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diff --git a/src/class/midi/midi_host.h b/src/class/midi/midi_host.h
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+++ b/src/class/midi/midi_host.h
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+/*
+ * The MIT License (MIT)
+ *
+ * Copyright (c) 2019 Ha Thach (tinyusb.org)
+ *
+ * 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.
+ *
+ * This file is part of the TinyUSB stack.
+ */
+
+#ifndef TUSB_MIDI_HOST_H_
+#define TUSB_MIDI_HOST_H_
+
+#include "class/audio/audio.h"
+#include "midi.h"
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+//--------------------------------------------------------------------+
+// Class Driver Configuration
+//--------------------------------------------------------------------+
+#ifndef CFG_TUH_MIDI_RX_BUFSIZE
+#define CFG_TUH_MIDI_RX_BUFSIZE TUH_EPSIZE_BULK_MPS
+#endif
+
+#ifndef CFG_TUH_MIDI_TX_BUFSIZE
+#define CFG_TUH_MIDI_TX_BUFSIZE TUH_EPSIZE_BULK_MPS
+#endif
+
+#ifndef CFG_TUH_MIDI_EP_BUFSIZE
+#define CFG_TUH_MIDI_EP_BUFSIZE TUH_EPSIZE_BULK_MPS
+#endif
+
+// Enable the MIDI stream read/write API. Some library can work with raw USB MIDI packet
+// Disable this can save driver footprint.
+#ifndef CFG_TUH_MIDI_STREAM_API
+#define CFG_TUH_MIDI_STREAM_API 1
+#endif
+
+//--------------------------------------------------------------------+
+// Application Types
+//--------------------------------------------------------------------+
+typedef struct {
+  const tusb_desc_interface_t* desc_audio_control;
+  const tusb_desc_interface_t* desc_midi; // start of whole midi interface descriptor
+  uint16_t desc_midi_total_len;
+
+  const uint8_t* desc_header;
+  const uint8_t* desc_element;
+  const tusb_desc_endpoint_t* desc_epin;  // endpoint IN descriptor, CS_ENDPOINT is right after
+  const tusb_desc_endpoint_t* desc_epout; // endpoint OUT descriptor, CS_ENDPOINT is right after
+
+  uint8_t jack_num;
+  const uint8_t* desc_jack[32]; // list of jack descriptors (embedded + external)
+} tuh_midi_descriptor_cb_t;
+
+typedef struct {
+  uint8_t daddr;
+  uint8_t bInterfaceNumber; // interface number of MIDI streaming
+  uint8_t rx_cable_count;
+  uint8_t tx_cable_count;
+} tuh_midi_mount_cb_t;
+
+//--------------------------------------------------------------------+
+// Application API
+//--------------------------------------------------------------------+
+
+// Check if MIDI interface is mounted
+bool tuh_midi_mounted(uint8_t idx);
+
+// Get Interface index from device address + interface number
+// return TUSB_INDEX_INVALID_8 (0xFF) if not found
+uint8_t tuh_midi_itf_get_index(uint8_t daddr, uint8_t itf_num);
+
+// Get Interface information
+// return true if index is correct and interface is currently mounted
+bool tuh_midi_itf_get_info(uint8_t idx, tuh_itf_info_t* info);
+
+// return the number of virtual midi cables on the device's IN endpoint
+uint8_t tuh_midi_get_rx_cable_count(uint8_t idx);
+
+// return the number of virtual midi cables on the device's OUT endpoint
+uint8_t tuh_midi_get_tx_cable_count(uint8_t idx);
+
+// return the raw number of bytes available.
+// Note: this is related but not the same as number of stream bytes available.
+uint32_t tuh_midi_read_available(uint8_t idx);
+
+// Send any queued packets to the device if the host hardware is able to do it
+// Returns the number of bytes flushed to the host hardware or 0 if
+// the host hardware is busy or there is nothing in queue to send.
