midi_processor_transpose.cpp

/* MIT License
 *
 * Copyright (c) 2022 rppicomidi
 *
 * 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.
 */
#include "midi_processor_transpose.h"
#include "parson.h"

bool rppicomidi::Midi_processor_transpose::process(uint8_t* packet)
 {
    bool success = true; // Only block passing the message on if transposing makes the note out of MIDI range
    if (get_channel_num(packet) == chan.get()) {
        uint8_t status = packet[1] & 0xf0;
        if (status == 0x90 || status == 0x80) {
            // note message
            if (packet[2] >= min_note.get() && packet[2] <= max_note.get()) {
                int new_note = packet[2] + transpose_delta.get();
                if (new_note >= min_note.get() && new_note <= max_note.get()) {
                    packet[2] = static_cast<uint8_t>(new_note);
                }
                else {
                    success = false;
                }
            }
        }
    }
    return success;
}

void rppicomidi::Midi_processor_transpose::serialize_settings(const char* name, JSON_Object *root_object)
{
    JSON_Value *proc_value = json_value_init_object();
    JSON_Object *proc_object = json_value_get_object(proc_value);
    chan.serialize(proc_object);
    display_format.serialize(proc_object);
    min_note.serialize(proc_object);
    max_note.serialize(proc_object);
    transpose_delta.serialize(proc_object);
    json_object_set_value(root_object, name, proc_value);
    dirty = false;
}

bool rppicomidi::Midi_processor_transpose::deserialize_settings(JSON_Object *root_object)
{
    bool result = false;
    if (chan.deserialize(root_object))
        result = true;

    if (!result || !display_format.deserialize(root_object))
        result = false;

    if (!result || !min_note.deserialize(root_object))
        result = false;

    if (!result || !max_note.deserialize(root_object))
        result = false;

    if (!result || !transpose_delta.deserialize(root_object))
        result = false;
    if (result) {
        dirty = false;
    }
    return result;
}

void rppicomidi::Midi_processor_transpose::load_defaults()
{
    chan.set_default();
    min_note.set_default();
    max_note.set_default();
    transpose_delta.set_default();
    dirty = false;
}