linux-4.4.1/uvc_buffer_prepare()

参照元†

linux-4.4.1/uvc_queue_qops(global)

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説明†

パス: linux-4.4.1/drivers/media/usb/uvc/uvc_queue.c

FIXME: これは何？
- 説明

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引数†

struct vb2_buffer *vb
- linux-4.4.1/vb2_buffer

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返り値†

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参考†

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実装†

static int uvc_buffer_prepare(struct vb2_buffer *vb)
{
        struct vb2_v4l2_buffer *vbuf = to_vb2_v4l2_buffer(vb);
        struct uvc_video_queue *queue = vb2_get_drv_priv(vb->vb2_queue);
        struct uvc_buffer *buf = container_of(vbuf, struct uvc_buffer, buf);

        if (vb->type == V4L2_BUF_TYPE_VIDEO_OUTPUT &&
            vb2_get_plane_payload(vb, 0) > vb2_plane_size(vb, 0)) {
                uvc_trace(UVC_TRACE_CAPTURE, "[E] Bytes used out of bounds.\n");
                return -EINVAL;
        }

        if (unlikely(queue->flags & UVC_QUEUE_DISCONNECTED))
                return -ENODEV;

- linux-4.4.1/unlikely()

        buf->state = UVC_BUF_STATE_QUEUED;
        buf->error = 0;
        buf->mem = vb2_plane_vaddr(vb, 0);
        buf->length = vb2_plane_size(vb, 0);
        if (vb->type == V4L2_BUF_TYPE_VIDEO_CAPTURE)
                buf->bytesused = 0;
        else
                buf->bytesused = vb2_get_plane_payload(vb, 0);

        return 0;
}

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linux-4.4.1/uvc_buffer_prepare()

参照元†

説明†

引数†

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参考†

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