From 0c022aca03dc8f74f213accfefecb0fe6ad18fd0 Mon Sep 17 00:00:00 2001
From: Kamal Mostafa <kamal@whence.com>
Date: Thu, 30 Aug 2012 10:17:55 -0700
Subject: [PATCH] minimodem: --rx-one quits after first no-carrier

---
 src/minimodem.1.in |  3 +++
 src/minimodem.c    | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/src/minimodem.1.in b/src/minimodem.1.in
index b4936dc..37a34a0 100644
--- a/src/minimodem.1.in
+++ b/src/minimodem.1.in
@@ -104,6 +104,9 @@ Generate 32-bit floating-point format audio samples, instead of the
 default 16-bit signed integer format (applies to \-\-tx mode only;
 \-\-rx mode always uses 32-bit floating-point).
 .TP
+.B \-\-rx-one
+Quit after the first carrier/no-carrier event (applies to \-\-rx mode only).
+.TP
 .B \-\-benchmarks
 Run and report internal performance tests (all other flags are ignored).
 .TP
diff --git a/src/minimodem.c b/src/minimodem.c
index 6f6ead4..8af8468 100644
--- a/src/minimodem.c
+++ b/src/minimodem.c
@@ -341,6 +341,7 @@ usage()
     "		    -A, --alsa\n"
     "		    --lut={tx_sin_table_len}\n"
     "		    --float-samples\n"
+    "		    --rx-one\n"
     "		    --benchmarks\n"
     "		{baudmode}\n"
     "		    1200       Bell202  1200 bps --ascii\n"
@@ -389,6 +390,7 @@ main( int argc, char*argv[] )
     float tx_amplitude = 1.0;
     unsigned int tx_sin_table_len = 4096;
 
+    unsigned int rx_one = 0;
     float rxnoise_factor = 0.0;
 
     /* validate the default system audio mechanism */
@@ -412,6 +414,7 @@ main( int argc, char*argv[] )
 	MINIMODEM_OPT_UNUSED=256,	// placeholder
 	MINIMODEM_OPT_LUT,
 	MINIMODEM_OPT_FLOAT_SAMPLES,
+	MINIMODEM_OPT_RX_ONE,
 	MINIMODEM_OPT_BENCHMARKS,
 	MINIMODEM_OPT_XRXNOISE,
     };
@@ -441,6 +444,7 @@ main( int argc, char*argv[] )
 	    { "samplerate",	1, 0, 'R' },
 	    { "lut",		1, 0, MINIMODEM_OPT_LUT },
 	    { "float-samples",	0, 0, MINIMODEM_OPT_FLOAT_SAMPLES },
+	    { "rx-one",		0, 0, MINIMODEM_OPT_RX_ONE },
 	    { "benchmarks",	0, 0, MINIMODEM_OPT_BENCHMARKS },
 	    { "Xrxnoise",	1, 0, MINIMODEM_OPT_XRXNOISE },
 	    { 0 }
@@ -525,6 +529,9 @@ main( int argc, char*argv[] )
 	    case MINIMODEM_OPT_FLOAT_SAMPLES:
 			sample_format = SA_SAMPLE_FORMAT_FLOAT;
 			break;
+	    case MINIMODEM_OPT_RX_ONE:
+			rx_one = 1;
+			break;
 	    case MINIMODEM_OPT_BENCHMARKS:
 			benchmarks();
 			exit(0);
@@ -964,6 +971,9 @@ main( int argc, char*argv[] )
 		    nframes_decoded = 0;
 		    nbits_decoded = 0;
 		}
+
+		if ( rx_one )
+		    break;
 	    }
 
 	    /* Advance the sample stream forward by try_max_nsamples so the