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usb audio: add descriptors for streaming feature units

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Sebastian Holzapfel 2018-06-20 20:17:15 +10:00 committed by Karl Palsson
parent 572a50a53c
commit dfc67c03dc
1 changed files with 139 additions and 0 deletions
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139
include/libopencm3/usb/audio.h
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@ -8,6 +8,7 @@
@author @htmlonly © @endhtmlonly 2014
Daniel Thompson <daniel@redfelineninja.org.uk>
Seb Holzapfel <schnommus@gmail.com>
@date 19 April 2014
@ -18,6 +19,7 @@ LGPL License Terms @ref lgpl_license
* This file is part of the libopencm3 project.
*
* Copyright (C) 2014 Daniel Thompson <daniel@redfelineninja.org.uk>
* Copyright (C) 2018 Seb Holzapfel <schnommus@gmail.com>
*
* This library is free software: you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
@ -88,6 +90,143 @@ struct usb_audio_header_descriptor_body {
uint8_t baInterfaceNr;
} __attribute__((packed));
/* Table 4-3: Input Terminal Descriptor */
struct usb_audio_input_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bNrChannels;
uint16_t wChannelConfig;
uint8_t iChannelNames;
uint8_t iTerminal;
} __attribute__((packed));
/* Table 4-3: Output Terminal Descriptor */
struct usb_audio_output_terminal_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalID;
uint16_t wTerminalType;
uint8_t bAssocTerminal;
uint8_t bSourceID;
uint8_t iTerminal;
} __attribute__((packed));
/* Table 4-7: Feature Unit Descriptor (head) */
struct usb_audio_feature_unit_descriptor_head {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bUnitID;
uint8_t bSourceID;
uint8_t bControlSize;
uint16_t bmaControlMaster; /* device can assume 16-bit, given highest
* defined bit in spec is bit #9.
* (it is thus required bControlSize=2) */
/* ... */
} __attribute__((packed));
/* Table 4-7: Feature Unit Descriptor (body) */
struct usb_audio_feature_unit_descriptor_body {
/* ... */
uint16_t bmaControl;
/* ... */
} __attribute__((packed));
/* Table 4-7: Feature Unit Descriptor (tail) */
struct usb_audio_feature_unit_descriptor_tail {
/* ... */
uint8_t iFeature;
} __attribute__((packed));
/* Table 4-7: Feature Unit Descriptor (2-channel)
*
* This structure is a convenience covering the (common) case where
* there are 2 channels associated with the feature unit
*/
struct usb_audio_feature_unit_descriptor_2ch {
struct usb_audio_feature_unit_descriptor_head head;
struct usb_audio_feature_unit_descriptor_body channel_control[2];
struct usb_audio_feature_unit_descriptor_tail tail;
} __attribute__((packed));
/* Table 4-19: Class-Specific AS Interface Descriptor */
struct usb_audio_stream_interface_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bTerminalLink;
uint8_t bDelay;
uint16_t wFormatTag;
} __attribute__((packed));
/* Table 4-20: Standard AS Isochronous Audio Data Endpoint Descriptor */
struct usb_audio_stream_endpoint_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bEndpointAddress;
uint8_t bmAttributes;
uint16_t wMaxPacketSize;
uint8_t bInterval;
uint8_t bRefresh;
uint8_t bSynchAddress;
} __attribute__((packed));
/* Table 4-21: Class-Specific AS Isochronous Audio Data Endpoint Descriptor */
struct usb_audio_stream_audio_endpoint_descriptor {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bmAttributes;
uint8_t bLockDelayUnits;
uint16_t wLockDelay;
} __attribute__((packed));
/*
* Definitions from the USB_AUDIO_FORMAT_ or usb_audio_format_ namespace come from:
* "Universal Serial Bus Device Class Definition for Audio Data Formats, Revision 1.0"
*/
/* Table 2-1: Type I Format Type Descriptor (head) */
struct usb_audio_format_type1_descriptor_head {
uint8_t bLength;
uint8_t bDescriptorType;
uint8_t bDescriptorSubtype;
uint8_t bFormatType;
uint8_t bNrChannels;
uint8_t bSubFrameSize;
uint8_t bBitResolution;
uint8_t bSamFreqType;
/* ... */
} __attribute__((packed));
/* Table 2-2: Continuous Sampling Frequency */
struct usb_audio_format_continuous_sampling_frequency {
/* ... */
uint32_t tLowerSamFreq : 24;
uint32_t tUpperSamFreq : 24;
} __attribute__((packed));
/* Table 2-3: Discrete Number of Sampling Frequencies */
struct usb_audio_format_discrete_sampling_frequency {
/* ... */
uint32_t tSamFreq : 24;
} __attribute__((packed));
/* Table 2-1: Type I Format Type Descriptor (1 sampling frequency)
*
* This structure is a convenience covering the (common) case where
* only 1 discrete sampling frequency is used
*/
struct usb_audio_format_type1_descriptor_1freq {
struct usb_audio_format_type1_descriptor_head head;
struct usb_audio_format_discrete_sampling_frequency freqs[1];
} __attribute__((packed));
#endif
/**@}*/