2 Copyright (C) 2006-2008 Paul Davis
4 This program is free software; you can redistribute it and/or modify
5 it under the terms of the GNU General Public License as published by
6 the Free Software Foundation; either version 2 of the License, or
7 (at your option) any later version.
9 This program is distributed in the hope that it will be useful,
10 but WITHOUT ANY WARRANTY; without even the implied warranty of
11 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 GNU General Public License for more details.
14 You should have received a copy of the GNU General Public License
15 along with this program; if not, write to the Free Software
16 Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
19 #include "ardour/midi_ring_buffer.h"
20 #include "ardour/midi_buffer.h"
21 #include "ardour/event_type_map.h"
27 /** Read a block of MIDI events from buffer into a MidiBuffer.
29 * Timestamps of events returned are relative to start (i.e. event with stamp 0
30 * occurred at start), with offset added.
34 MidiRingBuffer<T>::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
36 if (this->read_space() == 0) {
41 Evoral::EventType ev_type;
46 while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
48 this->full_peek(sizeof(T), (uint8_t*)&ev_time);
51 // cerr << "MRB event @ " << ev_time << " past end @ " << end << endl;
53 } else if (ev_time < start) {
54 // cerr << "MRB event @ " << ev_time << " before start @ " << start << endl;
58 bool success = read_prefix(&ev_time, &ev_type, &ev_size);
60 cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
64 // This event marks a loop end (i.e. the next event's timestamp will be non-monotonic)
65 if (ev_type == LoopEventType) {
68 // cerr << "MRB loop boundary @ " << ev_time << endl;
70 // Return without reading data or writing to buffer (loop events have no data)
71 // FIXME: This is not correct, loses events after the loop this cycle
76 success = this->full_peek(sizeof(uint8_t), &status);
77 assert(success); // If this failed, buffer is corrupt, all hope is lost
79 // Ignore event if it doesn't match channel filter
80 if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
81 const uint8_t channel = status & 0x0F;
82 if (!(get_channel_mask() & (1L << channel))) {
83 // cerr << "MRB skipping event due to channel mask" << endl;
84 this->skip(ev_size); // Advance read pointer to next event
89 assert(ev_time >= start);
93 // write the timestamp to address (write_loc - 1)
94 uint8_t* write_loc = dst.reserve(ev_time, ev_size);
95 if (write_loc == NULL) {
96 // cerr << "MRB: Unable to reserve space in buffer, event skipped";
100 // write MIDI buffer contents
101 success = Evoral::EventRingBuffer<T>::full_read(ev_size, write_loc);
104 cerr << "wrote MidiEvent to Buffer: " << hex;
105 for (size_t i=0; i < ev_size; ++i) {
106 cerr << (int) write_loc[i] << ' ';
112 if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
113 write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
117 cerr << "WARNING: error reading event contents from MIDI ring" << endl;
125 MidiRingBuffer<T>::dump(ostream& str)
129 if ((rspace = this->read_space()) == 0) {
130 str << "MRB::dump: empty\n";
135 Evoral::EventType ev_type;
137 size_t read_ptr = g_atomic_int_get (&this->_read_ptr);
139 str << "Dump @ " << read_ptr << endl;
146 #define space(r,w) ((w > r) ? (w - r) : ((w - r + this->_size) % this->_size))
148 write_ptr = g_atomic_int_get (&this->_write_ptr);
149 if (space (read_ptr, write_ptr) < sizeof (T)) {
153 wp = &this->_buf[read_ptr];
154 memcpy (&ev_time, wp, sizeof (T));
155 read_ptr = (read_ptr + sizeof (T)) % this->_size;
156 str << "time " << ev_time;
158 write_ptr = g_atomic_int_get (&this->_write_ptr);
159 if (space (read_ptr, write_ptr) < sizeof (ev_type)) {
163 wp = &this->_buf[read_ptr];
164 memcpy (&ev_type, wp, sizeof (ev_type));
165 read_ptr = (read_ptr + sizeof (ev_type)) % this->_size;
166 str << " type " << ev_type;
168 write_ptr = g_atomic_int_get (&this->_write_ptr);
169 if (space (read_ptr, write_ptr) < sizeof (ev_size)) {
174 wp = &this->_buf[read_ptr];
175 memcpy (&ev_size, wp, sizeof (ev_size));
176 read_ptr = (read_ptr + sizeof (ev_size)) % this->_size;
177 str << " size " << ev_size;
179 write_ptr = g_atomic_int_get (&this->_write_ptr);
180 if (space (read_ptr, write_ptr) < ev_size) {
185 data = new uint8_t[ev_size];
187 wp = &this->_buf[read_ptr];
188 memcpy (data, wp, ev_size);
189 read_ptr = (read_ptr + ev_size) % this->_size;
191 for (uint32_t i = 0; i != ev_size; ++i) {
192 str << ' ' << hex << (int) data[i] << dec;
202 template class MidiRingBuffer<nframes_t>;
204 } // namespace ARDOUR