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94 lines
2.9 KiB
94 lines
2.9 KiB
4 months ago
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/*
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* Copyright (C) 2016 The Android Open Source Project
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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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*/
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#ifndef ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_VIDEOCAPTURE_H
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#define ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_1_VIDEOCAPTURE_H
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#include <atomic>
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#include <functional>
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#include <set>
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#include <thread>
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#include <linux/videodev2.h>
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typedef v4l2_buffer imageBuffer;
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class VideoCapture {
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public:
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bool open(const char* deviceName, const int32_t width = 0, const int32_t height = 0);
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void close();
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bool startStream(std::function<void(VideoCapture*, imageBuffer*, void*)> callback = nullptr);
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void stopStream();
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// Valid only after open()
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__u32 getWidth() { return mWidth; };
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__u32 getHeight() { return mHeight; };
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__u32 getStride() { return mStride; };
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__u32 getV4LFormat() { return mFormat; };
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// NULL until stream is started
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void* getLatestData() {
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if (mFrames.empty()) {
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// No frame is available
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return nullptr;
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}
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// Return a pointer to the buffer captured most recently
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const int latestBufferId = *mFrames.end();
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return mPixelBuffers[latestBufferId];
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}
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bool isFrameReady() { return !mFrames.empty(); }
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void markFrameConsumed(int id) { returnFrame(id); }
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bool isOpen() { return mDeviceFd >= 0; }
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int setParameter(struct v4l2_control& control);
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int getParameter(struct v4l2_control& control);
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std::set<uint32_t> enumerateCameraControls();
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private:
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void collectFrames();
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bool returnFrame(int id);
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int mDeviceFd = -1;
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int mNumBuffers = 0;
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std::unique_ptr<v4l2_buffer[]> mBufferInfos = nullptr;
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std::unique_ptr<void*[]> mPixelBuffers = nullptr;
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__u32 mFormat = 0;
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__u32 mWidth = 0;
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__u32 mHeight = 0;
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__u32 mStride = 0;
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std::function<void(VideoCapture*, imageBuffer*, void*)> mCallback;
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std::thread mCaptureThread; // The thread we'll use to dispatch frames
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std::atomic<int> mRunMode; // Used to signal the frame loop (see RunModes below)
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std::set<int> mFrames; // Set of available frame buffers
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// Careful changing these -- we're using bit-wise ops to manipulate these
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enum RunModes {
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STOPPED = 0,
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RUN = 1,
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STOPPING = 2,
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};
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};
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#endif // ANDROID_HARDWARE_AUTOMOTIVE_EVS_V1_0_VIDEOCAPTURE_
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