This kind of discussion should be on android-platform or android-frameworks. You are way way way outside the bounds of the SDK. :)
On Wed, Feb 4, 2009 at 8:03 PM, Chris Clark <[email protected]> wrote: > I tried posting this question to the Android Internals mailing list, but > that list seems to be inactive... > > Goal: I am trying to gain access to raw camera data on the G1 from native > code (JNI C++) so that I can do real time image processing on camera frames > at 15 fps. This will not work in the Java API because it takes too long for > the camera preview callback to load the data. > > Setup: I am using the CodeSourcery C++ cross-compilation toolchain for ARM > development on Windows. I include the relevant header files from the Android > source code and create a shared library object using the following commands > (my project name is flow): > > arm-none-linux-gnueabi-g++ -I"C:\Program Files\Java\jdk1.6.0_11\include" > -I"C:\Program Files\Java\jdk1.6.0_11\include\linux" > -I"C:\Program > Files\Eclipse\SDK\android-sdk-windows-1.0_r2\source\core\include" > -I"C:\Program > Files\Eclipse\SDK\android-sdk-windows-1.0_r2\source\base\include" > -I"C:\Program Files\Eclipse\SDK\android-sdk-windows-1.0_r2\source\msm7k" > -I"C:\Program > Files\Eclipse\SDK\android-sdk-windows-1.0_r2\source\base\camera\libcameraservice" > -I"C:\Program > Files\Eclipse\SDK\android-sdk-windows-1.0_r2\source\common\include" > -fpic -c flow.c > > arm-none-linux-gnueabi-ld > --dynamic-linker /system/bin/linker -nostdlib -I /system/bin/linker > -rpath-link /system/lib > -L"C:\Program Files\CodeSourcery\Sourcery G++ > Lite\arm-none-linux-gnueabi\lib\ldscripts" -L. > -shared -o libflow.so flow.o > -z now @minlibs.inc > > where minlibs.inc contains: > -lcameraservice -lcamera -lui -lpixelflinger -lhardware -lgps -lcorecg > -lOmxH264Dec -lutils > -lqcamera -lwpa_client -lnetutils -lcutils -lrpc -llog -lz -lstdc++ -lm > -lc -ldl > > In order to link, I pulled copies of all the libraries in the /system/lib > folder on the device to my computer. Then I take this shared library object > and copy it to the resource directory of my Java Android project in Eclipse. > This Android activity uses System.load() to load my shared object and then I > call the functions in the shared object from Java by standard JNI. > > What works: I am able to run activities on the phone that call JNI > functions which contain calls to Android functions. For example, I was able > to write a message to the log and call android::CameraService::instantiate() > and see the log messages in the ddms debugger. > > Problem: The camera libraries that I would like to interface with are using > a template class sp. A function I want to use returns type: > android::sp<android::CameraHardwareInterface>. As soon as I declare a > variable of this type, the constructor and destructor are required. Despite > lengthy efforts, I have not been able to get a program to run that contains > this type declaration. The code builds and links fine on my computer, > without warnings, but the Activity crashes immediately upon execution and > the ddms debugger just says that my shared object is "not found" whenever > this type declaration is present. I do not know how to get any more detailed > debug messages from the dynamic linker. > > What I've tried: I made a batch file that scans through all the libraries > using arm-none-linux-gnueabi-nm -C -D to find the symbols needed to declare > this type. I believe that my minlibs.inc file contains all necessary > libraries, however I am not sure. The code for the constructor and > destructor of sp is directly in the header files that I have included and > the only functions they reference are incStrong and decStrong, which are > found in libutils.so, which I have linked to. I also sorted the relevant > libraries based on dependencies obtained using > arm-none-linux-gnueabi-objdump -p as can be seen in the minlibs.inc file > above. I also tried using an alternate constructor by passing in a null > pointer: > > android::QualcommCameraHardware *qcam = NULL; > android::sp<android::CameraHardwareInterface> cam(qcam); > //android::sp<android::CameraHardwareInterface> cam; > > My C++ function really only contains these lines, a call to > __android_log_write, and return. > > Question: Any ideas on how to get this to run without crashing? > > > > > -- Dianne Hackborn Android framework engineer [email protected] Note: please don't send private questions to me, as I don't have time to provide private support. All such questions should be posted on public forums, where I and others can see and answer them. --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
