2008-09-16 03:28:04 how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Bill Xie (CHINA)

Message: 62211

I use uclinx lib libbfgdots g729a to encode 16bit mono PCM data file to bitstream file ,the part of bitstream is:

21 6B 50 00 BA 0D 36 4C A2 17 DA 72 C1 0A 21 6B 50 00 B6 2D 56 59 68 2E 8E 32 C7 A3 21 6B 50 00 F7 68 BA CC 4F 48 F8 72 9A 8E 21 6B 50 00 D9 23 CF 66 73 3D B4 10 98 BD 21 6B 50 00 67 08 62 CC 12 EE 38 30 C1 0E 21 6B 50 00 B2 0D 18 59 3E C0 BE 32 57 8F 21 6B 50 00 B4 2D 93 59 97 EE C1 72 C7 40 21 6B 50 00 66 0D 58 19 E2 EE 19 72 91 90 21 6B 50 00 B0 0D 40 19 5B AE E6 31 4B D5

In uclinux can decode bitstream to pcm file to play,but I want to decode this encoded files in winows.

in widow xp I down G729AnexA.G729AnexA using unpakced.0x007f ->0 bit 0x0081->1 bit ,transform the packed bitstrem to upakceted bitstream

For example:

transform: 21 6B 50 00 9B 33 A0 40 FA 00 7A C2 AC 45

TO:

21 6B 50 00 81 00 7F 00 7F 00 81 00 81 00 7F 00 .

81 00 81 00 7F 00 7F 00 81 00 81 00 7F 00 7F 00

81 00 81 00 81 00 7F 00 81 00 7F 00 7F 00 7F 00

7F 00 7F 00 7F 00 81 00 7F 00 7F 00 7F 00 7F 00

7F 00 7F 00 81 00 81 00 81 00 81 00 81 00 7F 00

81 00 7F 00 7F 00 7F 00 7F 00 7F 00 7F 00 7F 00

7F 00 7F 00 7F 00 81 00 81 00 81 00 81 00 7F 00

81 00 7F 00 81 00 81 00 7F 00 7F 00 7F 00 7F 00

81 00 7F 00 81 00 7F 00 81 00 7F 00 81 00 81 00

7F 00 7F 00 7F 00 81 00 7F 00 7F 00 7F 00 81 00

7F 00 81 00

but the using G729AnexA cann't decode unpacket bitstream which is encode by g729a in uclinux. In window bitstream encoded by G729AnexA ,then can decoded this bistream right.

Pls help me to solve this problem,thank you.

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2008-09-16 03:41:24 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Bill Xie (CHINA)

Message: 62212

I download g729 from this www.itu.int/rec/T-REC-G.729-200701-I/en

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2008-09-16 07:01:41 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Robin Getz (UNITED STATES)

Message: 62239

Bill:

We have shown that the G729 lib is compatible with various other G729 phones.

Did you verify that the Windows software works with other 729 implmentations before trying the Blackfin version?

-Robin

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2008-09-17 04:47:33 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Bill Xie (CHINA)

Message: 62299

Hi Robin

Thank you replay my question, I add some files as accessory.

source.wav --------------------------- source pcm file

bitstream.bit ----------------------------- encoded by uclinux+g729a

uclinux-decoded.wav --------------- decoded by uclinux+9729a

g729Annexa.rar ------------------- - source g729a code

convert_file_bitstream.cpp ---------- code which convert bitstream.bit to unpacked bit file

maybe the g729Annexa.rar is not compatible with uclinux g729

convert_file_bitstream.cpp

bitstream.bit

source.wav

uclinux-decoded.wav

g729Annexa.rar

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2008-09-17 20:00:38 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Robin Getz (UNITED STATES)

Message: 62343

Bill:

I don't have the expertise to look at the files.

We have tested things with other G.729 phones (hardware) and it works. I don't know if the code that you have is the problem or not, and don't have the time/understanding of 729 to look.

-Robin

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2008-09-17 22:54:37 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Bill Xie (CHINA)

Message: 62351

Thank you. It is no problem when G729 is used at uniform platform to decode and encode . Do you test G729 at different platform,for instance PCM wave file is encoed in uclinux, and decode this encoded file in window? I cann't make sure that g729 is compatible with different platform.

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2008-09-18 09:57:16 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Robin Getz (UNITED STATES)

Message: 62385

Bill:

We have tested with external phones - polycom IP300SIP (and others)

www.amazon.com/Polycom-2200-11330-001-Soundpoint-Protocol-Desktop/dp/B00069TYNE

-Robin

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2008-09-19 06:33:44 Re: how to decode voice file which is encoded by G729a Bf531+uclinux in window os

Bill Xie (CHINA)

Message: 62436