1 // sample_openal.hxx -- 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 * \file audio sample.hxx
27 * Provides a audio sample encapsulation
30 #ifndef _SG_SAMPLE_HXX
31 #define _SG_SAMPLE_HXX 1
34 # error This library requires C++
40 #include <simgear/compiler.h>
41 #include <simgear/debug/logstream.hxx>
42 #include <simgear/structure/SGReferenced.hxx>
43 #include <simgear/structure/SGSharedPtr.hxx>
44 #include <simgear/math/SGMath.hxx>
49 * manages everything we need to know for an individual audio sample
52 class SGSoundSample : public SGReferenced {
56 * Empty constructor, can be used to read data to the systems
57 * memory and not to the driver.
63 * @param path Path name to sound
64 * @param file File name of sound
65 Buffer data is freed by the sample group
67 SGSoundSample( const char *path, const char *file );
71 * @param data Pointer to a memory buffer containing this audio sample data
72 The application may free the data by calling free_data(), otherwise it
73 will be resident untill the class is destroyed. This pointer will be
74 set to NULL after calling this function.
75 * @param len Byte length of array
76 * @param freq Frequency of the provided data (bytes per second)
77 * @param format OpenAL format id of the data
79 SGSoundSample( void** data, int len, int freq, int format=AL_FORMAT_MONO8 );
80 SGSoundSample( const unsigned char** data, int len, int freq,
81 int format = AL_FORMAT_MONO8 );
89 * Detect wheter this audio sample holds the information of a sound file.
90 * @return Return true if this audio sample is to be constructed from a file.
92 inline bool is_file() const { return _is_file; }
94 SGPath file_path() const;
97 * Test if this audio sample configuration has changed since the last call.
98 * Calling this function will reset the flag so calling it a second
99 * time in a row will return false.
100 * @return Return true is the configuration has changed in the mean time.
103 bool b = _changed; _changed = false; return b;
107 * Test if static dataa of audio sample configuration has changed.
108 * Calling this function will reset the flag so calling it a second
109 * time in a row will return false.
110 * @return Return true is the static data has changed in the mean time.
112 bool has_static_data_changed() {
113 bool b = _static_changed; _static_changed = false; return b;
117 * Schedule this audio sample for playing. Actual playing will only start
118 * at the next call op SoundGroup::update()
119 * @param _loop Define whether this sound should be played in a loop.
121 void play( bool loop = false ) {
122 _playing = true; _loop = loop; _changed = true;
126 * Check if this audio sample is set to be continuous looping.
127 * @return Return true if this audio sample is set to looping.
129 inline bool is_looping() { return _loop; }
132 * Schedule this audio sample to stop playing.
134 virtual void stop() {
135 _playing = false; _changed = true;
139 * Schedule this audio sample to play once.
142 inline void play_once() { play(false); }
145 * Schedule this audio sample to play looped.
148 inline void play_looped() { play(true); }
151 * Test if a audio sample is scheduled for playing.
152 * @return true if this audio sample is playing, false otherwise.
154 inline bool is_playing() { return _playing; }
157 * Set the data associated with this audio sample
158 * @param data Pointer to a memory block containg this audio sample data.
159 This pointer will be set to NULL after calling this function.
161 inline void set_data( const unsigned char **data ) {
162 _data = (unsigned char*)*data; *data = NULL;
164 inline void set_data( const void **data ) {
165 _data = (unsigned char*)*data; *data = NULL;
169 * Return the data associated with this audio sample.
170 * @return A pointer to this sound data of this audio sample.
172 inline void* get_data() const { return _data; }
175 * Free the data associated with this audio sample
178 if ( _data != NULL ) free( _data ); _data = NULL;
182 * Set the source id of this source
183 * @param sid OpenAL source-id
185 virtual inline void set_source(unsigned int sid) {
186 _source = sid; _valid_source = true; _changed = true;
190 * Get the OpenAL source id of this source
191 * @return OpenAL source-id
193 virtual inline unsigned int get_source() { return _source; }
196 * Test if the source-id of this audio sample may be passed to OpenAL.
