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/*
Copyright (C) 2000 Stefan Westerfeld
stefan@space.twc.de
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public License
along with this library; see the file COPYING.LIB. If not, write to
the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA.
*/
#include "artsc.h"
#include "ltdl.h"
#include <assert.h>
typedef int (*backend_init_ptr)();
typedef int (*backend_suspend_ptr)();
typedef int (*backend_suspended_ptr)();
typedef void (*backend_free_ptr)();
typedef arts_stream_t (*backend_play_stream_ptr)(int,int,int,const char*);
typedef arts_stream_t (*backend_record_stream_ptr)(int,int,int,const char*);
typedef void (*backend_close_stream_ptr)(arts_stream_t);
typedef int (*backend_read_ptr)(arts_stream_t,void*,int);
typedef int (*backend_write_ptr)(arts_stream_t,const void*,int);
typedef int (*backend_stream_set_ptr)(arts_stream_t, arts_parameter_t, int);
typedef int (*backend_stream_get_ptr)(arts_stream_t, arts_parameter_t);
static struct arts_backend {
int available;
int refcnt;
lt_dlhandle handle;
backend_init_ptr init;
backend_suspend_ptr suspend;
backend_suspended_ptr suspended;
backend_free_ptr free;
backend_play_stream_ptr play_stream;
backend_record_stream_ptr record_stream;
backend_close_stream_ptr close_stream;
backend_read_ptr read;
backend_write_ptr write;
backend_stream_set_ptr stream_set;
backend_stream_get_ptr stream_get;
} backend = { 0,0,0,0,0,0,0,0,0,0,0,0,0,0 };
static void arts_backend_ref()
{
if(backend.refcnt == 0)
{
lt_dlinit();
backend.handle = lt_dlopen(ARTSC_BACKEND);
if(backend.handle)
{
backend.init = (backend_init_ptr)
lt_dlsym(backend.handle, "arts_backend_init");
backend.suspend = (backend_suspend_ptr)
lt_dlsym(backend.handle, "arts_backend_suspend");
backend.suspended = (backend_suspended_ptr)
lt_dlsym(backend.handle, "arts_backend_suspended");
backend.free = (backend_free_ptr)
lt_dlsym(backend.handle, "arts_backend_free");
backend.play_stream = (backend_play_stream_ptr)
lt_dlsym(backend.handle, "arts_backend_play_stream");
backend.record_stream = (backend_record_stream_ptr)
lt_dlsym(backend.handle, "arts_backend_record_stream");
backend.close_stream = (backend_close_stream_ptr)
lt_dlsym(backend.handle, "arts_backend_close_stream");
backend.write = (backend_write_ptr)
lt_dlsym(backend.handle, "arts_backend_write");
backend.read = (backend_read_ptr)
lt_dlsym(backend.handle, "arts_backend_read");
backend.stream_set = (backend_stream_set_ptr)
lt_dlsym(backend.handle, "arts_backend_stream_set");
backend.stream_get = (backend_stream_get_ptr)
lt_dlsym(backend.handle, "arts_backend_stream_get");
}
if(backend.handle && backend.init && backend.free && backend.play_stream
&& backend.record_stream && backend.close_stream && backend.write
&& backend.read && backend.stream_set && backend.stream_get
&& backend.suspend)
backend.available = 1;
else
backend.available = 0;
}
backend.refcnt++;
}
static void arts_backend_release()
{
assert(backend.refcnt > 0);
backend.refcnt--;
if(backend.refcnt == 0)
{
if(backend.available)
{
backend.available = 0;
if(backend.handle) lt_dlclose(backend.handle);
}
lt_dlexit();
}
}
int arts_init()
{
int rc = ARTS_E_NOBACKEND;
arts_backend_ref();
if(backend.available) rc = backend.init();
/* init failed: the user may not call other arts_xxx functions now */
if(rc < 0) arts_backend_release();
return rc;
}
int arts_suspend()
{
int rc = ARTS_E_NOBACKEND;
if(backend.available) rc = backend.suspend();
return rc;
}
int arts_suspended()
{
int rc = ARTS_E_NOBACKEND;
if(backend.available && backend.suspended) rc = backend.suspended();
return rc;
}
void arts_free()
{
if(backend.available)
{
backend.free();
arts_backend_release();
}
}
arts_stream_t arts_play_stream(int rate, int bits, int channels, const char *name)
{
arts_stream_t rc = 0;
if(backend.available) rc = backend.play_stream(rate,bits,channels,name);
return rc;
}
arts_stream_t arts_record_stream(int rate, int bits, int channels, const char *name)
{
arts_stream_t rc = 0;
if(backend.available) rc = backend.record_stream(rate,bits,channels,name);
return rc;
}
void arts_close_stream(arts_stream_t stream)
{
if(backend.available) backend.close_stream(stream);
}
int arts_read(arts_stream_t stream, void *buffer, int count)
{
int rc = ARTS_E_NOBACKEND;
if(backend.available) rc = backend.read(stream,buffer,count);
return rc;
}
int arts_write(arts_stream_t stream, const void *buffer, int count)
{
int rc = ARTS_E_NOBACKEND;
if(backend.available) rc = backend.write(stream,buffer,count);
return rc;
}
int arts_stream_set(arts_stream_t stream, arts_parameter_t param, int value)
{
int rc = ARTS_E_NOBACKEND;
if(backend.available) rc = backend.stream_set(stream,param,value);
return rc;
}
int arts_stream_get(arts_stream_t stream, arts_parameter_t param)
{
int rc = ARTS_E_NOBACKEND;
if(backend.available) rc = backend.stream_get(stream,param);
return rc;
}
const char *arts_error_text(int errorcode)
{
switch(errorcode) {
case 0:
return "success";
case ARTS_E_NOSERVER:
return "can't connect to aRts soundserver";
case ARTS_E_NOBACKEND:
return "loading the aRts backend \""
ARTSC_BACKEND "\" failed";
case ARTS_E_NOIMPL:
return "this aRts function is not yet implemented";
case ARTS_E_NOINIT:
return "need to use arts_init() before using other functions";
case ARTS_E_NOSTREAM:
return "you passed no valid aRts stream to a function";
}
return "unknown arts error happened";
}
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