non/Timeline/Engine/Disk_Stream.H

120 lines
3.7 KiB
C++

/*******************************************************************************/
/* Copyright (C) 2008 Jonathan Moore Liles */
/* */
/* 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; see the file COPYING. If not,write to the Free Software */
/* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
/*******************************************************************************/
#pragma once
#include <jack/ringbuffer.h>
#include <semaphore.h>
#include <errno.h>
#include <pthread.h>
#include <vector>
#include "types.h"
#include "util/Mutex.H"
class Track;
class Audio_Sequence;
class Disk_Stream : public Mutex
{
/* not permitted */
Disk_Stream ( const Disk_Stream &rhs );
Disk_Stream & operator = ( const Disk_Stream &rhs );
protected:
pthread_t _thread; /* io thread */
Track *_track; /* Track we belong to */
nframes_t _nframes; /* buffer size */
nframes_t _frame; /* location of disk read */
std::vector < jack_ringbuffer_t * >_rb; /* one ringbuffer for each channel */
sem_t _blocks; /* semaphore to wake the IO thread with */
int _total_blocks; /* total number of blocks that we can buffer */
int _disk_io_blocks; /* the number of blocks to read/write to/from disk at once */
nframes_t _frame_rate; /* used for buffer size calculations */
volatile nframes_t _pending_seek; /* absolute transport position to seek to */
volatile int _terminate;
volatile int _xruns;
int channels ( void ) const { return _rb.size(); }
Audio_Sequence * sequence ( void ) const;
Track * track ( void ) const;
static void *disk_thread ( void *arg );
void _resize_buffers ( nframes_t nframes, int channels );
protected:
void block_processed ( void ) { sem_post( &_blocks ); }
bool wait_for_block ( void )
{
while ( ! sem_wait( &_blocks ) && errno == EINTR );
if ( _terminate )
return false;
else
return true;
}
virtual void disk_thread ( void ) = 0;
void base_flush ( bool is_output );
virtual void flush ( void ) = 0;
public:
/* must be set before any Disk_Streams are created */
static float seconds_to_buffer;
static size_t disk_io_kbytes;
int xruns ( void ) { return _xruns; }
Disk_Stream ( Track *th, float frame_rate, nframes_t nframes, int channels );
virtual ~Disk_Stream ( );
void resize_buffers ( nframes_t nframes );
/* void seek ( nframes_t frame ); */
/* bool seek_pending ( void ); */
void run ( void );
void shutdown ( void );
virtual nframes_t process ( nframes_t nframes ) = 0;
int buffer_percent ( void );
};