| | Open Sound System |
| Do you have problems with sound/audio application development? Don't panic! Click here for help! |
This header file contains all the declarations required to compile OSS programs. The latest version is always installed together with OSS use of the latest version is strongly recommended.
This header file contains many obsolete definitions (for compatibility with older applications that still ned them). Do not use this file as a reference manual of OSS. Please check the OSS Programmer's guide for descriptions of the supported API details (http://manuals.opensound.com/developer).
#ifndef SOUNDCARD_H #define SOUNDCARD_H
This file is part of Open Sound System.
Copyright (C) 4Front Technologies 1996-2007.
This this source file is released under GPL v2 license (no other versions). See the COPYING file included in the main directory of this source distribution. Please contact sales@opensound.com for further info.
#if defined(__cplusplus) #define EXTERNC extern "C" #else #define EXTERNC extern #endif /* EXTERN_C_WRAPPERS */ #define OSS_VERSION 0x040003 #define SOUND_VERSION OSS_VERSION #define OPEN_SOUND_SYSTEM #if defined(__hpux) && !defined(_HPUX_SOURCE) # error "-D_HPUX_SOURCE must be used when compiling OSS applications" #endif #ifdef __hpux #include <sys/ioctl.h> #endif #ifdef linux /* In Linux we need to be prepared for cross compiling */ #include <linux/ioctl.h> #else # ifdef __FreeBSD__ # include <sys/ioccom.h> # else # include <sys/ioctl.h> # endif #endif #ifndef __SIOWR #if defined(__hpux) || (defined(_IOWR) && (defined(_AIX) || (!defined(sun) && !defined(sparc) && !defined(__INCioctlh) && !defined(__Lynx__))))
Make sure the ioctl macros are compatible with the ones already used by this operating system.
#define SIOCPARM_MASK IOCPARM_MASK #define SIOC_VOID IOC_VOID #define SIOC_OUT IOC_OUT #define SIOC_IN IOC_IN #define SIOC_INOUT IOC_INOUT #define __SIOC_SIZE _IOC_SIZE #define __SIOC_DIR _IOC_DIR #define __SIOC_NONE _IOC_NONE #define __SIOC_READ _IOC_READ #define __SIOC_WRITE _IOC_WRITE #define __SIO _IO #define __SIOR _IOR #define __SIOW _IOW #define __SIOWR _IOWR #else /* #define SIOCTYPE (0xff<<8) */ #define SIOCPARM_MASK 0x1fff /* parameters must be < 8192 bytes */ #define SIOC_VOID 0x00000000 /* no parameters */ #define SIOC_OUT 0x20000000 /* copy out parameters */ #define SIOC_IN 0x40000000 /* copy in parameters */ #define SIOC_INOUT (SIOC_IN|SIOC_OUT) #define __SIO(x,y) ((int)(SIOC_VOID|(x<<8)|y)) #define __SIOR(x,y,t) ((int)(SIOC_OUT|((sizeof(t)&SIOCPARM_MASK)<<16)|(x<<8)|y)) #define __SIOW(x,y,t) ((int)(SIOC_IN|((sizeof(t)&SIOCPARM_MASK)<<16)|(x<<8)|y)) #define __SIOWR(x,y,t) ((int)(SIOC_INOUT|((sizeof(t)&SIOCPARM_MASK)<<16)|(x<<8)|y)) #define __SIOC_SIZE(x) ((x>>16)&SIOCPARM_MASK) #define __SIOC_DIR(x) (x & 0xf0000000) #define __SIOC_NONE SIOC_VOID #define __SIOC_READ SIOC_OUT #define __SIOC_WRITE SIOC_IN # endif /* _IOWR */ #endif /* !__SIOWR */ #define OSS_LONGNAME_SIZE 64 #define OSS_LABEL_SIZE 16 #define OSS_DEVNODE_SIZE 32 typedef char oss_longname_t[OSS_LONGNAME_SIZE]; typedef char oss_label_t[OSS_LABEL_SIZE]; typedef char oss_devnode_t[OSS_DEVNODE_SIZE]; #ifndef DISABLE_SEQUENCER
IOCTL Commands for /dev/sequencer and /dev/music (AKA /dev/sequencer2)
Note that this interface is obsolete and no longer developed. New applications should use /dev/midi instead.
#define SNDCTL_SEQ_RESET __SIO ('Q', 0)
#define SNDCTL_SEQ_SYNC __SIO ('Q', 1)
#define SNDCTL_SYNTH_INFO __SIOWR('Q', 2, struct synth_info)
#define SNDCTL_SEQ_CTRLRATE __SIOWR('Q', 3, int) /* Set/get timer resolution (HZ) */
#define SNDCTL_SEQ_GETOUTCOUNT __SIOR ('Q', 4, int)
#define SNDCTL_SEQ_GETINCOUNT __SIOR ('Q', 5, int)
#define SNDCTL_SEQ_PERCMODE __SIOW ('Q', 6, int)
#define SNDCTL_FM_LOAD_INSTR __SIOW ('Q', 7, struct sbi_instrument) /* Obsolete. Don't use!!!!!! */
#define SNDCTL_SEQ_TESTMIDI __SIOW ('Q', 8, int)
#define SNDCTL_SEQ_RESETSAMPLES __SIOW ('Q', 9, int)
#define SNDCTL_SEQ_NRSYNTHS __SIOR ('Q',10, int)
#define SNDCTL_SEQ_NRMIDIS __SIOR ('Q',11, int)
#define SNDCTL_MIDI_INFO __SIOWR('Q',12, struct midi_info) /* OBSOLETE - use SNDCTL_MIDIINFO instead */
#define SNDCTL_SEQ_THRESHOLD __SIOW ('Q',13, int)
#define SNDCTL_SYNTH_MEMAVL __SIOWR('Q',14, int) /* in=dev#, out=memsize */
#define SNDCTL_FM_4OP_ENABLE __SIOW ('Q',15, int) /* in=dev# */
#define SNDCTL_SEQ_PANIC __SIO ('Q',17)
#define SNDCTL_SEQ_OUTOFBAND __SIOW ('Q',18, struct seq_event_rec)
#define SNDCTL_SEQ_GETTIME __SIOR ('Q',19, int)
#define SNDCTL_SYNTH_ID __SIOWR('Q',20, struct synth_info)
#define SNDCTL_SYNTH_CONTROL __SIOWR('Q',21, struct synth_control)
#define SNDCTL_SYNTH_REMOVESAMPLE __SIOWR('Q',22, struct remove_sample) /* Reserved for future use */
#define SNDCTL_SEQ_TIMING_ENABLE __SIO ('Q', 23) /* Enable incoming MIDI timing messages */
#define SNDCTL_SEQ_ACTSENSE_ENABLE __SIO ('Q', 24) /* Enable incoming active sensing messages */
#define SNDCTL_SEQ_RT_ENABLE __SIO ('Q', 25) /* Enable other incoming realtime messages */
typedef struct synth_control
{
int devno; /* Synthesizer # */
char data[4000]; /* Device spesific command/data record */
} synth_control;
typedef struct remove_sample
{
int devno; /* Synthesizer # */
int bankno; /* MIDI bank # (0=General MIDI) */
int instrno; /* MIDI instrument number */
} remove_sample;
typedef struct seq_event_rec
{
unsigned char arr[8];
} seq_event_rec;
#define SNDCTL_TMR_TIMEBASE __SIOWR('T', 1, int)
#define SNDCTL_TMR_START __SIO ('T', 2)
#define SNDCTL_TMR_STOP __SIO ('T', 3)
#define SNDCTL_TMR_CONTINUE __SIO ('T', 4)
#define SNDCTL_TMR_TEMPO __SIOWR('T', 5, int)
#define SNDCTL_TMR_SOURCE __SIOWR('T', 6, int)
# define TMR_INTERNAL 0x00000001
# define TMR_EXTERNAL 0x00000002
# define TMR_MODE_MIDI 0x00000010
# define TMR_MODE_FSK 0x00000020
# define TMR_MODE_CLS 0x00000040
# define TMR_MODE_SMPTE 0x00000080
#define SNDCTL_TMR_METRONOME __SIOW ('T', 7, int)
#define SNDCTL_TMR_SELECT __SIOW ('T', 8, int)
Sample loading mechanism for internal synthesizers (/dev/sequencer) (for the .PAT format).
struct patch_info
{
unsigned short key; /* Use WAVE_PATCH here */
#define WAVE_PATCH _PATCHKEY(0x04)
#define GUS_PATCH WAVE_PATCH
#define WAVEFRONT_PATCH _PATCHKEY(0x06)
short device_no; /* Synthesizer number */
short instr_no; /* Midi pgm# */
unsigned int mode;
The least significant byte has the same format than the GUS .PAT files
#define WAVE_16_BITS 0x01 /* bit 0 = 8 or 16 bit wave data. */ #define WAVE_UNSIGNED 0x02 /* bit 1 = Signed - Unsigned data. */ #define WAVE_LOOPING 0x04 /* bit 2 = looping enabled-1. */ #define WAVE_BIDIR_LOOP 0x08 /* bit 3 = Set is bidirectional looping. */ #define WAVE_LOOP_BACK 0x10 /* bit 4 = Set is looping backward. */ #define WAVE_SUSTAIN_ON 0x20 /* bit 5 = Turn sustaining on. (Env. pts. 3) */ #define WAVE_ENVELOPES 0x40 /* bit 6 = Enable envelopes - 1 */ #define WAVE_FAST_RELEASE 0x80 /* bit 7 = Shut off immediately after note off */ /* (use the env_rate/env_offs fields). */ /* Linux specific bits */ #define WAVE_VIBRATO 0x00010000 /* The vibrato info is valid */ #define WAVE_TREMOLO 0x00020000 /* The tremolo info is valid */ #define WAVE_SCALE 0x00040000 /* The scaling info is valid */ #define WAVE_FRACTIONS 0x00080000 /* Fraction information is valid */ /* Reserved bits */ #define WAVE_ROM 0x40000000 /* For future use */ #define WAVE_MULAW 0x20000000 /* For future use */ /* Other bits must be zeroed */ int len; /* Size of the wave data in bytes */ int loop_start, loop_end; /* Byte offsets from the beginning */
The base_freq and base_note fields are used when computing the playback speed for a note. The base_note defines the tone frequency which is heard if the sample is played using the base_freq as the playback speed.
