[usbd] Add usb audio class.

components/drivers/Kconfig

@@ -660,6 +660,9 @@ menu "Using USB"
                     config _RT_USB_DEVICE_WINUSB
                         bool "Enable to use device as winusb device"
                         select RT_USB_DEVICE_WINUSB
+                    config _RT_USB_DEVICE_AUDIO
+                        bool "Enable to use device as audio device"
+                        select RT_USB_DEVICE_AUDIO
                 endchoice
                 if RT_USB_DEVICE_COMPOSITE
                     config RT_USB_DEVICE_CDC
@@ -685,6 +688,9 @@ menu "Using USB"
                     config RT_USB_DEVICE_WINUSB
                         bool "Enable to use device as winusb device"
                         default n
+                    config RT_USB_DEVICE_AUDIO
+                        bool "Enable to use device as audio device"
+                        default n
                 endif
                 if RT_USB_DEVICE_CDC
                     config RT_VCOM_TASK_STK_SIZE
@@ -752,6 +758,24 @@ menu "Using USB"
                         bool "Use to HID device as media keyboard"
                         default y
                 endif
+                if RT_USB_DEVICE_AUDIO
+                    config RT_USB_DEVICE_AUDIO_MIC
+                        bool "Use usb mic device as audio device"
+                        default n
+                        if RT_USB_DEVICE_AUDIO_MIC
+                            config RT_USBD_MIC_DEVICE_NAME
+                            string "audio mic device name"
+                            default "mic0"
+                        endif
+                    config RT_USB_DEVICE_AUDIO_SPEAKER
+                        bool "Use usb speaker device as audio device"
+                        default n
+                        if RT_USB_DEVICE_AUDIO_SPEAKER
+                            config RT_USBD_SPEAKER_DEVICE_NAME
+                            string "audio speaker device name"
+                            default "sound0"
+                        endif
+                endif
         endif
     endmenu
 endmenu

components/drivers/usb/usbdevice/SConscript

@@ -24,6 +24,12 @@ if GetDepend('RT_USB_DEVICE_RNDIS'):
 
 if GetDepend('RT_USB_DEVICE_WINUSB'):
 	src += Glob('class/winusb.c')
+	
+if GetDepend('RT_USB_DEVICE_AUDIO_MIC'):
+	src += Glob('class/audio_mic.c')
+
+if GetDepend('RT_USB_DEVICE_AUDIO_SPEAKER'):
+	src += Glob('class/audio_speaker.c')
 
 CPPPATH = [cwd]
 

components/drivers/usb/usbdevice/class/audio_mic.c

+/*
+ * Copyright (c) 2006-2019, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-09-07     flybreak     the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtservice.h>
+#include <rtdevice.h>
+
+#include "drivers/usb_device.h"
+#include "audio.h"
+
+#define DBG_TAG              "usbd.audio.mic"
+#define DBG_LVL              DBG_INFO
+#include <rtdbg.h>
+
+#define RECORD_SAMPLERATE   16000
+#define RECORD_CHANNEL      1
+#define RESOLUTION_BITS     16
+
+#define RESOLUTION_BYTE     (RESOLUTION_BITS / 8)
+#define RECORD_PER_MS_SZ    ((RECORD_SAMPLERATE * RECORD_CHANNEL * RESOLUTION_BYTE) / 1000)
+#define RECORD_BUFFER_SZ    (RECORD_PER_MS_SZ * 20)  /* 20ms */
+
+#if defined(RT_USBD_MIC_DEVICE_NAME)
+    #define MIC_DEVICE_NAME    RT_USBD_MIC_DEVICE_NAME
+#else
+    #define MIC_DEVICE_NAME    "mic0"
+#endif
+
+#define EVENT_RECORD_START   (1 << 0)
+#define EVENT_RECORD_STOP    (1 << 1)
+#define EVENT_RECORD_DATA    (1 << 2)
+
+/*
+ * uac mic descriptor define
+ */
+
+#define UAC_CS_INTERFACE            0x24
+#define UAC_CS_ENDPOINT             0x25
+
+#define UAC_MAX_PACKET_SIZE         64
+#define UAC_EP_MAX_PACKET_SIZE      32
+#define UAC_CHANNEL_NUM             RECORD_CHANNEL
+#define UAC_INTR_NUM                1
+#define UAC_CH_NUM                  1
+#define UAC_FORMAT_NUM              1
+
+struct uac_ac_descriptor
+{
+#ifdef RT_USB_DEVICE_COMPOSITE
+    struct uiad_descriptor iad_desc;
+#endif
+    struct uinterface_descriptor intf_desc;
+    DECLARE_UAC_AC_HEADER_DESCRIPTOR(UAC_INTR_NUM) hdr_desc;
+    struct uac_input_terminal_descriptor it_desc;
+    struct uac1_output_terminal_descriptor ot_desc;
+#if UAC_USE_FEATURE_UNIT
+    DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(UAC_CH_NUM) feature_unit_desc;
+#endif
+};
+
+struct uac_as_descriptor
+{
+    struct uinterface_descriptor intf_desc;
+    struct uac1_as_header_descriptor hdr_desc;
+    DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_FORMAT_NUM) format_type_desc;
+    struct uendpoint_descriptor ep_desc;
+    struct uac_iso_endpoint_descriptor as_ep_desc;
+};
+
+/*
+ * uac mic device type
+ */
+
+struct uac_audio_mic
+{
+    rt_device_t  dev;
+    rt_event_t   event;
+
+    rt_uint8_t  *buffer;
+    rt_uint32_t  buffer_index;
+
+    uep_t        ep;
+};
+static struct uac_audio_mic mic;
+
+ALIGN(4)
+static struct udevice_descriptor dev_desc =
+{
+    USB_DESC_LENGTH_DEVICE,     //bLength;
+    USB_DESC_TYPE_DEVICE,       //type;
+    USB_BCD_VERSION,            //bcdUSB;
+    USB_CLASS_DEVICE,           //bDeviceClass;
+    0x00,                       //bDeviceSubClass;
+    0x00,                       //bDeviceProtocol;
+    UAC_MAX_PACKET_SIZE,        //bMaxPacketSize0;
+    _VENDOR_ID,                 //idVendor;
+    _PRODUCT_ID,                //idProduct;
+    USB_BCD_DEVICE,             //bcdDevice;
+    USB_STRING_MANU_INDEX,      //iManufacturer;
+    USB_STRING_PRODUCT_INDEX,   //iProduct;
+    USB_STRING_SERIAL_INDEX,    //iSerialNumber;Unused.
