android JB2连拍降速原理介绍

1、HAL层

(1)alps\mediatek\platform\mt6589\hardware\camera\core\camshot\MultiShot\MultiShot.cpp sleep实现降速。

在sendCommand处理ECamShot_CMD_SET_CSHOT_SPEED。ECamShot_CMD_SET_CSHOT_SPEED定义在alps\mediatek\platform\mt6589\hardware\camera\inc\camshot\_params.h.

MBOOL

MultiShot::

sendCommand(MINT32 cmd, MINT32 arg1, MINT32 arg2, MINT32 arg3)

{

    FUNCTION_LOG_START;

 

    MBOOL ret = MTRUE;

    //

    switch  (cmd)

    {

    case ECamShot_CMD_SET_CSHOT_SPEED:

        if(arg1 > 0)

        {

            mu4ShotSpeed = arg1;

            ret = MTRUE;

        }

        else

        {

            MY_LOGD("set invalid shot speed: %d", arg1);

            ret = MFALSE;

        }

        break;

    default:

        break;

    }

    //

 

    FUNCTION_LOG_END;

    //

    return ret;

}

 

(2)发送ECamShot_CMD_SET_CSHOT_SPEED的函数,在alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\scenario\shot\continuousshot\ContinuousShot.cpp,

bool

ContinuousShot::

onCmd_setCShotSpeed(uint32_t u4CShotSpeed)

{

    bool ret = true;

 

    Mutex::Autolock lock(mShotStopMtx);

    if(!mbShotStoped && mpMultiShot!=NULL)

    {

        MY_LOGD("set continuous shot speed: %d", u4CShotSpeed);

        ret = mpMultiShot->sendCommand(NSCamShot::ECamShot_CMD_SET_CSHOT_SPEED, u4CShotSpeed, 0, 0);

    }

 

    return ret;

}

同一时候在该文件的sendCommand函数处理adapter传下的eCmd_setCShotSpeed。eCmd_setCShotSpeed定义在alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\inc\scenario\shot\IShot.h

    case eCmd_setCShotSpeed:

        ret = onCmd_setCShotSpeed(arg1);

        break;

 

(3)Adapter在下面文件的函数setCShotSpeed发送eCmd_setCShotSpeed。

MtkPhotoCamAdapter.Capture.cpp (alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\mtkphoto):

MtkZsdNccCamAdapter.Capture.cpp (alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\mtkzsd\mtkzsdncc):

status_t

CamAdapter::

setCShotSpeed(int32_t i4CShotSpeeed)

{

    if(i4CShotSpeeed <= 0)

    {

        MY_LOGE("can not set continuous shot speed as %d fps)", i4CShotSpeeed);

        return BAD_VALUE;

    }

   

    sp<IShot> pShot = mpShot;

    if  ( pShot != 0 )

    {

        pShot->sendCommand(eCmd_setCShotSpeed, i4CShotSpeeed, 0);

    }

   

    return OK;

}

 

在下面文件sendCommad函数处理JNI送下来的CAMERA_CMD_SET_CSHOT_SPEED。

MtkCamera.h (alps\mediatek\frameworks-ext\av\include\camera):   

CAMERA_CMD_SET_CSHOT_SPEED,

 

MtkPhotoCamAdapter.cpp (alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\mtkphoto): 

MtkZsdCcCamAdapter.cpp (alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\mtkzsd\mtkzsdcc):

MtkZsdNccCamAdapter.cpp (alps\mediatek\platform\mt6589\hardware\camera\hal\adapter\mtkzsd\mtkzsdncc): 

    case CAMERA_CMD_SET_CSHOT_SPEED:

        return setCShotSpeed(arg1);

                  

2、JNI层

(1)android_hardware_Camera.cpp (alps\frameworks\base\core\jni):

static void android_hardware_Camera_setContinuousShotSpeed(JNIEnv *env, jobject thiz, jint value)

(2)

static JNINativeMethod camMethods[] = {

...

  { "setContinuousShotSpeed",

    "(I)V",

    (void *)android_hardware_Camera_setContinuousShotSpeed },

(3)Camera.java (alps\frameworks\base\core\java\android\hardware):  

 public native void setContinuousShotSpeed(int speed);