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Original commit message from CVS: * gst/rtp/README: Update README with some examples. * gst/rtp/gstrtpmp4gpay.c: (gst_rtp_mp4g_pay_init), (gst_rtp_mp4g_pay_finalize), (gst_rtp_mp4g_pay_parse_audio_config), (gst_rtp_mp4g_pay_parse_video_config), (gst_rtp_mp4g_pay_new_caps), (gst_rtp_mp4g_pay_setcaps): * gst/rtp/gstrtpmp4gpay.h: Make optional RTP parameters of type STRING, as required by the application/x-rtp caps specification.
214 lines
8.8 KiB
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214 lines
8.8 KiB
Text
This directory contains some RTP payloaders/depayloaders for different payload
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types. Use one payloader/depayloder pair per payload. If several payloads can be
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payloaded/depayloaded by the same element, make different copies of it, one for
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each payload.
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The application/x-rtp mime type
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-------------------------------
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For valid RTP packets encapsulated in GstBuffers, we use the caps with
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mime type application/x-rtp.
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The following fields can or must (*) be specified in the structure:
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* media: (String) [ "audio", "video", "application", "data", "control" ]
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Defined in RFC 2327 in the SDP media announcement field.
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* payload: (int) [0, 127]
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For audio and video, these will normally be a media payload type as
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defined in the RTP Audio/Video Profile. For dynamicaly allocated
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payload types, this value will be >= 96 and the encoding-name must be
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set.
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* clock-rate: (int) [0 - MAXINT]
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the RTP clock rate
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ssrc: (uint) [0 - MAXINT]
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The ssrc value currently in use.
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clock-base: (uint) [0 - MAXINT]
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The RTP time representing time 0
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seqnum-base: (uint) [0 - MAXINT]
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The RTP sequence number representing the first rtp packet
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encoding-name: (String) ANY
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typically second part of the mime type. ex. MP4V-ES. only required if
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payload type >= 96
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encoding-params: (String) ANY
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extra encoding parameters (as in the SDP a=rtpmap: field). only required
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if different from the default of the encoding-name.
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Optional parameters as key/value pairs, media type specific. The value type
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should be of type G_TYPE_STRING.
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Example:
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"application/x-rtp",
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"media", G_TYPE_STRING, "audio", -]
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"payload", G_TYPE_INT, 96, ] - required
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"clock-rate", G_TYPE_INT, 8000, -]
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"encoding-name", G_TYPE_STRING, "AMR", -] - required since payload >= 96
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"encoding-params", G_TYPE_STRING, "1", -] - optional param for AMR
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"octet-align", G_TYPE_STRING, "1", -]
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"crc", G_TYPE_STRING, "0", ]
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"robust-sorting", G_TYPE_STRING, "0", ] AMR specific params.
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"interleaving", G_TYPE_STRING, "0", -]
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Mapping of caps to and from SDP fields:
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m=<media> <udp port> RTP/AVP <payload> -] media and payload from caps
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a=rtpmap:<payload> <encoding-name>/<clock-rate>[/<encoding-params>]
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-> when <payload> >= 96
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a=fmtp:<payload> <param>=<value>;...
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For above caps:
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m=audio <udp port> RTP/AVP 96
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a=rtpmap:96 AMR/8000/1
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a=fmtp:96 octet-align=1;crc=0;robust-sorting=0;interleaving=0
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in RTSP, the SSRC is also sent.
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The optional parameters in the SDP fields are case insensitive. In the caps we
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always use the lowercase names so that the SDP -> caps mapping remains
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possible.
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usage with UDP
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--------------
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To correctly and completely use the RTP payloaders on the sender and the
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receiver you need to write an application. It is not possible to write a full
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blown RTP server with a single gst-launch line.
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That said, it is possible to do something functional with a few gst-launch
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lines. The biggest problem when constructing a correct gst-launch line lies on
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the receiver end.
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The receiver needs to know about the type of the RTP data along with a set of
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RTP configuration parameters. This information is usually transmitted to the
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client using some sort of session description language (SDP) over some reliable
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channel (HTTP/RTSP/...).
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All of the required parameters to connect and use the RTP session on the
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server can be found in the caps on the server end. The client receives this
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information in some way (caps are converted to and from SDP, as explained above,
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for example).
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Some gst-launch lines:
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gst-launch-0.10 -v videotestsrc ! ffenc_h263p ! rtph263ppay ! udpsink
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Setting pipeline to PAUSED ...
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/pipeline0/videotestsrc0.src: caps = video/x-raw-yuv, format=(fourcc)I420,
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width=(int)320, height=(int)240, framerate=(fraction)30/1
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Pipeline is PREROLLING ...
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....
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/pipeline0/udpsink0.sink: caps = application/x-rtp, media=(string)video,
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payload=(int)96, clock-rate=(int)90000, encoding-name=(string)H263-1998,
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ssrc=(guint)527842345, clock-base=(guint)1150776941, seqnum-base=(guint)30982
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....
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Pipeline is PREROLLED ...
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Setting pipeline to PLAYING ...
