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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.
*/
#ifndef _AUDIO_CLASS_H_
#define _AUDIO_CLASS_H_
/* Includes: */
#include "../../USB.h"
#include <string.h>
/* Enable C linkage for C++ Compilers: */
#if defined(__cplusplus)
extern "C" {
#endif
/* 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 AUDIO_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)
/* 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 separate 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 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_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;
typedef struct
{
uint8_t StreamingInterfaceNumber;
uint8_t DataINEndpointNumber;
uint16_t DataINEndpointSize;
uint8_t DataOUTEndpointNumber;
uint16_t DataOUTEndpointSize;
bool InterfaceEnabled;
} USB_ClassInfo_Audio_t;
/* Function Prototypes: */
bool USB_Audio_ConfigureEndpoints(USB_ClassInfo_Audio_t* AudioInterfaceInfo);
void USB_Audio_ProcessControlPacket(USB_ClassInfo_Audio_t* AudioInterfaceInfo);
void USB_Audio_USBTask(USB_ClassInfo_Audio_t* AudioInterfaceInfo);
int8_t USB_Audio_ReadSample8(void);
int16_t USB_Audio_ReadSample16(void);
int32_t USB_Audio_ReadSample24(void);
void USB_Audio_WriteSample8(int8_t Sample);
void USB_Audio_WriteSample16(int16_t Sample);
void USB_Audio_WriteSample24(int32_t Sample);
bool USB_Audio_IsSampleReceived(USB_ClassInfo_Audio_t* AudioInterfaceInfo);
bool USB_Audio_IsReadyForNextSample(USB_ClassInfo_Audio_t* AudioInterfaceInfo);
/* Disable C linkage for C++ Compilers: */
#if defined(__cplusplus)
}
#endif
#endif
|
