File content as of revision 0:b4c1e32627f2:

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#include "sample_select.h"

#if (SAMPLE_PROGRAM_NO == 11)
// SAMPLE_PROGRAM_NO 11 : USBAudio sample
//
// Audio loopback example use:
// 1. Select "Mbed Audio" as your sound device
// 2. Play a song or audio file
// 3. Record the output using a program such as Audacity
// [Attention!] Delete the "OVERRIDE_CONSOLE_USBSERIAL" macro in "mbed_app.json" file if it is set.

#include "mbed.h"
#include "USBAudio.h"

int main() {
    USBAudio audio(true, 44100, 2, 44100, 2);

    printf("Looping audio\r\n");
    static uint8_t buf[128];
    while (true) {
        if (!audio.read(buf, sizeof(buf))) {
            memset(buf, 0, sizeof(buf));
        }
        audio.write(buf, sizeof(buf));
    }
}

#endif