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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: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Mauro Carvalho Chehab 2009-06-25 16:28:23 -03:00
parent 8e4a718ff3
commit c285addb39
1 changed files with 50 additions and 49 deletions
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99
drivers/media/video/vivi.c
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@ -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)