/*
             LUFA Library
     Copyright (C) Dean Camera, 2021.

  dean [at] fourwalledcubicle [dot] com
           www.lufa-lib.org
*/

/*
  Copyright 2021  Dean Camera (dean [at] fourwalledcubicle [dot] com)

  Permission to use, copy, modify, distribute, and sell this
  software and its documentation for any purpose is hereby granted
  without fee, provided that the above copyright notice appear in
  all copies and that both that the copyright notice and this
  permission notice and warranty disclaimer appear in supporting
  documentation, and that the name of the author not be used in
  advertising or publicity pertaining to distribution of the
  software without specific, written prior permission.

  The author disclaims all warranties with regard to this
  software, including all implied warranties of merchantability
  and fitness.  In no event shall the author be liable for any
  special, indirect or consequential damages or any damages
  whatsoever resulting from loss of use, data or profits, whether
  in an action of contract, negligence or other tortious action,
  arising out of or in connection with the use or performance of
  this software.
*/

/** \file
 *  \brief Common definitions and declarations for the library USB MIDI Class driver.
 *
 *  Common definitions and declarations for the library USB MIDI Class driver.
 *
 *  \note This file should not be included directly. It is automatically included as needed by the USB module driver
 *        dispatch header located in LUFA/Drivers/USB.h.
 */

/** \ingroup Group_USBClassMIDI
 *  \defgroup Group_USBClassMIDICommon  Common Class Definitions
 *
 *  \section Sec_USBClassMIDICommon_ModDescription Module Description
 *  Constants, Types and Enum definitions that are common to both Device and Host modes for the USB
 *  MIDI Class.
 *
 *  @{
 */

#ifndef _MIDI_CLASS_COMMON_H_
#define _MIDI_CLASS_COMMON_H_

	/* Macros: */
		#define __INCLUDE_FROM_AUDIO_DRIVER

	/* Includes: */
		#include "../../Core/StdDescriptors.h"
		#include "AudioClassCommon.h"

	/* Enable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			extern "C" {
		#endif

	/* Preprocessor Checks: */
		#if !defined(__INCLUDE_FROM_MIDI_DRIVER)
			#error Do not include this file directly. Include LUFA/Drivers/USB.h instead.
		#endif

	/* Macros: */
		/** \name MIDI Command Values
		 *  See http://www.midi.org/techspecs/midimessages.php for more information.
		 */
		/**@{*/
		/** MIDI command for System Exclusive (SysEx) single event that has one byte of data total. */
		#define MIDI_COMMAND_SYSEX_1BYTE           MIDI_COMMAND_SYSEX_END_1BYTE

		/** MIDI command for System Exclusive (SysEx) single event that has two bytes of data total. */
		#define MIDI_COMMAND_SYSEX_2BYTE           0x20

		/** MIDI command for System Exclusive (SysEx) single event that has three bytes of data total. */
		#define MIDI_COMMAND_SYSEX_3BYTE           0x30

		/** MIDI command for System Exclusive (SysEx) stream event that has at least four bytes of data total. */
		#define MIDI_COMMAND_SYSEX_START_3BYTE     0x40

		/** MIDI command for System Exclusive (SysEx) stream event terminator with one remaining data byte. */
		#define MIDI_COMMAND_SYSEX_END_1BYTE       0x50

		/** MIDI command for System Exclusive (SysEx) stream event terminator with two remaining data bytes. */
		#define MIDI_COMMAND_SYSEX_END_2BYTE       0x60

		/** MIDI command for System Exclusive (SysEx) stream event terminator with three remaining data bytes. */
		#define MIDI_COMMAND_SYSEX_END_3BYTE       0x70

		/** MIDI command for a note off (deactivation) event. */
		#define MIDI_COMMAND_NOTE_OFF              0x80

		/** MIDI command for a note on (activation) event. */
		#define MIDI_COMMAND_NOTE_ON               0x90

		/** MIDI command for a note pressure change event. */
		#define MIDI_COMMAND_NOTE_PRESSURE         0xA0

		/** MIDI command for a control change event. */
		#define MIDI_COMMAND_CONTROL_CHANGE        0xB0

		/** MIDI command for a control change event. */
		#define MIDI_COMMAND_PROGRAM_CHANGE        0xC0

		/** MIDI command for a channel pressure change event. */
		#define MIDI_COMMAND_CHANNEL_PRESSURE      0xD0

		/** MIDI command for a pitch change event. */
		#define MIDI_COMMAND_PITCH_WHEEL_CHANGE    0xE0
		/**@}*/

		/** Standard key press velocity value used for all note events. */
		#define MIDI_STANDARD_VELOCITY             64

