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?拿到这个板子之后，第一件事就是好奇这个板子还有几个引脚可以让我来使用？
看看代码中定义了几个引脚：
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SIOD_GPIO_NUM 26
#define SIOC_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22
这里只定义了15个引脚。
const int resolution[][2] = {
{ 160, 120 }, /* QQVGA */
{ 128, 160 }, /* QQVGA2*/
{ 176, 144 }, /* QCIF */
{ 240, 176 }, /* HQVGA */
{ 320, 240 }, /* QVGA */
{ 400, 296 }, /* CIF */
{ 640, 480 }, /* VGA */
{ 800, 600 }, /* SVGA */
{ 1024, 768 }, /* XGA */
{ 1280, 1024 }, /* SXGA */
{ 1600, 1200 }, /* UXGA */
{ 2048, 1536 }, /* QXGA */
};
摄像头OV2640的资料：https://wiki.ai-thinker.com/media/esp32/docs/ov2640_ds_1.8.pdf
使用最小的QQVGA（160*120）–（2450Byte/25fps）大概100Byte每帧。
MJPG: 2449B 41ms (24.4fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0
MJPG: 2456B 38ms (26.3fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0
MJPG: 2451B 39ms (25.6fps), AVG: 39ms (25.6fps), 0+0+0+0=0 0
使用最大的UXGA（1600*1200）-- （84500Byte/4fps）大概21125Byte每帧。
MJPG: 84369B 351ms (2.8fps), AVG: 263ms (3.8fps), 0+0+0+0=0 0
MJPG: 84407B 259ms (3.9fps), AVG: 272ms (3.7fps), 0+0+0+0=0 0
MJPG: 84208B 247ms (4.0fps), AVG: 262ms (3.8fps), 0+0+0+0=0 0
效果图：
实现代码：
#include <WiFi.h>
#include "esp_http_server.h"
#include "esp_camera.h"
#include "esp_timer.h"
#include "dl_lib.h"
const char* ssid = "liefyuan";
const char* password = "1234567890";
#define PWDN_GPIO_NUM 32
#define RESET_GPIO_NUM -1
#define XCLK_GPIO_NUM 0
#define SIOD_GPIO_NUM 26
#define SIOC_GPIO_NUM 27
#define Y9_GPIO_NUM 35
#define Y8_GPIO_NUM 34
#define Y7_GPIO_NUM 39
#define Y6_GPIO_NUM 36
#define Y5_GPIO_NUM 21
#define Y4_GPIO_NUM 19
#define Y3_GPIO_NUM 18
#define Y2_GPIO_NUM 5
#define VSYNC_GPIO_NUM 25
#define HREF_GPIO_NUM 23
#define PCLK_GPIO_NUM 22
#define PART_BOUNDARY "123456789000000000000987654321"
static const char* _STREAM_CONTENT_TYPE = "multipart/x-mixed-replace;boundary=" PART_BOUNDARY;
static const char* _STREAM_BOUNDARY = "\r\n--" PART_BOUNDARY "\r\n";
static const char* _STREAM_PART = "Content-Type: image/jpeg\r\nContent-Length: %u\r\n\r\n";
typedef struct {
size_t size; //number of values used for filtering
size_t index; //current value index
size_t count; //value count
int sum;
int * values; //array to be filled with values
} ra_filter_t;
httpd_handle_t stream_httpd = NULL;
httpd_handle_t camera_httpd = NULL;
static ra_filter_t ra_filter;
static int ra_filter_run(ra_filter_t * filter, int value){
if(!filter->values){
return value;
}
filter->sum -= filter->values[filter->index];
filter->values[filter->index] = value;
filter->sum += filter->values[filter->index];
filter->index++;
filter->index = filter->index % filter->size;
if (filter->count < filter->size) {
filter->count++;
}
return filter->sum / filter->count;
}
static esp_err_t stream_handler(httpd_req_t *req){
camera_fb_t * fb = NULL;
esp_err_t res = ESP_OK;
size_t _jpg_buf_len = 0;
uint8_t * _jpg_buf = NULL;
char * part_buf[64];
dl_matrix3du_t *image_matrix = NULL;
bool detected = false;
int face_id = 0;
int64_t fr_start = 0;
int64_t fr_ready = 0;
int64_t fr_face = 0;
int64_t fr_recognize = 0;
int64_t fr_encode = 0;
static int64_t last_frame = 0;
if(!last_frame) {
last_frame = esp_timer_get_time();
}
res = httpd_resp_set_type(req, _STREAM_CONTENT_TYPE);
if(res != ESP_OK){
return res;
}
while(true){
detected = false;
face_id = 0;
sensor_t * s = esp_camera_sensor_get();
s->set_vflip(s, 1);
fb = esp_camera_fb_get();
if (!fb) {
Serial.println("Camera capture failed");
res = ESP_FAIL;
} else {
fr_start = esp_timer_get_time();
_jpg_buf_len = fb->len;
_jpg_buf = fb->buf;
}
if(res == ESP_OK){
size_t hlen = snprintf((char *)part_buf, 64, _STREAM_PART, _jpg_buf_len);
res = httpd_resp_send_chunk(req, (const char *)part_buf, hlen);
}
if(res == ESP_OK){
res = httpd_resp_send_chunk(req, (const char *)_jpg_buf, _jpg_buf_len);
}
if(res == ESP_OK){
res = httpd_resp_send_chunk(req, _STREAM_BOUNDARY, strlen(_STREAM_BOUNDARY));
}
if(fb){
esp_camera_fb_return(fb);
fb = NULL;
_jpg_buf = NULL;
} else if(_jpg_buf){
free(_jpg_buf);
_jpg_buf = NULL;
}
if(res != ESP_OK){
break;
}
int64_t fr_end = esp_timer_get_time();
int64_t ready_time = (fr_ready - fr_start)/1000;
int64_t face_time = (fr_face - fr_ready)/1000;
int64_t recognize_time = (fr_recognize - fr_face)/1000
