Method GetMixerOutput

extensions/olcPGEX_Sound.h:377–426

	}

	float SOUND::GetMixerOutput(int nChannel, float fGlobalTime, float fTimeStep)
	{
		// Accumulate sample for this channel
		float fMixerSample = 0.0f;

		for (auto &s : listActiveSamples)
		{
			if (m_bAudioThreadActive)
			{
				if (s.bFlagForStop)
				{
					s.bLoop = false;
					s.bFinished = true;
				}
				else
				{
					// Calculate sample position
					s.nSamplePosition += roundf((float)vecAudioSamples[s.nAudioSampleID - 1].wavHeader.nSamplesPerSec * fTimeStep);

					// If sample position is valid add to the mix
					if (s.nSamplePosition < vecAudioSamples[s.nAudioSampleID - 1].nSamples)
						fMixerSample += vecAudioSamples[s.nAudioSampleID - 1].fSample[(s.nSamplePosition * vecAudioSamples[s.nAudioSampleID - 1].nChannels) + nChannel];
					else
					{
						if (s.bLoop)
						{
							s.nSamplePosition = 0;
						}
						else
							s.bFinished = true; // Else sound has completed
					}
				}
			}
			else
				return 0.0f;
		}

		// If sounds have completed then remove them
		listActiveSamples.remove_if([](const sCurrentlyPlayingSample &s) {return s.bFinished; });

		// The users application might be generating sound, so grab that if it exists
		if (funcUserSynth != nullptr)
			fMixerSample += funcUserSynth(nChannel, fGlobalTime, fTimeStep);

		// Return the sample via an optional user override to filter the sound
		if (funcUserFilter != nullptr)
			return funcUserFilter(nChannel, fGlobalTime, fMixerSample);
		else
			return fMixerSample;
	}

	std::thread SOUND::m_AudioThread;
	std::atomic<bool> SOUND::m_bAudioThreadActive{ false };