resizing picture using IPU on IMX53

markusturban — Fri, 21 Jun 2013 16:03:25 GMT

Hello Community,

I want to resize a picture (twice: 1/2 and 1/4) which is captured by a camera using the IPU. I'm working on a Linuxkernel (freescale) and I'm using the IPU-HL Libs. (mxc_ipu_hl_lib.h)

The IPU does not resize, its cropping my picture when I'm doing following:

- captured image is grayscale

- size 1280 x 1024

Whats wrong with my code? Thank's for help :smileyhappy:

1) "Main-function" - in constructor of "ImageDisplay" [startIPU] is called

void ImageDisplay::setImage(void* buffer, int CamPitch)

{

cv::Mat m_lastImage;

//size of picture is 1280 x 1024

int x = 1280/2;

int y = 1024/2;

//copy captured picture to buffer

memcpy(buf[1],buffer,test_handle.input.width * test_handle.input.height);

updateIPU(&test_handle, x, y);

//saving image using OpenCV

m_lastImage = cv::Mat(y, x, CV_8UC1, buf[1], CamPitch);

cv::imwrite("img05.bmp", m_lastImage );

x/=2;

y/=2;

memcpy(buf[1],buffer,test_handle.input.width * test_handle.input.height);

updateIPU(&test_handle, x, y);

m_lastImage = cv::Mat(y, x, CV_8UC1, buf[1], CamPitch);

cv::imwrite("img025.bmp", m_lastImage );

}

2. Initialisation of IPU

int ImageDisplay::startIPU(ipu_test_handle_t * test_handle)

{

if ((fd_fb = open("/dev/fb0", O_RDWR, 0)) < 0)

{

printf("Unable to open /dev/fb0\n");

ret = -1;

}

if ( ioctl(fd_fb, FBIOGET_VSCREENINFO, &fb_var) < 0)

{

printf("Get FB var info failed!\n");

ret = -1;

}

if ( ioctl(fd_fb, FBIOGET_FSCREENINFO, &fb_fix) < 0)

{

printf("Get FB fix info failed!\n");

ret = -1;

}

if(fb_var.yres_virtual != 3*fb_var.yres)

{

fb_var.yres_virtual = 3*fb_var.yres;

if ( ioctl(fd_fb, FBIOPUT_VSCREENINFO, &fb_var) < 0)

{

printf("Get FB var info failed!\n");

ret = -1;

}

screen_size = fb_var.yres * fb_fix.line_length;

fb[0] = mmap(NULL, 3 * screen_size, PROT_READ | PROT_WRITE, MAP_SHARED,

fd_fb, 0);

if (fb[0] == MAP_FAILED)

{

printf("fb buf0 mmap failed, errno %d!\n", errno);

ret = -1;

}

fb[1] = (void *)((char *)fb[0]);

fb[0] = (void *)((char *)fb[1] + screen_size);

fb[2] = (void *)((char *)fb[1] + 2*screen_size);

/* use I420 input format as fix*/

test_handle->mode = OP_STREAM_MODE;

test_handle->input.width = 1280;

test_handle->input.height = 1024;

test_handle->input.fmt = v4l2_fourcc('I', '4', '2', '0');

if (fb_var.bits_per_pixel == 24)

test_handle->output.fmt = v4l2_fourcc('B', 'G', 'R', '3');

else

test_handle->output.fmt = v4l2_fourcc('R', 'G', 'B', 'P');

test_handle->output.width = fb_var.xres;

test_handle->output.height = fb_var.yres;

size = test_handle->input.width * test_handle->input.height * 3;

ret = dma_memory_alloc(size, BUF_CNT, paddr, buf);

if ( ret < 0) {

printf("dma_memory_alloc failed\n");

}

test_handle->input.user_def_paddr[0] = paddr[0];

test_handle->input.user_def_paddr[1] = paddr[1];

//init buffer (writing values)

gen_fill_pattern((char*)buf[0], test_handle->input.width, test_handle->input.height);

gen_fill_pattern((char*)buf[1], test_handle->input.width, test_handle->input.height);

ret = mxc_ipu_lib_task_init(&(test_handle->input), NULL, &(test_handle->output), test_handle->mode, test_handle->ipu_handle);

if (ret < 0)

{

printf("mxc_ipu_lib_task_init failed!\n");

}

return 0;

}

3.) Finally calling the update function

int ImageDisplay::updateIPU(ipu_test_handle_t * test_handle, int x, int y)

{

test_handle->output.width = x;

test_handle->output.height = y;

if(mxc_ipu_lib_task_buf_update(test_handle->ipu_handle, paddr[1], 0, 0, NULL, NULL) < 0)

return -1;

else

return 0;

}

Re: resizing picture using IPU on IMX53

BrilliantovKiri — Mon, 24 Jun 2013 09:53:38 GMT

Hello, Markus!

I solve this with Gstreamer mfw_ipu_csc plugin, please see attache.

I hope this helps.

Re: resizing picture using IPU on IMX53

markusturban — Mon, 24 Jun 2013 12:43:19 GMT

Hello Kirill,

thanks for your reply.

I'm not using v4linux. So I'm not sure if gstreamer(+plugin) is working for me. My cam-driver (closed source) is running as a service and is providing a void* field in memory by an API. I want to copy this field in DMA and IPU should resize it. The Camera is connected by USB.

In the .patch-file a file/folder "src/video/ipu_csc/src/mfw_gst_ipu_csc.c" is mentioned. I can't find this file in my toolchain directory...

Can you tell me where I can find "src/mfw_gst_ipu_csc.c". Maybe you can also post a little code-example....

Many thanks,

Markus

Re: resizing picture using IPU on IMX53

BrilliantovKiri — Mon, 24 Jun 2013 13:15:07 GMT

Hello, Markus!

You can find full source in gst-fsl-plugin-2.0.3/src/video/ipu_csc/src/mfw_gst_ipu_csc.c.

Re: resizing picture using IPU on IMX53

markusturban — Tue, 25 Jun 2013 11:05:37 GMT

Hello,

as I assumend its not working with gstreamer.

Can anybody provide a code-snippet for resizing pics with IPU and HL-Libs (mxc_ipu_hl_lib.c) ?

Thx,

Markus

Re: resizing picture using IPU on IMX53

rogerio_silva — Wed, 03 Jul 2013 19:41:26 GMT

Hi Markus,

I don't know if it helps, but you can take a look on this rotation code:

https://github.com/rogeriorps/ipu-examples/blob/master/mx5/rotation/example1/rot_ex1.c

Take off the rotation part (or run with rotation=0) and change the output size to the desired image size changing the following lines:

test_handle.output.width = fb_var.xres;

test_handle.output.height = fb_var.yres;

Rgds

Rogerio

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