70 lines
1.3 KiB
C
70 lines
1.3 KiB
C
#include "v4l2.h"
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int xioctl(int fd, int request, void *arg)
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{
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int retries = XIOCTL_RETRIES;
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int retval = -1;
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do {
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retval = ioctl(fd, request, arg);
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} while (
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retval
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&& retries--
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&& (
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errno == EINTR
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|| errno == EAGAIN
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|| errno == ETIMEDOUT
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)
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);
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// cppcheck-suppress knownConditionTrueFalse
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if (retval && retries <= 0) {
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E_LOG_PERROR(NULL, "ioctl(%d) retried %u times; giving up", request, XIOCTL_RETRIES);
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}
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return retval;
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}
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fourcc_string fourcc_to_string(unsigned format)
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{
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fourcc_string fourcc;
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char *ptr = fourcc.buf;
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*ptr++ = format & 0x7F;
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*ptr++ = (format >> 8) & 0x7F;
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*ptr++ = (format >> 16) & 0x7F;
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*ptr++ = (format >> 24) & 0x7F;
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if (format & ((unsigned)1 << 31)) {
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*ptr++ = '-';
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*ptr++ = 'B';
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*ptr++ = 'E';
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*ptr++ = '\0';
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} else {
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*ptr++ = '\0';
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}
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*ptr++ = 0;
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return fourcc;
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}
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static size_t align_size(size_t size, size_t to)
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{
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return ((size + (to - 1)) & ~(to - 1));
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}
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unsigned fourcc_to_stride(unsigned width, unsigned format)
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{
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switch (format) {
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case V4L2_PIX_FMT_YUYV:
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case V4L2_PIX_FMT_UYVY:
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case V4L2_PIX_FMT_RGB565:
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return align_size(width * 2, 32);
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case V4L2_PIX_FMT_RGB24:
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return align_size(width * 3, 32);
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case V4L2_PIX_FMT_SRGGB10P:
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return align_size(width * 5 / 4, 32);
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default:
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E_LOG_PERROR(NULL, "Unknown format: %s", fourcc_to_string(format));
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}
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}
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