jack2/common/JackMidiRawInputWriteQueue.cpp at develop · jackaudio/jack2 · GitHub

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This program is free software; you can redistribute it and/or modify

it under the terms of the GNU Lesser General Public License as published by

the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License

along with this program; if not, write to the Free Software

Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.

#include <cassert>

#include <memory>

#include <new>

#include "JackMidiRawInputWriteQueue.h"

#include "JackError.h"

using Jack::JackMidiRawInputWriteQueue;

JackMidiRawInputWriteQueue::

JackMidiRawInputWriteQueue(JackMidiWriteQueue *write_queue,

size_t max_packet_data, size_t max_packets)

{

packet_queue = new JackMidiAsyncQueue(max_packet_data, max_packets);

std::unique_ptr<JackMidiAsyncQueue> packet_queue_ptr(packet_queue);

input_buffer = new jack_midi_data_t[max_packet_data];

Clear();

expected_bytes = 0;

event_pending = false;

input_buffer_size = max_packet_data;

packet = 0;

status_byte = 0;

this->write_queue = write_queue;

packet_queue_ptr.release();

}

JackMidiRawInputWriteQueue::~JackMidiRawInputWriteQueue()

{

delete[] input_buffer;

delete packet_queue;

}

void

JackMidiRawInputWriteQueue::Clear()

{

total_bytes = 0;

unbuffered_bytes = 0;

}

Jack::JackMidiWriteQueue::EnqueueResult

JackMidiRawInputWriteQueue::EnqueueEvent(jack_nframes_t time, size_t size,

jack_midi_data_t *buffer)

{

return packet_queue->EnqueueEvent(time, size, buffer);

}

size_t

JackMidiRawInputWriteQueue::GetAvailableSpace()

{

return packet_queue->GetAvailableSpace();

}

void

JackMidiRawInputWriteQueue::HandleBufferFailure(size_t unbuffered_bytes,

size_t total_bytes)

{

jack_error("JackMidiRawInputWriteQueue::HandleBufferFailure - %d MIDI "

"byte(s) of a %d byte message could not be buffered. The "

"message has been dropped.", unbuffered_bytes, total_bytes);

}

void

JackMidiRawInputWriteQueue::HandleEventLoss(jack_midi_event_t *event)

{

jack_error("JackMidiRawInputWriteQueue::HandleEventLoss - A %d byte MIDI "

"event scheduled for frame '%d' could not be processed because "

"the write queue cannot accommodate an event of that size. The "

"event has been discarded.", event->size, event->time);

}

void

JackMidiRawInputWriteQueue::HandleIncompleteMessage(size_t total_bytes)

{

jack_error("JackMidiRawInputWriteQueue::HandleIncompleteMessage - "

"Discarding %d MIDI byte(s) of an incomplete message. The "

"MIDI cable may have been unplugged.", total_bytes);

}

void

JackMidiRawInputWriteQueue::HandleInvalidStatusByte(jack_midi_data_t byte)

{

jack_error("JackMidiRawInputWriteQueue::HandleInvalidStatusByte - "

"Dropping invalid MIDI status byte '%x'.", (unsigned int) byte);

}

void

JackMidiRawInputWriteQueue::HandleUnexpectedSysexEnd(size_t total_bytes)

{

jack_error("JackMidiRawInputWriteQueue::HandleUnexpectedSysexEnd - "

"Received a sysex end byte without first receiving a sysex "

"start byte. Discarding %d MIDI byte(s). The cable may have "

"been unplugged.", total_bytes);

}

bool

JackMidiRawInputWriteQueue::PrepareBufferedEvent(jack_nframes_t time)

{

bool result = ! unbuffered_bytes;

if (! result) {

HandleBufferFailure(unbuffered_bytes, total_bytes);

} else {

PrepareEvent(time, total_bytes, input_buffer);

}

Clear();

if (status_byte >= 0xf0) {

expected_bytes = 0;

status_byte = 0;

}

return result;

}

bool

JackMidiRawInputWriteQueue::PrepareByteEvent(jack_nframes_t time,

jack_midi_data_t byte)

