100 lines
2.9 KiB
C++
100 lines
2.9 KiB
C++
/*
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* Copyright (C) 2023 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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#pragma once
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#include <stdlib.h>
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#include <atomic>
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#include <condition_variable>
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#include <mutex>
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#include <queue>
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#include <thread>
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#include <android/hardware_buffer.h>
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#include <jpeglib.h>
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#include "Buffer.h"
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#include "FrameProvider.h"
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#include "Utils.h"
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// Manages converting from formats available directly from the camera to standardized formats that
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// transport mechanism eg: UVC over USB + host can understand.
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namespace android {
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namespace webcam {
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struct EncodeRequest {
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EncodeRequest() = default;
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EncodeRequest(HardwareBufferDesc& buffer, Buffer* producerBuffer)
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: srcBuffer(buffer), dstBuffer(producerBuffer) {}
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HardwareBufferDesc srcBuffer;
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Buffer* dstBuffer = nullptr;
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};
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struct I420 {
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std::unique_ptr<uint8_t[]> y;
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std::unique_ptr<uint8_t[]> u;
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std::unique_ptr<uint8_t[]> v;
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uint32_t yRowStride = 0;
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uint32_t uRowStride = 0;
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uint32_t vRowStride = 0;
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};
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class EncoderCallback {
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public:
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// Callback called by encoder into client when encoding is finished.
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virtual void onEncoded(Buffer* producerBuffer, HardwareBufferDesc& srcBuffer, bool success) = 0;
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virtual ~EncoderCallback() = default;
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};
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// Encoder for YUV_420_88 -> YUY2 / MJPEG conversion.
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class Encoder {
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public:
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Encoder(CameraConfig& config, EncoderCallback* cb);
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~Encoder();
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[[nodiscard]] bool isInited() const;
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void startEncoderThread();
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void queueRequest(EncodeRequest& request);
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private:
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// Main loop of the encoder thread. Calls EncoderCallback.onEncoded which might call back into
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// java, so encoder thread must be registered with the JVM.
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void encodeThreadLoop();
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void encode(EncodeRequest& request);
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int convertToI420(EncodeRequest& request);
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uint32_t i420ToJpeg(EncodeRequest& request);
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void encodeToMJpeg(EncodeRequest& request);
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void encodeToYUYV(EncodeRequest& request);
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static bool checkError(const char* msg, j_common_ptr jpeg_error_info_);
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std::mutex mRequestLock;
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std::queue<EncodeRequest> mRequestQueue; // guarded by mRequestLock
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std::condition_variable mRequestCondition; // guarded by mRequestLock
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std::thread mEncoderThread;
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CameraConfig mConfig;
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EncoderCallback* mCb = nullptr;
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volatile bool mContinueEncoding = true;
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bool mInited = false;
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I420 mI420;
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};
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} // namespace webcam
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} // namespace android
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