Camera: Add getFrameInterval() API

Add getFrameInterval() API to get frame interval.
sonydevworld · Mar 18, 2022 · 0ed9f9e · 0ed9f9e
1 parent 78159bf
commit 0ed9f9e
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diff --git a/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/Camera.cpp b/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/Camera.cpp
@@ -1185,6 +1185,31 @@ int CameraClass::getJPEGQuality(void)
                         V4L2_CID_JPEG_COMPRESSION_QUALITY);
 }
 
+// Public : frame interval
+int CameraClass::getFrameInterval(void)
+{
+  struct v4l2_streamparm param = {0};
+  struct v4l2_fract *interval = &param.parm.capture.timeperframe;
+
+  if (is_device_ready())
+    {
+      param.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
+
+      if (ioctl(video_fd, VIDIOC_G_PARM, (unsigned long)&param) < 0)
+        {
+          return convert_errno2camerr(errno);
+        }
+
+      /* Convert fraction to value with 100usec unit. */
+
+      return interval->numerator * 10000 / interval->denominator;
+    }
+  else
+    {
+      return CAM_ERR_NOT_INITIALIZED;
+    }
+}
+
 // Public : Still Picture Format.
 CamErr CameraClass::setStillPictureImageFormat(int img_width, int img_height, CAM_IMAGE_PIX_FMT img_fmt,
                                                int jpgbufsize_divisor)

diff --git a/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/Camera.h b/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/Camera.h
@@ -773,6 +773,16 @@ class CameraClass {
    */
   int getJPEGQuality(void);
 
+  /**
+   * @brief Get frame interval
+   * @details [en] Get frame interval in 100usec units.  <BR>
+   *          [ja] フレーム間隔(100usec単位)を取得する。
+   *
+   * @return [en] Frame interval in 100usec units or error code defined as #CamErr. <BR>
+   *         [ja] フレーム間隔(100usec単位) もしくは、#CamErrで定義されているエラーコード。
+   */
+  int getFrameInterval(void);
+
   /**
    * @brief Set Still Picture Image format parameters.
    * @details [en] Set Still Picture Image format. <BR>

diff --git a/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/keywords.txt b/Arduino15/packages/SPRESENSE/hardware/spresense/1.0.0/libraries/Camera/keywords.txt
@@ -32,6 +32,7 @@ getAbsoluteExposure        KEYWORD2
 getHDR                     KEYWORD2
 getISOSensitivity          KEYWORD2
 getJPEGQuality             KEYWORD2
+getFrameInterval           KEYWORD2
 setStillPictureImageFormat KEYWORD2
 takePicture                KEYWORD2
 getDeviceType              KEYWORD2