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Get rid of cumulative error in Peaks::Streamer

This commit is contained in:
Jonathan Moore Liles 2008-05-11 21:01:51 -05:00
parent 354b3a9fc3
commit 4cb8fbd22d
2 changed files with 28 additions and 17 deletions
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43
Timeline/Peaks.C
View File

@ -625,9 +625,7 @@ Peaks::Streamer::Streamer ( const char *filename, int channels, nframes_t chunks
Peaks::Streamer::~Streamer ( )
{
fwrite( _peak, sizeof( Peak ) * _channels, 1, _fp );
fflush( _fp );
/* fwrite( _peak, sizeof( Peak ) * _channels, 1, _fp ); */
touch( fileno( _fp ) );
@ -638,30 +636,43 @@ Peaks::Streamer::~Streamer ( )
/** append peaks for samples in /buf/ to peakfile */
void
Peaks::Streamer::write ( sample_t *buf, nframes_t nframes )
Peaks::Streamer::write ( const sample_t *buf, nframes_t nframes )
{
for ( ; nframes--; ++_index, buf += _channels )
while ( nframes )
{
for ( int j = 0; j < _channels; ++j )
{
Peak *p = _peak + j;
const nframes_t remaining = _chunksize - _index;
if ( *buf > p->max )
p->max = *buf;
if ( *buf < p->min )
p->min = *buf;
}
if ( _index == _chunksize - 1 )
if ( ! remaining )
{
fwrite( _peak, sizeof( Peak ) * _channels, 1, _fp );
/* FIXME: why the hell is this necessary? */
/* FIXME: shouldn't we just use write() instead? */
fflush( _fp );
memset( _peak, 0, sizeof( Peak ) * _channels );
_index = 0;
}
int processed = min( nframes, remaining );
for ( int i = _channels; i--; )
{
Peak *p = _peak + i;
const sample_t *f = buf + i;
for ( int j = processed; j--; f += _channels )
{
if ( *f > p->max )
p->max = *f;
if ( *f < p->min )
p->min = *f;
}
}
_index += processed;
nframes -= processed;
}
}

2
Timeline/Peaks.H
View File

@ -75,7 +75,7 @@ class Peaks
Streamer ( const char *filename, int channels, nframes_t chunksize );
~Streamer ( );
void write ( sample_t *buf, nframes_t nframes );
void write ( const sample_t *buf, nframes_t nframes );
};