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author | Dean Camera <dean@fourwalledcubicle.com> | 2010-09-09 13:05:57 +0000 |
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committer | Dean Camera <dean@fourwalledcubicle.com> | 2010-09-09 13:05:57 +0000 |
commit | c166dfc64ea10903a43a429709a92dc7ef9ee9dc (patch) | |
tree | 94cd423adcc362137d3f1e178f29d5db0f537122 /LUFA/Drivers/USB/Class/Common/Audio.h | |
parent | 66f14d44a3c3f1744e85cea14061b568c3c1306c (diff) | |
download | lufa-c166dfc64ea10903a43a429709a92dc7ef9ee9dc.tar.gz lufa-c166dfc64ea10903a43a429709a92dc7ef9ee9dc.tar.bz2 lufa-c166dfc64ea10903a43a429709a92dc7ef9ee9dc.zip |
Added class specific descriptor type defines with standard USB-IF element naming.
Diffstat (limited to 'LUFA/Drivers/USB/Class/Common/Audio.h')
-rw-r--r-- | LUFA/Drivers/USB/Class/Common/Audio.h | 350 |
1 files changed, 290 insertions, 60 deletions
diff --git a/LUFA/Drivers/USB/Class/Common/Audio.h b/LUFA/Drivers/USB/Class/Common/Audio.h index 99bdb3659..ec7f148a7 100644 --- a/LUFA/Drivers/USB/Class/Common/Audio.h +++ b/LUFA/Drivers/USB/Class/Common/Audio.h @@ -236,103 +236,244 @@ #define EP_ACCEPTS_SMALL_PACKETS (0 << 7) /* Type Defines: */ - /** \brief Audio class-specific Interface Descriptor. + /** \brief Audio class-specific Interface Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_Interface_AC_t for the version of this type with standard element names. */ 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. */ + 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_Audio_Descriptor_Interface_AC_t; + + /** \brief Audio class-specific Interface Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_Interface_AC_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ - 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 bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + + uint16_t bcdADC; /**< Binary coded decimal value, indicating the supported Audio Class specification version. */ + uint16_t wTotalLength; /**< 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_Audio_Interface_AC_t; + uint8_t bInCollection; /**< Total number of audio class interfaces within this device. */ + uint8_t bInterfaceNumbers[1]; /**< Interface numbers of each audio interface. */ + } USB_Audio_StdDescriptor_Interface_AC_t; - /** \brief Audio class-specific Feature Unit Descriptor. + /** \brief Audio class-specific Feature Unit Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_FeatureUnit_t for the version of this type with standard element names. */ 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. */ + 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 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 separate audio channel. */ + uint8_t ControlSize; /**< Size of each element in the ChanelControlls array. */ + uint8_t ChannelControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */ - uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */ - } USB_Audio_FeatureUnit_t; + uint8_t FeatureUnitStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */ + } USB_Audio_Descriptor_FeatureUnit_t; - /** \brief Audio class-specific Input Terminal Descriptor. + /** \brief Audio class-specific Feature Unit Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_FeatureUnit_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ + + uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + + uint8_t bUnitID; /**< ID value of this feature unit - must be a unique value within the device. */ + uint8_t bSourceID; /**< Source ID value of the audio source input into this feature unit. */ + + uint8_t bControlSize; /**< Size of each element in the ChanelControlls array. */ + uint8_t bmaControls[3]; /**< Feature masks for the control channel, and each separate audio channel. */ + + uint8_t iFeature; /**< Index of a string descriptor describing this descriptor within the device. */ + } USB_Audio_StdDescriptor_FeatureUnit_t; + + /** \brief Audio class-specific Input Terminal Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_InputTerminal_t for the version of this type with standard element names. */ 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. */ + 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 + 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 separate audio channels within this interface (right, left, etc.) */ - uint16_t ChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */ + uint8_t TotalChannels; /**< Total number of separate 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_Audio_InputTerminal_t; + 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_Audio_Descriptor_InputTerminal_t; - /** \brief Audio class-specific Output Terminal Descriptor. + /** \brief Audio class-specific Input Terminal Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_InputTerminal_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ + + uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + uint8_t bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */ + uint16_t wTerminalType; /**< Type of terminal, a TERMINAL_* mask. */ + uint8_t bAssocTerminal; /**< ID of associated output terminal, for physically grouped terminals + * such as the speaker and microphone of a phone handset. + */ + uint8_t bNrChannels; /**< Total number of separate audio channels within this interface (right, left, etc.) */ + uint16_t wChannelConfig; /**< CHANNEL_* masks indicating what channel layout is supported by this terminal. */ + + uint8_t iChannelNames; /**< Index of a string descriptor describing this channel within the device. */ + uint8_t iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */ + } USB_Audio_StdDescriptor_InputTerminal_t; + + /** \brief Audio class-specific Output Terminal Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_OutputTerminal_t for the version of this type with standard element names. */ 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. */ + 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 + 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 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_Audio_OutputTerminal_t; + uint8_t TerminalStrIndex; /**< Index of a string descriptor describing this descriptor within the device. */ + } USB_Audio_Descriptor_OutputTerminal_t; + + /** \brief Audio class-specific Output Terminal Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_OutputTerminal_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ + + uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + uint8_t bTerminalID; /**< ID value of this terminal unit - must be a unique value within the device. */ + uint16_t wTerminalType; /**< Type of terminal, a TERMINAL_* mask. */ + uint8_t bAssocTerminal; /**< ID of