Added some output buf reset code

1 files changed, 39 insertions, 1 deletions

diff --git a/WasmAudio/main.c b/WasmAudio/main.c
index ab17933..5c9628a 100644
--- a/WasmAudio/main.c
+++ b/WasmAudio/main.c
@@ -87,7 +87,7 @@ firw_t firw_lp;
 //const int N=200;
 #define N (200)
 double h[N],w[N];
-int filter_N=60;
+int filter_N=180;
 int filter_FS_hz=48000;
 int filter_FC_hz=1000;
 double filter_FC;
@@ -105,6 +105,8 @@ void audio_playback_callback(void *data, uint8_t *outsamples, int len) {
     if (audio_buf_position<audio_rec_buffer_size) {
         memcpy( outsamples, audio_rec_buffer+audio_buf_position,len);
         audio_buf_position += len;
+    } else {
+        memset( outsamples, 0, len*sizeof(double));
     }
     
 }
@@ -346,6 +348,42 @@ void fir_filter(fir_t *fir, double *input, uint32_t ilength, double *output, uin
         memmove(&input[0], &input[ilength], (fir->num_taps-1)*sizeof(double));
 }
 
+#define MIN(x, y) (((x) < (y)) ? (x) : (y))
+void fir_filter2(fir_t *fir, double *input, uint32_t ilength, double *output, uint32_t olength) {
+    double acc;
+        double *coeffp;
+        double *inputp;
+        int i,j;
+
+        //memcpy(&input[fir->num_taps-1], input, ilength*sizeof(double));
+        /*
+        for (n=0; n<ilength; n++)
+        {
+            coeffp = fir->fir_coef;
+            inputp = &input[fir->num_taps - 1 + n];
+            acc = 0;
+
+            for (k=0;k<fir->num_taps;k++)
+            {
+                acc += (*coeffp++)*(*inputp--);
+            }
+
+            output[n] = acc;
+        }
+         */
+    for (i=0;i<ilength-fir->num_taps;i++) {
+        acc = 0.0f;
+        for (j=0;j<fir->num_taps;j++) {
+            acc = fir->fir_coef[j]*input[ilength-j-1];
+        }
+        if (i<olength) {
+            output[i] = acc;
+        }
+    }
+
+        //memmove(&input[0], &input[ilength], (fir->num_taps-1)*sizeof(double));
+}
+
 uint32_t tick_start, tick_end,tick_1sec;
 
 #if __EMSCRIPTEN__