Move remaining device methods

device/v4l2/v4l2.c

@@ -0,0 +1,59 @@
+#include "device/v4l2/v4l2.h"
+
+#include <linux/videodev2.h>
+#include <linux/v4l2-subdev.h>
+
+int xioctl(const char *name, int fd, int request, void *arg)
+{
+	int retries = XIOCTL_RETRIES;
+	int retval = -1;
+
+	do {
+		retval = ioctl(fd, request, arg);
+	} while (
+		retval
+		&& retries--
+		&& (
+			errno == EINTR
+			|| errno == EAGAIN
+			|| errno == ETIMEDOUT
+		)
+	);
+
+	// cppcheck-suppress knownConditionTrueFalse
+	if (retval && retries <= 0) {
+		E_LOG_PERROR(NULL, "%s: ioctl(%08x) retried %u times; giving up", name, request, XIOCTL_RETRIES);
+	}
+	return retval;
+}
+
+static size_t align_size(size_t size, size_t to)
+{
+	return ((size + (to - 1)) & ~(to - 1));
+}
+
+unsigned fourcc_to_stride(unsigned width, unsigned format)
+{
+	switch (format) {
+		case V4L2_PIX_FMT_YUYV:
+		case V4L2_PIX_FMT_UYVY:
+		case V4L2_PIX_FMT_RGB565:
+			return align_size(width * 2, 32);
+
+		case V4L2_PIX_FMT_YUV420:
+			return align_size(width * 3 / 2, 32);
+
+		case V4L2_PIX_FMT_RGB24:
+			return align_size(width * 3, 32);
+
+		case V4L2_PIX_FMT_SRGGB10P:
+			return align_size(width * 5 / 4, 32);
+
+		case V4L2_PIX_FMT_JPEG:
+		case V4L2_PIX_FMT_H264:
+			return 0;
+
+		default:
+			E_LOG_PERROR(NULL, "Unknown format: %s", fourcc_to_string(format).buf);
+	}
+}