Tegra_multimedia_api (NvJPEGEncoder::encodeFromBuffer) segmentation fault

Autonomous Machines Jetson & Embedded Systems Jetson TX1
1

Dear Everyone,

I am working with Jetson Tx1 and Jetpack version 2.3.1. I use Tegra_multimedia_api to encode YUV420 to jpeg , but sometimes I get the segmentation fault. It does not happen all the times, so I don’t know what is the problem. I don’t know how to attach the screenshot, so I would like to make some description as below.segmentation fault at jpeg_write_raw_data() due to memcpy().

int
NvJPEGEncoder::encodeFromBuffer(NvBuffer & buffer, J_COLOR_SPACE color_space,
        unsigned char **out_buf, unsigned long &out_buf_size)
{
	.........
	
    for (i = 0; i < height; i += v_max_samp * DCTSIZE)
    {
        for (k = 0; k < channels; k++)
        {
            for (j = 0; j < v_samp[k] * DCTSIZE; j++)
            {
                line[k][j] = base[k];
                if (base[k] + stride[k] < end[k])
                    base[k] += stride[k];
            }
        }
        jpeg_write_raw_data(&cinfo, line, v_max_samp * DCTSIZE);//>>> segmentation fault in this line of code due to memcpy()
    }

	.........
	
    return 0;
}

when I print out the debug information like this:

printf("encodeFromBuffer out_buf_size:%d, width:%d, height:%d, v_max_samp:%d, cinfo.width:%d, cinfo.height:%d\n", out_buf_size, width, height, v_max_samp, cinfo.image_width, cinfo.image_height);
    int v = 0;
    for (i = 0; i < height; i += v_max_samp * DCTSIZE)
    {
        for (k = 0; k < channels; k++)
        {
            for (j = 0; j < v_samp[k] * DCTSIZE; j++)
            {
                line[k][j] = base[k];
                if (base[k] + stride[k] < end[k])
                    base[k] += stride[k];
            }
        }

        printf("channels:%d, i:%d, k:%d, j:%d, v:%d, line:%08X, cinfo->comp_info[0].v_samp_factor:%d\n", channels,i, k, j, v,line, cinfo.comp_info[0].v_samp_factor);
        v += jpeg_write_raw_data(&cinfo, line, v_max_samp * DCTSIZE);
        if (cinfo.err->msg_code)
        {
        	printf("jpeg_write_raw_data error code :%d\n", cinfo.err->msg_code);
        }
    }

I got:
…
channels:3, i:832, k:3, j:8, v:832, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:848, k:3, j:8, v:848, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:864, k:3, j:8, v:864, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:880, k:3, j:8, v:880, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:896, k:3, j:8, v:896, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:912, k:3, j:8, v:912, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:928, k:3, j:8, v:928, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:944, k:3, j:8, v:944, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:960, k:3, j:8, v:960, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:976, k:3, j:8, v:976, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:992, k:3, j:8, v:992, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:1008, k:3, j:8, v:1008, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:1024, k:3, j:8, v:1024, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:1040, k:3, j:8, v:1040, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:1056, k:3, j:8, v:1056, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
channels:3, i:1072, k:3, j:8, v:1072, line:6D870610, cinfo->comp_info[0].v_samp_factor:2
Segmentation fault

Image resolution is FullHD(1920x1080).
Maybe this topic is relevant, but I am not sure, could you confirm whether it is the jetpack api issue?
https://devtalk.nvidia.com/default/topic/1005580/nvjpegenc-segmentation-fault/?offset=7

Thanks for supporting.

2

More debug information:

Crash 1st:
line unsigned char **[3] 0x7f667fe350
line[0] unsigned char ** 0x7f54003260
line[1] unsigned char ** 0x7f54003020
line[2] unsigned char ** 0x7f540749e0
Caught segfault at address 0x7f54390000

Crash 2nd:
line unsigned char **[3] 0x7f667fe350
line[0] unsigned char ** 0x7f4c002070
line[1] unsigned char ** 0x7f4c002520
line[2] unsigned char ** 0x7f4c001f00
Caught segfault at address 0x7f4c390000

I am looking forward to any suggestion or information.
Thanks.

3

Dear Nvidia Tx1 moderator,

Could you give me any information for my issue ?

Thanks

4

Long65rzy,
Sorry for late,
Could you share your sample code?
So I can reproduce on my side.

