#endif
/* Macros: */
- #if !defined(AUDIO_TOTAL_SAMPLE_RATES) || defined(__DOXYGEN__)
- /** Total number of discrete audio sample rates supported by the device. This value can be overridden by defining this
- * token in the project makefile to the desired value, and passing it to the compiler via the -D switch.
- */
- #define AUDIO_TOTAL_SAMPLE_RATES 1
- #endif
-
/** \name Audio Channel Masks */
//@{
/** Supported channel mask for an Audio class terminal descriptor. See the Audio class specification for more details. */
*
* \param[in] freq Required audio sampling frequency in HZ
*/
- #define AUDIO_SAMPLE_FREQ(freq) {.Byte1 = (freq & 0x0000FF), .Byte2 = ((freq >> 8) & 0xFF), .Byte3 = ((freq >> 16) & 0xFF)}
+ #define AUDIO_SAMPLE_FREQ(freq) {.Byte1 = ((uint32_t)freq & 0xFF), .Byte2 = (((uint32_t)freq >> 8) & 0xFF), .Byte3 = (((uint32_t)freq >> 16) & 0xFF)}
/** 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 AUDIO_EP_ACCEPTS_SMALL_PACKETS (0 << 7)
+ /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
+ * allows for sampling frequency adjustments to be made via control requests directed at the endpoint.
+ */
+ #define AUDIO_EP_SAMPLE_FREQ_CONTROL (1 << 0)
+
+ /** Mask for the attributes parameter of an Audio class-specific Endpoint descriptor, indicating that the endpoint
+ * allows for pitch adjustments to be made via control requests directed at the endpoint.
+ */
+ #define AUDIO_EP_PITCH_CONTROL (1 << 1)
+
/* Enums: */
/** Enum for possible Class, Subclass and Protocol values of device and interface descriptors relating to the Audio
* device class.
AUDIO_DSUBTYPE_CSEndpoint_General = 0x01, /**< Audio class specific endpoint general descriptor. */
};
+ /** Enum for the Audio class specific control requests that can be issued by the USB bus host. */
+ enum Audio_ClassRequests_t
+ {
+ AUDIO_REQ_SetCurrent = 0x01, /**< Audio class-specific request to set the current value of a parameter within the device. */
+ AUDIO_REQ_SetMinimum = 0x02, /**< Audio class-specific request to set the minimum value of a parameter within the device. */
+ AUDIO_REQ_SetMaximum = 0x03, /**< Audio class-specific request to set the maximum value of a parameter within the device. */
+ AUDIO_REQ_SetResolution = 0x04, /**< Audio class-specific request to set the resolution value of a parameter within the device. */
+ AUDIO_REQ_SetMemory = 0x05, /**< Audio class-specific request to set the memory value of a parameter within the device. */
+ AUDIO_REQ_GetCurrent = 0x81, /**< Audio class-specific request to get the current value of a parameter within the device. */
+ AUDIO_REQ_GetMinimum = 0x82, /**< Audio class-specific request to get the minimum value of a parameter within the device. */
+ AUDIO_REQ_GetMaximum = 0x83, /**< Audio class-specific request to get the maximum value of a parameter within the device. */
+ AUDIO_REQ_GetResolution = 0x84, /**< Audio class-specific request to get the resolution value of a parameter within the device. */
+ AUDIO_REQ_GetMemory = 0x85, /**< Audio class-specific request to get the memory value of a parameter within the device. */
+ AUDIO_REQ_GetStatus = 0xFF, /**< Audio class-specific request to get the device status. */
+ };
+
+ /** Enum for Audio class specific Endpoint control modifiers which can be set and retrieved by a USB host, if the corresponding
+ * endpoint control is indicated to be supported in the Endpoint's Audio-class specific endpoint descriptor.
+ */
+ enum Audio_EndpointControls_t
+ {
+ AUDIO_EPCONTROL_SamplingFreq = 0x01, /**< Sampling frequency adjustment of the endpoint. */
+ AUDIO_EPCONTROL_Pitch = 0x02, /**< Pitch adjustment of the endpoint. */
+ };
+
/* Type Defines: */
/** \brief Audio class-specific Input Terminal Descriptor (LUFA naming conventions).
*
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 \c ChanelControlls array. */
+ uint8_t ControlSize; /**< Size of each element in the \c ChannelControls 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. */
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 \c ChanelControlls array. */
+ uint8_t bControlSize; /**< Size of each element in the \c ChannelControls 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. */
uint16_t wFormatTag; /**< Format of the audio stream, see Audio Device Formats specification. */
} ATTR_PACKED USB_Audio_StdDescriptor_Interface_AS_t;
- /** \brief 24-Bit Audio Frequency Structure.
- *
- * 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 \ref AUDIO_SAMPLE_FREQ() macro.
- */
- typedef struct
- {
- uint8_t Byte1; /**< Lowest 8 bits of the 24-bit value. */
- uint8_t Byte2; /**< Middle 8 bits of the 24-bit value. */
- uint8_t Byte3; /**< Upper 8 bits of the 24-bit value. */
- } ATTR_PACKED USB_Audio_SampleFreq_t;
-
/** \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.
*
+ * \note This descriptor <b>must</b> be followed by one or more \ref USB_Audio_SampleFreq_t elements containing
+ * the continuous or discrete sample frequencies.
+ *
* \see \ref USB_Audio_StdDescriptor_Format_t for the version of this type with standard element names.
*/
typedef struct
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). */
+ uint8_t TotalDiscreteSampleRates; /**< Total number of discrete sample frequencies supported by the device. When
+ * zero, this must be followed by the lower and upper continuous sampling
+ * frequencies supported by the device; otherwise, this must be followed
+ * by the given number of discrete sampling frequencies supported.
+ */
} ATTR_PACKED USB_Audio_Descriptor_Format_t;
+ /** \brief 24-Bit Audio Frequency Structure.
+ *
+ * Type define for a 24bit audio sample frequency structure. As GCC does not contain a built in 24-bit datatype,
+ * this this structure is used to build up the value instead. Fill this structure with the \ref AUDIO_SAMPLE_FREQ() macro.
+ */
+ typedef struct
+ {
+ uint8_t Byte1; /**< Lowest 8 bits of the 24-bit value. */
+ uint8_t Byte2; /**< Middle 8 bits of the 24-bit value. */
+ uint8_t Byte3; /**< Upper 8 bits of the 24-bit value. */
+ } ATTR_PACKED USB_Audio_SampleFreq_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.
*
+ * \note This descriptor <b>must</b> be followed by one or more 24-bit integer elements containing the continuous
+ * or discrete sample frequencies.
+ *
* \see \ref USB_Audio_Descriptor_Format_t for the version of this type with non-standard LUFA specific
* element names.
*/
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 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). */
+ uint8_t bSampleFrequencyType; /**< Total number of sample frequencies supported by the device. When
+ * zero, this must be followed by the lower and upper continuous sampling
+ * frequencies supported by the device; otherwise, this must be followed
+ * by the given number of discrete sampling frequencies supported.
+ */
} ATTR_PACKED USB_Audio_StdDescriptor_Format_t;
/** \brief Audio class-specific Streaming Endpoint Descriptor (LUFA naming conventions).
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