[Libav-user] converting pcm sample rate

[Michael Niedermayer]

On Wed, Nov 02, 2011 at 05:48:16PM +0700, Anton Adamansky wrote:
> Hello!
> 
> I'm converting sample rate for raw pcm buffer:
> 
> input:    2ch, in_srate: 22050  sample: 16bits
> output:  2ch, out_srate: 44100  sample: 16bits
> 
> So I'm using  swr_convert() function:
> 
> int out_samples =
>                     swr_convert(swr_ctx, buff_in, resampled_size /
> (out_channels * 2),
>                                           buff_out, input_pcm_len /
> (input_pcm_channels * 2));
> 
> I've got as result samples buffer with rate of 44100 and duration:
> (out_samples * 2 / out_srate) as half of original samples duration.
> 
> How can i convert this pcm buffer with preserved samples duration, so:
> (out_samples * 2 / out_srate) === (in_samples * 2 / in_srate) ?
> 
> What I'm missing?

you can pass 0,NULL as input to swr_convert() to flush the samples at
the end out.

[...]
-- 
Michael     GnuPG fingerprint: 9FF2128B147EF6730BADF133611EC787040B0FAB

Those who are best at talking, realize last or never when they are wrong.
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