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authorBent Bisballe Nyeng <deva@aasimon.org>2014-09-08 20:48:38 +0200
committerBent Bisballe Nyeng <deva@aasimon.org>2014-09-08 20:48:38 +0200
commit7776aa97fc1c69a8f28ba4bab7387fb96be9a6e4 (patch)
tree8e23cfbfe7e93bdfad4421ccb0ec8c280a0b43ed /src/player.cc
parent56f5965ffa2538dfa482ae9460e9579b4a04f8fb (diff)
Import dgedit from drumgizmo repository (split into its own project).
Diffstat (limited to 'src/player.cc')
-rw-r--r--src/player.cc190
1 files changed, 190 insertions, 0 deletions
diff --git a/src/player.cc b/src/player.cc
new file mode 100644
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+++ b/src/player.cc
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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);
+}