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livetrax/libs/backends/portaudio/winmmemidi_output_device.cc

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/*
* Copyright (C) 2015 Tim Mayberry <mojofunk@gmail.com>
*
* 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 "winmmemidi_output_device.h"
#include <glibmm.h>
#include "pbd/debug.h"
#include "pbd/compose.h"
#include "rt_thread.h"
#include "win_utils.h"
#include "midi_util.h"
#include "debug.h"
// remove dup with input_device
static const uint32_t MIDI_BUFFER_SIZE = 32768;
static const uint32_t MAX_MIDI_MSG_SIZE = 256; // fix this for sysex
static const uint32_t MAX_QUEUE_SIZE = 4096;
namespace ARDOUR {
WinMMEMidiOutputDevice::WinMMEMidiOutputDevice (int index)
: m_handle(0)
, m_queue_semaphore(0)
, m_sysex_semaphore(0)
, m_timer(0)
, m_started(false)
, m_enabled(false)
, m_thread_running(false)
, m_thread_quit(false)
, m_midi_buffer(new RingBuffer<uint8_t>(MIDI_BUFFER_SIZE))
{
DEBUG_MIDI (string_compose ("Creating midi output device index: %1\n", index));
std::string error_msg;
if (!open (index, error_msg)) {
DEBUG_MIDI (error_msg);
throw std::runtime_error (error_msg);
}
set_device_name (index);
}
WinMMEMidiOutputDevice::~WinMMEMidiOutputDevice ()
{
std::string error_msg;
if (!close (error_msg)) {
DEBUG_MIDI (error_msg);
}
}
bool
WinMMEMidiOutputDevice::enqueue_midi_event (uint64_t timestamp,
const uint8_t* data,
size_t size)
{
const uint32_t total_bytes = sizeof(MidiEventHeader) + size;
if (m_midi_buffer->write_space () < total_bytes) {
DEBUG_MIDI ("WinMMEMidiOutput: ring buffer overflow\n");
return false;
}
MidiEventHeader h (timestamp, size);
m_midi_buffer->write ((uint8_t*)&h, sizeof(MidiEventHeader));
m_midi_buffer->write (data, size);
signal (m_queue_semaphore);
return true;
}
bool
WinMMEMidiOutputDevice::open (UINT index, std::string& error_msg)
{
MMRESULT result = midiOutOpen (&m_handle,
index,
(DWORD_PTR)winmm_output_callback,
(DWORD_PTR) this,
CALLBACK_FUNCTION);
if (result != MMSYSERR_NOERROR) {
error_msg = get_error_string (result);
return false;
}
m_queue_semaphore = CreateSemaphore (NULL, 0, MAX_QUEUE_SIZE, NULL);
if (m_queue_semaphore == NULL) {
DEBUG_MIDI ("WinMMEMidiOutput: Unable to create queue semaphore\n");
return false;
}
m_sysex_semaphore = CreateSemaphore (NULL, 0, 1, NULL);
if (m_sysex_semaphore == NULL) {
DEBUG_MIDI ("WinMMEMidiOutput: Unable to create sysex semaphore\n");
return false;
}
return true;
}
bool
WinMMEMidiOutputDevice::close (std::string& error_msg)
{
// return error message for first error encountered?
bool success = true;
MMRESULT result = midiOutReset (m_handle);
if (result != MMSYSERR_NOERROR) {
error_msg = get_error_string (result);
DEBUG_MIDI (error_msg);
success = false;
}
result = midiOutClose (m_handle);
if (result != MMSYSERR_NOERROR) {
error_msg = get_error_string (result);
DEBUG_MIDI (error_msg);
success = false;
}
if (m_sysex_semaphore) {
if (!CloseHandle (m_sysex_semaphore)) {
DEBUG_MIDI ("WinMMEMidiOut Unable to close sysex semaphore\n");
success = false;
} else {
m_sysex_semaphore = 0;
}
}
if (m_queue_semaphore) {
if (!CloseHandle (m_queue_semaphore)) {
DEBUG_MIDI ("WinMMEMidiOut Unable to close queue semaphore\n");
success = false;
} else {
m_queue_semaphore = 0;
}
}
m_handle = 0;
return success;
}
bool
WinMMEMidiOutputDevice::set_device_name (UINT index)
{
MIDIOUTCAPS capabilities;
MMRESULT result =
midiOutGetDevCaps (index, &capabilities, sizeof(capabilities));
if (result != MMSYSERR_NOERROR) {
DEBUG_MIDI (get_error_string (result));
m_name = "Unknown Midi Output Device";
return false;
} else {
m_name = capabilities.szPname;
}
return true;
}
std::string
WinMMEMidiOutputDevice::get_error_string (MMRESULT error_code)
{
char error_msg[MAXERRORLENGTH];
MMRESULT result = midiOutGetErrorText (error_code, error_msg, MAXERRORLENGTH);
if (result != MMSYSERR_NOERROR) {
return error_msg;
}
return "WinMMEMidiOutput: Unknown Error code";
}
bool
WinMMEMidiOutputDevice::start ()
{
if (m_thread_running) {
DEBUG_MIDI (
string_compose ("WinMMEMidiOutput: device %1 already started\n", m_name));
return true;
}
m_timer = CreateWaitableTimer (NULL, FALSE, NULL);
if (!m_timer) {
