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rtph264pay: add support for STAP-A bundling

Submitted by Dirk-Jan C. Binnema

Link to original bug (#792825)

Description

Created attachment 367317
Patch implementing STAP-A for the RTP H.264 payloader

RFC 6184 (https://tools.ietf.org/html/rfc6184#section-5.7) describes how to aggregate (bundle) small RTP packets (typically SPS/PPS); this can improve bandwidth in some cases.

The rtph264depay already supports depayloading such bundled packets, but so far the payloader does not rtph264pay does not; attached patch attempts to change that.

Some notes:

  • By default, no aggregation is done, but there's a property "do-aggregate" now to enable this
  • I've attempted to change the existing payloader as little as possible

Patch is against git HEAD.

Patch 367317, "Patch implementing STAP-A for the RTP H.264 payloader":
stap-a.patch