mods

MPEG-4编解码的实现(包括MPEG4视音频编解码)

Common Code Library: Modification history

v1.0.0  - Initial version, based on RAT v3.2.7
	* 14 November 1998

v1.0.1  - Added HMAC authentication code
	- Added timeout to udp_recv()
	- Added authentication of Mbus messages
	- Added RTP library
	- Added select and fd_set functions to net_udp.[ch]
	- IPv6 code now runs on the pre-release stack for Solaris 2.7
	- Mbus code support a configuration file on Unix, and the registry
	  on Win32, to save/restore settings
	- Add udp_host_addr() to get a text-version of the address to which
	  a socket is bound.
	- Set IPv6 ttl and loopback state correctly on Solaris
	- Move mbus hearbeat code into this library
	- Remove key expiry from the mbus code, since it created race
	  conditions when multiple tools for a single conference were
	  started either side of the expiry time.
	- Update mbus addressing scheme - names are now sets of tokens, if the
	  set of tokens in the destination address is a subset of the address 
	  of the entity receiving that message then the message is accepted. An
	  empty set is a valid destination address for a message, and that will
	  be accepted by all receivers (ie: a wildcard).
	- Remove channel ID from mbus code.
	- Fix configure script to work with solaris 2.7 where inet_aton() and 
	  inet_pton() have prototypes but no implementation.
	* 31 March 1999 [rat v4.0.0]

v1.0.2  - Assorted fixes to RTP library
	- Fix bounds overruns in memory.c - will now run with -DDEBUG_MEM
	  with the bounds checker on.
	- Add timestamp to mbus packet headers.
	- Add mbus_qmsgf()
	- Cleanup mbus transmission path
	- Add support for DES encryption to the mbus (on by default)
	- Fix DES code
	- Mbus keeps a cache of other entities, and only allows sending of
	  reliable messages to known unicast addresses. 
	- Mbus error function now takes a "type of error" argument
	- Added xrealloc()
	- Fix reordering of mbus messages
	* 14 May 1999 [rat v4.0.1]

v1.0.3  - Fix inet_aton() in net_udp.c
	* 15 May 1999 [rat v4.0.2]

v1.0.4  - Fix compilation with Microsoft IPv6 stack
	- Solaris 2.5.1 doesn't have vsnprintf(), use vsprintf() instead
	  and don't worry about the possible buffer overflow problems. 
	  Reported by Holger Wirtz.
	- Added mbus_addr_valid()
	- Added timeout to mbus_recv()
	- Fixes to mbus code from Dirk Kutscher
	* 2 June 1999 [rat v4.0.3]

v1.0.5  - Not quite sure what happened with this version, but if you have
	  it it's probably not a good idea to use it! :-)

v1.0.6  - Add ability to send to one port whilst receiving on another, 
	  requested by Henning Schulzrinne.
	- Add mbus_cmd_handler() to change the function handling the
	  reception of mbus commands.
	- Compilation fixes for Irix 6.5 contributed by Bob Olson.
	- Add extra sanity checking to mbus_recv()
	- Add extra sanity checking to mbus_parse_*
	- Fix source address passed to mbus_recv() callback - was missing
	  the "(" and ")" around it.
	- Fix memory leak in mbus_recv()
	- Fixes for configure script on 64 bit IRIX from Peter Orbaek
	- Move base64 tests into test_base64.c and integrate with the test suite
	* Released 5 July 1999 

v1.0.7  - Add udp_exit to close sockets and leave multicast groups if necessary.
	- Fix mbus_exit close sockets.
	- Move the code to deal with the mbus configuration into mbus_config.c
	  which will make it easier to write an mbus packet logger without code 
	  duplication (such a logger can't easily be part of mbus.c, since it's
	  needs conflict with correct protocol operation).
	- Note that v1.3 of the Microsoft Research IPv6 stack requires an explicit
	  route to be added for multicast traffic before a group can be joined. If
	  you get errors in the IPV6_ADD_MEMBERSHIP setsockopt, this is probably
	  the reason. We could specify an interface explicitly, but which one to
	  pick?
	- Updates to the IPv6 code for the Detexis Musica IPv6 stack
	- Updates to the RTP code from Markus Germeier: time-out and delete sources,
	  fix X but in RTP header, add support for sending BYE packets.
	- Add inet_pton() and inet_ntop() implementations, for those platforms
	  which are missing them.
	- Add gettimeofday() workaround for win32
	- Add drand48() workaround for win32
	* Released 20 August 1999