The low_note and high_note fields define the minimum and maximum note frequencies for which this sample is valid. It is possible to define more than one samples for an instrument number at the same time. The low_note and high_note fields are used to select the most suitable one.
The fields base_note, high_note and low_note should contain the note frequency multiplied by 1000. For example value for the middle A is 440*1000.
unsigned int base_freq; unsigned int base_note; unsigned int high_note; unsigned int low_note; int panning; /* -128=left, 127=right */ int detuning; /* Envelope. Enabled by mode bit WAVE_ENVELOPES */ unsigned char env_rate[6]; /* GUS HW ramping rate */ unsigned char env_offset[6]; /* 255 == 100% */
The tremolo, vibrato and scale info are not supported yet. Enable by setting the mode bits WAVE_TREMOLO, WAVE_VIBRATO or WAVE_SCALE
unsigned char tremolo_sweep;
unsigned char tremolo_rate;
unsigned char tremolo_depth;
unsigned char vibrato_sweep;
unsigned char vibrato_rate;
unsigned char vibrato_depth;
int scale_frequency;
unsigned int scale_factor; /* from 0 to 2048 or 0 to 2 */
int volume;
int fractions;
int reserved1;
int spare[2];
char data[1]; /* The waveform data starts here */
};
struct sysex_info
{
short key; /* Use SYSEX_PATCH or MAUI_PATCH here */
#define SYSEX_PATCH _PATCHKEY(0x05)
#define MAUI_PATCH _PATCHKEY(0x06)
short device_no; /* Synthesizer number */
int len; /* Size of the sysex data in bytes */
unsigned char data[1]; /* Sysex data starts here */
};
/dev/sequencer input events.
The data written to the /dev/sequencer is a stream of events. Events are records of 4 or 8 bytes. The first byte defines the size. Any number of events can be written with a write call. There is a set of macros for sending these events. Use these macros if you want to maximize portability of your program.
Events SEQ_WAIT, SEQ_MIDIPUTC and SEQ_ECHO. Are also input events. (All input events are currently 4 bytes long. Be prepared to support 8 byte events also. If you receive any event having first byte >= 128, it's a 8 byte event.
The events are documented at the end of this file.
Normal events (4 bytes) There is also a 8 byte version of most of the 4 byte events. The 8 byte one is recommended.
NOTE! All 4 byte events are now obsolete. Applications should not write them. However 4 byte events are still used as inputs from /dev/sequencer (/dev/music uses only 8 byte ones).
#define SEQ_NOTEOFF 0 #define SEQ_FMNOTEOFF SEQ_NOTEOFF /* Just old name */ #define SEQ_NOTEON 1 #define SEQ_FMNOTEON SEQ_NOTEON #define SEQ_WAIT TMR_WAIT_ABS #define SEQ_PGMCHANGE 3 #define SEQ_FMPGMCHANGE SEQ_PGMCHANGE #define SEQ_SYNCTIMER TMR_START #define SEQ_MIDIPUTC 5 #define SEQ_DRUMON 6 /*** OBSOLETE ***/ #define SEQ_DRUMOFF 7 /*** OBSOLETE ***/ #define SEQ_ECHO TMR_ECHO /* For synching programs with output */ #define SEQ_AFTERTOUCH 9 #define SEQ_CONTROLLER 10 #define SEQ_BALANCE 11 #define SEQ_VOLMODE 12
Midi controller numbers *
Controllers 0 to 31 (0x00 to 0x1f) and 32 to 63 (0x20 to 0x3f) are continuous controllers. In the MIDI 1.0 these controllers are sent using two messages. Controller numbers 0 to 31 are used to send the MSB and the controller numbers 32 to 63 are for the LSB. Note that just 7 bits are used in MIDI bytes.
#define CTL_BANK_SELECT 0x00 #define CTL_MODWHEEL 0x01 #define CTL_BREATH 0x02 /* undefined 0x03 */ #define CTL_FOOT 0x04 #define CTL_PORTAMENTO_TIME 0x05 #define CTL_DATA_ENTRY 0x06 #define CTL_MAIN_VOLUME 0x07 #define CTL_BALANCE 0x08 /* undefined 0x09 */ #define CTL_PAN 0x0a #define CTL_EXPRESSION 0x0b /* undefined 0x0c */ /* undefined 0x0d */ /* undefined 0x0e */ /* undefined 0x0f */ #define CTL_GENERAL_PURPOSE1 0x10 #define CTL_GENERAL_PURPOSE2 0x11 #define CTL_GENERAL_PURPOSE3 0x12 #define CTL_GENERAL_PURPOSE4 0x13 /* undefined 0x14 - 0x1f */ /* undefined 0x20 */ /* The controller numbers 0x21 to 0x3f are reserved for the */ /* least significant bytes of the controllers 0x00 to 0x1f. */ /* These controllers are not recognised by the driver. */ /* Controllers 64 to 69 (0x40 to 0x45) are on/off switches. */ /* 0=OFF and 127=ON (intermediate values are possible) */ #define CTL_DAMPER_PEDAL 0x40 #define CTL_SUSTAIN 0x40 /* Alias */ #define CTL_HOLD 0x40 /* Alias */ #define CTL_PORTAMENTO 0x41 #define CTL_SOSTENUTO 0x42 #define CTL_SOFT_PEDAL 0x43 /* undefined 0x44 */ #define CTL_HOLD2 0x45 /* undefined 0x46 - 0x4f */ #define CTL_GENERAL_PURPOSE5 0x50 #define CTL_GENERAL_PURPOSE6 0x51 #define CTL_GENERAL_PURPOSE7 0x52 #define CTL_GENERAL_PURPOSE8 0x53 /* undefined 0x54 - 0x5a */ #define CTL_EXT_EFF_DEPTH 0x5b #define CTL_TREMOLO_DEPTH 0x5c #define CTL_CHORUS_DEPTH 0x5d #define CTL_DETUNE_DEPTH 0x5e #define CTL_CELESTE_DEPTH 0x5e /* Alias for the above one */ #define CTL_PHASER_DEPTH 0x5f #define CTL_DATA_INCREMENT 0x60 #define CTL_DATA_DECREMENT 0x61 #define CTL_NONREG_PARM_NUM_LSB 0x62 #define CTL_NONREG_PARM_NUM_MSB 0x63 #define CTL_REGIST_PARM_NUM_LSB 0x64 #define CTL_REGIST_PARM_NUM_MSB 0x65 /* undefined 0x66 - 0x78 */ /* reserved 0x79 - 0x7f */ /* Pseudo controllers (not midi compatible) */ #define CTRL_PITCH_BENDER 255 #define CTRL_PITCH_BENDER_RANGE 254 #define CTRL_EXPRESSION 253 /* Obsolete */ #define CTRL_MAIN_VOLUME 252 /* Obsolete */
Volume mode defines how volumes are used
#define VOL_METHOD_ADAGIO 1 #define VOL_METHOD_LINEAR 2
Note! SEQ_WAIT, SEQ_MIDIPUTC and SEQ_ECHO are used also as input events.
Event codes 0xf0 to 0xfc are reserved for future extensions.
#define SEQ_FULLSIZE 0xfd /* Long events */
SEQ_FULLSIZE events are used for loading patches/samples to the synthesizer devices. These events are passed directly to the driver of the associated synthesizer device. There is no limit to the size of the extended events. These events are not queued but executed immediately when the write() is called (execution can take several seconds of time).
When a SEQ_FULLSIZE message is written to the device, it must be written using exactly one write() call. Other events cannot be mixed to the same write.
For FM synths (YM3812/OPL3) use struct sbi_instrument and write it to the /dev/sequencer. Don't write other data together with the instrument structure Set the key field of the structure to FM_PATCH. The device field is used to route the patch to the corresponding device.
For wave table use struct patch_info. Initialize the key field to WAVE_PATCH.
#define SEQ_PRIVATE 0xfe /* Low level HW dependent events (8 bytes) */ #define SEQ_EXTENDED 0xff /* Extended events (8 bytes) OBSOLETE */
Record for FM patches
typedef unsigned char sbi_instr_data[32];
struct sbi_instrument
{
unsigned short key; /* FM_PATCH or OPL3_PATCH */
#define FM_PATCH _PATCHKEY(0x01)
#define OPL3_PATCH _PATCHKEY(0x03)
short device; /* Synth# (0-4) */
int channel; /* Program# to be initialized */
sbi_instr_data operators; /* Register settings for operator cells (.SBI format) */
};
struct synth_info
{ /* Read only */
char name[30];
int device; /* 0-N. INITIALIZE BEFORE CALLING */
int synth_type;
#define SYNTH_TYPE_FM 0
#define SYNTH_TYPE_SAMPLE 1
#define SYNTH_TYPE_MIDI 2 /* Midi interface */
int synth_subtype;
#define FM_TYPE_ADLIB 0x00
#define FM_TYPE_OPL3 0x01
#define MIDI_TYPE_MPU401 0x401
#define SAMPLE_TYPE_BASIC 0x10
#define SAMPLE_TYPE_GUS SAMPLE_TYPE_BASIC
#define SAMPLE_TYPE_WAVEFRONT 0x11
int perc_mode; /* No longer supported */
int nr_voices;
int nr_drums; /* Obsolete field */
int instr_bank_size;
unsigned int capabilities;
#define SYNTH_CAP_PERCMODE 0x00000001 /* No longer used */
#define SYNTH_CAP_OPL3 0x00000002 /* Set if OPL3 supported */
#define SYNTH_CAP_INPUT 0x00000004 /* Input (MIDI) device */
int dummies[19]; /* Reserve space */
};
struct sound_timer_info
{
char name[32];
int caps;
};
struct midi_info /* OBSOLETE */
{
char name[30];
int device; /* 0-N. INITIALIZE BEFORE CALLING */
unsigned int capabilities; /* To be defined later */
int dev_type;
int dummies[18]; /* Reserve space */
};
Level 2 event types for /dev/sequencer
The 4 most significant bits of byte 0 specify the class of the event:
0x8X = system level events, 0x9X = device/port specific events, event[1] = device/port, The last 4 bits give the subtype: 0x02 = Channel event (event[3] = chn). 0x01 = note event (event[4] = note). (0x01 is not used alone but always with bit 0x02). event[2] = MIDI message code (0x80=note off etc.)
