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245 lines
9 KiB
C
245 lines
9 KiB
C
/* RetroArch - A frontend for libretro.
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* Copyright (C) 2018 The RetroArch team
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*
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* RetroArch is free software: you can redistribute it and/or modify it under the terms
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* of the GNU General Public License as published by the Free Software Found-
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* ation, either version 3 of the License, or (at your option) any later version.
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*
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* RetroArch is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY;
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* without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
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* PURPOSE. See the GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along with RetroArch.
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* If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __MIDI_DRIVER__H
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#define __MIDI_DRIVER__H
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#include <boolean.h>
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#include <retro_common_api.h>
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RETRO_BEGIN_DECLS
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struct string_list;
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typedef struct
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{
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uint8_t *data;
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size_t data_size;
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uint32_t delta_time;
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} midi_event_t;
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typedef struct midi_driver
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{
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/**
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* ident:
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* Driver name (visible in the menu). Must be unique among the MIDI drivers.
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**/
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const char *ident;
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/**
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* get_avail_inputs:
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* Populates provided list with currently available inputs (if any).
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*
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* @inputs : List of available inputs (visible in the menu).
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* This argument will never be NULL.
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*
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* Returns: True if successful (even if there are no inputs available),
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* false otherwise.
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*
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* Remarks: Before this function is called the list will already contain one
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* member ("Off") which can be used by the user to disable input.
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*
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* If the driver supports input but underlying API don't offers this
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* list, driver should/must provide some "fake" name(s) here,
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* otherwise user will only see "Off" option in the menu.
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**/
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bool (*get_avail_inputs)(struct string_list *inputs);
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/**
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* get_avail_outputs:
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* Populates provided list with currently available outputs (if any).
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*
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* @outputs : List of available outputs (visible in the menu).
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* This argument will never be NULL.
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*
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* Returns: True if successful (even if there are no outputs available),
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* false otherwise.
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*
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* Remarks: Before this function is called the list will already contain one
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* member ("Off") which can be used by the user to disable output.
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*
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* If the driver supports output but underlying API don't offers this
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* list, driver should/must provide some "fake" name(s) here,
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* otherwise user will only see "Off" option in the menu.
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**/
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bool (*get_avail_outputs)(struct string_list *outputs);
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/**
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* init:
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* Initializes driver and starts input (if 'input' argument is non NULL) and
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* starts output (if 'output' argument is non NULL).
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*
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* @input : One of the input names previously returned by
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* the 'get_avail_inputs' function or NULL which
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* means don't initialize input.
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* @output : One of the output names previously returned by
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* the 'get_avail_outputs' function or NULL which
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* means don't initialize output.
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*
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* Returns: Driver specific data pointer if successful, NULL otherwise.
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*
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* Remarks: If requested input/output is unavailable driver should return
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* NULL (don't implement "fallback" mechanism).
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**/
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void *(*init)(const char *input, const char *output);
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/**
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* free:
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* Stops I/O and releases any resources used by the driver.
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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**/
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void (*free)(void *p);
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/**
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* set_input:
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* This function is used for changing/disabling input.
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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* @input : One of the input names previously returned by
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* the 'get_avail_inputs' function or NULL which
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* means disable input.
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*
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* Returns: True if successful, false otherwise.
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*
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* Remarks: On error, driver should leave the current input as is (if possible).
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**/
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bool (*set_input)(void *p, const char *input);
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/**
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* set_output:
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* This function is used for changing/disabling output.
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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* @output : One of the output names previously returned by
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* the 'get_avail_outputs' function or NULL which
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* means disable output.
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*
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* Returns: True if successful, false otherwise.
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*
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* Remarks: On error, driver should leave the current output as is (if possible).
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**/
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bool (*set_output)(void *p, const char *output);
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/**
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* read:
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* This function is used for reading received data. When called, 'data_size'
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* member of the 'event' argument will hold max data size (in bytes)
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* that event can hold. After successful read driver should set this member
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* to actual data size that is returned, and 'delta_time' member should be
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* set to time (in microseconds) between previous event and this one (if this
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* is the first event set 'delta_time' to 0).
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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* @event : Address of the event structure.
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* This argument will never be NULL, 'data' member
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* will never be NULL and 'data_size' member
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* will never be 0.
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*
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* Returns: True if event was available and read successfully, false otherwise.
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*
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* Remarks: If the driver can't supply timing info 'delta_time' member
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* of the 'event' argument should be set to 0.
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**/
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bool (*read)(void *p, midi_event_t *event);
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/**
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* write:
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* This function is used for writing events.
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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* @event : Address of the event structure.
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* This argument will never be NULL, 'data' member
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* will never be NULL and 'data_size' member
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* will never be 0.
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*
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* Returns: True if event was written successfully, false otherwise.
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*
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* Remarks: This event should be buffered by the driver and sent later
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* when 'flush' function is called.
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*
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* If the underlying API don't support event scheduling 'delta_time'
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* member of the 'event' argument may be ignored by the driver.
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**/
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bool (*write)(void *p, const midi_event_t *event);
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/**
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* flush:
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* This function is used for transferring events previously stored by the
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* 'write' function.
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*
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* @p : Driver specific data pointer previously returned
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* by the 'init' function.
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* This argument will never be NULL.
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*
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* Returns: True if successful, false otherwise.
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*
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* Remarks: On error, drivers should keep the events (don't drop them).
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**/
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bool (*flush)(void *p);
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} midi_driver_t;
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struct string_list *midi_driver_get_avail_inputs(void);
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struct string_list *midi_driver_get_avail_outputs(void);
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bool midi_driver_set_volume(unsigned volume);
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bool midi_driver_set_input(const char *input);
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bool midi_driver_set_output(void *data, const char *output);
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/**
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* midi_driver_get_event_size:
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* This is a convenience function for finding out the size of the event based
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* on the status byte.
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*
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* @status : Status (first) byte of the event.
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*
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* Returns: Size of the event (in bytes). If 'status' argument is invalid
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* (< 0x80) or 'status' represents start of the "SysEx" event (0xF0)
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* this function will return 0.
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**/
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size_t midi_driver_get_event_size(uint8_t status);
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bool midi_driver_input_enabled(void);
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bool midi_driver_output_enabled(void);
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bool midi_driver_flush(void);
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bool midi_driver_read(uint8_t *byte);
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bool midi_driver_write(uint8_t byte, uint32_t delta_time);
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bool midi_driver_set_all_sounds_off(void);
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extern midi_driver_t midi_winmm;
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extern midi_driver_t midi_alsa;
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extern midi_driver_t *midi_drivers[];
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RETRO_END_DECLS
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#endif
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