1 |
/*************************************************************************** |
2 |
* * |
3 |
* LinuxSampler - modular, streaming capable sampler * |
4 |
* * |
5 |
* Copyright (C) 2003, 2004 by Benno Senoner and Christian Schoenebeck * |
6 |
* * |
7 |
* This program is free software; you can redistribute it and/or modify * |
8 |
* it under the terms of the GNU General Public License as published by * |
9 |
* the Free Software Foundation; either version 2 of the License, or * |
10 |
* (at your option) any later version. * |
11 |
* * |
12 |
* This program is distributed in the hope that it will be useful, * |
13 |
* but WITHOUT ANY WARRANTY; without even the implied warranty of * |
14 |
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * |
15 |
* GNU General Public License for more details. * |
16 |
* * |
17 |
* You should have received a copy of the GNU General Public License * |
18 |
* along with this program; if not, write to the Free Software * |
19 |
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, * |
20 |
* MA 02111-1307 USA * |
21 |
***************************************************************************/ |
22 |
|
23 |
#include "Event.h" |
24 |
|
25 |
namespace LinuxSampler { |
26 |
|
27 |
/** |
28 |
* Create an EventGenerator. |
29 |
* |
30 |
* @param SampleRate - sample rate of the sampler engine's audio output |
31 |
* signal (in Hz) |
32 |
*/ |
33 |
EventGenerator::EventGenerator(uint SampleRate) { |
34 |
uiSampleRate = SampleRate; |
35 |
uiSamplesProcessed = 0; |
36 |
FragmentTime.end = RTMath::CreateTimeStamp(); |
37 |
} |
38 |
|
39 |
/** |
40 |
* Updates the time stamps for the beginning and end of the current audio |
41 |
* fragment. This is needed to be able to calculate the respective sample |
42 |
* point later to which an event belongs to. |
43 |
* |
44 |
* @param SamplesToProcess - number of sample points to process in this |
45 |
* audio fragment cycle |
46 |
*/ |
47 |
void EventGenerator::UpdateFragmentTime(uint SamplesToProcess) { |
48 |
// update time stamp for this audio fragment cycle |
49 |
FragmentTime.begin = FragmentTime.end; |
50 |
FragmentTime.end = RTMath::CreateTimeStamp(); |
51 |
// recalculate sample ratio for this audio fragment |
52 |
time_stamp_t fragmentDuration = FragmentTime.end - FragmentTime.begin; |
53 |
FragmentTime.sample_ratio = (float) uiSamplesProcessed / (float) fragmentDuration; |
54 |
// store amount of samples to process for the next cycle |
55 |
uiSamplesProcessed = SamplesToProcess; |
56 |
} |
57 |
|
58 |
/** |
59 |
* Create a new event with the current time as time stamp. |
60 |
*/ |
61 |
Event EventGenerator::CreateEvent() { |
62 |
return Event(this, RTMath::CreateTimeStamp()); |
63 |
} |
64 |
|
65 |
/** |
66 |
* Will be called by an EventGenerator to create a new Event. |
67 |
*/ |
68 |
Event::Event(EventGenerator* pGenerator, time_stamp_t Time) { |
69 |
pEventGenerator = pGenerator; |
70 |
TimeStamp = Time; |
71 |
iFragmentPos = -1; |
72 |
} |
73 |
|
74 |
} // namespace LinuxSampler |