#define EV_SEQ_LOCAL 0x80 #define EV_TIMING 0x81 #define EV_CHN_COMMON 0x92 #define EV_CHN_VOICE 0x93 #define EV_SYSEX 0x94 #define EV_SYSTEM 0x95 /* MIDI system and real time messages (input only) */
Event types 200 to 220 are reserved for application use. These numbers will not be used by the driver.
Events for event type EV_CHN_VOICE
#define MIDI_NOTEOFF 0x80 #define MIDI_NOTEON 0x90 #define MIDI_KEY_PRESSURE 0xA0
Events for event type EV_CHN_COMMON
#define MIDI_CTL_CHANGE 0xB0 #define MIDI_PGM_CHANGE 0xC0 #define MIDI_CHN_PRESSURE 0xD0 #define MIDI_PITCH_BEND 0xE0 #define MIDI_SYSTEM_PREFIX 0xF0
Timer event types
#define TMR_WAIT_REL 1 /* Time relative to the prev time */ #define TMR_WAIT_ABS 2 /* Absolute time since TMR_START */ #define TMR_STOP 3 #define TMR_START 4 #define TMR_CONTINUE 5 #define TMR_TEMPO 6 #define TMR_ECHO 8 #define TMR_CLOCK 9 /* MIDI clock */ #define TMR_SPP 10 /* Song position pointer */ #define TMR_TIMESIG 11 /* Time signature */
Local event types
#define LOCL_STARTAUDIO 1 #define LOCL_STARTAUDIO2 2 #define LOCL_STARTAUDIO3 3 #define LOCL_STARTAUDIO4 4 #if (!defined(__KERNEL__) && !defined(KERNEL) && !defined(INKERNEL) && !defined(_KERNEL)) || defined(USE_SEQ_MACROS)
Some convenience macros to simplify programming of the /dev/sequencer interface
These macros define the API which should be used when possible.
#define SEQ_DECLAREBUF() SEQ_USE_EXTBUF() void seqbuf_dump (void); /* This function must be provided by programs */ EXTERNC int OSS_init (int seqfd, int buflen); EXTERNC void OSS_seqbuf_dump (int fd, unsigned char *buf, int buflen); EXTERNC void OSS_seq_advbuf (int len, int fd, unsigned char *buf, int buflen); EXTERNC void OSS_seq_needbuf (int len, int fd, unsigned char *buf, int buflen); EXTERNC void OSS_patch_caching (int dev, int chn, int patch, int fd, unsigned char *buf, int buflen); EXTERNC void OSS_drum_caching (int dev, int chn, int patch, int fd, unsigned char *buf, int buflen); EXTERNC void OSS_write_patch (int fd, unsigned char *buf, int len); EXTERNC int OSS_write_patch2 (int fd, unsigned char *buf, int len); #define SEQ_PM_DEFINES int __foo_bar___ #ifdef OSSLIB # define SEQ_USE_EXTBUF() \ EXTERNC unsigned char *_seqbuf; \ EXTERNC int _seqbuflen;EXTERNC int _seqbufptr # define SEQ_DEFINEBUF(len) SEQ_USE_EXTBUF();static int _requested_seqbuflen=len # define _SEQ_ADVBUF(len) OSS_seq_advbuf(len, seqfd, _seqbuf, _seqbuflen) # define _SEQ_NEEDBUF(len) OSS_seq_needbuf(len, seqfd, _seqbuf, _seqbuflen) # define SEQ_DUMPBUF() OSS_seqbuf_dump(seqfd, _seqbuf, _seqbuflen) # define SEQ_LOAD_GMINSTR(dev, instr) \ OSS_patch_caching(dev, -1, instr, seqfd, _seqbuf, _seqbuflen) # define SEQ_LOAD_GMDRUM(dev, drum) \ OSS_drum_caching(dev, -1, drum, seqfd, _seqbuf, _seqbuflen) #else /* !OSSLIB */ # define SEQ_LOAD_GMINSTR(dev, instr) # define SEQ_LOAD_GMDRUM(dev, drum) # define SEQ_USE_EXTBUF() \ EXTERNC unsigned char _seqbuf[]; \ EXTERNC int _seqbuflen;EXTERNC int _seqbufptr #ifndef USE_SIMPLE_MACROS
SEQ_DEFINEBUF (2048); -- Defines a buffer for 2048 bytes
int seqfd; -- The file descriptor for /dev/sequencer.
void seqbuf_dump () { if (_seqbufptr) if (write (seqfd, _seqbuf, _seqbufptr) == -1) { perror ("write /dev/sequencer"); exit (-1); } _seqbufptr = 0; }
#define SEQ_DEFINEBUF(len) \ unsigned char _seqbuf[len]; int _seqbuflen = len;int _seqbufptr = 0 #define _SEQ_NEEDBUF(len) \ if ((_seqbufptr+(len)) > _seqbuflen) seqbuf_dump() #define _SEQ_ADVBUF(len) _seqbufptr += len #define SEQ_DUMPBUF seqbuf_dump #else
This variation of the sequencer macros is used just to format one event using fixed buffer.
The program using the macro library must define the following macros before using this library.
#define _seqbuf name of the buffer (unsigned char[]) #define _SEQ_ADVBUF(len) If the applic needs to know the exact size of the event, this macro can be used. Otherwise this must be defined as empty. #define _seqbufptr Define the name of index variable or 0 if not required.
#define _SEQ_NEEDBUF(len) /* empty */
#endif
#endif /* !OSSLIB */
#define SEQ_VOLUME_MODE(dev, mode) \
{_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr] = SEQ_EXTENDED;\
_seqbuf[_seqbufptr+1] = SEQ_VOLMODE;\
_seqbuf[_seqbufptr+2] = (dev);\
_seqbuf[_seqbufptr+3] = (mode);\
_seqbuf[_seqbufptr+4] = 0;\
_seqbuf[_seqbufptr+5] = 0;\
_seqbuf[_seqbufptr+6] = 0;\
_seqbuf[_seqbufptr+7] = 0;\
_SEQ_ADVBUF(8);}
Midi voice messages
#define _CHN_VOICE(dev, event, chn, note, parm) \
{_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr] = EV_CHN_VOICE;\
_seqbuf[_seqbufptr+1] = (dev);\
_seqbuf[_seqbufptr+2] = (event);\
_seqbuf[_seqbufptr+3] = (chn);\
_seqbuf[_seqbufptr+4] = (note);\
_seqbuf[_seqbufptr+5] = (parm);\
_seqbuf[_seqbufptr+6] = (0);\
_seqbuf[_seqbufptr+7] = 0;\
_SEQ_ADVBUF(8);}
#define SEQ_START_NOTE(dev, chn, note, vol) \
_CHN_VOICE(dev, MIDI_NOTEON, chn, note, vol)
#define SEQ_STOP_NOTE(dev, chn, note, vol) \
_CHN_VOICE(dev, MIDI_NOTEOFF, chn, note, vol)
#define SEQ_KEY_PRESSURE(dev, chn, note, pressure) \
_CHN_VOICE(dev, MIDI_KEY_PRESSURE, chn, note, pressure)
Midi channel messages
#define _CHN_COMMON(dev, event, chn, p1, p2, w14) \
{_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr] = EV_CHN_COMMON;\
_seqbuf[_seqbufptr+1] = (dev);\
_seqbuf[_seqbufptr+2] = (event);\
_seqbuf[_seqbufptr+3] = (chn);\
_seqbuf[_seqbufptr+4] = (p1);\
_seqbuf[_seqbufptr+5] = (p2);\
*(short *)&_seqbuf[_seqbufptr+6] = (w14);\
_SEQ_ADVBUF(8);}
SEQ_SYSEX permits sending of sysex messages. (It may look that it permits sending any MIDI bytes but it's absolutely not possible. Trying to do so _will_ cause problems with MPU401 intelligent mode).
Sysex messages are sent in blocks of 1 to 6 bytes. Longer messages must be sent by calling SEQ_SYSEX() several times (there must be no other events between them). First sysex fragment must have 0xf0 in the first byte and the last byte (buf[len-1] of the last fragment must be 0xf7. No byte between these sysex start and end markers cannot be larger than 0x7f. Also lengths of each fragments (except the last one) must be 6.
Breaking the above rules may work with some MIDI ports but is likely to cause fatal problems with some other devices (such as MPU401).
