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