```
typedef struct IppAlgoFunc {
int (*Init)(IppAlgoMeta* meta);
int (*Start)();
int (*Flush)();
int (*Process)(IppAlgoBuffer* inBuffer[], int inBufferCount, IppAlgoBuffer* outBuffer, IppAlgoMeta* meta);
int (*Stop)();
} IppAlgoFunc;
```
```
typedef struct IppAlgoBuffer {
void* addr;
unsigned int width;
unsigned int height;
unsigned int stride;
unsigned int size;
int id;
} IppAlgoBuffer;
```
```
long v4l2_compat_ioctl32(struct file *file, unsigned int cmd, unsigned long arg)
{
struct video_device *vdev = video_devdata(file);
long ret = -ENOIOCTLCMD;
if (!file->f_op->unlocked_ioctl)
return ret;
if (_IOC_TYPE(cmd) == 'V' && _IOC_NR(cmd) < BASE_VIDIOC_PRIVATE)
ret = do_video_ioctl(file, cmd, arg);
else if (vdev->fops->compat_ioctl32)
ret = vdev->fops->compat_ioctl32(file, cmd, arg);
```
```
struct v4l2_buffer {
__u32 index;
__u32 type;
__u32 bytesused;
__u32 flags;
__u32 field;
#ifdef __KERNEL__
struct __kernel_v4l2_timeval timestamp;
#else
struct timeval timestamp;
#endif
struct v4l2_timecode timecode;
}
struct __kernel_v4l2_timeval {
long long ._sec;
#if defined(__sparc__) && defined(__arch64__)
int tv_usec;
int __pad;
#else
long long tv_usec;
#endif
};
```
#### H264 关键帧获取上报
H264除了需要上报经过编解码的数据外，还需上报关键帧信息。即这一帧是否为关键帧？mp4编码时需要用到这些信息，那么怎么分析那一帧是关键帧那？主要是分析NALU头信息。Nalu type & 0x1f就代表该帧的类型。Nalu头是以0x00000001或0x000001为起始标志的。 该图为nal_unit_type为不同数值时的帧类型。我们主要关心type为5也就是IDR帧信息。
Ap6275s 是一款SDIO设备WiFi模组驱动，使用标准Linux的SDIO设备驱动。内核模块初始化入口module_init()调用dhd_wifi_platform_load_sdio()函数进行初始化工作，这里调用wifi_platform_set_power()进行GPIO上电，调用dhd_wlan_set_carddetect()进行探测SDIO设备卡，最后调用sdio_register_driver(&bcmsdh_sdmmc_driver);进行SDIO设备驱动的注册，SDIO总线已经检测到WiFi模块设备 根据设备号和厂商号与该设备驱动匹配, 所以立即回调该驱动的bcmsdh_sdmmc_probe()函数，这里进行WiFi模组芯片的初始化工作，最后创建net_device网络接口wlan0，然后注册到Linux内核协议栈中。
l 创建net_device网络接口wlan0对象
dhd_allocate_if()会调用alloc_etherdev()创建net_device对象，即wlan0网络接口。
l 将wlan0注册到内核协议栈
调用dhd_register_if()函数，这里调用register_netdev(net);将wlan0网络接口注册到协议栈。
```c
typedef struct {
/**
* Set to sizeof(bt_vendor_interface_t)
*/
size_t size;
/**
* Caller will open the interface and pass in the callback routines
* to the implementation of this interface.
*/
int (*init)(const bt_vendor_callbacks_t* p_cb, unsigned char* local_bdaddr);
/**
* Vendor specific operations
*/
int (*op)(bt_opcode_t opcode, void* param);
/**
* Closes the interface
*/
void (*close)(void);
} bt_vendor_interface_t;
```
```c
static int init(const bt_vendor_callbacks_t *p_cb, unsigned char *local_bdaddr)
{
/* * ... */
userial_vendor_init();
upio_init();
vnd_load_conf(VENDOR_LIB_CONF_FILE);
/* store reference to user callbacks */
bt_vendor_cbacks = (bt_vendor_callbacks_t *)p_cb;
/* This is handed over from the stack */
return memcpy_s(vnd_local_bd_addr, BD_ADDR_LEN, local_bdaddr, BD_ADDR_LEN);
}
```
```c
static int HciInitHal()
{
int result = BT_NO_ERROR;
g_waitHdiInit = SemaphoreCreate(0);
int ret = g_hdiLib->hdiInit(&g_hdiCallbacks);
if (ret == SUCCESS) {
SemaphoreWait(g_waitHdiInit);
}
}
```
```c
/* define callback of the cmd_xmit_cb
*
The callback function which HCI lib will call with the return of command
complete packet. Vendor lib is responsible for releasing the buffer passed
in at the p_mem parameter by calling dealloc callout function.
*/
typedef void (*tINT_CMD_CBACK)(void* p_mem);
typedef uint8_t (*cmd_xmit_cb)(uint16_t opcode, void* p_buf, tINT_CMD_CBACK p_cback);
```
OHOS：
```c
/**
hci command packet transmit callback
Vendor lib calls cmd_xmit_cb function in order to send a HCI Command
packet to BT Controller.
*
The opcode parameter gives the HCI OpCode (combination of OGF and OCF) of
HCI Command packet. For example, opcode = 0x0c03 for the HCI_RESET command
packet. */
typedef uint8_t (*cmd_xmit_callback)(uint16_t opcode, void* p_buf);
```
eliverBuffer(std::shared_ptr<IBuffer>& buffer)
ow-level */
WM_BL",