Me sorprendió mucho ver que se puede programar OpenAl desde PHP.
En el manual de PHP capitulo “Audio Formats Manipulation” explica de forma muy clara como llamar los métodos necesarios para inicializar un dispositivo, crear buffers, ejecutarlos, etc...
El siguiente es un ejemplo de cómo acceder OpenAL desde PHP, el mismo fue obtenido de un comentario en la documentación del sitio del lenguaje.
Playing a wav file:
function printok($b) {
echo $b ? " ok\n" : " error\n";
}
echo "Opening device";
$device = openal_device_open();
printok($device);
echo "Creating context";
$context = openal_context_create($device);
printok($context);
echo "Making context the current";
printok(openal_context_current($context));
//where we are
//echo "Setting listener position";
//printok(openal_listener_set(AL_POSITION, array(0, 0, 0)));
//echo "Setting listener orientation";
//printok(openal_listener_set(AL_ORIENTATION, array(0=>0,1 => 1, 2=>0, 3=> 0, 4=>4, 5=>5)));
echo "Creating buffer";
$buffer = openal_buffer_create();
echo "Loading wav";
printok(openal_buffer_loadwav($buffer, '/data/shared/vmware/newmessage.wav'));
echo "buffer stats\n";
echo " Frequency: " . openal_buffer_get($buffer, AL_FREQUENCY) . "\n";
echo " Bits : " . openal_buffer_get($buffer, AL_BITS) . "\n";
echo " Channels : " . openal_buffer_get($buffer, AL_CHANNELS) . "\n";
echo " Size : " . openal_buffer_get($buffer, AL_SIZE) . "\n";
echo "Creating source";
$source = openal_source_create();
echo "Setting source buffer";
printok(openal_source_set($source, AL_BUFFER, $buffer));
//echo "Setting source position";
//printok(openal_source_set($source, AL_POSITION, array(1, 0, 0)));
echo "Playing source";
printok(openal_source_play($source));
echo "sleeping\n";
//sleep(1);
//we wait 300msecs beause the sound
// has no time to be played otherwise
//since playing sound is done concurrently
// to the script
usleep(300000);
echo "Destroying source";
printok(openal_source_destroy($source));
echo "Destroying buffer";
printok(openal_buffer_destroy($buffer));
echo "Destroying context";
printok(openal_context_destroy($context));
echo "Closing device";
printok(openal_device_close($device));
?>
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