8000 what is the possible reason of " Unable to initialize SurfaceComposerClient " ? · Issue #26 · openstf/minicap · GitHub
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what is the possible reason of " Unable to initialize SurfaceComposerClient " ? #26

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what is the possible reason of " Unable to initialize SurfaceComposerClient " ?#26

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@workzj
workzj
opened on Mar 23, 2016

my jni code :

android::spandroid::SurfaceComposerClient sc = new android::SurfaceComposerClient();

is failed .

i don't know why ??
look up the android source , i wirte the test code like this :

//test code
sp<ISurfaceComposer> sm(ComposerService::getComposerService());
if (sm != 0) {
    sp<ISurfaceComposerClient> conn = sm->createConnection();
    if (conn != 0) {
        LOG("init success ... ");
        return 1;
    }
    LOG("conn == 0");
    return -1;
}

the run result is : conn == 0 .
my question is why createConnection is failed ?
is authority ? is thread ?

i use the code in apk with JNI .

Activity

  1. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    Normal applications don't have permission to access SurfaceComposerClient. Only system apps can do it, or you can try rooting your device. Alternatively, if you're OK with supporting only Android 5.0+, try adding the CAPTURE_VIDEO_OUTPUT permission. I haven't tried it myself but it might work. Although if you're OK with 5.0+, you should use the official public APIs instead.

  2. sorccu
    closed this as completedon Mar 23, 2016

  3. workzj commented on Mar 23, 2016

    @workzj
    workzj
    on Mar 23, 2016
    Author

    but,my device is root . and i run app on android 4.4. is any other reason?

  4. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    Does your app run as root?

  5. workzj commented on Mar 23, 2016

    @workzj
    workzj
    on Mar 23, 2016
    Author

    yes, this is my test code:

    JNIEXPORT jint JNICALL Java_com_hupo_Screenshot(JNIEnv *jPE, jobject jo, jint jiX, jint jiY)
{
    int result = system("su");
    if (result == -1)
    {
        return -1;
    }

    ProcessState::self()->startThreadPool();

    ScreenshotClient mScreenshotClient;

    sp<android::CpuConsumer> mConsumer;
    sp<android::IBinder> mVirtualDisplay;
    CpuConsumer::LockedBuffer mBuffer;
    sp<FrameProxy> mFrameProxy;
    status_t err;

    DisplayInfo dinfo;
    /*
    sp<android::IBinder> dpy = SurfaceComposerClient::getBuiltInDisplay(DEFAULT_DISPLAY_ID);
    err = SurfaceComposerClient::getDisplayInfo(dpy, &dinfo);

    if (err != NO_ERROR) {
        LOGD("SurfaceComposerClient::getDisplayInfo() failed: %s (%d)\n", error_name(err), err);
        return err;
    }*/

    //test code
    sp<ISurfaceComposer> sm(ComposerService::getComposerService());
    if (sm != 0) {
        sp<ISurfaceComposerClient> conn = sm->createConnection();
        if (conn != 0) {
            LOG("init success ... ");
            return 1;
        }
        LOG("conn == 0");
        return -1;
    }

    return -1;
}

  6. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    That's not how su works... you only get root permissions inside su's child processes. Your code doesn't do anything.

  7. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    Also what does this have to do with minicap?

  8. workzj commented on Mar 23, 2016

    @workzj
    workzj
    on Mar 23, 2016
    Author

    this is my test code , because of my original code :
    // Create a Surface for the virtual display to write to.
    LOG("Creating SurfaceComposerClient");
    android::spandroid::SurfaceComposerClient sc = new android::SurfaceComposerClient();

    LOG("Performing SurfaceComposerClient init check");
if ((err = sc->initCheck()) != android::NO_ERROR) {
    LOGD("Unable to initialize SurfaceComposerClient failed: %s (%d)", error_name(err), err);
    return err;
}

    is " Unable to initialize SurfaceComposerClient ".so i write this test.

  9. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    I see. Well, you need to fix your su usage somehow, but if you get that fixed I think it will work.

  10. workzj commented on Mar 23, 2016

    @workzj
    workzj
    on Mar 23, 2016
    Author

    i don't understand ... you means , my app has not get the root authority ?

  11. sorccu commented on Mar 23, 2016

    @sorccu
    sorccu
    on Mar 23, 2016
    Member

    Yes, because that's not how su works.

  12. workzj commented on Mar 23, 2016

    @workzj
    workzj
    on Mar 23, 2016
    Author

    thank you ~! i try

  13. stoefln
    added a commit that references this issue on Nov 10, 2021

    Merge pull request openstf#26 from yusunan/master

    336f5aa
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