MmalVideoCamera::MmalVideoCamera(int imageWidth, int imageHeight, int frameRate) :
m_imageWidth(imageWidth),
m_imageHeight(imageHeight),
m_frameRate(frameRate),
m_imagePreviewWidth(VCOS_ALIGN_UP(imageWidth, 32)),
m_imagePreviewHeight(VCOS_ALIGN_UP(imageHeight, 16)),
m_callbackData(NULL),
m_cs(),
m_camera(NULL),
m_pool(NULL),
m_videoPort(NULL),
m_stillPort(NULL),
m_previewPort(NULL),
m_videoPortEnabled(false)
{
std::cout << "Creating callback data..." << std::endl;
m_callbackData = new MmalVideoCallbackData(m_imageWidth, m_imageHeight, 3);
std::cout << "Creating camera..." << std::endl;
createCameraComponent();
std::cout << "Created camera" << std::endl;
std::cout << "Target Image Width: " << m_imageWidth << std::endl;
std::cout << "Target Image Height: " << m_imageHeight << std::endl;
createBufferPool();
std::cout << "Initialized camera" << std::endl;
}
/**
* Start the streaming of buffers in a video device
*
* This called is allowed in the following states:
* - CONFIGURED
* - PREPARED
*
* If the current state is PREPARED then we create the active
* buffer pool and we activate it.
* In case we are in state POPULATED we only need to re-activate it (i.e. enqueu
* again the buffers to the device)
*
* Finally call the stream on IOCTL
*
* \param buffer_count size of the active buffer pool
* \param initial_skips number of frames that will be marked as corrupted when
* we start grabbing frames from the device.
*
*/
int V4L2VideoNode::start(int buffer_count, int initial_skips)
{
LOG1("@%s, device = %s", __FUNCTION__, mName.string());
int ret(0);
if ((mState != DEVICE_POPULATED) &&
(mState != DEVICE_PREPARED)) {
ALOGE("%s: Invalid state to start %d", __FUNCTION__, mState);
return -1;
}
if (mBufferPool.isEmpty()) {
ret = createBufferPool(buffer_count);
if (ret < 0) {
destroyBufferPool();
return ret;
}
}
//Qbuf
ret = activateBufferPool();
if (ret < 0)
return ret;
//stream on
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
ret = ioctl(mFd, VIDIOC_STREAMON, &type);
if (ret < 0) {
ALOGE("VIDIOC_STREAMON returned: %d (%s)", ret, strerror(errno));
return ret;
}
mFrameCounter = 0;
mState = DEVICE_STARTED;
mInitialSkips = initial_skips;
PERFORMANCE_TRACES_BREAKDOWN_STEP_PARAM("DeviceId:", mDeviceId);
return ret;
}
