pcm_softvol.c File Reference

PCM Soft Volume Plugin Interface. More...

Defines
#define	MULTI_DIV_short(src, scale)   (((int)(src) * (scale)) >> VOL_SCALE_SHIFT)
#define	CONVERT_AREA(TYPE)
#define	GET_VOL_SCALE
#define	GET_VOL_SCALE
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, int resolution, snd_pcm_t *slave, int close_slave)
	Creates a new SoftVolume PCM.
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.

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Detailed Description

PCM Soft Volume Plugin Interface.

Author:

Takashi Iwai <tiwai@suse.de>

Date:

2004

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Define Documentation

#define GET_VOL_SCALE

Value: switch (ch) { \ case 0: \ case 2: \ vol_scale = (channels == ch + 1) ? vol_c : vol[0]; \ break; \ case 4: \ case 5: \ vol_scale = vol_c; \ break; \ default: \ vol_scale = vol[ch & 1]; \ break; \ }

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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, 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 card  card index of the control min_dB  minimal 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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