From ef53f705cf5708875a43fc314d741964ffa71637 Mon Sep 17 00:00:00 2001
From: Arturs Artamonovs <arturs.artamonovs@protonmail.com>
Date: Mon, 26 Jul 2021 09:50:19 +0100
Subject: Update to be compatible with web

---
 WasmAudio/main.c | 106 +++++++++++++++++++++++++++++++++++++++++++++++--------
 1 file changed, 92 insertions(+), 14 deletions(-)

(limited to 'WasmAudio')

diff --git a/WasmAudio/main.c b/WasmAudio/main.c
index c8a5191..9ddf5ba 100644
--- a/WasmAudio/main.c
+++ b/WasmAudio/main.c
@@ -35,6 +35,13 @@
     //#include <GLES2/gl2.h>
 #endif
 
+
+#ifdef __EMSCRIPTEN__
+#define KEEPALIVE EMSCRIPTEN_KEEPALIVE
+#else
+#define KEEPALIVE
+#endif
+
 #include "../FIR/firmath.h"
 
 #define SCREEN_WIDTH   320
@@ -53,6 +60,7 @@
 //Maximum recording time
 #define MAX_RECORDING_SECONDS (RECORDING_BUFFER_SECONDS+2)
 
+//SDL drawing recording
 int first_run=1;
 static int quit=0;
 static SDL_Window *window = NULL;
@@ -63,7 +71,7 @@ static SDL_AudioDeviceID playbackDeviceId = 0;
 int audio_buf_position=0;
 int current_state=0;
 
-
+//audio buffer vars
 int audio_rec_buffer_size=-1;
 int audio_rec_buffer_max_size=-1;
 static uint8_t audio_rec_buffer_[BUFSIZE];
@@ -72,9 +80,16 @@ static double process_buf[PROCESS_BUF_SIZE+100];
 static double process_buf2[PROCESS_BUF_SIZE+100];
 uint8_t *audio_rec_buffer=NULL;
 
+//FIR filter stuff
 FILE *f_1,*f_2;
 fir_t fir_lp;
 firw_t firw_lp;
+const int N=200;
+double h[N],w[N];
+int filter_N=60;
+int filter_FS_hz=48000;
+int filter_FC_hz=1000;
+double filter_FC;
 
 void audio_recording_callback(void *data, uint8_t *insamples, int len) {
     if (audio_buf_position<audio_rec_buffer_size) {
@@ -85,7 +100,7 @@ void audio_recording_callback(void *data, uint8_t *insamples, int len) {
 }
 
 void audio_playback_callback(void *data, uint8_t *outsamples, int len) {
-    printf("call play\n");
+    //printf("call play\n");
     if (audio_buf_position<audio_rec_buffer_size) {
         memcpy( outsamples, audio_rec_buffer+audio_buf_position,len);
         audio_buf_position += len;
@@ -116,14 +131,13 @@ void convert_double_to_f32() {
         float f = d;
         int32_t *i32_ = &f,i32=*i32_;
         
-        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+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);
     
     }
     //printf("\n");
-    
 }
  
 
@@ -146,6 +160,69 @@ void convert_f32_to_double() {
     
 }
 
+int KEEPALIVE get_sample_rate() {
+    return filter_FS_hz;
+}
+
+void set_sample_rate() {
+    
+}
+
+void set_cutoff_freq(int cutoff) {
+    if (cutoff < 0) {
+        cutoff = 0;
+        filter_FC_hz = cutoff;
+        return;
+    }
+    
+    if (cutoff > filter_FS_hz/2) {
+        cutoff = filter_FS_hz/2;
+        filter_FC_hz = cutoff;
+        filter_FC=1.0*cutoff/filter_FS_hz;
+        return;
+    }
+}
+
+int KEEPALIVE get_cutoff_freq() {
+    return filter_FC_hz;
+}
+
+int KEEPALIVE get_tap_number() {
+    return filter_N;
+}
+
+void set_tap_number(int tapN) {
+    if (tapN<10) {
+        tapN = 10;
+        return;
+        
+    }
+}
+
+int KEEPALIVE  recalculate_fir() {
+    int i = 0;
+    filter_FC=1.0*filter_FC_hz/filter_FS_hz;
+    fir_lp.num_taps =filter_N;
+    fir_lp.fir_coef = h;
+    firw_lp.num_taps = filter_N;
+    firw_lp.win_coef = w;
+        
+    for (i=0;i<N;i++) {
+        h[i] = 0.0;
+        w[i] = 0.0;
+    }
+    
+    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);
+    firw_blackman(&firw_lp);
+    //firw_rect(&firw_lp);
+    fir_convolute(&fir_lp, &firw_lp);
+    //fir_print_matlab(&fir_lp);
+    return 0;
+}
+
 
 void convert_dobule_up() {
     int i=0;
@@ -176,6 +253,7 @@ void save_to_matlab(char *name) {
     for (i=0;i<dumpSize;i++) {
         float f1=2.0f;
         fprintf(f," %.4f",process_buf[i]);
+        printf(" %.4f",process_buf[i]);
     }
 #endif
 #if 0
@@ -415,14 +493,11 @@ void main_loop()
 int main(int argc, const char * argv[]) {
     int i,count;
     
-    const int N=200;
-    double h[N],w[N];
-    int filter_N=60;
-    int filter_FS_hz=48000;
-    int filter_FC_hz=1000;
-    double filter_FC=1.0*filter_FC_hz/filter_FS_hz;
     
+    char *audio_rec_device_name=NULL;
+    char *audio_play_device_name=NULL;
     
+    filter_FC=1.0*filter_FC_hz/filter_FS_hz;
     fir_lp.num_taps =filter_N;
     fir_lp.fir_coef = h;
     firw_lp.num_taps = filter_N;
@@ -484,7 +559,10 @@ int main(int argc, const char * argv[]) {
     audio_rec_want.channels = 2;
     audio_rec_want.samples = 4096;
     audio_rec_want.callback = audio_recording_callback;
-    recordingDeviceId = SDL_OpenAudioDevice(SDL_GetAudioDeviceName(1, SDL_TRUE ), SDL_TRUE, &audio_rec_want, &audio_rec_have, SDL_AUDIO_ALLOW_FORMAT_CHANGE|SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
+    
+    audio_rec_device_name =  SDL_GetAudioDeviceName(0, SDL_TRUE );
+    printf("Use for recording device %s\n",audio_rec_device_name);
+    recordingDeviceId = SDL_OpenAudioDevice(SDL_GetAudioDeviceName(0, SDL_TRUE ), SDL_TRUE, &audio_rec_want, &audio_rec_have, SDL_AUDIO_ALLOW_FORMAT_CHANGE|SDL_AUDIO_ALLOW_FREQUENCY_CHANGE);
     
     if (audio_rec_want.freq != audio_rec_have.freq) {
         printf("Freq changed %d -> %d\n",audio_rec_want.freq,audio_rec_have.freq);
@@ -545,5 +623,5 @@ int main(int argc, const char * argv[]) {
     fclose(f_1);
     fclose(f_2);
     
-    return 0;
+    //return 0;
 }
-- 
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