audio_block_t declare left and right outputs

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gtzack4

Member
I am creating an new audio object to emplemet a HRTF(head related transfer function). to make it sound like a sound is coming from locations in space. I have this code working in MATLAB but I am having a bit of trouble getting it to work in my teensy 3.6 with the audio hat.
I need help with a few concepts.

The idea is to:
take a mono signal from the I2S input (Lsig)
duplicate mono input(Rsig)
convolv Lsig and Rsig with spacetialized filters
playout I2S convololved signals

I feel that I am missing a basic understanding of how to left and right audio channels.
Can anyone point me to the right documentation or share some wisdom with me?

This is part of what is in my update method...

// sample code
audio_block_t *blockL;
audio_block_t *blockR;
short *bpL;
short *bpR;

blockL = reciveWritable(0);
blockR = reciveWritable(1);

bpL = blockL->data;
bpR = blockR->data;

// read in buff
for (int i, i <128,i++){
buf = *bpL++;
}

for (int i, i <128,i++){
*bpL++ = playbufL;
*bpR++ = playbufR;// <--gets stuck here
}
transmit(blockL,0); // does this trans only Left?
transmit(blockR,1); // does this trans only Right?
release(blockL);
release(blockR);

// fill playbufL & playbufR
 
It would help immensely if you posted all your code (in code tags).

Code:
  transmit(blockL,0); // does this trans only Left?
  transmit(blockR,1); // does this trans only Right?
Yes, to both.

Pete
 
Your sample code says this:

Code:
  *bpR++ = playbufR[i];// <--gets stuck here

But "playbufR" isn't even one of the variables defined anywhere in the sample code. How can you expect anyone to offer advice about why that it gets stuck there where we can't even know how "playbufR" is defined?

However, one issue I do see is a lack of checking whether blockL and blockR are NULL. You must check for NULL pointers to handle the case where no data arrives. If you write using a NULL pointer, the CPU will memory fault which effectively stops your program. Maybe that's why it's getting stuck?

You also need to properly handle the case where one input has data and the other is NULL. Typically stereo effects would just release the 1 non-NULL block and return without transmitting anything. Whatever you do, you must always call release() for any non-NULL block pointer you get using the receive functions or with allocate().
 
Here is the cpp and the h file for my code. from a little more digging I found that BlockR is always NULL. Can anyone see why that would be?

Code:
#include "HRTF.h"

/******************************************************************/
//                Audio HRTF
// Written by Zack Ennis
/*******************************************************************/


boolean HRTF::begin(int status)
{
		
	enabled = 1;
	state = 0;
	angle = 0;
    Serial.println("begin");
				
  return(true);
}

void HRTF::passThrough(int stat)
{
    //Serial.println("pass");
  passThru=stat;
}


