ALSA project - the C library reference

Functions
pcm_multi.c File Reference

PCM Multi Streams to One Conversion Plugin Interface. More...

## Functions
int | snd_pcm_multi_open (snd_pcm_t **pcmp, const char *name, unsigned int slaves_count, unsigned int master_slave, snd_pcm_t **slaves_pcm, unsigned int *schannels_count, unsigned int channels_count, int *sidxs, unsigned int *schannels, int close_slaves)
| Creates a new Multi PCM. More...
int | _snd_pcm_multi_open (snd_pcm_t **pcmp, const char *name, snd_config_t *root, snd_config_t *conf, snd_pcm_stream_t stream, int mode)
| Creates a new Multi PCM. More...

## Detailed Description

PCM Multi Streams to One Conversion Plugin Interface.

Author
  Abramo Bagnara abram.nosp@m.o@al.nosp@m.sa-pr.nosp@m.ojec.nosp@m.t.org

Date
  2000-2001

## Function Documentation

## ◆ _snd_pcm_multi_open()

int _snd_pcm_multi_open | ( | snd_pcm_t ** | pcmp,
|  | const char * | name,
|  | snd_config_t * | root,
|  | snd_config_t * | conf,
|  | snd_pcm_stream_t | stream,
|  | int | mode
| ) |  |

Creates a new Multi PCM.

Parameters

  pcmp | Returns created PCM handle
  name | Name of PCM
  root | Root configuration node
  conf | Configuration node with Multi PCM description
  stream | Stream type
  mode | Stream mode

Return values

  zero | on success otherwise a negative error code

Warning
  Using of this function might be dangerous in the sense of compatibility reasons. The prototype might be freely changed in future.

## ◆ snd_pcm_multi_open()

int snd_pcm_multi_open | ( | snd_pcm_t ** | pcmp,
|  | const char * | name,
|  | unsigned int | slaves_count,
|  | unsigned int | master_slave,
|  | snd_pcm_t ** | slaves_pcm,
|  | unsigned int * | schannels_count,
|  | unsigned int | channels_count,
|  | int * | sidxs,
|  | unsigned int * | schannels,
|  | int | close_slaves
| ) |  |

Creates a new Multi PCM.

Parameters

  pcmp | Returns created PCM handle
  name | Name of PCM
  slaves_count | Count of slaves
  master_slave | Master slave number
  slaves_pcm | Array with slave PCMs
  schannels_count | Array with slave channel counts
  channels_count | Count of channels
  sidxs | Array with channels indexes to slaves
  schannels | Array with slave channels
  close_slaves | When set, the slave PCM handle is closed

Return values

  zero | on success otherwise a negative error code

Warning
  Using of this function might be dangerous in the sense of compatibility reasons. The prototype might be freely changed in future.