150 lines
4.5 KiB
C
150 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 "Disk_Stream.H"
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#include "Track.H"
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#include "Audio_Sequence.H"
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#include "Port.H"
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#include "Engine.H" // for locking.
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#include "dsp.h"
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/**********/
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/* Engine */
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/**********/
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/* A Disk_Stream uses a separate I/O thread to stream a track's
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regions from disk into a ringbuffer to be processed by the RT
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thread (or vice-versa). The I/O thread syncronizes access with the
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user thread via the Timeline mutex. The size of the buffer (in
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seconds) must be set before any Disk_Stream objects are created;
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that is, at startup time. The default is 5 seconds, which may or
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may not be excessive depending on various external factors. */
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/* FIXME: handle termination of IO thread in destructor */
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/* FIXME: deal with (jack) buffer size changes */
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/* FIXME: needs error handling everywhere! */
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/* TODO: handle capture too. For this to work with some kind of
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* punch-in/out system, I believe we'll have to always keep at least
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* one buffer's worth of input. We would need this anyway in order to
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* pass input through to output (software monitoring). What about
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* looped recording? */
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/* TODO: latency compensation? Does this really apply to us? (we're
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* not hosting plugins here) */
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/* TODO: read/write data from/to disk in larger chunks to avoid
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* excessive seeking. 256k is supposedly the sweetspot. */
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float Disk_Stream::seconds_to_buffer = 5.0f;
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// size_t Disk_Stream::disk_block_frames = 2048;
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Disk_Stream::Disk_Stream ( Track *th, float frame_rate, nframes_t nframes, int channels ) : _th( th )
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{
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_frame = 0;
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_thread = 0;
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_terminate = false;
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_pending_seek = -1;
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printf( "nframes %lu\n", nframes );
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_total_blocks = frame_rate * seconds_to_buffer / nframes;
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_nframes = nframes;
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size_t bufsize = _total_blocks * nframes * sizeof( sample_t );
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for ( int i = channels; i--; )
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_rb.push_back( jack_ringbuffer_create( bufsize ) );
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sem_init( &_blocks, 0, _total_blocks );
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// run();
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}
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Disk_Stream::~Disk_Stream ( )
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{
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/* it isn't safe to do all this with the RT thread running */
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engine->lock();
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_th = NULL;
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sem_destroy( &_blocks );
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for ( int i = channels(); i--; )
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jack_ringbuffer_free( _rb[ i ] );
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engine->unlock();
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}
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/** stop the IO thread, block until it finishes. */
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void
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Disk_Stream::shutdown ( void )
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{
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_terminate = true;
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/* try to wake the thread so it'll see that it's time to die */
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block_processed();
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if ( _thread )
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pthread_join( _thread, NULL );
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_terminate = false;
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}
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Audio_Sequence *
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Disk_Stream::track ( void )
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{
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return (Audio_Sequence*)_th->track();
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}
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/** start Disk_Stream thread */
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void
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Disk_Stream::run ( void )
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{
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if ( pthread_create( &_thread, NULL, &Disk_Stream::disk_thread, this ) != 0 )
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/* error */;
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}
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/* to be called when the JACK buffer size changes. */
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void
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Disk_Stream::resize ( nframes_t nframes )
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{
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if ( nframes != _nframes )
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/* FIXME: to something here! */;
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}
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/* static wrapper */
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void *
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Disk_Stream::disk_thread ( void *arg )
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{
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((Disk_Stream*)arg)->disk_thread();
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return NULL;
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}
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int
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Disk_Stream::buffer_percent ( void )
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{
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int n;
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sem_getvalue( &_blocks, &n );
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return 100 - (n * 100 / _total_blocks);
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}
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