DEBUG_MIDI ("WinMMEMidiOutput: unable to create waitable timer\n");
return false;
}
if (!start_midi_output_thread ()) {
DEBUG_MIDI ("WinMMEMidiOutput: Failed to start MIDI output thread\n");
if (!CloseHandle (m_timer)) {
DEBUG_MIDI ("WinMMEMidiOutput: unable to close waitable timer\n");
}
return false;
}
return true;
}
bool
WinMMEMidiOutputDevice::stop ()
{
if (!m_thread_running) {
DEBUG_MIDI ("WinMMEMidiOutputDevice: device already stopped\n");
return true;
}
if (!stop_midi_output_thread ()) {
DEBUG_MIDI ("WinMMEMidiOutput: Failed to start MIDI output thread\n");
return false;
}
if (!CloseHandle (m_timer)) {
DEBUG_MIDI ("WinMMEMidiOutput: unable to close waitable timer\n");
return false;
}
m_timer = 0;
return true;
}
bool
WinMMEMidiOutputDevice::start_midi_output_thread ()
{
m_thread_quit = false;
//pthread_attr_t attr;
size_t stacksize = 100000;
// TODO Use native threads
if (_realtime_pthread_create (SCHED_FIFO, -21, stacksize,
&m_output_thread_handle, midi_output_thread, this)) {
return false;
}
int timeout = 5000;
while (!m_thread_running && --timeout > 0) { Glib::usleep (1000); }
if (timeout == 0 || !m_thread_running) {
DEBUG_MIDI (string_compose ("Unable to start midi output device thread: %1\n",
m_name));
return false;
}
return true;
}
bool
WinMMEMidiOutputDevice::stop_midi_output_thread ()
{
int timeout = 5000;
m_thread_quit = true;
while (m_thread_running && --timeout > 0) { Glib::usleep (1000); }
if (timeout == 0 || m_thread_running) {
DEBUG_MIDI (string_compose ("Unable to stop midi output device thread: %1\n",
m_name));
return false;
}
void *status;
if (pthread_join (m_output_thread_handle, &status)) {
DEBUG_MIDI (string_compose ("Unable to join midi output device thread: %1\n",
m_name));
return false;
}
return true;
}
bool
WinMMEMidiOutputDevice::signal (HANDLE semaphore)
{
bool result = (bool)ReleaseSemaphore (semaphore, 1, NULL);
if (!result) {
DEBUG_MIDI ("WinMMEMidiOutDevice: Cannot release semaphore\n");
}
return result;
}
bool
WinMMEMidiOutputDevice::wait (HANDLE semaphore)
{
DWORD result = WaitForSingleObject (semaphore, INFINITE);
switch (result) {
case WAIT_FAILED:
DEBUG_MIDI ("WinMMEMidiOutDevice: WaitForSingleObject Failed\n");
break;
case WAIT_OBJECT_0:
return true;
default:
DEBUG_MIDI ("WinMMEMidiOutDevice: Unexpected result from WaitForSingleObject\n");
}
return false;
}
void CALLBACK
WinMMEMidiOutputDevice::winmm_output_callback (HMIDIOUT handle,
UINT msg,
DWORD_PTR instance,
DWORD_PTR midi_data,
DWORD_PTR timestamp)
{
((WinMMEMidiOutputDevice*)instance)
->midi_output_callback (msg, midi_data, timestamp);
}
void
WinMMEMidiOutputDevice::midi_output_callback (UINT message,
DWORD_PTR midi_data,
DWORD_PTR timestamp)
{
switch (message) {
case MOM_CLOSE:
DEBUG_MIDI ("WinMMEMidiOutput - MIDI device closed\n");
break;
case MOM_DONE:
signal (m_sysex_semaphore);
break;
case MOM_OPEN:
DEBUG_MIDI ("WinMMEMidiOutput - MIDI device opened\n");
break;
case MOM_POSITIONCB:
LPMIDIHDR header = (LPMIDIHDR)midi_data;
DEBUG_MIDI (string_compose ("WinMMEMidiOut - %1 bytes out of %2 bytes of "
"the current sysex message have been sent.\n",
header->dwOffset,
header->dwBytesRecorded));
}
}
void*
WinMMEMidiOutputDevice::midi_output_thread (void *arg)
{
WinMMEMidiOutputDevice* output_device = reinterpret_cast<WinMMEMidiOutputDevice*> (arg);
output_device->midi_output_thread ();
return 0;
}
void
WinMMEMidiOutputDevice::midi_output_thread ()
{
m_thread_running = true;
DEBUG_MIDI ("WinMMEMidiOut: MIDI output thread started\n");
while (!m_thread_quit) {
if (!wait (m_queue_semaphore)) {
break;
}
MidiEventHeader h (0, 0);
uint8_t data[MAX_MIDI_MSG_SIZE];
const uint32_t read_space = m_midi_buffer->read_space ();
if (read_space > sizeof(MidiEventHeader)) {
if (m_midi_buffer->read ((uint8_t*)&h, sizeof(MidiEventHeader)) !=
sizeof(MidiEventHeader)) {
DEBUG_MIDI ("WinMMEMidiOut: Garbled MIDI EVENT HEADER!!\n");
break;
}
assert (read_space >= h.size);
if (h.size > MAX_MIDI_MSG_SIZE) {
m_midi_buffer->increment_read_idx (h.size);
DEBUG_MIDI ("WinMMEMidiOut: MIDI event too large!\n");
continue;
}
if (m_midi_buffer->read (&data[0], h.size) != h.size) {
DEBUG_MIDI ("WinMMEMidiOut: Garbled MIDI EVENT DATA!!\n");
break;
}
} else {
// error/assert?
