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
|
/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef ARDOUR_DSP_LOAD_CALCULATOR_H
#define ARDOUR_DSP_LOAD_CALCULATOR_H
#include <stdint.h>
#include <cassert>
#include <algorithm>
#include <pbd/ringbuffer.h>
#include "ardour/libardour_visibility.h"
namespace ARDOUR {
class LIBARDOUR_API DSPLoadCalculator {
public:
DSPLoadCalculator()
: m_max_time_us(0)
, m_start_timestamp_us(0)
, m_stop_timestamp_us(0)
, m_dsp_load(0)
, m_value_history (max_value_history())
, m_num_values(0)
{
}
void set_max_time_us(uint64_t max_time_us) {
assert(m_max_time_us != 0);
m_max_time_us = max_time_us;
// Use average of last 1/4 second of values so responsiveness
// remains consistent independent of max time
uint32_t max_dsp_samples_per_qtr_second = (250000 / m_max_time_us);
m_num_values =
std::min(max_value_history() - 1, max_dsp_samples_per_qtr_second);
m_value_history.reset();
}
uint64_t get_max_time_us() const { return m_max_time_us; }
void set_start_timestamp_us(uint64_t start_timestamp_us)
{
m_start_timestamp_us = start_timestamp_us;
}
void set_stop_timestamp_us(uint64_t stop_timestamp_us);
uint64_t elapsed_time_us()
{
return m_stop_timestamp_us - m_start_timestamp_us;
}
/**
* @return a decimal value between 0.0 and 1.0 representing the percentage
* of time spent between start and stop in proportion to the max expected time
* in microseconds(us).
*/
float get_dsp_load() const
{
if (m_dsp_load > m_max_time_us) {
return 1.0f;
}
if (m_dsp_load < 0.0f) {
return 0.0f;
}
return m_dsp_load;
}
private: // methods
static uint32_t max_value_history () { return 16; }
private: // data
uint64_t m_max_time_us;
uint64_t m_start_timestamp_us;
uint64_t m_stop_timestamp_us;
float m_dsp_load;
RingBuffer<float> m_value_history;
uint32_t m_num_values;
};
} // namespace ARDOUR
#endif // ARDOUR_DSP_LOAD_CALCULATOR_H
|
