_BASE(private BitReaderCore::ByteStreamProvider)  {
  public:
   // Initialize the reader to start reading at |data|, |size| being size
   // of |data| in bytes.
   BitReader(const uint8_t* data, int size);
   ~BitReader() override;
 
   template<typename T> bool ReadBits(int num_bits, T* out) {
     return bit_reader_core_.ReadBits(num_bits, out);
   }
 
   bool ReadFlag(bool* flag) {
     return bit_reader_core_.ReadFlag(flag);
   }
 
+  // Read |num_bits| of binary data into |str|. |num_bits| must be a positive
+  // multiple of 8. This is not efficient for extracting large strings.
+  // If false is returned, |str| may not be valid.
+  bool ReadString(int num_bits, std::string* str);
+
   bool SkipBits(int num_bits) {
     return bit_reader_core_.SkipBits(num_bits);
   }
 
   int bits_available() const {
     return initial_size_ * 8 - bits_read();
   }
 
   int bits_read() const {
     return bit_reader_core_.bits_read();
@@ skipping 13 matching lines @@
   int bytes_left_;
 
   BitReaderCore bit_reader_core_;
 
   DISALLOW_COPY_AND_ASSIGN(BitReader);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_BIT_READER_H_