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#include <stdio.h>
#include <stdint.h>
#include <stdlib.h>
#include <sys/types.h>
#include <unistd.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <assert.h>
#include <errno.h>
#include "xpad.h"
static int xpad_fd = 0;
/* The F-PAD has to be:
uint16_t fpad = 0x2; // CI flag
if (xpad_len()) {
fpad |= 1<<13; // variable length X-PAD
}
which is included by mot-encoder in the file/fifo
it generates
*/
/* Create and open the desired PAD input fifo
*/
int xpad_init(char* pad_fifo, int pad_len)
{
if (mkfifo(pad_fifo, S_IWUSR | S_IRUSR | S_IRGRP | S_IROTH) != 0) {
if (errno != EEXIST) {
fprintf(stderr, "Can't create pad file: %d!\n", errno);
return -1;
}
}
xpad_fd = open(pad_fifo, O_RDONLY | O_NONBLOCK);
if (xpad_fd == -1) {
fprintf(stderr, "Can't open pad file!\n");
return -1;
}
int flags = fcntl(xpad_fd, F_GETFL, 0);
if (fcntl(xpad_fd, F_SETFL, flags | O_NONBLOCK)) {
fprintf(stderr, "Can't set non-blocking mode in pad file!\n");
return -1;
}
return 0;
}
int xpad_read_len(uint8_t* buf, int len)
{
if (xpad_fd == 0) return 0;
ssize_t num_read = 0;
while (num_read < len) {
ssize_t r = read(xpad_fd, buf + num_read, len - num_read);
if(r < 0) {
if (errno == EAGAIN) {
return 0;
}
else {
perror("PAD input read error");
return -1;
}
}
else if (r == 0) {
// reached end of data
return 0;
}
num_read += r;
}
#if XPAD_DEBUG
int i;
for (i = 0; i < len; i++) {
fprintf(stderr, "%02x ", buf[i]);
}
fprintf(stderr, "\n");
#endif
return num_read;
}
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