ref: 38caa497d80367ca1c34062d69211d22bbb551dd
dir: /src/ladspa.c/
/* LADSPA effect support for sox
* (c) Reuben Thomas <rrt@sc3d.org> 2007
*
* This library is free software; you can redistribute it and/or modify it
* under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or (at
* your option) any later version.
*
* This library 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 Lesser
* General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this library; if not, write to the Free Software Foundation,
* Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "sox_i.h"
#ifdef HAVE_LADSPA_H
#include <assert.h>
#include <limits.h>
#include <string.h>
#include <ltdl.h>
#include <ladspa.h>
static sox_effect_handler_t sox_ladspa_effect;
/* Private data for resampling */
typedef struct {
char *name; /* plugin name */
lt_dlhandle lth; /* dynamic object handle */
const LADSPA_Descriptor *desc; /* plugin descriptor */
LADSPA_Handle handle; /* instantiated plugin handle */
LADSPA_Data *control; /* control ports */
unsigned long input_port, output_port;
} priv_t;
static LADSPA_Data ladspa_default(const LADSPA_PortRangeHint *p)
{
LADSPA_Data d;
if (LADSPA_IS_HINT_DEFAULT_0(p->HintDescriptor))
d = 0.0;
else if (LADSPA_IS_HINT_DEFAULT_1(p->HintDescriptor))
d = 1.0;
else if (LADSPA_IS_HINT_DEFAULT_100(p->HintDescriptor))
d = 100.0;
else if (LADSPA_IS_HINT_DEFAULT_440(p->HintDescriptor))
d = 440.0;
else if (LADSPA_IS_HINT_DEFAULT_MINIMUM(p->HintDescriptor))
d = p->LowerBound;
else if (LADSPA_IS_HINT_DEFAULT_MAXIMUM(p->HintDescriptor))
d = p->UpperBound;
else if (LADSPA_IS_HINT_DEFAULT_LOW(p->HintDescriptor)) {
if (LADSPA_IS_HINT_LOGARITHMIC(p->HintDescriptor))
d = exp(log(p->LowerBound) * 0.75 + log(p->UpperBound) * 0.25);
else
d = p->LowerBound * 0.75 + p->UpperBound * 0.25;
} else if (LADSPA_IS_HINT_DEFAULT_MIDDLE(p->HintDescriptor)) {
if (LADSPA_IS_HINT_LOGARITHMIC(p->HintDescriptor))
d = exp(log(p->LowerBound) * 0.5 + log(p->UpperBound) * 0.5);
else
d = p->LowerBound * 0.5 + p->UpperBound * 0.5;
} else if (LADSPA_IS_HINT_DEFAULT_HIGH(p->HintDescriptor)) {
if (LADSPA_IS_HINT_LOGARITHMIC(p->HintDescriptor))
d = exp(log(p->LowerBound) * 0.25 + log(p->UpperBound) * 0.75);
else
d = p->LowerBound * 0.25 + p->UpperBound * 0.75;
} else { /* shouldn't happen */
/* FIXME: Deal with this at a higher level */
lsx_fail("non-existent default value; using 0.1");
d = 0.1; /* Should at least avoid divide by 0 */
}
return d;
}
/*
* Process options
*/
static int sox_ladspa_getopts(sox_effect_t *effp, int n, char **argv)
{
priv_t * l_st = (priv_t *)effp->priv;
char *path;
union {LADSPA_Descriptor_Function fn; lt_ptr ptr;} ltptr;
unsigned long index = 0, i;
double arg;
l_st->input_port = ULONG_MAX;
l_st->output_port = ULONG_MAX;
/* Get module name */
if (n >= 1) {
l_st->name = argv[0];
n--; argv++;
}
/* Load module */
path = getenv("LADSPA_PATH");
if (path == NULL)
path = LADSPA_PATH;
lt_dlsetsearchpath(path);
if ((l_st->lth = lt_dlopenext(l_st->name)) == NULL) {
lsx_fail("could not open LADSPA plugin %s", l_st->name);
return SOX_EOF;
}
/* Get descriptor function */
if ((ltptr.ptr = lt_dlsym(l_st->lth, "ladspa_descriptor")) == NULL) {
lsx_fail("could not find ladspa_descriptor");
return SOX_EOF;
}
/* If no plugins in this module, complain */
if (ltptr.fn(0UL) == NULL) {
lsx_fail("no plugins found");
return SOX_EOF;
}
/* Get first plugin descriptor */
l_st->desc = ltptr.fn(0UL);
assert(l_st->desc); /* We already know this will work */
/* If more than one plugin, or first argument is not a number, try
to use first argument as plugin label. */
if (n > 0 && (ltptr.fn(1UL) != NULL || !sscanf(argv[0], "%lf", &arg))) {
while (l_st->desc && strcmp(l_st->desc->Label, argv[0]) != 0)
l_st->desc = ltptr.fn(++index);
if (l_st->desc == NULL) {
lsx_fail("no plugin called `%s' found", argv[0]);
return SOX_EOF;
} else
n--; argv++;
}
/* Scan the ports to check there's one input and one output */
l_st->control = lsx_calloc(l_st->desc->PortCount, sizeof(LADSPA_Data));
for (i = 0; i < l_st->desc->PortCount; i++) {
