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 "pbd/compose.h"
21 #include "ardour/debug.h"
22 #include "ardour/midi_ring_buffer.h"
23 #include "ardour/midi_buffer.h"
24 #include "ardour/event_type_map.h"
27 using namespace ARDOUR;
30 /** Read a block of MIDI events from buffer into a MidiBuffer.
32 * Timestamps of events returned are relative to start (i.e. event with stamp 0
33 * occurred at start), with offset added.
37 MidiRingBuffer<T>::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
39 if (this->read_space() == 0) {
44 Evoral::EventType ev_type;
49 while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
51 this->full_peek(sizeof(T), (uint8_t*)&ev_time);
54 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 past end @ %2\n", ev_time, end));
56 } else if (ev_time < start) {
57 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 before start @ %2\n", ev_time, start));
60 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 in range %2 .. %3\n", ev_time, start, end));
63 bool success = read_prefix(&ev_time, &ev_type, &ev_size);
65 cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
69 // This event marks a loop end (i.e. the next event's timestamp will be non-monotonic)
70 if (ev_type == LoopEventType) {
73 cerr << "MRB loop boundary @ " << ev_time << endl;
75 // Return without reading data or writing to buffer (loop events have no data)
76 // FIXME: This is not correct, loses events after the loop this cycle
81 success = this->full_peek(sizeof(uint8_t), &status);
82 assert(success); // If this failed, buffer is corrupt, all hope is lost
84 // Ignore event if it doesn't match channel filter
85 if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
86 const uint8_t channel = status & 0x0F;
87 if (!(get_channel_mask() & (1L << channel))) {
88 // cerr << "MRB skipping event due to channel mask" << endl;
89 this->skip(ev_size); // Advance read pointer to next event
94 assert(ev_time >= start);
98 // write the timestamp to address (write_loc - 1)
99 uint8_t* write_loc = dst.reserve(ev_time, ev_size);
100 if (write_loc == NULL) {
101 cerr << "MRB: Unable to reserve space in buffer, event skipped";
102 this->skip (ev_size); // Advance read pointer to next event
106 // write MIDI buffer contents
107 success = read_contents (ev_size, write_loc);
111 DEBUG_STR_APPEND(a, string_compose ("wrote MidiEvent to Buffer (time=%1, start=%2 offset=%3)", ev_time, start, offset));
112 for (size_t i=0; i < ev_size; ++i) {
113 DEBUG_STR_APPEND(a,hex);
114 DEBUG_STR_APPEND(a,"0x");
115 DEBUG_STR_APPEND(a,(int)write_loc[i]);
116 DEBUG_STR_APPEND(a,' ');
118 DEBUG_STR_APPEND(a,'\n');
119 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, DEBUG_STR(a).str());
123 if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
124 write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
128 cerr << "WARNING: error reading event contents from MIDI ring" << endl;
136 MidiRingBuffer<T>::dump(ostream& str)
140 if ((rspace = this->read_space()) == 0) {
141 str << "MRB::dump: empty\n";
146 Evoral::EventType ev_type;
148 size_t read_ptr = g_atomic_int_get (&this->_read_ptr);
150 str << "Dump @ " << read_ptr << endl;
157 #define space(r,w) ((w > r) ? (w - r) : ((w - r + this->_size) % this->_size))
159 write_ptr = g_atomic_int_get (&this->_write_ptr);
160 if (space (read_ptr, write_ptr) < sizeof (T)) {
164 wp = &this->_buf[read_ptr];
165 memcpy (&ev_time, wp, sizeof (T));
166 read_ptr = (read_ptr + sizeof (T)) % this->_size;
167 str << "time " << ev_time;
169 write_ptr = g_atomic_int_get (&this->_write_ptr);
170 if (space (read_ptr, write_ptr) < sizeof (ev_type)) {
174 wp = &this->_buf[read_ptr];
175 memcpy (&ev_type, wp, sizeof (ev_type));
176 read_ptr = (read_ptr + sizeof (ev_type)) % this->_size;
177 str << " type " << ev_type;
179 write_ptr = g_atomic_int_get (&this->_write_ptr);
180 if (space (read_ptr, write_ptr) < sizeof (ev_size)) {
185 wp = &this->_buf[read_ptr];
186 memcpy (&ev_size, wp, sizeof (ev_size));
187 read_ptr = (read_ptr + sizeof (ev_size)) % this->_size;
188 str << " size " << ev_size;
190 write_ptr = g_atomic_int_get (&this->_write_ptr);
191 if (space (read_ptr, write_ptr) < ev_size) {
196 data = new uint8_t[ev_size];
198 wp = &this->_buf[read_ptr];
199 memcpy (data, wp, ev_size);
200 read_ptr = (read_ptr + ev_size) % this->_size;
202 for (uint32_t i = 0; i != ev_size; ++i) {
203 str << ' ' << hex << (int) data[i] << dec;
213 template class MidiRingBuffer<nframes_t>;