问题描述
我工作的一个库，使摄像机 API开发人员更容易消耗。
I am working on a library to make the Camera API easier for developers to consume.
在Droid难以置信2，在纵向模式下，使用后置摄像头，无法拍照。具体来说，我在LogCat中得到这个顺序：
The Droid Incredible 2, in portrait mode, using the rear-facing camera, fails to take a picture. Specifically, I get this sequence in LogCat:
08-18 09:25:52.094: E/QualcommCameraHardware(1368): native_get_picture: MSM_CAM_IOCTL_GET_PICTURE fd 25 error Connection timed out
08-18 09:25:52.094: E/QualcommCameraHardware(1368): getPicture failed!
08-18 09:25:52.094: E/QualcommCameraHardware(1368): get picture failed, giving jpeg callback with NULL data
这些消息出现〜5秒我打电话后， takePicture（）在摄像机，它适合与一些老来源$ C $ C我看到 QualcommCameraHardware ，设置了一个5000毫秒超时的的ioctl（）打电话说话摄像头硬件。
Those messages occur ~5 seconds after I call takePicture() on the Camera, which fits with some old source code I see for QualcommCameraHardware that sets up a 5000ms timeout on the ioctl() call to speak to the camera hardware.
最终的结果是， onPictureTaken（）传递一个空 字节[] 的JPEG数据，这意味着我们没有任何照片。
The net result is that onPictureTaken() is passed a null byte[] of JPEG data, meaning we have no photo.
本设备可与我的code在所有其他测试的配置，其中包括在纵向模式下工作的前置摄像头。
The device works with my code in all other tested configurations, including working in portrait mode with the front-facing camera.
有谁知道一些具体的，可能会导致这个特别的失败？
Does anyone know of something specific that might cause this particular failure?
更新
我无法再重现的错误。我想删除的问题，但是这显然是不可能的，一旦有答案。
I can no longer reproduce the error. I would delete the question, but that apparently is not possible once there are answers.
推荐答案
MSM_CAM_IOCTL_GET_PICTURE是运行功能的内核调用
MSM_CAM_IOCTL_GET_PICTURE is a kernel call which runs the function
static int msm_get_pic(struct msm_sync *sync, void __user *arg)
我下载的内核源从HTCdev您的设备，发现中定义的函数
I downloaded the kernel source for your device from the HTCdev and found the function defined in
drivers/media/video/msm/msm_camera-7x30.c
可以核对一下，当你拍照什么的内核消息？
Could check what are the kernel messages when you take a picture?
adb shell su -c "dmesg"
这篇关于来源QualcommCameraHardware native_get_picture的想法：MSM_CAM_IOCTL_GET_PICTURE连接超时错误？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！