Ошибка «Неверное имя» функции alDeleteBuffers

В этой программе функция alDeleteBuffers производит Invalid Name ошибка через несколько секунд:

#include <stdio.h>
#include <math.h>#ifdef __APPLE__
#include <OpenAL/al.h>
#include <OpenAL/alc.h>
#elif __linux
#include <AL/al.h>
#include <AL/alut.h>
#include <AL/alc.h>
#endif#include <iostream>
#include <thread>
using namespace std;class Sound
{
public:
ALCdevice* openal_output_device;
ALCcontext* openal_output_context;int al_check_error(const char * given_label)
{
ALenum al_error = alGetError();

if(al_error != AL_NO_ERROR)
{
printf("ERROR - %s  (%s)\n", alGetString(al_error), given_label);
return al_error;
}
return 0;
}

void StartAl()
{
const char* defname = alcGetString(0,ALC_DEFAULT_DEVICE_SPECIFIER);
openal_output_device  = alcOpenDevice(defname);
openal_output_context = alcCreateContext(openal_output_device,0);
alcMakeContextCurrent(openal_output_context);
}

void EndAl()
{
alcMakeContextCurrent(0);
al_check_error("EndAl1");
alcDestroyContext(openal_output_context);
al_check_error("EndAl2");
alcCloseDevice(openal_output_device);
al_check_error("EndAl3");
}

void Beep(float frequency, float seconds)
{
seconds *= 2;

ALuint internal_buffer;
ALuint streaming_source[1];

alGenBuffers(1,&internal_buffer);
al_check_error("failed call to alGenBuffers");

/* Fill buffer with Sine-Wave */
unsigned sample_rate = 10000;

size_t buf_size = seconds*sample_rate;

// allocate PCM audio buffer
short* samples = new short[buf_size];

for(int i = 0; i < buf_size; i++)
samples[i] = 32760*sin(2*M_PI*i*frequency/sample_rate);/* upload buffer to OpenAL */
alBufferData(internal_buffer, AL_FORMAT_MONO16, samples, buf_size, sample_rate);
al_check_error("alBufferData Failed");

delete[] samples;//free(samples);

/* Set-up sound source and play buffer */

alGenSources(1,&streaming_source[0]);
alSourcei(streaming_source[0], AL_BUFFER, internal_buffer);
alSourcePlay(streaming_source[0]);ALenum current_playing_state;
alGetSourcei(streaming_source[0],AL_SOURCE_STATE,&current_playing_state);
al_check_error("alGetSourcei Failed");

alutSleep(seconds);
while(current_playing_state == AL_PLAYING)
{
alGetSourcei(streaming_source[0], AL_SOURCE_STATE, &current_playing_state);
if(al_check_error("alGetSourcei in while loop") != 0)
break;
alutSleep(0.1);
}

alSourceStopv(1,&streaming_source[0]);
al_check_error("alSourceStopv");
alSourcei(streaming_source[0],AL_BUFFER,0);
al_check_error("alSourcei");
alDeleteSources(1,&streaming_source[0]);
al_check_error("alDeleteSources");

alDeleteBuffers(16,&streaming_source[0]); // HERE HERE HERE HERE
al_check_error("alDeleteBuffers");
}

Sound()
{
StartAl();
}
~Sound()
{
EndAl();
}
};void Beep(float frequency = 440, float seconds = 1)
{
static Sound s;
s.Beep(frequency,seconds);
}int main()
{
for(int i = 0; i < 1000; i++)
{
thread t(Beep, 840,0.5);
t.detach();
alutSleep(0.01);
cout<< i << "\n";
}
cin.get();
}

Также все функции OpenAl в EndAl метод производства (null) ошибка.

Почему это происходит и есть ли способ это исправить?

Линия

alDeleteBuffers(16,&streaming_source[0]);

Нужно ли освободить буферы и память забрать?