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-rw-r--r--libtoolame-dab/utils.c33
1 files changed, 33 insertions, 0 deletions
diff --git a/libtoolame-dab/utils.c b/libtoolame-dab/utils.c
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+#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];
+
+}
+