gstreamer/gst-libs/gst/rtp
Sebastian Rasmussen d6dc1b6c46 rtpbasepayload: Let caps event also configure seqnum-offset
Previously the sequence number kept track of by GstRTPBasePayload would
only be set when going from READY to PAUSED state. This meant that a
downstream element that attempted to configure a basepayloader by
setting seqnum-offset e.g. in its sinkpad's caps template would have
trouble configuring the basepayloader. The reason was that the caps
event which arrives with the desired value for seqnum-offset did not
arrive at the basepayloader until caps negotiation took place,
significantly later than the transition from READY to PAUSED.

The result after this patch is that the default value for the
seqnum-offset property, or later set values for this property, will take
effect when going from READY to PAUSED like before. In addition the an
arriving caps event will also affect the basepayloaders configured
sequence number as the event arrives.
2014-02-24 12:10:26 +01:00
..
gstrtcpbuffer.c rtcpbuffer: do additional packet checks 2013-08-26 11:47:40 +02:00
gstrtcpbuffer.h rtp: add helpers for header extensions 2012-11-06 09:18:54 +01:00
gstrtpbaseaudiopayload.c rtpbaseaudiopayload: Avoid copying the data 2013-08-18 22:24:08 -04:00
gstrtpbaseaudiopayload.h Fix FSF address 2012-11-03 23:05:09 +00:00
gstrtpbasedepayload.c rtpbasedepayload: Fix typos in comments 2014-02-24 12:10:26 +01:00
gstrtpbasedepayload.h Fix FSF address 2012-11-03 23:05:09 +00:00
gstrtpbasepayload.c rtpbasepayload: Let caps event also configure seqnum-offset 2014-02-24 12:10:26 +01:00
gstrtpbasepayload.h Fix FSF address 2012-11-03 23:05:09 +00:00
gstrtpbuffer.c rtpbuffer: Allow subbuffering of empty buffers 2013-12-10 12:38:56 +01:00
gstrtpbuffer.h rtpbuffer: add gst_rtp_buffer_get_payload_bytes 2013-06-18 11:23:40 +02:00
gstrtphdrext.c rtp: fix ntp56 parsing 2012-11-06 09:18:54 +01:00
gstrtphdrext.h rtp: add helpers for header extensions 2012-11-06 09:18:54 +01:00
gstrtppayloads.c Fix FSF address 2012-11-03 23:05:09 +00:00
gstrtppayloads.h Fix FSF address 2012-11-03 23:05:09 +00:00
Makefile.am gst-libs: use GST_*_1_0 environment variables everywhere 2013-01-16 10:16:27 +00:00
README rtp: Add support for multiple memory blocks in RTP 2012-07-17 16:41:36 +02:00
rtp.h libs: Use foo/foo.h as single-include header consistently everywhere 2012-12-12 17:13:10 +00:00

The RTP libraries
---------------------

  RTP Buffers
  -----------
  The real time protocol as described in RFC 3550 requires the use of special
  packets containing an additional RTP header of at least 12 bytes. GStreamer
  provides some helper functions for creating and parsing these RTP headers.
  The result is a normal #GstBuffer with an additional RTP header.
 
  RTP buffers are usually created with gst_rtp_buffer_new_allocate() or
  gst_rtp_buffer_new_allocate_len(). These functions create buffers with a
  preallocated space of memory. It will also ensure that enough memory
  is allocated for the RTP header. The first function is used when the payload
  size is known. gst_rtp_buffer_new_allocate_len() should be used when the size
  of the whole RTP buffer (RTP header + payload) is known.
 
  When receiving RTP buffers from a network, gst_rtp_buffer_new_take_data()
  should be used when the user would like to parse that RTP packet. (TODO Ask
  Wim what the real purpose of this function is as it seems to simply create a
  duplicate GstBuffer with the same data as the previous one). The
  function will create a new RTP buffer with the given data as the whole RTP
  packet. Alternatively, gst_rtp_buffer_new_copy_data() can be used if the user
  wishes to make a copy of the data before using it in the new RTP buffer.
 
  It is now possible to use all the gst_rtp_buffer_get_*() or
  gst_rtp_buffer_set_*() functions to read or write the different parts of the
  RTP header such as the payload type, the sequence number or the RTP
  timestamp. The use can also retreive a pointer to the actual RTP payload data
  using the gst_rtp_buffer_get_payload() function.

  RTP Base Payloader Class (GstBaseRTPPayload)
  --------------------------------------------

  All RTP payloader elements (audio or video) should derive from this class.

  RTP Base Audio Payloader Class (GstBaseRTPAudioPayload)
  -------------------------------------------------------

  This base class can be tested through it's children classes. Here is an
  example using the iLBC payloader (frame based).

  For 20ms mode :

  GST_DEBUG="basertpaudiopayload:5" gst-launch-0.10 fakesrc sizetype=2
  sizemax=114 datarate=1900 ! audio/x-iLBC, mode=20 !  rtpilbcpay
  max-ptime="40000000" ! fakesink

  For 30ms mode :

  GST_DEBUG="basertpaudiopayload:5" gst-launch-0.10 fakesrc sizetype=2
  sizemax=150 datarate=1662 ! audio/x-iLBC, mode=30 !  rtpilbcpay
  max-ptime="60000000" ! fakesink

  Here is an example using the uLaw payloader (sample based).

  GST_DEBUG="basertpaudiopayload:5" gst-launch-0.10 fakesrc sizetype=2
  sizemax=150 datarate=8000 ! audio/x-mulaw ! rtppcmupay max-ptime="6000000" !
  fakesink

  RTP Base Depayloader Class (GstBaseRTPDepayload)
  ------------------------------------------------

  All RTP depayloader elements (audio or video) should derive from this class.