[RK3288][Android6.0] 调试笔记 --- Camera HAL固定fps的方法

2019-11-09 15:19:59

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Platform: RK3288OS: Android 6.0Kernel: 3.10.92为了降低cpu使用率, 就从降低fps入手.理论上可以通过正常的ioctl接口去操作:CameraUSBAdapter.cpp:CameraUSBAdapter::initDefaultParameters(int camFd){...... memset(&setfps, 0, sizeof(struct v4l2_streamparm)); setfps.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; setfps.parm.capture.timeperframe.numerator=1; setfps.parm.capture.timeperframe.denominator=fps_max; //修改此行 ret = ioctl(mCamFd, VIDIOC_S_PARM, &setfps); ......}或者修改这里面的int CameraUSBAdapter::cameraConfig(const CameraParameters &tmpparams,bool isInit,bool &isRestartValue){...... setfps.type = V4L2_BUF_TYPE_VIDEO_CAPTURE; setfps.parm.capture.timeperframe.numerator=1; setfps.parm.capture.timeperframe.denominator=params.getPReviewFrameRate(); err = ioctl(mCamFd, VIDIOC_S_PARM, &setfps); ......}但从log看到,当前使用的uvc camera帧率是固定无法修改:D CameraHal: initDefaultParameters(540): Support Preview FPS range: (30000,30000)只支持30fps,因此从HAL层下手,kernel帧率不变, HAL层丢弃一些帧,比如我要15fps, 改动如下:CameraAdapter.cpp:int CameraAdapter::getFrame(FramInfo_s** tmpFrame){....../*Kris, 170210, reduce fps to lower cpu usage. {*/#if 0 if(mPreviewFrameIndex++ < FILTER_FRAME_NUMBER)#else mPreviewFrameIndex++; if(mPreviewFrameIndex < FILTER_FRAME_NUMBER || mPreviewFrameIndex % 2 == 0)#endif/*Kris, 170210, reduce fps to lower cpu usage. }*/ { LOG2("%s:filter frame %d",__FUNCTION__,mPreviewFrameIndex); mCamDriverStreamLock.lock(); if(mCamDriverStream) ioctl(mCamFd, VIDIOC_QBUF, &cfilledbuffer1); mCamDriverStreamLock.unlock(); goto FILTER_FRAMES; }......}

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