Cast: Update simulator tool with more inputs.

media/cast/receiver/video_decoder.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.
 
 #include "media/cast/receiver/video_decoder.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/json/json_reader.h"
 #include "base/location.h"
@@ skipping 166 matching lines @@
         last_decoded_id_(-1) {
     if (ImplBase::cast_initialization_status_ != STATUS_VIDEO_UNINITIALIZED)
       return;
     ImplBase::cast_initialization_status_ = STATUS_VIDEO_INITIALIZED;
   }
 
  private:
   virtual ~FakeImpl() {}
 
   virtual scoped_refptr<VideoFrame> Decode(uint8* data, int len) OVERRIDE {
+    // Make sure this is a JSON string.
+    if (!len || data[0] != '{')
+      return NULL;
     base::JSONReader reader;
     scoped_ptr<base::Value> values(
-        reader.Read(base::StringPiece(reinterpret_cast<char*>(data))));
+        reader.Read(base::StringPiece(reinterpret_cast<char*>(data), len)));
+    if (!values)
+      return NULL;
     base::DictionaryValue* dict = NULL;
     values->GetAsDictionary(&dict);
 
     bool key = false;
     int id = 0;
     int ref = 0;
     dict->GetBoolean("key", &key);
     dict->GetInteger("id", &id);
     dict->GetInteger("ref", &ref);
     DCHECK(id == last_decoded_id_ + 1);
@@ skipping 50 matching lines @@
   cast_environment_->PostTask(CastEnvironment::VIDEO,
                               FROM_HERE,
                               base::Bind(&VideoDecoder::ImplBase::DecodeFrame,
                                          impl_,
                                          base::Passed(&encoded_frame),
                                          callback));
 }
 
 }  // namespace cast
 }  // namespace media