#define SEQ_SYSEX(dev, buf, len) \
{int ii, ll=(len); \
unsigned char *bufp=buf;\
if (ll>6)ll=6;\
_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr] = EV_SYSEX;\
_seqbuf[_seqbufptr+1] = (dev);\
for(ii=0;ii<ll;ii++)\
_seqbuf[_seqbufptr+ii+2] = bufp[ii];\
for(ii=ll;ii<6;ii++)\
_seqbuf[_seqbufptr+ii+2] = 0xff;\
_SEQ_ADVBUF(8);}
#define SEQ_CHN_PRESSURE(dev, chn, pressure) \
_CHN_COMMON(dev, MIDI_CHN_PRESSURE, chn, pressure, 0, 0)
#define SEQ_SET_PATCH SEQ_PGM_CHANGE
#ifdef OSSLIB
# define SEQ_PGM_CHANGE(dev, chn, patch) \
{OSS_patch_caching(dev, chn, patch, seqfd, _seqbuf, _seqbuflen); \
_CHN_COMMON(dev, MIDI_PGM_CHANGE, chn, patch, 0, 0);}
#else
# define SEQ_PGM_CHANGE(dev, chn, patch) \
_CHN_COMMON(dev, MIDI_PGM_CHANGE, chn, patch, 0, 0)
#endif
#define SEQ_CONTROL(dev, chn, controller, value) \
_CHN_COMMON(dev, MIDI_CTL_CHANGE, chn, controller, 0, value)
#define SEQ_BENDER(dev, chn, value) \
_CHN_COMMON(dev, MIDI_PITCH_BEND, chn, 0, 0, value)
#define SEQ_V2_X_CONTROL(dev, voice, controller, value) \
{_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr] = SEQ_EXTENDED;\
_seqbuf[_seqbufptr+1] = SEQ_CONTROLLER;\
_seqbuf[_seqbufptr+2] = (dev);\
_seqbuf[_seqbufptr+3] = (voice);\
_seqbuf[_seqbufptr+4] = (controller);\
_seqbuf[_seqbufptr+5] = ((value)&0xff);\
_seqbuf[_seqbufptr+6] = ((value>>8)&0xff);\
_seqbuf[_seqbufptr+7] = 0;\
_SEQ_ADVBUF(8);}
The following 5 macros are incorrectly implemented and obsolete. Use SEQ_BENDER and SEQ_CONTROL (with proper controller) instead.
#define SEQ_PITCHBEND(dev, voice, value) \ SEQ_V2_X_CONTROL(dev, voice, CTRL_PITCH_BENDER, value) #define SEQ_BENDER_RANGE(dev, voice, value) \ SEQ_V2_X_CONTROL(dev, voice, CTRL_PITCH_BENDER_RANGE, value) #define SEQ_EXPRESSION(dev, voice, value) \ SEQ_CONTROL(dev, voice, CTL_EXPRESSION, value*128) #define SEQ_MAIN_VOLUME(dev, voice, value) \ SEQ_CONTROL(dev, voice, CTL_MAIN_VOLUME, (value*16383)/100) #define SEQ_PANNING(dev, voice, pos) \ SEQ_CONTROL(dev, voice, CTL_PAN, (pos+128) / 2)
Timing and syncronization macros
#define _TIMER_EVENT(ev, parm) {_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr+0] = EV_TIMING; \
_seqbuf[_seqbufptr+1] = (ev); \
_seqbuf[_seqbufptr+2] = 0;\
_seqbuf[_seqbufptr+3] = 0;\
*(unsigned int *)&_seqbuf[_seqbufptr+4] = (parm); \
_SEQ_ADVBUF(8);}
#define SEQ_START_TIMER() _TIMER_EVENT(TMR_START, 0)
#define SEQ_STOP_TIMER() _TIMER_EVENT(TMR_STOP, 0)
#define SEQ_CONTINUE_TIMER() _TIMER_EVENT(TMR_CONTINUE, 0)
#define SEQ_WAIT_TIME(ticks) _TIMER_EVENT(TMR_WAIT_ABS, ticks)
#define SEQ_DELTA_TIME(ticks) _TIMER_EVENT(TMR_WAIT_REL, ticks)
#define SEQ_ECHO_BACK(key) _TIMER_EVENT(TMR_ECHO, key)
#define SEQ_SET_TEMPO(value) _TIMER_EVENT(TMR_TEMPO, value)
#define SEQ_SONGPOS(pos) _TIMER_EVENT(TMR_SPP, pos)
#define SEQ_TIME_SIGNATURE(sig) _TIMER_EVENT(TMR_TIMESIG, sig)
Local control events
#define _LOCAL_EVENT(ev, parm) {_SEQ_NEEDBUF(8);\
_seqbuf[_seqbufptr+0] = EV_SEQ_LOCAL; \
_seqbuf[_seqbufptr+1] = (ev); \
_seqbuf[_seqbufptr+2] = 0;\
_seqbuf[_seqbufptr+3] = 0;\
*(unsigned int *)&_seqbuf[_seqbufptr+4] = (parm); \
_SEQ_ADVBUF(8);}
#define SEQ_PLAYAUDIO(devmask) _LOCAL_EVENT(LOCL_STARTAUDIO, devmask)
#define SEQ_PLAYAUDIO2(devmask) _LOCAL_EVENT(LOCL_STARTAUDIO2, devmask)
#define SEQ_PLAYAUDIO3(devmask) _LOCAL_EVENT(LOCL_STARTAUDIO3, devmask)
#define SEQ_PLAYAUDIO4(devmask) _LOCAL_EVENT(LOCL_STARTAUDIO4, devmask)
Events for the level 1 interface only
#define SEQ_MIDIOUT(device, byte) {_SEQ_NEEDBUF(4);\
_seqbuf[_seqbufptr] = SEQ_MIDIPUTC;\
_seqbuf[_seqbufptr+1] = (byte);\
_seqbuf[_seqbufptr+2] = (device);\
_seqbuf[_seqbufptr+3] = 0;\
_SEQ_ADVBUF(4);}
Patch loading.
#ifdef OSSLIB
# define SEQ_WRPATCH(patchx, len) \
OSS_write_patch(seqfd, (char*)(patchx), len)
# define SEQ_WRPATCH2(patchx, len) \
OSS_write_patch2(seqfd, (char*)(patchx), len)
#else
# define SEQ_WRPATCH(patchx, len) \
{if (_seqbufptr) SEQ_DUMPBUF();\
if (write(seqfd, (char*)(patchx), len)==-1) \
perror("Write patch: /dev/sequencer");}
# define SEQ_WRPATCH2(patchx, len) \
(SEQ_DUMPBUF(), write(seqfd, (char*)(patchx), len))
#endif
#endif
#endif /* ifndef DISABLE_SEQUENCER */
ioctl commands for the /dev/midi##
#define SNDCTL_MIDI_PRETIME __SIOWR('m', 0, int)
#if 0
The SNDCTL_MIDI_MPUMODE and SNDCTL_MIDI_MPUCMD calls are completely obsolete. The hardware device (MPU-401 "intelligent mode" and compatibles) has disappeared from the market 10 years ago so there is no need for this stuff. The MPU-401 "UART" mode devices don't support this stuff.
typedef struct
{
unsigned char cmd;
char nr_args, nr_returns;
unsigned char data[30];
} mpu_command_rec;
#define SNDCTL_MIDI_MPUMODE __SIOWR('m', 1, int)
#define SNDCTL_MIDI_MPUCMD __SIOWR('m', 2, mpu_command_rec)
#endif
SNDCTL_MIDI_MTCINPUT turns on a mode where OSS automatically inserts MTC quarter frame messages (F1 xx) to the input. The argument is the MTC mode:
-1 = Turn MTC messages OFF (default) 24 = 24 FPS 25 = 25 FPS 29 = 30 FPS drop frame 30 = 30 FPS
Note that 25 FPS mode is probably the only mode that is supported. Other modes may be supported in the future versions of OSS, 25 FPS is handy because it generates 25*4=100 quarter frame messages per second which matches the usual 100 HZ system timer rate).
The quarter frame timer will be reset to 0:00:00:00.0 at the moment this ioctl is made.
#define SNDCTL_MIDI_MTCINPUT __SIOWR('m', 3, int)
MTC/SMPTE time code record (for future use)
typedef struct
{
unsigned char hours, minutes, seconds, frames, qframes;
char direction;
#define MTC_DIR_STOPPED 0
#define MTC_DIR_FORWARD 1
#define MTC_DIR_BACKWARD -1
unsigned char time_code_type;
unsigned int flags;
} oss_mtc_data_t;
#define SNDCTL_MIDI_SETMODE __SIOWR('m', 6, int)
# define MIDI_MODE_TRADITIONAL 0
# define MIDI_MODE_TIMED 1 /* Input times are in MIDI ticks */
# define MIDI_MODE_TIMED_ABS 2 /* Input times are absolute (usecs) */
Packet header for MIDI_MODE_TIMED and MIDI_MODE_TIMED_ABS
typedef unsigned long long oss_midi_time_t; /* Variable type for MIDI time (clock ticks) */
typedef struct
{
int magic; /* Initialize to MIDI_HDR_MAGIC */
#define MIDI_HDR_MAGIC -1
unsigned short event_type;
#define MIDI_EV_WRITE 0 /* Write or read (with payload) */
#define MIDI_EV_TEMPO 1
#define MIDI_EV_ECHO 2
#define MIDI_EV_START 3
#define MIDI_EV_STOP 4
#define MIDI_EV_CONTINUE 5
#define MIDI_EV_XPRESSWRITE 6
#define MIDI_EV_TIMEBASE 7
#define MIDI_EV_DEVCTL 8 /* Device control read/write */
unsigned short options;
#define MIDI_OPT_NONE 0x0000
#define MIDI_OPT_TIMED 0x0001
#define MIDI_OPT_CONTINUATION 0x0002
#define MIDI_OPT_USECTIME 0x0004 /* Time is absolute (in usecs) */
#define MIDI_OPT_BUSY 0x0008 /* Reserved for internal use */
oss_midi_time_t time;
int parm;
int filler[3]; /* Fur future expansion - init to zeros */
} midi_packet_header_t;
MIDI_PAYLOAD_SIZE is the maximum size of one MIDI input chunk. It must be less (or equal) than 1024 which is the read size recommended in the documentation. TODO: Explain this better.
