Staudio on a wav stream in memory (instead of a file on disk)

[Thierry]

Hi folks,

I fell in love with streamlit for buiding interactive educational webapps for understanding signal processing (see my project)

I absolutely need to be able to play sounds from generated content, and saving+reading it from a file is too slow. I know several people have mentioned this problem before and there is an official request about this. I just want to bring an almost solution and see if someone else can contribute.
This ALMOST works :

import streamlit as st
from numpy import *
import scipy.io.wavfile as wav
import io
fe=10000;
t=arange(0.0,1,1/fe)
signal=asin(2pift)
bytes_wav = byte()
byte_io = io.BytesIO(bytes_wav)
wav.write(byte_io, fe, around(signal) )
st.audio(byte_io)

We DO hear sthg, which changes if you change the freq of the sine
It lasts 1 second as expected
But the sound, although sine-rleated, is corrupted, as if the format of the data was not correctly interpreted.
Strangely enough, if I remove the “around”, then the silder still lasts one second, but it is silent.

Summarizing I am this close to the solution but stucked.

Thierry

[martin-hunt]

import streamlit as st
import numpy as np
import soundfile
import io

# frequency
f = 5000

# sample_rate
sr = 16000

# time (1 sec)
t = np.arange(0.0, 1, 1/sr)

signal = np.sin(2 * np.pi * f * t)

byte_io = io.BytesIO()

sub = 'PCM_24'  # could be 'PCM_32' or 'FLOAT'
soundfile.write(byte_io, signal, sr, subtype=sub, format='WAV')

st.audio(byte_io)

[Thierry]

THANKS A LOT!
It works with ‘FLOAT’
I think this will help other poeple too (I had first checked on the forum and found non answer to this issue).