pcm.c File Reference

#include <linux/init.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/time.h>
#include <linux/mutex.h>
#include <linux/device.h>
#include <sound/core.h>
#include <sound/minors.h>
#include <sound/pcm.h>
#include <sound/control.h>
#include <sound/info.h>

Go to the source code of this file.

Macros
#define	FORMAT(v)   [SNDRV_PCM_FORMAT_##v] = #v
#define	snd_pcm_proc_init()
#define	snd_pcm_proc_done()

Functions
	MODULE_AUTHOR ("Jaroslav Kysela <[email protected]>, Abramo Bagnara <[email protected]>")
	MODULE_DESCRIPTION ("Midlevel PCM code for ALSA.")
	MODULE_LICENSE ("GPL")
const char *	snd_pcm_format_name (snd_pcm_format_t format)
	EXPORT_SYMBOL_GPL (snd_pcm_format_name)
int	snd_pcm_new_stream (struct snd_pcm *pcm, int stream, int substream_count)
	EXPORT_SYMBOL (snd_pcm_new_stream)
int	snd_pcm_new (struct snd_card *card, const char *id, int device, int playback_count, int capture_count, struct snd_pcm **rpcm)
	EXPORT_SYMBOL (snd_pcm_new)
int	snd_pcm_new_internal (struct snd_card *card, const char *id, int device, int playback_count, int capture_count, struct snd_pcm **rpcm)
	EXPORT_SYMBOL (snd_pcm_new_internal)
int	snd_pcm_attach_substream (struct snd_pcm *pcm, int stream, struct file *file, struct snd_pcm_substream **rsubstream)
void	snd_pcm_detach_substream (struct snd_pcm_substream *substream)
int	snd_pcm_notify (struct snd_pcm_notify *notify, int nfree)
	EXPORT_SYMBOL (snd_pcm_notify)

Macro Definition Documentation

#define FORMAT

(

v

)

[SNDRV_PCM_FORMAT_##v] = #v

Definition at line 167 of file pcm.c.

#define snd_pcm_proc_done

(

)

Definition at line 1200 of file pcm.c.

#define snd_pcm_proc_init

(

)

Definition at line 1199 of file pcm.c.

Function Documentation

EXPORT_SYMBOL

(

snd_pcm_new_stream

)

EXPORT_SYMBOL

(

snd_pcm_new

)

EXPORT_SYMBOL

(

snd_pcm_new_internal

)

EXPORT_SYMBOL

(

snd_pcm_notify

)

EXPORT_SYMBOL_GPL

(

snd_pcm_format_name

)

MODULE_AUTHOR	(	"Jaroslav Kysela <[email protected]>	,
		Abramo Bagnara< abramo @alsa-project.org >"
	)

MODULE_DESCRIPTION

(

"Midlevel PCM code for ALSA."

)

MODULE_LICENSE

(

"GPL"

)

int snd_pcm_attach_substream	(	struct snd_pcm *	pcm,
		int	stream,
		struct file *	file,
		struct snd_pcm_substream **	rsubstream
	)

Definition at line 849 of file pcm.c.

void snd_pcm_detach_substream

(

struct snd_pcm_substream *

substream

)

Definition at line 969 of file pcm.c.

const char* snd_pcm_format_name

(

snd_pcm_format_t

format

)

Definition at line 214 of file pcm.c.

int snd_pcm_new	(	struct snd_card *	card,
		const char *	id,
		int	device,
		int	playback_count,
		int	capture_count,
		struct snd_pcm **	rpcm
	)

snd_pcm_new - create a new PCM instance : the card instance : the id string : the device index (zero based) : the number of substreams for playback : the number of substreams for capture : the pointer to store the new pcm instance

Creates a new PCM instance.

The pcm operators have to be set afterwards to the new instance via snd_pcm_set_ops().

Returns zero if successful, or a negative error code on failure.

Definition at line 764 of file pcm.c.

int snd_pcm_new_internal	(	struct snd_card *	card,
		const char *	id,
		int	device,
		int	playback_count,
		int	capture_count,
		struct snd_pcm **	rpcm
	)

snd_pcm_new_internal - create a new internal PCM instance : the card instance : the id string : the device index (zero based - shared with normal PCMs) : the number of substreams for playback : the number of substreams for capture : the pointer to store the new pcm instance

Creates a new internal PCM instance with no userspace device or procfs entries. This is used by ASoC Back End PCMs in order to create a PCM that will only be used internally by kernel drivers. i.e. it cannot be opened by userspace. It provides existing ASoC components drivers with a substream and access to any private data.

The pcm operators have to be set afterwards to the new instance via snd_pcm_set_ops().

Returns zero if successful, or a negative error code on failure.

Definition at line 792 of file pcm.c.

int snd_pcm_new_stream	(	struct snd_pcm *	pcm,
		int	stream,
		int	substream_count
	)

snd_pcm_new_stream - create a new PCM stream : the pcm instance : the stream direction, SNDRV_PCM_STREAM_XXX : the number of substreams

Creates a new stream for the pcm. The corresponding stream on the pcm must have been empty before calling this, i.e. zero must be given to the argument of snd_pcm_new().

Returns zero if successful, or a negative error code on failure.

Definition at line 642 of file pcm.c.

int snd_pcm_notify	(	struct snd_pcm_notify *	notify,
		int	nfree
	)

Definition at line 1127 of file pcm.c.