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rt-thread-official/components/drivers/usb/usbdevice/class/audio_mic.c

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/*
* Copyright (c) 2006-2023, 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 <rtdevice.h>
#include "drivers/usb_device.h"
#include "uaudioreg.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)
#define MIC_INTF_STR_INDEX 8
/*
* 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
struct uac_ac_descriptor
{
#ifdef RT_USB_DEVICE_COMPOSITE
struct uiad_descriptor iad_desc;
#endif
struct uinterface_descriptor intf_desc;
struct usb_audio_control_descriptor hdr_desc;
struct usb_audio_input_terminal it_desc;
struct usb_audio_output_terminal ot_desc;
#if UAC_USE_FEATURE_UNIT
struct usb_audio_feature_unit feature_unit_desc;
#endif
};
struct uac_as_descriptor
{
struct uinterface_descriptor intf_desc;
struct usb_audio_streaming_interface_descriptor hdr_desc;
struct usb_audio_streaming_type1_descriptor format_type_desc;
struct uendpoint_descriptor ep_desc;
struct usb_audio_streaming_endpoint_descriptor as_ep_desc;
};
/*
* uac mic device type
*/
struct uac_audio_mic
{
rt_device_t dev;
rt_event_t event;
rt_uint8_t open_count;
rt_uint8_t *buffer;
rt_uint32_t buffer_index;
uep_t ep;
};
static struct uac_audio_mic mic;
rt_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
rt_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,
};
rt_align(4)
const static char *_ustring[] =
{
"Language",
"RT-Thread Team.",
"RT-Thread Audio Microphone",
"32021919830108",
"Configuration",
"Interface",
};
rt_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,
#ifdef RT_USB_DEVICE_COMPOSITE
MIC_INTF_STR_INDEX,
#else
0x00,
#endif
},
/* Header Descriptor */
{
sizeof(struct usb_audio_control_descriptor),
UAC_CS_INTERFACE,
UDESCSUB_AC_HEADER,
0x0100, /* Version: 1.00 */
0x001E, /* Total length: 30 */
0x01, /* Total number of interfaces: 1 */
{0x01}, /* Interface number: 1 */
},
/* Input Terminal Descriptor */
{
sizeof(struct usb_audio_input_terminal),
UAC_CS_INTERFACE,
UDESCSUB_AC_INPUT,
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 */
{
sizeof(struct usb_audio_output_terminal),
UAC_CS_INTERFACE,
UDESCSUB_AC_OUTPUT,
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 */
{
sizeof(struct usb_audio_feature_unit),
UAC_CS_INTERFACE,
UDESCSUB_AC_FEATURE,
0x02,
0x01,
0x01,
0x00,
0x01,
},
#endif
};
rt_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,
};
rt_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 */
{
sizeof(struct usb_audio_streaming_interface_descriptor),
UAC_CS_INTERFACE,
AS_GENERAL,
0x02, /* Terminal ID: 2 */
0x01, /* Interface delay in frames: 1 */
UA_FMT_PCM,
},
/* Format type i Descriptor */
{
sizeof(struct usb_audio_streaming_type1_descriptor),
UAC_CS_INTERFACE,
FORMAT_TYPE,
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 */
{
sizeof(struct usb_audio_streaming_endpoint_descriptor),
UAC_CS_ENDPOINT,
AS_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 | EVENT_RECORD_STOP,
RT_EVENT_FLAG_OR | RT_EVENT_FLAG_CLEAR,
1000, &e) != RT_EOK)
{
continue;
}
if (mic.open_count == 0)
{
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)
{
if (mic.open_count > 0)
continue;
else
break;
}
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);
mic.open_count ++;
rt_event_send(mic.event, EVENT_RECORD_START);
return 0;
}
static rt_err_t _record_stop(ufunction_t func)
{
mic.open_count --;
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 * 3 + 2] = samplerate >> 16 & 0xff;
as->format_type_desc.tSamFreq[0 * 3 + 1] = samplerate >> 8 & 0xff;
as->format_type_desc.tSamFreq[0 * 3 + 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);
#ifdef RT_USB_DEVICE_COMPOSITE
rt_usbd_device_set_interface_string(device, MIC_INTF_STR_INDEX, _ustring[2]);
#else
/* set usb device string description */
rt_usbd_device_set_string(device, _ustring);
#endif
/* 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);
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