Add -L option to print level

1 files changed, 33 insertions, 0 deletions

diff --git a/utils.c b/utils.c
new file mode 100644
index 0000000..a9aefbe
--- /dev/null
+++ b/utils.c
@@ -0,0 +1,33 @@
+#include "utils.h"
+#include <unistd.h>
+#include <stdint.h>
+#include <math.h>
+
+/* Taken from sox */
+const char* level(int channel, int* peak)
+{
+    static char const * const text[][2] = {
+        /* White: 2dB steps */
+        {"", ""}, {"-", "-"}, {"=", "="}, {"-=", "=-"},
+        {"==", "=="}, {"-==", "==-"}, {"===", "==="}, {"-===", "===-"},
+        {"====", "===="}, {"-====", "====-"}, {"=====", "====="},
+        {"-=====", "=====-"}, {"======", "======"},
+        /* Red: 1dB steps */
+        {"!=====", "=====!"},
+    };
+    int const red = 1, white = NUMOF(text) - red;
+
+    double linear = (double)(*peak) / INT16_MAX;
+
+    int vu_dB = linear ? floor(2 * white + red + linear_to_dB(linear)) : 0;
+
+    int index = vu_dB < 2 * white ?
+        MAX(vu_dB / 2, 0) :
+        MIN(vu_dB - white, red + white - 1);
+
+    *peak = 0;
+
+    return text[index][channel];
+
+}
+