+    USB_DYNAMIC,                //bNumConfigurations;
+};
+
+//FS and HS needed
+ALIGN(4)
+static struct usb_qualifier_descriptor dev_qualifier =
+{
+    sizeof(dev_qualifier),          //bLength
+    USB_DESC_TYPE_DEVICEQUALIFIER,  //bDescriptorType
+    0x0200,                         //bcdUSB
+    USB_CLASS_AUDIO,                //bDeviceClass
+    0x00,                           //bDeviceSubClass
+    0x00,                           //bDeviceProtocol
+    64,                             //bMaxPacketSize0
+    0x01,                           //bNumConfigurations
+    0,
+};
+
+ALIGN(4)
+const static char *_ustring[] =
+{
+    "Language",
+    "RT-Thread Team.",
+    "Microphone",
+    "32021919830108",
+    "Configuration",
+    "Interface",
+};
+
+ALIGN(4)
+static struct uac_ac_descriptor ac_desc =
+{
+#ifdef RT_USB_DEVICE_COMPOSITE
+    /* Interface Association Descriptor */
+    {
+        USB_DESC_LENGTH_IAD,
+        USB_DESC_TYPE_IAD,
+        USB_DYNAMIC,
+        0x02,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOSTREAMING,
+        0x00,
+        0x00,
+    },
+#endif
+    /* Interface Descriptor */
+    {
+        USB_DESC_LENGTH_INTERFACE,
+        USB_DESC_TYPE_INTERFACE,
+        USB_DYNAMIC,
+        0x00,
+        0x00,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOCONTROL,
+        0x00,
+        0x00,
+    },
+    /* Header Descriptor */
+    {
+        UAC_DT_AC_HEADER_SIZE(UAC_INTR_NUM),
+        UAC_CS_INTERFACE,
+        UAC_HEADER,
+        0x0100,    /* Version: 1.00 */
+        0x001E,    /* Total length: 30 */
+        0x01,      /* Total number of interfaces: 1 */
+        {0x01},    /* Interface number: 1 */
+    },
+    /*  Input Terminal Descriptor */
+    {
+        UAC_DT_INPUT_TERMINAL_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_INPUT_TERMINAL,
+        0x01,      /* Terminal ID: 1 */
+        0x0201,    /* Terminal Type: Microphone (0x0201) */
+        0x00,      /* Assoc Terminal: 0 */
+        0x01,      /* Number Channels: 1 */
+        0x0000,    /* Channel Config: 0x0000 */
+        0x00,      /* Channel Names: 0 */
+        0x00,      /* Terminal: 0 */
+    },
+    /*  Output Terminal Descriptor */
+    {
+        UAC_DT_OUTPUT_TERMINAL_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_OUTPUT_TERMINAL,
+        0x02,      /* Terminal ID: 2 */
+        0x0101,    /* Terminal Type: USB Streaming (0x0101) */
+        0x00,      /* Assoc Terminal: 0 */
+        0x01,      /* Source ID: 1 */
+        0x00,      /* Terminal: 0 */
+    },
+#if UAC_USE_FEATURE_UNIT
+    /*  Feature unit Descriptor */
+    {
+        UAC_DT_FEATURE_UNIT_SIZE(UAC_CH_NUM),
+        UAC_CS_INTERFACE,
+        UAC_FEATURE_UNIT,
+        0x02,
+        0x0101,
+        0x00,
+        0x01,
+    },
+#endif
+};
+
+ALIGN(4)
+static struct uinterface_descriptor as_desc0 =
+{
+    USB_DESC_LENGTH_INTERFACE,
+    USB_DESC_TYPE_INTERFACE,
+    USB_DYNAMIC,
+    0x00,
+    0x00,
+    USB_CLASS_AUDIO,
+    USB_SUBCLASS_AUDIOSTREAMING,
+    0x00,
+    0x00,
+};
+
+ALIGN(4)
+static struct uac_as_descriptor as_desc =
+{
+    /* Interface Descriptor */
+    {
+        USB_DESC_LENGTH_INTERFACE,
+        USB_DESC_TYPE_INTERFACE,
+        USB_DYNAMIC,
+        0x01,
+        0x01,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOSTREAMING,
+        0x00,
+        0x00,
+    },
+    /* General AS Descriptor */
+    {
+        UAC_DT_AS_HEADER_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_AS_GENERAL,
+        0x02,      /* Terminal ID: 2 */
+        0x01,      /* Interface delay in frames: 1 */
+        UAC_FORMAT_TYPE_I_PCM,
+    },
+    /* Format type i Descriptor */
+    {
+        UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(UAC_FORMAT_NUM),
+        UAC_CS_INTERFACE,
+        UAC_FORMAT_TYPE,
+        UAC_FORMAT_TYPE_I,
+        UAC_CHANNEL_NUM,
+        2,         /* Subframe Size: 2 */
+        RESOLUTION_BITS,
+        0x01,      /* Samples Frequence Type: 1 */
+        {0},       /* Samples Frequence */
+    },
+    /* Endpoint Descriptor */
+    {
+        USB_DESC_LENGTH_ENDPOINT,
+        USB_DESC_TYPE_ENDPOINT,
+        USB_DYNAMIC | USB_DIR_IN,
+        USB_EP_ATTR_ISOC,
+        UAC_EP_MAX_PACKET_SIZE,
+        0x01,
+    },
+    /* AS Endpoint Descriptor */
+    {
+        UAC_ISO_ENDPOINT_DESC_SIZE,
+        UAC_CS_ENDPOINT,
+        UAC_MS_GENERAL,
+    },
+};
+
+void mic_entry(void *parameter)
+{
