1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
|
/* -*- 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);
}
|
