#include <stdint.h>#include "avformat.h"#include "rtpdec.h"Go to the source code of this file.
Typedefs | |
| typedef struct RDTDemuxContext | RDTDemuxContext |
Functions | |
| RDTDemuxContext * | ff_rdt_parse_open (AVFormatContext *ic, int first_stream_of_set_idx, void *priv_data, RTPDynamicProtocolHandler *handler) |
| Allocate and init the RDT parsing context. | |
| void | ff_rdt_parse_close (RDTDemuxContext *s) |
| void | ff_rdt_calc_response_and_checksum (char response[41], char chksum[9], const char *challenge) |
| Calculate the response (RealChallenge2 in the RTSP header) to the challenge (RealChallenge1 in the RTSP header from the Real/Helix server), which is used as some sort of client validation. | |
| void | av_register_rdt_dynamic_payload_handlers (void) |
| Register RDT-related dynamic payload handlers with our cache. | |
| void | ff_rdt_subscribe_rule (char *cmd, int size, int stream_nr, int rule_nr) |
| Add subscription information to Subscribe parameter string. | |
| int | ff_rdt_parse_header (const uint8_t *buf, int len, int *set_id, int *seq_no, int *stream_id, int *is_keyframe, uint32_t *timestamp) |
| Parse RDT-style packet header. | |
| int | ff_rdt_parse_packet (RDTDemuxContext *s, AVPacket *pkt, const uint8_t *buf, int len) |
| Parse RDT-style packet data (header + media data). | |
| void | ff_real_parse_sdp_a_line (AVFormatContext *s, int stream_index, const char *buf) |
| Parse a server-related SDP line. | |
| typedef struct RDTDemuxContext RDTDemuxContext |
| void av_register_rdt_dynamic_payload_handlers | ( | void | ) |
Register RDT-related dynamic payload handlers with our cache.
Definition at line 554 of file rdt.c.
Referenced by av_register_all().
| void ff_rdt_calc_response_and_checksum | ( | char | response[41], | |
| char | chksum[9], | |||
| const char * | challenge | |||
| ) |
Calculate the response (RealChallenge2 in the RTSP header) to the challenge (RealChallenge1 in the RTSP header from the Real/Helix server), which is used as some sort of client validation.
| response | pointer to response buffer, it should be at least 41 bytes (40 data + 1 zero) bytes long. | |
| chksum | pointer to buffer containing a checksum of the response, it should be at least 9 (8 data + 1 zero) bytes long. | |
| challenge | pointer to the RealChallenge1 value provided by the server. |
| void ff_rdt_parse_close | ( | RDTDemuxContext * | s | ) |
| int ff_rdt_parse_header | ( | const uint8_t * | buf, | |
| int | len, | |||
| int * | pset_id, | |||
| int * | pseq_no, | |||
| int * | pstream_id, | |||
| int * | pis_keyframe, | |||
| uint32_t * | ptimestamp | |||
| ) |
Parse RDT-style packet header.
| buf | input buffer | |
| len | length of input buffer | |
| set_id | will be set to the set ID this packet belongs to | |
| seq_no | will be set to the sequence number of the packet | |
| stream_id | will be set to the stream ID this packet belongs to | |
| is_keyframe | will be whether this packet belongs to a keyframe | |
| timestamp | will be set to the timestamp of the packet |
return 0 on packet, no more left, 1 on packet, 1 on partial packet...
Layout of the header (in bits): 1: len_included Flag indicating whether this header includes a length field; this can be used to concatenate multiple RDT packets in a single UDP/TCP data frame and is used to precede RDT data by stream status packets 1: need_reliable Flag indicating whether this header includes a "reliable sequence number"; these are apparently sequence numbers of data packets alone. For data packets, this flag is always set, according to the Real documentation [1] 5: set_id ID of a set of streams of identical content, possibly with different codecs or bitrates 1: is_reliable Flag set for certain streams deemed less tolerable for packet loss 16: seq_no Packet sequence number; if >=0xFF00, this is a non-data packet containing stream status info, the second byte indicates the type of status packet (see wireshark docs / source code [2]) if (len_included) { 16: packet_len } else { packet_len = remainder of UDP/TCP frame } 1: is_back_to_back Back-to-Back flag; used for timing, set for one in every 10 packets, according to the Real documentation [1] 1: is_slow_data Slow-data flag; currently unused, according to Real docs [1] 5: stream_id ID of the stream within this particular set of streams 1: is_no_keyframe Non-keyframe flag (unset if packet belongs to a keyframe) 32: timestamp (PTS) if (set_id == 0x1F) { 16: set_id (extended set-of-streams ID; see set_id) } if (need_reliable) { 16: reliable_seq_no Reliable sequence number (see need_reliable) } if (stream_id == 0x3F) { 16: stream_id (extended stream ID; see stream_id) } [1] https://protocol.helixcommunity.org/files/2005/devdocs/RDT_Feature_Level_20.txt [2] http://www.wireshark.org/docs/dfref/r/rdt.html and http://anonsvn.wireshark.org/viewvc/trunk/epan/dissectors/packet-rdt.c
Definition at line 193 of file rdt.c.
Referenced by ff_rdt_parse_packet().
| RDTDemuxContext* ff_rdt_parse_open | ( | AVFormatContext * | ic, | |
| int | first_stream_of_set_idx, | |||
| void * | priv_data, | |||
| RTPDynamicProtocolHandler * | handler | |||
| ) |
Allocate and init the RDT parsing context.
| ic | the containing RTSP demuxer context | |
| first_stream_of_set_idx | index to the first AVStream in the RTSP demuxer context's ic->streams array that is part of this particular stream's set of streams (with identical content) | |
| priv_data | private data of the payload data handler context | |
| handler | pointer to the parse_packet() payload parsing function |
Definition at line 54 of file rdt.c.
Referenced by rtsp_open_transport_ctx().
| int ff_rdt_parse_packet | ( | RDTDemuxContext * | s, | |
| AVPacket * | pkt, | |||
| const uint8_t * | buf, | |||
| int | len | |||
| ) |
Parse RDT-style packet data (header + media data).
Usage similar to rtp_parse_packet().
< Should not be used if buf is NULL, but should be set to the timestamp of the packet returned....
| void ff_rdt_subscribe_rule | ( | char * | cmd, | |
| int | size, | |||
| int | stream_nr, | |||
| int | rule_nr | |||
| ) |
| void ff_real_parse_sdp_a_line | ( | AVFormatContext * | s, | |
| int | stream_index, | |||
| const char * | buf | |||
| ) |
Parse a server-related SDP line.
| s | the RTSP AVFormatContext | |
| stream_index | the index of the first stream in the set represented by the SDP m= line (in s->streams) | |
| buf | the SDP line |
Definition at line 503 of file rdt.c.
Referenced by sdp_parse_line().
1.5.8