104 lines
2.9 KiB
C++
104 lines
2.9 KiB
C++
/*
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Copyright (C) 2007 Dmitry Baikov
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Original JACK MIDI API implementation Copyright (C) 2004 Ian Esten
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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 Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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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 Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifndef __JackMidiPort__
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#define __JackMidiPort__
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#include "types.h"
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#include "JackConstants.h"
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#include "JackPlatformPlug.h"
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#include <stddef.h>
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/** Type for raw event data contained in @ref jack_midi_event_t. */
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typedef unsigned char jack_midi_data_t;
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/** A Jack MIDI event. */
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struct jack_midi_event_t
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{
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jack_nframes_t time; /**< Sample index at which event is valid */
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size_t size; /**< Number of bytes of data in \a buffer */
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jack_midi_data_t *buffer; /**< Raw MIDI data */
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};
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/** A Jack MIDI port type. */
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#define JACK_DEFAULT_MIDI_TYPE "8 bit raw midi"
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namespace Jack
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{
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struct SERVER_EXPORT JackMidiEvent
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{
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// Most MIDI events are < 4 bytes in size, so we can save a lot, storing them inplace.
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enum { INLINE_SIZE_MAX = sizeof(jack_shmsize_t) };
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uint32_t time;
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jack_shmsize_t size;
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union {
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jack_shmsize_t offset;
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jack_midi_data_t data[INLINE_SIZE_MAX];
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};
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jack_midi_data_t* GetData(void* buffer)
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{
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if (size <= INLINE_SIZE_MAX) {
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return data;
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} else {
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return (jack_midi_data_t*)buffer + offset;
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}
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}
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};
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/*
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* To store events with arbitrarily sized payload, but still have O(1) indexed access
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* we use a trick here:
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* Events are stored in an linear array from the beginning of the buffer,
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* but their data (if not inlined) is stored from the end of the same buffer.
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*/
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struct SERVER_EXPORT JackMidiBuffer
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{
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enum { MAGIC = 0x900df00d };
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uint32_t magic;
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jack_shmsize_t buffer_size;
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jack_nframes_t nframes;
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jack_shmsize_t write_pos; //!< data write position from the end of the buffer.
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uint32_t event_count;
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uint32_t lost_events;
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JackMidiEvent events[1]; // Using 0 size does not compile with older GCC versions, so use 1 here.
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int IsValid() const
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{
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return magic == MAGIC;
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}
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void Reset(jack_nframes_t nframes);
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jack_shmsize_t MaxEventSize() const;
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// checks only size constraints.
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jack_midi_data_t* ReserveEvent(jack_nframes_t time, jack_shmsize_t size);
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};
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void MidiBufferInit(void* buffer, size_t buffer_size, jack_nframes_t nframes);
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} // namespace Jack
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#endif
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