[Draft] RTCP Parser sketched.

[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting class as iterator going through individual packets in compound RTCP packet.

 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample4 introduce generic parser written with template meta-programming. Set of supported packets to parser can be
configured at runtime.

BUG=webrtc:5260
COMMIT=false

[danilchap, 2016-01-11 10:01:13]

Description was changed from

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting 'ParsingPacket' class as iterator going through
individual packets in compound RTCP packet.

rtcp_parser.h provided to demonstrate how ParsingPacket together with
concrete RTCP packet classes can be used to write a parser.

ParsingPacket also has an optional ParsePacket for alternative way of parsing
individual packets.
Currently it is not useful because base RtcpPacket class has no interesting
virtual functions for parsed packet.


BUG=webrtc:5260
R=åsapersson,språng
==========

to

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting 'ParsingPacket' class as iterator going through
individual packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without ParsingPacket.
other sample_rtcp_parser demonstrate slightly different ways how ParsingPacket
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
R=åsapersson,språng
==========

[danilchap, 2016-01-14 14:49:18]

Description was changed from

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting 'ParsingPacket' class as iterator going through
individual packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without ParsingPacket.
other sample_rtcp_parser demonstrate slightly different ways how ParsingPacket
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
R=åsapersson,språng
==========

to

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting 'ParsingPacket' class as iterator going through
individual packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without ParsingPacket.
other sample_rtcp_parser demonstrate slightly different ways how ParsingPacket
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
COMMIT=false
R=åsapersson,språng
==========

[danilchap, 2016-02-12 10:05:01]

danilchap@webrtc.org changed reviewers:
- asapersson@webrtc.org, sprang@webrtc.org

[danilchap, 2016-02-12 15:18:21]

Description was changed from

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting 'ParsingPacket' class as iterator going through
individual packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without ParsingPacket.
other sample_rtcp_parser demonstrate slightly different ways how ParsingPacket
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
COMMIT=false
R=åsapersson,språng
==========

to

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting class as iterator going through individual
packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without new
CommonHeader class.
other sample_rtcp_parser demonstrate slightly different ways how CommonHeader
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
COMMIT=false
==========

[danilchap, 2016-08-15 08:19:15]

Description was changed from

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting class as iterator going through individual
packets in compound RTCP packet.

sample_rtcp_parser0 demonstrate how Parser can look like without new
CommonHeader class.
other sample_rtcp_parser demonstrate slightly different ways how CommonHeader
can be used:
 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample3 demonstrates how it can be used without template functions.

BUG=webrtc:5260
COMMIT=false
==========

to

==========
[rtp_rtcp] RTCP Parser sketched.

alternative approach to CL#1476793002:
instead of copying RTCP header class as is, this CL adds buffer pointer to it.
This allows to use the resulting class as iterator going through individual
packets in compound RTCP packet.

 sample1 demonstrates how it can be used directly with a template functions
 sample2 - how it can be used indirectly with template functions
 sample4 introduce generic parser written with template meta-programming. Set of
supported packets to parser can be
configured at runtime.

BUG=webrtc:5260
COMMIT=false
==========