# -*- coding: utf-8 -*-

# Copyright 2018-2019 Streamlit Inc.

#

# Licensed under the Apache License, Version 2.0 (the "License");

# you may not use this file except in compliance with the License.

# You may obtain a copy of the License at

#

# http://www.apache.org/licenses/LICENSE-2.0

#

# Unless required by applicable law or agreed to in writing, software

# distributed under the License is distributed on an "AS IS" BASIS,

# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

# See the License for the specific language governing permissions and

# limitations under the License.

import io

import streamlit as st

import numpy as np

import wave

st.title("Audio test")

st.title("Generated audio (440Hz sine wave)")

def note(freq, length, amp, rate):

t = np.linspace(0, length, length * rate)

data = np.sin(2 * np.pi * freq * t) * amp

return data.astype(np.int16)

frequency = 440 # hertz

nchannels = 1

sampwidth = 2

sampling_rate = 44100

duration = 89 # Max size, given the bitrate and sample width

comptype = "NONE"

compname = "not compressed"

amplitude = 10000

nframes = duration * sampling_rate

x = st.text("Making wave...")

sine_wave = note(frequency, duration, amplitude, sampling_rate)

f = wave.open("sound.wav", "w")

f.setparams((nchannels, sampwidth, int(sampling_rate), nframes, comptype, compname))

x.text("Converting wave...")

f.writeframes(sine_wave)

f.close()

with io.open("sound.wav", "rb") as f:

x.text("Sending wave...")

x.audio(f)

st.title("Audio from a URL")

def shorten_audio_option(opt):

return opt.split("/")[-1]

song = st.selectbox(

"Pick an MP3 to play",

(

"https://www.soundhelix.com/examples/mp3/SoundHelix-Song-1.mp3",

"https://www.soundhelix.com/examples/mp3/SoundHelix-Song-3.mp3",

"https://www.soundhelix.com/examples/mp3/SoundHelix-Song-8.mp3",

),

0,

shorten_audio_option,

)

st.audio(song)