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- //midi for embedded chips,
- //Copyright 2010 Alex Norman
- //
- //This file is part of avr-midi.
- //
- //avr-midi is free software: you can redistribute it and/or modify
- //it under the terms of the GNU General Public License as published by
- //the Free Software Foundation, either version 3 of the License, or
- //(at your option) any later version.
- //
- //avr-midi is distributed in the hope that it will be useful,
- //but WITHOUT ANY WARRANTY; without even the implied warranty of
- //MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- //GNU General Public License for more details.
- //
- //You should have received a copy of the GNU General Public License
- //along with avr-midi. If not, see <http://www.gnu.org/licenses/>.
-
- #include "midi_device.h"
- #include "midi.h"
-
- #ifndef NULL
- #define NULL 0
- #endif
-
- //forward declarations, internally used to call the callbacks
- void midi_input_callbacks(MidiDevice * device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2);
- void midi_process_byte(MidiDevice * device, uint8_t input);
-
- void midi_device_init(MidiDevice * device){
- device->input_state = IDLE;
- device->input_count = 0;
- bytequeue_init(&device->input_queue, device->input_queue_data, MIDI_INPUT_QUEUE_LENGTH);
-
- //three byte funcs
- device->input_cc_callback = NULL;
- device->input_noteon_callback = NULL;
- device->input_noteoff_callback = NULL;
- device->input_aftertouch_callback = NULL;
- device->input_pitchbend_callback = NULL;
- device->input_songposition_callback = NULL;
-
- //two byte funcs
- device->input_progchange_callback = NULL;
- device->input_chanpressure_callback = NULL;
- device->input_songselect_callback = NULL;
- device->input_tc_quarterframe_callback = NULL;
-
- //one byte funcs
- device->input_realtime_callback = NULL;
- device->input_tunerequest_callback = NULL;
-
- //var byte functions
- device->input_sysex_callback = NULL;
- device->input_fallthrough_callback = NULL;
- device->input_catchall_callback = NULL;
-
- device->pre_input_process_callback = NULL;
- }
-
- void midi_device_input(MidiDevice * device, uint8_t cnt, uint8_t * input) {
- uint8_t i;
- for (i = 0; i < cnt; i++)
- bytequeue_enqueue(&device->input_queue, input[i]);
- }
-
- void midi_device_set_send_func(MidiDevice * device, midi_var_byte_func_t send_func){
- device->send_func = send_func;
- }
-
- void midi_device_set_pre_input_process_func(MidiDevice * device, midi_no_byte_func_t pre_process_func){
- device->pre_input_process_callback = pre_process_func;
- }
-
- void midi_device_process(MidiDevice * device) {
- //call the pre_input_process_callback if there is one
- if(device->pre_input_process_callback)
- device->pre_input_process_callback(device);
-
- //pull stuff off the queue and process
- byteQueueIndex_t len = bytequeue_length(&device->input_queue);
- uint16_t i;
- //TODO limit number of bytes processed?
- for(i = 0; i < len; i++) {
- uint8_t val = bytequeue_get(&device->input_queue, 0);
- midi_process_byte(device, val);
- bytequeue_remove(&device->input_queue, 1);
- }
- }
-
- void midi_process_byte(MidiDevice * device, uint8_t input) {
- if (midi_is_realtime(input)) {
- //call callback, store and restore state
- input_state_t state = device->input_state;
- device->input_state = ONE_BYTE_MESSAGE;
- midi_input_callbacks(device, 1, input, 0, 0);
- device->input_state = state;
- } else if (midi_is_statusbyte(input)) {
- //store the byte
- if (device->input_state != SYSEX_MESSAGE) {
- device->input_buffer[0] = input;
- device->input_count = 1;
- }
- switch (midi_packet_length(input)) {
- case ONE:
- device->input_state = ONE_BYTE_MESSAGE;;
- midi_input_callbacks(device, 1, input, 0, 0);
- device->input_state = IDLE;
- break;
- case TWO:
- device->input_state = TWO_BYTE_MESSAGE;
- break;
- case THREE:
- device->input_state = THREE_BYTE_MESSAGE;
- break;
- case UNDEFINED:
- switch(input) {
- case SYSEX_BEGIN:
- device->input_state = SYSEX_MESSAGE;
- device->input_buffer[0] = input;
- device->input_count = 1;
- break;
- case SYSEX_END:
- //send what is left in the input buffer, set idle
