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/*
* XMMS Crossfade Plugin
* Copyright (C) 2000-2001 Peter Eisenlohr <p.eisenlohr@gmx.net>
*
* based on the original OSS Output Plugin
* Copyright (C) 1998-2000 Peter Alm, Mikael Alm, Olle Hallnas, Thomas Nilsson and 4Front Technologies
*
* 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; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include "effect.h"
void
effect_init(effect_context_t *ec,
EffectPlugin *ep)
{
memset(ec, 0, sizeof(*ec));
effect_set_plugin(ec, ep);
}
void
effect_set_plugin(effect_context_t *ec,
EffectPlugin *ep)
{
ec->use_xmms_plugin = (ep == EFFECT_USE_XMMS_PLUGIN);
ec->ep = ec->use_xmms_plugin ? NULL : ep;
}
gint
effect_flow(effect_context_t *ec,
gpointer *buffer,
gint length,
format_t *format,
gboolean allow_format_change)
{
EffectPlugin *ep;
if(ec->use_xmms_plugin ? effects_enabled() : (ec->ep != NULL)) {
ep = ec->use_xmms_plugin ? get_current_effect_plugin() : ec->ep;
if(ep != ec->last_ep) {
DEBUG(("[crossfade] effect: plugin: \"%s\"%s\n",
ep ? (ep->description ? ep->description : "<unnamed>") : "<none>",
ec->use_xmms_plugin ? " (XMMS)" : ""));
ec->last_ep = ep;
}
if(ep == NULL) return length;
if(ep->query_format) {
AFormat fmt = format->fmt;
gint rate = format->rate;
gint nch = format->nch;
ep->query_format(&fmt, &rate, &nch);
if(!ec->is_active
|| (ec->fmt != fmt)
|| (ec->rate != rate)
|| (ec->nch != nch)) {
if(!allow_format_change && ((fmt != format->fmt) ||
(rate != format->rate) ||
(nch != format->nch))) {
DEBUG(("[crossfade] effect: format mismatch "
"(fmt=%d rate=%d nch=%d)!\n", fmt, rate, nch));
ec->is_valid = FALSE;
}
else {
if(setup_format(fmt, rate, nch, &ec->format) < 0) {
DEBUG(("[crossfade] effect: format not supported "
"(fmt=%d rate=%d nch=%d)!\n", fmt, rate, nch));
ec->is_valid = FALSE;
}
else {
DEBUG(("[crossfade] effect: plugin enabled "
"(fmt=%d rate=%d nch=%d)\n", fmt, rate, nch));
ec->is_valid = TRUE;
}
}
ec->is_active = TRUE;
ec->fmt = fmt;
ec->rate = rate;
ec->nch = nch;
}
if(ec->is_valid && ep->mod_samples) {
length = ep->mod_samples(buffer, length, format->fmt, format->rate, format->nch);
if(allow_format_change) format_copy(format, &ec->format);
}
}
else {
if(!ec->is_active) {
DEBUG(("[crossfade] effect: plugin enabled (default format)\n"));
ec->is_active = TRUE;
}
if(ep->mod_samples)
length = ep->mod_samples(buffer, length, format->fmt, format->rate, format->nch);
}
}
else if(ec->is_active) {
DEBUG(("[crossfade] effect: plugin disabled\n"));
ec->is_active = FALSE;
}
return length;
}
void
effect_free(effect_context_t *ec)
{
/* nothing to do */
}
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