Method run

sources/sound-capture/linux/SoundCaptureLinux.cpp:122–279

}

void AlsaWorkerThread::run(){
	snd_pcm_sframes_t workingSizeSample = (1 << SOUNDCAPLINUX_BUF_LENP);
	snd_pcm_uframes_t periodSize = workingSizeSample;
	snd_pcm_uframes_t bufferSizeInBytes = periodSize * 2;
	bool			initialMessage = false;
	snd_pcm_t*		handle;
	int				status = 0;
	bool    		error = false;
	unsigned int 	exactRate = 22050;

	if (!initAlsaLib())
		return;

	if ((status = this->snd_pcm_open(&handle, QSTRING_CSTR(_device), SND_PCM_STREAM_CAPTURE, 0)) < 0) {
		Error(_logger, "Cannot open input sound device '%s'. Error: '%s'", QSTRING_CSTR(_device), this->snd_strerror(status));

		// clean-up
		closeAlsaLib();
		return;
	}

	snd_pcm_hw_params_t* selected_hw_params = nullptr;

	if ((status = this->snd_pcm_hw_params_malloc(&selected_hw_params)) < 0) {
		Error(_logger, "Cannot allocate hardware parameter buffer: '%s'", this->snd_strerror(status));
		this->snd_pcm_close(handle);

		// clean-up
		closeAlsaLib();
		return;
	}

	try
	{
		if ((status = this->snd_pcm_hw_params_any(handle, selected_hw_params)) < 0) {
			Error(_logger, "Cannot set snd_pcm_hw_params_any: '%s'", this->snd_strerror(status));
			throw 1;
		}

		if ((status = this->snd_pcm_hw_params_set_access(handle, selected_hw_params, SND_PCM_ACCESS_RW_INTERLEAVED)) < 0) {
			Error(_logger, "Cannot set snd_pcm_hw_params_set_access: '%s'", this->snd_strerror(status));
			throw 2;
		}

		if ((status = this->snd_pcm_hw_params_set_format(handle, selected_hw_params, SND_PCM_FORMAT_S16_LE)) < 0) {
			Error(_logger, "Cannot set snd_pcm_hw_params_set_format: '%s'", this->snd_strerror(status));
			throw 3;
		}

		if ((status = this->snd_pcm_hw_params_set_rate_near(handle, selected_hw_params, &exactRate, 0)) < 0) {
			Error(_logger, "Cannot set snd_pcm_hw_params_set_rate_near: '%s'", this->snd_strerror(status));
			throw 4;
		}
		else if (exactRate != 22050)
		{
			Error(_logger, "Cannot set rate to 22050");
			throw 5;
		}