v4l2: Implement exynos_v4l2_prepare

This is needed for recent Samsung camera HALs. Change-Id: I800b1aca043bf80d0c60edeba33de19df84ea8cb
LineageOS · Aug 14, 2017 · 0bc62e7 · 0bc62e7
1 parent 7b67ee6
commit 0bc62e7
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diff --git a/include/exynos_v4l2.h b/include/exynos_v4l2.h
@@ -94,6 +94,8 @@ int exynos_v4l2_s_parm(int fd, struct v4l2_streamparm *streamparm);
 int exynos_v4l2_g_ext_ctrl(int fd, struct v4l2_ext_controls *ctrl);
 /*! \ingroup exynos_v4l2 */
 int exynos_v4l2_s_ext_ctrl(int fd, struct v4l2_ext_controls *ctrl);
+/*! \ingroup exynos_v4l2 */
+int exynos_v4l2_prepare(int fd, struct v4l2_buffer *buf);
 
 /* V4L2_SUBDEV */
 #include <linux/v4l2-subdev.h>

diff --git a/libv4l2/exynos_v4l2.c b/libv4l2/exynos_v4l2.c
@@ -866,3 +866,28 @@ int exynos_v4l2_s_ext_ctrl(int fd, struct v4l2_ext_controls *ctrl)
 
     return ret;
 }
+
+int exynos_v4l2_prepare(int fd, struct v4l2_buffer *buf)
+{
+    int ret = -1;
+
+    Exynos_v4l2_In();
+
+    if (fd < 0) {
+        ALOGE("%s: invalid fd: %d", __func__, fd);
+        return ret;
+    }
+
+    if (!buf) {
+        ALOGE("%s: buf is NULL", __func__);
+        return ret;
+    }
+
+    ret = ioctl(fd, VIDIOC_PREPARE_BUF, buf);
+    if (ret)
+        ALOGE("failed to ioctl: VIDIOC_PREPARE_BUF (%d - %s)", errno, strerror(errno));
+
+    Exynos_v4l2_Out();
+
+    return ret;
+}