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407 lines
21 KiB
407 lines
21 KiB
/*
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LUFA Library
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Copyright (C) Dean Camera, 2010.
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dean [at] fourwalledcubicle [dot] com
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www.fourwalledcubicle.com
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*/
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/*
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Copyright 2010 Dean Camera (dean [at] fourwalledcubicle [dot] com)
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Permission to use, copy, modify, distribute, and sell this
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software and its documentation for any purpose is hereby granted
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without fee, provided that the above copyright notice appear in
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all copies and that both that the copyright notice and this
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permission notice and warranty disclaimer appear in supporting
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documentation, and that the name of the author not be used in
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advertising or publicity pertaining to distribution of the
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software without specific, written prior permission.
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The author disclaim all warranties with regard to this
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software, including all implied warranties of merchantability
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and fitness. In no event shall the author be liable for any
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special, indirect or consequential damages or any damages
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whatsoever resulting from loss of use, data or profits, whether
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in an action of contract, negligence or other tortious action,
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arising out of or in connection with the use or performance of
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this software.
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*/
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/** \file
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* \brief Common definitions and declarations for the library USB Audio Class driver.
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*
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* Common definitions and declarations for the library USB Audio Class driver.
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*
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* \note This file should not be included directly. It is automatically included as needed by the class driver
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* dispatch header located in LUFA/Drivers/USB/Class/Audio.h.
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*/
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/** \ingroup Group_USBClassAudio
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* @defgroup Group_USBClassAudioCommon Common Class Definitions
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*
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* \section Module Description
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* Constants, Types and Enum definitions that are common to both Device and Host modes for the USB
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* Audio Class.
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*
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* @{
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*/
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#ifndef _AUDIO_CLASS_COMMON_H_
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#define _AUDIO_CLASS_COMMON_H_
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/* Includes: */
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#include "../../USB.h"
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#include <string.h>
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/* Enable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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extern "C" {
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#endif
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/* Preprocessor Checks: */
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#if !defined(__INCLUDE_FROM_AUDIO_DRIVER)
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#error Do not include this file directly. Include LUFA/Drivers/Class/Audio.h instead.
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#endif
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/* Macros: */
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#if !defined(AUDIO_TOTAL_SAMPLE_RATES) || defined(__DOXYGEN__)
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/** Total number of discrete audio sample rates supported by the device. This value can be overridden by defining this
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* token in the project makefile to the desired value, and passing it to the compiler via the -D switch.
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*/
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#define AUDIO_TOTAL_SAMPLE_RATES 1
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#endif
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/** Descriptor header constant to indicate a Audio class interface descriptor. */
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#define DTYPE_AudioInterface 0x24
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/** Descriptor header constant to indicate a Audio class endpoint descriptor. */
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#define DTYPE_AudioEndpoint 0x25
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/** Audio class descriptor subtype value for a Audio class-specific header descriptor. */
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#define DSUBTYPE_Header 0x01
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/** Audio class descriptor subtype value for an Output Terminal Audio class-specific descriptor. */
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#define DSUBTYPE_InputTerminal 0x02
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/** Audio class descriptor subtype value for an Input Terminal Audio class-specific descriptor. */
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#define DSUBTYPE_OutputTerminal 0x03
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/** Audio class descriptor subtype value for a Feature Unit Audio class-specific descriptor. */
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#define DSUBTYPE_FeatureUnit 0x06
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/** Audio class descriptor subtype value for a general Audio class-specific descriptor. */
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#define DSUBTYPE_General 0x01
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/** Audio class descriptor subtype value for an Audio class-specific descriptor indicating the format of an audio stream. */
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#define DSUBTYPE_Format 0x02
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_LEFT_FRONT (1 << 0)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_RIGHT_FRONT (1 << 1)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_CENTER_FRONT (1 << 2)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_LOW_FREQ_ENHANCE (1 << 3)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_LEFT_SURROUND (1 << 4)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_RIGHT_SURROUND (1 << 5)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_LEFT_OF_CENTER (1 << 6)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_RIGHT_OF_CENTER (1 << 7)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_SURROUND (1 << 8)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_SIDE_LEFT (1 << 9)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_SIDE_RIGHT (1 << 10)
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/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define CHANNEL_TOP (1 << 11)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_MUTE (1 << 0)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_VOLUME (1 << 1)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_BASS (1 << 2)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_MID (1 << 3)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_TREBLE (1 << 4)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_GRAPHIC_EQUALIZER (1 << 5)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_AUTOMATIC_GAIN (1 << 6)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_DELAY (1 << 7)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_BASS_BOOST (1 << 8)
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/** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
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#define FEATURE_BASS_LOUDNESS (1 << 9)
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_UNDEFINED 0x0100
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_STREAMING 0x0101
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_VENDOR 0x01FF
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_UNDEFINED 0x0200
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_MIC 0x0201
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_DESKTOP_MIC 0x0202
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_PERSONAL_MIC 0x0203
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_OMNIDIR_MIC 0x0204
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_MIC_ARRAY 0x0205
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_PROCESSING_MIC 0x0206
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_IN_OUT_UNDEFINED 0x0300
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_SPEAKER 0x0301
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_HEADPHONES 0x0302
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_HEAD_MOUNTED 0x0303
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_DESKTOP 0x0304
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_ROOM 0x0305
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_COMMUNICATION 0x0306
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/** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
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#define TERMINAL_OUT_LOWFREQ 0x0307
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/** Convenience macro, to fill a 24-bit AudioSampleFreq_t structure with the given sample rate as a 24-bit number.
