From e4619445203c9b17788cbcedeac4f4918b2ac2b3 Mon Sep 17 00:00:00 2001
From: Arturs Artamonovs <arturs.artamonovs@protonmail.com>
Date: Thu, 22 Jul 2021 09:40:38 +0100
Subject: clean the code

---
 WasmAudio/main.c | 110 ++++++++++++++++---------------------------------------
 1 file changed, 31 insertions(+), 79 deletions(-)

diff --git a/WasmAudio/main.c b/WasmAudio/main.c
index 38f5e1a..2ab9449 100644
--- a/WasmAudio/main.c
+++ b/WasmAudio/main.c
@@ -61,18 +61,15 @@ static SDL_Renderer *renderer = NULL;
 static SDL_AudioDeviceID recordingDeviceId = 0;
 static SDL_AudioDeviceID playbackDeviceId = 0;
 int audio_buf_position=0;
-//uint8_t *audio_play_buffer=NULL;
 int current_state=0;
 
 
 int audio_rec_buffer_size=-1;
 int audio_rec_buffer_max_size=-1;
-//int audio_play_buffer_size=-1;
-//int audio_play_buffer_max_size=-1;
 static uint8_t audio_rec_buffer_[BUFSIZE];
 const int process_buf_size = BUFSIZE4;
-static double process_buf[process_buf_size*4];
-static double process_buf2[process_buf_size*4];
+static double process_buf[process_buf_size+100];
+static double process_buf2[process_buf_size+100];
 uint8_t *audio_rec_buffer=NULL;
 
 
@@ -111,56 +108,42 @@ enum RecordingState
 
 void convert_double_to_f32() {
     int i=0;
-    printf("float sizeof=%lu\n",sizeof(float));
-    printf("double sizeof=%lu\n",sizeof(double));
     
     for (i=0;i<BUFSIZE2;i+=4) {
         double d = process_buf[i/4];
+        if (i/4 > BUFSIZE4) {
+            printf("Buffer overflow convert_double_to_f32");
+            exit(1);
+        }
         float f = d;
-        //printf("%f ",f);
-        //f = f*2147483647.0;
         int32_t *i32_ = &f,i32=*i32_;
         
-        //printf("%d %f\n",i32,f);
-        
-        //audio_rec_buffer[i+0] = ((int)i32>> 24)&0xff;
-        //audio_rec_buffer[i+1] = ((int)i32>> 16)&0xff;
-        //audio_rec_buffer[i+2] = ((int)i32>> 8)&0xff;
-        //audio_rec_buffer[i+3] =  ((int)i32&0xff);
-        
         audio_rec_buffer[i+3] = ((int)i32>> 24)&0xff;
         audio_rec_buffer[i+2] = ((int)i32>> 16)&0xff;
         audio_rec_buffer[i+1] = ((int)i32>> 8)&0xff;
         audio_rec_buffer[i+0] =  ((int)i32&0xff);
-        
-        //audio_rec_buffer[i+0] = ((int)f>> 24)&0xff;
-        //audio_rec_buffer[i+1] = ((int)f>> 16)&0xff;
-        //audio_rec_buffer[i+2] = ((int)f>> 8)&0xff;
-        //audio_rec_buffer[i+3] =  ((int)f&0xff);
-         
-        //memcpy(&f,&audio_rec_buffer[i],4);
+    
     }
     //printf("\n");
     
-    for (i=0;i<100;i+=4) {
-        fprintf(f_2, "%d %02x %02x %02x %02x\n", i/4,audio_rec_buffer[i],audio_rec_buffer[i+1],audio_rec_buffer[i+2],audio_rec_buffer[i+3]);
-    }
 }
  
 
 
 void convert_f32_to_double() {
     int i=0;
-    for (i=0;i<100;i+=4) {
-        fprintf(f_1, "%d %02x %02x %02x %02x\n", i/4,audio_rec_buffer[i],audio_rec_buffer[i+1],audio_rec_buffer[i+2],audio_rec_buffer[i+3]);
-    }
     for (i=0;i<BUFSIZE2;i+=4) {
         int32_t i32 = ((audio_rec_buffer[i+3] << 24) | (audio_rec_buffer[i+2] << 16) | (audio_rec_buffer[i+1] << 8) | (audio_rec_buffer[i+0]) );
         float *ff = &i32;
 
         //double d = f;
-        process_buf[i/4] = *ff;
-        printf("%f %f\n",ff,process_buf[i/4]);
+        if ((i/4)<BUFSIZE4) {
+            process_buf[i/4] = *ff;
+        } else {
+            printf("Buffer overflow convert_f32_to_double\n");
+            exit(0);
+        }
+        //printf("%f %f\n",ff,process_buf[i/4]);
     }
     
