I am facing a problem with simultaneous playback and Capture.
I am doing Mic Capture and Playing it back.
this is format i am using SND_PCM_FORMAT_S16_LE. I am recording only one channel "Mono".
this is my driver pcm_hardware configuration
static struct snd_pcm_hardware pcm_hw_info = { .info = SNDRV_PCM_INFO_MMAP | SNDRV_PCM_INFO_MMAP_VALID | SNDRV_PCM_INFO_INTERLEAVED | SNDRV_PCM_INFO_BLOCK_TRANSFER | SNDRV_PCM_INFO_RESUME,
/* * ALSA doesn't support 18-bit or 20-bit packed into 32-bit * words. It also doesn't support 12-bit at all. */ .formats = SNDRV_PCM_FMTBIT_S16_LE,
/* should this be continuous or knot? */ .buffer_bytes_max = 64 * 1024, .period_bytes_min = 1024, .period_bytes_max = 1024, .periods_min = 4, .periods_max = 64, };
I am getting following errors when i do simultaneous capture and playback. Start the while looop
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsaTrying to free free IRQ27 512 256 ReadFromAlsa():State:4, iiLen=2048 ReadFromAlsa():State:2 Overflow state
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsaTrying to free free IRQ27 512 256 ReadFromAlsa():State:4, iiLen=1280 ReadFromAlsa():State:2 Overflow state
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsa 512 256
MY WriteToAlsa 512 256
MY ReadFromAlsaTrying to free free IRQ27 512 256 ReadFromAlsa():State:4, iiLen=1280 ReadFromAlsa():State:2 Overflow state
One read and write handle 256 frames.
Write seems to be OK, but read fails
State 4 is SND_PCM_STATE_XRUN
why this XRUN is happening?
any idea why this is coming?
where i am going wrong?
Thanks