+    struct rt_audio_caps caps = {0};
+    rt_uint32_t e, index;
+
+    mic.buffer = rt_malloc(RECORD_BUFFER_SZ);
+    if (mic.buffer == RT_NULL)
+    {
+        LOG_E("malloc failed");
+        goto __exit;
+    }
+
+    mic.dev = rt_device_find(MIC_DEVICE_NAME);
+    if (mic.dev == RT_NULL)
+    {
+        LOG_E("can't find device:%s", MIC_DEVICE_NAME);
+        goto __exit;
+    }
+
+    while (1)
+    {
+        if (rt_event_recv(mic.event, EVENT_RECORD_START,
+                          RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
+                          1000, &e) != RT_EOK)
+        {
+            continue;
+        }
+        LOG_D("record start");
+
+        rt_device_open(mic.dev, RT_DEVICE_OFLAG_RDONLY);
+
+        caps.main_type               = AUDIO_TYPE_INPUT;
+        caps.sub_type                = AUDIO_DSP_PARAM;
+        caps.udata.config.samplerate = RECORD_SAMPLERATE;
+        caps.udata.config.channels   = RECORD_CHANNEL;
+        caps.udata.config.samplebits = RESOLUTION_BITS;
+        rt_device_control(mic.dev, AUDIO_CTL_CONFIGURE, &caps);
+
+        while (1)
+        {
+            if (rt_event_recv(mic.event, EVENT_RECORD_DATA | EVENT_RECORD_STOP,
+                              RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
+                              1000, &e) != RT_EOK)
+            {
+                continue;
+            }
+            if (e & EVENT_RECORD_DATA)
+            {
+                index = (mic.buffer_index >= RECORD_BUFFER_SZ / 2) ? 0 : (RECORD_BUFFER_SZ / 2);
+                rt_device_read(mic.dev, 0, mic.buffer + index, RECORD_BUFFER_SZ / 2);
+            }
+            else if (e & EVENT_RECORD_STOP)
+            {
+                break;
+            }
+        }
+        LOG_D("record stop");
+        rt_device_close(mic.dev);
+    }
+
+__exit:
+    if (mic.buffer)
+        rt_free(mic.buffer);
+}
+
+static rt_err_t _record_start(ufunction_t func)
+{
+    mic.ep->request.buffer = RT_NULL;
+    mic.ep->request.size = UAC_EP_MAX_PACKET_SIZE;
+    mic.ep->request.req_type = UIO_REQUEST_WRITE;
+    rt_usbd_io_request(func->device, mic.ep, &mic.ep->request);
+
+    rt_event_send(mic.event, EVENT_RECORD_START);
+    return 0;
+}
+
+static rt_err_t _record_stop(ufunction_t func)
+{
+    rt_event_send(mic.event, EVENT_RECORD_STOP);
+    return 0;
+}
+
+static rt_err_t _ep_data_in_handler(ufunction_t func, rt_size_t size)
+{
+    RT_ASSERT(func != RT_NULL);
+    LOG_D("_ep_data_in_handler");
+
+    mic.ep->request.buffer = mic.buffer + mic.buffer_index;
+    mic.ep->request.size = UAC_EP_MAX_PACKET_SIZE;
+    mic.ep->request.req_type = UIO_REQUEST_WRITE;
+    rt_usbd_io_request(func->device, mic.ep, &mic.ep->request);
+
+    mic.buffer_index += UAC_EP_MAX_PACKET_SIZE;
+    if (mic.buffer_index >= RECORD_BUFFER_SZ)
+    {
+        mic.buffer_index = 0;
+        rt_event_send(mic.event, EVENT_RECORD_DATA);
+    }
+    else if (mic.buffer_index == RECORD_BUFFER_SZ / 2)
+    {
+        rt_event_send(mic.event, EVENT_RECORD_DATA);
+    }
+
+    return RT_EOK;
+}
+
+static rt_err_t _interface_as_handler(ufunction_t func, ureq_t setup)
+{
+    RT_ASSERT(func != RT_NULL);
+    RT_ASSERT(func->device != RT_NULL);
+    RT_ASSERT(setup != RT_NULL);
+
+    LOG_D("_interface_as_handler");
+
+    if ((setup->request_type & USB_REQ_TYPE_MASK) == USB_REQ_TYPE_STANDARD)
+    {
+        switch (setup->bRequest)
+        {
+        case USB_REQ_GET_INTERFACE:
+            break;
+        case USB_REQ_SET_INTERFACE:
+            LOG_D("set interface handler");
+            if (setup->wValue == 1)
+            {
+                _record_start(func);
+            }
+            else if (setup->wValue == 0)
+            {
+                _record_stop(func);
+            }
+            break;
+        default:
+            LOG_D("unknown uac request 0x%x", setup->bRequest);
+            return -RT_ERROR;
+        }
+    }
+
+    return RT_EOK;
+}
+
+static rt_err_t _function_enable(ufunction_t func)
+{
+    RT_ASSERT(func != RT_NULL);
+
+    LOG_D("uac function enable");
+
+    return RT_EOK;
+}
+
+static rt_err_t _function_disable(ufunction_t func)
+{
+    RT_ASSERT(func != RT_NULL);
+
+    LOG_D("uac function disable");
+    _record_stop(func);
+    return RT_EOK;
+}
+
+static struct ufunction_ops ops =
+{
+    _function_enable,
+    _function_disable,
+    RT_NULL,
+};
+/**
+ * This function will configure uac descriptor.