 }
@@ -178,29 +161,31 @@ void convert_dobule_up() {
     }
 }
 
-void save_to_matlab() {
+void save_to_matlab(char *name) {
     int i;
     FILE *f=NULL;
-    
-    f = fopen("B.mat","w+");
+    char namebuf[256];
+    snprintf(namebuf,sizeof(namebuf),"%s.mat",name);
+    f = fopen(namebuf,"w+");
     fprintf(f,"# Created by me\n");
-    fprintf(f,"# name: B\n");
+    fprintf(f,"# name: %s\n",name);
     fprintf(f,"# type: matrix\n");
     fprintf(f,"# rows: 1\n");
-    fprintf(f,"# columns: %d\n",BUFSIZE16);
+    int dumpSize=BUFSIZE16;
+    fprintf(f,"# columns: %d\n",dumpSize);
     
 #if 1
-    for (i=0;i<BUFSIZE16;i++) {
+    for (i=0;i<dumpSize;i++) {
         float f1=2.0f;
         fprintf(f," %.4f",process_buf[i]);
     }
 #endif
-#if 1
-    for (i=0;i<BUFSIZE16;i+=4) {
+#if 0
+    for (i=0;i<dumpSize;i+=4) {
         
         int32_t i32 = (float)((audio_rec_buffer[i+0] << 24) | (audio_rec_buffer[i+1] << 16) | (audio_rec_buffer[i+2] << 8) | (audio_rec_buffer[i+3]) );
         float ff=i32;
-        //fprintf(f," %.3f",ff);
+        fprintf(f," %.3f",ff);
         //printf(" %.3f",ff);
         
     }
@@ -297,25 +282,17 @@ int main_tick() {
                             //process recorderd buffer with low pass filter
                             if (current_state == RECORDED) {
                                 convert_f32_to_double();
-                                save_to_matlab();
+                                save_to_matlab("B1");
                                 //simple volume raise
 #if 0
                                 convert_dobule_up();
 #endif
                                 //fir filter apply
 #if 1
-                                printf("Apply low pass filter\n");
-                                
+                
                                 fir_filter(&fir_lp, process_buf, process_buf_size, process_buf2, process_buf_size);
-                                //memcpy(process_buf2,process_buf,process_buf_size*sizeof(double));
                                 memcpy(process_buf,process_buf2,process_buf_size*sizeof(double));
-                                //for (i=0;i<100;i++) {
-                                    //process_buf[i] = process_buf2[i];
-                                //    printf("[%d]=%f\n",i,process_buf[i]);
-                                //}
-                                
-                                //memmove(process_buf,process_buf2,process_buf_size*sizeof(double));
-                                
+                                save_to_matlab("B2");
 #endif
                                 convert_double_to_f32();
                             }
@@ -444,7 +421,7 @@ int main(int argc, const char * argv[]) {
     double h[N],w[N];
     int filter_N=60;
     int filter_FS_hz=48000;
-    int filter_FC_hz=20000;
+    int filter_FC_hz=1000;
     double filter_FC=1.0*filter_FC_hz/filter_FS_hz;
     
     
@@ -460,8 +437,8 @@ int main(int argc, const char * argv[]) {
     
     fir_init(&fir_lp, filter_N);
     firw_init(&firw_lp, filter_N);
-    //fir_sinc_lp(&fir_lp, filter_FC);
-    fir_sinc_hp(&fir_lp, filter_FC);
+    fir_sinc_lp(&fir_lp, filter_FC);
+    //fir_sinc_hp(&fir_lp, filter_FC);
     firw_blackman(&firw_lp);
     //firw_rect(&firw_lp);
     fir_convolute(&fir_lp, &firw_lp);
@@ -556,31 +533,6 @@ int main(int argc, const char * argv[]) {
     current_state = STOPPED;
     printf("State: STOPED\n");
     
-    
-    
-    
-    
-    //SDL_PauseAudioDevice(recordingDeviceId,0);
-    //!SDL_LockAudioDevice(recordingDeviceId);
-    //SDL_PauseAudioDevice(recordingDeviceId, 0);
-    //SDL_PauseAudio(0);
-    //SDL_Delay(4000);
-    //!SDL_UnlockAudioDevice(recordingDeviceId);
-    //!SDL_CloseAudio();
-    //SDL_CloseAudioDevice(recordingDeviceId);
-    /*
-    if (SDL_OpenAudio(&audio_want, &audio_have) < 0) {
-        SDL_Log("Failed to open audio: %s", SDL_GetError());
-    } else {
-        if (audio_have.format != audio_want.format) {
-            SDL_Log("We didn't get Float32 audio format.");
-        }
-        SDL_PauseAudio(0);
-        SDL_Delay(5000);
-        SDL_CloseAudio();
-    }
-    */
-    
     f_1 = fopen("pre.txt","w+");
     f_2 = fopen("post.txt","w+");
     
-- 
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