75 lines
2.9 KiB
C++
75 lines
2.9 KiB
C++
// Copyright 2019 The MediaPipe Authors.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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#include "mediapipe/framework/api2/node.h"
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#include "mediapipe/framework/calculator_framework.h"
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#include "mediapipe/framework/formats/image_frame.h"
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#include "mediapipe/framework/port/status.h"
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#include "mediapipe/gpu/gl_calculator_helper.h"
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namespace mediapipe {
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namespace api2 {
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class ImageFrameToGpuBufferCalculator
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: public RegisteredNode<ImageFrameToGpuBufferCalculator> {
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public:
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static constexpr Input<ImageFrame> kIn{""};
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static constexpr Output<GpuBuffer> kOut{""};
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MEDIAPIPE_NODE_INTERFACE(ImageFrameToGpuBufferCalculator, kIn, kOut);
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static absl::Status UpdateContract(CalculatorContract* cc);
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absl::Status Open(CalculatorContext* cc) override;
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absl::Status Process(CalculatorContext* cc) override;
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private:
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GlCalculatorHelper helper_;
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};
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// static
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absl::Status ImageFrameToGpuBufferCalculator::UpdateContract(
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CalculatorContract* cc) {
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// Note: we call this method even on platforms where we don't use the helper,
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// to ensure the calculator's contract is the same. In particular, the helper
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// enables support for the legacy side packet, which several graphs still use.
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return GlCalculatorHelper::UpdateContract(cc);
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}
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absl::Status ImageFrameToGpuBufferCalculator::Open(CalculatorContext* cc) {
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MP_RETURN_IF_ERROR(helper_.Open(cc));
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return absl::OkStatus();
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}
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absl::Status ImageFrameToGpuBufferCalculator::Process(CalculatorContext* cc) {
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auto image_frame = std::const_pointer_cast<ImageFrame>(
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mediapipe::SharedPtrWithPacket<ImageFrame>(kIn(cc).packet()));
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auto gpu_buffer = api2::MakePacket<GpuBuffer>(
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std::make_shared<mediapipe::GpuBufferStorageImageFrame>(
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std::move(image_frame)))
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.At(cc->InputTimestamp());
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// This calculator's behavior has been to do the texture upload eagerly, and
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// some graphs may rely on running this on a separate GL context to avoid
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// blocking another context with the read operation. So let's request GPU
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// access here to ensure that the behavior stays the same.
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// TODO: have a better way to do this, or defer until later.
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helper_.RunInGlContext(
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[&gpu_buffer] { auto view = gpu_buffer->GetReadView<GlTextureView>(0); });
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kOut(cc).Send(std::move(gpu_buffer));
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return absl::OkStatus();
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}
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} // namespace api2
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} // namespace mediapipe
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