Realmedia RTSP protocol (RDT) support. More...

#include "avformat.h"
#include "libavutil/avstring.h"
#include "rtpdec.h"
#include "rdt.h"
#include "libavutil/base64.h"
#include "libavutil/md5.h"
#include "rm.h"
#include "internal.h"
#include "avio_internal.h"
#include "libavcodec/get_bits.h"

Data Structures
struct	RDTDemuxContext

struct	PayloadContext
	RTP/JPEG specific private data. More...

Macros
#define	XOR_TABLE_SIZE 37

#define	RDT_HANDLER(n, s, t)

Functions
RDTDemuxContext *	ff_rdt_parse_open (AVFormatContext ic, int first_stream_of_set_idx, void priv_data, const RTPDynamicProtocolHandler *handler)
	Allocate and init the RDT parsing context. More...

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. More...

static int	rdt_load_mdpr (PayloadContext rdt, AVStream st, int rule_nr)

static int	rdt_parse_packet (AVFormatContext ctx, PayloadContext rdt, AVStream st, AVPacket pkt, uint32_t timestamp, const uint8_t buf, int len, uint16_t rtp_seq, int flags)

int	ff_rdt_parse_packet (RDTDemuxContext s, AVPacket pkt, uint8_t **bufptr, int len)
	Parse RDT-style packet data (header + media data). More...

void	ff_rdt_subscribe_rule (char *cmd, int size, int stream_nr, int rule_nr)
	Add subscription information to Subscribe parameter string. More...

static unsigned char *	rdt_parse_b64buf (unsigned int target_len, const char p)

static int	rdt_parse_sdp_line (AVFormatContext s, int st_index, PayloadContext rdt, const char *line)

static void	real_parse_asm_rule (AVStream st, const char p, const char *end)

static AVStream *	add_dstream (AVFormatContext s, AVStream orig_st)

static void	real_parse_asm_rulebook (AVFormatContext s, AVStream orig_st, const char *p)

void	ff_real_parse_sdp_a_line (AVFormatContext s, int stream_index, const char line)
	Parse a server-related SDP line. More...

static av_cold int	rdt_init (AVFormatContext s, int st_index, PayloadContext rdt)

static void	rdt_close_context (PayloadContext *rdt)

	RDT_HANDLER (live_video, "x-pn-multirate-realvideo-live", AVMEDIA_TYPE_VIDEO)

	RDT_HANDLER (live_audio, "x-pn-multirate-realaudio-live", AVMEDIA_TYPE_AUDIO)

	RDT_HANDLER (video, "x-pn-realvideo", AVMEDIA_TYPE_VIDEO)

	RDT_HANDLER (audio, "x-pn-realaudio", AVMEDIA_TYPE_AUDIO)

Detailed Description

Realmedia RTSP protocol (RDT) support.

Author: Ronald S. Bultje rbult.nosp@m.je@r.nosp@m.onald.nosp@m..bit.nosp@m.freak.nosp@m..net

Definition in file rdt.c.

Macro Definition Documentation

◆ XOR_TABLE_SIZE

#define XOR_TABLE_SIZE 37

◆ RDT_HANDLER

#define RDT_HANDLER	(	n,
		s,
		t
	)

Value:

const RTPDynamicProtocolHandler ff_rdt_ ## n ## _handler = { \
    .enc_name         = s, \
    .codec_type       = t, \
    .codec_id         = AV_CODEC_ID_NONE, \
    .priv_data_size   = sizeof(PayloadContext), \
    .init             = rdt_init, \
    .parse_sdp_a_line = rdt_parse_sdp_line, \
    .close            = rdt_close_context, \
    .parse_packet     = rdt_parse_packet \
}

Definition at line 557 of file rdt.c.

Function Documentation

◆ ff_rdt_parse_open()

RDTDemuxContext* ff_rdt_parse_open	(	AVFormatContext *	ic,
		int	first_stream_of_set_idx,
		void *	priv_data,
		const RTPDynamicProtocolHandler *	handler
	)

Allocate and init the RDT parsing context.

Parameters

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

Returns: a newly allocated RDTDemuxContext. Free with ff_rdt_parse_close().

Definition at line 55 of file rdt.c.

Referenced by ff_rtsp_open_transport_ctx().

◆ ff_rdt_parse_close()

void ff_rdt_parse_close ( RDTDemuxContext * s )

Definition at line 78 of file rdt.c.

Referenced by ff_rtsp_undo_setup(), and rtsp_read_setup().

◆ ff_rdt_calc_response_and_checksum()

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.

Parameters

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.

Definition at line 94 of file rdt.c.

◆ rdt_load_mdpr()

static int rdt_load_mdpr	(	PayloadContext *	rdt,
		AVStream *	st,
		int	rule_nr
	)

static

Layout of the MLTI chunk: 4: MLTI 2: number of streams Then for each stream ([number_of_streams] times): 2: mdpr index 2: number of mdpr chunks Then for each mdpr chunk ([number_of_mdpr_chunks] times): 4: size

we skip MDPR chunks until we reach the one of the stream we're interested in, and forward that ([size]+[data]) to the RM demuxer to parse the stream-specific header data.

Definition at line 132 of file rdt.c.

