livetrax/libs/backends/wavesaudio/waves_midi_event.cc

/*
    Copyright (C) 2014 Waves Audio Ltd.

    This program 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 2 of the License, or
    (at your option) any later version.

    This program 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 this program; if not, write to the Free Software
    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "memory.h"
#include "waves_midi_event.h"

using namespace ARDOUR;

WavesMidiEvent::WavesMidiEvent (PmTimestamp timestamp)
    : _size (0)
    , _timestamp (timestamp)
    , _data (NULL)
    , _state (INCOMPLETE) 
{

}


WavesMidiEvent::WavesMidiEvent (PmTimestamp timestamp, const uint8_t* data, size_t datalen)
    : _size (datalen)
    , _timestamp (timestamp)
    , _data (data && datalen ? new uint8_t[ (datalen < sizeof (PmMessage)) ? sizeof (PmMessage) : datalen] : NULL)
    , _state (data && datalen ? COMPLETE : BROKEN) 
{
    // COMMENTED DBG LOGS */ std::cout  << "WavesMidiEvent::WavesMidiEvent (const WavesMidiEvent& source) : Size=" << _size << "---" << datalen << std::endl;
    if (_state == COMPLETE) {
        // COMMENTED DBG LOGS */ std::cout  << "\t\t\t Allocated Size=" << ((datalen < sizeof (PmMessage)) ? sizeof (PmMessage) : datalen) << std::endl;
        memcpy (_data, data, datalen);
    }
}


WavesMidiEvent::WavesMidiEvent (const WavesMidiEvent& source)
    : _size (source.size ())
    , _timestamp (source.timestamp ())
    , _data ((source.size () && source.const_data ()) ? new uint8_t[ (source.size () < sizeof (PmMessage)) ? sizeof (PmMessage) : source.size ()] : NULL)
    , _state (source.state () ) 
{
    // COMMENTED DBG LOGS */ std::cout  << "WavesMidiEvent::WavesMidiEvent (const WavesMidiEvent& source) : Size=" << _size << "---" << source.size () << std::endl;
    // COMMENTED DBG LOGS */ std::cout  << "\t\t\t Allocated Size=" << ((source.size () < sizeof (PmMessage)) ? sizeof (PmMessage) : source.size ()) << std::endl;
    if (_data && source.const_data ()) {
        memcpy (_data, source.const_data (), source.size ());
    }
}


WavesMidiEvent::~WavesMidiEvent ()
{
    delete _data;
}


WavesMidiEvent *WavesMidiEvent::append_data (const PmEvent &midi_event)
{
    switch ( _state ) {
        case INCOMPLETE: 
            break;
        default:
            // COMMENTED DBG LOGS */ std::cout << "WavesMidiEvent::append_data (): NO case INCOMPLETE" << std::endl;
            _state = BROKEN;
            return NULL;
    }

    size_t message_size = _midi_message_size (midi_event.message);
    uint8_t message_status = Pm_MessageStatus (midi_event.message);

    if (_data == NULL) { // This is a first event to add
        bool sysex = (message_status == SYSEX);
        _data = new unsigned char [sysex ? PM_DEFAULT_SYSEX_BUFFER_SIZE : sizeof (PmMessage)];
        if (!sysex)
        {
            // COMMENTED DBG LOGS */ std::cout << "WavesMidiEvent::append_data (): SHORT MSG" << std::endl;
            * (PmMessage*)_data = 0; 
            switch (message_size) {
                case 1:
                case 3:
                    _size = message_size;
                    // COMMENTED DBG LOGS */ std::cout << "WavesMidiEvent::append_data (): size = " << _size << std::endl;
                break;
                default:
                    // COMMENTED DBG LOGS */ std::cout << "WavesMidiEvent::append_data (): WRONG MESSAGE SIZE (" << message_size << ") in the message: ";
                    // COMMENTED DBG LOGS */ std::cout << std::hex << (int) ((unsigned char*)&midi_event)[0] << " " << (int) ((unsigned char*)&midi_event)[1] << " " << (int) ((unsigned char*)&midi_event)[2] << " " << (int) ((unsigned char*)&midi_event)[3] << std::dec << std::endl;
                    _state = BROKEN;
                return NULL;
            }
            // COMMENTED DBG LOGS */ std::cout << "\t size = " << _size << std::endl;
            memcpy (_data, &midi_event.message, _size);
            // COMMENTED DBG LOGS */ std::cout << "\t\t size = " << _size << std::endl;
            _state = COMPLETE;
            // COMMENTED DBG LOGS */ std::cout << "\t\t\t size = " << _size << std::endl;
            return NULL;
        }
    }

    // Now let's parse to sysex msg
    if (message_status >= REAL_TIME_FIRST) { // Nested Real Time MIDI event
        WavesMidiEvent *waves_midi_message = new WavesMidiEvent (midi_event.timestamp);
        waves_midi_message->append_data (midi_event);
        return waves_midi_message;
    }

    if (message_status >= STATUS_FIRST && (message_status != EOX) && _size) { // Certainly it's a broken SYSEX case
        WavesMidiEvent *waves_midi_message = new WavesMidiEvent (midi_event.timestamp);
        waves_midi_message->append_data (midi_event);
        return waves_midi_message;
    }

    const uint8_t* source_data ((uint8_t*)&midi_event.message);
    
    for (size_t i = 0; i < sizeof (midi_event.message); ++i) {
        _data[_size] = source_data[i];
        _size++;
        
        if (source_data[i] == EOX) { // Ended SYSEX message
            _state = COMPLETE;
            return NULL;
        }
    }
    return NULL;
}


size_t WavesMidiEvent::_midi_message_size (PmMessage midi_message)
{
    static int high_lengths[] = {
        1, 1, 1, 1, 1, 1, 1, 1,         /* 0x00 through 0x70 */
        3, 3, 3, 3, 2, 2, 3, 1          /* 0x80 through 0xf0 */
    };

    static int low_lengths[] = {
        1, 2, 3, 2, 1, 1, 1, 1,         /* 0xf0 through 0xf7 */
        1, 1, 1, 1, 1, 1, 1, 1          /* 0xf8 through 0xff */
    };

    int midi_message_status = Pm_MessageStatus (midi_message);

    if (midi_message_status < STATUS_FIRST) {
        return sizeof (midi_message);
    }

    int high = midi_message_status >> 4;
    int low = midi_message_status & 0xF;

    return (high != 0xF) ? high_lengths[high] : low_lengths[low];
}