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ILBC codec 설치

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출처 http://wiki.kolmisoft.com/index.php/ILBC_codec

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The iLBC source has been removed from Asterisk due to licensing concerns

Can be installed back again using instructions from page: http://www.voip-info.org/wiki/view/iLBC

Simple instructions if above guide does not work:

Go to your asterisk directory:

cd /usr/src/ASTERISKDIRECTORY

Afterwards

cd /contrib/scripts

wget -P codecs/ilbc http://www.ietf.org/rfc/rfc3951.txt

wget -q -O - http://www.ilbcfreeware.org/documentation/extract-cfile.txt | tr -d '\r' > codecs/ilbc/extract-cfile.awk

cd codecs/ilbc && awk -f extract-cfile.awk rfc3951.txt

Copy all contents from

/usr/src/ASTERISKDIRECTORY/contrib/scripts/codecs/ilbc/ to /usr/src/ASTERISKDIRECTORY/codecs/ilbc/ directory

Recompile Asterisk for ilbc codec support:

cd /usr/src/ASTERISKDIRECTORY

./configure

make

Select ilbc codec for installation

make menuselect

make install

To check if codec is installed, connect to Asterisk CLI and issue command:

core show translations

You should get a similar output:

server*CLI> core show translation

Translation times between formats (in milliseconds) for one second of data

Source Format (Rows) Destination Format (Columns)

g723 gsm ulaw alaw g726aal2 adpcm slin lpc10 g729 speex ilbc g726 g722

g723 - 2 2 2 2 2 1 3 6 - 14 2 2

gsm 8 - 2 2 2 2 1 3 6 - 14 2 2

ulaw 8 2 - 1 2 2 1 3 6 - 14 2 2

alaw 8 2 1 - 2 2 1 3 6 - 14 2 2

g726aal2 8 2 2 2 - 2 1 3 6 - 14 2 2

adpcm 8 2 2 2 2 - 1 3 6 - 14 2 2

slin 7 1 1 1 1 1 - 2 5 - 13 1 1

lpc10 8 2 2 2 2 2 1 - 6 - 14 2 2

g729 8 2 2 2 2 2 1 3 - - 14 2 2

speex - - - - - - - - - - - - -

ilbc 9 3 3 3 3 3 2 4 7 - - 3 3

g726 8 2 2 2 2 2 1 3 6 - 14 - 2

g722 8 2 2 2 2 2 1 3 6 - 14 2 -

---------------------------------------------------------------

Index: include/asterisk/audiohook.h
===================================================================
--- include/asterisk/audiohook.h (revision 147197)
+++ include/asterisk/audiohook.h (working copy)
@@ -56,6 +56,8 @@
  AST_AUDIOHOOK_TRIGGER_SYNC = (1 << 2),  /*!< Audiohook wants to be triggered when both sides have combined audio available */
 };
 
+#define AST_AUDIOHOOK_SYNC_TOLERANCE 100 /*< Tolerance in milliseconds for audiohooks synchronization */
+
 struct ast_audiohook;
 
 /*! \brief Callback function for manipulate audiohook type
Index: main/audiohook.c
===================================================================
--- main/audiohook.c (revision 147197)
+++ main/audiohook.c (working copy)
@@ -130,12 +130,19 @@
  struct ast_slinfactory *factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_factory : &audiohook->write_factory);
  struct ast_slinfactory *other_factory = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->write_factory : &audiohook->read_factory);
  struct timeval *time = (direction == AST_AUDIOHOOK_DIRECTION_READ ? &audiohook->read_time : &audiohook->write_time), previous_time = *time;
+ int our_factory_ms;
+ int other_factory_samples;
+ int other_factory_ms;
 
  /* Update last feeding time to be current */
  *time = ast_tvnow();
 
+ our_factory_ms = ast_tvdiff_ms(*time, previous_time) + (ast_slinfactory_available(factory) / 8);
+ other_factory_samples = ast_slinfactory_available(other_factory);
+ other_factory_ms = other_factory_samples / 8;
+
  /* If we are using a sync trigger and this factory suddenly got audio fed in after a lapse, then flush both factories to ensure they remain in sync */
- if (ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_SYNC) && ast_slinfactory_available(other_factory) && (ast_tvdiff_ms(*time, previous_time) > (ast_slinfactory_available(other_factory) / 8))) {
+ if (ast_test_flag(audiohook, AST_AUDIOHOOK_TRIGGER_SYNC) && other_factory_samples && (our_factory_ms - other_factory_ms > AST_AUDIOHOOK_SYNC_TOLERANCE)) {
   if (option_debug)
    ast_log(LOG_DEBUG, "Flushing audiohook %p so it remains in sync\n", audiohook);
   ast_slinfactory_flush(factory);