+ *
+ * @param comm the communication interface number.
+ * @param data the data interface number.
+ *
+ * @return RT_EOK on successful.
+ */
+static rt_err_t _uac_descriptor_config(struct uac_ac_descriptor *ac,
+                                       rt_uint8_t cintf_nr, struct uac_as_descriptor *as, rt_uint8_t sintf_nr)
+{
+    ac->hdr_desc.baInterfaceNr[0] = sintf_nr;
+#ifdef RT_USB_DEVICE_COMPOSITE
+    ac->iad_desc.bFirstInterface = cintf_nr;
+#endif
+
+    return RT_EOK;
+}
+
+static rt_err_t _uac_samplerate_config(struct uac_as_descriptor *as, rt_uint32_t samplerate)
+{
+    as->format_type_desc.tSamFreq[0][2] = samplerate >> 16 & 0xff;
+    as->format_type_desc.tSamFreq[0][1] = samplerate >> 8 & 0xff;
+    as->format_type_desc.tSamFreq[0][0] = samplerate & 0xff;
+    return RT_EOK;
+}
+
+/**
+ * This function will create a uac function instance.
+ *
+ * @param device the usb device object.
+ *
+ * @return RT_EOK on successful.
+ */
+ufunction_t rt_usbd_function_uac_mic_create(udevice_t device)
+{
+    ufunction_t func;
+    uintf_t intf_ac, intf_as;
+    ualtsetting_t setting_as0;
+    ualtsetting_t setting_ac, setting_as;
+    struct uac_as_descriptor *as_desc_t;
+
+    /* parameter check */
+    RT_ASSERT(device != RT_NULL);
+
+    /* set usb device string description */
+    rt_usbd_device_set_string(device, _ustring);
+
+    /* create a uac function */
+    func = rt_usbd_function_new(device, &dev_desc, &ops);
+    //not support HS
+    //rt_usbd_device_set_qualifier(device, &dev_qualifier);
+
+    /* create interface */
+    intf_ac = rt_usbd_interface_new(device, RT_NULL);
+    intf_as = rt_usbd_interface_new(device, _interface_as_handler);
+
+    /* create alternate setting */
+    setting_ac = rt_usbd_altsetting_new(sizeof(struct uac_ac_descriptor));
+    setting_as0 = rt_usbd_altsetting_new(sizeof(struct uinterface_descriptor));
+    setting_as = rt_usbd_altsetting_new(sizeof(struct uac_as_descriptor));
+    /* config desc in alternate setting */
+    rt_usbd_altsetting_config_descriptor(setting_ac, &ac_desc,
+                                         (rt_off_t) & ((struct uac_ac_descriptor *)0)->intf_desc);
+    rt_usbd_altsetting_config_descriptor(setting_as0, &as_desc0, 0);
+    rt_usbd_altsetting_config_descriptor(setting_as, &as_desc,
+                                         (rt_off_t) & ((struct uac_as_descriptor *)0)->intf_desc);
+    /* configure the uac interface descriptor */
+    _uac_descriptor_config(setting_ac->desc, intf_ac->intf_num, setting_as->desc, intf_as->intf_num);
+    _uac_samplerate_config(setting_as->desc, RECORD_SAMPLERATE);
+
+    /* create endpoint */
+    as_desc_t = (struct uac_as_descriptor *)setting_as->desc;
+    mic.ep = rt_usbd_endpoint_new(&as_desc_t->ep_desc, _ep_data_in_handler);
+
+    /* add the endpoint to the alternate setting */
+    rt_usbd_altsetting_add_endpoint(setting_as, mic.ep);
+
+    /* add the alternate setting to the interface, then set default setting of the interface */
+    rt_usbd_interface_add_altsetting(intf_ac, setting_ac);
+    rt_usbd_set_altsetting(intf_ac, 0);
+    rt_usbd_interface_add_altsetting(intf_as, setting_as0);
+    rt_usbd_interface_add_altsetting(intf_as, setting_as);
+    rt_usbd_set_altsetting(intf_as, 0);
+
+    /* add the interface to the uac function */
+    rt_usbd_function_add_interface(func, intf_ac);
+    rt_usbd_function_add_interface(func, intf_as);
+
+    return func;
+}
+
+int audio_mic_init(void)
+{
+    rt_thread_t mic_tid;
+    mic.event = rt_event_create("mic_event", RT_IPC_FLAG_FIFO);
+
+    mic_tid = rt_thread_create("mic_thread",
+                               mic_entry, RT_NULL,
