SRC: audiowmark.cc, wmcommon: add --json option and Params::json_output flag

Signed-off-by: Tim Janik <timj@gnu.org>

src/audiowmark.cc

@@ -58,6 +58,7 @@ print_usage()
   printf ("\n");
   printf ("Global options:\n");
   printf ("  --strength <s>        set watermark strength              [%.6g]\n", Params::water_delta * 1000);
+  printf ("  --json                produce JSON output\n");
   printf ("  --linear              disable non-linear bit storage\n");
   printf ("  --short <bits>        enable short payload mode\n");
   printf ("  --key <file>          load watermarking key from file\n");
@@ -456,6 +457,10 @@ parse_shared_options (ArgParser& ap)
     {
       Params::water_delta = f / 1000;
     }
+  if (ap.parse_opt ("--json"))
+    {
+      Params::json_output = true;
+    }
   if (ap.parse_opt  ("--key", s))
     {
       Params::have_key++;

src/wmcommon.cc

@@ -22,6 +22,7 @@
 
 int    Params::frames_per_bit  = 2;
 double Params::water_delta     = 0.01;
+bool   Params::json_output     = false;
 bool   Params::mix             = true;
 bool   Params::hard            = false; // hard decode bits? (soft decoding is better)
 bool   Params::snr             = false; // compute/show snr while adding watermark

src/wmcommon.hh

@@ -40,6 +40,7 @@ public:
   static constexpr int min_band          = 20;
 
   static           double water_delta;
+  static           bool json_output;
   static           bool mix;
   static           bool hard;                      // hard decode bits? (soft decoding is better)
   static           bool snr;                       // compute/show snr while adding watermark