Fading between audio-channels

Hello!

I want to fade between two audio channels. First, a sound is applied to the first channel. Then, when a second sound is attached, the first channel should fade out, and the other fade in. Then, it might be, that another sound is added. In this case channel 2 should fade out, and channel 1 should fade in (and so on).

Here is a code snipped that I produced:

Code:

// Membervariables
FMOD::Channel * m_pSoundChannel, *m_pSoundChannel2;
FMOD::Sound* m_CurSound;
float m_SoundOrgFrequ;
float m_SoundCurSampleSpeed;
int m_fadeInOut[2];
bool m_fadeInFirstChannel;
std::vector<FMOD::Sound*> m_sounds;

	while (...)
	{
		//...

		// fade
		if (m_fadeInFirstChannel && m_fadeInOut[0] < 256)
		{
			// fade in channel 1
			m_fadeInOut[0]++;

			if (m_fadeInOut[1] > 0) m_fadeInOut[1]--;
			else if (m_pSoundChannel2)
			{
				CSoundManager::ERRCHECK(m_pSoundChannel2->stop());
				m_pSoundChannel2 = 0;
			}
		}
		else if (m_fadeInOut[1] < 256 && !m_fadeInFirstChannel)
		{
			m_fadeInOut[1]++;
			if (m_fadeInOut[0] > 0) m_fadeInOut[0]--;
			else if (m_pSoundChannel) 
			{
				CSoundManager::ERRCHECK(m_pSoundChannel->stop());
				m_pSoundChannel = 0;
			}
		}

		// Loading of soundfiles
		if (m_the_car.rpm < 2000 && m_CurSound != m_sounds[0])
		{

			CSoundManager::PlaySound(m_sounds[0],false,m_fadeInFirstChannel ? &m_pSoundChannel : &m_pSoundChannel2);
			CSoundManager::ERRCHECK((m_fadeInFirstChannel ? m_pSoundChannel : m_pSoundChannel2)->getFrequency(&m_SoundOrgFrequ));

			m_fadeInFirstChannel = !m_fadeInFirstChannel;

			m_CurSound = m_sounds[0];
		}
		else if (m_the_car.rpm >= 2000 && m_the_car.rpm < 3000 && m_CurSound != m_sounds[1])
		{
			CSoundManager::PlaySound(m_sounds[1],false,m_fadeInFirstChannel ? &m_pSoundChannel : &m_pSoundChannel2);
			CSoundManager::ERRCHECK((m_fadeInFirstChannel ? m_pSoundChannel : m_pSoundChannel2)->getFrequency(&m_SoundOrgFrequ));

			m_fadeInFirstChannel = !m_fadeInFirstChannel;
			m_CurSound = m_sounds[1];
		}

		if (m_pSoundChannel) 
		{
			m_pSoundChannel->setVolume(m_fadeInOut[0]);
		}
		if (m_pSoundChannel2) 
		{
			m_pSoundChannel2->setVolume(m_fadeInOut[1]);
		}


	} // while

Somewhere is an error, but I don't get it. Can someone please help me?

thank you,

It would be nicer to have some concrete error messages or behaviors to go through that piece of code, if that's possible.

Cheers

Originally Posted by LinuxCoder

It would be nicer to have some concrete error messages or behaviors to go through that piece of code, if that's possible.

Cheers

ok. at the beginning there aren't any errors but sounds do not stop (so there is just noise, because sounds are added to each other).