void HRTF::setfilts(int angle)
{
    Serial.println("setfilts");
    int tempAngle = angle % 360;
    //fprintf('%1.1f\n',tempAngle)
    if      ((tempAngle >= 0) & (tempAngle < 30))
        {azL = 0; 
        azR = 30;
        lfilt1 = impL0_0;    
        lfilt2 = impL30_0;
        rfilt1 = impR0_0;    
        rfilt2 = impR30_0;
        }
    else if  ((tempAngle >= 30) & (tempAngle < 60))
        {azL = 30; 
        azR = 60;
        lfilt1 = impL30_0;    
        lfilt2 = impL60_0;
        rfilt1 = impR30_0;    
        rfilt2 = impR60_0;
        }
    else if  ((tempAngle >= 60) & (tempAngle < 90))
        {azL = 60; 
        azR = 90;
        lfilt1 = impL60_0;    
        lfilt2 = impL90_0;
        rfilt1 = impR60_0;    
        rfilt2 = impR90_0;
        }
    else if  ((tempAngle >= 90) & (tempAngle < 120))
        {azL = 90; 
        azR = 120;
        lfilt1 = impL90_0;    
        lfilt2 = impL120_0;
        rfilt1 = impR90_0;    
        rfilt2 = impR120_0;
        }
    else if  ((tempAngle >= 120) & (tempAngle < 150))
        {azL = 120; 
        azR = 150;
        lfilt1 = impL120_0;    
        lfilt2 = impL150_0;
        rfilt1 = impR120_0;    
        rfilt2 = impR150_0;
        }
    /*else if  ((tempAngle >= 150) & (tempAngle < 180))
        {azL = 150; 
        azR = 180;
        lfilt1 = impL150_0;    
        lfilt2 = impL180_0;
        rfilt1 = impR150_0;    
        rfilt2 = impR180_0;
        }
    else if  ((tempAngle >= 180) & (tempAngle < 210))
        {azL = 180; 
        azR = 210;
        lfilt1 = impL180_0;    
        lfilt2 = impL210_0;
        rfilt1 = impR180_0;    
        rfilt2 = impR210_0;
        }
    else if  ((tempAngle >= 210) & (tempAngle < 240))
        {azL = 210; 
        azR = 240;
        lfilt1 = impL210_0;    
        lfilt2 = impL240_0;
        rfilt1 = impR210_0;    
        rfilt2 = impR240_0;
        }
    else if  ((tempAngle >= 240) & (tempAngle < 270))
        {azL = 240; 
        azR = 270;
        lfilt1 = impL240_0;    
        lfilt2 = impL270_0;
        rfilt1 = impR240_0;    
        rfilt2 = impR270_0;
        }
    else if  ((tempAngle >= 270) & (tempAngle < 300))
        {azL = 270; 
        azR = 300;
        lfilt1 = impL270_0;    
        lfilt2 = impL300_0;
        rfilt1 = impR270_0;    
        rfilt2 = impR300_0;
        }
    else if  ((tempAngle >= 300) & (tempAngle < 330))
        {azL = 300; 
        azR = 330;
        lfilt1 = impL300_0;    
        lfilt2 = impL330_0;
        rfilt1 = impR300_0;    
        rfilt2 = impR330_0;
        }
    else if  ((tempAngle >= 330) & (tempAngle < 360))
        {azL = 330; 
        azR = 360;
        lfilt1 = impL330_0;    
        lfilt2 = impL0_0;
        rfilt1 = impR330_0;    
        rfilt2 = impR0_0;
        }
        */
    else
        {Serial.println("out of range");}
    
    scalesL = abs((tempAngle - azL)/30);
    scalesR = abs((tempAngle - azR)/30);

    //arm_scale_f32(*inVec,scale,&outVec ,bufferSize)
    arm_scale_f32(lfilt1,scalesR,T1 ,buffSize*2);
    arm_scale_f32(lfilt2,scalesL,T2 ,buffSize*2);
    arm_scale_f32(rfilt1,scalesR,T3 ,buffSize*2);
    arm_scale_f32(rfilt2,scalesL,T4 ,buffSize*2);
    
    //arm_add_f32(*inA,*inB,*out,bufferSize)
    arm_add_f32(T1,T2,lfilt,buffSize*2);
    arm_add_f32(T3,T4,rfilt,buffSize*2);
	enabled = 1;
    Serial.println("end setfilts");

}



void HRTF::update(void)
{
    
    audio_block_t *blockL;
    audio_block_t *blockR;
    short *bpL;
    short *bpR;
    
	if (enabled != 1 ) return;
	blockL = receiveWritable(0); // left 
	blockR = receiveWritable(1); // right 
        Serial.println("here-2");
	if (!blockL || !blockR) {
            Serial.println("here-1");
		if (blockL) release(blockL); // maybe an extra if statement here but if one
		if (blockR) release(blockR); // of the blocks is NULL then it's trouble anyway
		return;
	}  
       if (blockL) {
		switch (state) {
		case 0:
                        bpL = blockL->data;
                        bpR = blockR->data;
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				buffer[i] = *bpL++;
                
			}
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				*bpL++ = tbufferL[ i];   // tbuffer contains results of last 
                                *bpR++ = tbufferR[ i];  // tbuffer contains results of last 
			}
			transmit(blockL, 0);
                        transmit(blockR, 1);
			release(blockL);
                        release(blockR);
			state = 1;
			break;
		case 1:
			bpL = blockL->data;
                        bpR = blockR->data;
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				buffer[128+i] = *bpL++;
                
			}
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				*bpL++ = tbufferL[128+ i];   // tbuffer contains results of last 
                                *bpR++ = tbufferR[128+ i];  // tbuffer contains results of last 
			}
			transmit(blockL, 0);
                        transmit(blockR, 1);
			release(blockL);
                        release(blockR);
			state = 2;
			break;
		case 2:
			bpL = blockL->data;
            bpR = blockR->data;
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				buffer[256+i] = *bpL++;
                
