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non/Timeline/Peaks.C

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/*******************************************************************************/
/* 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. */
/*******************************************************************************/
#include "Peaks.H"
// #include "Timeline.H"
#include <sys/mman.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <unistd.h>
#include <fcntl.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <sndfile.h>
#include "Audio_File.H"
#include "assert.h"
#include <math.h>
#include <FL/Fl.H> // for Fl::check();
Peaks::peakbuffer Peaks::_peakbuf;
static
const char *
peakname ( const char *filename, int chunksize )
{
static char file[512];
snprintf( file, 512, "%s-[%d].peak", filename, chunksize );
return (const char*)&file;
}
/** Prepare a buffer of peaks from /s/ to /e/ for reading. Must be
* called before any calls to operator[] */
int
Peaks::fill_buffer ( float fpp, nframes_t s, nframes_t e ) const
{
_fpp = fpp;
return read_peaks( s, e, (e - s) / fpp, fpp );
}
static int
nearest_power_of_two ( int v )
{
int p = 1;
while ( 1 << p < v )
++p;
return 1 << p;
}
const int MAX_CHUNKSIZE = 4096;
const int MIN_CHUNKSIZE = 256;
int
Peaks::read_peakfile_peaks ( Peak *peaks, nframes_t s, int npeaks, int chunksize ) const
{
FILE *fp;
int best_fit = nearest_power_of_two( chunksize );
int pfchunksize;
// for ( pfchunksize = best_fit; pfchunksize < MAX_CHUNKSIZE; pfchunksize <<= 1 )
for ( pfchunksize = best_fit; pfchunksize >= MIN_CHUNKSIZE; pfchunksize >>= 1 )
if ( ( fp = fopen( peakname( _clip->name(), pfchunksize ), "r" ) ) )
break;
if ( ! fp )
{
printf( "failed to open peak file!\n" );
return 0;
}
int channels = _clip->channels();
const int ratio = chunksize / pfchunksize;
/* locate to start position */
if ( fseek( fp, (s * channels / pfchunksize) * sizeof( Peak ), SEEK_CUR ) )
/* failed to seek... peaks not ready? */
return 0;
if ( ratio == 1 )
{
int len = fread( peaks, sizeof( Peak ) * channels, npeaks, fp );
fclose( fp );
return len;
}
Peak *pbuf = new Peak[ ratio * channels ];
size_t len = 0;
int i;
for ( i = 0; i < npeaks; ++i )
{
/* read in a buffer */
len = fread( pbuf, sizeof( Peak ) * channels, ratio, fp );
Peak *pk = peaks + (i * channels);
/* get the peak for each channel */
for ( int j = 0; j < channels; ++j )
{
Peak *p = &pk[ j ];
p->min = 0;
p->max = 0;
const Peak *pb = pbuf + j;
for ( int k = len; k--; pb += channels )
{
if ( pb->max > p->max )
p->max = pb->max;
if ( pb->min < p->min )
p->min = pb->min;
}
}
if ( len < ratio )
break;
}
delete[] pbuf;
fclose( fp );
return i;
}
int
Peaks::read_source_peaks ( Peak *peaks, int npeaks, int chunksize ) const
{
int channels = _clip->channels();
sample_t *fbuf = new sample_t[ chunksize * channels ];
size_t len;
int i;
for ( i = 0; i < npeaks; ++i )
{
/* read in a buffer */
len = _clip->read( fbuf, -1, chunksize );
Peak *pk = peaks + (i * channels);
/* get the peak for each channel */
for ( int j = 0; j < channels; ++j )
{
Peak &p = pk[ j ];
p.min = 0;
p.max = 0;
for ( int k = j; k < len * channels; k += channels )
{
if ( fbuf[ k ] > p.max )
p.max = fbuf[ k ];
if ( fbuf[ k ] < p.min )
p.min = fbuf[ k ];
}
}
if ( len < chunksize )
break;
}
delete[] fbuf;
return i;
}
int
Peaks::read_source_peaks ( Peak *peaks, nframes_t s, int npeaks, int chunksize ) const
{
// _clip->open();
_clip->seek( s );
