Use base::Optional<int32_t> in H264POC::ComputePicOrderCnt(...)

media/gpu/vt_video_decode_accelerator_mac.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/gpu/vt_video_decode_accelerator_mac.h"
 
 #include <CoreVideo/CoreVideo.h>
 #include <OpenGL/CGLIOSurface.h>
 #include <OpenGL/gl.h>
 #include <stddef.h>
@@ skipping 604 matching lines @@
 
           // Record the configuration.
           // TODO(sandersd): Ideally this would be skipped if we know there
           // have not been any parameter sets since the last frame.
           active_sps_ = last_sps_;
           active_spsext_ = last_spsext_;
           active_pps_ = last_pps_;
 
           // Compute and store frame properties. |image_size| gets filled in
           // later, since it comes from the decoder configuration.
-          int32_t pic_order_cnt;
-          if (!poc_.ComputePicOrderCnt(sps, slice_hdr, &pic_order_cnt)) {
+          base::Optional<int32_t> pic_order_cnt =
+              poc_.ComputePicOrderCnt(sps, slice_hdr);
+          if (!pic_order_cnt.has_value()) {
             DLOG(ERROR) << "Unable to compute POC";
             NotifyError(UNREADABLE_INPUT, SFT_INVALID_STREAM);
             return;
           }
 
           frame->has_slice = true;
           frame->is_idr = nalu.nal_unit_type == media::H264NALU::kIDRSlice;
           frame->has_mmco5 = poc_.IsPendingMMCO5();
-          frame->pic_order_cnt = pic_order_cnt;
+          frame->pic_order_cnt = *pic_order_cnt;
           frame->reorder_window = ComputeReorderWindow(sps);
         }
 
       // Intentional fallthrough.
       default:
         nalus.push_back(nalu);
         data_size += kNALUHeaderLength + nalu.size;
         break;
     }
   }
@@ skipping 580 matching lines @@
     SupportedProfile profile;
     profile.profile = supported_profile;
     profile.min_resolution.SetSize(16, 16);
     profile.max_resolution.SetSize(4096, 2160);
     profiles.push_back(profile);
   }
   return profiles;
 }
 
 }  // namespace media