1 files changed, 124 insertions, 0 deletions
diff --git a/src/fdmdv_get_test_bits.c b/src/fdmdv_get_test_bits.c
new file mode 100644
index 0000000..111e173
--- /dev/null
+++ b/src/fdmdv_get_test_bits.c
@@ -0,0 +1,124 @@
+/*---------------------------------------------------------------------------*\
+
+  FILE........: fdmdv_get_test_bits.c
+  AUTHOR......: David Rowe
+  DATE CREATED: 1 May 2012
+
+  Generates a file of packed test bits, useful for input to fdmdv_mod.
+
+\*---------------------------------------------------------------------------*/
+
+
+/*
+  Copyright (C) 2012 David Rowe
+
+  All rights reserved.
+
+  This program is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License version 2.1, as
+  published by the Free Software Foundation.  This program is
+  distributed in the hope that it will be useful, but WITHOUT ANY
+  WARRANTY; without even the implied warranty of MERCHANTABILITY or
+  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+  License for more details.
+
+  You should have received a copy of the GNU Lesser General Public License
+  along with this program; if not, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <math.h>
+#include <errno.h>
+
+#include "codec2_fdmdv.h"
+
+int main(int argc, char *argv[])
+{
+    FILE         *fout;
+    struct FDMDV *fdmdv;
+    char          *packed_bits;
+    int           *tx_bits;
+    int           n, i, bit, byte;
+    int           numBits, nCodecFrames;
+    int           bits_per_fdmdv_frame;
+    int           bits_per_codec_frame;
+    int           bytes_per_codec_frame;
+    int           Nc;
+
+    if (argc < 3) {
+	printf("usage: %s OutputBitFile numBits [Nc]\n", argv[0]);
+	printf("e.g    %s test.c2 1400\n", argv[0]);
+	exit(1);
+    }
+
+    if (strcmp(argv[1], "-") == 0) fout = stdout;
+    else if ( (fout = fopen(argv[1],"wb")) == NULL ) {
+	fprintf(stderr, "Error opening output bit file: %s: %s.\n",
+         argv[1], strerror(errno));
+	exit(1);
+    }
+
+    numBits = atoi(argv[2]);
+
+    if (argc == 4) {
+        Nc = atoi(argv[3]);
+        if ((Nc < 2) || (Nc > FDMDV_NC_MAX) ) {
+            fprintf(stderr, "Error number of carriers must be btween 2 and %d\n",  FDMDV_NC_MAX);
+            exit(1);
+        }
+    }
+    else
+        Nc = FDMDV_NC;
+
+    fdmdv = fdmdv_create(Nc);
+
+    bits_per_fdmdv_frame = fdmdv_bits_per_frame(fdmdv);
+    bits_per_codec_frame = 2*fdmdv_bits_per_frame(fdmdv);
+    bytes_per_codec_frame = (bits_per_codec_frame+7)/8;
+    fprintf(stderr, "bits_per_fdmdv_frame: %d bits_per_codec_frame: %d bytes_per_codec_frame: %d\n",
+            bits_per_fdmdv_frame, bits_per_codec_frame, bytes_per_codec_frame);
+
+    packed_bits = (char*)malloc(bytes_per_codec_frame);
+    assert(packed_bits != NULL);
+    tx_bits = (int*)malloc(sizeof(int)*bits_per_codec_frame);
+    assert(tx_bits != NULL);
+
+    nCodecFrames = numBits/bits_per_codec_frame;
+
+    for(n=0; n<nCodecFrames; n++) {
+
+	fdmdv_get_test_bits(fdmdv, tx_bits);
+	fdmdv_get_test_bits(fdmdv, &tx_bits[bits_per_fdmdv_frame]);
+
+	/* pack bits, MSB received first  */
+
+	bit = 7; byte = 0;
+	memset(packed_bits, 0, bytes_per_codec_frame);
+	for(i=0; i<bits_per_codec_frame; i++) {
+	    packed_bits[byte] |= (tx_bits[i] << bit);
+	    bit--;
+	    if (bit < 0) {
+		bit = 7;
+		byte++;
+	    }
+	}
+
+	fwrite(packed_bits, sizeof(char), bytes_per_codec_frame, fout);
+
+	/* if this is in a pipeline, we probably don't want the usual
+	   buffering to occur */
+
+        if (fout == stdout) fflush(stdout);
+    }
+
+    free(tx_bits);
+    free(packed_bits);
+    fclose(fout);
+    fdmdv_destroy(fdmdv);
+
+    return 0;
+}
+