121 lines
2.9 KiB
C++
121 lines
2.9 KiB
C++
/*
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* Copyright (C) 2014-2015 Robin Gareus <robin@gareus.org>
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*
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* This program 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 2 of the License, or
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* (at your option) any later version.
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*
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* This program 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 along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#ifndef __libbackend_alsa_rawmidi_h__
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#define __libbackend_alsa_rawmidi_h__
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#include <stdint.h>
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#include <poll.h>
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#include <pthread.h>
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#include <alsa/asoundlib.h>
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#include "pbd/ringbuffer.h"
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#include "ardour/types.h"
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#include "alsa_midi.h"
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namespace ARDOUR {
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class AlsaRawMidiIO : virtual public AlsaMidiIO {
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public:
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AlsaRawMidiIO (const std::string &name, const char *device, const bool input);
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virtual ~AlsaRawMidiIO ();
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protected:
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snd_rawmidi_t *_device;
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private:
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void init (const char *device_name, const bool input);
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};
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class AlsaRawMidiOut : public AlsaRawMidiIO, public AlsaMidiOut
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{
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public:
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AlsaRawMidiOut (const std::string &name, const char *device);
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void* main_process_thread ();
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};
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class AlsaRawMidiIn : public AlsaRawMidiIO, public AlsaMidiIn
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{
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public:
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AlsaRawMidiIn (const std::string &name, const char *device);
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void* main_process_thread ();
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protected:
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int queue_event (const uint64_t, const uint8_t *, const size_t);
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private:
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void parse_events (const uint64_t, const uint8_t *, const size_t);
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bool process_byte (const uint64_t, const uint8_t);
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void record_byte(uint8_t byte) {
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if (_total_bytes < sizeof(_parser_buffer)) {
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_parser_buffer[_total_bytes] = byte;
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} else {
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++_unbuffered_bytes;
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}
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++_total_bytes;
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}
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void prepare_byte_event(const uint64_t time, const uint8_t byte) {
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_parser_buffer[0] = byte;
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_event.prepare(time, 1);
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}
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bool prepare_buffered_event(const uint64_t time) {
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const bool result = _unbuffered_bytes == 0;
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if (result) {
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_event.prepare(time, _total_bytes);
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}
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_total_bytes = 0;
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_unbuffered_bytes = 0;
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if (_status_byte >= 0xf0) {
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_expected_bytes = 0;
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_status_byte = 0;
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}
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return result;
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}
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struct ParserEvent {
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uint64_t _time;
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size_t _size;
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bool _pending;
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ParserEvent (const uint64_t time, const size_t size)
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: _time(time)
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, _size(size)
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, _pending(false) {}
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void prepare(const uint64_t time, const size_t size) {
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_time = time;
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_size = size;
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_pending = true;
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}
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} _event;
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bool _first_time;
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size_t _unbuffered_bytes;
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size_t _total_bytes;
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size_t _expected_bytes;
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uint8_t _status_byte;
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uint8_t _parser_buffer[1024];
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};
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} // namespace
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#endif
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