1 // _samplequeue.cxx -- Sound effect management class implementation
2 //
3 // Started by David Megginson, October 2001
4 // (Reuses some code from main.cxx, probably by Curtis Olson)
5 //
6 // Copyright (C) 2001 Curtis L. Olson - http://www.flightgear.org/~curt
7 //
8 // This program is free software; you can redistribute it and/or
9 // modify it under the terms of the GNU General Public License as
10 // published by the Free Software Foundation; either version 2 of the
11 // License, or (at your option) any later version.
12 //
13 // This program is distributed in the hope that it will be useful, but
14 // WITHOUT ANY WARRANTY; without even the implied warranty of
15 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 // General Public License for more details.
17 //
18 // You should have received a copy of the GNU General Public License
19 // along with this program; if not, write to the Free Software
20 // Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
21 //
22 // $Id$
23
24 #ifdef _MSC_VER
25 #pragma warning (disable: 4786)
26 #endif
27
28 #ifdef HAVE_CONFIG_H
29 # include <config.h>
30 #endif
31
32 #include "sample_queue.hxx"
33
34 #include <Main/fg_props.hxx>
35
36 #include <simgear/sound/soundmgr.hxx>
37 #include <simgear/sound/sample.hxx>
38
FGSampleQueue(SGSoundMgr * smgr,const std::string & refname)39 FGSampleQueue::FGSampleQueue ( SGSoundMgr *smgr, const std::string &refname ) :
40 last_enabled( true ),
41 last_volume( 0.0 ),
42 _enabled( fgGetNode("/sim/sound/"+refname+"/enabled", true) ),
43 _volume( fgGetNode("/sim/sound/"+refname+"/volume", true) )
44 {
45 SGSampleGroup::_smgr = smgr;
46 SGSampleGroup::_smgr->add(this, refname);
47 SGSampleGroup::_refname = refname;
48 }
49
50
~FGSampleQueue()51 FGSampleQueue::~FGSampleQueue ()
52 {
53 }
54
55
56 void
update(double dt)57 FGSampleQueue::update (double dt)
58 {
59 // command sound manger
60 bool new_enabled = _enabled->getBoolValue();
61 if ( new_enabled != last_enabled ) {
62 if ( new_enabled ) {
63 resume();
64 } else {
65 suspend();
66 }
67 last_enabled = new_enabled;
68 }
69
70 if ( new_enabled ) {
71 double volume = _volume->getDoubleValue();
72 if ( volume != last_volume ) {
73 set_volume( volume );
74 last_volume = volume;
75 }
76
77 // process message queue
78 const std::string msgid = "Sequential Audio Message";
79 bool now_playing = false;
80 if ( exists( msgid ) ) {
81 now_playing = is_playing( msgid );
82 if ( !now_playing ) {
83 // current message finished, stop and remove
84 stop( msgid ); // removes source
85 remove( msgid ); // removes buffer
86 }
87 }
88
89 if ( !now_playing ) {
90 // message queue idle, add next sound if we have one
91 if ( ! _messages.empty() ) {
92 SGSampleGroup::add( _messages.front(), msgid );
93 _messages.pop();
94 play_once( msgid );
95 }
96 }
97
98 SGSampleGroup::update(dt);
99 }
100 }
101
102 // end of _samplequeue.cxx
103