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vdr-plugin-iptv/protocoludp.c

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/*
* protocoludp.c: IPTV plugin for the Video Disk Recorder
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*
* See the README file for copyright information and how to reach the author.
*
* $Id: protocoludp.c,v 1.14 2007/10/20 11:36:21 ajhseppa Exp $
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*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
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#include "common.h"
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#include "config.h"
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#include "protocoludp.h"
cIptvProtocolUdp::cIptvProtocolUdp()
: streamPort(1234),
socketDesc(-1),
readBufferLen(TS_SIZE * IptvConfig.GetReadBufferTsCount()),
isActive(false)
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{
debug("cIptvProtocolUdp::cIptvProtocolUdp()\n");
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streamAddr = strdup("");
// Allocate receive buffer
readBuffer = MALLOC(unsigned char, readBufferLen);
if (!readBuffer)
error("ERROR: MALLOC() failed in ProtocolUdp()");
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}
cIptvProtocolUdp::~cIptvProtocolUdp()
{
debug("cIptvProtocolUdp::~cIptvProtocolUdp()\n");
// Drop the multicast group and close the socket
Close();
// Free allocated memory
free(streamAddr);
free(readBuffer);
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}
bool cIptvProtocolUdp::OpenSocket(const int Port)
{
debug("cIptvProtocolUdp::OpenSocket()\n");
// If socket is there already and it is bound to a different port, it must
// be closed first
if (Port != streamPort) {
debug("cIptvProtocolUdp::OpenSocket(): Socket tear-down\n");
CloseSocket();
}
// Bind to the socket if it is not active already
if (socketDesc < 0) {
int yes = 1;
// Create socket
socketDesc = socket(PF_INET, SOCK_DGRAM, 0);
if (socketDesc < 0) {
char tmp[64];
error("ERROR: socket(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Make it use non-blocking I/O to avoid stuck read calls
if (fcntl(socketDesc, F_SETFL, O_NONBLOCK)) {
char tmp[64];
error("ERROR: fcntl(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Allow multiple sockets to use the same PORT number
if (setsockopt(socketDesc, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(yes)) < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Bind socket
memset(&sockAddr, '\0', sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons(Port);
sockAddr.sin_addr.s_addr = htonl(INADDR_ANY);
int err = bind(socketDesc, (struct sockaddr *)&sockAddr, sizeof(sockAddr));
if (err < 0) {
char tmp[64];
error("ERROR: bind(): %s", strerror_r(errno, tmp, sizeof(tmp)));
CloseSocket();
return false;
}
// Update stream port
streamPort = Port;
}
return true;
}
void cIptvProtocolUdp::CloseSocket(void)
{
debug("cIptvProtocolUdp::CloseSocket()\n");
// Check if socket exists
if (socketDesc >= 0) {
close(socketDesc);
socketDesc = -1;
}
}
bool cIptvProtocolUdp::JoinMulticast(void)
{
debug("cIptvProtocolUdp::JoinMulticast()\n");
// Check that stream address is valid
if (!isActive && !isempty(streamAddr)) {
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// Ensure that socket is valid
OpenSocket(streamPort);
// Join a new multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
int err = setsockopt(socketDesc, IPPROTO_IP, IP_ADD_MEMBERSHIP, &mreq,
sizeof(mreq));
if (err < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Update multicasting flag
isActive = true;
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}
return true;
}
bool cIptvProtocolUdp::DropMulticast(void)
{
debug("cIptvProtocolUdp::DropMulticast()\n");
// Check that stream address is valid
if (isActive && !isempty(streamAddr)) {
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// Ensure that socket is valid
OpenSocket(streamPort);
// Drop the multicast group
struct ip_mreq mreq;
mreq.imr_multiaddr.s_addr = inet_addr(streamAddr);
mreq.imr_interface.s_addr = htonl(INADDR_ANY);
int err = setsockopt(socketDesc, IPPROTO_IP, IP_DROP_MEMBERSHIP, &mreq,
sizeof(mreq));
if (err < 0) {
char tmp[64];
error("ERROR: setsockopt(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return false;
}
// Update multicasting flag
isActive = false;
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}
return true;
}
int cIptvProtocolUdp::Read(unsigned char* *BufferAddr)
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{
//debug("cIptvProtocolUdp::Read()\n");
// Error out if socket not initialized
if (socketDesc <= 0) {
error("ERROR: Invalid socket in %s\n", __FUNCTION__);
return -1;
}
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socklen_t addrlen = sizeof(sockAddr);
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// Set argument point to read buffer
*BufferAddr = readBuffer;
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// Wait for data
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 500000;
// Use select
fd_set rfds;
FD_ZERO(&rfds);
FD_SET(socketDesc, &rfds);
int retval = select(socketDesc + 1, &rfds, NULL, NULL, &tv);
// Check if error
if (retval < 0) {
char tmp[64];
error("ERROR: select(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return retval;
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}
// Check if data available
else if (retval) {
int len = 0;
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// Read data from socket
if (isActive)
len = recvfrom(socketDesc, readBuffer, readBufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
if (len < 0) {
char tmp[64];
error("ERROR: recvfrom(): %s", strerror_r(errno, tmp, sizeof(tmp)));
return len;
}
else if ((len > 0) && (readBuffer[0] == 0x47)) {
// Set argument point to read buffer
*BufferAddr = &readBuffer[0];
return len;
}
else if (len > 3) {
// http://www.networksorcery.com/enp/rfc/rfc2250.txt
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// version
unsigned int v = (readBuffer[0] >> 6) & 0x03;
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// extension bit
unsigned int x = (readBuffer[0] >> 4) & 0x01;
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// cscr count
unsigned int cc = readBuffer[0] & 0x0F;
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// payload type
unsigned int pt = readBuffer[1] & 0x7F;
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// header lenght
unsigned int headerlen = (3 + cc) * sizeof(uint32_t);
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// check if extension
if (x) {
// extension header length
unsigned int ehl = (((readBuffer[headerlen + 2] & 0xFF) << 8) | (readBuffer[headerlen + 3] & 0xFF));
// update header length
headerlen += (ehl + 1) * sizeof(uint32_t);
}
// Check that rtp is version 2, payload type is MPEG2 TS
// and payload contains multiple of TS packet data
if ((v == 2) && (pt == 33) && (((len - headerlen) % TS_SIZE) == 0)) {
// Set argument point to payload in read buffer
*BufferAddr = &readBuffer[headerlen];
return (len - headerlen);
}
}
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}
return 0;
}
bool cIptvProtocolUdp::Open(void)
{
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debug("cIptvProtocolUdp::Open()\n");
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// Join a new multicast group
JoinMulticast();
return true;
}
bool cIptvProtocolUdp::Close(void)
{
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debug("cIptvProtocolUdp::Close()\n");
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// Drop the multicast group
DropMulticast();
// Close the socket
CloseSocket();
return true;
}
bool cIptvProtocolUdp::Set(const char* Location, const int Parameter, const int Index)
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{
debug("cIptvProtocolUdp::Set(): Location=%s Parameter=%d Index=%d\n", Location, Parameter, Index);
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if (!isempty(Location)) {
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// Drop the multicast group
DropMulticast();
// Update stream address and port
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streamAddr = strcpyrealloc(streamAddr, Location);
streamPort = Parameter;
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// Join a new multicast group
JoinMulticast();
}
return true;
}
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cString cIptvProtocolUdp::GetInformation(void)
{
//debug("cIptvProtocolUdp::GetInformation()");
return cString::sprintf("udp://%s:%d", streamAddr, streamPort);
}