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| Ioctl Requests | audio_support(7I) |
| | audio_support - audio driver support
routines and interface |
SYNOPSIS
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The audio support module supports audio drivers that use the new audio
driver architecture. It also provides a limited number of ioctl(2) functions for application programmers.
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The following data structures are defined to manage the different audio
device types and channels.
Device Types
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The following enumeration lists a number of generic device types.
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typedef enum {
UNDEFINED, AUDIO, AUDIOCTL, USER1, USER2, USER3
} audio_device_type_e;
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Currently, the Solaris audio mixer implements only the AUDIO and AUDIOCTL audio device types. See the mixer(7I) manual page for details. The USER1, USER2 and USER3 device
types allow third parties to write audio personality modules of their own.
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Channel Structure
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This structure is used to get and set state information on individual
channels.
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struct audio_channel {
pid_t pid; /* application's process ID */
uint_t ch_number; /* device channel */
audio_device_type_e dev_type; /* device type */
uint_t info_size; /* size of channel's */
/* info structure */
void *info; /* channel state information */
;
typedef struct audio_channel audio_channel_t;
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The ch_number must specify the specific channel number
to get or set. When the ioctl() returns, the pid contains the process ID of the process that has that channel
open and dev_type will contain the device type. If pid is 0 (zero), then the channel is
not open. The pointer *info must point to a buffer large
enough to hold whatever audio device-related state structure that may be returned.
Currently, only the audio_info_t structure is returned.
See the audio(7I) and mixer(7I)
man pages for more information.
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The audio support driver provides the following ioctls():
-
AUDIO_GET_CH_NUMBER
- This ioctl() returns
the channel number pointed to by the file descriptor. It is returned in the
integer pointer of the ioctl() argument.
-
AUDIO_GET_CH_TYPE
- This ioctl() returns
the type of channel the process has open. It is returned in the audio_device_type_e
enumeration pointer of the ioctl() argument.
-
AUDIO_GET_NUM_CHS
- This ioctl() returns
the number of channels the device supports. It is returned in the integer
pointer of the ioctl() argument.
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The following macro can be used to initialize data structures. The established
convention is that the state corresponding to a field set to -1 will not be
modified.
Where I is a pointer to an info structure and S is the size of that structure.
The following code segment demonstrates how to use this macro:
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audio_info_t info;
AUDIO_INIT(&info, sizeof(info));
info.play.port = AUDIO_HEADPHONE;
err = ioctl(audio_fd, AUDIO_SETINFO, &info);
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-
EINVAL
- The ioctl() is invalid for this file descriptor.
The audio_channel_t structure's info
pointer does not point to a buffer, or the ch_number is
bad.
-
ENOMEM
- The ioctl() failed due to lack of memory.
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-
/usr/share/audio/samples
- Audio sample files
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See attributes(5)
for a description of the following attributes:
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
| Architecture | SPARC, IA |
| Availability | SUNWaudd, SUNWauddx, SUNWaudh |
| Stability Level | Evolving |
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Over time, additional audio personality modules will be added. Audio
application programmers are encouraged to review this man page with each Solaris
release for new audio personality modules.
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| SunOS 5.9 | Go To Top | Last Changed 2 January 2002 |
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