Feat sscma camera (#770)

* feat: add sscma camera

* fix: 修复sscma camera 无法使用等问题

* feat: update README.md

* style: optimize styles

* style: fix styles

* Update sscma_camera.h

---------

Co-authored-by: Xiaoxia <terrence@tenclass.com>

main/boards/sensecap-watcher/sscma_camera.h

@@ -0,0 +1,50 @@
+#ifndef SSCMA_CAMERA_H
+#define SSCMA_CAMERA_H
+
+#include <lvgl.h>
+#include <thread>
+#include <memory>
+
+#include <freertos/FreeRTOS.h>
+#include <freertos/queue.h>
+#include <esp_io_expander_tca95xx_16bit.h>
+#include <esp_jpeg_dec.h>
+#include <mbedtls/base64.h>
+
+#include "sscma_client.h"
+#include "camera.h"
+
+struct SscmaData {
+    uint8_t* img;
+    size_t len;
+};
+struct JpegData {
+    uint8_t* buf;
+    size_t len;
+};
+
+class SscmaCamera : public Camera {
+private:
+    lv_img_dsc_t preview_image_;
+    std::string explain_url_;
+    std::string explain_token_;
+    sscma_client_io_handle_t sscma_client_io_handle_;
+    sscma_client_handle_t sscma_client_handle_;
+    QueueHandle_t sscma_data_queue_;
+    JpegData jpeg_data_;
+    jpeg_dec_handle_t *jpeg_dec_;
+    jpeg_dec_io_t *jpeg_io_;
+    jpeg_dec_header_info_t *jpeg_out_;
+public:
+    SscmaCamera(esp_io_expander_handle_t io_exp_handle);
+    ~SscmaCamera();
+
+    virtual void SetExplainUrl(const std::string& url, const std::string& token);
+    virtual bool Capture();
+    // 翻转控制函数
+    virtual bool SetHMirror(bool enabled) override;
+    virtual bool SetVFlip(bool enabled) override;
+    virtual std::string Explain(const std::string& question);
+};
+
+#endif // ESP32_CAMERA_H