alpereira7

/*
 * Simple sound playback using ALSA API and libasound.
 *
 * Compile:
 * $ cc -o play sound_playback.c -lasound
 * 
 * Usage:
 * $ ./play <sample_rate> <channels> <seconds> < <file>
 * 
 * Examples:

alpereira7

/* 
  A Minimal Capture Program

  This program opens an audio interface for capture, configures it for
  stereo, 16 bit, 44.1kHz, interleaved conventional read/write
  access. Then its reads a chunk of random data from it, and exits. It
  isn't meant to be a real program.

  From on Paul David's tutorial : http://equalarea.com/paul/alsa-audio.html

alpereira7

/* 
* file:           capture_nb_chan.c
* description:    Simple alsa API example. Get the min and max number of channels supported by capture audio device and other values.
* doc:            https://www.alsa-project.org/alsa-doc/alsa-lib/index.html
* install asound: apt-get install libasound2
*                 apt-get install libasound2-dev
* compile:        gcc -o capture_nb_chan capture_nb_chan.c -lasound
* execute:        ./capture_nb_chan
* expected output (something similar to) :
*                                         Min channels: 2. (0)

alpereira7

Download driver

curl 'https://dlcdnets.asus.com/pub/ASUS/wireless/USB-BT400/DR_USB_BT400_1201710_Windows.zip' \
  -o bt400-driver.zip

Driver & tools for bt400 can be found here

Find out what is a filename for your driver

Plug device and do

alpereira7

// Simple program that detects nearby Bluetooth devices.
// Based on https://people.csail.mit.edu/albert/bluez-intro/c404.html#simplescan.c
// Enhanced with comments and personal notes.

// To compile:
// `gcc -o simplescan simplescan.c -lbluetooth`
// Install libbluetooth-dev:
// `sudo apt-get install libbluetooth-dev`

#include <stdio.h>

alpereira7

// Simple program to read and write Class of Device.
// To compile: `gcc -o rw_cod rw_cod.c -lbluetooth`
// To install lbluetooth: `apt-get install libbluetooth-dev`
// Execute with 'sudo'
// Note the original CoD first because it has strict rules, you might need to write it back later.

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h> // for close()
#include <bluetooth/bluetooth.h>

alpereira7

/* 
* file:           playback_nb_chan.c
* description:    Simple alsa API example. Get the min and max number of channels supported by playback audio device and other values.
* doc:            https://www.alsa-project.org/alsa-doc/alsa-lib/index.html
* install asound: apt-get install libasound2
*                 apt-get install libasound2-dev
* compile:        gcc -o playback_nb_chan playback_nb_chan.c -lasound
* execute:        ./playback_nb_chan
* expected output (something similar to) :
*                                         Min channels: 2. (0)