Fix Cast Streaming regression caused by enabling H264 HW encoder on Mac.

chrome/renderer/media/cast_rtp_stream.cc

 // Copyright 2013 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 "chrome/renderer/media/cast_rtp_stream.h"
 
 #include <stdint.h>
 #include <algorithm>
 #include <utility>
 
@@ skipping 104 matching lines @@
 }
 
 bool IsHardwareH264EncodingSupported() {
   const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   if (cmd_line->HasSwitch(switches::kDisableCastStreamingHWEncoding)) {
     DVLOG(1) << "Disabled hardware h264 support for Cast Streaming.";
     return false;
   }
 
   // Query for hardware H.264 encoder support.
+  //
+  // TODO(miu): Look into why H.264 hardware encoder on MacOS is broken.
+  // http://crbug.com/596674
+#if !defined(OS_MACOSX)
   const std::vector<media::VideoEncodeAccelerator::SupportedProfile>
       vea_profiles = content::GetSupportedVideoEncodeAcceleratorProfiles();
   for (const auto& vea_profile : vea_profiles) {
     if (vea_profile.profile >= media::H264PROFILE_MIN &&
         vea_profile.profile <= media::H264PROFILE_MAX) {
       return true;
     }
   }
+#endif  // !defined(OS_MACOSX)
   return false;
 }
 
 int NumberOfEncodeThreads() {
   // Do not saturate CPU utilization just for encoding. On a lower-end system
   // with only 1 or 2 cores, use only one thread for encoding. On systems with
   // more cores, allow half of the cores to be used for encoding.
   return std::min(8, (base::SysInfo::NumberOfProcessors() + 1) / 2);
 }
 
@@ skipping 500 matching lines @@
   DCHECK(content::RenderThread::Get());
   DVLOG(1) << "CastRtpStream::DidEncounterError(" << message << ") = "
            << (IsAudio() ? "audio" : "video");
   // Save the WeakPtr first because the error callback might delete this object.
   base::WeakPtr<CastRtpStream> ptr = weak_factory_.GetWeakPtr();
   error_callback_.Run(message);
   base::ThreadTaskRunnerHandle::Get()->PostTask(
       FROM_HERE,
       base::Bind(&CastRtpStream::Stop, ptr));
 }