From mboxrd@z Thu Jan  1 00:00:00 1970
From: Takashi Iwai <tiwai@suse.de>
Subject: Re: trace PCM data from usb bus to alsa lib
Date: Wed, 17 Jun 2009 17:52:22 +0200
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To: ZeroCluo <Zero.CLuo@gmail.com>
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At Wed, 17 Jun 2009 08:33:15 +0000 (UTC),
ZeroCluo wrote:
> =

> Takashi Iwai <tiwai <at> suse.de> writes:
> =

> > =

> > At Wed, 17 Jun 2009 16:10:26 +0800,
> > Zero Luo wrote:
> > > =

> > > Dear Takashi,
> > > =A0
> > > =A0=A0 Data from usb dongle is 16K*16 bit PCM data.
> > =

> > And what is the format and channels you are using in alsa-lib?
> > alsa-lib itself can convert formats and channels automatically if neede=
d.
> > =

> > Takashi
> =

> =

>  In alsa-lib ,I set data format as 8K * mulaw .
>         hwparams.format =3D SND_PCM_FORMAT_MU_LAW;
>         hwparams.rate =3D 8000;
>         hwparams.channels =3D 1;
>  Yes,indeed alsa-lib help to convert formats.But before alsa-lib convert =
pcm =

> data to mulaw,I dumped the src data in snd_pcm_mulaw_encode() which alrea=
dy =

> has no "0000" .

Well, another question is whether the output result is correct.
Did you get broken output or so?


Takashi