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vdr-plugin-iptv/socket.c

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/*
* socket.c: IPTV plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
* $Id: socket.c,v 1.6 2007/10/26 22:07:10 rahrenbe Exp $
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
#include "common.h"
#include "config.h"
#include "socket.h"
cIptvSocket::cIptvSocket()
: socketPort(0),
socketDesc(-1),
readBufferLen(TS_SIZE * IptvConfig.GetReadBufferTsCount()),
isActive(false)
{
debug("cIptvSocket::cIptvSocket()\n");
// Allocate receive buffer
readBuffer = MALLOC(unsigned char, readBufferLen);
if (!readBuffer)
error("ERROR: MALLOC() failed in socket()");
}
cIptvSocket::~cIptvSocket()
{
debug("cIptvSocket::~cIptvSocket()\n");
// Close the socket
CloseSocket();
// Free allocated memory
free(readBuffer);
}
bool cIptvSocket::OpenSocket(const int Port, const bool isUdp)
{
debug("cIptvSocket::OpenSocket()\n");
// If socket is there already and it is bound to a different port, it must
// be closed first
if (Port != socketPort) {
debug("cIptvSocket::OpenSocket(): Socket tear-down\n");
CloseSocket();
}
// Bind to the socket if it is not active already
if (socketDesc < 0) {
int yes = 1;
// Create socket
if (isUdp)
socketDesc = socket(PF_INET, SOCK_DGRAM, 0);
else
socketDesc = socket(PF_INET, SOCK_STREAM, 0);
ERROR_IF_RET(socketDesc < 0, "socket()", return false);
// Make it use non-blocking I/O to avoid stuck read calls
ERROR_IF_FUNC(fcntl(socketDesc, F_SETFL, O_NONBLOCK), "fcntl()", CloseSocket(), return false);
// Allow multiple sockets to use the same PORT number
ERROR_IF_FUNC(setsockopt(socketDesc, SOL_SOCKET, SO_REUSEADDR, &yes,
sizeof(yes)) < 0, "setsockopt()", 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);
if (isUdp) {
int err = bind(socketDesc, (struct sockaddr *)&sockAddr, sizeof(sockAddr));
ERROR_IF_FUNC(err < 0, "bind()", CloseSocket(), return false);
}
// Update socket port
socketPort = Port;
}
return true;
}
void cIptvSocket::CloseSocket(void)
{
debug("cIptvSocket::CloseSocket()\n");
// Check if socket exists
if (socketDesc >= 0) {
close(socketDesc);
socketDesc = -1;
}
}
// UDP socket class
cIptvUdpSocket::cIptvUdpSocket()
{
debug("cIptvUdpSocket::cIptvUdpSocket()\n");
}
cIptvUdpSocket::~cIptvUdpSocket()
{
debug("cIptvUdpSocket::~cIptvUdpSocket()\n");
}
bool cIptvUdpSocket::OpenSocket(const int Port)
{
debug("cIptvUdpSocket::OpenSocket()\n");
return cIptvSocket::OpenSocket(Port, true);
}
int cIptvUdpSocket::Read(unsigned char* *BufferAddr)
{
//debug("cIptvUdpSocket::Read()\n");
// Error out if socket not initialized
if (socketDesc <= 0) {
error("ERROR: Invalid socket in %s\n", __FUNCTION__);
return -1;
}
socklen_t addrlen = sizeof(sockAddr);
// Set argument point to read buffer
*BufferAddr = readBuffer;
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// Wait 500ms for data
int retval = select_single_desc(socketDesc, 500000, false);
// Check if error
if (retval < 0)
return retval;
// Check if data available
else if (retval) {
int len = 0;
// Read data from socket
if (isActive)
len = recvfrom(socketDesc, readBuffer, readBufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
ERROR_IF_RET(len < 0, "recvfrom()", return len);
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
// version
unsigned int v = (readBuffer[0] >> 6) & 0x03;
// extension bit
unsigned int x = (readBuffer[0] >> 4) & 0x01;
// cscr count
unsigned int cc = readBuffer[0] & 0x0F;
// payload type: MPEG2 TS = 33
//unsigned int pt = readBuffer[1] & 0x7F;
// header lenght
unsigned int headerlen = (3 + cc) * sizeof(uint32_t);
// 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 and payload contains multiple of TS packet data
if ((v == 2) && (((len - headerlen) % TS_SIZE) == 0) && (readBuffer[headerlen] == 0x47)) {
// Set argument point to payload in read buffer
*BufferAddr = &readBuffer[headerlen];
return (len - headerlen);
}
}
}
return 0;
}
// TCP socket class
cIptvTcpSocket::cIptvTcpSocket()
{
debug("cIptvTcpSocket::cIptvTcpSocket()\n");
}
cIptvTcpSocket::~cIptvTcpSocket()
{
debug("cIptvTcpSocket::~cIptvTcpSocket()\n");
}
bool cIptvTcpSocket::OpenSocket(const int Port)
{
debug("cIptvTcpSocket::OpenSocket()\n");
return cIptvSocket::OpenSocket(Port, false);
}
int cIptvTcpSocket::Read(unsigned char* *BufferAddr)
{
//debug("cIptvTcpSocket::Read()\n");
// Error out if socket not initialized
if (socketDesc <= 0) {
error("ERROR: Invalid socket in %s\n", __FUNCTION__);
return -1;
}
socklen_t addrlen = sizeof(sockAddr);
// Set argument point to read buffer
*BufferAddr = readBuffer;
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// Wait 500ms for data
int retval = select_single_desc(socketDesc, 500000, false);
// Check if error
if (retval < 0)
return retval;
// Check if data available
else if (retval) {
// Read data from socket
if (isActive)
return recvfrom(socketDesc, readBuffer, readBufferLen, MSG_DONTWAIT,
(struct sockaddr *)&sockAddr, &addrlen);
}
return 0;
}