[alsa-devel] pcm timer resolution out of range (rate = 0, period_size = 1), Division by zero in kernel
Hi,
We are working with 2.6.32 kernel. we are working with ALSA model codec driver for conexant chipset. we are using OSS emulation for audio playback and recording.
we are not setting the fragmenttaion block using OSS ioctl function (SNDCTL_DSP_SETFRAGMENT) , assuming that it will be taken care by the ALSA framework based on the sampling rate, bits per sample etc.
we are facing the below issue randomly.
ALSA sound/core/pcm_timer.c:71: -calling VIDIOC_pcm timer resolution out of range (rate = 0, period_size = 1) Division by zero in kernel.
We tried to program the fragmentation block after the sampling rate, bits per sample etc are configured. it is working fine for 5 or 6 iterations for recording and playback.
after that the audio quality is gone bad. the audio is not smooth and it is sharp.
could you please help to resolve this problem.
Thank you, Sreedhar.
2011/12/22, Appalayagari Sreedhar sreecha01@gmail.com:
Hi,
We are working with 2.6.32 kernel. we are working with ALSA model codec driver for conexant chipset. we are using OSS emulation for audio playback and recording.
we are not setting the fragmenttaion block using OSS ioctl function (SNDCTL_DSP_SETFRAGMENT) , assuming that it will be taken care by the ALSA framework based on the sampling rate, bits per sample etc.
we are facing the below issue randomly.
ALSA sound/core/pcm_timer.c:71: -calling VIDIOC_pcm timer resolution out of range (rate = 0, period_size = 1) Division by zero in kernel.
Do your controller really support 1 frame per period (period_size = 1) ?
What is the value of .period_bytes_min and other parameters in snd_pcm_hardware and format supported ?
We tried to program the fragmentation block after the sampling rate, bits per sample etc are configured. it is working fine for 5 or 6 iterations for recording and playback.
after that the audio quality is gone bad. the audio is not smooth and it is sharp.
could you please help to resolve this problem.
Hi Raymond,
We are working with DM368 processor and cx20709 conexant external codec interfaced via McBSP.
The davinci pcm hw params is below. (from davinci-pcm.c file)
static struct snd_pcm_hardware davinci_pcm_hardware = { .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_KNOT), .rate_min = 8000, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 128 * 1024, .period_bytes_min = 32, .period_bytes_max = 8 * 1024, .periods_min = 16, .periods_max = 255, .fifo_size = 0, };
and we are configuring from user space using OSS ioctl for Speed. Format and Bits Per Sample.
Speed = 8kHz/16kHz Format = AFMT_S16LE Bits Per Sample = 16 Channels = Stereo/Mono
I am new to ALSA and OSS. Please let me know if you need further details.
Thank you, Sreedhar.
On 12/23/11, Raymond Yau superquad.vortex2@gmail.com wrote:
2011/12/22, Appalayagari Sreedhar sreecha01@gmail.com:
Hi,
We are working with 2.6.32 kernel. we are working with ALSA model codec driver for conexant chipset. we are using OSS emulation for audio playback and recording.
we are not setting the fragmenttaion block using OSS ioctl function (SNDCTL_DSP_SETFRAGMENT) , assuming that it will be taken care by the ALSA framework based on the sampling rate, bits per sample etc.
we are facing the below issue randomly.
ALSA sound/core/pcm_timer.c:71: -calling VIDIOC_pcm timer resolution out of range (rate = 0, period_size = 1) Division by zero in kernel.
Do your controller really support 1 frame per period (period_size = 1) ?
What is the value of .period_bytes_min and other parameters in snd_pcm_hardware and format supported ?
We tried to program the fragmentation block after the sampling rate, bits per sample etc are configured. it is working fine for 5 or 6 iterations for recording and playback.
after that the audio quality is gone bad. the audio is not smooth and it is sharp.
could you please help to resolve this problem.
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
Hi,
any suggestion for me to resolve this issue?
-Sreedhar
On 12/23/11, Appalayagari Sreedhar sreecha01@gmail.com wrote:
Hi Raymond,
We are working with DM368 processor and cx20709 conexant external codec interfaced via McBSP.
The davinci pcm hw params is below. (from davinci-pcm.c file)
static struct snd_pcm_hardware davinci_pcm_hardware = { .info = (SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_PAUSE), .formats = (SNDRV_PCM_FMTBIT_S16_LE), .rates = (SNDRV_PCM_RATE_8000 | SNDRV_PCM_RATE_16000 | SNDRV_PCM_RATE_22050 | SNDRV_PCM_RATE_32000 | SNDRV_PCM_RATE_44100 | SNDRV_PCM_RATE_48000 | SNDRV_PCM_RATE_88200 | SNDRV_PCM_RATE_96000 | SNDRV_PCM_RATE_KNOT), .rate_min = 8000, .rate_max = 96000, .channels_min = 2, .channels_max = 2, .buffer_bytes_max = 128 * 1024, .period_bytes_min = 32, .period_bytes_max = 8 * 1024, .periods_min = 16, .periods_max = 255, .fifo_size = 0, };
and we are configuring from user space using OSS ioctl for Speed. Format and Bits Per Sample.
Speed = 8kHz/16kHz Format = AFMT_S16LE Bits Per Sample = 16 Channels = Stereo/Mono
I am new to ALSA and OSS. Please let me know if you need further details.
Thank you, Sreedhar.
On 12/23/11, Raymond Yau superquad.vortex2@gmail.com wrote:
2011/12/22, Appalayagari Sreedhar sreecha01@gmail.com:
Hi,
We are working with 2.6.32 kernel. we are working with ALSA model codec driver for conexant chipset. we are using OSS emulation for audio playback and recording.
we are not setting the fragmenttaion block using OSS ioctl function (SNDCTL_DSP_SETFRAGMENT) , assuming that it will be taken care by the ALSA framework based on the sampling rate, bits per sample etc.
we are facing the below issue randomly.
ALSA sound/core/pcm_timer.c:71: -calling VIDIOC_pcm timer resolution out of range (rate = 0, period_size = 1) Division by zero in kernel.
Do your controller really support 1 frame per period (period_size = 1) ?
What is the value of .period_bytes_min and other parameters in snd_pcm_hardware and format supported ?
We tried to program the fragmentation block after the sampling rate, bits per sample etc are configured. it is working fine for 5 or 6 iterations for recording and playback.
after that the audio quality is gone bad. the audio is not smooth and it is sharp.
could you please help to resolve this problem.
Alsa-devel mailing list Alsa-devel@alsa-project.org http://mailman.alsa-project.org/mailman/listinfo/alsa-devel
participants (2)
-
Appalayagari Sreedhar -
Raymond Yau