1 files changed, 190 insertions, 0 deletions
diff --git a/src/player.cc b/src/player.cc
new file mode 100644
index 0000000..3a2bfd2
--- /dev/null
+++ b/src/player.cc
@@ -0,0 +1,190 @@
+/* -*- 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);
+}