include/uapi/linux/usb/audio.h
Source file repositories/reference/linux-study-clean/include/uapi/linux/usb/audio.h
File Facts
- System
- Linux kernel
- Corpus path
include/uapi/linux/usb/audio.h- Extension
.h- Size
- 19436 bytes
- Lines
- 639
- 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.
- Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
- Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/types.h
Detected Declarations
struct uac1_ac_header_descriptorstruct uac_input_terminal_descriptorstruct uac1_output_terminal_descriptorstruct uac_mixer_unit_descriptorstruct uac_selector_unit_descriptorstruct uac_feature_unit_descriptorstruct uac_processing_unit_descriptorstruct uac1_as_header_descriptorstruct uac_format_type_i_continuous_descriptorstruct uac_format_type_i_discrete_descriptorstruct uac_format_type_i_ext_descriptorstruct uac_format_type_ii_discrete_descriptorstruct uac_format_type_ii_ext_descriptorstruct uac_iso_endpoint_descriptorstruct uac1_status_wordfunction uac_mixer_unit_bNrChannelsfunction uac_mixer_unit_wChannelConfigfunction uac_mixer_unit_iChannelNamesfunction uac3_mixer_unit_wClusterDescrIDfunction uac_mixer_unit_iMixerfunction uac_selector_unit_iSelectorfunction uac_feature_unit_iFeaturefunction uac_processing_unit_bNrChannelsfunction uac_processing_unit_wChannelConfigfunction uac_processing_unit_iChannelNamesfunction uac_processing_unit_bControlSizefunction uac_processing_unit_iProcessingfunction uac_extension_unit_bControlSizefunction uac_extension_unit_iExtension
Annotated Snippet
struct uac1_ac_header_descriptor {
__u8 bLength; /* 8 + n */
__u8 bDescriptorType; /* USB_DT_CS_INTERFACE */
__u8 bDescriptorSubtype; /* UAC_MS_HEADER */
__le16 bcdADC; /* 0x0100 */
__le16 wTotalLength; /* includes Unit and Terminal desc. */
__u8 bInCollection; /* n */
__u8 baInterfaceNr[]; /* [n] */
} __attribute__ ((packed));
#define UAC_DT_AC_HEADER_SIZE(n) (8 + (n))
/* As above, but more useful for defining your own descriptors: */
#define DECLARE_UAC_AC_HEADER_DESCRIPTOR(n) \
struct uac1_ac_header_descriptor_##n { \
__u8 bLength; \
__u8 bDescriptorType; \
__u8 bDescriptorSubtype; \
__le16 bcdADC; \
__le16 wTotalLength; \
__u8 bInCollection; \
__u8 baInterfaceNr[n]; \
} __attribute__ ((packed))
/* 4.3.2.1 Input Terminal Descriptor */
struct uac_input_terminal_descriptor {
__u8 bLength; /* in bytes: 12 */
__u8 bDescriptorType; /* CS_INTERFACE descriptor type */
__u8 bDescriptorSubtype; /* INPUT_TERMINAL descriptor subtype */
__u8 bTerminalID; /* Constant uniquely terminal ID */
__le16 wTerminalType; /* USB Audio Terminal Types */
__u8 bAssocTerminal; /* ID of the Output Terminal associated */
__u8 bNrChannels; /* Number of logical output channels */
__le16 wChannelConfig;
__u8 iChannelNames;
__u8 iTerminal;
} __attribute__ ((packed));
#define UAC_DT_INPUT_TERMINAL_SIZE 12
/* Terminals - 2.2 Input Terminal Types */
#define UAC_INPUT_TERMINAL_UNDEFINED 0x200
#define UAC_INPUT_TERMINAL_MICROPHONE 0x201
#define UAC_INPUT_TERMINAL_DESKTOP_MICROPHONE 0x202
#define UAC_INPUT_TERMINAL_PERSONAL_MICROPHONE 0x203
#define UAC_INPUT_TERMINAL_OMNI_DIR_MICROPHONE 0x204
#define UAC_INPUT_TERMINAL_MICROPHONE_ARRAY 0x205
#define UAC_INPUT_TERMINAL_PROC_MICROPHONE_ARRAY 0x206
/* Terminals - control selectors */
#define UAC_TERMINAL_CS_COPY_PROTECT_CONTROL 0x01
/* 4.3.2.2 Output Terminal Descriptor */
struct uac1_output_terminal_descriptor {
__u8 bLength; /* in bytes: 9 */
__u8 bDescriptorType; /* CS_INTERFACE descriptor type */
__u8 bDescriptorSubtype; /* OUTPUT_TERMINAL descriptor subtype */
__u8 bTerminalID; /* Constant uniquely terminal ID */
__le16 wTerminalType; /* USB Audio Terminal Types */
__u8 bAssocTerminal; /* ID of the Input Terminal associated */
__u8 bSourceID; /* ID of the connected Unit or Terminal*/
__u8 iTerminal;
} __attribute__ ((packed));
#define UAC_DT_OUTPUT_TERMINAL_SIZE 9
/* Terminals - 2.3 Output Terminal Types */
#define UAC_OUTPUT_TERMINAL_UNDEFINED 0x300
#define UAC_OUTPUT_TERMINAL_SPEAKER 0x301
#define UAC_OUTPUT_TERMINAL_HEADPHONES 0x302
#define UAC_OUTPUT_TERMINAL_HEAD_MOUNTED_DISPLAY_AUDIO 0x303
#define UAC_OUTPUT_TERMINAL_DESKTOP_SPEAKER 0x304
#define UAC_OUTPUT_TERMINAL_ROOM_SPEAKER 0x305
#define UAC_OUTPUT_TERMINAL_COMMUNICATION_SPEAKER 0x306
#define UAC_OUTPUT_TERMINAL_LOW_FREQ_EFFECTS_SPEAKER 0x307
/* Terminals - 2.4 Bi-directional Terminal Types */
#define UAC_BIDIR_TERMINAL_UNDEFINED 0x400
#define UAC_BIDIR_TERMINAL_HANDSET 0x401
#define UAC_BIDIR_TERMINAL_HEADSET 0x402
#define UAC_BIDIR_TERMINAL_SPEAKER_PHONE 0x403
#define UAC_BIDIR_TERMINAL_ECHO_SUPPRESSING 0x404
#define UAC_BIDIR_TERMINAL_ECHO_CANCELING 0x405
/* Set bControlSize = 2 as default setting */
#define UAC_DT_FEATURE_UNIT_SIZE(ch) (7 + ((ch) + 1) * 2)
/* As above, but more useful for defining your own descriptors: */
#define DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(ch) \
Annotation
- Immediate include surface: `linux/types.h`.
- Detected declarations: `struct uac1_ac_header_descriptor`, `struct uac_input_terminal_descriptor`, `struct uac1_output_terminal_descriptor`, `struct uac_mixer_unit_descriptor`, `struct uac_selector_unit_descriptor`, `struct uac_feature_unit_descriptor`, `struct uac_processing_unit_descriptor`, `struct uac1_as_header_descriptor`, `struct uac_format_type_i_continuous_descriptor`, `struct uac_format_type_i_discrete_descriptor`.
- Atlas domain: Core OS / Core Kernel Interface.
- Implementation status: source implementation candidate.
Implementation Notes
- This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
- Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
- Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.