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