Use maximum capacity instead of a ratio of capacity for BufferedResourceLoader.

webkit/media/buffered_resource_loader.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 WEBKIT_MEDIA_BUFFERED_RESOURCE_LOADER_H_
 #define WEBKIT_MEDIA_BUFFERED_RESOURCE_LOADER_H_
 
 #include <string>
 
 #include "base/callback.h"
@@ skipping 13 matching lines @@
 }
 
 namespace webkit_media {
 
 const int64 kPositionNotSpecified = -1;
 
 const char kHttpScheme[] = "http";
 const char kHttpsScheme[] = "https";
 const char kDataScheme[] = "data";
 
-// This class works inside demuxer thread and render thread. It contains a
-// WebURLLoader and does the actual resource loading. This object does
-// buffering internally, it defers the resource loading if buffer is full
-// and un-defers the resource loading if it is under buffered.
+// Wraps a WebURLLoader to maintain an in-memory buffer of downloaded
+// data according to the current defer strategy.
 class BufferedResourceLoader : public WebKit::WebURLLoaderClient {
  public:
   // kNeverDefer - Aggresively buffer; never defer loading while paused.
   // kReadThenDefer - Request only enough data to fulfill read requests.
-  // kThresholdDefer - Try to keep amount of buffered data at a threshold.
+  // kCapacityDefer - Try to keep amount of buffered data at capacity.
   enum DeferStrategy {
     kNeverDefer,
     kReadThenDefer,
-    kThresholdDefer,
+    kCapacityDefer,
   };
 
   // Status codes for start/read operations on BufferedResourceLoader.
   enum Status {
     // Everything went as planned.
     kOk,
 
     // The operation failed, which may have been due to:
     //   - Page navigation
     //   - Server replied 4xx/5xx
@@ skipping 115 matching lines @@
 
   // Returns true if the media resource has a single origin, false otherwise.
   // Only valid to call after Start() has completed.
   bool HasSingleOrigin() const;
 
   // Returns true if the media resource passed a CORS access control check.
   // Only valid to call after Start() has completed.
   bool DidPassCORSAccessCheck() const;
 
   // Sets the defer strategy to the given value unless it seems unwise.
-  // Specifically downgrade kNeverDefer to kThresholdDefer if we know the
+  // Specifically downgrade kNeverDefer to kCapacityDefer if we know the
   // current response will not be used to satisfy future requests (the cache
   // won't help us).
   void UpdateDeferStrategy(DeferStrategy strategy);
 
   // Sets the playback rate to the given value and updates buffer window
   // accordingly.
   void SetPlaybackRate(float playback_rate);
 
   // Sets the bitrate to the given value and updates buffer window
   // accordingly.
@@ skipping 137 matching lines @@
   float playback_rate_;
 
   scoped_refptr<media::MediaLog> media_log_;
 
   DISALLOW_COPY_AND_ASSIGN(BufferedResourceLoader);
 };
 
 }  // namespace webkit_media
 
 #endif  // WEBKIT_MEDIA_BUFFERED_RESOURCE_LOADER_H_