+                               1024,
+                               5, 10);
+
+    if (mic_tid != RT_NULL)
+        rt_thread_startup(mic_tid);
+    return RT_EOK;
+}
+INIT_COMPONENT_EXPORT(audio_mic_init);
+
+/*
+ *  register uac class
+ */
+struct udclass uac_class =
+{
+    .rt_usbd_function_create = rt_usbd_function_uac_mic_create
+};
+
+int rt_usbd_uac_mic_class_register(void)
+{
+    rt_usbd_class_register(&uac_class);
+    return 0;
+}
+INIT_PREV_EXPORT(rt_usbd_uac_mic_class_register);

components/drivers/usb/usbdevice/class/audio_speaker.c

+/*
+ * Copyright (c) 2006-2019, RT-Thread Development Team
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Change Logs:
+ * Date           Author       Notes
+ * 2019-09-19     flybreak     the first version
+ */
+
+#include <rthw.h>
+#include <rtthread.h>
+#include <rtservice.h>
+#include <rtdevice.h>
+
+#include "drivers/usb_device.h"
+#include "audio.h"
+
+#define DBG_TAG              "usbd.audio.speaker"
+#define DBG_LVL              DBG_INFO
+#include <rtdbg.h>
+
+#define AUDIO_SAMPLERATE   16000
+#define AUDIO_CHANNEL      1
+#define RESOLUTION_BITS    16
+
+#define RESOLUTION_BYTE     (RESOLUTION_BITS / 8)
+#define AUDIO_PER_MS_SZ    ((AUDIO_SAMPLERATE * AUDIO_CHANNEL * RESOLUTION_BYTE) / 1000)
+#define AUDIO_BUFFER_SZ    (AUDIO_PER_MS_SZ * 20)  /* 20ms */
+
+#if defined(RT_USBD_SPEAKER_DEVICE_NAME)
+    #define SPEAKER_DEVICE_NAME    RT_USBD_SPEAKER_DEVICE_NAME
+#else
+    #define SPEAKER_DEVICE_NAME    "sound0"
+#endif
+
+#define EVENT_AUDIO_START   (1 << 0)
+#define EVENT_AUDIO_STOP    (1 << 1)
+#define EVENT_AUDIO_DATA    (1 << 2)
+
+/*
+ * uac speaker descriptor define
+ */
+
+#define UAC_CS_INTERFACE            0x24
+#define UAC_CS_ENDPOINT             0x25
+
+#define UAC_MAX_PACKET_SIZE         64
+#define UAC_EP_MAX_PACKET_SIZE      32
+#define UAC_CHANNEL_NUM             AUDIO_CHANNEL
+#define UAC_INTR_NUM                1
+#define UAC_CH_NUM                  1
+#define UAC_FORMAT_NUM              1
+
+struct uac_ac_descriptor
+{
+#ifdef RT_USB_DEVICE_COMPOSITE
+    struct uiad_descriptor iad_desc;
+#endif
+    struct uinterface_descriptor intf_desc;
+    DECLARE_UAC_AC_HEADER_DESCRIPTOR(UAC_INTR_NUM) hdr_desc;
+    struct uac_input_terminal_descriptor it_desc;
+    struct uac1_output_terminal_descriptor ot_desc;
+#if UAC_USE_FEATURE_UNIT
+    DECLARE_UAC_FEATURE_UNIT_DESCRIPTOR(UAC_CH_NUM) feature_unit_desc;
+#endif
+};
+
+struct uac_as_descriptor
+{
+    struct uinterface_descriptor intf_desc;
+    struct uac1_as_header_descriptor hdr_desc;
+    DECLARE_UAC_FORMAT_TYPE_I_DISCRETE_DESC(UAC_FORMAT_NUM) format_type_desc;
+    struct uendpoint_descriptor ep_desc;
+    struct uac_iso_endpoint_descriptor as_ep_desc;
+};
+
+/*
+ * uac speaker device type
+ */
+
+struct uac_audio_speaker
+{
+    rt_device_t  dev;
+    rt_event_t   event;
+
+    rt_uint8_t  *buffer;
+    rt_uint32_t  buffer_index;
+
+    uep_t        ep;
+};
+static struct uac_audio_speaker speaker;
+
+ALIGN(4)
+static struct udevice_descriptor dev_desc =
+{
+    USB_DESC_LENGTH_DEVICE,     //bLength;
+    USB_DESC_TYPE_DEVICE,       //type;
+    USB_BCD_VERSION,            //bcdUSB;
+    USB_CLASS_DEVICE,           //bDeviceClass;
+    0x00,                       //bDeviceSubClass;
+    0x00,                       //bDeviceProtocol;
+    UAC_MAX_PACKET_SIZE,        //bMaxPacketSize0;
+    _VENDOR_ID,                 //idVendor;
+    _PRODUCT_ID,                //idProduct;
+    USB_BCD_DEVICE,             //bcdDevice;
+    USB_STRING_MANU_INDEX,      //iManufacturer;
+    USB_STRING_PRODUCT_INDEX,   //iProduct;
+    USB_STRING_SERIAL_INDEX,    //iSerialNumber;Unused.
