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"
20 #include "pbd/enumwriter.h"
21 #include "pbd/error.h"
23 #include "ardour/debug.h"
24 #include "ardour/midi_ring_buffer.h"
25 #include "ardour/midi_buffer.h"
26 #include "ardour/event_type_map.h"
33 /** Read a block of MIDI events from this buffer into a MidiBuffer.
35 * Timestamps of events returned are relative to start (i.e. event with stamp 0
36 * occurred at start), with offset added.
40 MidiRingBuffer<T>::read(MidiBuffer& dst, framepos_t start, framepos_t end, framecnt_t offset, bool stop_on_overflow_in_dst)
42 if (this->read_space() == 0) {
49 const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
51 while (this->read_space() >= prefix_size) {
53 uint8_t peekbuf[prefix_size];
55 /* this cannot fail, because we've already verified that there
56 is prefix_space to read
58 this->peek (peekbuf, prefix_size);
60 ev_time = *((T*) peekbuf);
61 ev_size = *((uint32_t*)(peekbuf + sizeof(T) + sizeof (Evoral::EventType)));
64 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 past end @ %2\n", ev_time, end));
66 } else if (ev_time < start) {
67 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 before start @ %2\n", ev_time, start));
70 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 in range %2 .. %3\n", ev_time, start, end));
76 /* we're good to go ahead and read the data now but since we
77 * have the prefix data already, just skip over that
79 this->increment_read_ptr (prefix_size);
82 bool r = this->peek (&status, sizeof(uint8_t));
83 assert (r); // If this failed, buffer is corrupt, all hope is lost
85 /* lets see if we are going to be able to write this event into dst.
87 uint8_t* write_loc = dst.reserve (ev_time, ev_size);
89 if (stop_on_overflow_in_dst) {
90 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MidiRingBuffer: overflow in destination MIDI buffer, stopped after %1 events\n", count));
93 error << "MRB: Unable to reserve space in buffer, event skipped" << endmsg;
94 this->increment_read_ptr (ev_size); // Advance read pointer to next event
98 // write MIDI buffer contents
99 bool success = read_contents (ev_size, write_loc);
102 if (DEBUG::MidiDiskstreamIO && PBD::debug_bits) {
104 DEBUG_STR_APPEND(a, string_compose ("wrote MidiEvent to Buffer (time=%1, start=%2 offset=%3)", ev_time, start, offset));
105 for (size_t i=0; i < ev_size; ++i) {
106 DEBUG_STR_APPEND(a,hex);
107 DEBUG_STR_APPEND(a,"0x");
108 DEBUG_STR_APPEND(a,(int)write_loc[i]);
109 DEBUG_STR_APPEND(a,' ');
111 DEBUG_STR_APPEND(a,'\n');
112 DEBUG_TRACE (DEBUG::MidiDiskstreamIO, DEBUG_STR(a).str());
118 if (is_note_on(write_loc[0]) ) {
119 _tracker.add (write_loc[1], write_loc[0] & 0xf);
120 } else if (is_note_off(write_loc[0])) {
121 _tracker.remove (write_loc[1], write_loc[0] & 0xf);
126 cerr << "WARNING: error reading event contents from MIDI ring" << endl;
135 MidiRingBuffer<T>::flush (framepos_t /*start*/, framepos_t end)
137 const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
139 while (this->read_space() >= prefix_size) {
140 uint8_t peekbuf[prefix_size];
145 success = this->peek (peekbuf, prefix_size);
146 /* this cannot fail, because we've already verified that there
147 is prefix_space to read
151 ev_time = *((T*) peekbuf);
153 if (ev_time >= end) {
157 ev_size = *((uint32_t*)(peekbuf + sizeof(T) + sizeof (Evoral::EventType)));
158 this->increment_read_ptr (prefix_size);
159 this->increment_read_ptr (ev_size);
165 MidiRingBuffer<T>::dump(ostream& str)
169 if ((rspace = this->read_space()) == 0) {
170 str << "MRB::dump: empty\n";
175 Evoral::EventType ev_type;
178 RingBufferNPT<uint8_t>::rw_vector vec;
179 RingBufferNPT<uint8_t>::get_read_vector (&vec);
181 if (vec.len[0] == 0) {
185 str << this << ": Dump size = " << vec.len[0] + vec.len[1]
186 << " r@ " << RingBufferNPT<uint8_t>::get_read_ptr()
187 << " w@" << RingBufferNPT<uint8_t>::get_write_ptr() << endl;
190 uint8_t *buf = new uint8_t[vec.len[0] + vec.len[1]];
191 memcpy (buf, vec.buf[0], vec.len[0]);
194 memcpy (buf+vec.len[1], vec.buf[1], vec.len[1]);
198 const uint8_t* end = buf + vec.len[0] + vec.len[1];
202 memcpy (&ev_time, data, sizeof (T));
204 str << "\ttime " << ev_time;
207 str << "(incomplete)\n ";
211 memcpy (&ev_type, data, sizeof (ev_type));
212 data += sizeof (ev_type);
213 str << " type " << ev_type;
216 str << "(incomplete)\n";
220 memcpy (&ev_size, data, sizeof (ev_size));
221 data += sizeof (ev_size);
222 str << " size " << ev_size;
225 str << "(incomplete)\n";
229 for (uint32_t i = 0; i != ev_size && data < end; ++i) {
230 str << ' ' << hex << (int) data[i] << dec;
243 MidiRingBuffer<T>::reset_tracker ()
250 MidiRingBuffer<T>::loop_resolve (MidiBuffer& dst, framepos_t t)
252 _tracker.resolve_notes (dst, t);
255 template class MidiRingBuffer<framepos_t>;
257 } // namespace ARDOUR