[alsa-devel] Noise at end of audio file
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?
Misael
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'm using aplay application for playback, the platform I'm working with is ti-omap.
Regards, Misael
-----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
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
Checked with some silence data and noise still present. Using aplay with "-M" (mmap) no noise is listen.
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
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
participants (2)
-
Lopez Cruz, Misael -
Takashi Iwai