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"
25 /** Read a block of MIDI events from buffer.
27 * Timestamps of events returned are relative to start (i.e. event with stamp 0
28 * occurred at start), with offset added.
31 MidiRingBuffer::read(MidiBuffer& dst, nframes_t start, nframes_t end, nframes_t offset)
33 if (read_space() == 0) {
34 //std::cerr << "MRB: NO READ SPACE" << std::endl;
38 Evoral::EventTime ev_time;
39 Evoral::EventType ev_type;
44 //std::cerr << "MRB read " << start << " .. " << end << " + " << offset << std::endl;
46 while (read_space() >= sizeof(Evoral::EventTime) + sizeof(Evoral::EventType) + sizeof(uint32_t)) {
48 full_peek(sizeof(Evoral::EventTime), (uint8_t*)&ev_time);
51 //std::cerr << "MRB: PAST END (" << ev_time << " : " << end << ")" << std::endl;
53 } else if (ev_time < start) {
54 //std::cerr << "MRB (start " << start << ") - Skipping event at (too early) time " << ev_time << std::endl;
58 bool success = read_prefix(&ev_time, &ev_type, &ev_size);
60 std::cerr << "WARNING: error reading event prefix from MIDI ring" << std::endl;
64 // This event marks a loop happening. this means that
65 // the next events timestamp will be non-monotonic.
66 if (ev_type == LoopEventType) {
69 Evoral::MIDIEvent loopevent(LoopEventType, ev_time);
70 dst.push_back(loopevent);
73 // We can safely return, without reading the data, because
74 // a LoopEvent does not have data.
79 success = full_peek(sizeof(uint8_t), &status);
80 assert(success); // If this failed, buffer is corrupt, all hope is lost
82 // Ignore event if it doesn't match channel filter
83 if (is_channel_event(status) && get_channel_mode() == FilterChannels) {
84 const uint8_t channel = status & 0x0F;
85 if ( !(get_channel_mask() & (1L << channel)) ) {
86 //std::cerr << "MRB skipping event due to channel mask" << std::endl;
87 skip(ev_size); // Advance read pointer to next event
92 //std::cerr << "MRB " << this << " - Reading event, time = "
93 // << ev_time << " - " << start << " => " << ev_time - start
94 // << ", size = " << ev_size << std::endl;
96 assert(ev_time >= start);
100 uint8_t* write_loc = dst.reserve(ev_time, ev_size);
101 if (write_loc == NULL) {
102 //std::cerr << "MRB: Unable to reserve space in buffer, event skipped";
106 success = Evoral::EventRingBuffer::full_read(ev_size, write_loc);
109 if (is_channel_event(status) && get_channel_mode() == ForceChannel) {
110 write_loc[0] = (write_loc[0] & 0xF0) | (get_channel_mask() & 0x0F);
113 //std::cerr << "MRB - read event at time " << ev_time << std::endl;
115 std::cerr << "WARNING: error reading event contents from MIDI ring" << std::endl;
119 //std::cerr << "MTB read space: " << read_space() << std::endl;
125 } // namespace ARDOUR