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Try to read all data from udp socket at once

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Existing implementation of udp read mechanism was giving up too easily.
Replaced it with version that tries more actively to drain the entire socket buffer.

Signed-off-by: Antti Seppälä <a.seppala@gmail.com>
This commit is contained in:
Antti Seppälä 2012-06-02 14:24:29 +03:00 committed by Rolf Ahrenberg
parent c7cbde301b
commit f4126b7e2c
1 changed files with 67 additions and 63 deletions
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130
socket.c
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@ -154,70 +154,74 @@ int cIptvUdpSocket::Read(unsigned char* BufferAddr, unsigned int BufferLen)
error("Invalid socket in %s\n", __FUNCTION__); error("Invalid socket in %s\n", __FUNCTION__);
return -1; return -1;
} }
socklen_t addrlen = sizeof(sockAddr);
int len = 0; int len = 0;
struct msghdr msgh; // Read data from socket in a loop
struct cmsghdr *cmsg; do {
struct iovec iov; socklen_t addrlen = sizeof(sockAddr);
char cbuf[256]; struct msghdr msgh;
// Initialize iov and msgh structures struct cmsghdr *cmsg;
memset(&msgh, 0, sizeof(struct msghdr)); struct iovec iov;
iov.iov_base = BufferAddr; char cbuf[256];
iov.iov_len = BufferLen; len = 0;
msgh.msg_control = cbuf; // Initialize iov and msgh structures
msgh.msg_controllen = sizeof(cbuf); memset(&msgh, 0, sizeof(struct msghdr));
msgh.msg_name = &sockAddr; iov.iov_base = BufferAddr;
msgh.msg_namelen = addrlen; iov.iov_len = BufferLen;
msgh.msg_iov = &iov; msgh.msg_control = cbuf;
msgh.msg_iovlen = 1; msgh.msg_controllen = sizeof(cbuf);
msgh.msg_flags = 0; msgh.msg_name = &sockAddr;
// Read data from socket msgh.msg_namelen = addrlen;
if (isActive && socketDesc && BufferAddr && (BufferLen > 0)) msgh.msg_iov = &iov;
len = (int)recvmsg(socketDesc, &msgh, MSG_DONTWAIT); msgh.msg_iovlen = 1;
if (len < 0) { msgh.msg_flags = 0;
ERROR_IF(errno != EAGAIN, "recvmsg()");
return -1; if (isActive && socketDesc && BufferAddr && (BufferLen > 0))
} len = (int)recvmsg(socketDesc, &msgh, MSG_DONTWAIT);
else if (len > 0) { else
// Process auxiliary received data and validate source address break;
for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(&msgh, cmsg)) { if (len > 0) {
if ((cmsg->cmsg_level == SOL_IP) && (cmsg->cmsg_type == IP_PKTINFO)) { // Process auxiliary received data and validate source address
struct in_pktinfo *i = (struct in_pktinfo *)CMSG_DATA(cmsg); for (cmsg = CMSG_FIRSTHDR(&msgh); cmsg != NULL; cmsg = CMSG_NXTHDR(&msgh, cmsg)) {
if ((i->ipi_addr.s_addr == streamAddr) || (INADDR_ANY == streamAddr)) { if ((cmsg->cmsg_level == SOL_IP) && (cmsg->cmsg_type == IP_PKTINFO)) {
if (BufferAddr[0] == TS_SYNC_BYTE) struct in_pktinfo *i = (struct in_pktinfo *)CMSG_DATA(cmsg);
return len; if ((i->ipi_addr.s_addr == streamAddr) || (INADDR_ANY == streamAddr)) {
else if (len > 3) { if (BufferAddr[0] == TS_SYNC_BYTE)
// http://www.networksorcery.com/enp/rfc/rfc2250.txt return len;
// version else if (len > 3) {
unsigned int v = (BufferAddr[0] >> 6) & 0x03; // http://www.networksorcery.com/enp/rfc/rfc2250.txt
// extension bit // version
unsigned int x = (BufferAddr[0] >> 4) & 0x01; unsigned int v = (BufferAddr[0] >> 6) & 0x03;
// cscr count // extension bit
unsigned int cc = BufferAddr[0] & 0x0F; unsigned int x = (BufferAddr[0] >> 4) & 0x01;
// payload type: MPEG2 TS = 33 // cscr count
//unsigned int pt = readBuffer[1] & 0x7F; unsigned int cc = BufferAddr[0] & 0x0F;
// header lenght // payload type: MPEG2 TS = 33
unsigned int headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t); //unsigned int pt = readBuffer[1] & 0x7F;
// check if extension // header lenght
if (x) { unsigned int headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t);
// extension header length // check if extension
unsigned int ehl = (((BufferAddr[headerlen + 2] & 0xFF) << 8) | if (x) {
(BufferAddr[headerlen + 3] & 0xFF)); // extension header length
// update header length unsigned int ehl = (((BufferAddr[headerlen + 2] & 0xFF) << 8) |
headerlen += (ehl + 1) * (unsigned int)sizeof(uint32_t); (BufferAddr[headerlen + 3] & 0xFF));
} // update header length
// Check that rtp is version 2 and payload contains multiple of TS packet data headerlen += (ehl + 1) * (unsigned int)sizeof(uint32_t);
if ((v == 2) && (((len - headerlen) % TS_SIZE) == 0) && }
(BufferAddr[headerlen] == TS_SYNC_BYTE)) { // Check that rtp is version 2 and payload contains multiple of TS packet data
// Set argument point to payload in read buffer if ((v == 2) && (((len - headerlen) % TS_SIZE) == 0) &&
memmove(BufferAddr, &BufferAddr[headerlen], (len - headerlen)); (BufferAddr[headerlen] == TS_SYNC_BYTE)) {
return (len - headerlen); // Set argument point to payload in read buffer
} memmove(BufferAddr, &BufferAddr[headerlen], (len - headerlen));
} return (len - headerlen);
} }
} }
} }
} }
}
}
} while (len > 0);
ERROR_IF_RET(len < 0 && errno != EAGAIN, "recvmsg()", return -1);
return 0; return 0;
} }