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