rtp.h File Reference
Definition of structures and functions to handle RTP headers. For a description of RTP see RFC1889 on http://www.ietf.org. More...
#include "nalu.h"
Go to the source code of this file.
Data Structures | |
| struct | RTPpacket_t |
Defines | |
| #define | MAXRTPPAYLOADLEN (65536 - 40) |
| #define | MAXRTPPACKETSIZE (65536 - 28) |
| #define | H264PAYLOADTYPE 105 |
| #define | H264SSRC 0x12345678 |
| #define | RTP_TR_TIMESTAMP_MULT 1000 |
Functions | |
| void | RTPUpdateTimestamp (int tr) |
| void | OpenRTPFile (char *Filename) |
| void | CloseRTPFile (void) |
| int | WriteRTPNALU (NALU_t *n) |
Detailed Description
Definition of structures and functions to handle RTP headers. For a description of RTP see RFC1889 on http://www.ietf.org.
- Date:
- 30 September 2001
Definition in file rtp.h.
Define Documentation
| #define H264PAYLOADTYPE 105 |
RTP paylaod type fixed here for simplicity.
Definition at line 25 of file rtp.h.
Referenced by WriteRTPNALU().
| #define H264SSRC 0x12345678 |
SSRC, chosen to simplify debugging.
Definition at line 26 of file rtp.h.
Referenced by WriteRTPNALU().
| #define MAXRTPPACKETSIZE (65536 - 28) |
Maximum size of an RTP packet incl. header.
Definition at line 24 of file rtp.h.
Referenced by WriteRTPNALU().
| #define MAXRTPPAYLOADLEN (65536 - 40) |
Maximum payload size of an RTP packet.
Definition at line 23 of file rtp.h.
Referenced by clear_sei_message(), ClearSubseqInfoPayload(), FinalizeSpareMBMap(), InitSparePicture(), and InitSubseqInfo().
| #define RTP_TR_TIMESTAMP_MULT 1000 |
should be something like 27 Mhz / 29.97 Hz
Definition at line 27 of file rtp.h.
Referenced by RTPUpdateTimestamp().
Function Documentation
| void CloseRTPFile | ( | void | ) |
Closes the output file for the RTP packet stream.
- Returns:
- none. Function terminates the program in case of an error
Definition at line 324 of file rtp.c.
References f.
Referenced by terminate_sequence().
| void OpenRTPFile | ( | char * | Filename | ) |
Opens the output file for the RTP packet stream.
- Parameters:
-
Filename The filename of the file to be opened
- Returns:
- none. Function terminates the program in case of an error
Definition at line 303 of file rtp.c.
References f.
Referenced by start_sequence().
| void RTPUpdateTimestamp | ( | int | tr | ) |
RTPUpdateTimestamp: patches the RTP timestamp depending on the TR.
- Parameters:
-
tr,: TRof the following NALUs
- Returns:
- none.
This is a violation of the security req. of RTP (random timestamp), but easier to debug
The following code assumes a wrap around of TR at 256, and needs to be changed as soon as this is no more true.
The support for B frames is a bit tricky, because it is not easy to distinguish between a natural wrap-around of the tr, and the intentional going back of the tr because of a B frame. It is solved here by a heuristic means: It is assumed that B frames are never "older" than 10 tr ticks. Everything higher than 10 is considered a wrap around.
Definition at line 256 of file rtp.c.
References RTP_TR_TIMESTAMP_MULT.
Referenced by start_slice().
| int WriteRTPNALU | ( | NALU_t * | n | ) |
int RTPWriteNALU write a NALU to the RTP file
- Returns:
- Number of bytes written to output file
- Side effects
- Packet written, RTPSequenceNumber and RTPTimestamp updated
- Date:
- December 13, 2002
For error resilience work, we need the correct marker bit. Introduce a nalu->marker and set it in terminate_slice()?
Definition at line 181 of file rtp.c.
References NALU_t::buf, ComposeRTPPacket(), CurrentRTPSequenceNumber, f, NALU_t::forbidden_bit, H264PAYLOADTYPE, H264SSRC, NALU_t::len, MAXRTPPACKETSIZE, NALU_t::nal_reference_idc, NALU_t::nal_unit_type, no_mem_exit(), NALU_t::startcodeprefix_len, and WriteRTPPacket().
Referenced by start_sequence().