const LADSPA_PortDescriptor port = l_st->desc->PortDescriptors[i];
/* Check port is well specified. All control ports should be
inputs, but don't bother checking, as we never rely on this. */
if (LADSPA_IS_PORT_INPUT(port) && LADSPA_IS_PORT_OUTPUT(port)) {
lsx_fail("port %lu is both input and output", i);
return SOX_EOF;
} else if (LADSPA_IS_PORT_CONTROL(port) && LADSPA_IS_PORT_AUDIO(port)) {
lsx_fail("port %lu is both audio and control", i);
return SOX_EOF;
}
if (LADSPA_IS_PORT_AUDIO(port)) {
if (LADSPA_IS_PORT_INPUT(port)) {
if (l_st->input_port != ULONG_MAX) {
lsx_fail("can't use a plugin with more than one audio input port");
return SOX_EOF;
}
l_st->input_port = i;
} else if (LADSPA_IS_PORT_OUTPUT(port)) {
if (l_st->output_port != ULONG_MAX) {
lsx_fail("can't use a plugin with more than one audio output port");
return SOX_EOF;
}
l_st->output_port = i;
}
} else { /* Control port */
if (n == 0) {
if (!LADSPA_IS_HINT_HAS_DEFAULT(l_st->desc->PortRangeHints[i].HintDescriptor)) {
lsx_fail("not enough arguments for control ports");
return SOX_EOF;
}
l_st->control[i] = ladspa_default(&(l_st->desc->PortRangeHints[i]));
lsx_debug("default argument for port %lu is %f", i, l_st->control[i]);
} else {
if (!sscanf(argv[0], "%lf", &arg))
return lsx_usage(effp);
l_st->control[i] = (LADSPA_Data)arg;
lsx_debug("argument for port %lu is %f", i, l_st->control[i]);
n--; argv++;
}
}
}
/* Stop if we have any unused arguments */
return n? lsx_usage(effp) : SOX_SUCCESS;
}
/*
* Prepare processing.
*/
static int sox_ladspa_start(sox_effect_t * effp)
{
priv_t * l_st = (priv_t *)effp->priv;
unsigned long i;
/* Instantiate the plugin */
lsx_debug("rate for plugin is %g", effp->in_signal.rate);
l_st->handle = l_st->desc->instantiate(l_st->desc, (unsigned long)effp->in_signal.rate);
if (l_st->handle == NULL) {
lsx_fail("could not instantiate plugin");
return SOX_EOF;
}
for (i = 0; i < l_st->desc->PortCount; i++) {
const LADSPA_PortDescriptor port = l_st->desc->PortDescriptors[i];
if (LADSPA_IS_PORT_CONTROL(port))
l_st->desc->connect_port(l_st->handle, i, &(l_st->control[i]));
}
/* If needed, activate the plugin */
if (l_st->desc->activate)
l_st->desc->activate(l_st->handle);
return SOX_SUCCESS;
}
/*
* Process one bufferful of data.
*/
static int sox_ladspa_flow(sox_effect_t * effp, const sox_sample_t *ibuf, sox_sample_t *obuf,
size_t *isamp, size_t *osamp)
{
priv_t * l_st = (priv_t *)effp->priv;
size_t i, len = min(*isamp, *osamp);
*osamp = *isamp = len;
if (len) {
LADSPA_Data *buf = lsx_malloc(sizeof(LADSPA_Data) * len);
/* Insert input if effect takes it */
if (l_st->input_port != ULONG_MAX) {
/* Copy the input; FIXME: Assume LADSPA_Data == float! */
for (i = 0; i < len; i++)
buf[i] = SOX_SAMPLE_TO_FLOAT_32BIT(ibuf[i], effp->clips);
/* Connect the input port */
l_st->desc->connect_port(l_st->handle, l_st->input_port, buf);
}
/* Connect the output port if used */
if (l_st->output_port != ULONG_MAX)
l_st->desc->connect_port(l_st->handle, l_st->output_port, buf);
/* Run the plugin */
l_st->desc->run(l_st->handle, len);
/* Grab output if effect produces it */
if (l_st->output_port != ULONG_MAX)
/* FIXME: Assume LADSPA_Data == float! */
for (i = 0; i < len; i++) {
obuf[i] = SOX_FLOAT_32BIT_TO_SAMPLE(buf[i], effp->clips);
}
free(buf);
}
return SOX_SUCCESS;
}
/*
* Nothing to do.
*/
static int sox_ladspa_drain(sox_effect_t * effp UNUSED, sox_sample_t *obuf UNUSED, size_t *osamp)
{
*osamp = 0;
return SOX_SUCCESS;
}
/*
* Do anything required when you stop reading samples.
* Don't close input file!
*/
static int sox_ladspa_stop(sox_effect_t * effp)
{
priv_t * l_st = (priv_t *)effp->priv;
/* If needed, deactivate the plugin */
if (l_st->desc->deactivate)
l_st->desc->deactivate(l_st->handle);
return SOX_SUCCESS;
}
static sox_effect_handler_t sox_ladspa_effect = {
"ladspa",
"MODULE [PLUGIN] [ARGUMENT...]",
0,
sox_ladspa_getopts,
sox_ladspa_start,
sox_ladspa_flow,
sox_ladspa_drain,
sox_ladspa_stop,
NULL, sizeof(priv_t)
};
const sox_effect_handler_t *sox_ladspa_effect_fn(void)
{
return &sox_ladspa_effect;
}
#endif /* HAVE_LADSPA */