Function picoAudioCallback

modules/pins/i2s/audioout.c:1756–1794

#elif PICO_BUILD
static void picoAudioCallback(modTimer timer, void *refcon, int refconSize)
{
	modAudioOut out = *(modAudioOut*)refcon;

	static int i2s_enabled = 0;

	if (!i2s_enabled) {
modLog(" - enable i2s ");
		audio_i2s_set_enabled(true);
		i2s_enabled = 1;
	}

	if (out->state == kStatePlaying) {
		int j;
		for (j=0; j<3; j++) {
			struct audio_buffer *buffer = take_audio_buffer(out->ap, false);
			if (!buffer) {
//				modLog("no buffer");
				break;
			}
			int16_t *samples = (int16_t*)buffer->buffer->bytes;
			audioMix(out, buffer->max_sample_count, samples);
			buffer->sample_count = buffer->max_sample_count;
			give_audio_buffer(out->ap, buffer);
		}
	}
	else if (out->state == kStateIdle) {
	}
	else if (out->state == kStateClosing) {
		modLog("audio closing");

		audio_i2s_set_enabled(false);
		i2s_enabled = 0;
		modTimerRemove(out->timer);
		out->timer = NULL;
		out->state = kStateTerminated;
	}

}
#endif

#if PICO_BUILD || defined(__ets__) || ESP32 || defined(_WIN32)