235 строки
7.6 KiB
C
235 строки
7.6 KiB
C
/*
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* include/asm-sparc/audioio.h
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*
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* Sparc Audio Midlayer
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* Copyright (C) 1996 Thomas K. Dyas (tdyas@noc.rutgers.edu)
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*/
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#ifndef _AUDIOIO_H_
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#define _AUDIOIO_H_
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/*
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* SunOS/Solaris /dev/audio interface
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*/
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#if defined(__KERNEL__) || !defined(__GLIBC__) || (__GLIBC__ < 2)
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#include <linux/types.h>
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#include <linux/time.h>
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#include <linux/ioctl.h>
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#endif
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/*
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* This structure contains state information for audio device IO streams.
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*/
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typedef struct audio_prinfo {
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/*
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* The following values describe the audio data encoding.
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*/
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unsigned int sample_rate; /* samples per second */
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unsigned int channels; /* number of interleaved channels */
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unsigned int precision; /* bit-width of each sample */
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unsigned int encoding; /* data encoding method */
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/*
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* The following values control audio device configuration
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*/
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unsigned int gain; /* gain level: 0 - 255 */
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unsigned int port; /* selected I/O port (see below) */
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unsigned int avail_ports; /* available I/O ports (see below) */
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unsigned int _xxx[2]; /* Reserved for future use */
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unsigned int buffer_size; /* I/O buffer size */
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/*
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* The following values describe driver state
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*/
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unsigned int samples; /* number of samples converted */
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unsigned int eof; /* End Of File counter (play only) */
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unsigned char pause; /* non-zero for pause, zero to resume */
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unsigned char error; /* non-zero if overflow/underflow */
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unsigned char waiting; /* non-zero if a process wants access */
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unsigned char balance; /* stereo channel balance */
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unsigned short minordev;
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/*
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* The following values are read-only state flags
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*/
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unsigned char open; /* non-zero if open access permitted */
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unsigned char active; /* non-zero if I/O is active */
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} audio_prinfo_t;
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/*
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* This structure describes the current state of the audio device.
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*/
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typedef struct audio_info {
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/*
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* Per-stream information
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*/
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audio_prinfo_t play; /* output status information */
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audio_prinfo_t record; /* input status information */
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/*
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* Per-unit/channel information
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*/
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unsigned int monitor_gain; /* input to output mix: 0 - 255 */
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unsigned char output_muted; /* non-zero if output is muted */
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unsigned char _xxx[3]; /* Reserved for future use */
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unsigned int _yyy[3]; /* Reserved for future use */
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} audio_info_t;
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/*
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* Audio encoding types
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*/
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#define AUDIO_ENCODING_NONE (0) /* no encoding assigned */
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#define AUDIO_ENCODING_ULAW (1) /* u-law encoding */
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#define AUDIO_ENCODING_ALAW (2) /* A-law encoding */
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#define AUDIO_ENCODING_LINEAR (3) /* Linear PCM encoding */
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#define AUDIO_ENCODING_FLOAT (4) /* IEEE float (-1. <-> +1.) */
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#define AUDIO_ENCODING_DVI (104) /* DVI ADPCM */
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#define AUDIO_ENCODING_LINEAR8 (105) /* 8 bit UNSIGNED */
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#define AUDIO_ENCODING_LINEARLE (106) /* Linear PCM LE encoding */
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/*
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* These ranges apply to record, play, and monitor gain values
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*/
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#define AUDIO_MIN_GAIN (0) /* minimum gain value */
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#define AUDIO_MAX_GAIN (255) /* maximum gain value */
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/*
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* These values apply to the balance field to adjust channel gain values
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*/
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#define AUDIO_LEFT_BALANCE (0) /* left channel only */
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#define AUDIO_MID_BALANCE (32) /* equal left/right channel */
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#define AUDIO_RIGHT_BALANCE (64) /* right channel only */
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#define AUDIO_BALANCE_SHIFT (3)
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/*
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* Generic minimum/maximum limits for number of channels, both modes
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*/
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#define AUDIO_MIN_PLAY_CHANNELS (1)
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#define AUDIO_MAX_PLAY_CHANNELS (4)
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#define AUDIO_MIN_REC_CHANNELS (1)
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#define AUDIO_MAX_REC_CHANNELS (4)
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/*
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* Generic minimum/maximum limits for sample precision
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*/
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#define AUDIO_MIN_PLAY_PRECISION (8)
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#define AUDIO_MAX_PLAY_PRECISION (32)
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#define AUDIO_MIN_REC_PRECISION (8)
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#define AUDIO_MAX_REC_PRECISION (32)
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/*
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* Define some convenient names for typical audio ports
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*/
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/*
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* output ports (several may be enabled simultaneously)
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*/
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#define AUDIO_SPEAKER 0x01 /* output to built-in speaker */
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#define AUDIO_HEADPHONE 0x02 /* output to headphone jack */
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#define AUDIO_LINE_OUT 0x04 /* output to line out */
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/*
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* input ports (usually only one at a time)
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*/
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#define AUDIO_MICROPHONE 0x01 /* input from microphone */
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#define AUDIO_LINE_IN 0x02 /* input from line in */
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#define AUDIO_CD 0x04 /* input from on-board CD inputs */
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#define AUDIO_INTERNAL_CD_IN AUDIO_CD /* input from internal CDROM */
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#define AUDIO_ANALOG_LOOPBACK 0x40 /* input from output */
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/*
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* This macro initializes an audio_info structure to 'harmless' values.