int i = read_source_peaks( peaks, npeaks, chunksize );
// _clip->close();
return i;
}
int
Peaks::read_peaks ( nframes_t s, nframes_t e, int npeaks, int chunksize ) const
{
printf( "reading peaks %d @ %d\n", npeaks, chunksize );
if ( _peakbuf.size < npeaks * _clip->channels() )
{
_peakbuf.size = npeaks * _clip->channels();
// printf( "reallocating peak buffer %li\n", _peakbuf.size );
_peakbuf.buf = (peakdata*)realloc( _peakbuf.buf, sizeof( peakdata ) + (_peakbuf.size * sizeof( Peak )) );
}
assert( s >= 0 );
_peakbuf.offset = s;
_peakbuf.buf->chunksize = chunksize;
/* FIXME: compart to (minimum) peakfile chunk size */
if ( chunksize < 256 )
_peakbuf.len = read_source_peaks( _peakbuf.buf->data, s, npeaks, chunksize );
else
_peakbuf.len = read_peakfile_peaks( _peakbuf.buf->data, s, npeaks, chunksize );
return _peakbuf.len;
}
bool
Peaks::open ( void )
{
const char *filename = _clip->name();
int fd;
if ( ! current() )
/* Build peaks asyncronously */
if ( ! fork() )
exit( make_peaks( 256 ) );
/* FIXME: 256 == bogus */
if ( ( fd = ::open( peakname( filename, 256 ), O_RDONLY ) ) < 0 )
return false;
{
struct stat st;
fstat( fd, &st );
_len = st.st_size;
}
::close( fd );
_len = (_len - sizeof( int )) / sizeof( Peak );
return true;
}
/** returns false if peak file for /filename/ is out of date */
bool
Peaks::current ( void ) const
{
int sfd, pfd;
if ( ( sfd = ::open( _clip->name(), O_RDONLY ) ) < 0 )
return true;
/* FIXME: 256 == bogus */
if ( ( pfd = ::open( peakname( _clip->name(), 256 ), O_RDONLY ) ) < 0 )
return false;
struct stat sst, pst;
fstat( sfd, &sst );
fstat( pfd, &pst );
close( sfd );
close( pfd );
return sst.st_mtime <= pst.st_mtime;
}
/* FIXME: we need to work out a way to run this in another thread and
possibly stream back the data to the GUI */
/** build peaks file for /filename/ if necessary */
bool
Peaks::make_peaks ( int chunksize )
{
const char *filename = _clip->name();
if ( current() )
return true;
_clip->seek( 0 );
FILE *fp = fopen( peakname( filename, chunksize ), "w" );
if ( ! fp )
return false;
Peak peaks[ _clip->channels() ];
size_t len;
do {
len = read_source_peaks( peaks, 1, chunksize );
fwrite( peaks, sizeof( peaks ), 1, fp );
}
while ( len );
fclose( fp );
return true;
}
/** return normalization factor for range of samples from /start/ to
/end/ (uses known peak data if possible */
float
//Peaks::normalization_factor( float fpp, nframes_t start, nframes_t end ) const
Peak::normalization_factor( void ) const
{
float s;
s = 1.0f / fabs( this->max );
if ( s * this->min < -1.0 )
s = 1.0f / fabs( this->min );
return s;
}
Peak_Writer::Peak_Writer ( const char *filename, int chunksize, int channels )
{
_channels = channels;
_chunksize = chunksize;
_index = 0;
_peak = new Peak[ channels ];
memset( _peak, 0, sizeof( Peak ) * channels );
if ( ! ( _fp = fopen( peakname( filename, chunksize ), "w" ) ) )
/* error! */;
}
Peak_Writer::~Peak_Writer ( )
{
fclose( _fp );
delete _peak;
}
/** append peaks for samples in /buf/ to peakfile */
void
Peak_Writer::write ( sample_t *buf, nframes_t nframes )
{
for ( ; nframes--; ++_index, buf += _channels )
{
for ( int j = 0; j < _channels; ++j )
{
Peak *p = _peak + j;
if ( *buf > p->max )
p->max = *buf;
if ( *buf < p->min )
p->min = *buf;
}
if ( _index == _chunksize - 1 )
{
fwrite( _peak, sizeof( Peak ), _channels, _fp );
memset( _peak, 0, sizeof( Peak ) * _channels );
_index = 0;
}
}
}
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