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-rw-r--r--quantum/midi/midi_device.c277
1 files changed, 277 insertions, 0 deletions
diff --git a/quantum/midi/midi_device.c b/quantum/midi/midi_device.c
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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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