#define MIDI_PAYLOAD_SIZE 1000
typedef struct
{
midi_packet_header_t hdr;
unsigned char payload[MIDI_PAYLOAD_SIZE];
} midi_packet_t;
#define SNDCTL_MIDI_TIMEBASE __SIOWR('m', 7, int)
#define SNDCTL_MIDI_TEMPO __SIOWR('m', 8, int)
User land MIDI servers (synths) can use SNDCTL_MIDI_SET_LATENCY to request MIDI events to be sent to them in advance. The parameter (in microseconds) tells how much before the events are submitted.
This feature is only valid for loopback devices and possibly some other types of virtual devices.
#define SNDCTL_MIDI_SET_LATENCY __SIOW ('m', 9, int)
IOCTL commands for /dev/dsp
#define SNDCTL_DSP_HALT __SIO ('P', 0)
#define SNDCTL_DSP_RESET SNDCTL_DSP_HALT /* Old name */
#define SNDCTL_DSP_SYNC __SIO ('P', 1)
#define SNDCTL_DSP_SPEED __SIOWR('P', 2, int)
/* SNDCTL_DSP_STEREO is obsolete - use SNDCTL_DSP_CHANNELS instead */
#define SNDCTL_DSP_STEREO __SIOWR('P', 3, int)
/* SNDCTL_DSP_STEREO is obsolete - use SNDCTL_DSP_CHANNELS instead */
#define SNDCTL_DSP_GETBLKSIZE __SIOWR('P', 4, int)
#define SNDCTL_DSP_SAMPLESIZE SNDCTL_DSP_SETFMT
#define SNDCTL_DSP_CHANNELS __SIOWR('P', 6, int)
#define SNDCTL_DSP_POST __SIO ('P', 8)
#define SNDCTL_DSP_SUBDIVIDE __SIOWR('P', 9, int)
#define SNDCTL_DSP_SETFRAGMENT __SIOWR('P',10, int)
/* Audio data formats (Note! U8=8 and S16_LE=16 for compatibility) */
#define SNDCTL_DSP_GETFMTS __SIOR ('P',11, int) /* Returns a mask */
#define SNDCTL_DSP_SETFMT __SIOWR('P',5, int) /* Selects ONE fmt */
# define AFMT_QUERY 0x00000000 /* Return current fmt */
# define AFMT_MU_LAW 0x00000001
# define AFMT_A_LAW 0x00000002
# define AFMT_IMA_ADPCM 0x00000004
# define AFMT_U8 0x00000008
# define AFMT_S16_LE 0x00000010 /* Little endian signed 16 */
# define AFMT_S16_BE 0x00000020 /* Big endian signed 16 */
# define AFMT_S8 0x00000040
# define AFMT_U16_LE 0x00000080 /* Little endian U16 */
# define AFMT_U16_BE 0x00000100 /* Big endian U16 */
# define AFMT_MPEG 0x00000200 /* MPEG (2) audio */
/* AC3 _compressed_ bitstreams (See Programmer's Guide for details). */
# define AFMT_AC3 0x00000400
/* Ogg Vorbis _compressed_ bit streams */
# define AFMT_VORBIS 0x00000800
/* 32 bit formats (MSB aligned) formats */
# define AFMT_S32_LE 0x00001000
# define AFMT_S32_BE 0x00002000
/* Reserved for _native_ endian double precision IEEE floating point */
# define AFMT_FLOAT 0x00004000
/* 24 bit formats (LSB aligned in 32 bit word) formats */
# define AFMT_S24_LE 0x00008000
# define AFMT_S24_BE 0x00010000
S/PDIF raw format. In this format the S/PDIF frames (including all control and user bits) are included in the data stream. Each sample is stored in a 32 bit frame (see IEC-958 for more info). This format is supported by very few devices and it's only usable for purposes where full access to the control/user bits is required (real time control).
# define AFMT_SPDIF_RAW 0x00020000 /* 24 bit packed (3 byte) little endian format (USB compatibility) */ # define AFMT_S24_PACKED 0x00040000
Some big endian/little endian handling macros (native endian and opposite endian formats). The usage of these macros is described in the OSS Programmer's Manual.
#if defined(_AIX) || defined(AIX) || defined(sparc) || defined(__hppa) || defined(PPC) || defined(__powerpc__) && !defined(i386) && !defined(__i386) && !defined(__i386__) /* Big endian machines */ # define _PATCHKEY(id) (0xfd00|id) # define AFMT_S16_NE AFMT_S16_BE # define AFMT_U16_NE AFMT_U16_BE # define AFMT_S32_NE AFMT_S32_BE # define AFMT_S24_NE AFMT_S24_BE # define AFMT_S16_OE AFMT_S16_LE # define AFMT_S32_OE AFMT_S32_LE # define AFMT_S24_OE AFMT_S24_LE #else # define _PATCHKEY(id) ((id<<8)|0xfd) # define AFMT_S16_NE AFMT_S16_LE # define AFMT_U16_NE AFMT_U16_LE # define AFMT_S32_NE AFMT_S32_LE # define AFMT_S24_NE AFMT_S24_LE # define AFMT_S16_OE AFMT_S16_BE # define AFMT_S32_OE AFMT_S32_BE # define AFMT_S24_OE AFMT_S24_BE #endif
Buffer status queries.
typedef struct audio_buf_info
{
int fragments; /* # of available fragments (partially usend ones not counted) */
int fragstotal; /* Total # of fragments allocated */
int fragsize; /* Size of a fragment in bytes */
int bytes; /* Available space in bytes (includes partially used fragments) */
/* Note! 'bytes' could be more than fragments*fragsize */
} audio_buf_info;
#define SNDCTL_DSP_GETOSPACE __SIOR ('P',12, audio_buf_info)
#define SNDCTL_DSP_GETISPACE __SIOR ('P',13, audio_buf_info)
#define SNDCTL_DSP_GETCAPS __SIOR ('P',15, int)
# define PCM_CAP_REVISION 0x000000ff /* Bits for revision level (0 to 255) */
# define PCM_CAP_DUPLEX 0x00000100 /* Full duplex record/playback */
# define PCM_CAP_REALTIME 0x00000200 /* Not in use */
# define PCM_CAP_BATCH 0x00000400 /* Device has some kind of */
/* internal buffers which may */
/* cause some delays and */
/* decrease precision of timing */
# define PCM_CAP_COPROC 0x00000800 /* Has a coprocessor */
/* Sometimes it's a DSP */
/* but usually not */
# define PCM_CAP_TRIGGER 0x00001000 /* Supports SETTRIGGER */
# define PCM_CAP_MMAP 0x00002000 /* Supports mmap() */
# define PCM_CAP_MULTI 0x00004000 /* Supports multiple open */
# define PCM_CAP_BIND 0x00008000 /* Supports binding to front/rear/center/lfe */
# define PCM_CAP_INPUT 0x00010000 /* Supports recording */
# define PCM_CAP_OUTPUT 0x00020000 /* Supports playback */
# define PCM_CAP_VIRTUAL 0x00040000 /* Virtual device */
/* 0x00040000 and 0x00080000 reserved for future use */
/* Analog/digital control capabilities */
# define PCM_CAP_ANALOGOUT 0x00100000
# define PCM_CAP_ANALOGIN 0x00200000
# define PCM_CAP_DIGITALOUT 0x00400000
# define PCM_CAP_DIGITALIN 0x00800000
# define PCM_CAP_ADMASK 0x00f00000
NOTE! (capabilities & PCM_CAP_ADMASK)==0 means just that the digital/analog interface control features are not supported by the device/driver. However the device still supports analog, digital or both inputs/outputs (depending on the device). See the OSS Programmer's Guide for full details.
# define PCM_CAP_SHADOW 0x01000000 /* "Shadow" device */
Preferred channel usage. These bits can be used to give recommendations to the application. Used by few drivers. For example if ((caps & DSP_CH_MASK) == DSP_CH_MONO) means that the device works best in mono mode. However it doesn't necessarily mean that the device cannot be used in stereo. These bits should only be used by special applications such as multi track hard disk recorders to find out the initial setup. However the user should be able to override this selection.
To find out which modes are actually supported the application should try to select them using SNDCTL_DSP_CHANNELS.
# define DSP_CH_MASK 0x06000000 /* Mask */ # define DSP_CH_ANY 0x00000000 /* No preferred mode */ # define DSP_CH_MONO 0x02000000 # define DSP_CH_STEREO 0x04000000 # define DSP_CH_MULTI 0x06000000 /* More than two channels */ # define PCM_CAP_HIDDEN 0x08000000 /* Hidden device */ # define PCM_CAP_FREERATE 0x10000000 # define PCM_CAP_MODEM 0x20000000 /* Modem device */ # define PCM_CAP_DEFAULT 0x40000000 /* "Default" device */
The PCM_CAP_* capability names were known as DSP_CAP_* prior OSS 4.0 so it's necessary to define the older names too.
