在Tizen中打开相机并拍照

在Tizen平台下使用相机API打开相机，并实现拍照功能。

#include <camera.h>

static char *file_path = "/opt/usr/media/Downloads/camera.jpg";

void camera_start_preview(void)
{
   camera_h camera;
   camera_error_e ret;
   camera_image_resolution_t resolution;
   camera_display_t  *display;

   ret = camera_create(CAMERA_DEVICE_CAMERA0, &camera);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_create failed.");
      return;
   }

   ret = camera_foreach_supported_preview_resolution(camera, _supported_preview_resolution_cb, &resolution);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_foreach_supported_preview_resolution failed.");
      camera_destroy(camera);
      return;
   }

   ret = camera_set_display_mode(camera, CAMERA_DISPLAY_MODE_LETTER_BOX);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_set_display_mode failed.");
      camera_destroy(camera);
      return;
   }

   ret = camera_start_preview(camera);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_start_preview failed.");
      camera_destroy(camera);
      return;
   }

   ret = camera_get_display(camera, &display);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_get_display failed.");
      camera_stop_preview(camera);
      camera_destroy(camera);
      return;
   }

   camera_image_quality_e quality;
   ret = camera_get_preview_quality(camera, &quality);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_get_preview_quality failed.");
   }

   ret = camera_capture(camera, true, _preview_capture_completed_cb, quality, file_path);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_capture failed.");
      camera_destroy(camera);
      return;
   }
}

static bool _supported_preview_resolution_cb(camera_image_resolution_t *resolution, void *user_data)
{
  camera_image_resolution_t *dest = (camera_image_resolution_t *)user_data;
  if (!dest) {
      return true;
  }

  if (resolution->width >= dest->width) {
     dest->width = resolution->width;
     dest->height = resolution->height;
  }

  return true;
}

static void _preview_capture_completed_cb(void *user_data)
{
   dlog_print(DLOG_DEBUG, "CAMERA_TEST", "capture completed.");
}

void camera_stop_preview(camera_h camera)
{
   camera_error_e ret = camera_stop_preview(camera);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_stop_preview failed.");
      return;
   }

   ret = camera_destroy(camera);
   if (CAMERA_ERROR_NONE != ret) {
      dlog_print(DLOG_ERROR, "CAMERA_TEST", "camera_destroy failed.");
      return;
   }
}

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