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ladspa: rewrite the directory scanning, fixes first part of #573370

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Move the two function from search.c into gstladspa.c and make them static.
Remove non needed arguments from function prototypes. Use glib api for
simplicity and portability.
This commit is contained in:
Stefan Kost 2009-03-04 14:34:12 +02:00
parent ccaa8de5aa
commit 86c5975ebe
4 changed files with 2 additions and 404 deletions
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4
ext/ladspa/Makefile.am
View file

@ -1,9 +1,9 @@
plugin_LTLIBRARIES = libgstladspa.la
libgstladspa_la_SOURCES = gstsignalprocessor.c gstladspa.c search.c #load.c
libgstladspa_la_SOURCES = gstsignalprocessor.c gstladspa.c
libgstladspa_la_CFLAGS = $(GST_PLUGINS_BASE_CFLAGS) $(GST_CONTROLLER_CFLAGS) $(GST_CFLAGS)
libgstladspa_la_LIBADD = $(GST_PLUGINS_BASE_LIBS) -lgstaudio-$(GST_MAJORMINOR) $(LIBM) $(LADSPA_LIBS)
libgstladspa_la_LDFLAGS = $(GST_PLUGIN_LDFLAGS)
libgstladspa_la_LIBTOOLFLAGS = --tag=disable-static
noinst_HEADERS = gstsignalprocessor.h gstladspa.h utils.h
noinst_HEADERS = gstsignalprocessor.h gstladspa.h

195
ext/ladspa/load.c
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@ -1,195 +0,0 @@
/* load.c
Free software by Richard W.E. Furse. Do with as you will. No
warranty. */
/*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <glib.h>
/*****************************************************************************/
#include "ladspa.h"
#include "utils.h"
/*****************************************************************************/
/* This function provides a wrapping of dlopen(). When the filename is
not an absolute path (i.e. does not begin with / character), this
routine will search the LADSPA_PATH for the file. */
static void *
dlopenLADSPA (const char *pcFilename, int iFlag)
{
char *pcBuffer;
const char *pcEnd;
const char *pcLADSPAPath;
const char *pcStart;
int iEndsInSO;
int iNeedSlash;
size_t iFilenameLength;
void *pvResult;
iFilenameLength = strlen (pcFilename);
pvResult = NULL;
if (pcFilename[0] == '/') {
/* The filename is absolute. Assume the user knows what he/she is
doing and simply dlopen() it. */
pvResult = dlopen (pcFilename, iFlag);
if (pvResult != NULL)
return pvResult;
} else {
/* If the filename is not absolute then we wish to check along the
LADSPA_PATH path to see if we can find the file there. We do
NOT call dlopen() directly as this would find plugins on the
LD_LIBRARY_PATH, whereas the LADSPA_PATH is the correct place
to search. */
/* thomasvs: I'm sorry, but I'm going to add glib stuff here.
* I'm appending logical values for LADSPA_PATH here
*/
pcLADSPAPath = g_strdup_printf ("%s:/usr/lib/ladspa:/usr/local/lib/ladspa",
getenv ("LADSPA_PATH"));
if (pcLADSPAPath) {
pcStart = pcLADSPAPath;
while (*pcStart != '\0') {
pcEnd = pcStart;
while (*pcEnd != ':' && *pcEnd != '\0')
pcEnd++;
pcBuffer = malloc (iFilenameLength + 2 + (pcEnd - pcStart));
if (pcEnd > pcStart)
strncpy (pcBuffer, pcStart, pcEnd - pcStart);
iNeedSlash = 0;
if (pcEnd > pcStart)
if (*(pcEnd - 1) != '/') {
iNeedSlash = 1;
pcBuffer[pcEnd - pcStart] = '/';
}
strcpy (pcBuffer + iNeedSlash + (pcEnd - pcStart), pcFilename);
pvResult = dlopen (pcBuffer, iFlag);
free (pcBuffer);
if (pvResult != NULL)
return pvResult;
pcStart = pcEnd;
if (*pcStart == ':')
pcStart++;
}
}
}
/* As a last ditch effort, check if filename does not end with
".so". In this case, add this suffix and recurse. */
iEndsInSO = 0;
if (iFilenameLength > 3)
iEndsInSO = (strcmp (pcFilename + iFilenameLength - 3, ".so") == 0);
if (!iEndsInSO) {
pcBuffer = malloc (iFilenameLength + 4);
strcpy (pcBuffer, pcFilename);
strcat (pcBuffer, ".so");
pvResult = dlopenLADSPA (pcBuffer, iFlag);
free (pcBuffer);
}
if (pvResult != NULL)
return pvResult;
/* If nothing has worked, then at least we can make sure we set the
correct error message - and this should correspond to a call to
dlopen() with the actual filename requested. The dlopen() manual
page does not specify whether the first or last error message
will be kept when multiple calls are made to dlopen(). We've
covered the former case - now we can handle the latter by calling
dlopen() again here. */
return dlopen (pcFilename, iFlag);
}
/*****************************************************************************/
void *
loadLADSPAPluginLibrary (const char *pcPluginFilename)
{
void *pvPluginHandle;
pvPluginHandle = dlopenLADSPA (pcPluginFilename, RTLD_NOW);
if (!pvPluginHandle) {
fprintf (stderr,
"Failed to load plugin \"%s\": %s\n", pcPluginFilename, dlerror ());
exit (1);
}
return pvPluginHandle;
}
/*****************************************************************************/
void
unloadLADSPAPluginLibrary (void *pvLADSPAPluginLibrary)
{
dlclose (pvLADSPAPluginLibrary);
}
/*****************************************************************************/
const LADSPA_Descriptor *
findLADSPAPluginDescriptor (void *pvLADSPAPluginLibrary,
const char *pcPluginLibraryFilename, const char *pcPluginLabel)
{
const LADSPA_Descriptor *psDescriptor;
LADSPA_Descriptor_Function pfDescriptorFunction;
unsigned long lPluginIndex;
dlerror ();
pfDescriptorFunction
= (LADSPA_Descriptor_Function) dlsym (pvLADSPAPluginLibrary,
"ladspa_descriptor");
if (!pfDescriptorFunction) {
const char *pcError = dlerror ();
if (pcError) {
fprintf (stderr,
"Unable to find ladspa_descriptor() function in plugin "
"library file \"%s\": %s.\n"
"Are you sure this is a LADSPA plugin file?\n",
pcPluginLibraryFilename, pcError);
exit (1);
}
}
for (lPluginIndex = 0;; lPluginIndex++) {
psDescriptor = pfDescriptorFunction (lPluginIndex);
if (psDescriptor == NULL) {
fprintf (stderr,
"Unable to find label \"%s\" in plugin library file \"%s\".\n",
pcPluginLabel, pcPluginLibraryFilename);
exit (1);
}
if (strcmp (psDescriptor->Label, pcPluginLabel) == 0)
return psDescriptor;
}
}
/*****************************************************************************/
/* EOF */