#define DSP_CAP_ADMASK PCM_CAP_ADMASK
#define DSP_CAP_ANALOGIN PCM_CAP_ANALOGIN
#define DSP_CAP_ANALOGOUT PCM_CAP_ANALOGOUT
#define DSP_CAP_BATCH PCM_CAP_BATCH
#define DSP_CAP_BIND PCM_CAP_BIND
#define DSP_CAP_COPROC PCM_CAP_COPROC
#define DSP_CAP_DEFAULT PCM_CAP_DEFAULT
#define DSP_CAP_DIGITALIN PCM_CAP_DIGITALIN
#define DSP_CAP_DIGITALOUT PCM_CAP_DIGITALOUT
#define DSP_CAP_DUPLEX PCM_CAP_DUPLEX
#define DSP_CAP_FREERATE PCM_CAP_FREERATE
#define DSP_CAP_HIDDEN PCM_CAP_HIDDEN
#define DSP_CAP_INPUT PCM_CAP_INPUT
#define DSP_CAP_MMAP PCM_CAP_MMAP
#define DSP_CAP_MODEM PCM_CAP_MODEM
#define DSP_CAP_MULTI PCM_CAP_MULTI
#define DSP_CAP_OUTPUT PCM_CAP_OUTPUT
#define DSP_CAP_REALTIME PCM_CAP_REALTIME
#define DSP_CAP_REVISION PCM_CAP_REVISION
#define DSP_CAP_SHADOW PCM_CAP_SHADOW
#define DSP_CAP_TRIGGER PCM_CAP_TRIGGER
#define DSP_CAP_VIRTUAL PCM_CAP_VIRTUAL
#define SNDCTL_DSP_GETTRIGGER __SIOR ('P',16, int)
#define SNDCTL_DSP_SETTRIGGER __SIOW ('P',16, int)
# define PCM_ENABLE_INPUT 0x00000001
# define PCM_ENABLE_OUTPUT 0x00000002
typedef struct count_info
{
unsigned int bytes; /* Total # of bytes processed */
int blocks; /* # of fragment transitions since last time */
int ptr; /* Current DMA pointer value */
} count_info;
#define SNDCTL_DSP_GETIPTR __SIOR ('P',17, count_info)
#define SNDCTL_DSP_GETOPTR __SIOR ('P',18, count_info)
typedef struct buffmem_desc
{
unsigned *buffer;
int size;
} buffmem_desc;
#define SNDCTL_DSP_SETSYNCRO __SIO ('P', 21)
#define SNDCTL_DSP_SETDUPLEX __SIO ('P', 22)
#define SNDCTL_DSP_PROFILE __SIOW ('P', 23, int) /* OBSOLETE */
#define APF_NORMAL 0 /* Normal applications */
#define APF_NETWORK 1 /* Underruns probably caused by an "external" delay */
#define APF_CPUINTENS 2 /* Underruns probably caused by "overheating" the CPU */
#define SNDCTL_DSP_GETODELAY __SIOR ('P', 23, int)
typedef struct audio_errinfo
{
int play_underruns;
int rec_overruns;
unsigned int play_ptradjust;
unsigned int rec_ptradjust;
int play_errorcount;
int rec_errorcount;
int play_lasterror;
int rec_lasterror;
int play_errorparm;
int rec_errorparm;
int filler[16];
} audio_errinfo;
#define SNDCTL_DSP_GETPLAYVOL __SIOR ('P', 24, int)
#define SNDCTL_DSP_SETPLAYVOL __SIOWR('P', 24, int)
#define SNDCTL_DSP_GETERROR __SIOR ('P', 25, audio_errinfo)
Digital interface (S/PDIF) control interface
typedef struct oss_digital_control
{
unsigned int caps;
#define DIG_CBITIN_NONE 0x00000000
#define DIG_CBITIN_LIMITED 0x00000001
#define DIG_CBITIN_DATA 0x00000002
#define DIG_CBITIN_BYTE0 0x00000004
#define DIG_CBITIN_FULL 0x00000008
#define DIG_CBITIN_MASK 0x0000000f
#define DIG_CBITOUT_NONE 0x00000000
#define DIG_CBITOUT_LIMITED 0x00000010
#define DIG_CBITOUT_BYTE0 0x00000020
#define DIG_CBITOUT_FULL 0x00000040
#define DIG_CBITOUT_DATA 0x00000080
#define DIG_CBITOUT_MASK 0x000000f0
#define DIG_UBITIN 0x00000100
#define DIG_UBITOUT 0x00000200
#define DIG_VBITOUT 0x00000400
#define DIG_OUTRATE 0x00000800
#define DIG_INRATE 0x00001000
#define DIG_INBITS 0x00002000
#define DIG_OUTBITS 0x00004000
#define DIG_EXACT 0x00010000
#define DIG_PRO 0x00020000
#define DIG_CONSUMER 0x00040000
#define DIG_PASSTHROUGH 0x00080000
#define DIG_OUTSEL 0x00100000
unsigned int valid;
#define VAL_CBITIN 0x00000001
#define VAL_UBITIN 0x00000002
#define VAL_CBITOUT 0x00000004
#define VAL_UBITOUT 0x00000008
#define VAL_ISTATUS 0x00000010
#define VAL_IRATE 0x00000020
#define VAL_ORATE 0x00000040
#define VAL_INBITS 0x00000080
#define VAL_OUTBITS 0x00000100
#define VAL_REQUEST 0x00000200
#define VAL_OUTSEL 0x00000400
#define VAL_OUTMASK (VAL_CBITOUT|VAL_UBITOUT|VAL_ORATE|VAL_OUTBITS|VAL_OUTSEL)
unsigned int request, param;
#define SPD_RQ_PASSTHROUGH 1
unsigned char cbitin[24];
unsigned char ubitin[24];
unsigned char cbitout[24];
unsigned char ubitout[24];
unsigned int outsel;
#define OUTSEL_DIGITAL 1
#define OUTSEL_ANALOG 2
#define OUTSEL_BOTH (OUTSEL_DIGITAL|OUTSEL_ANALOG)
int in_data; /* Audio/data if autodetectable by the receiver */
#define IND_UNKNOWN 0
#define IND_AUDIO 1
#define IND_DATA 2
int in_locked; /* Receiver locked */
#define LOCK_NOT_INDICATED 0
#define LOCK_UNLOCKED 1
#define LOCK_LOCKED 2
int in_quality; /* Input signal quality */
#define IN_QUAL_NOT_INDICATED 0
#define IN_QUAL_POOR 1
#define IN_QUAL_GOOD 2
int in_vbit, out_vbit; /* V bits */
#define VBIT_NOT_INDICATED 0
#define VBIT_OFF 1
#define VBIT_ON 2
unsigned int in_errors; /* Various input error conditions */
#define INERR_CRC 0x0001
#define INERR_QCODE_CRC 0x0002
#define INERR_PARITY 0x0004
#define INERR_BIPHASE 0x0008
int srate_in, srate_out;
int bits_in, bits_out;
int filler[32];
} oss_digital_control;
#define SNDCTL_DSP_READCTL __SIOWR('P', 26, oss_digital_control)
#define SNDCTL_DSP_WRITECTL __SIOWR('P', 27, oss_digital_control)
Sync groups for audio devices
typedef struct oss_syncgroup
{
int id;
int mode;
int filler[16];
} oss_syncgroup;
#define SNDCTL_DSP_SYNCGROUP __SIOWR('P', 28, oss_syncgroup)
#define SNDCTL_DSP_SYNCSTART __SIOW ('P', 29, int)
"cooked" mode enables software based conversions for sample rate, sample format (bits) and number of channels (mono/stereo). These conversions are required with some devices that support only one sample rate or just stereo to let the applications to use other formats. The cooked mode is enabled by default. However it's necessary to disable this mode when mmap() is used or when very deterministic timing is required. SNDCTL_DSP_COOKEDMODE is an optional call introduced in OSS 3.9.6f. It's _error return must be ignored_ since normally this call will return erno=EINVAL.
SNDCTL_DSP_COOKEDMODE must be called immediately after open before doing anything else. Otherwise the call will not have any effect.
#define SNDCTL_DSP_COOKEDMODE __SIOW ('P', 30, int)
SNDCTL_DSP_SILENCE and SNDCTL_DSP_SKIP are new calls in OSS 3.99.0 that can be used to implement pause/continue during playback (no effect on recording).
#define SNDCTL_DSP_SILENCE __SIO ('P', 31)
#define SNDCTL_DSP_SKIP __SIO ('P', 32)
Abort transfer (reset) functions for input and output
#define SNDCTL_DSP_HALT_INPUT __SIO ('P', 33)
#define SNDCTL_DSP_RESET_INPUT SNDCTL_DSP_HALT_INPUT /* Old name */
#define SNDCTL_DSP_HALT_OUTPUT __SIO ('P', 34)
#define SNDCTL_DSP_RESET_OUTPUT SNDCTL_DSP_HALT_OUTPUT /* Old name */
Low water level control
#define SNDCTL_DSP_LOW_WATER __SIOW ('P', 34, int)
64 bit pointer support. Only available in environments that support the 64 bit (long long) integer type.
#ifndef OSS_NO_LONG_LONG
typedef struct
{
long long samples;
int fifo_samples;
int filler[32]; /* For future use */
} oss_count_t;
#define SNDCTL_DSP_CURRENT_IPTR __SIOR ('P', 35, oss_count_t)
#define SNDCTL_DSP_CURRENT_OPTR __SIOR ('P', 36, oss_count_t)
#endif
Interface for selecting recording sources and playback output routings.
#define SNDCTL_DSP_GET_RECSRC_NAMES __SIOR ('P', 37, oss_mixer_enuminfo)
#define SNDCTL_DSP_GET_RECSRC __SIOR ('P', 38, int)
#define SNDCTL_DSP_SET_RECSRC __SIOWR('P', 38, int)
#define SNDCTL_DSP_GET_PLAYTGT_NAMES __SIOR ('P', 39, oss_mixer_enuminfo)
#define SNDCTL_DSP_GET_PLAYTGT __SIOR ('P', 40, int)
#define SNDCTL_DSP_SET_PLAYTGT __SIOWR('P', 40, int)
#define SNDCTL_DSP_GETRECVOL __SIOR ('P', 41, int)
#define SNDCTL_DSP_SETRECVOL __SIOWR('P', 41, int)
Some calls for setting the channel assignment with multi channel devices (see the manual for details).