associated input terminal, for physically grouped terminals + * such as the speaker and microphone of a phone handset. + */ + uint8_t bSourceID; /**< ID value of the unit this terminal's audio is sourced from. */ + + uint8_t iTerminal; /**< Index of a string descriptor describing this descriptor within the device. */ + } USB_Audio_StdDescriptor_OutputTerminal_t; - /** \brief Audio class-specific Streaming Audio Interface Descriptor. + /** \brief Audio class-specific Streaming Audio Interface Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_Interface_AS_t for the version of this type with standard element names. */ 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. */ + 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 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_Audio_Interface_AS_t; + 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_Audio_Descriptor_Interface_AS_t; + + /** \brief Audio class-specific Streaming Audio Interface Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_Interface_AS_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ + + uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + + uint8_t bTerminalLink; /**< ID value of the output terminal this descriptor is describing. */ + + uint8_t bDelay; /**< Delay in frames resulting from the complete sample processing from input to output. */ + uint16_t wFormatTag; /**< Format of the audio stream, see Audio Device Formats specification. */ + } USB_Audio_StdDescriptor_Interface_AS_t; /** \brief 24-Bit Audio Frequency Structure. * @@ -341,35 +482,67 @@ */ typedef struct { - uint16_t LowWord; /**< Low 16 bits of the 24-bit value. */ - uint8_t HighByte; /**< Upper 8 bits of the 24-bit value. */ + uint16_t LowWord; /**< Low 16 bits of the 24-bit value. */ + uint8_t HighByte; /**< Upper 8 bits of the 24-bit value. */ } USB_Audio_SampleFreq_t; - /** \brief Audio class-specific Format Descriptor. + /** \brief Audio class-specific Format Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_Format_t for the version of this type with standard element names. */ 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. */ + 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. */ + USB_Audio_SampleFreq_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES]; /**< Sample frequencies supported by the device (must be 24-bit). */ + } USB_Audio_Descriptor_Format_t; + + /** \brief Audio class-specific Format Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_Format_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ - 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 bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + + uint8_t bFormatType; /**< Format of the audio stream, see Audio Device Formats specification. */ + uint8_t bNrChannels; /**< 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 bSubFrameSize; /**< Size in bytes of each channel's sample data in the stream. */ + uint8_t bBitResolution; /**< Bits of resolution of each channel's samples in the stream. */ - uint8_t SampleFrequencyType; /**< Total number of sample frequencies supported by the device. */ - USB_Audio_SampleFreq_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES]; /**< Sample frequencies supported by the device. */ - } USB_Audio_Format_t; + uint8_t bSampleFrequencyType; /**< Total number of sample frequencies supported by the device. */ + uint8_t SampleFrequencies[AUDIO_TOTAL_SAMPLE_RATES * 3]; /**< Sample frequencies supported by the device (must be 24-bit). */ + } USB_Audio_StdDescriptor_Format_t; - /** \brief Audio class-specific Streaming Endpoint Descriptor. + /** \brief Audio class-specific Streaming Endpoint Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Std_t for the version of this type with standard element names. */ typedef struct { @@ -377,13 +550,46 @@ uint8_t Refresh; /**< Always set to zero for Audio class devices. */ uint8_t SyncEndpointNumber; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */ - } USB_Audio_StreamEndpoint_Std_t; + } USB_Audio_Descriptor_StreamEndpoint_Std_t; + + /** \brief Audio class-specific Streaming Endpoint Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_StreamEndpoint_Std_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a + * value given by the specific class. + */ + uint8_t bEndpointAddress; /**< Logical address of the endpoint within the device for the current + * configuration, including direction mask. + */ + uint8_t bmAttributes; /**< Endpoint attributes, comprised of a mask of the endpoint type (EP_TYPE_*) + * and attributes (ENDPOINT_ATTR_*) masks. + */ + uint16_t wMaxPacketSize; /**< Size of the endpoint bank, in bytes. This indicates the maximum packet size + * that the endpoint can receive at a time. + */ + uint8_t bInterval; /**< Polling interval in milliseconds for the endpoint if it is an INTERRUPT or + * ISOCHRONOUS type. + */ + + uint8_t bRefresh; /**< Always set to zero for Audio class devices. */ + uint8_t bSynchAddress; /**< Endpoint address to send synchronization information to, if needed (zero otherwise). */ + } USB_Audio_StdDescriptor_StreamEndpoint_Std_t; - /** \brief Audio class-specific Extended Endpoint Descriptor. + /** \brief Audio class-specific Extended Endpoint Descriptor (LUFA naming conventions). * * 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. + * + * \see \ref USB_Audio_StdDescriptor_StreamEndpoint_Spc_t for the version of this type with standard element names. */ typedef struct { @@ -394,8 +600,32 @@ 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_Audio_StreamEndpoint_Spc_t; + } USB_Audio_Descriptor_StreamEndpoint_Spc_t; + /** \brief Audio class-specific Extended Endpoint Descriptor (USB-IF naming conventions). + * + * 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. + * + * \see \ref USB_Audio_Descriptor_StreamEndpoint_Spc_t for the version of this type with non-standard LUFA specific + * element names. + */ + typedef struct + { + uint8_t bLength; /**< Size of the descriptor, in bytes. */ + uint8_t bDescriptorType; /**< Type of the descriptor, either a value in \ref USB_DescriptorTypes_t or a value + * given by the specific class. + */ + + uint8_t bDescriptorSubtype; /**< Sub type value used to distinguish between audio class-specific descriptors. */ + + uint8_t bmAttributes; /**< Audio class-specific endpoint attributes, such as ACCEPTS_SMALL_PACKETS. */ + + uint8_t bLockDelayUnits; /**< Units used for the LockDelay field, see Audio class specification. */ + uint16_t wLockDelay; /**< Time required to internally lock endpoint's internal clock recovery circuitry. */ + } USB_Audio_StdDescriptor_StreamEndpoint_Spc_t; + /* Disable C linkage for C++ Compilers: */ #if defined(__cplusplus) } |