+    USB_DYNAMIC,                //bNumConfigurations;
+};
+
+//FS and HS needed
+ALIGN(4)
+static struct usb_qualifier_descriptor dev_qualifier =
+{
+    sizeof(dev_qualifier),          //bLength
+    USB_DESC_TYPE_DEVICEQUALIFIER,  //bDescriptorType
+    0x0200,                         //bcdUSB
+    USB_CLASS_AUDIO,                //bDeviceClass
+    0x00,                           //bDeviceSubClass
+    0x00,                           //bDeviceProtocol
+    64,                             //bMaxPacketSize0
+    0x01,                           //bNumConfigurations
+    0,
+};
+
+ALIGN(4)
+const static char *_ustring[] =
+{
+    "Language",
+    "RT-Thread Team.",
+    "RT-Thread Speaker",
+    "32021919830108",
+    "Configuration",
+    "Interface",
+};
+
+ALIGN(4)
+static struct uac_ac_descriptor ac_desc =
+{
+#ifdef RT_USB_DEVICE_COMPOSITE
+    /* Interface Association Descriptor */
+    {
+        USB_DESC_LENGTH_IAD,
+        USB_DESC_TYPE_IAD,
+        USB_DYNAMIC,
+        0x02,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOSTREAMING,
+        0x00,
+        0x00,
+    },
+#endif
+    /* Interface Descriptor */
+    {
+        USB_DESC_LENGTH_INTERFACE,
+        USB_DESC_TYPE_INTERFACE,
+        USB_DYNAMIC,
+        0x00,
+        0x00,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOCONTROL,
+        0x00,
+        0x00,
+    },
+    /* Header Descriptor */
+    {
+        UAC_DT_AC_HEADER_SIZE(UAC_INTR_NUM),
+        UAC_CS_INTERFACE,
+        UAC_HEADER,
+        0x0100,    /* Version: 1.00 */
+        0x0027,    /* Total length: 39 */
+        0x01,      /* Total number of interfaces: 1 */
+        {0x01},    /* Interface number: 1 */
+    },
+    /*  Input Terminal Descriptor */
+    {
+        UAC_DT_INPUT_TERMINAL_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_INPUT_TERMINAL,
+        0x01,      /* Terminal ID: 1 */
+        0x0101,    /* Terminal Type: USB Streaming (0x0101) */
+        0x00,      /* Assoc Terminal: 0 */
+        0x01,      /* Number Channels: 1 */
+        0x0000,    /* Channel Config: 0x0000 */
+        0x00,      /* Channel Names: 0 */
+        0x00,      /* Terminal: 0 */
+    },
+    /*  Output Terminal Descriptor */
+    {
+        UAC_DT_OUTPUT_TERMINAL_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_OUTPUT_TERMINAL,
+        0x02,      /* Terminal ID: 2 */
+        0x0302,    /* Terminal Type: Headphones (0x0302) */
+        0x00,      /* Assoc Terminal: 0 */
+        0x01,      /* Source ID: 1 */
+        0x00,      /* Terminal: 0 */
+    },
+#if UAC_USE_FEATURE_UNIT
+    /*  Feature unit Descriptor */
+    {
+        UAC_DT_FEATURE_UNIT_SIZE(UAC_CH_NUM),
+        UAC_CS_INTERFACE,
+        UAC_FEATURE_UNIT,
+        0x02,
+        0x0101,
+        0x00,
+        0x01,
+    },
+#endif
+};
+
+ALIGN(4)
+static struct uinterface_descriptor as_desc0 =
+{
+    USB_DESC_LENGTH_INTERFACE,
+    USB_DESC_TYPE_INTERFACE,
+    USB_DYNAMIC,
+    0x00,
+    0x00,
+    USB_CLASS_AUDIO,
+    USB_SUBCLASS_AUDIOSTREAMING,
+    0x00,
+    0x00,
+};
+
+ALIGN(4)
+static struct uac_as_descriptor as_desc =
+{
+    /* Interface Descriptor */
+    {
+        USB_DESC_LENGTH_INTERFACE,
+        USB_DESC_TYPE_INTERFACE,
+        USB_DYNAMIC,
+        0x01,
+        0x01,
+        USB_CLASS_AUDIO,
+        USB_SUBCLASS_AUDIOSTREAMING,
+        0x00,
+        0x00,
+    },
+    /* General AS Descriptor */
+    {
+        UAC_DT_AS_HEADER_SIZE,
+        UAC_CS_INTERFACE,
+        UAC_AS_GENERAL,
+        0x01,      /* Terminal ID: 1 */
+        0x01,      /* Interface delay in frames: 1 */
+        UAC_FORMAT_TYPE_I_PCM,
+    },
+    /* Format type i Descriptor */
+    {
+        UAC_FORMAT_TYPE_I_DISCRETE_DESC_SIZE(UAC_FORMAT_NUM),
+        UAC_CS_INTERFACE,
+        UAC_FORMAT_TYPE,
+        UAC_FORMAT_TYPE_I,
+        UAC_CHANNEL_NUM,
+        2,         /* Subframe Size: 2 */
+        RESOLUTION_BITS,
+        0x01,      /* Samples Frequence Type: 1 */
+        {0},       /* Samples Frequence */
+    },
+    /* Endpoint Descriptor */
+    {
+        USB_DESC_LENGTH_ENDPOINT,
+        USB_DESC_TYPE_ENDPOINT,
+        USB_DYNAMIC | USB_DIR_OUT,
+        USB_EP_ATTR_ISOC,
+        UAC_EP_MAX_PACKET_SIZE,
+        0x01,
+    },
+    /* AS Endpoint Descriptor */
+    {
+        UAC_ISO_ENDPOINT_DESC_SIZE,
+        UAC_CS_ENDPOINT,
+        UAC_MS_GENERAL,
+    },
+};
+
+void speaker_entry(void *parameter)
+{
+    struct rt_audio_caps caps = {0};
+    rt_uint32_t e, index;
+
