media: recycle buffers/direct rendering etc. (third patch)

media/base/limits.h

-// Copyright (c) 2009 The Chromium Authors. All rights reserved.
+// Copyright (c) 2010 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.
 
 // Contains limit definition constants for the media subsystem.
 
 #ifndef MEDIA_BASE_LIMITS_H_
 #define MEDIA_BASE_LIMITS_H_
 
 #include "base/basictypes.h"
 
 namespace media {
 
 struct Limits {
   // For video.
   static const size_t kMaxDimension = (1 << 15) - 1;  // 32767
   static const size_t kMaxCanvas = (1 << (14 * 2));  // 16384 x 16384
 
+  // Total number of video frames which are populating in the pipeline.
+  static const size_t kMaxVideoFrames = 4;
+
   // Following limits are used by AudioParameters::IsValid().
   // The 192 Khz constant is the frequency of quicktime lossless audio codec.
   // MP4 is limited to 96 Khz, and mp3 is limited to 48 Khz.
   // OGG vorbis was initially limited to 96 Khz, but recent tools are unlimited.
   // 192 Khz is also the limit on most PC audio hardware.
   static const int kMaxSampleRate = 192000;
   static const int kMaxChannels = 32;
   static const int kMaxBitsPerSample = 64;
 
   // Maximum possible time.
   static const int64 kMaxTimeInMicroseconds = kint64max;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_LIMITS_H_