Thanks
wayne zhu

5

Dear waynezhu,

I cannot share the whole code, but I am using tegra api as below:

class CEncodeYc2Jpeg {
public:
	CEncodeYc2Jpeg();
	virtual ~CEncodeYc2Jpeg();
	uint32_t encodeYc2Jpeg(char* buffer_in, uint8_t* buffer_out, uint32_t width, uint32_t height);
protected:
	int		encodeYc2Jpeg( unsigned char **output, uint32_t width, uint32_t height, uint32_t &outputSize );
	int		initYc2Jpeg( uint32_t width, uint32_t height );
	int		reinitYc2Jpeg( uint32_t width, uint32_t height  );
private:
	/**
	 * Tegra buffer for yuv420
	 */
	NvBuffer *m_nvbuffer;
	NvJPEGEncoder *m_gJpegenc;

	/**
	 * Jpeg resolution
	 */
	uint32_t m_width;
	uint32_t m_height;
};

CEncodeYc2Jpeg::CEncodeYc2Jpeg():
	 m_nvbuffer(NULL)
	,m_gJpegenc(NULL)
	,m_width(1920)
	,m_height(1080)
{
	int nInit = -1;
	m_gJpegenc = NvJPEGEncoder::createJPEGEncoder("jpenenc");
	if (m_gJpegenc != nullptr) {
		nInit = initYc2Jpeg( 1920, 1080);
		if(nInit == -1){
			printf("CEncodeYc2Jpeg Init fails\n");
		}else{
			printf("CEncodeYc2Jpeg Init frame size width = %d height = %d\n", m_width, m_height);
		}
	}else{
		printf("createJPEGEncoder fail !\n");
	}
}

CEncodeYc2Jpeg::~CEncodeYc2Jpeg() {
	delete m_nvbuffer;
	m_nvbuffer = nullptr;
	delete m_gJpegenc;
	m_gJpegenc = nullptr;
}

int CEncodeYc2Jpeg::initYc2Jpeg( uint32_t width, uint32_t height  )
{
	m_gJpegenc->setCropRect(0, 0, width, height);
	m_nvbuffer = new NvBuffer(V4L2_PIX_FMT_YUV420M, width, height, 0);
	if( m_nvbuffer->allocateMemory() != 0){
		printf("CEncodeYc2Jpeg NvBuffer allocateMemory fail !\n");
		return -1;
	}
	//printf("m_nvbuffer memory address of plane[1] %LX plane[2] %LX plane[3] %LX\n",
			//m_nvbuffer->planes[0], m_nvbuffer->planes[2], m_nvbuffer->planes[3]);
	return 0;
}

int CEncodeYc2Jpeg::reinitYc2Jpeg( uint32_t width, uint32_t height  )
{
	int ret = 0;
	delete m_nvbuffer;
	m_nvbuffer = nullptr;
	ret = initYc2Jpeg(width, height);
	return ret;
}

/*
 * convert Yc to Jpeg
 * */
int CEncodeYc2Jpeg::encodeYc2Jpeg( unsigned char **output, uint32_t width, uint32_t height, uint32_t &outputSize )
{
	int ret = 0;

	if (output != nullptr && *output != nullptr) {
		unsigned long outputSizeTmp = width * height * 3 / 2;
		ret = m_gJpegenc->encodeFromBuffer( *m_nvbuffer, JCS_YCbCr, output, outputSizeTmp);
		outputSize = outputSizeTmp & 0xffffffff;
	}
	return ret;
}

uint32_t CEncodeYc2Jpeg::encodeYc2Jpeg(char* buffer_in, uint8_t* buffer_out, uint32_t width, uint32_t height)
{
	int read_video_frame(char * ycraw, NvBuffer & buffer);
	uint32_t outputSize = 0;

	//reinitialize in case of size change
	if( m_width != width || m_height != height){
		if ( reinitYc2Jpeg(width, height) != 0 ){
			return outputSize;
		}
		m_width = width;
		m_height = height;
		printf("CEncodeYc2Jpeg update frame size width = %d height = %d\n", m_width, m_height);
	}

	read_video_frame(buffer_in,*m_nvbuffer);
	encodeYc2Jpeg(&buffer_out, width, height, outputSize);
	return outputSize;
}

encodeYc2Jpeg(char* buffer_in, uint8_t* buffer_out, uint32_t width, uint32_t height) is used to encode yuv420 to jpeg from memory buffer.

It is successful most of the time, but sometimes it gets segmentation fault at Tegra_multimedia_api as my above description.

I would like to confirm more information that if Nvjpegenc segmentation fault - Jetson TX1 - NVIDIA Developer Forums is similar. And whether libnvjpeg has any problem ?.
Because I am not using the latest Jetpack. My using version is 2.3.1.

If possible please tell me how to attach an image file for more detail, because I cannot share the whole source.

6

I think yes, fix is already on rel28.1

7

wayne zhu,
Sorry, but my product is in production process, and Jetpack cannot be updated at this time.
Is there any work around for this issue ?

8

wayne zhu,
Sorry, but my product is in production process, and Jetpack cannot be updated at this time.
Is there any work around for this issue ?

9

I will send you a so for fix.
libnvjpeg.7z (110 KB)

10

Thanks for your support.