245 lines
6.4 KiB
C++
245 lines
6.4 KiB
C++
/*
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* Copyright (C) 2014 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
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <unistd.h>
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#include <glibmm.h>
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#include "alsa_midi.h"
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#include "rt_thread.h"
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#include "pbd/error.h"
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#include "i18n.h"
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using namespace ARDOUR;
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#ifndef NDEBUG
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#define _DEBUGPRINT(STR) fprintf(stderr, STR);
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#else
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#define _DEBUGPRINT(STR) ;
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#endif
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AlsaMidiIO::AlsaMidiIO ()
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: _state (-1)
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, _running (false)
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, _pfds (0)
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, _sample_length_us (1e6 / 48000.0)
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, _period_length_us (1.024e6 / 48000.0)
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, _samples_per_period (1024)
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, _rb (0)
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{
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pthread_mutex_init (&_notify_mutex, 0);
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pthread_cond_init (&_notify_ready, 0);
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// MIDI (hw port) 31.25 kbaud
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// worst case here is 8192 SPP and 8KSPS for which we'd need
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// 4000 bytes sans MidiEventHeader.
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// since we're not always in sync, let's use 4096.
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_rb = new RingBuffer<uint8_t>(4096 + 4096 * sizeof(MidiEventHeader));
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}
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AlsaMidiIO::~AlsaMidiIO ()
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{
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delete _rb;
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pthread_mutex_destroy (&_notify_mutex);
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pthread_cond_destroy (&_notify_ready);
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free (_pfds);
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}
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static void * pthread_process (void *arg)
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{
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AlsaMidiIO *d = static_cast<AlsaMidiIO *>(arg);
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d->main_process_thread ();
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pthread_exit (0);
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return 0;
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}
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int
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AlsaMidiIO::start ()
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{
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if (_realtime_pthread_create (SCHED_FIFO, -21, 100000,
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&_main_thread, pthread_process, this))
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{
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if (pthread_create (&_main_thread, NULL, pthread_process, this)) {
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PBD::error << _("AlsaMidiIO: Failed to create process thread.") << endmsg;
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return -1;
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} else {
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PBD::warning << _("AlsaMidiIO: Cannot acquire realtime permissions.") << endmsg;
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}
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}
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int timeout = 5000;
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while (!_running && --timeout > 0) { Glib::usleep (1000); }
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if (timeout == 0 || !_running) {
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return -1;
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}
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return 0;
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}
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int
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AlsaMidiIO::stop ()
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{
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void *status;
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if (!_running) {
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return 0;
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}
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_running = false;
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pthread_mutex_lock (&_notify_mutex);
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pthread_cond_signal (&_notify_ready);
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pthread_mutex_unlock (&_notify_mutex);
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if (pthread_join (_main_thread, &status)) {
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PBD::error << _("AlsaMidiIO: Failed to terminate.") << endmsg;
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return -1;
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}
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return 0;
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}
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void
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AlsaMidiIO::setup_timing (const size_t samples_per_period, const float samplerate)
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{
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_period_length_us = (double) samples_per_period * 1e6 / samplerate;
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_sample_length_us = 1e6 / samplerate;
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_samples_per_period = samples_per_period;
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}
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void
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AlsaMidiIO::sync_time (const uint64_t tme)
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{
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// TODO consider a PLL, if this turns out to be the bottleneck for jitter
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// also think about using
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// snd_pcm_status_get_tstamp() and snd_rawmidi_status_get_tstamp()
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// instead of monotonic clock.