			}
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
                *bpL++ = tbufferL[256+i];   // tbuffer contains results of last FFT/multiply/iFFT processing (convolution filtering)
                *bpR++ = tbufferR[256+i]; // tbuffer contains results of last FFT/multiply/iFFT processing (convolution filtering)
			}
			transmit(blockL, 0);
            transmit(blockR, 1);
			release(blockL);
            release(blockR);
			state = 3;
			break;
		case 3:
			bpL = blockL->data;
            bpR = blockR->data;
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				buffer[384+i] = *bpL++;
                
			}
			for (int i = 0; i < AUDIO_BLOCK_SAMPLES; i++) {
				*bpL++ = tbufferL[384+i];   // tbuffer contains results of last FFT/multiply/iFFT processing (convolution filtering)
                *bpR++ = tbufferR[384+i];  // tbuffer contains results of last FFT/multiply/iFFT processing (convolution filtering)
			}
			transmit(blockL, 0);
            transmit(blockR, 1);
			release(blockL);
            release(blockR);
			state = 0;

            if (idx < 44100/1024*90){//////////////////////////////////////////////////////////////////////////////////////////
                idx= idx +10;
            }
            else{
                idx = 0;
            }

            Serial.println(idx*1024/44100+1);
            setfilts(idx*1024/44100+1);
			// 4 blocks are in- now do the FFT1024,complex multiply and iFFT1024  on 512samples of data
			// using the overlap/add method
			// 1st convert Q15 samples to float
			arm_q15_to_float(buffer, float_buffer_L, 512); 
			arm_q15_to_float(buffer, float_buffer_R, 512); 
		   // float_buffer samples are now standardized from > -1.0 to < 1.0
			if (passThru ==0) {
				memset(FFT_bufferL + 1024, 0, sizeof(FFT_bufferL) / 2);    // zero pad last half of array- necessary to prevent aliasing in FFT
                memset(FFT_bufferR + 1024, 0, sizeof(FFT_bufferR) / 2);    // zero pad last half of array- necessary to prevent aliasing in FFT
				
				
				//fill FFT_buffer with current audio samples
				k = 0;
				for (i = 0; i < 512; i++)
				{
					FFT_bufferL[k++] = float_buffer_L[i];   // real
                    FFT_bufferR[k] = float_buffer_R[i];   // real
					FFT_bufferL[k++] = float_buffer_L[i];   // imag
					FFT_bufferR[k] = float_buffer_R[i];   // imag
				}
				// calculations are performed in-place in FFT routines
				arm_cfft_f32(&arm_cfft_sR_f32_len1024, FFT_bufferL, 0, 1);// perform complex FFT
                arm_cfft_f32(&arm_cfft_sR_f32_len1024, FFT_bufferR, 0, 1);// perform complex FFT
				
                arm_cmplx_mult_cmplx_f32(FFT_bufferL, lfilt, iFFT_bufferL, FFT_length);   // complex multiplication in Freq domain = convolution in time domain
				arm_cmplx_mult_cmplx_f32(FFT_bufferR, rfilt, iFFT_bufferR, FFT_length);   // complex multiplication in Freq domain = convolution in time domain
				
                arm_cfft_f32(&arm_cfft_sR_f32_len1024, FFT_bufferL, 1, 1);  // perform complex inverse FFT
                arm_cfft_f32(&arm_cfft_sR_f32_len1024, FFT_bufferR, 1, 1);  // perform complex inverse FFT
				k = 0;
				l = 1024;
				for (int i = 0; i < 512; i++) {
					float_buffer_L[i] = last_sample_buffer_L[i] + iFFT_bufferL[k++];   // this performs the "ADD" in overlap/Add
					last_sample_buffer_L[i] = iFFT_bufferL[l++];				// this saves 512 samples (overlap) for next time around
                    float_buffer_R[i] = last_sample_buffer_R[i] + iFFT_bufferR[k];   // this performs the "ADD" in overlap/Add
					last_sample_buffer_R[i] = iFFT_bufferR[l];				// this saves 512 samples (overlap) for next time around
					k++;
					l++;
				}
			} //end if passTHru
			// convert floats to Q15 and save in temporary array tbuffer
			arm_float_to_q15(&float_buffer_L[0], &tbufferL[0], BUFFER_SIZE*4);
            
            arm_float_to_q15(&float_buffer_R[0], &tbufferR[0], BUFFER_SIZE*4);
			break;
		}
	}
}

