G.711 sources

charliescience · 04-12-06, 02:57 AM

Anybody provides me some sources of G.711 introduction?I wanna know this codec,but I found little related information on the Internet.Or,could email me:wangjian_charlie@163.com
Thanks!

MikeM · 04-12-06, 09:17 AM

Not sure what you are looking for, but this codec provides audio at 64kb streams. This is an uncompressed audio algorithm and will consume 64kb of bandwidth in each direction.

charliescience · 04-14-06, 02:15 AM

Thanks MikeM,I am using G.711 for an experiment,but I am not familiar with audio codecs.Could you talk more about the machenism of G.711.I know it is PCM,but I do not know how it works.

charliescience · 04-16-06, 09:30 PM

I use a phone.dump file as an example for RTP eavesdropping.Somebody told me that a most common G.711 frame size is:10 msec,80 byte.My whole captured packet which includes 14bytes ethernet header + 20bytes ip header + 8bytes udp header + 12bytes rtp header weights 214 bytes in total,so 214minus54,it indicates that each RTP package contains 2 g.711 audio frames.My question is how I should decode these 80bytes size frames,1byte - by - 1byte?for a-law or m-law are 1byte components?

charliescience · 04-19-06, 08:12 PM

I have decoded G.711 from RTP payload,and now I want to save it into a .wav file.I wonder how I could make a .wav file?Thanks you!

04-12-06, 02:57 AM	#1
charliescience Poster Status: Normal Member [Level I] Join Date: Feb 2006 Posts: 6	Topic/Thread# 37558, Post# 51854 Anybody provides me some sources of G.711 introduction?I wanna know this codec,but I found little related information on the Internet.Or,could email me:wangjian_charlie@163.com Thanks!

04-12-06, 09:17 AM	#2
MikeM Poster Status: Always present in our site Member [Level I] Join Date: Apr 2005 Posts: 103	Topic/Thread# 37558, Post# 51905 Not sure what you are looking for, but this codec provides audio at 64kb streams. This is an uncompressed audio algorithm and will consume 64kb of bandwidth in each direction.

04-14-06, 02:15 AM	#3
charliescience Poster Status: Normal Member [Level I] Join Date: Feb 2006 Posts: 6	Topic/Thread# 37558, Post# 52074 Thanks MikeM,I am using G.711 for an experiment,but I am not familiar with audio codecs.Could you talk more about the machenism of G.711.I know it is PCM,but I do not know how it works.

04-16-06, 09:30 PM	#4
charliescience Poster Status: Normal Member [Level I] Join Date: Feb 2006 Posts: 6	Topic/Thread# 37558, Post# 52291 I use a phone.dump file as an example for RTP eavesdropping.Somebody told me that a most common G.711 frame size is:10 msec,80 byte.My whole captured packet which includes 14bytes ethernet header + 20bytes ip header + 8bytes udp header + 12bytes rtp header weights 214 bytes in total,so 214minus54,it indicates that each RTP package contains 2 g.711 audio frames.My question is how I should decode these 80bytes size frames,1byte - by - 1byte?for a-law or m-law are 1byte components? Last edited by charliescience : 04-17-06 at 01:02 AM.

04-19-06, 08:12 PM	#5
charliescience Poster Status: Normal Member [Level I] Join Date: Feb 2006 Posts: 6	Topic/Thread# 37558, Post# 52611 I have decoded G.711 from RTP payload,and now I want to save it into a .wav file.I wonder how I could make a .wav file?Thanks you!