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Capability information about a PCM device
typedef struct snd_pcm_info
{
uint32_t type;
uint32_t flags;
uint8_t id[64];
uint8_t name[80];
int32_t playback;
int32_t capture;
int32_t card;
int32_t device;
int32_t shared_card;
int32_t shared_device;
uint8_t reserved[128]; /* must be filled with zeroes */
} snd_pcm_info_t;
The snd_pcm_info_t structure describes the capabilities of
a PCM device.
The members include:
- type
- Sound card type. Deprecated. Do not use.
- flags
- Any combination of:
- SND_PCM_INFO_PLAYBACK — the playback channel is
present.
- SND_PCM_INFO_CAPTURE — the capture channel is
present.
- SND_PCM_INFO_DUPLEX — the hardware is capable
of duplex operation.
- SND_PCM_INFO_DUPLEX_RATE — the playback and capture
rates must be same for the duplex operation.
- SND_PCM_INFO_DUPLEX_MONO — the playback and capture
must be monophonic for the duplex operation.
- SND_PCM_INFO_SHARED — some or all of the hardware
channels are shared using software PCM mixing.
- id[64]
- ID of this PCM device (user selectable).
- name[80]
- Name of the device.
- playback
- Number of playback subdevices - 1.
- capture
- Number of capture subdevices - 1.
- card
- Card number.
- device
- Device number.
- shared_card
- Number of shared cards for this PCM device.
- shared_device
- Number of shared devices for this PCM device.
QNX Neutrino
snd_ctl_pcm_info(),
snd_pcm_info()
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