FFmpeg: libavformat/rtp.c File Reference

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libavformat

Functions | Variables

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.

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.

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.

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.

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.

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().

struct { ... } 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().

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