v1.0.8  - Add mbus_sent_all()
	- Add loop count to mbus_recv(), so it will always return after 10
	  packets have been received. The prevents a denial of service attack
	  if packets are sent faster than the timeout period.
	- Add binary tree.
	- Add OpenBSD fixes from Angelos D. Keromytis
	- Add Jerry Isdale's debug_dump() routine.
	- Add fix to RTP init_seq() to correct bug(?) in RFC1889 which
	  means we incorrectly report the one packet lost in the first
	  reporting interval. Fix by Bill Fenner.
	- Make the RTP create_source() routine return a pointer to the
	  source. Patch from Bill Fenner.
	- Changes to the probation code in rtp.c from Bill Fenner.
	- Fix types in the RTP source struct.
	- Add a SOURCE_CREATED event to the RTP callback.
	- Add option to accept RTP packets before a corresponding RTCP
	  packet has been received.
	- Add RX_RR_EMPTY event to the RTP code, to indicate that an empty
	  reception report (ie: no report blocks) has been received.
	- Add RX_RTCP_START and RX_RTCP_FINISH events to the RTP code.
	- debug_msg() now displays the pid
	- The mbus code now maintains the list of active sources more correctly, 
	  making mbus_addr_valid() useful
	- rtp_init() now takes separate rx_port and tx_port, instead of a
	  single port for both sending and receiving.
	- Add rtp_get_addr(), rtp_get_rx_port(), rtp_get_tx_port() and rtp_get_ttl()
	- Change return type of rtp_recv to int (was void).  Returns TRUE if
	  packets were processed, FALSE otherwise.
	- Timeout RRs from the RTP database, if they're not refreshed for
	  3 times the RTCP reporting interval
	- rtp_update() only expires sources once per reporting interval, to
	  avoid burning too many cycles.
	- Mbus updates contributed by Markus Germeier
		- we now can configure the multicast address and port which the
		  mbus should use in ~/.mbus 
		- honor the SCOPE setting in ~/.mbus
		- expire sources we haven't heard from for a while
		- fixes small memory leak in remove_other_addr
		- mbus_exit now sends a mbus.quit and cleans up other_* structures
	- RTP updates contributed by Timur Friedman.
		- Add support for RTCP APP packets
		- Add support for a promiscuous mode to the RTP code, when in
		  promiscuous mode there is no wait for a minimum number of RTP
		  packets before recognizing a source.
		- Add the functions rtp_setopt() and rtp_getopt() that can be used
		  to control various options (right now just promiscuous mode).
		- Split rtp_recv_data() into two functions.
	* 5 October 1999

v1.0.9  - Ignore ECONNREFUSED in net_udp.c
	- Add mbus_rendezvous_waiting() and mbus_rendezvous_go() to enable
	  easy rendezvous between multiple processes.
	- Change rtp_setopt() and rtp_getopt() to take boolean options only.
	- Remove rtp_weak_validation(), use rtp_setopt(RTP_OPT_WEAK_VALIDATION)
	  instead.
	- Delete RTP database entries which haven't been heard from for
	  more than 5 times the RTCP reporting interval.
	* 2 November 1999 [rat v4.1.1]

v1.0.10 - Mbus updates from Markus Germeier, which fix compatibility with
	  the Uni Bremen implementation:
		- mbus.bye() signals an entity when it leaves. (mbus.quit commands
		  an entity to leave)
		- Generate and work with 64 bit DES keys. Generate parity bits for key.
		  Check if key in configuration file sets parity bits correctly.
		- mbus_heartbeat(m, 1) should send an mbus.hello() every second and
		  not every two seconds
		- HMAC-MD5 should read HMAC-MD5-96
		- Honor the MBUS environment variable for the MBUS configuration file
		- The TZI Mbus implementations generate spaces in configuration file,
		  which mislead the UCL Mbus to dump core. Allow Spaces in .mbus
		- Address must be unique
		- Delete failed reliable messages if err_handler is present
	- Fix uninitialized use of session->last_update in RTP code
	- Fix assertion failures in RTP library when sending RTCP packets
	- Recognize, but ignore, profile specific extensions to RTCP SR/RR packets
	- Update RTCP reporting interval calculation
	- Implement reverse reconsideration of RTCP reporting interval
	- Fix tv_diff in rtp.c to handle negative results
	- Remove rtp_get_encryption_key(), the user of the library is assumed to 
	  remember the passphrase used and doesn't need access to the internal
	  form of the key.
	- GNU autoconf modifications from Bill Fenner
	- Global change of integer types, and removal of compatibility defines:
		u_int8  -> u_int8_t
		u_int16 -> u_int16_t
		u_int32 -> u_int32_t
	  and the same for the signed varients.
	- Implement encryption in the RTP code
	- Ignore connection refused errors in IPv4 UDP send.
	- Hide definition of struct mbus_config
	- Add a version number to the mbus config file
	- Fixes for FreeBSD v3.2 with INRIA IPv6 stack from Fred Templin
	- Add configure check for sin6_len in struct sockaddr_in6 (seems
	  that FreeBSD has this, but many systems don't)
	- Fix batching of multiple mbus messages into one packet.
	* 13 December 1999 [rat v4.1.2]

v1.1.0  - Changed autoconf generated header to uclconf.h.
	- Changed library name to uclmmbase to be consistent with other libs.   
	- Add RTP_OPT_FILTER_MY_PACKETS