#ifndef OSS_NO_LONG_LONG
#define SNDCTL_DSP_GET_CHNORDER __SIOR ('P', 42, unsigned long long)
#define SNDCTL_DSP_SET_CHNORDER __SIOWR('P', 42, unsigned long long)
# define CHID_UNDEF 0
# define CHID_L 1
# define CHID_R 2
# define CHID_C 3
# define CHID_LFE 4
# define CHID_LS 5
# define CHID_RS 6
# define CHID_LR 7
# define CHID_RR 8
#define CHNORDER_UNDEF 0x0000000000000000ULL
#define CHNORDER_NORMAL 0x0000000087654321ULL
#endif
#define MAX_PEAK_CHANNELS 128
typedef unsigned short oss_peaks_t[MAX_PEAK_CHANNELS];
#define SNDCTL_DSP_GETIPEAKS __SIOR('P', 43, oss_peaks_t)
#define SNDCTL_DSP_GETOPEAKS __SIOR('P', 44, oss_peaks_t)
#define SNDCTL_DSP_POLICY __SIOW('P', 45, int) /* See the manual */
Few ioctl calls that are not official parts of OSS. They have been used by few freeware implementations of OSS.
#define SNDCTL_DSP_GETCHANNELMASK __SIOWR('P', 64, int)
#define SNDCTL_DSP_BIND_CHANNEL __SIOWR('P', 65, int)
# define DSP_BIND_QUERY 0x00000000
# define DSP_BIND_FRONT 0x00000001
# define DSP_BIND_SURR 0x00000002
# define DSP_BIND_CENTER_LFE 0x00000004
# define DSP_BIND_HANDSET 0x00000008
# define DSP_BIND_MIC 0x00000010
# define DSP_BIND_MODEM1 0x00000020
# define DSP_BIND_MODEM2 0x00000040
# define DSP_BIND_I2S 0x00000080
# define DSP_BIND_SPDIF 0x00000100
# define DSP_BIND_REAR 0x00000200
#ifndef NO_LEGACY_MIXER
IOCTL commands for the "legacy " /dev/mixer API (obsolete)
Mixer controls
There can be up to 20 different analog mixer channels. The SOUND_MIXER_NRDEVICES gives the currently supported maximum. The SOUND_MIXER_READ_DEVMASK returns a bitmask which tells the devices supported by the particular mixer.
This "legacy" mixer API is obsolete. It has been superceded by a new one (see below).
#define SOUND_MIXER_NRDEVICES 28 #define SOUND_MIXER_VOLUME 0 #define SOUND_MIXER_BASS 1 #define SOUND_MIXER_TREBLE 2 #define SOUND_MIXER_SYNTH 3 #define SOUND_MIXER_PCM 4 #define SOUND_MIXER_SPEAKER 5 #define SOUND_MIXER_LINE 6 #define SOUND_MIXER_MIC 7 #define SOUND_MIXER_CD 8 #define SOUND_MIXER_IMIX 9 /* Recording monitor */ #define SOUND_MIXER_ALTPCM 10 #define SOUND_MIXER_RECLEV 11 /* Recording level */ #define SOUND_MIXER_IGAIN 12 /* Input gain */ #define SOUND_MIXER_OGAIN 13 /* Output gain */
Some soundcards have three line level inputs (line, aux1 and aux2). Since each card manufacturer has assigned different meanings to these inputs, it's impractical to assign specific meanings (eg line, cd, synth etc.) to them.
#define SOUND_MIXER_LINE1 14 /* Input source 1 (aux1) */ #define SOUND_MIXER_LINE2 15 /* Input source 2 (aux2) */ #define SOUND_MIXER_LINE3 16 /* Input source 3 (line) */ #define SOUND_MIXER_DIGITAL1 17 /* Digital I/O 1 */ #define SOUND_MIXER_DIGITAL2 18 /* Digital I/O 2 */ #define SOUND_MIXER_DIGITAL3 19 /* Digital I/O 3 */ #define SOUND_MIXER_PHONE 20 /* Phone */ #define SOUND_MIXER_MONO 21 /* Mono Output */ #define SOUND_MIXER_VIDEO 22 /* Video/TV (audio) in */ #define SOUND_MIXER_RADIO 23 /* Radio in */ #define SOUND_MIXER_DEPTH 24 /* Surround depth */ #define SOUND_MIXER_REARVOL 25 /* Rear/Surround speaker vol */ #define SOUND_MIXER_CENTERVOL 26 /* Center/LFE speaker vol */ #define SOUND_MIXER_SIDEVOL 27 /* Side-Surround (8speaker) vol */
Warning: SOUND_MIXER_SURRVOL is an old name of SOUND_MIXER_SIDEVOL. They are both assigned to the same mixer control. Don't use both control names in the same program/driver.
#define SOUND_MIXER_SURRVOL SOUND_MIXER_SIDEVOL /* Some on/off settings (SOUND_SPECIAL_MIN - SOUND_SPECIAL_MAX) */ /* Not counted to SOUND_MIXER_NRDEVICES, but use the same number space */ #define SOUND_ONOFF_MIN 28 #define SOUND_ONOFF_MAX 30 /* Note! Number 31 cannot be used since the sign bit is reserved */ #define SOUND_MIXER_NONE 31
The following unsupported macros are no longer functional. Use SOUND_MIXER_PRIVATE# macros in future.
#define SOUND_MIXER_ENHANCE SOUND_MIXER_NONE
#define SOUND_MIXER_MUTE SOUND_MIXER_NONE
#define SOUND_MIXER_LOUD SOUND_MIXER_NONE
#define SOUND_DEVICE_LABELS \
{"Vol ", "Bass ", "Treble", "Synth", "Pcm ", "Speaker ", "Line ", \
"Mic ", "CD ", "Mix ", "Pcm2 ", "Rec ", "IGain", "OGain", \
"Aux1", "Aux2", "Aux3", "Digital1", "Digital2", "Digital3", \
"Phone", "Mono", "Video", "Radio", "Depth", \
"Rear", "Center", "Side"}
#define SOUND_DEVICE_NAMES \
{"vol", "bass", "treble", "synth", "pcm", "speaker", "line", \
"mic", "cd", "mix", "pcm2", "rec", "igain", "ogain", \
"aux1", "aux2", "aux3", "dig1", "dig2", "dig3", \
"phone", "mono", "video", "radio", "depth", \
"rear", "center", "side"}
/* Device bitmask identifiers */
#define SOUND_MIXER_RECSRC 0xff /* Arg contains a bit for each recording source */
#define SOUND_MIXER_DEVMASK 0xfe /* Arg contains a bit for each supported device */
#define SOUND_MIXER_RECMASK 0xfd /* Arg contains a bit for each supported recording source */
#define SOUND_MIXER_CAPS 0xfc
# define SOUND_CAP_EXCL_INPUT 0x00000001 /* Only one recording source at a time */
# define SOUND_CAP_NOLEGACY 0x00000004 /* For internal use only */
# define SOUND_CAP_NORECSRC 0x00000008
#define SOUND_MIXER_STEREODEVS 0xfb /* Mixer channels supporting stereo */
/* OSS/Free ONLY */
#define SOUND_MIXER_OUTSRC 0xfa /* Arg contains a bit for each input source to output */
#define SOUND_MIXER_OUTMASK 0xf9 /* Arg contains a bit for each supported input source to output */
/* OSS/Free ONLY */
/* Device mask bits */
#define SOUND_MASK_VOLUME (1 << SOUND_MIXER_VOLUME)
#define SOUND_MASK_BASS (1 << SOUND_MIXER_BASS)
#define SOUND_MASK_TREBLE (1 << SOUND_MIXER_TREBLE)
#define SOUND_MASK_SYNTH (1 << SOUND_MIXER_SYNTH)
#define SOUND_MASK_PCM (1 << SOUND_MIXER_PCM)
#define SOUND_MASK_SPEAKER (1 << SOUND_MIXER_SPEAKER)
#define SOUND_MASK_LINE (1 << SOUND_MIXER_LINE)
#define SOUND_MASK_MIC (1 << SOUND_MIXER_MIC)
#define SOUND_MASK_CD (1 << SOUND_MIXER_CD)
#define SOUND_MASK_IMIX (1 << SOUND_MIXER_IMIX)
#define SOUND_MASK_ALTPCM (1 << SOUND_MIXER_ALTPCM)
#define SOUND_MASK_RECLEV (1 << SOUND_MIXER_RECLEV)
#define SOUND_MASK_IGAIN (1 << SOUND_MIXER_IGAIN)
#define SOUND_MASK_OGAIN (1 << SOUND_MIXER_OGAIN)
#define SOUND_MASK_LINE1 (1 << SOUND_MIXER_LINE1)
#define SOUND_MASK_LINE2 (1 << SOUND_MIXER_LINE2)
#define SOUND_MASK_LINE3 (1 << SOUND_MIXER_LINE3)
#define SOUND_MASK_DIGITAL1 (1 << SOUND_MIXER_DIGITAL1)
#define SOUND_MASK_DIGITAL2 (1 << SOUND_MIXER_DIGITAL2)
#define SOUND_MASK_DIGITAL3 (1 << SOUND_MIXER_DIGITAL3)
#define SOUND_MASK_MONO (1 << SOUND_MIXER_MONO)
#define SOUND_MASK_PHONE (1 << SOUND_MIXER_PHONE)
#define SOUND_MASK_RADIO (1 << SOUND_MIXER_RADIO)
#define SOUND_MASK_VIDEO (1 << SOUND_MIXER_VIDEO)
#define SOUND_MASK_DEPTH (1 << SOUND_MIXER_DEPTH)
#define SOUND_MASK_REARVOL (1 << SOUND_MIXER_REARVOL)
