Add initial copy-pasted code

1 files changed, 53 insertions, 0 deletions

diff --git a/src/utils.h b/src/utils.h
new file mode 100644
index 0000000..83b3e4d
--- /dev/null
+++ b/src/utils.h
@@ -0,0 +1,53 @@
+#ifndef UTILS_H_
+#define UTILS_H_
+
+#include <math.h>
+#include <stdint.h>
+#include <stddef.h>
+
+#define MIN(a,b) (((a)<(b))?(a):(b))
+#define MAX(a,b) (((a)>(b))?(a):(b))
+
+#define NUMOF(l) (sizeof(l) / sizeof(*l))
+
+#define linear_to_dB(x) (log10(x) * 20)
+
+/*! Calculate the little string containing a bargraph
+ * 'VU-meter' from the peak value measured
+ */
+const char* level(int channel, int peak);
+
+/*! This defines the on-wire representation of a ZMQ message header.
+ * It must be compatible with the definition in ODR-DabMux.
+ *
+ * The data follows right after this header */
+struct zmq_frame_header_t
+{
+    uint16_t version; // we support version=1 now
+    uint16_t encoder; // see ZMQ_ENCODER_XYZ
+
+    /* length of the 'data' field */
+    uint32_t datasize;
+
+    /* Audio level, peak, linear PCM */
+    int16_t audiolevel_left;
+    int16_t audiolevel_right;
+
+    /* Data follows this header */
+} __attribute__ ((packed));
+
+#define ZMQ_ENCODER_FDK 1
+#define ZMQ_ENCODER_TOOLAME 2
+
+#define ZMQ_HEADER_SIZE sizeof(struct zmq_frame_header_t)
+
+/* The expected frame size incl data of the given frame */
+#define ZMQ_FRAME_SIZE(f) (sizeof(struct zmq_frame_header_t) + f->datasize)
+
+#define ZMQ_FRAME_DATA(f) ( ((uint8_t*)f)+sizeof(struct zmq_frame_header_t) )
+
+
+size_t strlen_utf8(const char *s);
+
+#endif
+