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player.cpp
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player.cpp
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#include "player.h"
#include "arfariusapplication.h"
#include "playlistmodel.h"
#include "playlistitem.h"
#include "avexception.h"
#include "avfile.h"
#include "qcoreaudio.h"
#include <QtConcurrentRun>
#include <QSemaphore>
#include <QSettings>
#include <QTimer>
#include <QDebug>
QString formatTime(size_t time)
{
int h,m,s;
s = time % 60;
m = time / 60 % 60;
h = time / 60 / 60;
if (h > 0)
return QString("%1:%2:%3").arg(h).arg(m, 2, 10, QChar('0')).arg(s, 2, 10, QChar('0'));
else
return QString("%1:%2").arg(m).arg(s, 2, 10, QChar('0'));
}
Player::Player(QObject *parent) :
QObject(parent),
ca(new QCoreAudio(this)),
file(nullptr), file_future(), eject_future(),
ring(0), ring_semaphor(0), ring_size(0), samples_elapsed(0),
state(Player::STOP), quiet(false)
{
qRegisterMetaType<Player::State>("Player::State");
ca->connectInput(this);
_sample_rate = ca->getDeviceSampleRate();
_channels = 2;
ring_size = _sample_rate / 4;
ring = new MemRing<av_sample_t>(ring_size);
ring_semaphor = new QSemaphore(ring_size);
}
Player::~Player()
{
if (file) {
ejectFile();
}
if (ca) {
stopStream();
}
if (ring) {
delete ring; ring = nullptr;
}
if (ring_semaphor) {
delete ring_semaphor; ring_semaphor = nullptr;
}
}
const char * Player::getName()
{
return "Player";
}
size_t Player::pull(float *buffer_ptr, size_t buffer_size)
{
size_t ret = ring->pull(buffer_ptr, buffer_size);
ring_semaphor->release(ret);
return ret;
}
size_t Player::push(float *buffer_ptr, size_t buffer_size)
{
size_t buffer_size_orig = buffer_size;
while (buffer_size > 0) {
// reduce buffer size if incoming buffer is bigger then 1/8 of the ring
size_t granula_size = buffer_size;
if (granula_size > ring_size/8) {
granula_size = ring_size/8;
}
// advance semaphor and push data into the buffer
ring_semaphor->acquire(granula_size);
ring->push(buffer_ptr, granula_size);
// adjust data pointer and size
buffer_size -= granula_size;
buffer_ptr += granula_size;
}
samples_elapsed += buffer_size_orig;
if (samples_elapsed > (_sample_rate * _channels / 8)) {
samples_elapsed = 0;
onProgressTimer();
}
return buffer_size_orig;
}
bool Player::startStream()
{
ca->start();
return true;
}
bool Player::stopStream()
{
ca->stop();
return true;
}
void Player::updateState(Player::State s)
{
qDebug() << this << "updateState(): state changed to" << s;
state = s;
emit stateUpdated(state);
}
void Player::ejectFile()
{
qDebug() << this << "ejectFile()";
if (file) {
file->cancelDecoding();
eject_future = QtConcurrent::run(
arfariusApp->getDecoderThreadPool(),
[this](){
av_sample_t *buffer = new av_sample_t[4096];
while (state != Player::PLAY && file) {
qDebug() << this << "ejectFile(): pumping samples";
pull(buffer, 4096);
}
delete [] buffer ;
}
);
file_future.waitForFinished();
eject_future.waitForFinished();
}
}
void Player::updateItem(PlayListItem *item)
{
qDebug() << this << "updateItem()" << item;
// skipping must suppress signals
if (file) {
quiet = true;
}
// set new item or stop
if (item) {
ejectFile();
file = item->getAVFile();
if (file == nullptr) {
emit trackEnded();
return;
}
file->setSamplerate(_sample_rate);
file->setChannels(_channels);
file->connectOutput(this);
file_future = QtConcurrent::run(
arfariusApp->getDecoderThreadPool(),
[this](){
file->decode();
delete file; file = 0;
if (quiet) {
quiet = false;
} else {
emit trackEnded();
}
}
);
if (state != Player::PLAY) {
startStream();
updateState(Player::PLAY);
}
} else {
stop();
}
}
void Player::seekToPercent(float p)
{
qDebug() << this << "seekTo()" << p;
if (file) file->seekToPercent(p);
}
void Player::seekForward(float seconds)
{
qDebug() << this << "seekForward" << seconds;
if (file) file->seekForward(seconds);
}
void Player::seekBackward(float seconds)
{
qDebug() << this << "seekBackward" << seconds;
if (file) file->seekBackward(seconds);
}
void Player::playPause()
{
qDebug() << this << "playPause()";
if (state == Player::PLAY) {
stopStream();
updateState(Player::PAUSE);
} else if (state == Player::PAUSE) {
startStream();
updateState(Player::PLAY);
} else {
startStream();
updateState(Player::PLAY);
if (!file) {
emit trackEnded();
}
}
}
void Player::stop()
{
qDebug() << this << "stop()";
if (state == Player::STOP)
return;
ejectFile();
stopStream();
// wipe buffer content and restore semaphor
ring->reset();
int e = ring_semaphor->available();
if (e < (int)ring_size) {
ring_semaphor->release(ring_size - e);
}
// emit all neccesery signals
updateState(Player::STOP);
emit timeComboUpdated("=(-_-)=");
emit progressUpdated(-1);
}
void Player::onProgressTimer()
{
float file_duration = file->getDurationInSeconds();
float file_samples = file->getDurationInSamples();
float file_position = file->getPositionInPercents();
float ring_offset = ring->readSpace()/_channels/file_samples;
float percent = file_position - ring_offset;
float position = percent * file_duration;
emit progressUpdated(percent);
emit timeComboUpdated(
formatTime(position) + " [" +
formatTime(file_duration) +"]"
);
}