libs/ardour/port_insert.cc

   1 /*
   2     Copyright (C) 2000,2007 Paul Davis
   3
   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.
   8
   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.
  13
  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.
  17
  18 */
  19
  20 #include <string>
  21
  22
  23 #include "pbd/failed_constructor.h"
  24 #include "pbd/xml++.h"
  25
  26 #include "ardour/audioengine.h"
  27 #include "ardour/audio_port.h"
  28 #include "ardour/buffer_set.h"
  29 #include "ardour/delivery.h"
  30 #include "ardour/mtdm.h"
  31 #include "ardour/plugin.h"
  32 #include "ardour/port.h"
  33 #include "ardour/port_insert.h"
  34 #include "ardour/route.h"
  35 #include "ardour/session.h"
  36 #include "ardour/types.h"
  37
  38 #include "i18n.h"
  39
  40 using namespace std;
  41 using namespace ARDOUR;
  42 using namespace PBD;
  43
  44 PortInsert::PortInsert (Session& s, boost::shared_ptr<Pannable> pannable, boost::shared_ptr<MuteMaster> mm)
  45         : IOProcessor (s, true, true, string_compose (_("insert %1"), (bitslot = s.next_insert_id()) + 1), "")
  46         , _out (new Delivery (s, _output, pannable, mm, _name, Delivery::Insert))
  47 {
  48         _mtdm = 0;
  49         _latency_detect = false;
  50         _latency_flush_frames = false;
  51         _measured_latency = 0;
  52 }
  53
  54 PortInsert::~PortInsert ()
  55 {
  56         _session.unmark_insert_id (bitslot);
  57         delete _mtdm;
  58 }
  59
  60 void
  61 PortInsert::start_latency_detection ()
  62 {
  63         if (_mtdm != 0) {
  64                 delete _mtdm;
  65         }
  66
  67         _mtdm = new MTDM;
  68         _latency_flush_frames = false;
  69         _latency_detect = true;
  70         _measured_latency = 0;
  71 }
  72
  73 void
  74 PortInsert::stop_latency_detection ()
  75 {
  76         _latency_flush_frames = signal_latency() + _session.engine().frames_per_cycle();
  77         _latency_detect = false;
  78 }
  79
  80 void
  81 PortInsert::set_measured_latency (framecnt_t n)
  82 {
  83         _measured_latency = n;
  84 }
  85
  86 framecnt_t
  87 PortInsert::latency() const
  88 {
  89         /* because we deliver and collect within the same cycle,
  90            all I/O is necessarily delayed by at least frames_per_cycle().
  91
  92            if the return port for insert has its own latency, we
  93            need to take that into account too.
  94         */
  95
  96         if (_measured_latency == 0) {
  97                 return _session.engine().frames_per_cycle() + _input->latency();
  98         } else {
  99                 return _measured_latency;
 100         }
 101 }
 102
 103 void
 104 PortInsert::run (BufferSet& bufs, framepos_t start_frame, framepos_t end_frame, pframes_t nframes, bool)
 105 {
 106         if (_output->n_ports().n_total() == 0) {
 107                 return;
 108         }
 109
 110         if (_latency_detect) {
 111
 112                 if (_input->n_ports().n_audio() != 0) {
 113
 114                         AudioBuffer& outbuf (_output->ports().nth_audio_port(0)->get_audio_buffer (nframes));
 115                         Sample* in = _input->ports().nth_audio_port(0)->get_audio_buffer (nframes).data();
 116                         Sample* out = outbuf.data();
 117
 118                         _mtdm->process (nframes, in, out);
 119
 120                         outbuf.is_silent (false);
 121                 }
 122
 123                 return;
 124
 125         } else if (_latency_flush_frames) {
 126
 127                 /* wait for the entire input buffer to drain before picking up input again so that we can't
 128                    hear the remnants of whatever MTDM pumped into the pipeline.
