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191 lines (142 loc) · 3.3 KB
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/*
Copyright (c) 2016 Arduino LLC. All right reserved.
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
This library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include <I2S.h>
#include "AudioOutI2S.h"
AudioOutI2SClass::AudioOutI2SClass() :
_input(NULL),
_loop(false),
_paused(false)
{
}
AudioOutI2SClass::~AudioOutI2SClass()
{
}
int AudioOutI2SClass::canPlay(AudioIn& input)
{
int bitsPerSample = input.bitsPerSample();
int channels = input.channels();
if (bitsPerSample != 8 && bitsPerSample != 16 && bitsPerSample != 32) {
return 0;
}
if (channels != 1 && channels != 2) {
return 0;
}
return 1;
}
int AudioOutI2SClass::play(AudioIn& input)
{
return startPlayback(input, false);
}
int AudioOutI2SClass::loop(AudioIn& input)
{
return startPlayback(input, true);
}
int AudioOutI2SClass::pause()
{
if (!isPlaying()) {
return 0;
}
_paused = true;
return 1;
}
int AudioOutI2SClass::resume()
{
if (!_paused) {
return 0;
}
_paused = false;
// play some silence to get things going
uint8_t silence[512];
memset(silence, 0x00, sizeof(silence));
I2S.write(silence, sizeof(silence));
I2S.write(silence, sizeof(silence));
return 1;
}
int AudioOutI2SClass::stop()
{
if (!_input) {
return 0;
}
endInput(_input);
_input = NULL;
I2S.end();
return 1;
}
int AudioOutI2SClass::isPlaying()
{
return !_paused && (_input != NULL);
}
int AudioOutI2SClass::isPaused()
{
return _paused;
}
int AudioOutI2SClass::startPlayback(AudioIn& input, bool loop)
{
if (_input) {
stop();
}
I2S.onTransmit(AudioOutI2SClass::onI2STransmit);
if (!I2S.begin(I2S_PHILIPS_MODE, input.sampleRate(), input.bitsPerSample())) {
return 0;
}
if (!beginInput(&input)) {
I2S.end();
return 0;
}
_input = &input;
_loop = loop;
uint8_t silence[512];
memset(silence, 0x00, sizeof(silence));
I2S.write(silence, sizeof(silence));
I2S.write(silence, sizeof(silence));
return 1;
}
void AudioOutI2SClass::onTransmit()
{
if (!_input || _paused) {
return;
}
int channels = _input->channels();
uint8_t data[512];
size_t length = sizeof(data);
if (channels == 1) {
length /= 2;
}
int n = readInput(_input, data, length);
if (n == 0) {
if (!_loop) {
// non-looped playback, we are done
stop();
return;
}
// reset the input
if (!resetInput(_input)) {
I2S.end();
return;
}
// read the input (again)
n = readInput(_input, data, length);
}
if (channels == 1) {
monoToStereo(data, n, _input->bitsPerSample());
n *= 2;
}
I2S.write(data, n);
}
void AudioOutI2SClass::onI2STransmit()
{
AudioOutI2S.onTransmit();
}
AudioOutI2SClass AudioOutI2S;