Rudimentary streaming of raw MIDI over multicast UDP

1 files changed, 111 insertions, 0 deletions

diff --git a/midimcast.h b/midimcast.h
new file mode 100644
index 0000000..26cab34
--- /dev/null
+++ b/midimcast.h
@@ -0,0 +1,111 @@
+#ifndef __MIDIMCAST_H__
+#define __MIDIMCAST_H__
+
+#include <errno.h>
+#include <stdbool.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#define debug(FMT, ...)					\
+	if (midimcast_debug) {				\
+		fprintf(stderr,				\
+			"[DEBUG] %s:%u:%s: " FMT "\n",	\
+			__FILE__,			\
+			__LINE__,			\
+			__func__ __VA_OPT__(,)		\
+			__VA_ARGS__);			\
+	}
+
+#define warn(FMT, ...)						\
+	fprintf(stderr, "[WARNING] %s:%u:%s: " FMT "\n",	\
+		__FILE__,					\
+		__LINE__,					\
+		__func__ __VA_OPT__(,)				\
+		__VA_ARGS__);
+
+#define err(FMT, ...)						\
+	({							\
+		fprintf(stderr, "[ERROR] %s:%u:%s: " FMT "\n",	\
+			__FILE__,				\
+			__LINE__,				\
+			__func__ __VA_OPT__(,)			\
+			__VA_ARGS__);				\
+		exit(EXIT_FAILURE);				\
+	})
+
+#define err_std_nchk(CALLEE)					\
+	({							\
+		fprintf(stderr, "[ERROR] %s:%u:%s:%s: %s\n",	\
+			__FILE__,				\
+			__LINE__,				\
+			__func__,				\
+			#CALLEE,				\
+			strerror(errno));			\
+		exit(EXIT_FAILURE);				\
+	})
+
+#define err_std(CALLEE, ...)			\
+	if (CALLEE(__VA_ARGS__))		\
+		err_std_nchk(CALLEE);
+
+#define err_std_neg(CALLEE, ...)			\
+	({						\
+		const typeof(CALLEE(__VA_ARGS__)) ret =	\
+			CALLEE(__VA_ARGS__);		\
+		if (ret < 0)				\
+			err_std_nchk(CALLEE);		\
+		ret;					\
+	})
+
+#define err_std_null(CALLEE, ...)			\
+	({						\
+		const typeof(CALLEE(__VA_ARGS__)) ret =	\
+			CALLEE(__VA_ARGS__);		\
+		if (!ret)				\
+			err_std_nchk(CALLEE);		\
+		ret;					\
+	})
+
+#define err_snd_nchk(CALLEE, ERR)				\
+	({							\
+		fprintf(stderr, "[ERROR] %s:%u:%s:%s: %s\n",	\
+			__FILE__,				\
+			__LINE__,				\
+			__func__,				\
+			#CALLEE,				\
+			snd_strerror(ERR));			\
+		exit(EXIT_FAILURE);				\
+	})
+
+
+#define err_snd(CALLEE, ...)				\
+	({						\
+		const int err = CALLEE(__VA_ARGS__);	\
+		if (err)				\
+			err_snd_nchk(CALLEE, err);	\
+	})
+
+#define err_snd_neg(CALLEE, ...)			\
+	({						\
+		const typeof(CALLEE(__VA_ARGS__)) ret	\
+			= CALLEE(__VA_ARGS__);		\
+		if (ret < 0)				\
+			err_snd_nchk(CALLEE, ret);	\
+		ret;					\
+	})
+
+struct msg {
+	uint64_t ts;
+	uint8_t midi[0x10]; // Large enough buffer
+} __attribute__((packed));
+
+extern uint64_t now();
+
+extern bool midimcast_debug;
+
+void env_read_common(const char **const mcast_group,
+		     uint16_t *const mcast_port);
+
+#endif