 129                 */
 130
 131                 silence (nframes);
 132
 133                 if (_latency_flush_frames > nframes) {
 134                         _latency_flush_frames -= nframes;
 135                 } else {
 136                         _latency_flush_frames = 0;
 137                 }
 138
 139                 return;
 140         }
 141
 142         if (!_active && !_pending_active) {
 143                 /* deliver silence */
 144                 silence (nframes);
 145                 goto out;
 146         }
 147
 148         _out->run (bufs, start_frame, end_frame, nframes, true);
 149         _input->collect_input (bufs, nframes, ChanCount::ZERO);
 150
 151   out:
 152         _active = _pending_active;
 153 }
 154
 155 XMLNode&
 156 PortInsert::get_state(void)
 157 {
 158         return state (true);
 159 }
 160
 161 XMLNode&
 162 PortInsert::state (bool full)
 163 {
 164         XMLNode& node = IOProcessor::state(full);
 165         char buf[32];
 166         node.add_property ("type", "port");
 167         snprintf (buf, sizeof (buf), "%" PRIu32, bitslot);
 168         node.add_property ("bitslot", buf);
 169         snprintf (buf, sizeof (buf), "%" PRId64, _measured_latency);
 170         node.add_property("latency", buf);
 171         snprintf (buf, sizeof (buf), "%u", _session.get_block_size());
 172         node.add_property("block_size", buf);
 173
 174         return node;
 175 }
 176
 177 int
 178 PortInsert::set_state (const XMLNode& node, int version)
 179 {
 180         XMLNodeList nlist = node.children();
 181         XMLNodeIterator niter;
 182         XMLPropertyList plist;
 183         const XMLProperty *prop;
 184
 185         const XMLNode* insert_node = &node;
 186
 187         // legacy sessions: search for child Redirect node
 188         for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
 189                 if ((*niter)->name() == "Redirect") {
 190                         insert_node = *niter;
 191                         break;
 192                 }
 193         }
 194
 195         IOProcessor::set_state (*insert_node, version);
 196
 197         if ((prop = node.property ("type")) == 0) {
 198                 error << _("XML node describing port insert is missing the `type' field") << endmsg;
 199                 return -1;
 200         }
 201
 202         if (prop->value() != "port") {
 203                 error << _("non-port insert XML used for port plugin insert") << endmsg;
 204                 return -1;
 205         }
 206
 207         uint32_t blocksize = 0;
 208         if ((prop = node.property ("block_size")) != 0) {
 209                 sscanf (prop->value().c_str(), "%u", &blocksize);
 210         }
 211
 212         //if the jack period is the same as when the value was saved, we can recall our latency..
 213         if ( (_session.get_block_size() == blocksize) && (prop = node.property ("latency")) != 0) {
 214                 uint32_t latency = 0;
 215                 sscanf (prop->value().c_str(), "%u", &latency);
 216                 _measured_latency = latency;
 217         }
 218
 219         if ((prop = node.property ("bitslot")) == 0) {
 220                 bitslot = _session.next_insert_id();
 221         } else {
 222                 _session.unmark_insert_id (bitslot);
 223                 sscanf (prop->value().c_str(), "%" PRIu32, &bitslot);
 224                 _session.mark_insert_id (bitslot);
 225         }
 226
 227         return 0;
 228 }
 229
 230 ARDOUR::framecnt_t
 231 PortInsert::signal_latency() const
 232 {
 233         /* because we deliver and collect within the same cycle,
 234            all I/O is necessarily delayed by at least frames_per_cycle().
 235
 236            if the return port for insert has its own latency, we
 237            need to take that into account too.
 238         */
 239
 240         if (_measured_latency == 0) {
 241                 return _session.engine().frames_per_cycle() + _input->signal_latency();
 242         } else {
 243                 return _measured_latency;
 244         }
 245 }
 246
 247 /** Caller must hold process lock */
 248 bool
 249 PortInsert::configure_io (ChanCount in, ChanCount out)
 250 {
 251         assert (!AudioEngine::instance()->process_lock().trylock());
 252
 253         /* for an insert, processor input corresponds to IO output, and vice versa */
 254
 255         if (_input->ensure_io (in, false, this) != 0) {
 256                 return false;
 257         }
 258
 259         if (_output->ensure_io (out, false, this) != 0) {
 260                 return false;
 261         }
 262
 263         return Processor::configure_io (in, out);
 264 }
 265
 266 bool
 267 PortInsert::can_support_io_configuration (const ChanCount& in, ChanCount& out) const
 268 {
 269         out = in;
 270         return true;
 271 }
 272
 273 bool
 274 PortInsert::set_name (const std::string& name)
 275 {
 276         bool ret = Processor::set_name (name);
 277
 278         ret = (ret && _input->set_name (name) && _output->set_name (name));
 279
 280         return ret;
 281 }
 282
 283 void
 284 PortInsert::activate ()
 285 {
 286         IOProcessor::activate ();
 287
 288         _out->activate ();
 289 }
 290
 291 void
 292 PortInsert::deactivate ()
 293 {
 294         IOProcessor::deactivate ();
 295
 296         _out->deactivate ();
 297 }