Add audiowmark get --try-speed option for testing.

Signed-off-by: Stefan Westerfeld <stefan@space.twc.de>

src/audiowmark.cc

@@ -593,6 +593,15 @@ parse_get_options (ArgParser& ap)
     {
       Params::detect_speed = true;
     }
+  if (ap.parse_opt ("--try-speed", f))
+    {
+      if (Params::detect_speed)
+        {
+          error ("audiowmark: can not use both options: --detect-speed and --try-speed\n");
+          exit (1);
+        }
+      Params::try_speed = f;
+    }
   if (ap.parse_opt ("--test-speed", f))
     {
       Params::test_speed = f;

src/wmcommon.cc

@@ -26,6 +26,7 @@ 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
 bool   Params::detect_speed    = false;
+double Params::try_speed       = -1;
 double Params::test_speed      = -1;
 int    Params::have_key        = 0;
 size_t Params::payload_size    = 128;

src/wmcommon.hh

@@ -46,6 +46,7 @@ public:
   static           int  have_key;
 
   static           bool detect_speed;
+  static           double try_speed;               // manual speed correction
   static           double test_speed;              // for debugging --detect-speed
 
   static           size_t payload_size;            // number of payload bits for the watermark

src/wmget.cc

@@ -549,9 +549,13 @@ decode_and_report (const WavData& wav_data, const string& orig_pattern)
    * The reason to do it this way is that the detected speed may be wrong (on short clips)
    * and we don't want to loose a successful clip decoder match in this case.
    */
-  if (Params::detect_speed)
+  if (Params::detect_speed || Params::try_speed > 0)
     {
-      double speed = detect_speed (wav_data, !orig_pattern.empty());
+      double speed;
+      if (Params::detect_speed)
+        speed = detect_speed (wav_data, !orig_pattern.empty());
+      else
+        speed = Params::try_speed;
 
       // speeds closer to 1.0 than this usually work without stretching before decode
       if (speed < 0.9999 || speed > 1.0001)