+    speaker.buffer = rt_malloc(AUDIO_BUFFER_SZ);
+    if (speaker.buffer == RT_NULL)
+    {
+        LOG_E("malloc failed");
+        goto __exit;
+    }
+
+    speaker.dev = rt_device_find(SPEAKER_DEVICE_NAME);
+    if (speaker.dev == RT_NULL)
+    {
+        LOG_E("can't find device:%s", SPEAKER_DEVICE_NAME);
+        goto __exit;
+    }
+
+    while (1)
+    {
+        if (rt_event_recv(speaker.event, EVENT_AUDIO_START,
+                          RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
+                          1000, &e) != RT_EOK)
+        {
+            continue;
+        }
+        LOG_D("record start");
+
+        rt_device_open(speaker.dev, RT_DEVICE_OFLAG_WRONLY);
+
+        caps.main_type               = AUDIO_TYPE_OUTPUT;
+        caps.sub_type                = AUDIO_DSP_PARAM;
+        caps.udata.config.samplerate = AUDIO_SAMPLERATE;
+        caps.udata.config.channels   = AUDIO_CHANNEL;
+        caps.udata.config.samplebits = RESOLUTION_BITS;
+        rt_device_control(speaker.dev, AUDIO_CTL_CONFIGURE, &caps);
+
+        while (1)
+        {
+            if (rt_event_recv(speaker.event, EVENT_AUDIO_DATA | EVENT_AUDIO_STOP,
+                              RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
+                              1000, &e) != RT_EOK)
+            {
+                continue;
+            }
+            if (e & EVENT_AUDIO_DATA)
+            {
+                index = (speaker.buffer_index >= AUDIO_BUFFER_SZ / 2) ? 0 : (AUDIO_BUFFER_SZ / 2);
+                rt_device_write(speaker.dev, 0, speaker.buffer + index, AUDIO_BUFFER_SZ / 2);
+            }
+            else if (e & EVENT_AUDIO_STOP)
+            {
+                break;
+            }
+        }
+        LOG_D("record stop");
+        rt_device_close(speaker.dev);
+    }
+
+__exit:
+    if (speaker.buffer)
+        rt_free(speaker.buffer);
+}
+
+static rt_err_t _audio_start(ufunction_t func)
+{
+    speaker.ep->request.buffer = speaker.buffer;
+    speaker.ep->request.size = UAC_EP_MAX_PACKET_SIZE;
+    speaker.ep->request.req_type = UIO_REQUEST_READ_FULL;
+    rt_usbd_io_request(func->device, speaker.ep, &speaker.ep->request);
+
+    rt_event_send(speaker.event, EVENT_AUDIO_START);
+
+    return 0;
+}
+
+static rt_err_t _audio_stop(ufunction_t func)
+{
+    rt_event_send(speaker.event, EVENT_AUDIO_STOP);
+    return 0;
+}
+
+static rt_err_t _ep_data_handler(ufunction_t func, rt_size_t size)
+{
+    RT_ASSERT(func != RT_NULL);
+    LOG_D("_ep_data_handler");
+
+    speaker.ep->request.buffer = speaker.buffer + speaker.buffer_index;
+    speaker.ep->request.size = UAC_EP_MAX_PACKET_SIZE;
+    speaker.ep->request.req_type = UIO_REQUEST_READ_FULL;
+    rt_usbd_io_request(func->device, speaker.ep, &speaker.ep->request);
+
+    speaker.buffer_index += UAC_EP_MAX_PACKET_SIZE;
+    if (speaker.buffer_index >= AUDIO_BUFFER_SZ)
+    {
+        speaker.buffer_index = 0;
+        rt_event_send(speaker.event, EVENT_AUDIO_DATA);
+    }
+    else if (speaker.buffer_index == AUDIO_BUFFER_SZ / 2)
+    {
+        rt_event_send(speaker.event, EVENT_AUDIO_DATA);
+    }
+
+    return RT_EOK;
+}
+
+static rt_err_t _interface_as_handler(ufunction_t func, ureq_t setup)
+{
+    RT_ASSERT(func != RT_NULL);
+    RT_ASSERT(func->device != RT_NULL);
+    RT_ASSERT(setup != RT_NULL);
+
+    LOG_D("_interface_as_handler");
+
+    if ((setup->request_type & USB_REQ_TYPE_MASK) == USB_REQ_TYPE_STANDARD)
+    {
+        switch (setup->bRequest)
+        {
+        case USB_REQ_GET_INTERFACE:
+            break;
+        case USB_REQ_SET_INTERFACE:
+            LOG_D("set interface handler");
+            if (setup->wValue == 1)
+            {
+                _audio_start(func);
+            }
+            else if (setup->wValue == 0)
+            {
+                _audio_stop(func);
+            }
+            break;
+        default:
+            LOG_D("unknown uac request 0x%x", setup->bRequest);
+            return -RT_ERROR;
+        }
+    }
+
+    return RT_EOK;
+}
+
+static rt_err_t _function_enable(ufunction_t func)
+{
+    RT_ASSERT(func != RT_NULL);
+
+    LOG_D("uac function enable");
+
+    return RT_EOK;
+}
+
+static rt_err_t _function_disable(ufunction_t func)
+{
+    RT_ASSERT(func != RT_NULL);
+
+    LOG_D("uac function disable");
+    _audio_stop(func);
+    return RT_EOK;
+}
+
+static struct ufunction_ops ops =
+{
+    _function_enable,
+    _function_disable,
+    RT_NULL,
+};
+/**
+ * This function will configure uac descriptor.