DEBUG_MIDI ("WinMMEMidiOut: MIDI buffer underrun, shouldn't occur\n");
continue;
}
uint64_t current_time = utils::get_microseconds ();
DEBUG_TIMING (string_compose (
"WinMMEMidiOut: h.time = %1, current_time = %2\n", h.time, current_time));
if (h.time > current_time) {
DEBUG_TIMING (string_compose ("WinMMEMidiOut: waiting at %1 for %2 "
"milliseconds before sending message\n",
((double)current_time) / 1000.0,
((double)(h.time - current_time)) / 1000.0));
if (!wait_for_microseconds (h.time - current_time))
{
DEBUG_MIDI ("WinMMEMidiOut: Error waiting for timer\n");
break;
}
uint64_t wakeup_time = utils::get_microseconds ();
DEBUG_TIMING (string_compose ("WinMMEMidiOut: woke up at %1(ms)\n",
((double)wakeup_time) / 1000.0));
if (wakeup_time > h.time) {
DEBUG_TIMING (string_compose ("WinMMEMidiOut: overslept by %1(ms)\n",
((double)(wakeup_time - h.time)) / 1000.0));
} else if (wakeup_time < h.time) {
DEBUG_TIMING (string_compose ("WinMMEMidiOut: woke up %1(ms) too early\n",
((double)(h.time - wakeup_time)) / 1000.0));
}
} else if (h.time < current_time) {
DEBUG_TIMING (string_compose (
"WinMMEMidiOut: MIDI event at sent to driver %1(ms) late\n",
((double)(current_time - h.time)) / 1000.0));
}
DWORD message = 0;
MMRESULT result;
switch (h.size) {
case 3:
message |= (((DWORD)data[2]) << 16);
// Fallthrough on purpose.
case 2:
message |= (((DWORD)data[1]) << 8);
// Fallthrough on purpose.
case 1:
message |= (DWORD)data[0];
result = midiOutShortMsg (m_handle, message);
if (result != MMSYSERR_NOERROR) {
DEBUG_MIDI (
string_compose ("WinMMEMidiOutput: %1\n", get_error_string (result)));
}
continue;
}
#if ENABLE_SYSEX
MIDIHDR header;
header.dwBufferLength = h.size;
header.dwFlags = 0;
header.lpData = (LPSTR)data;
result = midiOutPrepareHeader (m_handle, &header, sizeof(MIDIHDR));
if (result != MMSYSERR_NOERROR) {
DEBUG_MIDI (string_compose ("WinMMEMidiOutput: midiOutPrepareHeader %1\n",
get_error_string (result)));
continue;
}
result = midiOutLongMsg (m_handle, &header, sizeof(MIDIHDR));
if (result != MMSYSERR_NOERROR) {
DEBUG_MIDI (string_compose ("WinMMEMidiOutput: midiOutLongMsg %1\n",
get_error_string (result)));
continue;
}
// Sysex messages may be sent synchronously or asynchronously. The
// choice is up to the WinMME driver. So, we wait until the message is
// sent, regardless of the driver's choice.
if (!wait (m_sysex_semaphore)) {
break;
}
result = midiOutUnprepareHeader (m_handle, &header, sizeof(MIDIHDR));
if (result != MMSYSERR_NOERROR) {
DEBUG_MIDI (string_compose ("WinMMEMidiOutput: midiOutUnprepareHeader %1\n",
get_error_string (result)));
break;
}
#endif
}
m_thread_running = false;
}
bool
WinMMEMidiOutputDevice::wait_for_microseconds (int64_t wait_us)
{
LARGE_INTEGER due_time;
// 100 ns resolution
due_time.QuadPart = -((LONGLONG)(wait_us * 10));
if (!SetWaitableTimer (m_timer, &due_time, 0, NULL, NULL, 0)) {
DEBUG_MIDI ("WinMMEMidiOut: Error waiting for timer\n");
return false;
}
if (!wait (m_timer)) {
return false;
}
return true;
}
} // namespace ARDOUR
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