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Commit c285addb authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
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V4L/DVB (12134): vivi: bug: don't assume that S_STD will be called before streaming 



precalculate_bars() improved vivi performance. However, it assumed that
always before streaming, the driver would call VIDIOC_S_STD. This is not
an API requirement, and the testing apps don't do that.

Due to that, a regression were caused by the patch that added it.

This patch moves the precalculate_bars to the proper place of the code,
calling it at buffer_prepare() callback.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@redhat.com>
parent 8e4a718f

drivers/media/video/vivi.c

+50 −49
Original line number Diff line number Diff line
@@ -343,6 +343,53 @@ static struct bar_std bars[] = { 
#define TO_U(r, g, b) \

	(((-9714 * r - 19070 * g + 28784 * b + 32768) >> 16) + 128)



/* precalculate color bar values to speed up rendering */

static void precalculate_bars(struct vivi_fh *fh)

{

	struct vivi_dev *dev = fh->dev;

	unsigned char r, g, b;

	int k, is_yuv;



	fh->input = dev->input;



	for (k = 0; k < 8; k++) {

		r = bars[fh->input].bar[k][0];

		g = bars[fh->input].bar[k][1];

		b = bars[fh->input].bar[k][2];

		is_yuv = 0;



		switch (fh->fmt->fourcc) {

		case V4L2_PIX_FMT_YUYV:

		case V4L2_PIX_FMT_UYVY:

			is_yuv = 1;

			break;

		case V4L2_PIX_FMT_RGB565:

		case V4L2_PIX_FMT_RGB565X:

			r >>= 3;

			g >>= 2;

			b >>= 3;

			break;

		case V4L2_PIX_FMT_RGB555:

		case V4L2_PIX_FMT_RGB555X:

			r >>= 3;

			g >>= 3;

			b >>= 3;

			break;

		}



		if (is_yuv) {

			fh->bars[k][0] = TO_Y(r, g, b);	/* Luma */

			fh->bars[k][1] = TO_U(r, g, b);	/* Cb */

			fh->bars[k][2] = TO_V(r, g, b);	/* Cr */

		} else {

			fh->bars[k][0] = r;

			fh->bars[k][1] = g;

			fh->bars[k][2] = b;

		}

	}



}



#define TSTAMP_MIN_Y	24

#define TSTAMP_MAX_Y	(TSTAMP_MIN_Y + 15)

#define TSTAMP_INPUT_X	10
@@ -755,6 +802,8 @@ buffer_prepare(struct videobuf_queue *vq, struct videobuf_buffer *vb, 
	buf->vb.height = fh->height;

	buf->vb.field  = field;



	precalculate_bars(fh);



	if (VIDEOBUF_NEEDS_INIT == buf->vb.state) {

		rc = videobuf_iolock(vq, &buf->vb, NULL);

		if (rc < 0)
@@ -893,53 +942,6 @@ static int vidioc_try_fmt_vid_cap(struct file *file, void *priv, 
	return 0;

}



/* precalculate color bar values to speed up rendering */

static void precalculate_bars(struct vivi_fh *fh)

{

	struct vivi_dev *dev = fh->dev;

	unsigned char r, g, b;

	int k, is_yuv;



	fh->input = dev->input;



	for (k = 0; k < 8; k++) {

		r = bars[fh->input].bar[k][0];

		g = bars[fh->input].bar[k][1];

		b = bars[fh->input].bar[k][2];

		is_yuv = 0;



		switch (fh->fmt->fourcc) {

		case V4L2_PIX_FMT_YUYV:

		case V4L2_PIX_FMT_UYVY:

			is_yuv = 1;

			break;

		case V4L2_PIX_FMT_RGB565:

		case V4L2_PIX_FMT_RGB565X:

			r >>= 3;

			g >>= 2;

			b >>= 3;

			break;

		case V4L2_PIX_FMT_RGB555:

		case V4L2_PIX_FMT_RGB555X:

			r >>= 3;

			g >>= 3;

			b >>= 3;

			break;

		}



		if (is_yuv) {

			fh->bars[k][0] = TO_Y(r, g, b);	/* Luma */

			fh->bars[k][1] = TO_U(r, g, b);	/* Cb */

			fh->bars[k][2] = TO_V(r, g, b);	/* Cr */

		} else {

			fh->bars[k][0] = r;

			fh->bars[k][1] = g;

			fh->bars[k][2] = b;

		}

	}



}



/*FIXME: This seems to be generic enough to be at videodev2 */

static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,

					struct v4l2_format *f)
@@ -965,8 +967,6 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv, 
	fh->vb_vidq.field = f->fmt.pix.field;

	fh->type          = f->type;



	precalculate_bars(fh);



	ret = 0;

out:

	mutex_unlock(&q->vb_lock);
@@ -1357,6 +1357,7 @@ static int __init vivi_create_instance(int inst) 
		goto unreg_dev;



	*vfd = vivi_template;

	vfd->debug = debug;



	ret = video_register_device(vfd, VFL_TYPE_GRABBER, video_nr);

	if (ret < 0)