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* Note that (~0) might not be a harmless value for a flag that was
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* a signed int.
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*/
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#define AUDIO_INITINFO(i) { \
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unsigned int *__x__; \
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for (__x__ = (unsigned int *)(i); \
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(char *) __x__ < (((char *)(i)) + sizeof (audio_info_t)); \
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*__x__++ = ~0); \
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}
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/*
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* These allow testing for what the user wants to set
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*/
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#define AUD_INITVALUE (~0)
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#define Modify(X) ((unsigned int)(X) != AUD_INITVALUE)
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#define Modifys(X) ((X) != (unsigned short)AUD_INITVALUE)
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#define Modifyc(X) ((X) != (unsigned char)AUD_INITVALUE)
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/*
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* Parameter for the AUDIO_GETDEV ioctl to determine current
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* audio devices.
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*/
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#define MAX_AUDIO_DEV_LEN (16)
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typedef struct audio_device {
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char name[MAX_AUDIO_DEV_LEN];
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char version[MAX_AUDIO_DEV_LEN];
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char config[MAX_AUDIO_DEV_LEN];
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} audio_device_t;
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/*
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* Ioctl calls for the audio device.
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*/
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/*
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* AUDIO_GETINFO retrieves the current state of the audio device.
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*
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* AUDIO_SETINFO copies all fields of the audio_info structure whose
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* values are not set to the initialized value (-1) to the device state.
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* It performs an implicit AUDIO_GETINFO to return the new state of the
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* device. Note that the record.samples and play.samples fields are set
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* to the last value before the AUDIO_SETINFO took effect. This allows
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* an application to reset the counters while atomically retrieving the
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* last value.
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*
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* AUDIO_DRAIN suspends the calling process until the write buffers are
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* empty.
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*
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* AUDIO_GETDEV returns a structure of type audio_device_t which contains
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* three strings. The string "name" is a short identifying string (for
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* example, the SBus Fcode name string), the string "version" identifies
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* the current version of the device, and the "config" string identifies
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* the specific configuration of the audio stream. All fields are
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* device-dependent -- see the device specific manual pages for details.
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*
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* AUDIO_GETDEV_SUNOS returns a number which is an audio device defined
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* herein (making it not too portable)
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*
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* AUDIO_FLUSH stops all playback and recording, clears all queued buffers,
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* resets error counters, and restarts recording and playback as appropriate
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* for the current sampling mode.
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*/
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#define AUDIO_GETINFO _IOR('A', 1, audio_info_t)
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#define AUDIO_SETINFO _IOWR('A', 2, audio_info_t)
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#define AUDIO_DRAIN _IO('A', 3)
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#define AUDIO_GETDEV _IOR('A', 4, audio_device_t)
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#define AUDIO_GETDEV_SUNOS _IOR('A', 4, int)
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#define AUDIO_FLUSH _IO('A', 5)
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/* Define possible audio hardware configurations for
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* old SunOS-style AUDIO_GETDEV ioctl */
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#define AUDIO_DEV_UNKNOWN (0) /* not defined */
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#define AUDIO_DEV_AMD (1) /* audioamd device */
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#define AUDIO_DEV_SPEAKERBOX (2) /* dbri device with speakerbox */
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#define AUDIO_DEV_CODEC (3) /* dbri device (internal speaker) */
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#define AUDIO_DEV_CS4231 (5) /* cs4231 device */
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/*
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* The following ioctl sets the audio device into an internal loopback mode,
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* if the hardware supports this. The argument is TRUE to set loopback,
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* FALSE to reset to normal operation. If the hardware does not support
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* internal loopback, the ioctl should fail with EINVAL.
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* Causes ADC data to be digitally mixed in and sent to the DAC.
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*/
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#define AUDIO_DIAG_LOOPBACK _IOW('A', 101, int)
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#endif /* _AUDIOIO_H_ */
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