rtp.c File Reference

#include "libavutil/avstring.h"
#include "libavutil/opt.h"
#include "avformat.h"
#include "rtp.h"

Go to the source code of this file.

Functions
int	ff_rtp_get_codec_info (AVCodecContext *codec, int payload_type)
	Initialize a codec context based on the payload type. More...
int	ff_rtp_get_payload_type (AVFormatContext *fmt, AVCodecContext *codec, int idx)
	Return the payload type for a given stream used in the given format context. More...
const char *	ff_rtp_enc_name (int payload_type)
	Return the encoding name (as defined in http://www.iana.org/assignments/rtp-parameters) for a given payload type. More...
enum AVCodecID	ff_rtp_codec_id (const char *buf, enum AVMediaType codec_type)
	Return the codec id for the given encoding name and codec type. More...

Variables
struct {
int   pt
const char   enc_name [6]
enum AVMediaType   codec_type
enum AVCodecID   codec_id
int   clock_rate
int   audio_channels
}	rtp_payload_types []

Function Documentation

int ff_rtp_get_codec_info	(	AVCodecContext *	codec,
		int	payload_type
	)

Initialize a codec context based on the payload type.

Fill the codec_type and codec_id fields of a codec context with information depending on the payload type; for audio codecs, the channels and sample_rate fields are also filled.

Parameters

codec	The context of the codec
payload_type	The payload type (the 'PT' field in the RTP header)

Returns

In case of unknown payload type or dynamic payload type, a negative value is returned; otherwise, 0 is returned

Definition at line 71 of file rtp.c.

int ff_rtp_get_payload_type	(	AVFormatContext *	fmt,
		AVCodecContext *	codec,
		int	idx
	)

Return the payload type for a given stream used in the given format context.

Static payload types are derived from the codec. Dynamic payload type are derived from the id field in AVStream. The format context private option payload_type overrides both.

Parameters

fmt	The context of the format
codec	The context of the codec
idx	The stream index

Returns

The payload type (the 'PT' field in the RTP header).

Definition at line 90 of file rtp.c.

Referenced by ff_rtp_chain_mux_open(), and rtp_write_header().

const char* ff_rtp_enc_name

(

int

payload_type

)

Return the encoding name (as defined in http://www.iana.org/assignments/rtp-parameters) for a given payload type.

Parameters

payload_type

The payload type (the 'PT' field in the RTP header)

Returns

In case of unknown payload type or dynamic payload type, a pointer to an empty string is returned; otherwise, a pointer to a string containing the encoding name is returned

Definition at line 132 of file rtp.c.

enum AVCodecID ff_rtp_codec_id	(	const char *	buf,
		enum AVMediaType	codec_type
	)

Return the codec id for the given encoding name and codec type.

Parameters

buf	A pointer to the string containing the encoding name
codec_type	The codec type

Returns

In case of unknown encoding name, AV_CODEC_ID_NONE is returned; otherwise, the codec id is returned

Definition at line 143 of file rtp.c.

Variable Documentation

int pt

Definition at line 35 of file rtp.c.

Referenced by decode_entropy_coded_image(), ff_rtp_enc_name(), ff_rtp_get_codec_info(), vp5_parse_coeff(), vp5_parse_coeff_models(), vp6_decode_free_context(), vp6_parse_coeff(), vp6_parse_coeff_huffman(), and vp6_parse_coeff_models().

const char enc_name[6]

Definition at line 36 of file rtp.c.

Referenced by ff_rtp_codec_id().

enum AVMediaType codec_type

Definition at line 37 of file rtp.c.

Referenced by avcodec_string(), avi_read_header(), build_feed_streams(), create_stream(), mkv_write_packet(), and new_stream().

enum AVCodecID codec_id

Definition at line 38 of file rtp.c.

Referenced by ff_rtp_get_codec_info(), and ff_rtp_get_payload_type().

int clock_rate

Definition at line 39 of file rtp.c.

Referenced by ff_rtp_get_codec_info().

int audio_channels

Definition at line 40 of file rtp.c.

Referenced by ff_rtp_get_codec_info(), and new_audio_stream().

const { ... } rtp_payload_types[]

Initial value:

= {
  {0, "PCMU",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_MULAW, 8000, 1},
  {3, "GSM",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {4, "G723",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_G723_1, 8000, 1},
  {5, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {6, "DVI4",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 16000, 1},
  {7, "LPC",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {8, "PCMA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_ALAW, 8000, 1},
  {9, "G722",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_ADPCM_G722, 8000, 1},
  {10, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 2},
  {11, "L16",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_PCM_S16BE, 44100, 1},
  {12, "QCELP",      AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_QCELP, 8000, 1},
  {13, "CN",         AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP2, -1, -1},
  {14, "MPA",        AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_MP3, -1, -1},
  {15, "G728",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {16, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 11025, 1},
  {17, "DVI4",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 22050, 1},
  {18, "G729",       AVMEDIA_TYPE_AUDIO,   AV_CODEC_ID_NONE, 8000, 1},
  {25, "CelB",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
  {26, "JPEG",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MJPEG, 90000, -1},
  {28, "nv",         AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_NONE, 90000, -1},
  {31, "H261",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H261, 90000, -1},
  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG1VIDEO, 90000, -1},
  {32, "MPV",        AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_MPEG2VIDEO, 90000, -1},
  {33, "MP2T",       AVMEDIA_TYPE_DATA,    AV_CODEC_ID_MPEG2TS, 90000, -1},
  {34, "H263",       AVMEDIA_TYPE_VIDEO,   AV_CODEC_ID_H263, 90000, -1},
  {-1, "",           AVMEDIA_TYPE_UNKNOWN, AV_CODEC_ID_NONE, -1, -1}
}

Referenced by ff_rtp_codec_id(), ff_rtp_enc_name(), ff_rtp_get_codec_info(), and ff_rtp_get_payload_type().