Referenced by rdt_parse_sdp_line().

◆ rdt_parse_packet()

static int rdt_parse_packet	(	AVFormatContext *	ctx,
		PayloadContext *	rdt,
		AVStream *	st,
		AVPacket *	pkt,
		uint32_t *	timestamp,
		const uint8_t *	buf,
		int	len,
		uint16_t	rtp_seq,
		int	flags
	)

static

Definition at line 295 of file rdt.c.

◆ ff_rdt_parse_packet()

int ff_rdt_parse_packet	(	RDTDemuxContext *	s,
		AVPacket *	pkt,
		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....

Definition at line 336 of file rdt.c.

◆ ff_rdt_subscribe_rule()

void ff_rdt_subscribe_rule	(	char *	cmd,
		int	size,
		int	stream_nr,
		int	rule_nr
	)

Add subscription information to Subscribe parameter string.

Parameters

cmd	string to write the subscription information into.
size	size of cmd.
stream_nr	stream number.
rule_nr	rule number to conform to.

Definition at line 385 of file rdt.c.

Referenced by rtsp_read_packet().

◆ rdt_parse_b64buf()

static unsigned char* rdt_parse_b64buf	(	unsigned int *	target_len,
		const char *	p
	)

static

Definition at line 393 of file rdt.c.

Referenced by rdt_parse_sdp_line().

◆ rdt_parse_sdp_line()

static int rdt_parse_sdp_line	(	AVFormatContext *	s,
		int	st_index,
		PayloadContext *	rdt,
		const char *	line
	)

static

Definition at line 410 of file rdt.c.

◆ real_parse_asm_rule()

static void real_parse_asm_rule	(	AVStream *	st,
		const char *	p,
		const char *	end
	)

static

Definition at line 448 of file rdt.c.

Referenced by real_parse_asm_rulebook().

◆ add_dstream()

static AVStream* add_dstream	(	AVFormatContext *	s,
		AVStream *	orig_st
	)

static

Definition at line 461 of file rdt.c.

Referenced by real_parse_asm_rulebook().

◆ real_parse_asm_rulebook()

static void real_parse_asm_rulebook	(	AVFormatContext *	s,
		AVStream *	orig_st,
		const char *	p
	)

static

The ASMRuleBook contains a list of comma-separated strings per rule, and each rule is separated by a ;. The last one also has a ; at the end so we can use it as delimiter. Every rule occurs twice, once for when the RTSP packet header marker is set and once for if it isn't. We only read the first because we don't care much (that's what the "odd" variable is for). Each rule contains a set of one or more statements, optionally preceded by a single condition. If there's a condition, the rule starts with a '#'. Multiple conditions are merged between brackets, so there are never multiple conditions spread out over separate statements. Generally, these conditions are bitrate limits (min/max) for multi-bitrate streams.

Definition at line 475 of file rdt.c.

Referenced by ff_real_parse_sdp_a_line().

◆ ff_real_parse_sdp_a_line()

void ff_real_parse_sdp_a_line	(	AVFormatContext *	s,
		int	stream_index,
		const char *	buf
	)

Parse a server-related SDP line.

Parameters

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 516 of file rdt.c.

◆ rdt_init()

static av_cold int rdt_init	(	AVFormatContext *	s,
		int	st_index,
		PayloadContext *	rdt
	)

static

Definition at line 527 of file rdt.c.

◆ rdt_close_context()

static void rdt_close_context ( PayloadContext * rdt )

static

Definition at line 542 of file rdt.c.

◆ RDT_HANDLER() [1/4]

RDT_HANDLER	(	live_video	,
		"x-pn-multirate-realvideo-live"	,
		AVMEDIA_TYPE_VIDEO
	)

◆ RDT_HANDLER() [2/4]

RDT_HANDLER	(	live_audio	,
		"x-pn-multirate-realaudio-live"	,
		AVMEDIA_TYPE_AUDIO
	)

◆ RDT_HANDLER() [3/4]

RDT_HANDLER	(	video	,
		"x-pn-realvideo"	,
		AVMEDIA_TYPE_VIDEO
	)

◆ RDT_HANDLER() [4/4]

RDT_HANDLER	(	audio	,
		"x-pn-realaudio"	,
		AVMEDIA_TYPE_AUDIO
	)

Data Structures

Macros

Functions

Detailed Description

Macro Definition Documentation

◆ XOR_TABLE_SIZE

◆ RDT_HANDLER

Function Documentation

◆ ff_rdt_parse_open()

◆ ff_rdt_parse_close()

◆ ff_rdt_calc_response_and_checksum()

◆ rdt_load_mdpr()

◆ rdt_parse_packet()

◆ ff_rdt_parse_packet()

◆ ff_rdt_subscribe_rule()

◆ rdt_parse_b64buf()

◆ rdt_parse_sdp_line()

◆ real_parse_asm_rule()

◆ add_dstream()

◆ real_parse_asm_rulebook()

◆ ff_real_parse_sdp_a_line()

◆ rdt_init()

◆ rdt_close_context()

◆ RDT_HANDLER() [1/4]

◆ RDT_HANDLER() [2/4]

◆ RDT_HANDLER() [3/4]

◆ RDT_HANDLER() [4/4]