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+/*
+ LUFA Library
+ Copyright (C) Dean Camera, 2009.
+
+ dean [at] fourwalledcubicle [dot] com
+ www.fourwalledcubicle.com
+*/
+
+/*
+ Copyright 2009 Dean Camera (dean [at] fourwalledcubicle [dot] com)
+
+ Permission to use, copy, modify, and distribute this software
+ and its documentation for any purpose and without fee is hereby
+ granted, provided that the above copyright notice appear in all
+ copies and that both that the copyright notice and this
+ permission notice and warranty disclaimer appear in supporting
+ documentation, and that the name of the author not be used in
+ advertising or publicity pertaining to distribution of the
+ software without specific, written prior permission.
+
+ The author disclaim all warranties with regard to this
+ software, including all implied warranties of merchantability
+ and fitness. In no event shall the author be liable for any
+ special, indirect or consequential damages or any damages
+ whatsoever resulting from loss of use, data or profits, whether
+ in an action of contract, negligence or other tortious action,
+ arising out of or in connection with the use or performance of
+ this software.
+*/
+
+/** \file
+ *
+ * Header file for Descriptors.c.
+ */
+
+#ifndef _DESCRIPTORS_H_
+#define _DESCRIPTORS_H_
+
+ /* Includes: */
+ #include <LUFA/Drivers/USB/USB.h>
+
+ #include <avr/pgmspace.h>
+
+ /* Macros: */
+ /** Descriptor header constant to indicate a Audio class interface descriptor. */
+ #define DTYPE_AudioInterface 0x24
+
+ /** Descriptor header constant to indicate a Audio class endpoint descriptor. */
+ #define DTYPE_AudioEndpoint 0x25
+
+ /** Audio class descriptor subtype value for a Audio class specific header descriptor. */
+ #define DSUBTYPE_Header 0x01
+
+ /** Audio class descriptor subtype value for an Output Terminal Audio class specific descriptor. */
+ #define DSUBTYPE_InputTerminal 0x02
+
+ /** Audio class descriptor subtype value for an Input Terminal Audio class specific descriptor. */
+ #define DSUBTYPE_OutputTerminal 0x03
+
+ /** Audio class descriptor subtype value for a Feature Unit Audio class specific descriptor. */
+ #define DSUBTYPE_FeatureUnit 0x06
+
+ /** Audio class descriptor subtype value for a general Audio class specific descriptor. */
+ #define DSUBTYPE_General 0x01
+
+ /** Audio class descriptor subtype value for an Audio class specific descriptor indicating the format of an audio stream. */
+ #define DSUBTYPE_Format 0x02
+
+ //@{
+ /** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
+
+ #define CHANNEL_LEFT_FRONT (1 << 0)
+ #define CHANNEL_RIGHT_FRONT (1 << 1)
+ #define CHANNEL_CENTER_FRONT (1 << 2)
+ #define CHANNEL_LOW_FREQ_ENHANCE (1 << 3)
+ #define CHANNEL_LEFT_SURROUND (1 << 4)
+ #define CHANNEL_RIGHT_SURROUND (1 << 5)
+ #define CHANNEL_LEFT_OF_CENTER (1 << 6)
+ #define CHANNEL_RIGHT_OF_CENTER (1 << 7)
+ #define CHANNEL_SURROUND (1 << 8)
+ #define CHANNEL_SIDE_LEFT (1 << 9)
+ #define CHANNEL_SIDE_RIGHT (1 << 10)
+ #define CHANNEL_TOP (1 << 11)
+ //@}
+
+ //@{
+ /** Supported feature mask for an Audio class feature unit descriptor. See the Audio class specification for more details. */
+
+ #define FEATURE_MUTE (1 << 0)
+ #define FEATURE_VOLUME (1 << 1)
+ #define FEATURE_BASS (1 << 2)
+ #define FEATURE_MID (1 << 3)
+ #define FEATURE_TREBLE (1 << 4)
+ #define FEATURE_GRAPHIC_EQUALIZER (1 << 5)
+ #define FEATURE_AUTOMATIC_GAIN (1 << 6)
+ #define FEATURE_DELAY (1 << 7)
+ #define FEATURE_BASS_BOOST (1 << 8)
+ #define FEATURE_BASS_LOUDNESS (1 << 9)
+ //@}
+
+ //@{
+ /** Terminal type constant for an Audio class terminal descriptor. See the Audio class specification for more details. */
+
+ #define TERMINAL_UNDEFINED 0x0100
+ #define TERMINAL_STREAMING 0x0101
+ #define TERMINAL_VENDOR 0x01FF
+ #define TERMINAL_IN_UNDEFINED 0x0200
+ #define TERMINAL_IN_MIC 0x0201
+ #define TERMINAL_IN_DESKTOP_MIC 0x0202
+ #define TERMINAL_IN_PERSONAL_MIC 0x0203
+ #define TERMINAL_IN_OMNIDIR_MIC 0x0204
+ #define TERMINAL_IN_MIC_ARRAY 0x0205
+ #define TERMINAL_IN_PROCESSING_MIC 0x0206
+ #define TERMINAL_IN_OUT_UNDEFINED 0x0300
+ #define TERMINAL_OUT_SPEAKER 0x0301
+ #define TERMINAL_OUT_HEADPHONES 0x0302
+ #define TERMINAL_OUT_HEAD_MOUNTED 0x0303
+ #define TERMINAL_OUT_DESKTOP 0x0304
+ #define TERMINAL_OUT_ROOM 0x0305
+ #define TERMINAL_OUT_COMMUNICATION 0x0306
+ #define TERMINAL_OUT_LOWFREQ 0x0307
+ //@}
+
+ /** Convenience macro, to fill a 24-bit AudioSampleFreq_t structure with the given sample rate as a 24-bit number.
