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vdr-plugin-satip/socket.c

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/*
* socket.c: SAT>IP plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <net/if.h>
#include <netdb.h>
#include <fcntl.h>
#include <unistd.h>
#include <vdr/device.h>
#include "common.h"
#include "config.h"
#include "socket.h"
cSatipSocket::cSatipSocket()
: socketPortM(0),
socketDescM(-1),
lastErrorReportM(0),
packetErrorsM(0),
sequenceNumberM(-1)
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{
debug("cSatipSocket::%s()", __FUNCTION__);
memset(&sockAddrM, 0, sizeof(sockAddrM));
}
cSatipSocket::~cSatipSocket()
{
debug("cSatipSocket::%s()", __FUNCTION__);
// Close the socket
Close();
}
bool cSatipSocket::Open(const int portP)
{
// Bind to the socket if it is not active already
if (socketDescM < 0) {
socklen_t len = sizeof(sockAddrM);
// Create socket
socketDescM = socket(PF_INET, SOCK_DGRAM, 0);
ERROR_IF_RET(socketDescM < 0, "socket()", return false);
// Make it use non-blocking I/O to avoid stuck read calls
ERROR_IF_FUNC(fcntl(socketDescM, F_SETFL, O_NONBLOCK), "fcntl(O_NONBLOCK)",
Close(), return false);
// Allow multiple sockets to use the same PORT number
int yes = 1;
ERROR_IF_FUNC(setsockopt(socketDescM, SOL_SOCKET, SO_REUSEADDR, &yes, sizeof(yes)) < 0,
"setsockopt(SO_REUSEADDR)", Close(), return false);
// Bind socket
memset(&sockAddrM, 0, sizeof(sockAddrM));
sockAddrM.sin_family = AF_INET;
sockAddrM.sin_port = htons((uint16_t)(portP & 0xFFFF));
sockAddrM.sin_addr.s_addr = htonl(INADDR_ANY);
ERROR_IF_FUNC(bind(socketDescM, (struct sockaddr *)&sockAddrM, sizeof(sockAddrM)) < 0,
"bind()", Close(), return false);
// Update socket port
ERROR_IF_FUNC(getsockname(socketDescM,(struct sockaddr*)&sockAddrM, &len) < 0,
"getsockname()", Close(), return false);
socketPortM = ntohs(sockAddrM.sin_port);
}
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debug("cSatipSocket::%s(%d): socketPort=%d", __FUNCTION__, portP, socketPortM);
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return true;
}
void cSatipSocket::Close(void)
{
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debug("cSatipSocket::%s(%d)", __FUNCTION__, socketPortM);
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// Check if socket exists
if (socketDescM >= 0) {
close(socketDescM);
socketDescM = -1;
socketPortM = 0;
sequenceNumberM = -1;
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memset(&sockAddrM, 0, sizeof(sockAddrM));
}
if (packetErrorsM) {
info("detected %d RTP packet errors", packetErrorsM);
packetErrorsM = 0;
lastErrorReportM = time(NULL);
}
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}
bool cSatipSocket::Flush(void)
{
debug("cSatipSocket::%s()", __FUNCTION__);
if (socketDescM < 0) {
const unsigned int len = 65535;
unsigned char *buf = MALLOC(unsigned char, len);
if (buf) {
int i = 0;
do {
// Sanity check
if (++i > 10)
break;
} while (Read(buf, len));
return true;
}
}
return false;
}
int cSatipSocket::Read(unsigned char *bufferAddrP, unsigned int bufferLenP)
{
//debug("cSatipSocket::%s()", __FUNCTION__);
// Error out if socket not initialized
if (socketDescM <= 0) {
error("Invalid socket in cSatipUdpSocket::%s()", __FUNCTION__);
return -1;
}
int len = 0;
// Read data from socket in a loop
do {
socklen_t addrlen = sizeof(sockAddrM);
struct msghdr msgh;
struct iovec iov;
char cbuf[256];
len = 0;
// Initialize iov and msgh structures
memset(&msgh, 0, sizeof(struct msghdr));
iov.iov_base = bufferAddrP;
iov.iov_len = bufferLenP;
msgh.msg_control = cbuf;
msgh.msg_controllen = sizeof(cbuf);
msgh.msg_name = &sockAddrM;
msgh.msg_namelen = addrlen;
msgh.msg_iov = &iov;
msgh.msg_iovlen = 1;
msgh.msg_flags = 0;
if (socketDescM && bufferAddrP && (bufferLenP > 0))
len = (int)recvmsg(socketDescM, &msgh, MSG_DONTWAIT);
if (len > 0)
return len;
} while (len > 0);
ERROR_IF_RET(len < 0 && errno != EAGAIN, "recvmsg()", return -1);
