# /builddir/build/BUILD/alsa-lib-1.1.0/src/pcm/pcm_softvol.c File Reference

PCM Soft Volume Plugin Interface. More...

## Functions

int | snd_pcm_softvol_open (snd_pcm_t **pcmp, const char *name, snd_pcm_format_t sformat, int ctl_card, snd_ctl_elem_id_t *ctl_id, int cchannels, double min_dB, double max_dB, int resolution, snd_pcm_t *slave, int close_slave)
| Creates a new SoftVolume PCM.
int | snd_pcm_parse_control_id (snd_config_t *conf, snd_ctl_elem_id_t *ctl_id, int *cardp, int *cchannelsp, int *hwctlp)
| Parse control element id from the config.
int | _snd_pcm_softvol_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 Soft Volume PCM.

## Detailed Description

PCM Soft Volume Plugin Interface.

Author:
  Takashi Iwai <tiwai@suse.de>

Date:
  2004

## Function Documentation

int _snd_pcm_softvol_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 Soft Volume PCM.

Parameters:

  | pcmp | Returns created PCM handle
  | name | Name of PCM
  | root | Root configuration node
  | conf | Configuration node with Soft Volume 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_softvol_open | ( | snd_pcm_t ** | pcmp,
|  | const char * | name,
|  | snd_pcm_format_t | sformat,
|  | int | ctl_card,
|  | snd_ctl_elem_id_t * | ctl_id,
|  | int | cchannels,
|  | double | min_dB,
|  | double | max_dB,
|  | int | resolution,
|  | snd_pcm_t * | slave,
|  | int | close_slave |
| ) |  |  |

Creates a new SoftVolume PCM.

Parameters:

  | pcmp | Returns created PCM handle
  | name | Name of PCM
  | sformat | Slave format
  | ctl_card | card index of the control
  | ctl_id | The control element
  | cchannels | PCM channels
  | min_dB | minimal dB value
  | max_dB | maximal dB value
  | resolution | resolution of control
  | slave | Slave PCM handle
  | close_slave | When set, the slave PCM handle is closed with copy PCM

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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