Convert MediaLog from being ref counted to owned by WebMediaPlayer.

media/formats/mp4/box_reader.h

 // Copyright 2014 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_FORMATS_MP4_BOX_READER_H_
 #define MEDIA_FORMATS_MP4_BOX_READER_H_
 
 #include <stdint.h>
 
 #include <limits>
@@ skipping 83 matching lines @@
   ~BoxReader();
 
   // Create a BoxReader from a buffer. Note that this function may return NULL
   // if an intact, complete box was not available in the buffer. If |*err| is
   // set, there was a stream-level error when creating the box; otherwise, NULL
   // values are only expected when insufficient data is available.
   //
   // |buf| is retained but not owned, and must outlive the BoxReader instance.
   static BoxReader* ReadTopLevelBox(const uint8_t* buf,
                                     const size_t buf_size,
-                                    const scoped_refptr<MediaLog>& media_log,
+                                    MediaLog* media_log,
                                     bool* err);
 
   // Read the box header from the current buffer. This function returns true if
   // there is enough data to read the header and the header is sane; that is, it
   // does not check to ensure the entire box is in the buffer before returning
   // true. The semantics of |*err| are the same as above.
   //
   // |buf| is not retained.
   static bool StartTopLevelBox(const uint8_t* buf,
                                const size_t buf_size,
-                               const scoped_refptr<MediaLog>& media_log,
+                               MediaLog* media_log,
                                FourCC* type,
                                size_t* box_size,
                                bool* err) WARN_UNUSED_RESULT;
 
   // Create a BoxReader from a buffer. |buf| must be the complete buffer, as
   // errors are returned when sufficient data is not available. |buf| can start
   // with any type of box -- it does not have to be IsValidTopLevelBox().
   //
   // |buf| is retained but not owned, and must outlive the BoxReader instance.
   static BoxReader* ReadConcatentatedBoxes(const uint8_t* buf,
                                            const size_t buf_size);
 
   // Returns true if |type| is recognized to be a top-level box, false
   // otherwise. This returns true for some boxes which we do not parse.
   // Helpful in debugging misaligned appends.
-  static bool IsValidTopLevelBox(const FourCC& type,
-                                 const scoped_refptr<MediaLog>& media_log);
+  static bool IsValidTopLevelBox(const FourCC& type, MediaLog* media_log);
 
   // Scan through all boxes within the current box, starting at the current
   // buffer position. Must be called before any of the *Child functions work.
   bool ScanChildren() WARN_UNUSED_RESULT;
 
   // Return true if child with type |child.BoxType()| exists.
   bool HasChild(Box* child) WARN_UNUSED_RESULT;
 
   // Read exactly one child box from the set of children. The type of the child
   // will be determined by the BoxType() method of |child|.
@@ skipping 33 matching lines @@
 
   size_t box_size() const {
     DCHECK(box_size_known_);
     return box_size_;
   }
 
   FourCC type() const   { return type_; }
   uint8_t version() const { return version_; }
   uint32_t flags() const { return flags_; }
 
-  const scoped_refptr<MediaLog>& media_log() const { return media_log_; }
+  MediaLog* media_log() const { return media_log_; }
 
  private:
   // Create a BoxReader from |buf|. |is_EOS| should be true if |buf| is
   // complete stream (i.e. no additional data is expected to be appended).
   BoxReader(const uint8_t* buf,
             const size_t buf_size,
-            const scoped_refptr<MediaLog>& media_log,
+            MediaLog* media_log,
             bool is_EOS);
 
   // Must be called immediately after init. If the return is false, this
   // indicates that the box header and its contents were not available in the
   // stream or were nonsensical, and that the box must not be used further. In
   // this case, if |*err| is false, the problem was simply a lack of data, and
   // should only be an error condition if some higher-level component knows that
   // no more data is coming (i.e. EOS or end of containing box). If |*err| is
   // true, the error is unrecoverable and the stream should be aborted.
   bool ReadHeader(bool* err);
 
   // Read all children, optionally checking FourCC. Returns true if all
   // children are successfully parsed and, if |check_box_type|, have the
   // correct box type for |T|. Note that this method is mutually exclusive
   // with ScanChildren().
   template <typename T>
   bool ReadAllChildrenInternal(std::vector<T>* children, bool check_box_type);
 
-  scoped_refptr<MediaLog> media_log_;
+  MediaLog* media_log_;
   size_t box_size_;
   bool box_size_known_;
   FourCC type_;
   uint8_t version_;
   uint32_t flags_;
 
   typedef std::multimap<FourCC, BoxReader> ChildMap;
 
   // The set of child box FourCCs and their corresponding buffer readers. Only
   // valid if scanned_ is true.
@@ skipping 66 matching lines @@
     pos_ += child_reader.box_size();
   }
 
   return !err;
 }
 
 }  // namespace mp4
 }  // namespace media
 
 #endif  // MEDIA_FORMATS_MP4_BOX_READER_H_