UM0851 datasheet(161/245 Pages) STMICROELECTRONICS

161 / 245 page

UM0851

Accelerator engine device drivers

Doc ID 16604 Rev 2

161/245

{

uint size = 0, count=0;

int wfd, status;

/* open jpeg nodes */

wfd = open("/dev/jpegwrite", O_RDWR|O_SYNC);

if (wfd == -1)

return -1;

/* set src image size */

ioctl(wfd, JPEGIOC_SET_SRC_IMG_SIZE, ssize);

/* set jpeg info for DWOH */

struct jpeg_dec_info dec_info;

ioctl(wfd, JPEGIOC_SET_DEC_INFO, dec_info);

/* set jpeg info for EWH, EWOH */

struct jpeg_enc_info enc_info;

ioctl(wfd, JPEGIOC_SET_ENC_INFO, enc_info);

wbuf[0] = (unsigned char *)mmap(0, 2*wsize, PROT_READ | PROT_WRITE, MAP_SHARED,

wfd, 0);

wbuf[1] = wbuf[0] + wsize;

while(count < ssize)

{

size = (ssize-count) < wsize?(ssize-count):wsize;

count += size;

shuffle_buf(cur_wbuf);

/* Add code here to copy size amount of data on wbuf[cur_wbuf] */

if((status = ioctl(wfd, JPEGIOC_START, rd)) != 0)

return -1;

}

munmap((char *)wbuf[0], 2*wsize);

close(wfd);

}

int main(void)

{

/* open jpeg nodes */

rfd = open("/dev/jpegread",O_RDWR|O_SYNC);

if (rfd == -1)

return -1;

rbuf[0] = (unsigned char *)mmap(0, 2*rsize, PROT_READ | PROT_WRITE, MAP_SHARED,

rfd, 0);

if (rbuf[0] == NULL)

return -1;

rbuf[1] = rbuf[0] + rsize;

pid = fork();

if (pid == 0)

// child

{

jpegwrite();

exit(0);

}

UM0851 Datasheet(PDF) 161 Page - STMicroelectronics

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