		/** Convenience macro. MIDI channels are numbered from 1-10 (natural numbers) however the logical channel
		 *  addresses are zero-indexed. This converts a natural MIDI channel number into the logical channel address.
		 *
		 *  \param[in] channel  MIDI channel number to address.
		 *
		 *  \return Constructed MIDI channel ID.
		 */
		#define MIDI_CHANNEL(channel)              ((channel) - 1)

		/** Constructs a MIDI event ID from a given MIDI command and a virtual MIDI cable index. This can then be
		 *  used to create and decode \ref MIDI_EventPacket_t MIDI event packets.
		 *
		 *  \param[in] virtualcable  Index of the virtual MIDI cable the event relates to
		 *  \param[in] command       MIDI command to send through the virtual MIDI cable
		 *
		 *  \return Constructed MIDI event ID.
		 */
		#define MIDI_EVENT(virtualcable, command)  (((virtualcable) << 4) | ((command) >> 4))

	/* Enums: */
		/** Enum for the possible MIDI jack types in a MIDI device jack descriptor. */
		enum MIDI_JackTypes_t
		{
			MIDI_JACKTYPE_Embedded = 0x01, /**< MIDI class descriptor jack type value for an embedded (logical) MIDI input or output jack. */
			MIDI_JACKTYPE_External = 0x02, /**< MIDI class descriptor jack type value for an external (physical) MIDI input or output jack. */
		};

	/* Type Defines: */
		/** \brief MIDI class-specific Streaming Interface Descriptor (LUFA naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI streaming interface descriptor. This indicates to the host
		 *  how MIDI the specification compliance of the device and the total length of the Audio class-specific descriptors.
		 *  See the USB Audio specification for more details.
		 *
		 *  \see \ref USB_MIDI_StdDescriptor_AudioInterface_AS_t for the version of this type with standard element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
			uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint16_t                AudioSpecification; /**< Binary coded decimal value, indicating the supported Audio Class
			                                             *   specification version.
			                                             *
			                                             *   \see \ref VERSION_BCD() utility macro.
			                                             */
			uint16_t                TotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
		} ATTR_PACKED USB_MIDI_Descriptor_AudioInterface_AS_t;

		/** \brief MIDI class-specific Streaming Interface Descriptor (USB-IF naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI streaming interface descriptor. This indicates to the host
		 *  how MIDI the specification compliance of the device and the total length of the Audio class-specific descriptors.
		 *  See the USB Audio specification for more details.
		 *
		 *  \see \ref USB_MIDI_Descriptor_AudioInterface_AS_t for the version of this type with non-standard LUFA specific
		 *       element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			uint8_t  bLength; /**< Size of the descriptor, in bytes. */
			uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
			                           *   given by the specific class.
			                           */

			uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint16_t bcdMSC; /**< Binary coded decimal value, indicating the supported MIDI Class specification version.
			                  *
			                  *   \see \ref VERSION_BCD() utility macro.
			                  */
			uint16_t wTotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
		} ATTR_PACKED USB_MIDI_StdDescriptor_AudioInterface_AS_t;

		/** \brief MIDI class-specific Input Jack Descriptor (LUFA naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI IN jack. This gives information to the host on a MIDI input, either
		 *  a physical input jack, or a logical jack (receiving input data internally, or from the host via an endpoint).
		 *
		 *  \see \ref USB_MIDI_StdDescriptor_InputJack_t for the version of this type with standard element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
			uint8_t                 Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t                 JackType; /**< Type of jack, one of the \c JACKTYPE_* mask values. */
			uint8_t                 JackID; /**< ID value of this jack - must be a unique value within the device. */

			uint8_t                 JackStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
		} ATTR_PACKED USB_MIDI_Descriptor_InputJack_t;

		/** \brief MIDI class-specific Input Jack Descriptor (USB-IF naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI IN jack. This gives information to the host on a MIDI input, either
		 *  a physical input jack, or a logical jack (receiving input data internally, or from the host via an endpoint).
		 *
		 *  \see \ref USB_MIDI_Descriptor_InputJack_t for the version of this type with non-standard LUFA specific
		 *       element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			uint8_t  bLength; /**< Size of the descriptor, in bytes. */
			uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
			                           *   given by the specific class.
			                           */

			uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t  bJackType; /**< Type of jack, one of the \c JACKTYPE_* mask values. */
			uint8_t  bJackID; /**< ID value of this jack - must be a unique value within the device. */

			uint8_t  iJack; /**< Index of a string descriptor describing this descriptor within the device. */
		} ATTR_PACKED USB_MIDI_StdDescriptor_InputJack_t;

