non/Timeline/Audio_File_SF.C

149 lines
3.8 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. */
/*******************************************************************************/
#include "Audio_File_SF.H"
// #include "Timeline.H"
#include <sndfile.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
Audio_File_SF *
Audio_File_SF::from_file ( const char *filename )
{
SNDFILE *in;
SF_INFO si;
Audio_File_SF *c = NULL;
memset( &si, 0, sizeof( si ) );
if ( ! ( in = sf_open( filename, SFM_READ, &si ) ) )
{
printf( "couldn't open file\n" );
return NULL;
}
/* if ( si.samplerate != timeline->sample_rate() ) */
/* { */
/* printf( "error: samplerate mismatch!\n" ); */
/* goto invalid; */
/* } */
c = new Audio_File_SF;
c->_current_read = 0;
c->_filename = strdup( filename );
c->_length = si.frames;
c->_channels = si.channels;
c->_in = in;
// sf_close( in );
return c;
invalid:
sf_close( in );
return NULL;
}
bool
Audio_File_SF::open ( void )
{
/* SF_INFO si; */
/* memset( &si, 0, sizeof( si ) ); */
/* if ( ! ( _in = sf_open( _filename, SFM_READ, &si ) ) ) */
/* return false; */
seek( 0 );
return true;
}
void
Audio_File_SF::close ( void )
{
// sf_close( _in );
}
void
Audio_File_SF::seek ( nframes_t offset )
{
if ( offset != _current_read )
{
sf_seek( _in, _current_read = offset, SEEK_SET );
}
}
/* if channels is -1, then all channels are read into buffer
(interleaved). buf should be big enough to hold them all */
nframes_t
Audio_File_SF::read ( sample_t *buf, int channel, nframes_t len )
{
if ( len > 256 * 100 )
printf( "warning: attempt to read an insane number of frames (%lu) from soundfile\n", len );
// printf( "len = %lu, channels = %d\n", len, _channels );
nframes_t rlen;
if ( _channels == 1 || channel == -1 )
rlen = sf_readf_float( _in, buf, len );
else
{
sample_t *tmp = new sample_t[ len * _channels ];
rlen = sf_readf_float( _in, tmp, len );
/* extract the requested channel */
for ( int i = channel; i < rlen * _channels; i += _channels )
*(buf++) = tmp[ i ];
delete tmp;
}
_current_read += rlen;
return rlen;
}
/** read samples from /start/ to /end/ into /buf/ */
nframes_t
Audio_File_SF::read ( sample_t *buf, int channel, nframes_t start, nframes_t end )
{
assert( end > start );
open();
seek( start );
nframes_t len = read( buf, channel, end - start );
close();
return len;
}