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// Copyright 2019 The MediaPipe Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "mediapipe/framework/calculator_framework.h"
#include "mediapipe/framework/formats/image_frame.h"
#include "mediapipe/framework/port/ret_check.h"
#include "mediapipe/framework/port/status.h"
#define HAVE_GPU_BUFFER
#ifdef __APPLE__
#include "mediapipe/objc/util.h"
#endif
#include "mediapipe/gpu/gl_calculator_helper.h"
namespace mediapipe {
// Convert an input image (GpuBuffer or ImageFrame) to ImageFrame.
class GpuBufferToImageFrameCalculator : public CalculatorBase {
public:
GpuBufferToImageFrameCalculator() {}
static ::mediapipe::Status GetContract(CalculatorContract* cc);
::mediapipe::Status Open(CalculatorContext* cc) override;
::mediapipe::Status Process(CalculatorContext* cc) override;
private:
#if !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
GlCalculatorHelper helper_;
#endif // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
};
REGISTER_CALCULATOR(GpuBufferToImageFrameCalculator);
// static
::mediapipe::Status GpuBufferToImageFrameCalculator::GetContract(
CalculatorContract* cc) {
cc->Inputs().Index(0).SetAny();
cc->Outputs().Index(0).Set<ImageFrame>();
// Note: we call this method even on platforms where we don't use the helper,
// to ensure the calculator's contract is the same. In particular, the helper
// enables support for the legacy side packet, which several graphs still use.
RETURN_IF_ERROR(GlCalculatorHelper::UpdateContract(cc));
return ::mediapipe::OkStatus();
}
::mediapipe::Status GpuBufferToImageFrameCalculator::Open(
CalculatorContext* cc) {
// Inform the framework that we always output at the same timestamp
// as we receive a packet at.
cc->SetOffset(TimestampDiff(0));
#if !MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
RETURN_IF_ERROR(helper_.Open(cc));
#endif // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
return ::mediapipe::OkStatus();
}
::mediapipe::Status GpuBufferToImageFrameCalculator::Process(
CalculatorContext* cc) {
if (cc->Inputs().Index(0).Value().ValidateAsType<ImageFrame>().ok()) {
cc->Outputs().Index(0).AddPacket(cc->Inputs().Index(0).Value());
return ::mediapipe::OkStatus();
}
#ifdef HAVE_GPU_BUFFER
if (cc->Inputs().Index(0).Value().ValidateAsType<GpuBuffer>().ok()) {
const auto& input = cc->Inputs().Index(0).Get<GpuBuffer>();
#if MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
std::unique_ptr<ImageFrame> frame =
CreateImageFrameForCVPixelBuffer(input.GetCVPixelBufferRef());
cc->Outputs().Index(0).Add(frame.release(), cc->InputTimestamp());
#else
helper_.RunInGlContext([this, &input, &cc]() {
auto src = helper_.CreateSourceTexture(input);
std::unique_ptr<ImageFrame> frame = absl::make_unique<ImageFrame>(
ImageFormatForGpuBufferFormat(input.format()), src.width(),
src.height(), ImageFrame::kGlDefaultAlignmentBoundary);
helper_.BindFramebuffer(src);
const auto info = GlTextureInfoForGpuBufferFormat(input.format(), 0);
glReadPixels(0, 0, src.width(), src.height(), info.gl_format,
info.gl_type, frame->MutablePixelData());
glFlush();
cc->Outputs().Index(0).Add(frame.release(), cc->InputTimestamp());
src.Release();
});
#endif // MEDIAPIPE_GPU_BUFFER_USE_CV_PIXEL_BUFFER
return ::mediapipe::OkStatus();
}
#endif // defined(HAVE_GPU_BUFFER)
return ::mediapipe::Status(::mediapipe::StatusCode::kInvalidArgument,
"Input packets must be ImageFrame or GpuBuffer.");
}
} // namespace mediapipe
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