Add live mode detection in WebM MediaSource parser.

media/base/video_decoder_config.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_VIDEO_DECODER_CONFIG_H_
 #define MEDIA_BASE_VIDEO_DECODER_CONFIG_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 63 matching lines @@
 
   // Constructs an initialized object. It is acceptable to pass in NULL for
   // |extra_data|, otherwise the memory is copied.
   VideoDecoderConfig(VideoCodec codec,
                      VideoCodecProfile profile,
                      VideoFrame::Format format,
                      const gfx::Size& coded_size,
                      const gfx::Rect& visible_rect,
                      const gfx::Size& natural_size,
                      const uint8* extra_data, size_t extra_data_size,
-                     bool is_encrypted);
+                     bool is_encrypted,
+                     bool low_delay);
 
   ~VideoDecoderConfig();
 
   // Resets the internal state of this object.
   void Initialize(VideoCodec codec,
                   VideoCodecProfile profile,
                   VideoFrame::Format format,
                   const gfx::Size& coded_size,
                   const gfx::Rect& visible_rect,
                   const gfx::Size& natural_size,
                   const uint8* extra_data, size_t extra_data_size,
                   bool is_encrypted,
+                  bool low_delay,
                   bool record_stats);
 
   // Returns true if this object has appropriate configuration values, false
   // otherwise.
   bool IsValidConfig() const;
 
   // Returns true if all fields in |config| match this config.
   // Note: The contents of |extra_data_| are compared not the raw pointers.
   bool Matches(const VideoDecoderConfig& config) const;
 
@@ skipping 21 matching lines @@
   // Optional byte data required to initialize video decoders, such as H.264
   // AAVC data.
   const uint8* extra_data() const;
   size_t extra_data_size() const;
 
   // Whether the video stream is potentially encrypted.
   // Note that in a potentially encrypted video stream, individual buffers
   // can be encrypted or not encrypted.
   bool is_encrypted() const;
 
+  // Indicates that the decoder should minimized delay (e.g. for a live stream).
+  bool low_delay() const;

[Sergey Ulanov, 2014/04/24 02:55:14]

Can we make individual fields mutable? (i.e. add set_low_delay() here) It would
make this change much smaller (and any other change that adds new fields in the
config).

+
  private:
   VideoCodec codec_;
   VideoCodecProfile profile_;
 
   VideoFrame::Format format_;
 
   gfx::Size coded_size_;
   gfx::Rect visible_rect_;
   gfx::Size natural_size_;
 
   std::vector<uint8> extra_data_;
 
   bool is_encrypted_;
 
+  bool low_delay_;
+
   // Not using DISALLOW_COPY_AND_ASSIGN here intentionally to allow the compiler
   // generated copy constructor and assignment operator. Since the extra data is
   // typically small, the performance impact is minimal.
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_DECODER_CONFIG_H_