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/*
* Pure Data Packet module.
* Copyright (c) by Tom Schouten <tom@zwizwa.be>
*
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*
*/
/* this module sends receives an udp packet stream and converts to pdp packet */
#include "pdp_net.h"
#include "pdp.h"
#include "pdp_resample.h"
#define D if(0)
typedef struct pdp_udp_receive_struct
{
t_object x_obj;
t_float x_f;
/* receiver object */
t_pdp_udp_receiver *x_receiver;
/* thread vars */
pthread_attr_t x_attr;
pthread_t x_thread;
int x_exit_thread;
/* packet queue */
int x_index;
int x_packet[2];
/* polling clock */
t_clock *x_clock;
/* outlet */
t_outlet *x_outlet0;
} t_pdp_udp_receive;
static void clock_tick(t_pdp_udp_receive *x)
{
/* poll for new packet */
pdp_pass_if_valid(x->x_outlet0, &x->x_packet[!x->x_index]);
clock_delay(x->x_clock, 1.0f);
}
static void *receive_thread(void *threaddata)
{
t_pdp_udp_receive *x = (t_pdp_udp_receive *)threaddata;
t_pdp *pdp_header = 0;
void *pdp_data = 0;
int tmp_packet = -1;
char *type = 0;
unsigned int size = 0;
/* listen for packets */
while (!x->x_exit_thread){
switch(pdp_udp_receiver_receive(x->x_receiver, 100)){
case -1:
/* error */
goto exit;
case 0:
/* timeout */
continue;
case 1:
/* data ready */
break;
}
/* create a new packet */
type = pdp_udp_receiver_type(x->x_receiver);
tmp_packet = pdp_factory_newpacket(pdp_gensym(type));
pdp_header = pdp_packet_header(tmp_packet);
pdp_data = pdp_packet_data(tmp_packet);
/* check if we were able to create the pdp packet */
if (!(pdp_header && pdp_data)){
post("pdp_netreceive: can't create packet (type %s)", type);
pdp_udp_receiver_reset(x->x_receiver);
continue;
}
/* check size */
size = pdp_udp_receiver_size(x->x_receiver);
if ((pdp_header->size - PDP_HEADER_SIZE) != size){
pdp_packet_mark_unused(tmp_packet);
tmp_packet = -1;
post("pdp_netreceive: invalid packet size %d (pdp packet size = %d)",
size, pdp_header->size - PDP_HEADER_SIZE);
continue;
}
/* copy the data */
memcpy(pdp_data, pdp_udp_receiver_data(x->x_receiver), size);
/* copy the packet into queue */
x->x_index ^= 1;
pdp_packet_mark_unused(x->x_packet[x->x_index]);
x->x_packet[x->x_index] = tmp_packet;
}
exit:
post("thread exiting");
return 0;
}
static void pdp_udp_receive_free(t_pdp_udp_receive *x)
{
int i;
void* retval;
x->x_exit_thread = 1; // wait for thread to finish
pthread_join(x->x_thread, &retval);
pdp_udp_receiver_free(x->x_receiver);
pdp_packet_mark_unused(x->x_packet[0]);
pdp_packet_mark_unused(x->x_packet[1]);
}
t_class *pdp_udp_receive_class;
void *pdp_udp_receive_new(t_floatarg fport)
{
int i;
int port;
struct hostent *hp;
t_pdp_udp_receive *x = (t_pdp_udp_receive *)pd_new(pdp_udp_receive_class);
x->x_outlet0 = outlet_new(&x->x_obj, &s_anything);
x->x_packet[0] = -1;
x->x_packet[1] = -1;
x->x_index = 0;
port = (fport == 0.0f) ? 7777 : fport;
x->x_receiver = pdp_udp_receiver_new(port);
/* setup thread stuff & create thread */
x->x_exit_thread = 0;
pthread_attr_init(&x->x_attr);
pthread_attr_setschedpolicy(&x->x_attr, SCHED_OTHER);
pthread_create(&x->x_thread, &x->x_attr, receive_thread, x);
/* setup the clock */
x->x_clock = clock_new(x, (t_method)clock_tick);
clock_delay(x->x_clock, 0);
post("pdp_netreceive: WARNING: experimental object");
return (void *)x;
}
#ifdef __cplusplus
extern "C"
{
#endif
void pdp_udp_receive_setup(void)
{
pdp_udp_receive_class = class_new(gensym("pdp_netreceive"), (t_newmethod)pdp_udp_receive_new,
(t_method)pdp_udp_receive_free, sizeof(t_pdp_udp_receive), 0, A_DEFFLOAT, A_NULL);
}
#ifdef __cplusplus
}
#endif
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