152 lines
4.5 KiB
C
152 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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#include "Engine.H"
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#include "Timeline.H" // for process()
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#define APP_NAME "Non-DAW" // FIXME: wrong place for this!
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/* This is the home of the JACK process callback (does this *really*
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need to be a class?) */
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Engine::Engine ( )
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{
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_client = NULL;
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_buffers_dropped = 0;
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}
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/* static wrapper */
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int
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Engine::process ( nframes_t nframes, void *arg )
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{
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return ((Engine*)arg)->process( nframes );
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}
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/* static wrapper */
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int
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Engine::sync ( jack_transport_state_t state, jack_position_t *pos, void *arg )
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{
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return ((Engine*)arg)->sync( state, pos );
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}
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void
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Engine::request_locate ( nframes_t frame )
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{
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if ( timeline )
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timeline->seek( frame );
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}
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/* THREAD: RT */
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/** This is the jack slow-sync callback. */
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int
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Engine::sync ( jack_transport_state_t state, jack_position_t *pos )
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{
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static bool seeking = false;
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switch ( state )
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{
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case JackTransportStopped: /* new position requested */
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/* JACK docs lie. This is only called when the transport
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is *really* stopped, not when starting a slow-sync
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cycle */
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request_locate( pos->frame );
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return 1;
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case JackTransportStarting: /* this means JACK is polling slow-sync clients */
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{
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if ( ! seeking )
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{
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request_locate( pos->frame );
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seeking = true;
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}
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int r = timeline->seek_pending();
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if ( ! r )
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seeking = false;
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return ! seeking;
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}
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case JackTransportRolling: /* JACK's timeout has expired */
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/* FIXME: what's the right thing to do here? */
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// request_locate( pos->frame );
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return 1;
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// return transport.frame == pos->frame;
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break;
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default:
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printf( "unknown transport state.\n" );
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}
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return 0;
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}
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/* THREAD: RT */
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int
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Engine::process ( nframes_t nframes )
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{
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jack_position_t pos;
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jack_transport_state_t ts;
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ts = jack_transport_query( _client, &pos );
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if ( ts != JackTransportRolling )
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return 0;
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if ( ! trylock() )
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{
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/* the data structures we need to access here (tracks and
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* their ports, but not track contents) may be in an
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* inconsistent state at the moment. Just punt and drop this
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* buffer. */
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++_buffers_dropped;
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return 0;
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}
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/* handle chicken/egg problem */
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if ( timeline )
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/* this will initiate the process() call graph for the various
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* number and types of tracks, which will in turn send data out
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* the appropriate ports. */
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timeline->process( nframes );
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unlock();
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return 0;
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}
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int
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Engine::init ( void )
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{
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if (( _client = jack_client_open ( APP_NAME, (jack_options_t)0, NULL )) == 0 )
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return 0;
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jack_set_process_callback( _client, &Engine::process, this );
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/* FIXME: should we wait to register this until after the session
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has been loaded (and we have disk threads running)? */
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jack_set_sync_callback( _client, &Engine::sync, this );
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jack_activate( _client );
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/* we don't need to create any ports until tracks are created */
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return 1;
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}
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