non/Timeline/Playback_DS.C

228 lines
6.9 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. */
/*******************************************************************************/
/* Handles streaming regions from disk to track outputs. */
/* FIXME: we shouldn't depend on these */
#include "Timeline.H"
#include "Engine.H"
#include "Audio_Track.H"
#include "Track_Header.H"
#include "Port.H"
#include "Playback_DS.H"
#include "dsp.h"
bool
Playback_DS::seek_pending ( void )
{
return _pending_seek != (nframes_t)-1;
}
/* THREAD: RT */
/** request that the IO thread perform a seek and rebuffer. This is
called for each Disk_Stream whenever the RT thread determines that
the transport has jumped to a new position. This is called *before*
process. */
void
Playback_DS::seek ( nframes_t frame )
{
printf( "requesting seek\n" );
if ( seek_pending() )
printf( "seek error, attempt to seek while seek is pending\n" );
_pending_seek = frame;
/* flush buffers */
for ( int i = channels(); i--; )
jack_ringbuffer_read_advance( _rb[ i ], jack_ringbuffer_read_space( _rb[ i ] ) );
/* dirty hack... reset the semaphore. Should we just call sem_init
* again instead? */
/* sem_init( &_blocks, 0, _total_blocks ); */
int n;
sem_getvalue( &_blocks, &n );
n = _total_blocks - n;
while ( n-- )
sem_post( &_blocks );
}
/* THREAD: IO */
/** read /nframes/ from the attached track into /buf/ */
void
Playback_DS::read_block ( sample_t *buf, nframes_t nframes )
{
memset( buf, 0, nframes * sizeof( sample_t ) * channels() );
/* stupid chicken/egg */
if ( ! timeline )
return;
// printf( "IO: attempting to read block @ %lu\n", _frame );
if ( ! track() )
{
// _frame += _nframes;
return;
}
timeline->rdlock();
if ( track()->play( buf, _frame, nframes, channels() ) )
_frame += nframes;
else
/* error */;
timeline->unlock();
}
/* THREAD: IO */
void
Playback_DS::disk_thread ( void )
{
printf( "IO thread running...\n" );
/* buffer to hold the interleaved data returned by the track reader */
sample_t *buf = new sample_t[ _nframes * channels() ];
const size_t block_size = _nframes * sizeof( sample_t );
while ( wait_for_block() )
{
// printf( "IO: RT thread is ready for more data...\n" );
// printf( "IO: disk buffer is %3d%% full\r", output_buffer_percent() );
// lock(); // for seeking
if ( seek_pending() )
{
printf( "performing seek\n" );
_frame = _pending_seek;
_pending_seek = -1;
/* finish flushing the buffer */
/* for ( int i = channels(); i-- ) */
/* jack_ringbuffer_write_advance( _rb[ i ], jack_ringbuffer_write_space( _rb[ i ] ) ); */
}
/* FIXME: should we not read from disk in larger-than-JACK-buffer blocks? */
read_block( buf, _nframes );
// unlock(); // for seeking
/* deinterleave the buffer and stuff it into the per-channel ringbuffers */
for ( int i = channels(); i--; )
{
while ( jack_ringbuffer_write_space( _rb[ i ] ) < block_size )
{
printf( "IO: disk buffer overrun!\n" );
/* FIXME: is this *really* the right thing to do? */
usleep( 2000 );
}
/* deinterleave direcectly into the ringbuffer to avoid
* unnecessary copying */
jack_ringbuffer_data_t rbd[2];
jack_ringbuffer_get_write_vector( _rb[ i ], rbd );
if ( rbd[ 0 ].len >= _nframes )
/* it'll all fit in one go */
buffer_deinterleave_one_channel( (sample_t*)rbd[ 0 ].buf, buf, i, channels(), _nframes );
else if ( rbd[ 1 ].len )
{
/* there's enough space in the ringbuffer, but it's not contiguous */
/* do the first half */
const nframes_t f = rbd[ 1 ].len / sizeof( sample_t );
buffer_deinterleave_one_channel( (sample_t*)rbd[ 0 ].buf, buf, i, channels(), f );
assert( rbd[ 1 ].len >= (_nframes - f) * sizeof( sample_t ) );
/* do the second half */
buffer_deinterleave_one_channel( (sample_t*)rbd[ 1 ].buf, buf + f, i, channels(), _nframes - f );
}
else
printf( "programming error: expected more space in ringbuffer\n" );
/* buffer_deinterleave_one_channel( (sample_t*)rbd.buf, buf, i, channels(), _nframes ); */
/* jack_ringbuffer_write( _rb[ i ], (char*)cbuf, block_size ); */
jack_ringbuffer_write_advance( _rb[ i ], _nframes * sizeof( sample_t ) );
}
}
printf( "IO thread terminating.\n" );
delete[] buf;
}
/* THREAD: RT */
/** take a single block from the ringbuffers and send it out the
* attached track's ports */
nframes_t
Playback_DS::process ( nframes_t nframes )
{
const size_t block_size = nframes * sizeof( sample_t );
// printf( "process: %lu %lu %lu\n", _frame, _frame + nframes, nframes );
for ( int i = channels(); i--; )
{
void *buf = _th->output[ i ].buffer( nframes );
if ( jack_ringbuffer_read( _rb[ i ], (char*)buf, block_size ) < block_size )
{
printf( "RT: buffer underrun (disk can't keep up).\n" );
memset( buf, 0, block_size );
/* FIXME: we need to resync somehow */
}
/* /\* testing. *\/ */
/* FILE *fp = fopen( "testing.au", "a" ); */
/* fwrite( buf, block_size, 1, fp ); */
/* fclose( fp ); */
}
block_processed();
/* FIXME: bogus */
return nframes;
}