170 lines
4.5 KiB
C
170 lines
4.5 KiB
C
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/*******************************************************************************/
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/* Copyright (C) 2008 Jonathan Moore Liles */
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/* */
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/* This program is free software; you can redistribute it and/or modify it */
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/* under the terms of the GNU General Public License as published by the */
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/* Free Software Foundation; either version 2 of the License, or (at your */
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/* option) any later version. */
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/* */
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/* This program is distributed in the hope that it will be useful, but WITHOUT */
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/* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or */
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/* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for */
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/* more details. */
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/* */
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/* You should have received a copy of the GNU General Public License along */
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/* with This program; see the file COPYING. 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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/* Wrapper for a JACK audio port */
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#include "Port.H"
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#include <string.h>
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#include "Engine.H"
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#include <stdio.h> // sprintf
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static const char *name_for_port ( Port::type_e dir, const char *base, int n, const char *type );
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int
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Port::max_name ( void )
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{
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return jack_port_name_size() - jack_client_name_size() - 6;
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}
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/* nframes is the number of frames to buffer */
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Port::Port ( jack_port_t *port )
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{
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_port = port;
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_name = jack_port_name( _port );
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}
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Port::Port ( const char *name, type_e dir )
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{
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activate( name, dir );
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}
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Port::Port ( type_e dir, const char *base, int n, const char *type )
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{
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const char *name = name_for_port( dir, base, n, type );
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activate( name, dir );
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}
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Port::~Port ( )
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{
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/* if ( _port ) */
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/* jack_port_unregister( engine->client(), _port ); */
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}
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static const char *
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name_for_port ( Port::type_e dir, const char *base, int n, const char *type )
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{
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static char pname[ 512 ];
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const char *dir_s = dir == Port::Output ? "out" : "in";
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strncpy( pname, base, Port::max_name() );
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pname[ Port::max_name() - 1 ] = '\0';
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int l = strlen( pname );
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if ( type )
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snprintf( pname + l, sizeof( pname ) - l, "/%s-%s-%d", type, dir_s, n + 1 );
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else
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snprintf( pname + l, sizeof( pname ) - l, "/%s-%d", dir_s, n + 1 );
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return pname;
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}
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void
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Port::activate ( const char *name, type_e dir )
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{
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_name = name;
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_port = jack_port_register( engine->client(), _name,
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JACK_DEFAULT_AUDIO_TYPE,
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dir == Output ? JackPortIsOutput : JackPortIsInput,
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0 );
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}
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/** returns the sum of latency of all ports between this one and a
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terminal port. */
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/* FIMXE: how does JACK know that input A of client Foo connects to
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output Z of the same client in order to draw the line through Z to a
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terminal port? And, if this determination cannot be made, what use is
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this function? */
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nframes_t
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Port::total_latency ( void ) const
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{
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return jack_port_get_total_latency( engine->client(), _port );
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}
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/** returns the number of frames of latency assigned to this port */
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nframes_t
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Port::latency ( void ) const
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{
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return jack_port_get_latency( _port );
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}
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/** inform JACK that port has /frames/ frames of latency */
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void
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Port::latency ( nframes_t frames )
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{
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jack_port_set_latency( _port, frames );
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}
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void
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Port::shutdown ( void )
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{
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if ( _port )
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jack_port_unregister( engine->client(), _port );
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}
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/** rename port */
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bool
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Port::name ( const char *name )
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{
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_name = name;
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return 0 == jack_port_set_name( _port, name );
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}
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bool
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Port::name ( const char *base, int n, const char *type )
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{
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return name( name_for_port( this->type(), base, n, type ) );
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}
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void
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Port::write ( sample_t *buf, nframes_t nframes )
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{
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memcpy( buffer( nframes ), buf, nframes * sizeof( sample_t ) );
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}
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void
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Port::read ( sample_t *buf, nframes_t nframes )
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{
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memcpy( buf, buffer( nframes ), nframes * sizeof( sample_t ) );
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}
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void *
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Port::buffer ( nframes_t nframes )
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{
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return jack_port_get_buffer( _port, nframes );
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}
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void
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Port::silence ( nframes_t nframes )
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{
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memset( buffer( nframes ), 0, nframes * sizeof( sample_t ) );
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}
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