livetrax/libs/ardour/send.cc

/*
    Copyright (C) 2000 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 <algorithm>

#include <pbd/xml++.h>

#include <ardour/send.h>
#include <ardour/session.h>
#include <ardour/port.h>
#include <ardour/audio_port.h>
#include <ardour/buffer_set.h>
#include <ardour/meter.h>
#include <ardour/panner.h>
#include <ardour/io.h>

#include "i18n.h"

using namespace ARDOUR;
using namespace PBD;

Send::Send (Session& s, Placement p)
	: IOProcessor (s, string_compose (_("send %1"), (bitslot = s.next_send_id()) + 1), p)
{
	_metering = false;
	ProcessorCreated (this); /* EMIT SIGNAL */
}

Send::Send (Session& s, const XMLNode& node)
	: IOProcessor (s,  "send", PreFader)
{
	_metering = false;

	if (set_state (node)) {
		throw failed_constructor();
	}

	ProcessorCreated (this); /* EMIT SIGNAL */
}

Send::Send (const Send& other)
	: IOProcessor (other._session, string_compose (_("send %1"), (bitslot = other._session.next_send_id()) + 1), other.placement())
{
	_metering = false;

	expected_inputs.set (DataType::AUDIO, 0);

#ifdef THIS_NEEDS_FIXING_FOR_V3

	/* set up the same outputs, and connect them to the same places */

	_io->no_panner_reset = true;

	for (uint32_t i = 0; i < other.n_outputs (); ++i) {
		add_output_port ("", 0);
		Port* p = other.output (i);
		if (p) {
			/* this is what the other send's output is connected to */
			const char **connections = p->get_connections ();
			if (connections) {
				for (uint32_t c = 0; connections[c]; ++c) {
					connect_output (output (i), connections [c], 0);
				}
			}
		}
	}
	
	/* setup panner */

	_io->no_panner_reset = false;

	/* copy state */

	XMLNode& other_state (const_cast<Send*>(&other)->_panner->get_state());
	_panner->set_state (other_state);
	
	delete &other_state;
#endif

	ProcessorCreated (this); /* EMIT SIGNAL */
}

Send::~Send ()
{
	GoingAway ();
}

XMLNode&
Send::get_state(void)
{
	return state (true);
}

XMLNode&
Send::state(bool full)
{
	XMLNode& node = IOProcessor::state(full);
	char buf[32];
	node.add_property ("type", "send");
	snprintf (buf, sizeof (buf), "%" PRIu32, bitslot);
	node.add_property ("bitslot", buf);

	return node;
}

int
Send::set_state(const XMLNode& node)
{
	XMLNodeList nlist = node.children();
	XMLNodeIterator niter;
	const XMLProperty* prop;

	if ((prop = node.property ("bitslot")) == 0) {
		bitslot = _session.next_send_id();
	} else {
		sscanf (prop->value().c_str(), "%" PRIu32, &bitslot);
		_session.mark_send_id (bitslot);
	}

	const XMLNode* insert_node = &node;

	/* Send has regular IO automation (gain, pan) */

	for (niter = nlist.begin(); niter != nlist.end(); ++niter) {
		if ((*niter)->name() == "IOProcessor") {
			insert_node = *niter;
		} else if ((*niter)->name() == X_("Automation")) {
			// _io->set_automation_state (*(*niter), Evoral::Parameter(GainAutomation));
		}
	}
	
	IOProcessor::set_state (*insert_node);

	return 0;
}

void
Send::run_in_place (BufferSet& bufs, nframes_t start_frame, nframes_t end_frame, nframes_t nframes, nframes_t offset)
{
	if (active()) {

		// we have to copy the input, because IO::deliver_output may alter the buffers
		// in-place, which a send must never do.

		BufferSet& sendbufs = _session.get_mix_buffers(bufs.count());

		sendbufs.read_from(bufs, nframes);
		assert(sendbufs.count() == bufs.count());

		_io->deliver_output (sendbufs, start_frame, end_frame, nframes, offset);

		if (_metering) {
			if (_io->effective_gain() == 0) {
				_io->peak_meter().reset();
			} else {
				_io->peak_meter().run_in_place(_io->output_buffers(), start_frame, end_frame, nframes, offset);
			}
		}

	} else {
		_io->silence (nframes, offset);
		
		if (_metering) {
			_io->peak_meter().reset();
		}
	}
}

void
Send::set_metering (bool yn)
{
	_metering = yn;

	if (!_metering) {
		/* XXX possible thread hazard here */
		_io->peak_meter().reset();
	}
}

bool
Send::can_support_io_configuration (const ChanCount& in, ChanCount& out_is_ignored) const
{
	if (_io->input_maximum() == ChanCount::INFINITE && _io->output_maximum() == ChanCount::INFINITE) {

		/* not configured yet */

		return 1; /* we can support anything the first time we're asked */

	} else {

		/* the "input" config for a port insert corresponds to how
		   many output ports it will have.
		*/

		if (_io->output_maximum() == in) {
			return 1;
		} 
	}

	return -1;
}

bool
Send::configure_io (ChanCount in, ChanCount out)
{
	/* we're transparent no matter what.  fight the power. */

	if (out != in) {
		return false;
	}

	_io->set_output_maximum (in);
	_io->set_output_minimum (in);
	_io->set_input_maximum (ChanCount::ZERO);
	_io->set_input_minimum (ChanCount::ZERO);

	if (_io->ensure_io (ChanCount::ZERO, in, false, this) != 0) {
		return false;
	}

	Processor::configure_io(in, out);
	_io->reset_panner();

	return true;
}

ChanCount
Send::output_streams() const
{
	// this method reflects the idea that from the perspective of the Route's ProcessorList, 
	// a send is just a passthrough. that doesn't match what the Send actually does with its 
	// data, but since what it does is invisible to the Route, it appears to be a passthrough.
	
	return _configured_input;
}

ChanCount
Send::input_streams() const
{
	return _configured_input;
}


void
Send::expect_inputs (const ChanCount& expected)
{
	if (expected != expected_inputs) {
		expected_inputs = expected;
		_io->reset_panner ();
	}
}