+ *
+ * \param freq Required audio sampling frequency in HZ
+ */
+ #define SAMPLE_FREQ(freq) {LowWord: ((uint32_t)freq & 0x00FFFF), HighByte: (((uint32_t)freq >> 16) & 0x0000FF)}
+
+ /** Mask for the attributes parameter of an Audio class specific Endpoint descriptor, indicating that the endpoint
+ * accepts only filled endpoint packets of audio samples.
+ */
+ #define EP_ACCEPTS_ONLY_FULL_PACKETS (1 << 7)
+
+ /** Mask for the attributes parameter of an Audio class specific Endpoint descriptor, indicating that the endpoint
+ * will accept partially filled endpoint packets of audio samples.
+ */
+ #define EP_ACCEPTS_SMALL_PACKETS (0 << 7)
+
+ #if defined(USB_FULL_CONTROLLER) || defined(__DOXYGEN__)
+ /** Endpoint number of the Audio isochronous streaming data endpoint. */
+ #define AUDIO_STREAM_EPNUM 1
+ #else
+ #define AUDIO_STREAM_EPNUM 3
+ #endif
+
+ /** Endpoint size in bytes of the Audio isochronous streaming data endpoint. The Windows audio stack requires
+ * at least 192 bytes for correct output, thus the smaller 128 byte maximum endpoint size on some of the smaller
+ * USB AVR models will result in unavoidable distorted output.
+ */
+ #define AUDIO_STREAM_EPSIZE ENDPOINT_MAX_SIZE(AUDIO_STREAM_EPNUM)
+
+ /** Sample frequency of the data being transmitted through the streaming endpoint. */
+ #define AUDIO_SAMPLE_FREQUENCY 48000
+
+ /* Type Defines: */
+ /** Type define for an Audio class specific interface descriptor. This follows a regular interface descriptor to
+ * supply extra information about the audio device's layout to the host. See the USB Audio specification for more
+ * details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint16_t ACSpecification; /**< Binary coded decimal value, indicating the supported Audio Class specification version */
+ uint16_t TotalLength; /**< Total length of the Audio class specific descriptors, including this descriptor */
+
+ uint8_t InCollection; /**< Total number of audio class interfaces within this device */
+ uint8_t InterfaceNumbers[1]; /**< Interface numbers of each audio interface */
+ } USB_AudioInterface_AC_t;
+
+ /** Type define for an Audio class specific Feature Unit descriptor. This indicates to the host what features
+ * are present in the device's audio stream for basic control, such as per-channel volume. See the USB Audio
+ * specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t UnitID; /**< ID value of this feature unit - must be a unique value within the device */
+ uint8_t SourceID; /**< Source ID value of the audio source input into this feature unit */
+
+ uint8_t ControlSize; /**< Size of each element in the ChanelControlls array */
+ uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each seperate audio channel */
+
+ uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device */
+ } USB_AudioFeatureUnit_t;
+
+ /** Type define for an Audio class specific input terminal descriptor. This indicates to the host that the device
+ * contains an input audio source, either from a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device */
+ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask */
+ uint8_t AssociatedOutputTerminal; /**< ID of associated output terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset
+ */
+ uint8_t TotalChannels; /**< Total number of seperate audio channels within this interface (right, left, etc.) */
+ uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal */
+
+ uint8_t ChannelStrIndex; /**< Index of a string descriptor describing this channel within the device */
+ uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device */
+ } USB_AudioInputTerminal_t;
+
+ /** Type define for an Audio class specific output terminal descriptor. This indicates to the host that the device
+ * contains an output audio sink, either to a physical terminal on the device, or a logical terminal (for example,
+ * a USB endpoint). See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t TerminalID; /**< ID value of this terminal unit - must be a unique value within the device */
+ uint16_t TerminalType; /**< Type of terminal, a TERMINAL_* mask */
+ uint8_t AssociatedInputTerminal; /**< ID of associated input terminal, for physically grouped terminals
+ * such as the speaker and microphone of a phone handset
+ */
+ uint8_t SourceID; /**< ID value of the unit this terminal's audio is sourced from */
+
+ uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device */
+ } USB_AudioOutputTerminal_t;
+
+ /** Type define for an Audio class specific streaming interface descriptor. This indicates to the host
+ * how audio streams within the device are formatted. See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t TerminalLink; /**< ID value of the output terminal this descriptor is describing */
+
+ uint8_t FrameDelay; /**< Delay in frames resulting from the complete sample processing from input to output */
+ uint16_t AudioFormat; /**< Format of the audio stream, see Audio Device Formats specification */
+ } USB_AudioInterface_AS_t;
+
+ /** Type define for a 24bit audio sample frequency structure. GCC does not contain a built in 24bit datatype,
+ * this this structure is used to build up the value instead. Fill this structure with the SAMPLE_FREQ() macro.
