video_i2c_buffer
struct video_i2c_buffer *buf =
container_of(vbuf, struct video_i2c_buffer, vb);
struct video_i2c_buffer *vid_cap_buf = NULL;
struct video_i2c_buffer, list);
struct video_i2c_buffer *buf, *tmp;
queue->buf_struct_size = sizeof(struct video_i2c_buffer);