Arduino

Reference Language | Libraries | Comparison | Changes

Audio

## begin()

#### Description

Initializes the Audio library by specifying the target sample rate and size of the audio buffer.

#### Syntax

Audio.begin(rate, size);

#### Parameters

rate (int) : the sample rate of the sound file. If stereo, double the rate (ex. 44100Khz stereo = 88200).

size (int) : the size of the audio buffer in milliseconds.

#### Returns

nothing

#### Example

/*
Demonstrates the use of the Audio library for the Arduino Due
Hardware required :
*Arduino shield with a SD card on CS 4 (the Ethernet sheild will work)
*Audio amplifier circuit with speaker attached to DAC0
Original by Massimo Banzi September 20, 2012
Modified by Scott Fitzgerald October 19, 2012
*/
#include <SD.h>
#include <SPI.h>
#include <Audio.h>
void setup()
{
// debug output at 9600 baud
Serial.begin(9600);
// setup SD-card
Serial.print("Initializing SD card...");
if (!SD.begin(4)) {
Serial.println(" failed!");
return;
}
Serial.println(" done.");
// hi-speed SPI transfers
SPI.setClockDivider(4);
// 44100Khz stereo => 88200 sample rate
// 100 mSec of prebuffering.
Audio.begin(88200, 100);
}
void loop()
{
int count=0;
// open wave file from sdcard
File myFile = SD.open("test.wav");
if (!myFile) {
// if the file didn't open, print an error and stop
Serial.println("error opening test.wav");
while (true);
}
const int S=1024; // Number of samples to read in block
short buffer[S];
Serial.print("Playing");
// until the file is not finished
while (myFile.available()) {
// read from the file into buffer
myFile.read(buffer, sizeof(buffer));
// Prepare samples
int volume = 1024;
Audio.prepare(buffer, S, volume);
// Feed samples to audio
Audio.write(buffer, S);
// Every 100 block print a '.'
count++;
if (count == 100) {
Serial.print(".");
count = 0;
}
}
myFile.close();
Serial.println("End of file. Thank you for listening!");
while (true) ;
}
[Get Code]
Reference Home

Corrections, suggestions, and new documentation should be posted to the Forum.

The text of the Arduino reference is licensed under a Creative Commons Attribution-ShareAlike 3.0 License. Code samples in the reference are released into the public domain.

### Share

### This link has expired.
Please re-subscribe to our Newsletters.

### Subscribe to our Newsletters

Email

Please enter a valid email to subscribe

Arduino Newsletter
Arduino Store Newsletter

### Confirm your email address

We need to confirm your email address.
To complete the subscription, please click the link in the email we just sent you.

Thank you for subscribing!

Arduino
via Egeo 16
Torino, 10131
Italy

###### Newsletter

- ©2015 Arduino
- Copyright Notice
- Contact us
- About us
- Careers