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*
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* \param[in] freq Required audio sampling frequency in HZ
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*/
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#define AUDIO_SAMPLE_FREQ(freq) {LowWord: ((uint32_t)freq & 0x00FFFF), HighByte: (((uint32_t)freq >> 16) & 0x0000FF)}
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/** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
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* accepts only filled endpoint packets of audio samples.
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*/
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#define EP_ACCEPTS_ONLY_FULL_PACKETS (1 << 7)
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/** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
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* will accept partially filled endpoint packets of audio samples.
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*/
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#define EP_ACCEPTS_SMALL_PACKETS (0 << 7)
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/* Type Defines: */
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/** \brief Audio class-specific Interface Descriptor.
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*
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* Type define for an Audio class-specific interface descriptor. This follows a regular interface descriptor to
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* supply extra information about the audio device's layout to the host. See the USB Audio specification for more
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* details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint16_t ACSpecification; /**< Binary coded decimal value, indicating the supported Audio Class specification version. */
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uint16_t TotalLength; /**< Total length of the Audio class-specific descriptors, including this descriptor. */
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uint8_t InCollection; /**< Total number of audio class interfaces within this device. */
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uint8_t InterfaceNumbers[1]; /**< Interface numbers of each audio interface. */
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} USB_Audio_Interface_AC_t;
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/** \brief Audio class-specific Feature Unit Descriptor.
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*
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* Type define for an Audio class-specific Feature Unit descriptor. This indicates to the host what features
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* are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
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* specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t UnitID; /**< ID value of this feature unit - must be a unique value within the device. */
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uint8_t SourceID; /**< Source ID value of the audio source input into this feature unit. */
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uint8_t ControlSize; /**< Size of each element in the ChanelControlls array. */
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uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */
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uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
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} USB_Audio_FeatureUnit_t;
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/** \brief Audio class-specific Input Terminal Descriptor.
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*
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* Type define for an Audio class-specific input terminal descriptor. This indicates to the host that the device
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* contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
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* a USB endpoint). See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
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uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */
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uint8_t AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals
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* such as the speaker and microphone of a phone handset.
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*/
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uint8_t TotalChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */
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uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */
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uint8_t ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device. */
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uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
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} USB_Audio_InputTerminal_t;
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/** \brief Audio class-specific Output Terminal Descriptor.
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*
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* Type define for an Audio class-specific output terminal descriptor. This indicates to the host that the device
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* contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
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* a USB endpoint). See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */
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uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask. */
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uint8_t AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals
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* such as the speaker and microphone of a phone handset.
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*/
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uint8_t SourceID; /**< ID value of the unit this terminal's audio is sourced from. */
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uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */
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} USB_Audio_OutputTerminal_t;
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/** \brief Audio class-specific Streaming Audio Interface Descriptor.
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*
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* Type define for an Audio class-specific streaming interface descriptor. This indicates to the host
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* how audio streams within the device are formatted. See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t TerminalLink; /**< ID value of the output terminal this descriptor is describing. */
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uint8_t FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */
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uint16_t AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification. */
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} USB_Audio_Interface_AS_t;
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/** \brief 24-Bit Audio Frequency Structure.
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*
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* Type define for a 24bit audio sample frequency structure. GCC does not contain a built in 24bit datatype,
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* this this structure is used to build up the value instead. Fill this structure with the \ref AUDIO_SAMPLE_FREQ() macro.
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*/
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typedef struct
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{
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uint16_t LowWord; /**< Low 16 bits of the 24-bit value. */
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uint8_t HighByte; /**< Upper 8 bits of the 24-bit value. */
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} USB_Audio_SampleFreq_t;
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/** \brief Audio class-specific Format Descriptor.
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*
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* Type define for an Audio class-specific audio format descriptor. This is used to give the host full details
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* about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used
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* in the device's audio streams. See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t FormatType; /**< Format of the audio stream, see Audio Device Formats specification. */
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uint8_t Channels; /**< Total number of discrete channels in the stream. */
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uint8_t SubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */
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uint8_t BitResolution; /**< Bits of resolution of each channel's samples in the stream. */
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uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device. */
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USB_Audio_SampleFreq_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES]; /**< Sample frequencies supported by the device. */
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} USB_Audio_Format_t;
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/** \brief Audio class-specific Streaming Endpoint Descriptor.
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*
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* Type define for an Audio class-specific endpoint descriptor. This contains a regular endpoint
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* descriptor with a few Audio-class-specific extensions. See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint. */
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uint8_t Refresh; /**< Always set to zero for Audio class devices. */
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uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */
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} USB_Audio_StreamEndpoint_Std_t;
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/** \brief Audio class-specific Extended Endpoint Descriptor.
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*
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* Type define for an Audio class-specific extended endpoint descriptor. This contains extra information
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* on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio
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* class-specific extended endpoint descriptor. See the USB Audio specification for more details.
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*/
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typedef struct
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{
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USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length. */
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uint8_t Subtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */
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uint8_t Attributes; /**< Audio class-specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS. */
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uint8_t LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */
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uint16_t LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */
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} USB_Audio_StreamEndpoint_Spc_t;
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/* Disable C linkage for C++ Compilers: */
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#if defined(__cplusplus)
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}
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#endif
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#endif
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/** @} */
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