+uint32_t tuh_midi_write_flush(uint8_t idx);
+
+//--------------------------------------------------------------------+
+// Packet API
+//--------------------------------------------------------------------+
+
+// Read all available MIDI packets from the connected device
+// Return number of bytes read (always multiple of 4)
+uint32_t tuh_midi_packet_read_n(uint8_t idx, uint8_t* buffer, uint32_t bufsize);
+
+// Read a raw MIDI packet from the connected device
+// Return true if a packet was returned
+TU_ATTR_ALWAYS_INLINE static inline
+bool tuh_midi_packet_read (uint8_t idx, uint8_t packet[4]) {
+ return 4 == tuh_midi_packet_read_n(idx, packet, 4);
+}
+
+// Write all 4-byte packets, data is locally buffered and only transferred when buffered bytes
+// reach the endpoint packet size or tuh_midi_write_flush() is called
+uint32_t tuh_midi_packet_write_n(uint8_t idx, const uint8_t* buffer, uint32_t bufsize);
+
+// Write a 4-bytes packet to the device.
+// Returns true if the packet was successfully queued.
+TU_ATTR_ALWAYS_INLINE static inline
+bool tuh_midi_packet_write (uint8_t idx, uint8_t const packet[4]) {
+ return 4 == tuh_midi_packet_write_n(idx, packet, 4);
+}
+
+//--------------------------------------------------------------------+
+// Stream API
+//--------------------------------------------------------------------+
+#if CFG_TUH_MIDI_STREAM_API
+
+// Queue a message to the device using stream API. data is locally buffered and only transferred when buffered bytes
+// reach the endpoint packet size or tuh_midi_write_flush() is called
+// Returns number of bytes was successfully queued.
+uint32_t tuh_midi_stream_write(uint8_t idx, uint8_t cable_num, uint8_t const *p_buffer, uint32_t bufsize);
+
+// Get the MIDI stream from the device. Set the value pointed
+// to by p_cable_num to the MIDI cable number intended to receive it.
+// The MIDI stream will be stored in the buffer pointed to by p_buffer.
+// Return the number of bytes added to the buffer.
+// Note that this function ignores the CIN field of the MIDI packet
+// because a number of commercial devices out there do not encode
+// it properly.
+uint32_t tuh_midi_stream_read(uint8_t idx, uint8_t *p_cable_num, uint8_t *p_buffer, uint16_t bufsize);
+
+#endif
+
+//--------------------------------------------------------------------+
+// Callbacks (Weak is optional)
+//--------------------------------------------------------------------+
+
+// Invoked when MIDI interface is detected in enumeration. Application can copy/parse descriptor if needed.
+// Note: may be fired before tuh_midi_mount_cb(), therefore midi interface is not mounted/ready.
+void tuh_midi_descriptor_cb(uint8_t idx, const tuh_midi_descriptor_cb_t * desc_cb_data);
+
+// Invoked when device with MIDI interface is mounted.
+void tuh_midi_mount_cb(uint8_t idx, const tuh_midi_mount_cb_t* mount_cb_data);
+
+// Invoked when device with MIDI interface is un-mounted
+void tuh_midi_umount_cb(uint8_t idx);
+
+// Invoked when received new data
+void tuh_midi_rx_cb(uint8_t idx, uint32_t xferred_bytes);
+
+// Invoked when a TX is complete and therefore space becomes available in TX buffer
+void tuh_midi_tx_cb(uint8_t idx, uint32_t xferred_bytes);
+
+//--------------------------------------------------------------------+
+// Internal Class Driver API
+//--------------------------------------------------------------------+
+bool midih_init       (void);
+bool midih_deinit     (void);
+bool midih_open       (uint8_t rhport, uint8_t dev_addr, tusb_desc_interface_t const *desc_itf, uint16_t max_len);
+bool midih_set_config (uint8_t dev_addr, uint8_t itf_num);
+bool midih_xfer_cb    (uint8_t dev_addr, uint8_t ep_addr, xfer_result_t result, uint32_t xferred_bytes);
+void midih_close      (uint8_t daddr);
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif