1 // sample_openal.cxx -- Audio sample encapsulation class
3 // Written by Curtis Olson, started April 2004.
4 // Modified to match the new SoundSystem by Erik Hofman, October 2009
6 // Copyright (C) 2004 Curtis L. Olson - http://www.flightgear.org/~curt
7 // Copyright (C) 2009 Erik Hofman <erik@ehofman.com>
9 // This program is free software; you can redistribute it and/or
10 // modify it under the terms of the GNU General Public License as
11 // published by the Free Software Foundation; either version 2 of the
12 // License, or (at your option) any later version.
14 // This program is distributed in the hope that it will be useful, but
15 // WITHOUT ANY WARRANTY; without even the implied warranty of
16 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 // General Public License for more details.
19 // You should have received a copy of the GNU General Public License
20 // along with this program; if not, write to the Free Software Foundation,
21 // Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
26 # include <simgear_config.h>
29 #include <stdlib.h> // rand()
31 #include <simgear/debug/logstream.hxx>
32 #include <simgear/structure/exception.hxx>
33 #include <simgear/misc/sg_path.hxx>
34 #include <simgear/math/SGQuat.hxx>
36 #include "soundmgr_openal.hxx"
37 #include "sample_openal.hxx"
45 SGSoundSample::SGSoundSample() :
46 _absolute_pos(SGVec3d::zeros()),
47 _relative_pos(SGVec3d::zeros()),
48 _direction(SGVec3d::zeros()),
49 _velocity(SGVec3d::zeros()),
50 _orientation(SGQuatd::zeros()),
51 _orivec(SGVec3f::zeros()),
52 _base_pos(SGGeod::fromDeg(0,0)),
53 _refname(random_string()),
55 _format(AL_FORMAT_MONO8),
59 _buffer(SGSoundMgr::NO_BUFFER),
61 _source(SGSoundMgr::NO_SOURCE),
68 _reference_dist(500.0),
73 _static_changed(true),
79 SGSoundSample::SGSoundSample( const char *path, const char *file ) :
80 _absolute_pos(SGVec3d::zeros()),
81 _relative_pos(SGVec3d::zeros()),
82 _direction(SGVec3d::zeros()),
83 _velocity(SGVec3d::zeros()),
84 _orientation(SGQuatd::zeros()),
85 _orivec(SGVec3f::zeros()),
86 _base_pos(SGGeod::fromDeg(0,0)),
89 _format(AL_FORMAT_MONO8),
93 _buffer(SGSoundMgr::NO_BUFFER),
95 _source(SGSoundMgr::NO_SOURCE),
102 _reference_dist(500.0),
107 _static_changed(true),
110 SGPath samplepath( path );
111 if ( strlen(file) ) {
112 samplepath.append( file );
114 _refname = samplepath.str();
116 SG_LOG( SG_GENERAL, SG_DEBUG, "From file sounds sample = "
117 << samplepath.str() );
121 SGSoundSample::SGSoundSample( const unsigned char** data,
122 int len, int freq, int format ) :
123 _absolute_pos(SGVec3d::zeros()),
124 _relative_pos(SGVec3d::zeros()),
125 _direction(SGVec3d::zeros()),
126 _velocity(SGVec3d::zeros()),
127 _orientation(SGQuatd::zeros()),
128 _orivec(SGVec3f::zeros()),
129 _base_pos(SGGeod::fromDeg(0,0)),
130 _refname(random_string()),
134 _valid_buffer(false),
135 _buffer(SGSoundMgr::NO_BUFFER),
136 _valid_source(false),
137 _source(SGSoundMgr::NO_SOURCE),
144 _reference_dist(500.0),
149 _static_changed(true),
152 SG_LOG( SG_GENERAL, SG_DEBUG, "In memory sounds sample" );
153 _data = (unsigned char*)*data; *data = NULL;
157 SGSoundSample::SGSoundSample( void** data, int len, int freq, int format ) :
158 _absolute_pos(SGVec3d::zeros()),
159 _relative_pos(SGVec3d::zeros()),
160 _direction(SGVec3d::zeros()),
161 _velocity(SGVec3d::zeros()),
162 _orientation(SGQuatd::zeros()),
163 _orivec(SGVec3f::zeros()),
164 _base_pos(SGGeod::fromDeg(0,0)),
165 _refname(random_string()),
169 _valid_buffer(false),
170 _buffer(SGSoundMgr::NO_BUFFER),
171 _valid_source(false),
172 _source(SGSoundMgr::NO_SOURCE),
179 _reference_dist(500.0),
184 _static_changed(true),
187 SG_LOG( SG_GENERAL, SG_DEBUG, "In memory sounds sample" );
188 _data = (unsigned char*)*data; *data = NULL;
193 SGSoundSample::~SGSoundSample() {
194 if (_data) free( _data );
198 void SGSoundSample::update_absolute_position() {
199 // The rotation rotating from the earth centerd frame to
200 // the horizontal local frame
201 SGQuatd hlOr = SGQuatd::fromLonLat(_base_pos);
203 // Compute the sounds orientation and position
204 // wrt the earth centered frame - that is global coorinates
205 SGQuatd sc2body = _orientation*hlOr;
207 // This is rotates the x-forward, y-right, z-down coordinate system where
208 // simulation runs into the OpenGL camera system with x-right, y-up, z-back.
209 SGQuatd q(-0.5, -0.5, 0.5, 0.5);
211 // The cartesian position of the base sound coordinate
212 SGVec3d position = SGVec3d::fromGeod(_base_pos);
214 _absolute_pos = position + (sc2body*q).backTransform(_relative_pos);
215 _orivec = toVec3f( (sc2body*q).backTransform(_direction) );
218 string SGSoundSample::random_string() {
219 static const char *r = "0123456789abcdefghijklmnopqrstuvwxyz"
220 "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
222 for (int i=0; i<10; i++) {
223 rstr.push_back( r[rand() % strlen(r)] );