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hw/v4l2.h

@@ -0,0 +1,47 @@
+#pragma once
+
+#include <stdlib.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <string.h>
+#include <math.h>
+#include <fcntl.h>
+#include <poll.h>
+#include <errno.h>
+#include <assert.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <pthread.h>
+
+#include <sys/ioctl.h>
+#include <sys/mman.h>
+
+#include <linux/videodev2.h>
+
+#ifndef CFG_XIOCTL_RETRIES
+#	define CFG_XIOCTL_RETRIES 4
+#endif
+#define XIOCTL_RETRIES ((unsigned)(CFG_XIOCTL_RETRIES))
+
+// assumes that name is first item
+#define dev_name(dev) (dev ? *(const char**)dev : "?")
+#define E_LOG_ERROR(dev, _msg, ...)		do { fprintf(stderr, "%s: " _msg "\n", dev_name(dev), ##__VA_ARGS__); goto error; } while(0)
+#define E_LOG_PERROR(dev, _msg, ...)		do { fprintf(stderr, "%s: " _msg "\n", dev_name(dev), ##__VA_ARGS__); exit(-1); } while(0)
+#define E_LOG_INFO(dev, _msg, ...)		fprintf(stderr, "%s: " _msg "\n", dev_name(dev), ##__VA_ARGS__)
+#define E_LOG_VERBOSE(dev, _msg, ...)	fprintf(stderr, "%s: " _msg "\n", dev_name(dev), ##__VA_ARGS__)
+#define E_LOG_DEBUG(dev, _msg, ...)		fprintf(stderr, "%s: " _msg "\n", dev_name(dev), ##__VA_ARGS__)
+
+typedef struct {
+	char buf[10];
+} fourcc_string;
+
+fourcc_string fourcc_to_string(unsigned format);
+unsigned fourcc_to_stride(unsigned width, unsigned format);
+int xioctl(const char *name, int fd, int request, void *arg);
+
+#define E_XIOCTL(dev, _fd, _request, _value, _msg, ...) do { \
+		int ret; \
+		if ((ret = xioctl(dev_name(dev), _fd, _request, _value)) < 0) { \
+			E_LOG_ERROR(dev, "xioctl(ret=%d): " _msg, ret, ##__VA_ARGS__); \
+		} \
+	} while(0)