Code:
#ifndef HRTF_h_
#define HRTF_h_

#include "Arduino.h"
#include "AudioStream.h"
#include <arm_math.h>
#include <arm_const_structs.h>
//#include <C:\Users\RHCB_Subject\Documents\Arduino\SitCom\define_freq_filts.h>
//#include <define_freq_filts.h>
/******************************************************************/
//                Audio HRTF
// Written by Zack Ennis APL 2019
/******************************************************************/

class HRTF : public AudioStream
{
public:
	HRTF(void) : AudioStream(2, inputQueueArray)                       //, num_chorus(2)   
	{
	}

  boolean begin(int status);
  virtual void update(void);
  void passThrough(int stat);
  void setfilts(int angle);

private:
#define BUFFER_SIZE 128
  audio_block_t *inputQueueArray[2];
  int16_t *sp_L;
  volatile uint8_t state;
  volatile int angle;
  int i;
  int k;
  int l;
  int passThru;
  int enabled;
  const uint32_t FFT_length = 1024;
  const uint buffSize = 1024;
  volatile int idx = 0;

  
  float32_t *lfilt1;
  float32_t *lfilt2;
  float32_t *rfilt1;
  float32_t *rfilt2;
  float32_t azL = 0;
  float32_t azR = 0;
  float32_t scalesL = 0;
  float32_t scalesR = 0;

  float32_t lfilt[2048] __attribute__((aligned(4)));
  float32_t rfilt[2048] __attribute__((aligned(4)));

  float32_t T1[2048] __attribute__((aligned(4)));
  float32_t T2[2048] __attribute__((aligned(4)));
  float32_t T3[2048] __attribute__((aligned(4)));
  float32_t T4[2048] __attribute__((aligned(4)));

  

  float32_t float_buffer_L[512]__attribute__((aligned(4)));
  float32_t float_buffer_R[512]__attribute__((aligned(4)));
  float32_t last_sample_buffer_L[512];
  float32_t last_sample_buffer_R[512];

  float32_t FFT_bufferL[2048] __attribute__((aligned(4)));
  float32_t iFFT_bufferL[2048] __attribute__((aligned(4)));
  float32_t FFT_bufferR[2048] __attribute__((aligned(4)));
  float32_t iFFT_bufferR[2048] __attribute__((aligned(4)));
  

  int16_t buffer[512] __attribute__((aligned(4)));
  int16_t tbufferL[512]__attribute__((aligned(4)));
  int16_t tbufferR[512]__attribute__((aligned(4)));

