# /builddir/build/BUILD/alsa-lib-1.1.0/src/pcm/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.
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.

## Detailed Description

PCM Multi Streams to One Conversion Plugin Interface.

Author:
  Abramo Bagnara <abramo@alsa-project.org>

Date:
  2000-2001

## Function Documentation

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.

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.

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