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livetrax/libs/ardour/midi_ring_buffer.cc

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/*
Copyright (C) 2006-2008 Paul Davis
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#include "pbd/compose.h"
#include "pbd/enumwriter.h"
#include "pbd/error.h"
#include "ardour/debug.h"
#include "ardour/midi_ring_buffer.h"
#include "ardour/midi_buffer.h"
#include "ardour/event_type_map.h"
using namespace std;
using namespace PBD;
namespace ARDOUR {
/** Read a block of MIDI events from this buffer into a MidiBuffer.
*
* Timestamps of events returned are relative to start (i.e. event with stamp 0
* occurred at start), with offset added.
*/
template<typename T>
size_t
MidiRingBuffer<T>::read(MidiBuffer& dst, framepos_t start, framepos_t end, framecnt_t offset, bool stop_on_overflow_in_dst)
{
if (this->read_space() == 0) {
return 0;
}
T ev_time;
uint32_t ev_size;
size_t count = 0;
const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
while (this->read_space() >= prefix_size) {
uint8_t peekbuf[prefix_size];
/* this cannot fail, because we've already verified that there
is prefix_space to read
*/
this->peek (peekbuf, prefix_size);
ev_time = *(reinterpret_cast<T*>((uintptr_t)peekbuf));
ev_size = *(reinterpret_cast<uint32_t*>((uintptr_t)(peekbuf + sizeof(T) + sizeof (Evoral::EventType))));
if (this->read_space() < ev_size) {
break;;
}
if (ev_time >= end) {
DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 past end @ %2\n", ev_time, end));
break;
} else if (ev_time < start) {
DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 before start @ %2\n", ev_time, start));
break;
} else {
DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MRB event @ %1 in range %2 .. %3\n", ev_time, start, end));
}
ev_time -= start;
ev_time += offset;
/* we're good to go ahead and read the data now but since we
* have the prefix data already, just skip over that
*/
this->increment_read_ptr (prefix_size);
uint8_t status;
bool r = this->peek (&status, sizeof(uint8_t));
assert (r); // If this failed, buffer is corrupt, all hope is lost
/* lets see if we are going to be able to write this event into dst.
*/
uint8_t* write_loc = dst.reserve (ev_time, ev_size);
if (write_loc == 0) {
if (stop_on_overflow_in_dst) {
DEBUG_TRACE (DEBUG::MidiDiskstreamIO, string_compose ("MidiRingBuffer: overflow in destination MIDI buffer, stopped after %1 events\n", count));
break;
}
error << "MRB: Unable to reserve space in buffer, event skipped" << endmsg;
this->increment_read_ptr (ev_size); // Advance read pointer to next event
continue;
}
// write MIDI buffer contents
bool success = read_contents (ev_size, write_loc);
#ifndef NDEBUG
if (DEBUG_ENABLED (DEBUG::MidiDiskstreamIO)) {
DEBUG_STR_DECL(a);
DEBUG_STR_APPEND(a, string_compose ("wrote MidiEvent to Buffer (time=%1, start=%2 offset=%3)", ev_time, start, offset));
for (size_t i=0; i < ev_size; ++i) {
DEBUG_STR_APPEND(a,hex);
DEBUG_STR_APPEND(a,"0x");
DEBUG_STR_APPEND(a,(int)write_loc[i]);
DEBUG_STR_APPEND(a,' ');
}
DEBUG_STR_APPEND(a,'\n');
DEBUG_TRACE (DEBUG::MidiDiskstreamIO, DEBUG_STR(a).str());
}
#endif
if (success) {
_tracker.track(write_loc);
++count;
} else {
cerr << "WARNING: error reading event contents from MIDI ring" << endl;
}
}
return count;
}
template<typename T>
size_t
MidiRingBuffer<T>::skip_to(framepos_t start)
{
if (this->read_space() == 0) {
return 0;
}
T ev_time;
uint32_t ev_size;
size_t count = 0;
const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
while (this->read_space() >= prefix_size) {
uint8_t peekbuf[prefix_size];
this->peek (peekbuf, prefix_size);
ev_time = *(reinterpret_cast<T*>((uintptr_t)peekbuf));
ev_size = *(reinterpret_cast<uint32_t*>((uintptr_t)(peekbuf + sizeof(T) + sizeof (Evoral::EventType))));
if (ev_time >= start) {
return count;
}
if (this->read_space() < ev_size) {
continue;
}
this->increment_read_ptr (prefix_size);
uint8_t status;
bool r = this->peek (&status, sizeof(uint8_t));
assert (r); // If this failed, buffer is corrupt, all hope is lost
++count;
/* TODO investigate and think:
*
* Does it makes sense to keep track of notes
* that are skipped (because they're either too late
* (underrun) or never used (read-ahead, loop) ?
