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.
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 //cerr << "MRB read " << start << " .. " << end << " + " << offset << endl;
48 while (this->read_space() >= sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
50 this->full_peek(sizeof(T), (uint8_t*)&ev_time);
53 //cerr << "MRB event @ " << ev_time << " past end @ " << end << endl;
55 } else if (ev_time < start) {
56 //cerr << "MRB event @ " << ev_time << " before start @ " << start << endl;
60 bool success = read_prefix(&ev_time, &ev_type, &ev_size);
62 cerr << "WARNING: error reading event prefix from MIDI ring" << endl;
66 // This event marks a loop end (i.e. the next event's timestamp will be non-monotonic)
67 if (ev_type == LoopEventType) {
70 cerr << "MRB loop boundary @ " << ev_time << endl;*/
72 // Return without reading data or writing to buffer (loop events have no data)
73 // FIXME: This is not correct, loses events after the loop this cycle
78 success = this->full_peek(sizeof(uint8_t), &status);
79 assert(success); // If this failed, buffer is corrupt, all hope is lost
81 // Ignore event if it doesn't match channel filter
82 if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
83 const uint8_t channel = status & 0x0F;
84 if (!(get_channel_mask() & (1L << channel))) {
85 //cerr << "MRB skipping event due to channel mask" << endl;
86 this->skip(ev_size); // Advance read pointer to next event
91 /*cerr << "MRB " << this << " - Reading event, time = "
92 << ev_time << " - " << start << " => " << ev_time - start
93 << ", size = " << ev_size << endl;*/
95 assert(ev_time >= start);
99 // write the timestamp to address (write_loc - 1)
100 uint8_t* write_loc = dst.reserve(ev_time, ev_size);
101 if (write_loc == NULL) {
102 cerr << "MRB: Unable to reserve space in buffer, event skipped";
106 // write MIDI buffer contents
107 success = Evoral::EventRingBuffer<T>::full_read(ev_size, write_loc);
109 /*cerr << "wrote MidiEvent to Buffer: ";
110 for (size_t i=0; i < ev_size; ++i) {
111 printf("%X ", write_loc[i]);
116 if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
117 write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
121 cerr << "WARNING: error reading event contents from MIDI ring" << endl;
128 template class MidiRingBuffer<nframes_t>;
130 } // namespace ARDOUR