diff options
| -rw-r--r-- | src/AVTInput.cpp | 24 |
1 files changed, 22 insertions, 2 deletions
diff --git a/src/AVTInput.cpp b/src/AVTInput.cpp index d39f2ef..2498e19 100644 --- a/src/AVTInput.cpp +++ b/src/AVTInput.cpp @@ -208,19 +208,39 @@ const uint8_t* AVTInput::_findDABFrameFromUDP(const uint8_t* buf, size_t size, bool rtp = false; // RTP Header is optionnal, STI is mandatory - if (error) - { + if (error) { // Assuming RTP header if (size-index >= 12) { uint32_t version = (buf[index] & 0xC0) >> 6; uint32_t payloadType = (buf[index+1] & 0x7F); if (version == 2 && payloadType == 34) { +#if 0 + // If one wants to decode the RTP timestamp, here is some + // example code. The AVT generates a timestamp which starts + // at device startup, and is not useful for timing. Proper + // frame ordering is guaranteed with the DFCT below. + const uint32_t timestamp = + (buf[index+4] << 24) | + (buf[index+5] << 16) | + (buf[index+6] << 8) | + buf[index+7]; + + using namespace std::chrono; + const auto now = steady_clock::now().time_since_epoch(); + + const auto t1 = timestamp / 90 / 24; + const auto t2 = duration_cast<milliseconds>(now).count() / 24; + + fprintf(stderr, "RTP TS=%d vs %lld delta %lld\n", t1, t2, t2-t1); +#endif + index += 12; // RTP Header length error = !_isSTI(buf+index); rtp = true; } } } + if (!error) { index += 4; //uint32_t DFS = unpack2(buf+index); |