- device->input_buffer[device->input_count % 3] = input;
- device->input_count += 1;
- //call the callback
- midi_input_callbacks(device, device->input_count,
- device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
- device->input_state = IDLE;
- break;
- default:
- device->input_state = IDLE;
- device->input_count = 0;
- }
-
- break;
- default:
- device->input_state = IDLE;
- device->input_count = 0;
- break;
- }
- } else {
- if (device->input_state != IDLE) {
- //store the byte
- device->input_buffer[device->input_count % 3] = input;
- //increment count
- uint16_t prev = device->input_count;
- device->input_count += 1;
-
- switch(prev % 3) {
- case 2:
- //call callback
- midi_input_callbacks(device, device->input_count,
- device->input_buffer[0], device->input_buffer[1], device->input_buffer[2]);
- if (device->input_state != SYSEX_MESSAGE) {
- //set to 1, keeping status byte, allowing for running status
- device->input_count = 1;
- }
- break;
- case 1:
- if (device->input_state == TWO_BYTE_MESSAGE) {
- //call callback
- midi_input_callbacks(device, device->input_count,
- device->input_buffer[0], device->input_buffer[1], 0);
- if (device->input_state != SYSEX_MESSAGE) {
- //set to 1, keeping status byte, allowing for running status
- device->input_count = 1;
- }
- }
- break;
- case 0:
- default:
- //one byte messages are dealt with directly
- break;
- }
- }
- }
- }
-
- void midi_input_callbacks(MidiDevice * device, uint16_t cnt, uint8_t byte0, uint8_t byte1, uint8_t byte2) {
- //did we end up calling a callback?
- bool called = false;
- if (device->input_state == SYSEX_MESSAGE) {
- if (device->input_sysex_callback) {
- const uint16_t start = ((cnt - 1) / 3) * 3;
- const uint8_t length = (cnt - start);
- uint8_t data[3];
- data[0] = byte0;
- data[1] = byte1;
- data[2] = byte2;
- device->input_sysex_callback(device, start, length, data);
- called = true;
- }
- } else {
- switch (cnt) {
- case 3:
- {
- midi_three_byte_func_t func = NULL;
- switch (byte0 & 0xF0) {
- case MIDI_CC:
- func = device->input_cc_callback;
- break;
- case MIDI_NOTEON:
- func = device->input_noteon_callback;
- break;
- case MIDI_NOTEOFF:
- func = device->input_noteoff_callback;
- break;
- case MIDI_AFTERTOUCH:
- func = device->input_aftertouch_callback;
- break;
- case MIDI_PITCHBEND:
- func = device->input_pitchbend_callback;
- break;
- case 0xF0:
- if (byte0 == MIDI_SONGPOSITION)
- func = device->input_songposition_callback;
- break;
- default:
- break;
- }
- if(func) {
- //mask off the channel for non song position functions
- if (byte0 == MIDI_SONGPOSITION)
- func(device, byte0, byte1, byte2);
- else
- func(device, byte0 & 0x0F, byte1, byte2);
- called = true;
- }
- }
- break;
- case 2:
- {
- midi_two_byte_func_t func = NULL;
- switch (byte0 & 0xF0) {
- case MIDI_PROGCHANGE:
- func = device->input_progchange_callback;
- break;
- case MIDI_CHANPRESSURE:
- func = device->input_chanpressure_callback;
- break;
- case 0xF0:
- if (byte0 == MIDI_SONGSELECT)
- func = device->input_songselect_callback;
- else if (byte0 == MIDI_TC_QUARTERFRAME)
- func = device->input_tc_quarterframe_callback;
- break;
- default:
- break;
- }
- if(func) {
- //mask off the channel
- if (byte0 == MIDI_SONGSELECT || byte0 == MIDI_TC_QUARTERFRAME)
- func(device, byte0, byte1);
- else
- func(device, byte0 & 0x0F, byte1);
- called = true;
- }
- }
- break;
- case 1:
- {
- midi_one_byte_func_t func = NULL;
- if (midi_is_realtime(byte0))
- func = device->input_realtime_callback;
- else if (byte0 == MIDI_TUNEREQUEST)
- func = device->input_tunerequest_callback;
- if (func) {
- func(device, byte0);
- called = true;
- }
- }
- break;
- default:
- //just in case
- if (cnt > 3)
- cnt = 0;
- break;
- }
- }
-
- //if there is fallthrough default callback and we haven't called a more specific one,
- //call the fallthrough
- if (!called && device->input_fallthrough_callback)
- device->input_fallthrough_callback(device, cnt, byte0, byte1, byte2);
- //always call the catch all if it exists
- if (device->input_catchall_callback)
- device->input_catchall_callback(device, cnt, byte0, byte1, byte2);
- }
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