/*************************************************************************/
/*  audio_driver_media_kit.cpp                                           */
/*************************************************************************/
/*                       This file is part of:                           */
/*                           GODOT ENGINE                                */
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/* Copyright (c) 2007-2020 Juan Linietsky, Ariel Manzur.                 */
/* Copyright (c) 2014-2020 Godot Engine contributors (cf. AUTHORS.md).   */
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#include "audio_driver_media_kit.h"

#ifdef MEDIA_KIT_ENABLED

#include "core/project_settings.h"

int32_t *AudioDriverMediaKit::samples_in = nullptr;

Error AudioDriverMediaKit::init() {
	active = false;

	mix_rate = GLOBAL_GET("audio/mix_rate");
	speaker_mode = SPEAKER_MODE_STEREO;
	channels = 2;

	int latency = GLOBAL_GET("audio/output_latency");
	buffer_size = next_power_of_2(latency * mix_rate / 1000);
	samples_in = memnew_arr(int32_t, buffer_size * channels);

	media_raw_audio_format format;
	format = media_raw_audio_format::wildcard;
	format.frame_rate = mix_rate;
	format.channel_count = channels;
	format.format = media_raw_audio_format::B_AUDIO_INT;
	format.byte_order = B_MEDIA_LITTLE_ENDIAN;
	format.buffer_size = buffer_size * sizeof(int32_t) * channels;

	player = new BSoundPlayer(
			&format,
			"godot_sound_server",
			AudioDriverMediaKit::PlayBuffer,
			nullptr,
			this);

	if (player->InitCheck() != B_OK) {
		fprintf(stderr, "MediaKit ERR: can not create a BSoundPlayer instance\n");
		ERR_FAIL_COND_V(player == nullptr, ERR_CANT_OPEN);
	}

	player->Start();

	return OK;
}

void AudioDriverMediaKit::PlayBuffer(void *cookie, void *buffer, size_t size, const media_raw_audio_format &format) {
	AudioDriverMediaKit *ad = (AudioDriverMediaKit *)cookie;
	int32_t *buf = (int32_t *)buffer;

	if (!ad->active) {
		for (unsigned int i = 0; i < ad->buffer_size * ad->channels; i++) {
			AudioDriverMediaKit::samples_in[i] = 0;
		}
	} else {
		ad->lock();
		ad->audio_server_process(ad->buffer_size, AudioDriverMediaKit::samples_in);
		ad->unlock();
	}

	for (unsigned int i = 0; i < ad->buffer_size * ad->channels; i++) {
		buf[i] = AudioDriverMediaKit::samples_in[i];
	}
}

void AudioDriverMediaKit::start() {
	active = true;
}

int AudioDriverMediaKit::get_mix_rate() const {
	return mix_rate;
}

AudioDriverMediaKit::SpeakerMode AudioDriverMediaKit::get_speaker_mode() const {
	return speaker_mode;
}

void AudioDriverMediaKit::lock() {
	if (!mutex)
		return;

	mutex.lock();
}

void AudioDriverMediaKit::unlock() {
	if (!mutex)
		return;

	mutex.unlock();
}

void AudioDriverMediaKit::finish() {
	delete player;

	if (samples_in) {
		memdelete_arr(samples_in);
	};
}

AudioDriverMediaKit::AudioDriverMediaKit() {
	player = nullptr;
}

AudioDriverMediaKit::~AudioDriverMediaKit() {
}

#endif