#define SOUND_MASK_CENTERVOL (1 << SOUND_MIXER_CENTERVOL)
#define SOUND_MASK_SIDEVOL (1 << SOUND_MIXER_SIDEVOL)
/* Note! SOUND_MASK_SURRVOL is alias of SOUND_MASK_SIDEVOL */
#define SOUND_MASK_SURRVOL (1 << SOUND_MIXER_SIDEVOL)
/* Obsolete macros */
#define SOUND_MASK_MUTE (1 << SOUND_MIXER_MUTE)
#define SOUND_MASK_ENHANCE (1 << SOUND_MIXER_ENHANCE)
#define SOUND_MASK_LOUD (1 << SOUND_MIXER_LOUD)
#define MIXER_READ(dev) __SIOR('M', dev, int)
#define SOUND_MIXER_READ_VOLUME MIXER_READ(SOUND_MIXER_VOLUME)
#define SOUND_MIXER_READ_BASS MIXER_READ(SOUND_MIXER_BASS)
#define SOUND_MIXER_READ_TREBLE MIXER_READ(SOUND_MIXER_TREBLE)
#define SOUND_MIXER_READ_SYNTH MIXER_READ(SOUND_MIXER_SYNTH)
#define SOUND_MIXER_READ_PCM MIXER_READ(SOUND_MIXER_PCM)
#define SOUND_MIXER_READ_SPEAKER MIXER_READ(SOUND_MIXER_SPEAKER)
#define SOUND_MIXER_READ_LINE MIXER_READ(SOUND_MIXER_LINE)
#define SOUND_MIXER_READ_MIC MIXER_READ(SOUND_MIXER_MIC)
#define SOUND_MIXER_READ_CD MIXER_READ(SOUND_MIXER_CD)
#define SOUND_MIXER_READ_IMIX MIXER_READ(SOUND_MIXER_IMIX)
#define SOUND_MIXER_READ_ALTPCM MIXER_READ(SOUND_MIXER_ALTPCM)
#define SOUND_MIXER_READ_RECLEV MIXER_READ(SOUND_MIXER_RECLEV)
#define SOUND_MIXER_READ_IGAIN MIXER_READ(SOUND_MIXER_IGAIN)
#define SOUND_MIXER_READ_OGAIN MIXER_READ(SOUND_MIXER_OGAIN)
#define SOUND_MIXER_READ_LINE1 MIXER_READ(SOUND_MIXER_LINE1)
#define SOUND_MIXER_READ_LINE2 MIXER_READ(SOUND_MIXER_LINE2)
#define SOUND_MIXER_READ_LINE3 MIXER_READ(SOUND_MIXER_LINE3)
/* Obsolete macros */
#define SOUND_MIXER_READ_MUTE MIXER_READ(SOUND_MIXER_MUTE)
#define SOUND_MIXER_READ_ENHANCE MIXER_READ(SOUND_MIXER_ENHANCE)
#define SOUND_MIXER_READ_LOUD MIXER_READ(SOUND_MIXER_LOUD)
#define SOUND_MIXER_READ_RECSRC MIXER_READ(SOUND_MIXER_RECSRC)
#define SOUND_MIXER_READ_DEVMASK MIXER_READ(SOUND_MIXER_DEVMASK)
#define SOUND_MIXER_READ_RECMASK MIXER_READ(SOUND_MIXER_RECMASK)
#define SOUND_MIXER_READ_STEREODEVS MIXER_READ(SOUND_MIXER_STEREODEVS)
#define SOUND_MIXER_READ_CAPS MIXER_READ(SOUND_MIXER_CAPS)
#define MIXER_WRITE(dev) __SIOWR('M', dev, int)
#define SOUND_MIXER_WRITE_VOLUME MIXER_WRITE(SOUND_MIXER_VOLUME)
#define SOUND_MIXER_WRITE_BASS MIXER_WRITE(SOUND_MIXER_BASS)
#define SOUND_MIXER_WRITE_TREBLE MIXER_WRITE(SOUND_MIXER_TREBLE)
#define SOUND_MIXER_WRITE_SYNTH MIXER_WRITE(SOUND_MIXER_SYNTH)
#define SOUND_MIXER_WRITE_PCM MIXER_WRITE(SOUND_MIXER_PCM)
#define SOUND_MIXER_WRITE_SPEAKER MIXER_WRITE(SOUND_MIXER_SPEAKER)
#define SOUND_MIXER_WRITE_LINE MIXER_WRITE(SOUND_MIXER_LINE)
#define SOUND_MIXER_WRITE_MIC MIXER_WRITE(SOUND_MIXER_MIC)
#define SOUND_MIXER_WRITE_CD MIXER_WRITE(SOUND_MIXER_CD)
#define SOUND_MIXER_WRITE_IMIX MIXER_WRITE(SOUND_MIXER_IMIX)
#define SOUND_MIXER_WRITE_ALTPCM MIXER_WRITE(SOUND_MIXER_ALTPCM)
#define SOUND_MIXER_WRITE_RECLEV MIXER_WRITE(SOUND_MIXER_RECLEV)
#define SOUND_MIXER_WRITE_IGAIN MIXER_WRITE(SOUND_MIXER_IGAIN)
#define SOUND_MIXER_WRITE_OGAIN MIXER_WRITE(SOUND_MIXER_OGAIN)
#define SOUND_MIXER_WRITE_LINE1 MIXER_WRITE(SOUND_MIXER_LINE1)
#define SOUND_MIXER_WRITE_LINE2 MIXER_WRITE(SOUND_MIXER_LINE2)
#define SOUND_MIXER_WRITE_LINE3 MIXER_WRITE(SOUND_MIXER_LINE3)
/* Obsolete macros */
#define SOUND_MIXER_WRITE_MUTE MIXER_WRITE(SOUND_MIXER_MUTE)
#define SOUND_MIXER_WRITE_ENHANCE MIXER_WRITE(SOUND_MIXER_ENHANCE)
#define SOUND_MIXER_WRITE_LOUD MIXER_WRITE(SOUND_MIXER_LOUD)
#define SOUND_MIXER_WRITE_RECSRC MIXER_WRITE(SOUND_MIXER_RECSRC)
typedef struct mixer_info /* OBSOLETE */
{
char id[16];
char name[32];
int modify_counter;
int card_number;
int port_number;
char handle[32];
} mixer_info;
/* SOUND_MIXER_INFO is obsolete - use SNDCTL_MIXERINFO instead */
#define SOUND_MIXER_INFO __SIOR ('M', 101, mixer_info)
Two ioctls for special souncard function (OSS/Free only)
#define SOUND_MIXER_AGC _SIOWR('M', 103, int)
#define SOUND_MIXER_3DSE _SIOWR('M', 104, int)
The SOUND_MIXER_PRIVATE# commands can be redefined by low level drivers. These features can be used when accessing device specific features.
#define SOUND_MIXER_PRIVATE1 __SIOWR('M', 111, int)
#define SOUND_MIXER_PRIVATE2 __SIOWR('M', 112, int)
#define SOUND_MIXER_PRIVATE3 __SIOWR('M', 113, int)
#define SOUND_MIXER_PRIVATE4 __SIOWR('M', 114, int)
#define SOUND_MIXER_PRIVATE5 __SIOWR('M', 115, int)
/* The following two controls were never implemented and they should not be used. */
#define SOUND_MIXER_READ_MAINVOL __SIOR ('M', 116, int)
#define SOUND_MIXER_WRITE_MAINVOL __SIOWR('M', 116, int)
SOUND_MIXER_GETLEVELS and SOUND_MIXER_SETLEVELS calls can be used for querying current mixer settings from the driver and for loading default volume settings _prior_ activating the mixer (loading doesn't affect current state of the mixer hardware). These calls are for internal use by the driver software only.
typedef struct mixer_vol_table
{
int num; /* Index to volume table */
char name[32];
int levels[32];
} mixer_vol_table;
#define SOUND_MIXER_GETLEVELS __SIOWR('M', 116, mixer_vol_table)
#define SOUND_MIXER_SETLEVELS __SIOWR('M', 117, mixer_vol_table)
#define OSS_GETVERSION __SIOR ('M', 118, int)
Calls to set/get the recording gain for the currently active recording source. These calls automatically map to the right control. Note that these calls are not supported by all drivers. In this case the call will return -1 with errno set to EINVAL
The _MONGAIN work in similar way but set/get the monitoring gain for the currently selected recording source.
#define SOUND_MIXER_READ_RECGAIN __SIOR ('M', 119, int)
#define SOUND_MIXER_WRITE_RECGAIN __SIOWR('M', 119, int)
#define SOUND_MIXER_READ_MONGAIN __SIOR ('M', 120, int)
#define SOUND_MIXER_WRITE_MONGAIN __SIOWR('M', 120, int)
present in any released drivers.
typedef unsigned char oss_reserved_t[512];
#define SOUND_MIXER_RESERVED __SIOWR('M', 121, oss_reserved_t)
#endif /* ifndef NO_LEGACY_MIXER */
The "new" mixer API of OSS 4.0 and later.
This improved mixer API makes it possible to access every possible feature of every possible device. However you should read the mixer programming section of the OSS API Developer's Manual. There is no chance that you could use this interface correctly just by examining this header.
typedef struct oss_sysinfo
{
char product[32]; /* For example OSS/Free, OSS/Linux or OSS/Solaris */
char version[32]; /* For example 4.0a */
int versionnum; /* See OSS_GETVERSION */
char options[128]; /* Reserved */
int numaudios; /* # of audio/dsp devices */
int openedaudio[8]; /* Bit mask telling which audio devices are busy */
int numsynths; /* # of availavle synth devices */
int nummidis; /* # of available MIDI ports */
int numtimers; /* # of available timer devices */
int nummixers; /* # of mixer devices */
int openedmidi[8]; /* Bit mask telling which