Abnormal sounds encoded data of audio

Michael Chen

Prodigy 190 points

Hi all:

I use the DVRRDK 4.1 ,8168 evm.

enc param:samplerate 32K,bitrate 48k,Stereo.

The audio encoding process:

while(1)

{

fread(pcm);

Aenc_process(pcm);

fwrite(aac);

}

The file of aac sounds a little problem.

But I use the process:

while(1)

{

fread(pcm);

usleep(32000);

Aenc_process(pcm);

fwrite(aac);

}

It sounds OK.

Who knows what it is?

I uploaded the two aac files:

over 11 years ago

0 Sivagamy Govindasamy over 11 years ago

TI__Expert 6950 points

Aenc_process() is a blocking call and the time delay cannot make any difference file input mode.

The problem lies somewhere in the input side only. Are you reading same no. of bytes on every fread()?
Check Aenc_process() return value.

0 Michael Chen over 11 years ago in reply to Sivagamy Govindasamy

Prodigy 190 points

1、read 4096 bytes every fread(),the pcmfile is enough big.

if((to_read = (fread(inBuf,1,4096,outPcmFile))) != 4096)
{
fseek(outPcmFile,0,SEEK_SET);
fread(inBuf,1,4096,outPcmFile);
}

2、if Aenc_process() != 0 It will break so the value of return is 0

if(Aenc_process())

{

break;

}

0 Michael Chen over 11 years ago in reply to Sivagamy Govindasamy

Prodigy 190 points

And I saved the fread pcm ,it soud ok.

0 Sivagamy Govindasamy over 11 years ago in reply to Michael Chen

TI__Expert 6950 points

Is this issue recreatable in file in encode demo present in 4.1 release?

0 Michael Chen over 11 years ago in reply to Sivagamy Govindasamy

Prodigy 190 points

not the demo,I write the program to refer the demo.

when i use the dvrrdk 3.5 it also has the problem.

0 Michael Chen over 11 years ago in reply to Sivagamy Govindasamy

Prodigy 190 points

I uploaded the two different situations AAC files, you can try listening

0 Michael Chen over 11 years ago in reply to Sivagamy Govindasamy

Prodigy 190 points

the demo is ok~

0 Sivagamy Govindasamy over 11 years ago in reply to Michael Chen

TI__Expert 6950 points

If the demo works fine, then I dont think there is any issue with Aenc_process() as such. Demo is also just doing a file read / encode & file out.

Check if you are feeding correct in buf sizes as expected by codec.

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Abnormal sounds encoded data of audio