197 * @return true if the source-id is valid
199 virtual inline bool is_valid_source() const { return _valid_source; }
202 * Set the source-id of this audio sample to invalid.
204 virtual inline void no_valid_source() { _valid_source = false; }
207 * Set the OpenAL buffer-id of this source
208 * @param bid OpenAL buffer-id
210 inline void set_buffer(unsigned int bid) {
211 _buffer = bid; _valid_buffer = true; _changed = true;
215 * Get the OpenAL buffer-id of this source
216 * @return OpenAL buffer-id
218 inline unsigned int get_buffer() { return _buffer; }
221 * Test if the buffer-id of this audio sample may be passed to OpenAL.
222 * @return true if the buffer-id is valid
224 inline bool is_valid_buffer() const { return _valid_buffer; }
227 * Set the buffer-id of this audio sample to invalid.
229 inline void no_valid_buffer() { _valid_buffer = false; }
232 * Set the playback pitch of this audio sample.
233 * Should be between 0.0 and 2.0 for maximum compatibility.
236 inline void set_pitch( float p ) {
237 if (p > 2.0) p = 2.0; else if (p < 0.01) p = 0.01;
238 _pitch = p; _changed = true;
242 * Get the current pitch value of this audio sample.
245 inline float get_pitch() { return _pitch; }
248 * Set the master volume of this sample. Should be between 0.0 and 1.0.
249 * The final volume is calculated by multiplying the master and audio sample
253 inline void set_master_volume( float v ) {
254 if (v > 1.0) v = 1.0; else if (v < 0.0) v = 0.0;
255 _master_volume = v; _changed = true;
259 * Set the volume of this audio sample. Should be between 0.0 and 1.0.
260 * The final volume is calculated by multiplying the master and audio sample
264 inline void set_volume( float v ) {
265 if (v > 1.0) v = 1.0; else if (v < 0.0) v = 0.0;
266 _volume = v; _changed = true;
270 * Get the final volume value of this audio sample.
273 inline float get_volume() { return _volume * _master_volume; }
276 * Set the OpenAL format of this audio sample.
277 * @param format OpenAL format-id
279 inline void set_format( int format ) { _format = format; }
282 * Returns the format of this audio sample.
283 * @return OpenAL format-id
285 inline int get_format() { return _format; }
288 * Set the frequency (in Herz) of this audio sample.
289 * @param freq Frequency
291 inline void set_frequency( int freq ) { _freq = freq; }
294 * Returns the frequency (in Herz) of this audio sample.
297 inline int get_frequency() { return _freq; }
300 * Sets the size (in bytes) of this audio sample.
301 * @param size Data size
303 inline void set_size( size_t size ) { _size = size; }
306 * Returns the size (in bytes) of this audio sample.
309 inline size_t get_size() const { return _size; }
312 * Set the position of this sound relative to the base position.
313 * This is in the same coordinate system as OpenGL; y=up, z=back, x=right.
314 * @param pos Relative position of this sound
316 inline void set_relative_position( const SGVec3f& pos ) {
317 _relative_pos = toVec3d(pos); _changed = true;
321 * Set the base position in Cartesian coordinates
322 * @param pos position in Cartesian coordinates
324 inline void set_position( const SGVec3d& pos ) {
325 _base_pos = pos; _changed = true;
329 * Get the absolute position of this sound.
330 * This is in the same coordinate system as OpenGL; y=up, z=back, x=right.
331 * @return Absolute position
333 SGVec3d& get_position() { return _absolute_pos; }
336 * Set the orientation of this sound.
337 * @param ori Quaternation containing the orientation information
339 inline void set_orientation( const SGQuatd& ori ) {
340 _orientation = ori; _changed = true;
343 inline void set_rotation( const SGQuatd& ec2body ) {
344 _rotation = ec2body; _changed = true;
348 * Set direction of this sound relative to the orientation.