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New clock: GstSystemClock
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Write down the caps on the udpsink and set them as the caps of the UDP
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receiver:
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gst-launch-0.10 -v udpsrc caps="application/x-rtp, media=(string)video,
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payload=(int)96, clock-rate=(int)90000, encoding-name=(string)H263-1998,
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ssrc=(guint)527842345, clock-base=(guint)1150776941, seqnum-base=(guint)30982"
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! rtph263pdepay ! ffdec_h263 ! xvimagesink sync=false
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The receiver now displays an h263 image. Note that the sync parameter on
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xvimagesink needs to be FALSE because we do not have an RTP session manager
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that controls the synchronisation in this pipeline.
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Stream a quicktime file with mpeg4 video and AAC audio on port 5000 and port
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5002.
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gst-launch-0.10 -v filesrc location=~/data/sincity.mp4 ! qtdemux name=d ! queue ! rtpmp4vpay ! udpsink port=5000
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d. ! queue ! rtpmp4gpay ! udpsink port=5002
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....
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/pipeline0/udpsink0.sink: caps = application/x-rtp, media=(string)video,
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payload=(int)96, clock-rate=(int)90000, encoding-name=(string)MP4V-ES,
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ssrc=(guint)1162703703, clock-base=(guint)816135835, seqnum-base=(guint)9294,
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profile-level-id=(string)3, config=(string)000001b003000001b50900000100000001200086c5d4c307d314043c1463000001b25876694430303334
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/pipeline0/udpsink1.sink: caps = application/x-rtp, media=(string)audio,
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payload=(int)96, clock-rate=(int)44100, encoding-name=(string)mpeg4-generic,
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ssrc=(guint)3246149898, clock-base=(guint)4134514058, seqnum-base=(guint)57633,
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encoding-params=(string)2, streamtype=(string)5, profile-level-id=(string)1,
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mode=(string)AAC-hbr, config=(string)1210, sizelength=(string)13,
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indexlength=(string)3, indexdeltalength=(string)3
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....
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Again copy the caps on both sinks to the receiver launch line
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gst-launch
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udpsrc port=5000 caps="application/x-rtp, media=(string)video, payload=(int)96,
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clock-rate=(int)90000, encoding-name=(string)MP4V-ES, ssrc=(guint)1162703703,
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clock-base=(guint)816135835, seqnum-base=(guint)9294, profile-level-id=(string)3,
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config=(string)000001b003000001b50900000100000001200086c5d4c307d314043c1463000001b25876694430303334"
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! rtpmp4vdepay ! ffdec_mpeg4 ! xvimagesink sync=false
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udpsrc port=5002 caps="application/x-rtp, media=(string)audio, payload=(int)96,
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clock-rate=(int)44100, encoding-name=(string)mpeg4-generic, ssrc=(guint)3246149898,
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clock-base=(guint)4134514058, seqnum-base=(guint)57633, encoding-params=(string)2,
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streamtype=(string)5, profile-level-id=(string)1, mode=(string)AAC-hbr,
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config=(string)1210, sizelength=(string)13, indexlength=(string)3,
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indexdeltalength=(string)3"
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! rtpmp4gdepay ! faad ! alsasink sync=false
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The caps on the udpsinks can be retrieved when the server pipeline prerolled to
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PAUSED.
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The caps on the receiver side can be set on the UDP source elements when the
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pipeline went to PAUSED. In that state no data is received from the UDP sources
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as they are live sources and only produce data in PLAYING.
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Relevant RFCs
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-------------
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3550 RTP: A Transport Protocol for Real-Time Applications. ( 1889 Obsolete )
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2198 RTP Payload for Redundant Audio Data.
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3119 A More Loss-Tolerant RTP Payload Format for MP3 Audio.
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2793 RTP Payload for Text Conversation.
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2032 RTP Payload Format for H.261 Video Streams.
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2190 RTP Payload Format for H.263 Video Streams.
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2250 RTP Payload Format for MPEG1/MPEG2 Video.
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2343 RTP Payload Format for Bundled MPEG.
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2429 RTP Payload Format for the 1998 Version of ITU-T Rec. H.263 Video
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2431 RTP Payload Format for BT.656 Video Encoding.
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2435 RTP Payload Format for JPEG-compressed Video.
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3016 RTP Payload Format for MPEG-4 Audio/Visual Streams.
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3047 RTP Payload Format for ITU-T Recommendation G.722.1.
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3189 RTP Payload Format for DV (IEC 61834) Video.
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3190 RTP Payload Format for 12-bit DAT Audio and 20- and 24-bit Linear Sampled Audio.
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3389 Real-time Transport Protocol (RTP) Payload for Comfort Noise (CN)
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2733 An RTP Payload Format for Generic Forward Error Correction.
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2833 RTP Payload for DTMF Digits, Telephony Tones and Telephony
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Signals.
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2862 RTP Payload Format for Real-Time Pointers.
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3351 RTP Profile for Audio and Video Conferences with Minimal Control. ( 1890 Obsolete )
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3555 MIME Type Registration of RTP Payload Formats.
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2508 Compressing IP/UDP/RTP Headers for Low-Speed Serial Links.
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1305 Network Time Protocol (Version 3) Specification, Implementation and Analysis.
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3339 Date and Time on the Internet: Timestamps.
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2246 The TLS Protocol Version 1.0
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3546 Transport Layer Security (TLS) Extensions. ( Updates 2246 )
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do we care?
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-----------
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2029 RTP Payload Format of Sun's CellB Video Encoding.
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usefull
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-------
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http://www.iana.org/assignments/rtp-parameters
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