sudo apt-get install libopenal-dev
will install OpenAL SDK and get you up and running ... alternatively if you want to compile from source ... the open source fork of openal lives at https://github.com/kcat/openal-soft (do a git log of the code once you do the git clone and you will see these two are source code mirrors )
install preliminary package to give you development tooling
sudo apt-get install build-essential
get current source :
# git clone git://repo.or.cz/openal-soft.git # both are same code
git clone [email protected]:kcat/openal-soft.git
cd openal-soft
cd build
cmake .. # get cmake using ... sudo apt-get install cmake
make
if no errors, then install :
sudo make install -j$(nproc)
totally feel free to post here any errors you encounter - ubuntu 12.04 or newer nicely offers apt-get install for all necessary libraries.
here are some optional upstream libs
sudo apt-get install libsdl-sound1.2-dev
sudo apt-get install libmyth-dev # may not be needed YMMV
now that you have needed libraries installed compile your coding using
gcc -o my_cool_openal_binary my_cool_code_openal.c -lopenal -lm
assuming your own source code file in the c language is called
my_cool_code_openal.c
execute your new binary
./my_cool_openal_binary
for completeness save below to a file called my_cool_code_openal.c then compile below code using above steps
// gcc -o openal_play_monday openal_play_monday.c -lopenal -lm
#include <stdio.h>
#include <stdlib.h> // gives malloc
#include <math.h>
#include <unistd.h> // gives sleep
#ifdef __APPLE__
#include <OpenAL/al.h>
#include <OpenAL/alc.h>
#elif __linux
#include <AL/al.h>
#include <AL/alc.h>
#endif
ALCdevice * openal_output_device;
ALCcontext * openal_output_context;
ALuint internal_buffer;
ALuint streaming_source[1];
int al_check_error(const char * given_label) {
ALenum al_error;
al_error = alGetError();
if(AL_NO_ERROR != al_error) {
printf("ERROR - %s (%s)\n", alGetString(al_error), given_label);
return al_error;
}
return 0;
}
void MM_init_al() {
const char * defname = alcGetString(NULL, ALC_DEFAULT_DEVICE_SPECIFIER);
openal_output_device = alcOpenDevice(defname);
openal_output_context = alcCreateContext(openal_output_device, NULL);
alcMakeContextCurrent(openal_output_context);
// setup buffer and source
alGenBuffers(1, & internal_buffer);
al_check_error("failed call to alGenBuffers");
}
void MM_exit_al() {
ALenum errorCode = 0;
// Stop the sources
alSourceStopv(1, & streaming_source[0]); // streaming_source
int ii;
for (ii = 0; ii < 1; ++ii) {
alSourcei(streaming_source[ii], AL_BUFFER, 0);
}
// Clean-up
alDeleteSources(1, &streaming_source[0]);
alDeleteBuffers(16, &streaming_source[0]);
errorCode = alGetError();
alcMakeContextCurrent(NULL);
errorCode = alGetError();
alcDestroyContext(openal_output_context);
alcCloseDevice(openal_output_device);
}
void MM_render_one_buffer() {
/* Fill buffer with Sine-Wave */
// float freq = 440.f;
float freq = 100.f;
float incr_freq = 0.1f;
int seconds = 4;
// unsigned sample_rate = 22050;
unsigned sample_rate = 44100;
double my_pi = 3.14159;
size_t buf_size = seconds * sample_rate;
// allocate PCM audio buffer
short * samples = malloc(sizeof(short) * buf_size);
printf("\nhere is freq %f\n", freq);
int i=0;
for(; i<buf_size; ++i) {
samples[i] = 32760 * sin( (2.f * my_pi * freq)/sample_rate * i );
freq += incr_freq;
// incr_freq += incr_freq;
// freq *= factor_freq;
if (100.0 > freq || freq > 5000.0) {
incr_freq *= -1.0f;
}
}
/* upload buffer to OpenAL */
alBufferData( internal_buffer, AL_FORMAT_MONO16, samples, buf_size, sample_rate);
al_check_error("populating alBufferData");
free(samples);
/* Set-up sound source and play buffer */
// ALuint src = 0;
// alGenSources(1, &src);
// alSourcei(src, AL_BUFFER, internal_buffer);
alGenSources(1, & streaming_source[0]);
alSourcei(streaming_source[0], AL_BUFFER, internal_buffer);
// alSourcePlay(src);
alSourcePlay(streaming_source[0]);
// ---------------------
ALenum current_playing_state;
alGetSourcei(streaming_source[0], AL_SOURCE_STATE, & current_playing_state);
al_check_error("alGetSourcei AL_SOURCE_STATE");
while (AL_PLAYING == current_playing_state) {
printf("still playing ... so sleep\n");
sleep(1); // should use a thread sleep NOT sleep() for a more responsive finish
alGetSourcei(streaming_source[0], AL_SOURCE_STATE, & current_playing_state);
al_check_error("alGetSourcei AL_SOURCE_STATE");
}
printf("end of playing\n");
/* Dealloc OpenAL */
MM_exit_al();
} // MM_render_one_buffer
int main() {
MM_init_al();
MM_render_one_buffer();
}
apt-get install libopenal-devwill install the package successfully, whileapt-get install openal-devwill get a message "unable to locate package openal-dev". – Occultism