[Libav-user] Issue in Decoding AMR

[NITIN GOYAL]

Hi

I am trying to decode some Amrnb audio using the avcodec_decode_audio3
function. I want to input frame by frame and save the raw output frame by
frame as well.

*int len = avcodec_decode_audio3(mpCodecContext, (short *)outbuf,
&out_size, &pkt);*

Now, the issue is that when I give the input of a frame of 32 bytes without
the AMR header, i got the len >0, but the outsize value is always 640 that
I am sure is not correct and I am also able to read the 640 values in the
output buffer.

When i try to extract the raw audio from my media file, using the
standalone ffmpeg windows build i get a different output, which is correct.
I have used the following command:

*ffmpeg -i input.amr -f amr Output.raw*
*
*
*Now, I am not sure if the output of **avcodec_decode_audio3 function **is
correct or  not as even if i send the bugger input say 64 byte or 128 or
the whole while at one go, the output buffer size is always 640 bytes.*
*
*
*Can someone let me know where I am doing the mistake for the same as I
want the same out as the standalone .*
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*I have the sample attached which I am trying to decode also I have
attached the sample code which I am using to decode.*
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*Regards*
*Nitin*
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