linux-4.4.1/uvc_queue_setup()

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_queue *vq
- linux-4.4.1/vb2_queue
const void *parg
unsigned int *nbuffers
unsigned int *nplanes
unsigned int sizes[]
void *alloc_ctxs[]

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返り値†

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参考†

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実装†

static int uvc_queue_setup(struct vb2_queue *vq, const void *parg,
                           unsigned int *nbuffers, unsigned int *nplanes,
                           unsigned int sizes[], void *alloc_ctxs[])
{
        const struct v4l2_format *fmt = parg;
        struct uvc_video_queue *queue = vb2_get_drv_priv(vq);
        struct uvc_streaming *stream = uvc_queue_to_stream(queue);

        /* Make sure the image size is large enough. */
        if (fmt && fmt->fmt.pix.sizeimage < stream->ctrl.dwMaxVideoFrameSize)
                return -EINVAL;

        *nplanes = 1;

        sizes[0] = fmt ? fmt->fmt.pix.sizeimage
                 : stream->ctrl.dwMaxVideoFrameSize;

        return 0;
}

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