+ */
+ typedef struct
+ {
+ uint16_t LowWord; /**< Low 16 bits of the 24-bit value */
+ uint8_t HighByte; /**< Upper 8 bits of the 24-bit value */
+ } AudioSampleFreq_t;
+
+ /** Type define for an Audio class specific audio format descriptor. This is used to give the host full details
+ * about the number of channels, the sample resolution, acceptable sample frequencies and encoding method used
+ * in the device's audio streams. See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t FormatType; /**< Format of the audio stream, see Audio Device Formats specification */
+ uint8_t Channels; /**< Total number of discrete channels in the stream */
+
+ uint8_t SubFrameSize; /**< Size in bytes of each channel's sample data in the stream */
+ uint8_t BitResolution; /**< Bits of resolution of each channel's samples in the stream */
+
+ uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device */
+ AudioSampleFreq_t SampleFrequencies[1]; /**< Sample frequencies supported by the device */
+ } USB_AudioFormat_t;
+
+ /** Type define for an Audio class specific endpoint descriptor. This contains a regular endpoint
+ * descriptor with a few Audio-class specific extensions. See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Endpoint_t Endpoint; /**< Standard endpoint descriptor describing the audio endpoint */
+
+ uint8_t Refresh; /**< Always set to zero */
+ uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronisation information to, if needed (zero otherwise) */
+ } USB_AudioStreamEndpoint_Std_t;
+
+ /** Type define for an Audio class specific extended endpoint descriptor. This contains extra information
+ * on the usage of endpoints used to stream audio in and out of the USB Audio device, and follows an Audio
+ * class specific extended endpoint descriptor. See the USB Audio specification for more details.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Header_t Header; /**< Regular descriptor header containing the descriptor's type and length */
+ uint8_t Subtype; /**< Sub type value used to distinguish between audio class specific descriptors */
+
+ uint8_t Attributes; /**< Audio class specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS */
+
+ uint8_t LockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification */
+ uint16_t LockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry */
+ } USB_AudioStreamEndpoint_Spc_t;
+
+ /** Type define for the device configuration descriptor structure. This must be defined in the
+ * application code, as the configuration descriptor contains several sub-descriptors which
+ * vary between devices, and which describe the device's usage to the host.
+ */
+ typedef struct
+ {
+ USB_Descriptor_Configuration_Header_t Config;
+ USB_Descriptor_Interface_t AudioControlInterface;
+ USB_AudioInterface_AC_t AudioControlInterface_SPC;
+ USB_AudioInputTerminal_t InputTerminal;
+ USB_AudioOutputTerminal_t OutputTerminal;
+ USB_Descriptor_Interface_t AudioStreamInterface_Alt0;
+ USB_Descriptor_Interface_t AudioStreamInterface_Alt1;
+ USB_AudioInterface_AS_t AudioStreamInterface_SPC;
+ USB_AudioFormat_t AudioFormat;
+ USB_AudioStreamEndpoint_Std_t AudioEndpoint;
+ USB_AudioStreamEndpoint_Spc_t AudioEndpoint_SPC;
+ } USB_Descriptor_Configuration_t;
+
+ /* Function Prototypes: */
+ uint16_t USB_GetDescriptor(const uint16_t wValue, const uint8_t wIndex, void** const DescriptorAddress)
+ ATTR_WARN_UNUSED_RESULT ATTR_NON_NULL_PTR_ARG(3);
+
+#endif