return 0;
}
int cSatipSocket::ReadVideo(unsigned char *bufferAddrP, unsigned int bufferLenP)
{
//debug("cSatipSocket::%s()", __FUNCTION__);
int len = Read(bufferAddrP, bufferLenP);
if (len > 0) {
if (bufferAddrP[0] == TS_SYNC_BYTE)
return len;
else if (len > 3) {
// http://tools.ietf.org/html/rfc3550
// http://tools.ietf.org/html/rfc2250
// Version
unsigned int v = (bufferAddrP[0] >> 6) & 0x03;
// Extension bit
unsigned int x = (bufferAddrP[0] >> 4) & 0x01;
// CSCR count
unsigned int cc = bufferAddrP[0] & 0x0F;
// Payload type: MPEG2 TS = 33
//unsigned int pt = bufferAddrP[1] & 0x7F;
// Sequence number
int seq = ((bufferAddrP[2] & 0xFF) << 8) | (bufferAddrP[3] & 0xFF);
if ((((sequenceNumberM + 1) % 0xFFFF) == 0) && (seq == 0xFFFF))
sequenceNumberM = -1;
else if ((sequenceNumberM >= 0) && (((sequenceNumberM + 1) % 0xFFFF) != seq)) {
packetErrorsM++;
if (time(NULL) - lastErrorReportM > eReportIntervalS) {
info("detected %d RTP packet errors", packetErrorsM);
packetErrorsM = 0;
lastErrorReportM = time(NULL);
}
sequenceNumberM = seq;
}
else
sequenceNumberM = seq;
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// Header lenght
unsigned int headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t);
// Check if extension
if (x) {
// Extension header length
unsigned int ehl = (((bufferAddrP[headerlen + 2] & 0xFF) << 8) |
(bufferAddrP[headerlen + 3] & 0xFF));
// Update header length
headerlen += (ehl + 1) * (unsigned int)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) &&
(bufferAddrP[headerlen] == TS_SYNC_BYTE)) {
// Set argument point to payload in read buffer
memmove(bufferAddrP, &bufferAddrP[headerlen], (len - headerlen));
return (len - headerlen);
}
}
}
return 0;
}
int cSatipSocket::ReadApplication(unsigned char *bufferAddrP, unsigned int bufferLenP)
{
//debug("cSatipSocket::%s()", __FUNCTION__);
int len = Read(bufferAddrP, bufferLenP);
int offset = 0;
while (len > 0) {
// Version
unsigned int v = (bufferAddrP[offset] >> 6) & 0x03;
// Padding
//unsigned int p = (bufferAddrP[offset] >> 5) & 0x01;
// Subtype
//unsigned int st = bufferAddrP[offset] & 0x1F;
// Payload type
unsigned int pt = bufferAddrP[offset + 1] & 0xFF;
// Lenght
unsigned int length = ((bufferAddrP[offset + 2] & 0xFF) << 8) | (bufferAddrP[offset + 3] & 0xFF);
// Convert it to bytes
length = (length + 1) * 4;
// V=2, APP = 204
if ((v == 2) && (pt == 204)) {
// SSCR/CSCR
//unsigned int ssrc = ((bufferAddrP[offset + 4] & 0xFF) << 24) | ((bufferAddrP[offset + 5] & 0xFF) << 16) |
// ((bufferAddrP[offset + 6] & 0xFF) << 8) | (bufferAddrP[offset + 7] & 0xFF);
// Name
if ((bufferAddrP[offset + 8] == 'S') && (bufferAddrP[offset + 9] == 'E') &&
(bufferAddrP[offset + 10] == 'S') && (bufferAddrP[offset + 11] == '1')) {
// Identifier
//unsigned int id = ((bufferAddrP[offset + 12] & 0xFF) << 8) | (bufferAddrP[offset + 13] & 0xFF);
// String length
int string_length = ((bufferAddrP[offset + 14] & 0xFF) << 8) | (bufferAddrP[offset + 15] & 0xFF);
if (string_length > 0) {
// Set argument point to payload in read buffer
memmove(bufferAddrP, &bufferAddrP[offset + 16], string_length);
bufferAddrP[string_length] = 0;
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return string_length;
}
}
}
offset += length;
len -= length;
}
return 0;
}
bool cSatipSocket::Write(const char *addrP, const unsigned char *bufferAddrP, unsigned int bufferLenP)
{
debug("cSatipSocket::%s(%s)", __FUNCTION__, addrP);
// Error out if socket not initialized
if (socketDescM <= 0) {
error("cSatipSocket::%s(): Invalid socket", __FUNCTION__);
return false;
}
struct sockaddr_in sockAddr;
memset(&sockAddr, 0, sizeof(sockAddr));
sockAddr.sin_family = AF_INET;
sockAddr.sin_port = htons((uint16_t)(socketPortM & 0xFFFF));
sockAddr.sin_addr.s_addr = inet_addr(addrP);
ERROR_IF_RET(sendto(socketDescM, bufferAddrP, bufferLenP, 0, (struct sockaddr *)&sockAddr, sizeof(sockAddr)) < 0, "sendto()", return false);
return true;
}