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#ifdef DEBUG_TIMING
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double tdiff = (_clock_monotonic + _period_length_us - tme) / 1000.0;
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if (abs(tdiff) >= .05) {
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printf("AlsaMidiIO MJ: %.1f ms\n", tdiff);
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}
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#endif
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_clock_monotonic = tme;
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}
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///////////////////////////////////////////////////////////////////////////////
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AlsaMidiOut::AlsaMidiOut ()
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: AlsaMidiIO ()
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{
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}
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int
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AlsaMidiOut::send_event (const pframes_t time, const uint8_t *data, const size_t size)
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{
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const uint32_t buf_size = sizeof (MidiEventHeader) + size;
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if (_rb->write_space() < buf_size) {
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_DEBUGPRINT("AlsaMidiOut: ring buffer overflow\n");
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return -1;
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}
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struct MidiEventHeader h (_clock_monotonic + time * _sample_length_us, size);
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_rb->write ((uint8_t*) &h, sizeof(MidiEventHeader));
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_rb->write (data, size);
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if (pthread_mutex_trylock (&_notify_mutex) == 0) {
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pthread_cond_signal (&_notify_ready);
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pthread_mutex_unlock (&_notify_mutex);
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}
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return 0;
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}
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///////////////////////////////////////////////////////////////////////////////
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AlsaMidiIn::AlsaMidiIn ()
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: AlsaMidiIO ()
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{
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}
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size_t
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AlsaMidiIn::recv_event (pframes_t &time, uint8_t *data, size_t &size)
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{
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const uint32_t read_space = _rb->read_space();
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struct MidiEventHeader h(0,0);
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if (read_space <= sizeof(MidiEventHeader)) {
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return 0;
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}
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RingBuffer<uint8_t>::rw_vector vector;
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_rb->get_read_vector(&vector);
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if (vector.len[0] >= sizeof(MidiEventHeader)) {
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memcpy((uint8_t*)&h, vector.buf[0], sizeof(MidiEventHeader));
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} else {
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if (vector.len[0] > 0) {
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memcpy ((uint8_t*)&h, vector.buf[0], vector.len[0]);
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}
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assert(vector.buf[1] || vector.len[0] == sizeof(MidiEventHeader));
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memcpy (((uint8_t*)&h) + vector.len[0], vector.buf[1], sizeof(MidiEventHeader) - vector.len[0]);
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}
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if (h.time >= _clock_monotonic + _period_length_us ) {
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#ifdef DEBUG_TIMING
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printf("AlsaMidiIn DEBUG: POSTPONE EVENT TO NEXT CYCLE: %.1f spl\n", ((h.time - _clock_monotonic) / _sample_length_us));
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#endif
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return 0;
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}
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_rb->increment_read_idx (sizeof(MidiEventHeader));
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assert (h.size > 0);
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if (h.size > size) {
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_DEBUGPRINT("AlsaMidiIn::recv_event MIDI event too large!\n");
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_rb->increment_read_idx (h.size);
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return 0;
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}
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if (_rb->read (&data[0], h.size) != h.size) {
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_DEBUGPRINT("AlsaMidiIn::recv_event Garbled MIDI EVENT DATA!!\n");
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return 0;
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}
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if (h.time < _clock_monotonic) {
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#ifdef DEBUG_TIMING
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printf("AlsaMidiIn DEBUG: MIDI TIME < 0 %.1f spl\n", ((_clock_monotonic - h.time) / -_sample_length_us));
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#endif
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time = 0;
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} else if (h.time >= _clock_monotonic + _period_length_us ) {
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#ifdef DEBUG_TIMING
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printf("AlsaMidiIn DEBUG: MIDI TIME > PERIOD %.1f spl\n", ((h.time - _clock_monotonic) / _sample_length_us));
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#endif
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time = _samples_per_period - 1;
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} else {
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time = floor ((h.time - _clock_monotonic) / _sample_length_us);
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}
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assert(time < _samples_per_period);
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size = h.size;
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return h.size;
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}
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int
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AlsaMidiIn::queue_event (const uint64_t time, const uint8_t *data, const size_t size) {
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const uint32_t buf_size = sizeof(MidiEventHeader) + size;
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if (size == 0) {
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return -1;
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}
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if (_rb->write_space() < buf_size) {
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_DEBUGPRINT("AlsaMidiIn: ring buffer overflow\n");
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return -1;
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}
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struct MidiEventHeader h (time, size);
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_rb->write ((uint8_t*) &h, sizeof(MidiEventHeader));
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_rb->write (data, size);
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return 0;
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}
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