[Cast] Software encoder support for varying video frame sizes.

media/cast/test/fake_media_source.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.
 
 // A fake media source that generates video and audio frames to a cast
 // sender.
 // This class can transcode a WebM file using FFmpeg. It can also
 // generate an animation and audio of fixed frequency.
 
 #ifndef MEDIA_CAST_TEST_FAKE_MEDIA_SOURCE_H_
@@ skipping 39 matching lines @@
   FakeMediaSource(scoped_refptr<base::SingleThreadTaskRunner> task_runner,
                   base::TickClock* clock,
                   const VideoSenderConfig& video_config,
                   bool keep_frames);
   ~FakeMediaSource();
 
   // Transcode this file as the source of video and audio frames.
   // If |override_fps| is non zero then the file is played at the desired rate.
   void SetSourceFile(const base::FilePath& video_file, int override_fps);
 
+  // Set to true to randomly change the frame size at random points in time.
+  // Only applies when SetSourceFile() is not used.
+  void SetVariableFrameSizeMode(bool enabled);
+
   void Start(scoped_refptr<AudioFrameInput> audio_frame_input,
              scoped_refptr<VideoFrameInput> video_frame_input);
 
   const VideoSenderConfig& get_video_config() const { return video_config_; }
 
   scoped_refptr<media::VideoFrame> PopOldestInsertedVideoFrame();
 
  private:
   bool is_transcoding_audio() const { return audio_stream_index_ >= 0; }
   bool is_transcoding_video() const { return video_stream_index_ >= 0; }
 
   void SendNextFrame();
   void SendNextFakeFrame();
 
+  void UpdateNextFrameSize();
+
   // Return true if a frame was sent.
   bool SendNextTranscodedVideo(base::TimeDelta elapsed_time);
 
   // Return true if a frame was sent.
   bool SendNextTranscodedAudio(base::TimeDelta elapsed_time);
 
   // Helper methods to compute timestamps for the frame number specified.
   base::TimeDelta VideoFrameTime(int frame_number);
 
   base::TimeDelta ScaleTimestamp(base::TimeDelta timestamp);
@@ skipping 13 matching lines @@
   void ProvideData(int frame_delay, media::AudioBus* output_bus);
 
   AVStream* av_audio_stream();
   AVStream* av_video_stream();
   AVCodecContext* av_audio_context();
   AVCodecContext* av_video_context();
 
   const scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
   const VideoSenderConfig video_config_;
   const bool keep_frames_;
+  bool variable_frame_size_mode_;
+  gfx::Size current_frame_size_;
+  base::TimeTicks next_frame_size_change_time_;
   scoped_refptr<AudioFrameInput> audio_frame_input_;
   scoped_refptr<VideoFrameInput> video_frame_input_;
   uint8 synthetic_count_;
   base::TickClock* const clock_;  // Not owned by this class.
 
   // Time when the stream starts.
   base::TimeTicks start_time_;
 
   // The following three members are used only for fake frames.
   int audio_frame_count_;  // Each audio frame is exactly 10ms.
@@ skipping 33 matching lines @@
   // NOTE: Weak pointers must be invalidated before all other member variables.
   base::WeakPtrFactory<FakeMediaSource> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(FakeMediaSource);
 };
 
 }  // namespace cast
 }  // namespace media
 
 #endif // MEDIA_CAST_TEST_FAKE_MEDIA_SOURCE_H_