  float32_t impL0_0[2048] = {  0.001172876408,   0.000000000000,  0.000519166999,   0.000667846996, -0.000869282871,   0.001768646871, -0.002541926208,   0.002445455515, -0.005546839202,   0.001695517515, -0.011754702314,  -0.000306415502, -0.023221174558,  -0.002181674909, -0.041902008143,  -0.000362784205, -0.066551061346,   0.011718624335, -0.089117026025,   0.039163296806, -0.098538067275,   0.078361493504, -0.090760790995,   0.117821120794, -0.072002164027,   0.148708679935, -0.049979555360,   0.171551864186, -0.025479847586,   0.190353815189,  0.004496640261,   0.203961137011,  0.038681720213,   0.207006910165,  0.070569070416,   0.196908402566,  0.093581327201,   0.176444664020,  0.104256419210,   0.151271967665,  0.102485134070,   0.127820365239,  0.091913164478,   0.111598017243,  0.078721757894,   0.104167746327,  0.067223673001,   0.102558219923,  0.057488299186,   0.103456117558,  0.048488766416,   0.106362007333,  0.041053616831,   0.111273446484,  0.035692037043,   0.116217342484,  0.030274053852,   0.119703752226,  0.022657180424,   0.123295248939,  0.013542932181,   0.129157939091,  0.004368210720,   0.137211872977, -0.005260494331,   0.147097381718, -0.015386298910,   0.160510216913, -0.023221356782,   0.178667720854, -0.025744821587,   0.199321969547, -0.023151258472,   0.218884576530, -0.017524344374,   0.235808702944, -0.010171416731,   0.249822787662, -0.002533329682,   0.260227291639,  0.002680730408,   0.267611302580,  0.004145193057,   0.275176262927,  0.003996045960,   0.285624033140,  0.004947656624,   0.298325511994,  0.007192592307,   0.311577334298,  0.010148134968,   0.325421498631,  0.014777988509,   0.339959715994,  0.021573520278,   0.353325854677,  0.028429377423,   0.364096999232,  0.033191807155,   0.373758759116,  0.036399574200,   0.384326242087,  0.039172277245,   0.395583589487,  0.040615121455,   0.407072693528,  0.039877770462,   0.420557205916,  0.038646041549,   0.437854957188,  0.038986271367,   0.458241017966,  0.040731860448,   0.480483133677,  0.043442870168,   0.505328836101,  0.048734699138,   0.533460109354,  0.058017467594,   0.563196987637,  0.070033603706,   0.592957649836,  0.083342451330,   0.624028461751,  0.099370958795,   0.658321126446,  0.120621025787,   0.695300148222,  0.147990458304,   0.733385199182,  0.182224974400,   0.771949267549,  0.225417509801,   0.809200886997,  0.277920557833,   0.840485840033,  0.335667162256,   0.861958132098,  0.393488396786,   0.874479664002,  0.449650248129,   0.881519866747,  0.505138467211,   0.885068573252,  0.560940369152,   0.885656160043,  0.618562324551,   0.883517531261,  0.680369394870,   0.876514619087,  0.745647928883,   0.859244021113,  0.807827079362,   0.828009470710,  0.858778001160,   0.785877878999,  0.895063530277,   0.740665596621,  0.918499765104,   0.699590089308,  0.933391671012,   0.667626540867,  0.946142004965,   0.647778980156,  0.964947180763,   0.638822156224,  0.995567347536,   0.633909245139,  1.037435223554,   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float32_t impR0_0[2048] = { -0.057350557593,   0.000000000000, -0.058271758658,   0.000161119468, -0.059900681947,   0.001305847911, -0.061146530920,   0.001966059101, -0.063655743506,   0.000285870477, -0.070423967032,  -0.003150718352, -0.083496254816,  -0.005663389849, -0.103572458733,  -0.003191116676, -0.128438252004,   0.009838837298, -0.150621413263,   0.037133190362, -0.160859582871,   0.075007478920, -0.156251263463,   0.113966083850, -0.141506002737,   0.147760357024, -0.120577683207,   0.176958417399, -0.091897822178,   0.201765387974, -0.054719627549,   0.216623872976, -0.015371644732,   0.215837303852,  0.016947894767,   0.200785113143,  0.037454207575,   0.177979378901,  0.045913914368,   0.153329477897,  0.043521149808,   0.131441973446,  0.033493275059,   0.116579728293,  0.021475029187,   0.109929413804,  0.011273568153,   0.108260797800,  0.002186516795,   0.108446542052, -0.007077133843,   0.110860279381, -0.015048915619,   0.116048455981, -0.020714723031,   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......
 
Code:
	blockR = receiveWritable(1); // right
Since the input signal is mono in the left channel, you don't need to receive a buffer from the right channel. Just allocate one and copy the data from the left - no need to check if blockR is NULL.
Code:
	blockR = allocate(); // right
      //add code to copy left block to right. E.g.
      memcpy(blockR->data,blockL->data,AUDIO_BLOCK_SAMPLES*2);

Code:
if      ((tempAngle >= 0) & (tempAngle < 30))
The & should be &&

Pete
 
So I found out why why blockR was always null. I did not define the audio connection correctly. And I now have audio. The audio is extremely noise though. not sure of the cause yet but maybe due to time it takes to do both convolutions is longer then the time it takes to play the last 128 samples ( in case 3 in the cpp). This can be handled better but I will make sure that is the issue first.


I believe this is whats happening correct me if I am wrong...

One or two I2S channels are transmitted to the convo.
It goes to the convo update method
The convo update method waits till both I2S channels
It checks to see what state the convo update method is in
Does the corresponding state in the case statement.
Transmits BlockL BlockR
Release BlockL BlockR

starts over....







Code:
AudioIputsI2S                    i2s1;
HRTF                                 convo;
AudioMixer4                      mixer1;
AudioMixer4                      mixer2;
AudioOutputsI2S               i2s2;
AudioConnection               patchChord1(i2s1, 0, convo, 0 );
AudioConnection               patchChord2(i2s1, 0, convo, 1 ); // I added this line have audio now
AudioConnection               patchChord3(convo, 0, mixer1, 0);
AudioConnection               patchChord4(convo, 0, mixer2, 0);
AudioConnection               patchChord5(mixer1, 0, i2s2, 0);
AudioConnection               patchChord6(mixer1, 0, i2s2, 1);
AudioControlSGTL5000
 
As I mentioned in #6, you don't need to define the right channel in the AudioConnections (it would have helped if you had posted ALL your code in #5).

Pete
 
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