rds-ctl: print RBDS call sign.

The PI code encodes a station's call sign for RBDS. Decode it and
print the call sign name.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>

diff --git a/utils/rds-ctl/rds-ctl.cpp b/utils/rds-ctl/rds-ctl.cpp
index 7745a8f..e4d2b5d 100644 (file)
--- a/utils/rds-ctl/rds-ctl.cpp
+++ b/utils/rds-ctl/rds-ctl.cpp
@@ -614,6 +614,37 @@ static void print_rds_eon(const struct v4l2_rds_eon_set *eon_set)
 
 static void print_rds_pi(const struct v4l2_rds *handle)
 {
+       uint16_t pi = handle->pi;
+
+       if (handle->is_rbds) {
+               char callsign[5] = { 0 };
+               uint8_t nibble = handle->pi >> 12;
+
+               if (pi >= 0xafa1 && pi <= 0xafa9)
+                       pi = (pi & 0xf) << 12;
+               else if (pi > 0xaf11 && pi <= 0xaf1f)
+                       pi = (pi & 0xff) << 8;
+               else if (pi > 0xaf21 && pi <= 0xafaf)
+                       pi = (pi & 0xff) << 8;
+
+               if (pi > 0xa100 && pi <= 0xa9ff)
+                       pi -= 0x9100;
+               if (pi > 0x1000 && pi <= 0x54a7) {
+                       pi -= 4096;
+                       callsign[0] = 'K';
+               } else if (pi >= 0x54a8 && pi <= 0x994f) {
+                       pi -= 21672;
+                       callsign[0] = 'W';
+               }
+               if (callsign[0]) {
+                       callsign[1] = 'A' + pi / 676;
+                       callsign[2] = 'A' + (pi / 26) % 26;
+                       callsign[3] = 'A' + pi % 26;
+                       printf("\nCall Sign: %s", callsign);
+               }
+               if (nibble != 0x0b && nibble != 0x0d && nibble != 0x0e)
+                       return;
+       }
        printf("\nArea Coverage: %s", v4l2_rds_get_coverage_str(handle));
 }