Reduce boilerplate when creating simple mojom::URLLoaders.

media/mojo/common/mojo_decoder_buffer_converter.cc

 // Copyright 2016 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/mojo/common/mojo_decoder_buffer_converter.h"
 
 #include <memory>
 
 #include "base/logging.h"
 #include "base/memory/ptr_util.h"
 #include "base/single_thread_task_runner.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "media/base/audio_buffer.h"
 #include "media/base/cdm_context.h"
 #include "media/base/decoder_buffer.h"
 #include "media/mojo/common/media_type_converters.h"
 
 namespace media {
 
 namespace {
 
 std::unique_ptr<mojo::DataPipe> CreateDataPipe(DemuxerStream::Type type) {
-  MojoCreateDataPipeOptions options;
-  options.struct_size = sizeof(MojoCreateDataPipeOptions);
-  options.flags = MOJO_CREATE_DATA_PIPE_OPTIONS_FLAG_NONE;
-  options.element_num_bytes = 1;
+  uint32_t capacity = 0;
 
   if (type == DemuxerStream::AUDIO) {
     // TODO(timav): Consider capacity calculation based on AudioDecoderConfig.
-    options.capacity_num_bytes = 512 * 1024;
+    capacity = 512 * 1024;
   } else if (type == DemuxerStream::VIDEO) {
     // Video can get quite large; at 4K, VP9 delivers packets which are ~1MB in
     // size; so allow for some head room.
     // TODO(xhwang, sandersd): Provide a better way to customize this value.
-    options.capacity_num_bytes = 2 * (1024 * 1024);
+    capacity = 2 * (1024 * 1024);
   } else {
     NOTREACHED() << "Unsupported type: " << type;
     // Choose an arbitrary size.
-    options.capacity_num_bytes = 512 * 1024;
+    capacity = 512 * 1024;
   }
 
-  return base::MakeUnique<mojo::DataPipe>(options);
+  return base::MakeUnique<mojo::DataPipe>(capacity);
 }
 
 bool IsPipeReadWriteError(MojoResult result) {
   return result != MOJO_RESULT_OK && result != MOJO_RESULT_SHOULD_WAIT;
 }
 
 }  // namespace
 
 // MojoDecoderBufferReader
 
@@ skipping 236 matching lines @@
         media_buffer_ = nullptr;
         bytes_written_ = 0;
       }
     }
   }
 
   return result;
 }
 
 }  // namespace media