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// 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/base/win/mf_helpers.h"
#include "base/check_op.h"
namespace media {
Microsoft::WRL::ComPtr<IMFSample> CreateEmptySampleWithBuffer(
uint32_t buffer_length,
int align) {
CHECK_GT(buffer_length, 0U);
Microsoft::WRL::ComPtr<IMFSample> sample;
HRESULT hr = MFCreateSample(&sample);
RETURN_ON_HR_FAILURE(hr, "MFCreateSample failed",
Microsoft::WRL::ComPtr<IMFSample>());
Microsoft::WRL::ComPtr<IMFMediaBuffer> buffer;
if (align == 0) {
// Note that MFCreateMemoryBuffer is same as MFCreateAlignedMemoryBuffer
// with the align argument being 0.
hr = MFCreateMemoryBuffer(buffer_length, &buffer);
} else {
hr = MFCreateAlignedMemoryBuffer(buffer_length, align - 1, &buffer);
}
RETURN_ON_HR_FAILURE(hr, "Failed to create memory buffer for sample",
Microsoft::WRL::ComPtr<IMFSample>());
hr = sample->AddBuffer(buffer.Get());
RETURN_ON_HR_FAILURE(hr, "Failed to add buffer to sample",
Microsoft::WRL::ComPtr<IMFSample>());
buffer->SetCurrentLength(0);
return sample;
}
MediaBufferScopedPointer::MediaBufferScopedPointer(IMFMediaBuffer* media_buffer)
: media_buffer_(media_buffer),
buffer_(nullptr),
max_length_(0),
current_length_(0) {
HRESULT hr = media_buffer_->Lock(&buffer_, &max_length_, ¤t_length_);
CHECK(SUCCEEDED(hr));
}
MediaBufferScopedPointer::~MediaBufferScopedPointer() {
HRESULT hr = media_buffer_->Unlock();
CHECK(SUCCEEDED(hr));
}
DXGIDeviceScopedHandle::DXGIDeviceScopedHandle(
IMFDXGIDeviceManager* device_manager)
: device_manager_(device_manager) {}
DXGIDeviceScopedHandle::~DXGIDeviceScopedHandle() {
if (device_handle_ != INVALID_HANDLE_VALUE) {
HRESULT hr = device_manager_->CloseDeviceHandle(device_handle_);
CHECK(SUCCEEDED(hr));
device_handle_ = INVALID_HANDLE_VALUE;
}
}
HRESULT DXGIDeviceScopedHandle::LockDevice(REFIID riid, void** device_out) {
HRESULT hr;
if (device_handle_ == INVALID_HANDLE_VALUE) {
hr = device_manager_->OpenDeviceHandle(&device_handle_);
if (FAILED(hr)) {
return hr;
}
}
// see
// https://docs.microsoft.com/en-us/windows/win32/api/mfobjects/nf-mfobjects-imfdxgidevicemanager-lockdevice
// for details of LockDevice call.
hr = device_manager_->LockDevice(device_handle_, riid, device_out,
/*block=*/FALSE);
return hr;
}
} // namespace media
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