Added plain_interpolate_cc

csdr.c

@@ -143,7 +143,11 @@ char usage[]=
 "    gaussian_noise_c\n"
 "    awgn_cc <snr_db> [--snrshow]\n"
 "    pack_bits_8to1_u8_u8\n"
+"    firdes_matched_filter_f (RRC <samples_per_symbol> <num_taps> <beta> | COSINE <samples_per_symbol>)\n"
+"    matched_filter_cc (RRC <samples_per_symbol> <num_taps> <beta> | COSINE <samples_per_symbol>)\n"
 "    add_n_zero_samples_at_beginning_f <n_zero_samples>\n"
+"    generic_slicer_f_u8 <n_symbols>\n"
+"    plain_interpolate_cc <n_symbols>\n"
 "    ?<search_the_function_list>\n"
 "    =<evaluate_python_expression>\n"
 "    \n"
@@ -3106,6 +3110,24 @@ int main(int argc, char *argv[])
         return 0;
     }
 
+    if(!strcmp(argv[1], "plain_interpolate_cc")) //<interpolation>
+    {
+        int interpolation = 0;
+        if(argc<=2) return badsyntax("required parameter <interpolation> is missing.");
+        sscanf(argv[2],"%d",&interpolation);
+        if(!sendbufsize(interpolation*initialize_buffers())) return -2;
+        complexf* plainint_output_buffer = (complexf*)malloc(sizeof(complexf)*the_bufsize*interpolation);
+        for(;;)
+        {
+            FEOF_CHECK;
+            FREAD_C;
+            plain_interpolate_cc((complexf*)input_buffer, plainint_output_buffer, the_bufsize, interpolation);
+            fwrite(plainint_output_buffer, sizeof(float)*2, the_bufsize*interpolation, stdout);
+            TRY_YIELD;
+        }
+        return 0;
+    }
+
     if(!strcmp(argv[1],"none"))
     {
         return 0;

libcsdr.c

@@ -2383,6 +2383,15 @@ int firdes_rrc_f(float* taps, int taps_length, int samples_per_symbol, float bet
     }
 }
 
+void plain_interpolate_cc(complexf* input, complexf* output, int input_size, int interpolation)
+{
+    for(int i=0;i<input_size;i++)
+    {
+        output[i*interpolation]=input[i];
+        bzero(output+(interpolation*i)+1, (interpolation-1)*sizeof(complexf));
+    }
+}
+
 #define MMATCHEDFILT_GAS(NAME) \
     if(!strcmp( #NAME , input )) return MATCHED_FILTER_ ## NAME;
 
@@ -2408,3 +2417,4 @@ int trivial_vectorize()
     }
     return c[0];
 }
+void plain_interpolate_cc(complexf* input, complexf* output, int input_size, int interpolation);

libcsdr.h

@@ -384,3 +384,4 @@ int firdes_rrc_f(float* taps, int taps_length, int samples_per_symbol, float bet
 matched_filter_type_t matched_filter_get_type_from_string(char* input);
 int apply_real_fir_cc(complexf* input, complexf* output, int input_size, float* taps, int taps_length);
 void generic_slicer_f_u8(float* input, unsigned char* output, int input_size, int n_symbols);
+void plain_interpolate_cc(complexf* input, complexf* output, int input_size, int interpolation);;