At Mon, 20 Aug 2007 10:44:14 -0500, Lopez Cruz, Misael wrote:

Hi,

I listen some noise at the end of playback of an audio file, with some debug I noticed that the noise appears in the last two period of the playback. I tried changing the minimum number of period (it was 16 and changed to 32) but the noise appears even before. Any idea what could be wrong?

With which apps and which device does this happen?

Takashi

At Wed, 22 Aug 2007 09:31:25 -0500, Lopez Cruz, Misael wrote:

I'm using aplay application for playback, the platform I'm working with is ti-omap.

Regards, Misael

Hm, then it's hard to tell... Check whether the noise occurs after playing just a silence data. This reduces the possibility of "junk data" in the last playback period.

If this happens with silence, then the problem is likely the hardware parameter change.

Takashi

-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Wednesday, August 22, 2007 7:23 AM To: Lopez Cruz, Misael Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Noise at end of audio file

At Mon, 20 Aug 2007 10:44:14 -0500, Lopez Cruz, Misael wrote:

...

Hi,

I listen some noise at the end of playback of an audio file, with some

...

debug I noticed that the noise appears in the last two period of the playback. I tried changing the minimum number of period (it was 16 and

...

changed to 32) but the noise appears even before. Any idea what could be wrong?

With which apps and which device does this happen?

Takashi

I thought that the noise could be a sync issue at the end of file, but after getting the time between two succesive 'period' data sendings and comparing it with the 'period time' given by aplay (verbose option), the differences is of only ~10 us, I mean the values in all others periods processed are in the same range, nothing special with the periods that are giving noise.

However if the audio length is less than one buffer, no noise is listen at all. The problem seems to be with files that don't fit in a single buffer.

Misael

-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Wednesday, August 22, 2007 10:02 AM To: Lopez Cruz, Misael Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Noise at end of audio file

At Wed, 22 Aug 2007 09:31:25 -0500, Lopez Cruz, Misael wrote:

I'm using aplay application for playback, the platform I'm working with is ti-omap.

Regards, Misael

Hm, then it's hard to tell... Check whether the noise occurs after playing just a silence data. This reduces the possibility of "junk data" in the last playback period.

If this happens with silence, then the problem is likely the hardware parameter change.

Takashi

-----Original Message----- From: Takashi Iwai [mailto:tiwai@suse.de] Sent: Wednesday, August 22, 2007 7:23 AM To: Lopez Cruz, Misael Cc: alsa-devel@alsa-project.org Subject: Re: [alsa-devel] Noise at end of audio file

At Mon, 20 Aug 2007 10:44:14 -0500, Lopez Cruz, Misael wrote:

...

Hi,

I listen some noise at the end of playback of an audio file, with

some

...

debug I noticed that the noise appears in the last two period of the

...

playback. I tried changing the minimum number of period (it was 16

and

...

changed to 32) but the noise appears even before. Any idea what

could

...

be wrong?

With which apps and which device does this happen?

Takashi