		/** \brief MIDI class-specific Output Jack Descriptor (LUFA naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI OUT jack. This gives information to the host on a MIDI output, either
		 *  a physical output jack, or a logical jack (sending output data internally, or to the host via an endpoint).
		 *
		 *  \see \ref USB_MIDI_StdDescriptor_OutputJack_t for the version of this type with standard element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			USB_Descriptor_Header_t   Header; /**< Regular descriptor header containing the descriptor's type and length. */
			uint8_t                   Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t                   JackType; /**< Type of jack, one of the \c JACKTYPE_* mask values. */
			uint8_t                   JackID; /**< ID value of this jack - must be a unique value within the device. */

			uint8_t                   NumberOfPins; /**< Number of output channels within the jack, either physical or logical. */
			uint8_t                   SourceJackID[1]; /**< ID of each output pin's source data jack. */
			uint8_t                   SourcePinID[1]; /**< Pin number in the input jack of each output pin's source data. */

			uint8_t                   JackStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
		} ATTR_PACKED USB_MIDI_Descriptor_OutputJack_t;

		/** \brief MIDI class-specific Output Jack Descriptor (USB-IF naming conventions).
		 *
		 *  Type define for an Audio class-specific MIDI OUT jack. This gives information to the host on a MIDI output, either
		 *  a physical output jack, or a logical jack (sending output data internally, or to the host via an endpoint).
		 *
		 *  \see \ref USB_MIDI_Descriptor_OutputJack_t for the version of this type with non-standard LUFA specific
		 *       element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			uint8_t  bLength; /**< Size of the descriptor, in bytes. */
			uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
			                           *   given by the specific class.
			                           */

			uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t  bJackType; /**< Type of jack, one of the \c JACKTYPE_* mask values. */
			uint8_t  bJackID; /**< ID value of this jack - must be a unique value within the device. */

			uint8_t  bNrInputPins; /**< Number of output channels within the jack, either physical or logical. */
			uint8_t  baSourceID[1]; /**< ID of each output pin's source data jack. */
			uint8_t  baSourcePin[1]; /**< Pin number in the input jack of each output pin's source data. */

			uint8_t  iJack; /**< Index of a string descriptor describing this descriptor within the device. */
		} ATTR_PACKED USB_MIDI_StdDescriptor_OutputJack_t;

		/** \brief Audio class-specific Jack Endpoint Descriptor (LUFA naming conventions).
		 *
		 *  Type define for an Audio class-specific extended MIDI jack endpoint descriptor. This contains extra information
		 *  on the usage of MIDI endpoints used to stream MIDI events in and out of the USB Audio device, and follows an Audio
		 *  class-specific extended MIDI endpoint descriptor. See the USB Audio specification for more details.
		 *
		 *  \see \ref USB_MIDI_StdDescriptor_Jack_Endpoint_t for the version of this type with standard element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			USB_Descriptor_Header_t   Header; /**< Regular descriptor header containing the descriptor's type and length. */
			uint8_t                   Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t                   TotalEmbeddedJacks; /**< Total number of jacks inside this endpoint. */
			uint8_t                   AssociatedJackID[1]; /**< IDs of each jack inside the endpoint. */
		} ATTR_PACKED USB_MIDI_Descriptor_Jack_Endpoint_t;

		/** \brief Audio class-specific Jack Endpoint Descriptor (USB-IF naming conventions).
		 *
		 *  Type define for an Audio class-specific extended MIDI jack endpoint descriptor. This contains extra information
		 *  on the usage of MIDI endpoints used to stream MIDI events in and out of the USB Audio device, and follows an Audio
		 *  class-specific extended MIDI endpoint descriptor. See the USB Audio specification for more details.
		 *
		 *  \see \ref USB_MIDI_Descriptor_Jack_Endpoint_t for the version of this type with non-standard LUFA specific
		 *       element names.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			uint8_t  bLength; /**< Size of the descriptor, in bytes. */
			uint8_t  bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value
			                           *   given by the specific class.
			                           */

			uint8_t  bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */

			uint8_t  bNumEmbMIDIJack; /**< Total number of jacks inside this endpoint. */
			uint8_t  bAssocJackID[1]; /**< IDs of each jack inside the endpoint. */
		} ATTR_PACKED USB_MIDI_StdDescriptor_Jack_Endpoint_t;

		/** \brief MIDI Class Driver Event Packet.
		 *
		 *  Type define for a USB MIDI event packet, used to encapsulate sent and received MIDI messages from a USB MIDI interface.
		 *
		 *  \note Regardless of CPU architecture, these values should be stored as little endian.
		 */
		typedef struct
		{
			uint8_t  Event; /**< MIDI event type, constructed with the \ref MIDI_EVENT() macro. */

			uint8_t  Data1; /**< First byte of data in the MIDI event. */
			uint8_t  Data2; /**< Second byte of data in the MIDI event. */
			uint8_t  Data3; /**< Third byte of data in the MIDI event. */
		} ATTR_PACKED MIDI_EventPacket_t;

	/* Disable C linkage for C++ Compilers: */
		#if defined(__cplusplus)
			}
		#endif

#endif

/** @} */

