sdp.h File Reference

RFC 4566-compliant SDP implementation. More...

#include <smolrtsp/priv/compiler_attrs.h>
#include <smolrtsp/writer.h>
#include <slice99.h>

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Data Structures
struct	SmolRTSP_SdpLine
	An SDP line. More...

Macros
#define	SMOLRTSP_SDP_DESCRIBE(ret, w, ...)    SMOLRTSP_PRIV_SDP_DESCRIBE(ret, w, __VA_ARGS__)
	Writes a sequence of SDP lines to w. More...
#define	SMOLRTSP_SDP_VERSION   'v'
	Protocol Version (v=).
#define	SMOLRTSP_SDP_ORIGIN   'o'
	Origin (o=).
#define	SMOLRTSP_SDP_SESSION_NAME   's'
	Session Name (s=).
#define	SMOLRTSP_SDP_INFO   'i'
	Session Information (i=).
#define	SMOLRTSP_SDP_URI   'u'
	URI (u=).
#define	SMOLRTSP_SDP_EMAIL   'e'
	Email Address (e=).
#define	SMOLRTSP_SDP_PHONE   'p'
	Phone Number (p=).
#define	SMOLRTSP_SDP_CONNECTION   'c'
	Connection Data (c=).
#define	SMOLRTSP_SDP_BANDWIDTH   'b'
	Bandwidth (b=).
#define	SMOLRTSP_SDP_TIME   't'
	Timing (t=).
#define	SMOLRTSP_SDP_REPEAT   'r'
	Repeat Times (r=).
#define	SMOLRTSP_SDP_TIME_ZONES   'z'
	Time Zones (z=).
#define	SMOLRTSP_SDP_ENCRYPTION_KEYS   'k'
	Encryption Keys (k=).
#define	SMOLRTSP_SDP_ATTR   'a'
	Attributes (a=).
#define	SMOLRTSP_SDP_MEDIA   'm'
	Media Descriptions (m=).

Typedefs
typedef char	SmolRTSP_SdpType
	An SDP type (one character).

Functions
ssize_t	SmolRTSP_SdpLine_serialize (const SmolRTSP_SdpLine *restrict self, SmolRTSP_Writer w) SMOLRTSP_PRIV_MUST_USE
	Serialises self into w. More...
ssize_t	smolrtsp_sdp_printf (SmolRTSP_Writer w, SmolRTSP_SdpType ty, const char *restrict fmt,...) SMOLRTSP_PRIV_MUST_USE SMOLRTSP_PRIV_GCC_ATTR(format(printf
	Printfs a single SDP line to w. More...

Detailed Description

RFC 4566-compliant SDP implementation.

Macro Definition Documentation

SMOLRTSP_SDP_DESCRIBE

#define SMOLRTSP_SDP_DESCRIBE	(		ret,
			w,
			...
	)		SMOLRTSP_PRIV_SDP_DESCRIBE(ret, w, __VA_ARGS__)

Writes a sequence of SDP lines to w.

Parameters

[out]	ret	The variable name of type ssize_t that will be incremented with a number of bytes written to w.
[out]	w	The variable name of type SmolRTSP_Writer to be provided with SDP data.

The rest of arguments represent a non-empty sequence of comma-separated tuples (ty, fmt, ...), where

• ty is an SDP line type (such as SMOLRTSP_SDP_VERSION),
• fmt is a printf-like format string,
• and ... are the fmt parameters (may be omitted).

Under the hood, SMOLRTSP_SDP_DESCRIBE just generates a smolrtsp_sdp_printf function invocation for each variadic argument.

Examples

char buffer[256] = {0};
const SmolRTSP_Writer sdp = smolrtsp_string_writer(buffer);
ssize_t ret = 0;
 
SMOLRTSP_SDP_DESCRIBE(
    ret, sdp,
    (SMOLRTSP_SDP_VERSION, "0"),
    (SMOLRTSP_SDP_ORIGIN, "SmolRTSP 3855320066 3855320129 IN IP4 0.0.0.0"),
    (SMOLRTSP_SDP_SESSION_NAME, "SmolRTSP test"),
    (SMOLRTSP_SDP_CONNECTION, "IN IP4 %s", SERVER_IP_ADDR),
    (SMOLRTSP_SDP_TIME, "0 0"),
    (SMOLRTSP_SDP_MEDIA, "audio %d RTP/AVP %d", AUDIO_PORT,
AUDIO_RTP_PAYLOAD_TYPE),
    (SMOLRTSP_SDP_ATTR, "control:audio"));
 
const char *expected =
    "v=0\r\n"
    "o=SmolRTSP 3855320066 3855320129 IN IP4 0.0.0.0\r\n"
    "s=SmolRTSP test\r\n"
    "c=IN IP4 0.0.0.0\r\n"
    "t=0 0\r\n"
    "m=audio 123 RTP/AVP 456\r\n"
    "a=control:audio\r\n";
 
assert((ssize_t)strlen(expected) == ret);
assert(strcmp(expected, buffer) == 0);

Function Documentation

smolrtsp_sdp_printf()

ssize_t smolrtsp_sdp_printf	(	SmolRTSP_Writer	w,
		SmolRTSP_SdpType	ty,
		const char *restrict	fmt,
			...
	)

Printfs a single SDP line to w.

Parameters

[out]	w	The writer to be provided with SDP data.
[in]	ty	The type of the SDP line.
[in]	fmt	The printf-like format string.

Returns

The number of bytes written or a negative value on error.

Precondition

w.self && w.vptr

fmt != NULL

SmolRTSP_SdpLine_serialize()

ssize_t SmolRTSP_SdpLine_serialize	(	const SmolRTSP_SdpLine *restrict	self,
		SmolRTSP_Writer	w
	)

Serialises self into w.

Parameters

[in]	self	The instance to be serialised.
[in]	w	The writer to be provided with serialised data.

Returns

The number of bytes written or a negative value on error.

Precondition

self != NULL

w.self && w.vptr