13
0
livetrax/libs/ardour/fixed_delay.cc

155 lines
4.0 KiB
C++

/*
* Copyright (C) 2016 Robin Gareus <robin@gareus.org>
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "ardour/audio_buffer.h"
#include "ardour/buffer_set.h"
#include "ardour/fixed_delay.h"
#include "ardour/midi_buffer.h"
using namespace ARDOUR;
FixedDelay::FixedDelay ()
: _max_delay (0)
, _buf_size (0)
, _delay (0)
{
for (size_t i = 0; i < DataType::num_types; ++i) {
_buffers.push_back (BufferVec ());
}
_count.reset ();
}
FixedDelay::~FixedDelay ()
{
clear ();
}
void
FixedDelay::ensure_buffers (DataType type, size_t num_buffers, size_t buffer_capacity)
{
assert (type != DataType::NIL);
assert (type < _buffers.size ());
if (num_buffers == 0) {
return;
}
BufferVec& bufs = _buffers[type];
if (bufs.size () < num_buffers || (bufs.size () > 0 && bufs[0]->buf->capacity () < buffer_capacity)) {
for (BufferVec::iterator i = bufs.begin (); i != bufs.end (); ++i) {
delete (*i);
}
bufs.clear ();
for (size_t i = 0; i < num_buffers; ++i) {
bufs.push_back (new DelayBuffer (type, buffer_capacity));
}
_count.set (type, num_buffers);
}
}
void
FixedDelay::clear ()
{
for (std::vector<BufferVec>::iterator i = _buffers.begin (); i != _buffers.end (); ++i) {
for (BufferVec::iterator j = (*i).begin (); j != (*i).end (); ++j) {
delete *j;
}
(*i).clear ();
}
_buffers.clear ();
_count.reset ();
}
void
FixedDelay::flush()
{
for (std::vector<BufferVec>::iterator i = _buffers.begin (); i != _buffers.end (); ++i) {
for (BufferVec::iterator j = (*i).begin (); j != (*i).end (); ++j) {
(*j)->buf->silence (_buf_size);
}
}
}
void
FixedDelay::configure (const ChanCount& count, framecnt_t max_delay, bool shrink)
{
if (shrink) {
if (max_delay == _max_delay && count == _count) {
return;
}
_max_delay = max_delay;
} else if (max_delay <= _max_delay || count <= _count) {
return;
_max_delay = std::max (_max_delay, max_delay);
}
// max possible (with all engines and during export)
static const framecnt_t max_block_length = 8192;
_buf_size = _max_delay + max_block_length;
for (DataType::iterator i = DataType::begin (); i != DataType::end (); ++i) {
ensure_buffers (*i, count.get (*i), _buf_size);
}
}
void
FixedDelay::set (const ChanCount& count, framecnt_t delay)
{
configure (count, delay, false);
if (_delay != delay) {
flush ();
}
_delay = delay;
}
void
FixedDelay::delay (
ARDOUR::DataType dt, uint32_t id,
Buffer& out, const Buffer& in,
pframes_t n_frames,
framecnt_t dst_offset, framecnt_t src_offset)
{
if (_delay == 0) {
out.read_from (in, n_frames, dst_offset, src_offset);
return;
}
assert (dt < _buffers.size ());
assert (id < _buffers[dt].size ());
DelayBuffer *db = _buffers[dt][id];
if (db->pos + n_frames > _buf_size) {
uint32_t w0 = _buf_size - db->pos;
uint32_t w1 = db->pos + n_frames - _buf_size;
db->buf->read_from (in, w0, db->pos, src_offset);
db->buf->read_from (in, w1, 0, src_offset + w0);
} else {
db->buf->read_from (in, n_frames, db->pos, src_offset);
}
uint32_t rp = (db->pos + _buf_size - _delay) % _buf_size;
if (rp + n_frames > _buf_size) {
uint32_t r0 = _buf_size - rp;
uint32_t r1 = rp + n_frames - _buf_size;
out.read_from (*db->buf, r0, dst_offset, rp);
out.read_from (*db->buf, r1, dst_offset + r0, 0);
} else {
out.read_from (*db->buf, n_frames, dst_offset, rp);
}
db->pos = (db->pos + n_frames) % _buf_size;
}