ado_pcm_cap_t

Data structure of capabilities of a PCM device

Synopsis:

struct ado_pcm_cap
{
   uint32_t chn_flags;
   uint32_t formats;
   uint32_t rates;
   uint32_t min_rate;
   uint32_t max_rate;
   uint32_t min_voices;
   uint32_t max_voices;
   uint32_t min_fragsize;
   uint32_t max_fragsize;
   uint32_t max_dma_size;
   uint32_t max_frags;
} ado_pcm_cap_t;

Description:

The ado_pcm_cap_t structure describes the capabilities of the playback or capture portion of a PCM device. The members include:

chn_flags

One of the SND_PCM_CHNINFO_* flags. For more information, see snd_pcm_channel_info() in the QNX Audio Developer's Guide.

formats

The formats supported; any combination of the SND_PCM_FMT_* flags. For more information, see snd_pcm_find() in the QNX Audio Developer's Guide.

rates

The sample rate; a combination of:

• SND_PCM_RATE_8000
• SND_PCM_RATE_11025
• SND_PCM_RATE_16000
• SND_PCM_RATE_22050
• SND_PCM_RATE_32000
• SND_PCM_RATE_44100
• SND_PCM_RATE_48000
• SND_PCM_RATE_88200
• SND_PCM_RATE_96000
• SND_PCM_RATE_176400
• SND_PCM_RATE_192000

or one of:

• SND_PCM_RATE_CONTINUOUS — see min_rate and max_rate.
• SND_PCM_RATE_8000_44100 — all the above rates from 8000 through 44100.
• SND_PCM_RATE_8000_48000 — all the above rates from 8000 through 48000.

min_rate

The minimum sample rate if rates is SND_PCM_RATE_CONTINUOUS.

max_rate

The maximum sample rate if rates is SND_PCM_RATE_CONTINUOUS.

min_voices

Minimum number of voices.

max_voices

Maximum number of voices.

min_fragsize

Minimum fragment size for DMA transfer.

max_fragsize

Maximum fragment size for DMA transfer.

max_dma_size

Maximum DMA buffer size. A value of 0 means no limit.

max_frags

Maximum number of fragments. A value of 0 means no limit.

Classification:

QNX Neutrino

See also:

ado_pcm_create()

snd_pcm_channel_info(), snd_pcm_find() in the QNX Audio Developer's Guide