On Thu, May 20, 2010 at 1:49 AM, Pham Quy <qu...@vega.com.vn> wrote: > Hi, > > How can I convert FROM ALAW file, which generated by asterisk apps > (monitor, or record app), to format (wav or mp3) that is playable by > music player?? Can Sox do this? >
>From alaw to wav, you can use Asterisk's CLI f" file convert /var/lib/asterisk/sounds/soundfile.alaw /var/lib/asterisk/sounds/soundfile.wav to go from alaw to mp3, first convert to wav, then use lame <options> /var/lib/asterisk/sounds/soundfile.wav /var/lib/asterisk/sounds/soundfile.mp3 sox looks like it can ogg/vorbis, but mine doesn't list mp3. You might fetch the source for sox and see if it can do mp3; lame is probably just as easy to obtain and use. murf > > I have an asterisk 1.6.2.6 on my CentOS 5.2. I record audio clip by > mixmonitor app and use file command to check the alaw output, and here > is output: > > --------- > 983006584-20100517-125002.alaw: RIFF (little-endian) data, WAVE audio, > ITU G.711 A-law, mono 8000 Hz > --------- > > How could file command recognize the format as there is no header in the > output file? Or Did I probably miss something making asterisk yield > incorrect alaw files? > > Please help, thanks > > Quyps > > On Thu, 2010-05-20 at 00:50 -0600, Steve Murphy wrote: > > Quyps-- > > > > I've noticed in general that the ulaw, alaw, gsm, slin files used and > > generated by > > asterisk do not have headers (the RIFF stuff), and asterisk is not > > expecting them. in general they > > will louse up Asterisk's ability to play the sound. They are just raw > > data and the extension > > on the file name (.gsm, or .ulaw, etc) is the only clue to the file > > format/contents. > > > > In general, if you need a sound file of your own making in a certain > > format, you can convert > > to most of the formats using sox in linux, but really, the best thing > > to do is record the source > > sound file in cd-quality sound WAV format, in 44 khz sampling rate, or > > higher, and then > > use sox to convert to 8khz format. Asterisk can do some of this via > > the file convert CLI > > command, ( on the asterisk cli, type "help file convert"). You'd have > > to judge for yourself > > if "file convert tt-weasels.gsm tt-weasels.ulaw" which would convert > > the 8khz gsm format to > > 8 khz ulaw, or "sox -v 0.7 tt-weasels.44khz.wav -r 8000 -c 1 -t sw > > tt-weasels.raw;" > > "sox -r 8000 -c 1 -t sw tt-weasels.raw -t ul tt-weasels.ulaw" which > > is the way the Asterisk > > sounds are produced from the the cd-quality sounds. They would seem a > > bit equivalent. > > > > I wonder if just "sox -v 0.7 tt-weasels.44khz.wav -r 8000 -c 1 -t ul > > tt-weasels.ulaw" would > > sound any better... you audio engineers out there may have an opinion. > > > > I've personally noted that not all linux distributions provide the > > same version of sox; > > some distribute sox with an absolute minimum of sound formats > > built-in. You may have > > to go out and find all the libraries and roll your own sox. > > > > murf > > > > > > > > > > > > On Wed, May 19, 2010 at 10:34 PM, Pham Quy <qu...@vega.com.vn> wrote: > > On Mon, 2010-05-17 at 17:49 +0700, Pham Quy wrote: > > > On Mon, 2010-05-17 at 13:06 +0700, Pham Quy wrote: > > > > hi all, > > > > > > > > I install Asterisk 1.6 on Centos 5.2 (kernel 2.6.18-92.el5 > > #1 SMP Tue > > > > Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 GNU/Linux) > > and do record > > > > audio clip with mixmonitor() as alaw file (softphone is > > also configured > > > > with alaw active only). Using file command i can get the > > following > > > > information > > > > > > > > 983006584-20100517-125002.alaw: RIFF (little-endian) data, > > WAVE audio, > > > > ITU G.711 A-law, mono 8000 Hz > > > > > > > > But when i install the same system on Centos 5.5 (kernel > > 2.6.18-92.el5 > > > > #1 SMP Tue Jun 10 18:51:06 EDT 2008 x86_64 x86_64 x86_64 > > GNU/Linux) i > > > > could get the same information with file command. File > > command > > > > recognized alaw file as JPEG image: > > > > > > > > 983006584-20100517-123825.alaw: JPEG image data > > > > > > > > I guess i may miss something when i setup the new on on > > Centos 5.5, but > > > > u dont know what it is. Anyone have idea about this? > > > > > > > > please help. > > > > > > > > Thanks in advance. > > > > Quyps > > > > > > I did check content of two alaw files (using a hex editor) > > generated > > > from two aboves cases. For the one fromo CentOS 5.2, > > beginning bytes > > > look likes : > > > > > > riff1^0.wavefmt........@...@.......fact.....^0.data.^0... > > > > > > and the one from CentOS 5.5 > > > > > > ......................RQVTV........XEMBAX............ > > > > > > It seem like the first one have some information about file > > format, > > > which make our convert tool works correctly, and which the > > second one > > > doesnt have. > > > > > > Can you explain to me this different, and how can i get the > > information > > > as the first one? > > > > > > Thanks in advances, > > > Quyps > > > > This question have been asked for a while, I really need some > > help > > here? > > > > Thanks in advance. > > Quyps > > > > > > -- > > > _____________________________________________________________________ > > -- Bandwidth and Colocation Provided by > > http://www.api-digital.com -- > > New to Asterisk? Join us for a live introductory webinar every > > Thurs: > > http://www.asterisk.org/hello > > > > asterisk-users mailing list > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > > > > > -- > > Steve Murphy > > ParseTree Corp > > > > -- > > _____________________________________________________________________ > > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > > New to Asterisk? Join us for a live introductory webinar every Thurs: > > http://www.asterisk.org/hello > > > > asterisk-users mailing list > > To UNSUBSCRIBE or update options visit: > > http://lists.digium.com/mailman/listinfo/asterisk-users > > > > -- > _____________________________________________________________________ > -- Bandwidth and Colocation Provided by http://www.api-digital.com -- > New to Asterisk? Join us for a live introductory webinar every Thurs: > http://www.asterisk.org/hello > > asterisk-users mailing list > To UNSUBSCRIBE or update options visit: > http://lists.digium.com/mailman/listinfo/asterisk-users > -- Steve Murphy ParseTree Corp
-- _____________________________________________________________________ -- Bandwidth and Colocation Provided by http://www.api-digital.com -- New to Asterisk? Join us for a live introductory webinar every Thurs: http://www.asterisk.org/hello asterisk-users mailing list To UNSUBSCRIBE or update options visit: http://lists.digium.com/mailman/listinfo/asterisk-users
