| // 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/capture/video/shared_memory_buffer_tracker.h" |
| |
| #include "base/logging.h" |
| #include "ui/gfx/geometry/size.h" |
| |
| namespace { |
| |
| size_t CalculateRequiredBufferSize( |
| const gfx::Size& dimensions, |
| media::VideoPixelFormat format, |
| const media::mojom::PlaneStridesPtr& strides) { |
| if (strides) { |
| size_t result = 0u; |
| for (size_t plane_index = 0; |
| plane_index < media::VideoFrame::NumPlanes(format); plane_index++) { |
| result += |
| strides->stride_by_plane[plane_index] * |
| media::VideoFrame::Rows(plane_index, format, dimensions.height()); |
| } |
| return result; |
| } else { |
| return media::VideoCaptureFormat(dimensions, 0.0f, format) |
| .ImageAllocationSize(); |
| } |
| } |
| |
| } // namespace |
| |
| namespace media { |
| |
| SharedMemoryBufferTracker::SharedMemoryBufferTracker() = default; |
| |
| SharedMemoryBufferTracker::~SharedMemoryBufferTracker() = default; |
| |
| bool SharedMemoryBufferTracker::Init(const gfx::Size& dimensions, |
| VideoPixelFormat format, |
| const mojom::PlaneStridesPtr& strides) { |
| const size_t buffer_size = |
| CalculateRequiredBufferSize(dimensions, format, strides); |
| return provider_.InitForSize(buffer_size); |
| } |
| |
| bool SharedMemoryBufferTracker::IsReusableForFormat( |
| const gfx::Size& dimensions, |
| VideoPixelFormat format, |
| const mojom::PlaneStridesPtr& strides) { |
| return GetMemorySizeInBytes() >= |
| CalculateRequiredBufferSize(dimensions, format, strides); |
| } |
| |
| std::unique_ptr<VideoCaptureBufferHandle> |
| SharedMemoryBufferTracker::GetMemoryMappedAccess() { |
| return provider_.GetHandleForInProcessAccess(); |
| } |
| |
| mojo::ScopedSharedBufferHandle SharedMemoryBufferTracker::GetHandleForTransit( |
| bool read_only) { |
| return provider_.GetHandleForInterProcessTransit(read_only); |
| } |
| |
| base::SharedMemoryHandle |
| SharedMemoryBufferTracker::GetNonOwnedSharedMemoryHandleForLegacyIPC() { |
| return provider_.GetNonOwnedSharedMemoryHandleForLegacyIPC(); |
| } |
| |
| uint32_t SharedMemoryBufferTracker::GetMemorySizeInBytes() { |
| return provider_.GetMemorySizeInBytes(); |
| } |
| |
| } // namespace media |