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+/**
+  ******************************************************************************
+  * @file    usbd_audio_cdc_comp.h
+  * @author  MCD Application Team/ mcHF Devel
+  * @version V2.4.2
+  * @date    11-December-2015
+  * @brief   header file for the usbd_audio.c file.
+  ******************************************************************************
+  * @attention
+  *
+  * <h2><center>&copy; COPYRIGHT 2015 STMicroelectronics</center></h2>
+  *
+  * Licensed under MCD-ST Liberty SW License Agreement V2, (the "License");
+  * You may not use this file except in compliance with the License.
+  * You may obtain a copy of the License at:
+  *
+  *        http://www.st.com/software_license_agreement_liberty_v2
+  *
+  * Unless required by applicable law or agreed to in writing, software 
+  * distributed under the License is distributed on an "AS IS" BASIS, 
+  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  * See the License for the specific language governing permissions and
+  * limitations under the License.
+  *
+  ******************************************************************************
+  */
+ 
+/* Define to prevent recursive inclusion -------------------------------------*/
+#ifndef __USB_AUDIO_COMP_H
+#define __USB_AUDIO_COMP_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/* Includes ------------------------------------------------------------------*/
+#include  "usbd_ioreq.h"
+#include  "usbd_desc.h"
+/** @addtogroup STM32_USB_DEVICE_LIBRARY
+  * @{
+  */
+  
+/** @defgroup USBD_AUDIO
+  * @brief This file is the Header file for usbd_audio.c
+  * @{
+  */ 
+
+
+/** @defgroup USBD_AUDIO_Exported_Defines
+  * @{
+  */ 
+///#define AUDIO_OUT_EP                                  0x01
+
+// #define USB_AUDIO_CONFIG_DESC_SIZ                     109
+
+
+#define USBD_AUDIO_OUT_CHANNELS 2
+#define USBD_AUDIO_IN_CHANNELS 2
+
+#define USBD_AUDIO_IN_OUT_DIV 1
+// USBD_IN_AUDIO_IN_OUT_DIV must be set to an integer number between 3 and 1
+// in order to keep within the limits of the existing code in audio_driver.c audio_rx_processor
+
+#define USBD_AUDIO_IN_FREQ (USBD_AUDIO_FREQ/USBD_AUDIO_IN_OUT_DIV)
+
+
+#define AUDIO_CONTROL_MUTE                            0x0001
+
+#define AUDIO_FORMAT_TYPE_I                           0x01
+#define AUDIO_FORMAT_TYPE_III                         0x03
+
+#define AUDIO_ENDPOINT_GENERAL                        0x01
+
+#define AUDIO_REQ_GET_CUR                             0x81
+#define AUDIO_REQ_SET_CUR                             0x01
+
+#define AUDIO_OUT_STREAMING_CTRL                      0x02
+#define AUDIO_IN_STREAMING_CTRL                       0x06
+
+
+
+#define AUDIO_OUT_PACKET                              (uint32_t)(((USBD_AUDIO_FREQ * 2 * 2) /1000)) 
+#define AUDIO_DEFAULT_VOLUME                          70
+    
+/* Number of sub-packets in the audio transfer buffer. You can modify this value but always make sure
+  that it is an even number and higher than 3 */
+#define AUDIO_OUT_PACKET_NUM                          16
+/* Total size of the audio transfer buffer */
+#define AUDIO_TOTAL_BUF_SIZE                          ((uint32_t)(AUDIO_OUT_PACKET * AUDIO_OUT_PACKET_NUM))
+    
+    /* Audio Commands enumeration */
+typedef enum
+{
+  AUDIO_CMD_START = 1,
+  AUDIO_CMD_PLAY,
+  AUDIO_CMD_STOP,
+  AUDIO_CMD_PAUSE
+}AUDIO_CMD_TypeDef;
+
+
+typedef enum
+{
+  AUDIO_OFFSET_NONE = 0,
+  AUDIO_OFFSET_HALF,
+  AUDIO_OFFSET_FULL,  
+  AUDIO_OFFSET_UNKNOWN,    
+}
+AUDIO_OffsetTypeDef;
+/**
+  * @}
+  */ 
+
+
+/** @defgroup USBD_CORE_Exported_TypesDefinitions
+  * @{
+  */
+ typedef struct
+{
+   uint8_t cmd;   
+   uint8_t data[USB_MAX_EP0_SIZE];  
+   uint8_t len;  
+   uint8_t unit;    
+}
+USBD_AUDIO_ControlTypeDef; 
+
+
+
+typedef struct
+{
+  __IO uint32_t             alt_setting[USBD_MAX_NUM_INTERFACES+1];
+  // uint8_t                   buffer[AUDIO_TOTAL_BUF_SIZE];
+  // AUDIO_OffsetTypeDef       offset;
+  // uint8_t                    rd_enable;
+  // uint16_t                   rd_ptr;
+  // uint16_t                   wr_ptr;
+  USBD_AUDIO_ControlTypeDef control;
+  uint32_t SendFlag;
+  uint32_t PlayFlag;
+}
+USBD_AUDIO_HandleTypeDef; 
+
+
+typedef struct
+{
+    int8_t  (*Init)         (uint32_t  AudioFreq, uint32_t Volume, uint32_t options);
+    int8_t  (*DeInit)       (uint32_t options);
+    int8_t  (*AudioCmd)     (uint8_t* pbuf, uint32_t size, uint8_t cmd);
+    int8_t  (*VolumeCtl)    (uint8_t vol);
+    int8_t  (*MuteCtl)      (uint8_t cmd);
+    int8_t  (*PeriodicTC)   (uint8_t cmd);
+    int8_t  (*GetState)     (void);
+    int8_t  (*InVolumeCtl)    (uint8_t vol);
+}USBD_AUDIO_ItfTypeDef;
+/**
+  * @}
+  */ 
+
+
+
+/** @defgroup USBD_CORE_Exported_Macros
+  * @{
+  */ 
+
+/**
+  * @}
+  */ 
+
+/** @defgroup USBD_CORE_Exported_Variables
+  * @{
+  */ 
+
+extern USBD_ClassTypeDef  USBD_AUDIO;
+#define USBD_AUDIO_CLASS    &USBD_AUDIO
+/**
+  * @}
+  */ 
+
+/** @defgroup USB_CORE_Exported_Functions
+  * @{
+  */ 
+uint8_t  USBD_AUDIO_RegisterInterface  (USBD_HandleTypeDef   *pdev, 
+                                        USBD_AUDIO_ItfTypeDef *fops);
+
+void  USBD_AUDIO_Sync (USBD_HandleTypeDef *pdev, AUDIO_OffsetTypeDef offset);
+/**
+  * @}
+  */ 
+
+typedef struct UsbAudioUnit_s
+{
+    uint8_t cs;
+    uint8_t cn;
+    int16_t min;
+    int16_t max;
+    uint16_t res;
+    int16_t cur;
+    __IO uint8_t* ptr; // pointer to data structure which is used elsewhere to store volume
+} UsbAudioUnit;
+
+// In / Out Volume;
+
+enum
+{
+    UnitVolumeTX = 0,
+    UnitVolumeRX,
+    UnitMax
+};
+extern UsbAudioUnit usbUnits[UnitMax];
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif  /* __USB_AUDIO_COMP_H */
+/**
+  * @}
+  */ 
+
+/**
+  * @}
+  */ 
+  
+/************************ (C) COPYRIGHT STMicroelectronics *****END OF FILE****/