145
ext/ladspa/search.c
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@ -1,145 +0,0 @@
/* search.c
Free software by Richard W.E. Furse. Do with as you will. No
warranty. */
/*****************************************************************************/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <dirent.h>
#include <dlfcn.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#include <unistd.h>
#include <glib.h>
/*****************************************************************************/
#include "ladspa.h"
#include "utils.h"
/*****************************************************************************/
/* Search just the one directory. */
static void
LADSPADirectoryPluginSearch
(const char *pcDirectory,
LADSPAPluginSearchCallbackFunction fCallbackFunction)
{
char *pcFilename;
DIR *psDirectory;
LADSPA_Descriptor_Function fDescriptorFunction;
long lDirLength;
long iNeedSlash;
struct dirent *psDirectoryEntry;
void *pvPluginHandle;
lDirLength = strlen (pcDirectory);
if (!lDirLength)
return;
if (pcDirectory[lDirLength - 1] == '/')
iNeedSlash = 0;
else
iNeedSlash = 1;
psDirectory = opendir (pcDirectory);
if (!psDirectory)
return;
while (1) {
psDirectoryEntry = readdir (psDirectory);
if (!psDirectoryEntry) {
closedir (psDirectory);
return;
}
pcFilename = malloc (lDirLength + strlen (psDirectoryEntry->d_name)
+ 1 + iNeedSlash);
strcpy (pcFilename, pcDirectory);
if (iNeedSlash)
strcat (pcFilename, "/");
strcat (pcFilename, psDirectoryEntry->d_name);
pvPluginHandle = dlopen (pcFilename, RTLD_LAZY);
if (pvPluginHandle) {
/* This is a file and the file is a shared library! */
dlerror ();
fDescriptorFunction
= (LADSPA_Descriptor_Function) dlsym (pvPluginHandle,
"ladspa_descriptor");
if (dlerror () == NULL && fDescriptorFunction) {
/* We've successfully found a ladspa_descriptor function. Pass
it to the callback function. */
fCallbackFunction (pcFilename, pvPluginHandle, fDescriptorFunction);
} else {
/* It was a library, but not a LADSPA one. Unload it. */
dlclose (pvPluginHandle);
}
}
free (pcFilename);
}
}
/*****************************************************************************/
void
LADSPAPluginSearch (LADSPAPluginSearchCallbackFunction fCallbackFunction)
{
char *pcBuffer;
const char *pcEnd;
const char *pcLADSPAPath;
const char *pcStart;
char *search_path;
/* thomasvs: I'm sorry, but I'm going to add glib stuff here.
* I'm appending logical values for LADSPA_PATH here
*/
search_path = getenv ("LADSPA_PATH");
if (search_path) {
pcLADSPAPath = g_strdup_printf ("%s:/usr/lib/ladspa:/usr/local/lib/ladspa",
search_path);
} else {
pcLADSPAPath = g_strdup ("/usr/lib/ladspa:/usr/local/lib/ladspa");
}
if (!pcLADSPAPath) {
/* fprintf(stderr, */
/* "Warning: You do not have a LADSPA_PATH " */
/* "environment variable set.\n"); */
return;
}
pcStart = pcLADSPAPath;
while (*pcStart != '\0') {
pcEnd = pcStart;
while (*pcEnd != ':' && *pcEnd != '\0')
pcEnd++;
pcBuffer = malloc (1 + pcEnd - pcStart);
if (pcEnd > pcStart)
strncpy (pcBuffer, pcStart, pcEnd - pcStart);
pcBuffer[pcEnd - pcStart] = '\0';
LADSPADirectoryPluginSearch (pcBuffer, fCallbackFunction);
free (pcBuffer);
pcStart = pcEnd;
if (*pcStart == ':')
pcStart++;
}
g_free ((gpointer) pcLADSPAPath);
}
/*****************************************************************************/
/* EOF */