+ *
+ * @param comm the communication interface number.
+ * @param data the data interface number.
+ *
+ * @return RT_EOK on successful.
+ */
+static rt_err_t _uac_descriptor_config(struct uac_ac_descriptor *ac,
+                                       rt_uint8_t cintf_nr, struct uac_as_descriptor *as, rt_uint8_t sintf_nr)
+{
+    ac->hdr_desc.baInterfaceNr[0] = sintf_nr;
+#ifdef RT_USB_DEVICE_COMPOSITE
+    ac->iad_desc.bFirstInterface = cintf_nr;
+#endif
+
+    return RT_EOK;
+}
+
+static rt_err_t _uac_samplerate_config(struct uac_as_descriptor *as, rt_uint32_t samplerate)
+{
+    as->format_type_desc.tSamFreq[0][2] = samplerate >> 16 & 0xff;
+    as->format_type_desc.tSamFreq[0][1] = samplerate >> 8 & 0xff;
+    as->format_type_desc.tSamFreq[0][0] = samplerate & 0xff;
+    return RT_EOK;
+}
+
+/**
+ * This function will create a uac function instance.
+ *
+ * @param device the usb device object.
+ *
+ * @return RT_EOK on successful.
+ */
+ufunction_t rt_usbd_function_uac_speaker_create(udevice_t device)
+{
+    ufunction_t func;
+    uintf_t intf_ac, intf_as;
+    ualtsetting_t setting_as0;
+    ualtsetting_t setting_ac, setting_as;
+    struct uac_as_descriptor *as_desc_t;
+
+    /* parameter check */
+    RT_ASSERT(device != RT_NULL);
+
+    /* set usb device string description */
+    rt_usbd_device_set_string(device, _ustring);
+
+    /* create a uac function */
+    func = rt_usbd_function_new(device, &dev_desc, &ops);
+    //not support HS
+    //rt_usbd_device_set_qualifier(device, &dev_qualifier);
+
+    /* create interface */
+    intf_ac = rt_usbd_interface_new(device, RT_NULL);
+    intf_as = rt_usbd_interface_new(device, _interface_as_handler);
+
+    /* create alternate setting */
+    setting_ac = rt_usbd_altsetting_new(sizeof(struct uac_ac_descriptor));
+    setting_as0 = rt_usbd_altsetting_new(sizeof(struct uinterface_descriptor));
+    setting_as = rt_usbd_altsetting_new(sizeof(struct uac_as_descriptor));
+    /* config desc in alternate setting */
+    rt_usbd_altsetting_config_descriptor(setting_ac, &ac_desc,
+                                         (rt_off_t) & ((struct uac_ac_descriptor *)0)->intf_desc);
+    rt_usbd_altsetting_config_descriptor(setting_as0, &as_desc0, 0);
+    rt_usbd_altsetting_config_descriptor(setting_as, &as_desc,
+                                         (rt_off_t) & ((struct uac_as_descriptor *)0)->intf_desc);
+    /* configure the uac interface descriptor */
+    _uac_descriptor_config(setting_ac->desc, intf_ac->intf_num, setting_as->desc, intf_as->intf_num);
+    _uac_samplerate_config(setting_as->desc, AUDIO_SAMPLERATE);
+
+    /* create endpoint */
+    as_desc_t = (struct uac_as_descriptor *)setting_as->desc;
+    speaker.ep = rt_usbd_endpoint_new(&as_desc_t->ep_desc, _ep_data_handler);
+
+    /* add the endpoint to the alternate setting */
+    rt_usbd_altsetting_add_endpoint(setting_as, speaker.ep);
+
+    /* add the alternate setting to the interface, then set default setting of the interface */
+    rt_usbd_interface_add_altsetting(intf_ac, setting_ac);
+    rt_usbd_set_altsetting(intf_ac, 0);
+    rt_usbd_interface_add_altsetting(intf_as, setting_as0);
+    rt_usbd_interface_add_altsetting(intf_as, setting_as);
+    rt_usbd_set_altsetting(intf_as, 0);
+
+    /* add the interface to the uac function */
+    rt_usbd_function_add_interface(func, intf_ac);
+    rt_usbd_function_add_interface(func, intf_as);
+
+    return func;
+}
+
+int audio_speaker_init(void)
+{
+    rt_thread_t speaker_tid;
+    speaker.event = rt_event_create("speaker_event", RT_IPC_FLAG_FIFO);
+
+    speaker_tid = rt_thread_create("speaker_thread",
+                                   speaker_entry, RT_NULL,
+                                   1024,
+                                   5, 10);
+
+    if (speaker_tid != RT_NULL)
+        rt_thread_startup(speaker_tid);
+    return RT_EOK;
+}
+INIT_COMPONENT_EXPORT(audio_speaker_init);
+
+/*
+ *  register uac class
+ */
+static struct udclass uac_speaker_class =
+{
+    .rt_usbd_function_create = rt_usbd_function_uac_speaker_create
+};
+
+int rt_usbd_uac_speaker_class_register(void)
+{
+    rt_usbd_class_register(&uac_speaker_class);
+    return 0;
+}
+INIT_PREV_EXPORT(rt_usbd_uac_speaker_class_register);