- Generated by
1.9.8
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Compy 0.2.0
A lightweight RTSP 1.0 server library for embedded systems
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An RTP header. More...
#include <rtp.h>
Data Fields | |
| uint8_t | version |
| (2 bits) Indicates the version of the protocol. | |
| bool | padding |
| (1 bit) Used to indicate if there are extra padding bytes at the end of the RTP packet. | |
| bool | extension |
| (1 bit) Indicates presence of an extension header between the header and payload data. | |
| uint8_t | csrc_count |
| (4 bits) Contains the number of CSRC identifiers (defined below) that follow the SSRC (also defined below). | |
| bool | marker |
| (1 bit) Signaling used at the application level in a profile-specific manner. | |
| uint8_t | payload_ty |
| (7 bits) Indicates the format of the payload and thus determines its interpretation by the application. | |
| uint16_t | sequence_number |
| (16 bits) The sequence number is incremented for each RTP data packet sent and is to be used by the receiver to detect packet loss[1] and to accommodate out-of-order delivery. | |
| uint32_t | timestamp |
| Used by the receiver to play back the received samples at appropriate time and interval. | |
| uint32_t | ssrc |
| (32 bits) Synchronization source identifier uniquely identifies the source of a stream. | |
| uint32_t * | csrc |
| (32 bits each, the number of entries is indicated by the CSRC count field) Contributing source IDs enumerate contributing sources to a stream which has been generated from multiple sources. | |
| uint16_t | extension_profile |
| (optional, presence indicated by Extension field) The first 32-bit word contains a profile-specific identifier (16 bits) and a length specifier (16 bits) that indicates the length of the extension in 32-bit units, excluding the 32 bits of the extension header. | |
| uint16_t | extension_payload_len |
| Length of the extension in 32-bit units (host byte order). | |
| uint8_t * | extension_payload |
| The pointer to extension header data. | |
An RTP header.
Multi-byte fields (sequence_number, timestamp, ssrc, extension_profile) are converted to network byte order by the serializer. Exception: extension_payload_len is in host byte order (number of 32-bit words) and converted to network byte order during serialization.
| bool Compy_RtpHeader::extension |
(1 bit) Indicates presence of an extension header between the header and payload data.
The extension header is application or profile specific.
| uint16_t Compy_RtpHeader::extension_payload_len |
Length of the extension in 32-bit units (host byte order).
The serializer converts to network byte order on the wire.
| uint16_t Compy_RtpHeader::extension_profile |
(optional, presence indicated by Extension field) The first 32-bit word contains a profile-specific identifier (16 bits) and a length specifier (16 bits) that indicates the length of the extension in 32-bit units, excluding the 32 bits of the extension header.
The extension header data follows.
| bool Compy_RtpHeader::marker |
(1 bit) Signaling used at the application level in a profile-specific manner.
If it is set, it means that the current data has some special relevance for the application.
| bool Compy_RtpHeader::padding |
(1 bit) Used to indicate if there are extra padding bytes at the end of the RTP packet.
Padding may be used to fill up a block of certain size, for example as required by an encryption algorithm. The last byte of the padding contains the number of padding bytes that were added (including itself).
| uint8_t Compy_RtpHeader::payload_ty |
(7 bits) Indicates the format of the payload and thus determines its interpretation by the application.
Values are profile specific and may be dynamically assigned.
| uint16_t Compy_RtpHeader::sequence_number |
(16 bits) The sequence number is incremented for each RTP data packet sent and is to be used by the receiver to detect packet loss[1] and to accommodate out-of-order delivery.
The initial value of the sequence number should be randomized to make known-plaintext attacks on Secure Real-time Transport Protocol more difficult.
| uint32_t Compy_RtpHeader::ssrc |
(32 bits) Synchronization source identifier uniquely identifies the source of a stream.
The synchronization sources within the same RTP session will be unique.
| uint32_t Compy_RtpHeader::timestamp |
Used by the receiver to play back the received samples at appropriate time and interval.
When several media streams are present, the timestamps may be independent in each stream.[b] The granularity of the timing is application specific. For example, an audio application that samples data once every 125 μs (8 kHz, a common sample rate in digital telephony) would use that value as its clock resolution. Video streams typically use a 90 kHz clock. The clock granularity is one of the details that is specified in the RTP profile for an application.
| uint8_t Compy_RtpHeader::version |
(2 bits) Indicates the version of the protocol.
Current version is 2.
1.9.8