62
ext/ladspa/utils.h
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@ -1,62 +0,0 @@
/* utils.h
Free software by Richard W.E. Furse. Do with as you will. No
warranty. */
#ifndef LADSPA_SDK_LOAD_PLUGIN_LIB
#define LADSPA_SDK_LOAD_PLUGIN_LIB
/*****************************************************************************/
#include <ladspa.h>
/*****************************************************************************/
/* Functions in load.c: */
/* This function call takes a plugin library filename, searches for
the library along the LADSPA_PATH, loads it with dlopen() and
returns a plugin handle for use with findPluginDescriptor() or
unloadLADSPAPluginLibrary(). Errors are handled by writing a
message to stderr and calling exit(1). It is alright (although
inefficient) to call this more than once for the same file. */
void * loadLADSPAPluginLibrary(const char * pcPluginFilename);
/* This function unloads a LADSPA plugin library. */
void unloadLADSPAPluginLibrary(void * pvLADSPAPluginLibrary);
/* This function locates a LADSPA plugin within a plugin library
loaded with loadLADSPAPluginLibrary(). Errors are handled by
writing a message to stderr and calling exit(1). Note that the
plugin library filename is only included to help provide
informative error messages. */
const LADSPA_Descriptor *
findLADSPAPluginDescriptor(void * pvLADSPAPluginLibrary,
const char * pcPluginLibraryFilename,
const char * pcPluginLabel);
/*****************************************************************************/
/* Functions in search.c: */
/* Callback function for use with LADSPAPluginSearch(). The callback
function passes the filename (full path), a plugin handle (dlopen()
style) and a LADSPA_DescriptorFunction (from which
LADSPA_Descriptors can be acquired). */
typedef void LADSPAPluginSearchCallbackFunction
(const char * pcFullFilename,
void * pvPluginHandle,
LADSPA_Descriptor_Function fDescriptorFunction);
/* Search through the $(LADSPA_PATH) (or a default path) for any
LADSPA plugin libraries. Each plugin library is tested using
dlopen() and dlsym(,"ladspa_descriptor"). After loading each
library, the callback function is called to process it. This
function leaves items passed to the callback function open. */
void LADSPAPluginSearch(LADSPAPluginSearchCallbackFunction fCallbackFunction);
/*****************************************************************************/
#endif
/* EOF */