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vdr-plugin-satip/rtp.c

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/*
* rtp.c: SAT>IP plugin for the Video Disk Recorder
*
* See the README file for copyright information and how to reach the author.
*
*/
#define __STDC_FORMAT_MACROS // Required for format specifiers
#include <inttypes.h>
#include "config.h"
#include "common.h"
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#include "log.h"
#include "rtp.h"
cSatipRtp::cSatipRtp(cSatipTunerIf &tunerP)
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: tunerM(tunerP),
bufferLenM(eRtpPacketReadCount * eMaxUdpPacketSizeB),
bufferM(MALLOC(unsigned char, bufferLenM)),
lastErrorReportM(0),
packetErrorsM(0),
sequenceNumberM(-1)
{
debug1("%s () [device %d]", __PRETTY_FUNCTION__, tunerM.GetId());
if (!bufferM)
error("Cannot create RTP buffer! [device %d]", tunerM.GetId());
}
cSatipRtp::~cSatipRtp()
{
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debug1("%s [device %d]", __PRETTY_FUNCTION__, tunerM.GetId());
DELETE_POINTER(bufferM);
}
int cSatipRtp::GetFd(void)
{
return Fd();
}
void cSatipRtp::Close(void)
{
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debug1("%s [device %d]", __PRETTY_FUNCTION__, tunerM.GetId());
cSatipSocket::Close();
sequenceNumberM = -1;
if (packetErrorsM) {
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info("Detected %d RTP packet errors [device %d]", packetErrorsM, tunerM.GetId());
packetErrorsM = 0;
lastErrorReportM = time(NULL);
}
}
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int cSatipRtp::GetHeaderLength(unsigned char *bufferP, unsigned int lengthP)
{
debug16("%s (, %d) [device %d]", __PRETTY_FUNCTION__, lengthP, tunerM.GetId());
unsigned int headerlen = 0;
if (lengthP > 0) {
if (bufferP[0] == TS_SYNC_BYTE)
return headerlen;
else if (lengthP > 3) {
// http://tools.ietf.org/html/rfc3550
// http://tools.ietf.org/html/rfc2250
// Version
unsigned int v = (bufferP[0] >> 6) & 0x03;
// Extension bit
unsigned int x = (bufferP[0] >> 4) & 0x01;
// CSCR count
unsigned int cc = bufferP[0] & 0x0F;
// Payload type: MPEG2 TS = 33
unsigned int pt = bufferP[1] & 0x7F;
if (pt != 33)
debug7("%s (%d) Received invalid RTP payload type %d - v=%d [device %d]",
__PRETTY_FUNCTION__, lengthP, pt, v, tunerM.GetId());
// Sequence number
int seq = ((bufferP[2] & 0xFF) << 8) | (bufferP[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) {
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info("Detected %d RTP packet errors [device %d]", packetErrorsM, tunerM.GetId());
packetErrorsM = 0;
lastErrorReportM = time(NULL);
}
sequenceNumberM = seq;
}
else
sequenceNumberM = seq;
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// Header length
headerlen = (3 + cc) * (unsigned int)sizeof(uint32_t);
// Check if extension
if (x) {
// Extension header length
unsigned int ehl = (((bufferP[headerlen + 2] & 0xFF) << 8) | (bufferP[headerlen + 3] & 0xFF));
// Update header length
headerlen += (ehl + 1) * (unsigned int)sizeof(uint32_t);
}
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// Check for empty payload
if (lengthP == headerlen) {
debug7("%s (%d) Received empty RTP packet #%d [device %d]", __PRETTY_FUNCTION__, lengthP, seq, tunerM.GetId());
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headerlen = -1;
}
// Check that rtp is version 2 and payload contains multiple of TS packet data
else if ((v != 2) || (((lengthP - headerlen) % TS_SIZE) != 0) || (bufferP[headerlen] != TS_SYNC_BYTE)) {
debug7("%s (%d) Received incorrect RTP packet #%d v=%d len=%d sync=0x%02X [device %d]", __PRETTY_FUNCTION__,
lengthP, seq, v, headerlen, bufferP[headerlen], tunerM.GetId());
headerlen = -1;
}
else
debug7("%s (%d) Received RTP packet #%d v=%d len=%d sync=0x%02X [device %d]", __PRETTY_FUNCTION__,
lengthP, seq, v, headerlen, bufferP[headerlen], tunerM.GetId());
}
}
return headerlen;
}
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void cSatipRtp::Process(void)
{
debug16("%s [device %d]", __PRETTY_FUNCTION__, tunerM.GetId());
if (bufferM) {
unsigned int lenMsg[eRtpPacketReadCount];
uint64_t elapsed;
int count = 0;
cTimeMs processing(0);
do {
count = ReadMulti(bufferM, lenMsg, eRtpPacketReadCount, eMaxUdpPacketSizeB);
for (int i = 0; i < count; ++i) {
unsigned char *p = &bufferM[i * eMaxUdpPacketSizeB];
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int headerlen = GetHeaderLength(p, lenMsg[i]);
if ((headerlen >= 0) && (headerlen < (int)lenMsg[i]))
tunerM.ProcessVideoData(p + headerlen, lenMsg[i] - headerlen);
}
} while (count >= eRtpPacketReadCount);
if (errno != EAGAIN && errno != EWOULDBLOCK)
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error("Error %d reading in %s [device %d]", errno, *ToString(), tunerM.GetId());
elapsed = processing.Elapsed();
if (elapsed > 1)
debug6("%s %d read(s) took %" PRIu64 " ms [device %d]", __PRETTY_FUNCTION__, count, elapsed, tunerM.GetId());
}
}
cString cSatipRtp::ToString(void) const
{
return cString::sprintf("RTP [device %d]", tunerM.GetId());
}