/*
* Processed signed long samples from ibuf to obuf.
* Return number of samples processed.
*/
int st_fade_flow(eff_t effp, st_sample_t *ibuf, st_sample_t *obuf,
st_size_t *isamp, st_size_t *osamp)
{
fade_t fade = (fade_t) effp->priv;
/* len is total samples, chcnt counts channels */
int len = 0, chcnt = 0, t_output = 1, more_output = 1;
st_sample_t t_ibuf;
len = ((*isamp > *osamp) ? *osamp : *isamp);
*osamp = 0;
*isamp = 0;
for(; len && more_output; len--)
{
t_ibuf = (fade->samplesdone < 0 ? 0 : *ibuf);
if ((fade->samplesdone >= fade->in_start) &&
(!fade->do_out || fade->samplesdone < fade->out_stop))
{ /* something to generate output */
if (fade->samplesdone < fade->in_stop)
{ /* fade-in phase, increase gain */
*obuf = t_ibuf *
fade_gain(fade->samplesdone - fade->in_start,
fade->in_stop - fade->in_start,
fade->in_fadetype);
} /* endif fade-in */
else if (!fade->do_out || fade->samplesdone < fade->out_start)
{ /* steady gain phase */
*obuf = t_ibuf;
} /* endif steady phase */
else
{ /* fade-out phase, decrease gain */
*obuf = t_ibuf *
fade_gain(fade->out_stop - fade->samplesdone,
fade->out_stop - fade->out_start,
fade->out_fadetype);
} /* endif fade-out */
if (!(!fade->do_out || fade->samplesdone < fade->out_stop))
more_output = 0;
t_output = 1;
}
else
{ /* No output generated */
t_output = 0;
} /* endif something to output */
/* samplesdone < 0 means we are inventing samples right now
* and so not consuming (happens when in_start < 0).
*/
if (fade->samplesdone >= 0 )
{ /* Something to input */
*isamp += 1;
ibuf++;
} /* endif something accepted as input */
if (t_output)
{ /* Output generated, update pointers and counters */
obuf++;
*osamp += 1;
} /* endif t_output */
/* Process next channel */
chcnt++;
if (chcnt >= effp->ininfo.channels)
{ /* all channels of this sample processed */
chcnt = 0;
fade->samplesdone += 1;
} /* endif all channels */
} /* endfor */
/* If not more samples will be returned, let application know
* this.
*/
if (fade->do_out && fade->samplesdone >= fade->out_stop)
return ST_EOF;
else
return ST_SUCCESS;
}
/*
* Processed signed long samples from ibuf to obuf.
* Return number of samples processed.
*/
static int sox_fade_flow(sox_effect_t * effp, const sox_sample_t *ibuf, sox_sample_t *obuf,
size_t *isamp, size_t *osamp)
{
priv_t * fade = (priv_t *) effp->priv;
/* len is total samples, chcnt counts channels */
int len = 0, t_output = 1, more_output = 1;
sox_sample_t t_ibuf;
size_t chcnt = 0;
len = ((*isamp > *osamp) ? *osamp : *isamp);
*osamp = 0;
*isamp = 0;
for(; len && more_output; len--)
{
t_ibuf = *ibuf;
if ((fade->samplesdone >= fade->in_start) &&
(!fade->do_out || fade->samplesdone < fade->out_stop))
{ /* something to generate output */
if (fade->samplesdone < fade->in_stop)
{ /* fade-in phase, increase gain */
*obuf = t_ibuf *
fade_gain(fade->samplesdone - fade->in_start,
fade->in_stop - fade->in_start,
fade->in_fadetype);
} /* endif fade-in */
else if (!fade->do_out || fade->samplesdone < fade->out_start)
{ /* steady gain phase */
*obuf = t_ibuf;
} /* endif steady phase */
else
{ /* fade-out phase, decrease gain */
*obuf = t_ibuf *
fade_gain(fade->out_stop - fade->samplesdone,
fade->out_stop - fade->out_start,
fade->out_fadetype);
} /* endif fade-out */
if (!(!fade->do_out || fade->samplesdone < fade->out_stop))
more_output = 0;
t_output = 1;
}
else
{ /* No output generated */
t_output = 0;
} /* endif something to output */
*isamp += 1;
ibuf++;
if (t_output)
{ /* Output generated, update pointers and counters */
obuf++;
*osamp += 1;
} /* endif t_output */
/* Process next channel */
chcnt++;
if (chcnt >= effp->in_signal.channels)
{ /* all channels of this sample processed */
chcnt = 0;
fade->samplesdone += 1;
} /* endif all channels */
} /* endfor */
/* If not more samples will be returned, let application know
* this.
*/
if (fade->do_out && fade->samplesdone >= fade->out_stop)
return SOX_EOF;
else
return SOX_SUCCESS;
}
