Method alsaPcmHwParams

driver_unix.go:178–212

(sampleRate, channelCount int, bufferSize, periodSize *C.snd_pcm_uframes_t)

}

func (c *context) alsaPcmHwParams(sampleRate, channelCount int, bufferSize, periodSize *C.snd_pcm_uframes_t) error {
	var params *C.snd_pcm_hw_params_t
	C.snd_pcm_hw_params_malloc(&params)
	defer C.free(unsafe.Pointer(params))

	if err := C.snd_pcm_hw_params_any(c.handle, params); err < 0 {
		return alsaError("snd_pcm_hw_params_any", err)
	}
	if err := C.snd_pcm_hw_params_set_access(c.handle, params, C.SND_PCM_ACCESS_RW_INTERLEAVED); err < 0 {
		return alsaError("snd_pcm_hw_params_set_access", err)
	}
	if err := C.snd_pcm_hw_params_set_format(c.handle, params, C.SND_PCM_FORMAT_FLOAT_LE); err < 0 {
		return alsaError("snd_pcm_hw_params_set_format", err)
	}
	if err := C.snd_pcm_hw_params_set_channels(c.handle, params, C.unsigned(channelCount)); err < 0 {
		return alsaError("snd_pcm_hw_params_set_channels", err)
	}
	if err := C.snd_pcm_hw_params_set_rate_resample(c.handle, params, 1); err < 0 {
		return alsaError("snd_pcm_hw_params_set_rate_resample", err)
	}
	sr := C.unsigned(sampleRate)
	if err := C.snd_pcm_hw_params_set_rate_near(c.handle, params, &sr, nil); err < 0 {
		return alsaError("snd_pcm_hw_params_set_rate_near", err)
	}
	if err := C.snd_pcm_hw_params_set_buffer_size_near(c.handle, params, bufferSize); err < 0 {
		return alsaError("snd_pcm_hw_params_set_buffer_size_near", err)
	}
	if err := C.snd_pcm_hw_params_set_period_size_near(c.handle, params, periodSize, nil); err < 0 {
		return alsaError("snd_pcm_hw_params_set_period_size_near", err)
	}
	if err := C.snd_pcm_hw_params(c.handle, params); err < 0 {
		return alsaError("snd_pcm_hw_params", err)
	}
	return nil
}

func (c *context) readAndWrite(buf32 []float32) bool {
	c.cond.L.Lock()