// Copyright 2020 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/capture/video/mac/pixel_buffer_transferer_mac.h"

#include "base/check.h"
#include "base/logging.h"

namespace media {

PixelBufferTransferer::PixelBufferTransferer() {
  OSStatus error =
      VTPixelTransferSessionCreate(nil, transfer_session_.InitializeInto());
  // There is no known way to make session creation fail, so we do not deal with
  // failures gracefully.
  CHECK(error == noErr) << "Creating a VTPixelTransferSession failed: "
                        << error;
}

bool PixelBufferTransferer::TransferImage(CVPixelBufferRef source,
                                          CVPixelBufferRef destination) {
  DCHECK(source);
  DCHECK(destination);
  OSStatus error = VTPixelTransferSessionTransferImage(transfer_session_,
                                                       source, destination);
  if (error == kVTPixelTransferNotSupportedErr) {
    // This source/destination transfer operation is not supported.
    return false;
  }
  CHECK(error == noErr)
      << "Unexpected VTPixelTransferSessionTransferImage error: " << error;
  return true;
}

PixelBufferTransferer::~PixelBufferTransferer() {
  VTPixelTransferSessionInvalidate(transfer_session_);
}

}  // namespace media