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/*
* mplayer lib
* Copyright (C) 2020-2024 by Juan J. Martinez <jjm@usebox.net>
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*
* Arkos 2 AKM
* Copyright (c) 2016-2020 Julien Névo (contact@julien-nevo.com)
* (check mplayer/akm/LICENSE.txt; MIT License)
*/
#ifndef _MPLAYER_H
#define _MPLAYER_H
#include <stdint.h>
// @Initialization
/**
* Sets the player to play `sub_song` from `song`.
*
* `sub_song` starts from 0.
*
* This function can be called as many times as needed, for example, to change
* the playback to a different sub-song.
*
* It is required to call it at least once before using
* [mplayer_play](#mplayer_play).
*
* Example:
*
* ```c
* // tell the compiler we will use this
* // global symbol
* extern uint8_t SONG[];
*
* mplayer_init(SONG, 0);
* ```
*
* See [exporting songs and effects](#exporting-songs-and-effects) for details
* on how to add songs to your project.
*/
void mplayer_init(const uint8_t *song, uint8_t sub_song);
/**
* Inits the effects table.
*
* It is required to call it least once before using
* [mplayer_play](#mplayer_play) or any of the play effect functions.
*
* Example:
*
* ```c
* // tell the compiler we will use this
* // global symbol
* extern uint8_t EFFECTS[];
*
* mplayer_init_effects(EFFECTS);
* ```
*
* See [exporting songs and effects](#exporting-songs-and-effects) for details
* on how to add effects to your project.
*/
void mplayer_init_effects(const uint8_t *effects);
// @Playback
/**
* Plays a frame using the PSG.
*
* This must be called from the interrupt handler. See
* [set_user_isr](ubox-lib-ref.html#ubox_set_user_isr).
*
* [mplayer_init](#mplayer_init) must be called before using it.
*
* If the player is stopped, [mplayer_stop](#mplayer_stop) must be called to
* silence the PSG.
*/
void mplayer_play(void);
/**
* Silences the PSG, stopping any sound.
*
* This doesn't stop the player if [mplayer_play](#mplayer_play) is called.
*/
void mplayer_stop(void);
// @Sound effects
/**
* Plays `effect_no` on `chan` channel at `inv_vol` volume.
*
* `effect_no` starts on 1 and refers to the index in the effects table set by
* [mplayer_init_effects](#mplayer_init_effects).
*
* `chan` can be 0, 1 or 2. It is recommended to use one channel for effects
* and the other two for the music.
*
* `inv_vol` is the inverted volume, with 0 for max volume and 16 for no sound.
*
* If an effects is already playing on the channel, it will be interrupted and
* replaced by this effect.
*
* The effects table must be set with
* [mplayer_init_effects](#mplayer_init_effects) before using this function.
*
* See [mplayer_play_effect_p](#mplayer_play_effect_p) for playing effects with
* priority.
*
* Example:
*
* ```c
* // plays effect 1 on channel 2 at highest volume
* mplayer_play_effect(1, 2, 0);
* ```
*/
void mplayer_play_effect(uint8_t effect_no, uint8_t chan, uint8_t inv_vol);
/**
* Plays `effect_no` on `chan` channel at `inv_vol` volume using priority.
*
* `effect_no` starts on 1 and refers to the index in the effects table set by
* [mplayer_init_effects](#mplayer_init_effects).
*
* `effect_no` is used as priority, being effect number 1 the one with
* lowest priority.
*
* `chan` can be 0, 1 or 2. It is recommended to use one channel for effects
* and the other two for the music.
*
* `inv_vol` is the inverted volume, with 0 for max volume and 16 for no sound.
*
* The effect is played if no effect is already being played or if the effect
* being played has less priority. In that case, the effect currently being
* played will be interrupted and replaced by this effect.
*
* The effects table must be set with
* [mplayer_init_effects](#mplayer_init_effects) before using this function.
*
* See [mplayer_play_effect](#mplayer_play_effect) for playing effects without
* priority.
*
* Example:
*
* ```c
* // plays effect 2 on channel 2 at highest volume
* mplayer_play_effect_p(2, 2, 0);
* // won't interrupt effect 2 because it is higher priority than 1
* mplayer_play_effect_p(1, 2, 0);
* ```
*/
void mplayer_play_effect_p(uint8_t effect_no, uint8_t chan, uint8_t inv_vol);
/**
* Stops the effect being played on `chan` channel.
*/
void mplayer_stop_effect_channel(uint8_t chan);
/**
* Returns 0 if there's no sound effect being played on `chan` channel, or
* a value different than 0 otherwise.
*/
uint8_t mplayer_is_sound_effect_on(uint8_t chan);
#endif // _MPLAYER_H
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