161 lines
3.8 KiB
C++
161 lines
3.8 KiB
C++
// ------------------------------------------------------------------------
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// audioio-loop.cpp: Audio object that routes data between reads and writes
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// Copyright (C) 2000-2001,2004,2007,2008 Kai Vehmanen
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//
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// Attributes:
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// eca-style-version: 3
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//
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// This program is free software; you can redistribute it and/or modify
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// it under the terms of the GNU General Public License as published by
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// the Free Software Foundation; either version 2 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU General Public License for more details.
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//
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// You should have received a copy of the GNU General Public License
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// along with this program; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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// ------------------------------------------------------------------------
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#include <cstdlib>
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#include <string>
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#include <kvu_dbc.h>
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#include <kvu_numtostr.h>
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#include "samplebuffer.h"
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#include "sample-specs.h"
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#include "audioio-buffered.h"
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#include "audioio-loop.h"
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#include "eca-error.h"
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#include "eca-logger.h"
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using std::string;
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LOOP_DEVICE::LOOP_DEVICE(string tag)
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: AUDIO_IO("loop", io_readwrite),
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tag_rep(tag),
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sbuf(buffersize(), 0)
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{
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writes_rep = 0;
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registered_inputs_rep = 0;
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registered_outputs_rep = 0;
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filled_rep = false;
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finished_rep = false;
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empty_rounds_rep = 0;
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}
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LOOP_DEVICE::~LOOP_DEVICE(void)
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{
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if (is_open() == true) {
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close();
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}
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}
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LOOP_DEVICE* LOOP_DEVICE::clone(void) const
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{
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LOOP_DEVICE* target = new LOOP_DEVICE();
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for(int n = 0; n < number_of_params(); n++) {
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target->set_parameter(n + 1, get_parameter(n + 1));
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}
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return target;
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}
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bool LOOP_DEVICE::finished(void) const
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{
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return finished_rep;
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}
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SAMPLE_SPECS::sample_pos_t LOOP_DEVICE::seek_position(SAMPLE_SPECS::sample_pos_t pos)
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{
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writes_rep = 0;
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empty_rounds_rep = 0;
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filled_rep = false;
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finished_rep = false;
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return pos;
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}
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void LOOP_DEVICE::read_buffer(SAMPLE_BUFFER* buffer)
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{
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if (empty_rounds_rep == 0) {
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if (filled_rep == true) {
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buffer->copy_all_content(sbuf);
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/* note: read_buffer() should never be called in the middle
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* of the 'X * write_buffer()' sequence (where X is the number
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* of chain outputs connected to this loop device */
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DBC_CHECK(writes_rep == 0);
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}
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else {
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buffer->number_of_channels(channels());
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buffer->make_silent();
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}
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}
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else {
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finished_rep = true;
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buffer->number_of_channels(channels());
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buffer->make_silent();
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}
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DBC_ENSURE(buffer->number_of_channels() == channels());
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}
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void LOOP_DEVICE::write_buffer(SAMPLE_BUFFER* buffer)
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{
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++writes_rep;
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/* first write of a new engine iteration (and after a read) */
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if (writes_rep == 1) {
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change_position_in_samples(buffer->length_in_samples());
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extend_position();
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sbuf.number_of_channels(channels());
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sbuf.make_silent();
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}
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/* check if this is the last write for this engine iteration */
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if (writes_rep == registered_outputs_rep)
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writes_rep = 0;
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/* store data from 'buffer' */
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if (buffer->is_empty() != true) {
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empty_rounds_rep = 0;
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sbuf.add_with_weight(*buffer, registered_outputs_rep);
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filled_rep = true;
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}
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/* empty 'buffer' */
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else {
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++empty_rounds_rep;
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}
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DBC_CHECK(sbuf.number_of_channels() == channels());
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}
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void LOOP_DEVICE::set_parameter(int param,
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string value)
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{
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switch (param) {
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case 1:
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AUDIO_IO::set_parameter(param, value);
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break;
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case 2:
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tag_rep = value;
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break;
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}
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}
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string LOOP_DEVICE::get_parameter(int param) const
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{
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switch (param) {
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case 1:
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return AUDIO_IO::get_parameter(param);
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case 2:
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return tag_rep;
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}
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return "";
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}
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