Hi Nikko, The color conversion needs to be done before passing the frames through the callback(CAMERA_MSG_PREVIEW_FRAME) as the yuv420sp is the default color format supported by android application while accessing preview frames from application layer.
Have a look at lines from 209-215 in http://android.git.linaro.org/gitweb?p=hardware/linaro/common.git;a=blob;f=libcamera/CameraHardware.cpp;h=8c90fa4a591b2c0a43d0cbe42f656937785708ee;hb=1ad0e928edf6f046572b3f32eb5ee23d8d7f3f79 here is the camera hal which I have tested with skype,linphone,google hangouts kind of applications,you can look at it as reference. http://android.git.linaro.org/gitweb?p=hardware/linaro/common.git;a=summary Regards, Vishal On 2 May 2012 08:25, Nikko Torcita <nikkotorc...@gmail.com> wrote: > Hi all, > > I've been trying to support generic UVC cameras on android and have been > successful so far with getting the native camera app to display preview > images until I tested my code with skype video call and got stuck with a > buffer memory problem. To break it down, > > 1. I'm using the yuv422i-yuyv format since it's the only pixel format > supported by the uvc camera (Vimicro chipset) that i'm testing. I have also > set CameraService::Client::registerPreviewBuffers() to support > HAL_PIXEL_FORMAT_YCbCr_422_I in CameraService.cpp. > > 2. I set the size of my preview heap to 'PreviewHeap = width x height x 2' > since YUV422 takes up 4 bytes per 2 pixels. > > From logcat, I get this: > > D/CameraHardware(28343): PREVIEW SIZE: w=320 h=240 framerate=30 > E/CameraHardware(28343): virtual android::status_t > android::CameraHardware::startPreview() : > D/V4L2Camera(28343): USB Camera now streaming... > D/libEGL (28734): loaded /system/lib/egl/libGLES_android.so > D/libEGL (28734): loaded /vendor/lib/egl/libEGL_POWERVR_SGX540_120.so > D/libEGL (28734): loaded > /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX540_120.so > D/libEGL (28734): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX540_120.so > *E/Camera-JNI(28734): Manually set buffer was too small! Expected 153600 > bytes, but got 115201!* > *E/Camera-JNI(28734): Manually set buffer was too small! Expected 153600 > bytes, but got 115201!* > *E/Camera-JNI(28734): Manually set buffer was too small! Expected 153600 > bytes, but got 115201!* > W/com.skype.je(28734): not showing > > I traced it down to the camera jni and it seems like somewhere above the > HAL, a buffer was set to accommodate only up to 'width x height x 1.5'. > Hence, 320x240x1.5 = 115200 instead of 320x240x2 = 153600. Could it be that > the skype application only provided support for NV21 (YUV420) which takes > up 'width x height x 1.5' bytes of data? > > Thank you in advance. > > Nikko Torcita > > -- > unsubscribe: android-porting+unsubscr...@googlegroups.com > website: http://groups.google.com/group/android-porting > -- unsubscribe: android-porting+unsubscr...@googlegroups.com website: http://groups.google.com/group/android-porting