349 * This is in the same coordinate system as OpenGL; y=up, z=back, x=right
350 * @param dir Sound emission direction
352 inline void set_direction( const SGVec3f& dir ) {
353 _direction = toVec3d(dir); _static_changed = true;
357 * Define the audio cone parameters for directional audio.
358 * Note: setting it to 2 degree will result in 1 degree to both sides.
359 * @param inner Inner cone angle (0 - 360 degrees)
360 * @param outer Outer cone angle (0 - 360 degrees)
361 * @param gain Remaining gain at the edge of the outer cone (0.0 - 1.0)
363 void set_audio_cone( float inner, float outer, float gain ) {
364 _inner_angle = inner; _outer_angle = outer; _outer_gain = gain;
365 _static_changed = true;
369 * Get the orientation vector of this sound.
370 * This is in the same coordinate system as OpenGL; y=up, z=back, x=right
371 * @return Orientaton vector
373 SGVec3f& get_orientation() { return _orivec; }
376 * Get the inner angle of the audio cone.
377 * @return Inner angle in degrees
379 float get_innerangle() { return _inner_angle; }
382 * Get the outer angle of the audio cone.
383 * @return Outer angle in degrees
385 float get_outerangle() { return _outer_angle; }
388 * Get the remaining gain at the edge of the outer cone.
391 float get_outergain() { return _outer_gain; }
394 * Set the velocity vector (in meters per second) of this sound.
395 * This is in the local frame coordinate system; x=north, y=east, z=down
396 * @param Velocity vector
398 inline void set_velocity( const SGVec3f& vel ) {
399 _velocity = vel; _changed = true;
403 * Get velocity vector (in meters per second) of this sound.
404 * This is in the same coordinate system as OpenGL; y=up, z=back, x=right
405 * @return Velocity vector
407 SGVec3f& get_velocity() { return _velocity; }
411 * Set reference distance (in meters) of this sound.
412 * This is the distance where the gain will be half.
413 * @param dist Reference distance
415 inline void set_reference_dist( float dist ) {
416 _reference_dist = dist; _static_changed = true;
420 * Get reference distance ((in meters) of this sound.
421 * This is the distance where the gain will be half.
422 * @return Reference distance
424 inline float get_reference_dist() { return _reference_dist; }
428 * Set maximum distance (in meters) of this sound.
429 * This is the distance where this sound is no longer audible.
430 * @param dist Maximum distance
432 inline void set_max_dist( float dist ) {
433 _max_dist = dist; _static_changed = true;
437 * Get maximum distance (in meters) of this sound.
438 * This is the distance where this sound is no longer audible.
439 * @return dist Maximum distance
441 inline float get_max_dist() { return _max_dist; }
444 * Get the reference name of this audio sample.
445 * @return Sample name
447 inline std::string get_sample_name() const { return _refname; }
449 inline virtual bool is_queue() const { return false; }
451 void update_pos_and_orientation();
455 // Position of the source sound.
456 SGVec3d _absolute_pos; // absolute position
457 SGVec3d _relative_pos; // position relative to the base position
458 SGVec3d _direction; // orientation offset
459 SGVec3f _velocity; // Velocity of the source sound.
461 // The position and orientation of this sound
462 SGQuatd _orientation; // base orientation
463 SGVec3f _orivec; // orientation vector for OpenAL
464 SGVec3d _base_pos; // base position
468 std::string _refname; // name or file path
469 unsigned char* _data;
471 // configuration values
476 // Buffers hold sound data.
478 unsigned int _buffer;
480 // Sources are points emitting sound.
482 unsigned int _source;
484 // The orientation of this sound (direction and cut-off angles)
491 float _master_volume;
492 float _reference_dist;
498 bool _static_changed;
501 string random_string();
505 #endif // _SG_SAMPLE_HXX