How to control the decoder sampleRate

yunky dong

Hi,

I am working in DVRRDK 03.50.00.05, DM8168. I have tested the pre-integrated AAC audio decoder.

I successed decode the test file davinci.aac to davinci.pcm, but the pcm's sampleRate is 96KHz, I want to decode to 41KHz, so I add

ctx -> decOutArgs -> sampleRate = 41000; before Rpe_control (ctx -> decControCallDesc); in rpe_audio.c, but it doesn't work.

how can I control the pcm's sampleRate? Please guide Me.

Thanks

0 Ramprasad over 12 years ago

Hi Dong,

We can not control decoder's output sampleRate. You may have to use a resampler algorithm to resample the PCM to required sampleRate

BTW davinci.aac is a 44.1kHz stream and not 96kHz stream.

Ram

0 yunky dong over 12 years ago in reply to Ramprasad

but why i got the 96kHz?

0 Ramprasad over 12 years ago in reply to yunky dong

Hi Dong,

This is unexpected behaviour of decoder. Can you please check if it is returning 96kHz for all frames?

Also you test for any other 44.1kHz aac stream.

Ram

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