{

event_byte = byte;

PrepareEvent(time, 1, &event_byte);

return true;

}

void

JackMidiRawInputWriteQueue::PrepareEvent(jack_nframes_t time, size_t size,

jack_midi_data_t *buffer)

{

event.buffer = buffer;

event.size = size;

event.time = time;

event_pending = true;

}

jack_nframes_t

JackMidiRawInputWriteQueue::Process(jack_nframes_t boundary_frame)

{

if (event_pending) {

if (! WriteEvent(boundary_frame)) {

return event.time;

}

if (! packet) {

packet = packet_queue->DequeueEvent();

}

for (; packet; packet = packet_queue->DequeueEvent()) {

for (; packet->size; (packet->buffer)++, (packet->size)--) {

if (ProcessByte(packet->time, *(packet->buffer))) {

if (! WriteEvent(boundary_frame)) {

(packet->buffer)++;

(packet->size)--;

return event.time;

}

return 0;

}

bool

JackMidiRawInputWriteQueue::ProcessByte(jack_nframes_t time,

jack_midi_data_t byte)

{

if (byte >= 0xf8) {

// Realtime

if (byte == 0xfd) {

HandleInvalidStatusByte(byte);

return false;

}

return PrepareByteEvent(time, byte);

}

if (byte == 0xf7) {

// Sysex end

if (status_byte == 0xf0) {

RecordByte(byte);

return PrepareBufferedEvent(time);

}

HandleUnexpectedSysexEnd(total_bytes);

Clear();

expected_bytes = 0;

status_byte = 0;

return false;

}

if (byte >= 0x80) {

// Non-realtime status byte

if (total_bytes) {

HandleIncompleteMessage(total_bytes);

Clear();

}

status_byte = byte;

switch (byte & 0xf0) {

case 0x80:

case 0x90:

case 0xa0:

case 0xb0:

case 0xe0:

// Note On, Note Off, Aftertouch, Control Change, Pitch Wheel

expected_bytes = 3;

break;

case 0xc0:

case 0xd0:

// Program Change, Channel Pressure

expected_bytes = 2;

break;

case 0xf0:

switch (byte) {

case 0xf0:

// Sysex

expected_bytes = 0;

break;

case 0xf1:

case 0xf3:

// MTC Quarter Frame, Song Select

expected_bytes = 2;

break;

case 0xf2:

// Song Position

expected_bytes = 3;

break;

case 0xf4:

case 0xf5:

// Undefined

HandleInvalidStatusByte(byte);

expected_bytes = 0;

status_byte = 0;

return false;

case 0xf6:

// Tune Request

bool result = PrepareByteEvent(time, byte);

if (result) {

expected_bytes = 0;

status_byte = 0;

}

return result;

}

RecordByte(byte);

return false;

}

// Data byte

if (! status_byte) {

// Data bytes without a status will be discarded.

total_bytes++;

unbuffered_bytes++;

return false;

}

if (! total_bytes) {

// Apply running status.

RecordByte(status_byte);

}

RecordByte(byte);

return (total_bytes == expected_bytes) ? PrepareBufferedEvent(time) :

false;

}

void

JackMidiRawInputWriteQueue::RecordByte(jack_midi_data_t byte)

{

if (total_bytes < input_buffer_size) {

input_buffer[total_bytes] = byte;

} else {

unbuffered_bytes++;

}

total_bytes++;

}

bool

JackMidiRawInputWriteQueue::WriteEvent(jack_nframes_t boundary_frame)

{

if ((! boundary_frame) || (event.time < boundary_frame)) {

switch (write_queue->EnqueueEvent(&event)) {

case BUFFER_TOO_SMALL:

HandleEventLoss(&event);

// Fallthrough on purpose

case OK:

event_pending = false;

return true;

default:

// This is here to stop compilers from warning us about not

// handling enumeration values.

;

}

return false;

}

jack2/common/JackMidiRawInputWriteQueue.cpp at develop · jackaudio/jack2 · GitHub

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