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

media/cast/test/simulator.cc

 // 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.
 
 // Simulate end to end streaming.
 //
 // Input:
 // --source=
 //   WebM used as the source of video and audio frames.
 // --output=
@@ skipping 200 matching lines @@
   CastLoggingEvent last_frame_event_type_;
   std::queue<scoped_refptr<media::VideoFrame> > video_frames_;
 
   DISALLOW_COPY_AND_ASSIGN(EncodedVideoFrameTracker);
 };
 
 // Appends a YUV frame in I420 format to the file located at |path|.
 void AppendYuvToFile(const base::FilePath& path,
                      scoped_refptr<media::VideoFrame> frame) {
   // Write YUV420 format to file.
-  std::string header = "FRAME\n";
+  std::string header;
+  base::StringAppendF(
+      &header, "FRAME W%d H%d\n",
+      frame->coded_size().width(),
+      frame->coded_size().height());
   AppendToFile(path, header.data(), header.size());
   AppendToFile(path,
       reinterpret_cast<char*>(frame->data(media::VideoFrame::kYPlane)),
       frame->stride(media::VideoFrame::kYPlane) *
           frame->rows(media::VideoFrame::kYPlane));
   AppendToFile(path,
       reinterpret_cast<char*>(frame->data(media::VideoFrame::kUPlane)),
       frame->stride(media::VideoFrame::kUPlane) *
           frame->rows(media::VideoFrame::kUPlane));
   AppendToFile(path,
@@ skipping 275 matching lines @@
   // Truncate YUV files to prepare for writing.
   if (!yuv_output_path.empty()) {
     base::ScopedFILE file(base::OpenFile(yuv_output_path, "wb"));
     if (!file.get()) {
       LOG(ERROR) << "Cannot save YUV output to file.";
       return;
     }
     LOG(INFO) << "Writing YUV output to file: " << yuv_output_path.value();
 
     // Write YUV4MPEG2 header.
-    std::string header;
-    base::StringAppendF(
-        &header, "YUV4MPEG2 W%d H%d F30000:1001 Ip A1:1 C420\n",
-        media_source.get_video_config().width,
-        media_source.get_video_config().height);
+    const std::string header("YUV4MPEG2 W1280 H720 F30000:1001 Ip A1:1 C420\n");
     AppendToFile(yuv_output_path, header.data(), header.size());
   }
 
   // Start sending.
   if (!source_path.empty()) {
     // 0 means using the FPS from the file.
     media_source.SetSourceFile(source_path,
                                GetIntegerSwitchValue(kSourceFrameRate, 0));
   }
   media_source.Start(cast_sender->audio_frame_input(),
@@ skipping 233 matching lines @@
   values.SetString("sim-id", sim_id);
 
   std::string extra_data;
   base::JSONWriter::Write(&values, &extra_data);
 
   // Run.
   media::cast::RunSimulation(source_path, log_output_path, metrics_output_path,
                              yuv_output_path, extra_data, model);
   return 0;
 }