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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/***************************************************************************
* player.cc
*
* Tue Apr 15 10:34:18 CEST 2014
* Copyright 2014 Bent Bisballe Nyeng
* deva@aasimon.org
****************************************************************************/
/*
* This file is part of DrumGizmo.
*
* DrumGizmo is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* DrumGizmo 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with DrumGizmo; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
*/
#include "player.h"
#include <math.h>
#define BUFSZ 512
Player::Player()
{
peak = 0;
pos = 0;
gain_scalar = 1.0;
pcm_data = NULL;
pcm_size = 0;
end = 0;
new_selection = false;
connect(&report_timer, SIGNAL(timeout()), this, SLOT(reportTimeout()));
report_timer.start(50); // Update 25 times per second
start();
}
Player::~Player()
{
running = false; // Signal player thread to stop
wait(); // Wait for player thread to stop.
}
#define _MIN(a, b) (a<b?a:b)
void Player::run()
{
Selection sel;
ao_initialize();
ao_sample_format sf;
memset(&sf, 0, sizeof(sf));
sf.bits = 16;
sf.rate = 44100;
sf.channels = 1;
sf.byte_format = AO_FMT_NATIVE;
dev = ao_open_live(ao_default_driver_id(), &sf, 0);
running = true;
short s[BUFSZ];
while(running) {
{ // Check for new Selection.
QMutexLocker lock(&mutex);
if(new_selection) {
sel = selection;
pos = sel.from;
end = sel_end;
new_selection = false;
}
}
for(size_t i = 0; i < BUFSZ; i++) {
double sample = 0.0;
size_t p = i + pos;
if(p < sel.to && p < end && p < pcm_size) {
double fade = 1;
if(p < (sel.from + sel.fadein)) {
// Apply linear fade-in
double fp = (double)((int)p - (int)sel.from);
fade = fp / (double)sel.fadeout;
}
if(p > (sel.to - sel.fadeout)) {
// Apply linear fade-out
double fp = (double)(((int)sel.to - (int)sel.fadeout) - (int)p);
fade = 1 + (fp / (double)sel.fadeout);
}
sample = pcm_data[p] * fade * gain_scalar;
}
if(fabs(sample) > peak) {
peak = fabs(sample);
}
s[i] = _MIN(sample * SHRT_MAX, SHRT_MAX);
}
ao_play(dev, (char*)s, BUFSZ * sizeof(short));
pos += BUFSZ;
}
ao_close(dev);
ao_shutdown();
}
bool Player::playSelectionDone()
{
return pos >= sel_end || pos >= selection.to;
}
void Player::playSelection(Selection s, int len)
{
{ // Enqueue new Selection for player consumation
QMutexLocker lock(&mutex);
selection = s;
if(len > 0) sel_end = len;
else sel_end = selection.to - selection.from;
sel_end += selection.from;
new_selection = true;
}
// Wait until player actually consumed the new Selection.
while(new_selection) {
msleep(1);
}
}
void Player::setGainScalar(double g)
{
gain_scalar = g;
}
void Player::setGainDB(double gain_db)
{
setGainScalar(pow(10, gain_db/ 20.0));
}
void Player::reportTimeout()
{
emit peakUpdate(peak);
emit peakUpdateDB(20 * log10(peak));
peak = 0.0;
emit positionUpdate(pos);
peak = 0.0;
}
void Player::setPcmData(float *data, size_t size)
{
pcm_data = data;
pcm_size = size;
}
void Player::setPosition(size_t position)
{
Selection s;
s.from = position;
s.to = pcm_size;
s.fadein = 0;
s.fadeout = 0;
playSelection(s);
}
void Player::stop()
{
Selection s;
s.from = 0;
s.to = 0;
s.fadein = 0;
s.fadeout = 0;
playSelection(s, pos);
}
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