include/uapi/linux/dvb/audio.h

Source file repositories/reference/linux-study-clean/include/uapi/linux/dvb/audio.h

File Facts

System
Linux kernel
Corpus path
include/uapi/linux/dvb/audio.h
Extension
.h
Size
2813 bytes
Lines
87
Domain
Core OS
Bucket
Core Kernel Interface
Inferred role
Core OS: implementation source
Status
source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

Dependency Surface

Detected Declarations

Annotated Snippet

#ifndef _DVBAUDIO_H_
#define _DVBAUDIO_H_

#include <linux/types.h>

typedef enum {
	AUDIO_SOURCE_DEMUX, /* Select the demux as the main source */
	AUDIO_SOURCE_MEMORY /* Select internal memory as the main source */
} audio_stream_source_t;


typedef enum {
	AUDIO_STOPPED,      /* Device is stopped */
	AUDIO_PLAYING,      /* Device is currently playing */
	AUDIO_PAUSED        /* Device is paused */
} audio_play_state_t;


typedef enum {
	AUDIO_STEREO,
	AUDIO_MONO_LEFT,
	AUDIO_MONO_RIGHT,
	AUDIO_MONO,
	AUDIO_STEREO_SWAPPED
} audio_channel_select_t;


typedef struct audio_mixer {
	unsigned int volume_left;
	unsigned int volume_right;
  /* what else do we need? bass, pass-through, ... */
} audio_mixer_t;


typedef struct audio_status {
	int                    AV_sync_state;  /* sync audio and video? */
	int                    mute_state;     /* audio is muted */
	audio_play_state_t     play_state;     /* current playback state */
	audio_stream_source_t  stream_source;  /* current stream source */
	audio_channel_select_t channel_select; /* currently selected channel */
	int                    bypass_mode;    /* pass on audio data to */
	audio_mixer_t	       mixer_state;    /* current mixer state */
} audio_status_t;                              /* separate decoder hardware */


/* for GET_CAPABILITIES and SET_FORMAT, the latter should only set one bit */
#define AUDIO_CAP_DTS    1
#define AUDIO_CAP_LPCM   2
#define AUDIO_CAP_MP1    4
#define AUDIO_CAP_MP2    8
#define AUDIO_CAP_MP3   16
#define AUDIO_CAP_AAC   32
#define AUDIO_CAP_OGG   64
#define AUDIO_CAP_SDDS 128
#define AUDIO_CAP_AC3  256

#define AUDIO_STOP                 _IO('o', 1)
#define AUDIO_PLAY                 _IO('o', 2)
#define AUDIO_PAUSE                _IO('o', 3)
#define AUDIO_CONTINUE             _IO('o', 4)
#define AUDIO_SELECT_SOURCE        _IO('o', 5)
#define AUDIO_SET_MUTE             _IO('o', 6)
#define AUDIO_SET_AV_SYNC          _IO('o', 7)
#define AUDIO_SET_BYPASS_MODE      _IO('o', 8)
#define AUDIO_CHANNEL_SELECT       _IO('o', 9)
#define AUDIO_GET_STATUS           _IOR('o', 10, audio_status_t)

#define AUDIO_GET_CAPABILITIES     _IOR('o', 11, unsigned int)
#define AUDIO_CLEAR_BUFFER         _IO('o',  12)
#define AUDIO_SET_ID               _IO('o', 13)
#define AUDIO_SET_MIXER            _IOW('o', 14, audio_mixer_t)
#define AUDIO_SET_STREAMTYPE       _IO('o', 15)
#define AUDIO_BILINGUAL_CHANNEL_SELECT _IO('o', 20)

#endif /* _DVBAUDIO_H_ */

Annotation

Implementation Notes