*
* skip_to() is called on the rinbuffer between
* disk and process. it seems wrong to track them
* (a potential synth never sees skipped notes, either)
* but there may be more to this.
*/
if (ev_size >= 8) {
this->increment_read_ptr (ev_size);
} else {
// we only track note on/off, 8 bytes are plenty.
uint8_t write_loc[8];
bool success = read_contents (ev_size, write_loc);
if (success) {
_tracker.track(write_loc);
}
}
}
return count;
}
template<typename T>
void
MidiRingBuffer<T>::flush (framepos_t /*start*/, framepos_t end)
{
const size_t prefix_size = sizeof(T) + sizeof(Evoral::EventType) + sizeof(uint32_t);
while (this->read_space() >= prefix_size) {
uint8_t peekbuf[prefix_size];
bool success;
uint32_t ev_size;
T ev_time;
success = this->peek (peekbuf, prefix_size);
/* this cannot fail, because we've already verified that there
is prefix_space to read
*/
assert (success);
ev_time = *(reinterpret_cast<T*>((uintptr_t)peekbuf));
if (ev_time >= end) {
break;
}
ev_size = *(reinterpret_cast<uint32_t*>((uintptr_t)(peekbuf + sizeof(T) + sizeof (Evoral::EventType))));
this->increment_read_ptr (prefix_size);
this->increment_read_ptr (ev_size);
}
}
template<typename T>
void
MidiRingBuffer<T>::dump(ostream& str)
{
size_t rspace;
if ((rspace = this->read_space()) == 0) {
str << "MRB::dump: empty\n";
return;
}
T ev_time;
Evoral::EventType ev_type;
uint32_t ev_size;
RingBufferNPT<uint8_t>::rw_vector vec;
RingBufferNPT<uint8_t>::get_read_vector (&vec);
if (vec.len[0] == 0) {
return;
}
str << this << ": Dump size = " << vec.len[0] + vec.len[1]
<< " r@ " << RingBufferNPT<uint8_t>::get_read_ptr()
<< " w@" << RingBufferNPT<uint8_t>::get_write_ptr() << endl;
uint8_t *buf = new uint8_t[vec.len[0] + vec.len[1]];
memcpy (buf, vec.buf[0], vec.len[0]);
if (vec.len[1]) {
memcpy (buf+vec.len[1], vec.buf[1], vec.len[1]);
}
uint8_t* data = buf;
const uint8_t* end = buf + vec.len[0] + vec.len[1];
while (data < end) {
memcpy (&ev_time, data, sizeof (T));
data += sizeof (T);
str << "\ttime " << ev_time;
if (data >= end) {
str << "(incomplete)\n ";
break;
}
memcpy (&ev_type, data, sizeof (ev_type));
data += sizeof (ev_type);
str << " type " << ev_type;
if (data >= end) {
str << "(incomplete)\n";
break;
}
memcpy (&ev_size, data, sizeof (ev_size));
data += sizeof (ev_size);
str << " size " << ev_size;
if (data >= end) {
str << "(incomplete)\n";
break;
}
for (uint32_t i = 0; i != ev_size && data < end; ++i) {
str << ' ' << hex << (int) data[i] << dec;
}
data += ev_size;
str << endl;
}
delete [] buf;
}
template<typename T>
void
MidiRingBuffer<T>::reset_tracker ()
{
_tracker.reset ();
}
template<typename T>
void
MidiRingBuffer<T>::resolve_tracker (MidiBuffer& dst, framepos_t t)
{
_tracker.resolve_notes (dst, t);
}
template<typename T>
void
MidiRingBuffer<T>::resolve_tracker (Evoral::EventSink<framepos_t>& dst, framepos_t t)
{
_tracker.resolve_notes(dst, t);
}
template class MidiRingBuffer<framepos_t>;
} // namespace ARDOUR
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