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[media] stk1160: Add frame scaling support 

This commit implements frame decimation for stk1160, which allows
to support format changes instead of a static frame size.

The stk1160 supports independent row and column decimation, in two
different modes:
 * set a number of rows/columns units to skip for each unit sent.
 * set a number of rows/columns units to send for each unit skipped.

This effectively allows to achieve different frame scaling ratios.

The unit number can be set to either two row/columns sent/skipped,
or four row/columns sent/skipped. Since the video format (UYVY)
has 4-bytes, using a unit number of two row/columns results
in frame color 'shifting', so set to four row/columns sent/skipped.

Signed-off-by: Michael Stegemann <michael@stegemann.it>
Signed-off-by: Dale Hamel <dale.hamel@srvthe.net>
Signed-off-by: Ezequiel Garcia <ezequiel@vanguardiasur.com.ar>
Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Ezequiel Garcia 2015-07-03 16:11:42 -03:00 committed by Mauro Carvalho Chehab
parent 890024ad14
commit d3194520e2
2 changed files with 211 additions and 32 deletions
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34
drivers/media/usb/stk1160/stk1160-reg.h
View File

@ -33,6 +33,40 @@
*/
#define STK1160_DCTRL 0x100
/*
* Decimation Control Register:
* Byte 104: Horizontal Decimation Line Unit Count
* Byte 105: Vertical Decimation Line Unit Count
* Byte 106: Decimation Control
* Bit 0 - Horizontal Decimation Control
* 0 Horizontal decimation is disabled.
* 1 Horizontal decimation is enabled.
* Bit 1 - Decimates Half or More Column
* 0 Decimates less than half from original column,
* send count unit (0x105) before each unit skipped.
* 1 Decimates half or more from original column,
* skip count unit (0x105) before each unit sent.
* Bit 2 - Vertical Decimation Control
* 0 Vertical decimation is disabled.
* 1 Vertical decimation is enabled.
* Bit 3 - Vertical Greater or Equal to Half
* 0 Decimates less than half from original row,
* send count unit (0x105) before each unit skipped.
* 1 Decimates half or more from original row,
* skip count unit (0x105) before each unit sent.
* Bit 4 - Decimation Unit
* 0 Decimation will work with 2 rows or columns per unit.
* 1 Decimation will work with 4 rows or columns per unit.
*/
#define STK1160_DMCTRL_H_UNITS 0x104
#define STK1160_DMCTRL_V_UNITS 0x105
#define STK1160_DMCTRL 0x106
#define STK1160_H_DEC_EN BIT(0)
#define STK1160_H_DEC_MODE BIT(1)
#define STK1160_V_DEC_EN BIT(2)
#define STK1160_V_DEC_MODE BIT(3)
#define STK1160_DEC_UNIT_SIZE BIT(4)
/* Capture Frame Start Position */
#define STK116_CFSPO 0x110
#define STK116_CFSPO_STX_L 0x110

209
drivers/media/usb/stk1160/stk1160-v4l.c
View File

@ -42,6 +42,17 @@ static bool keep_buffers;
module_param(keep_buffers, bool, 0644);
MODULE_PARM_DESC(keep_buffers, "don't release buffers upon stop streaming");
enum stk1160_decimate_mode {
STK1160_DECIMATE_MORE_THAN_HALF,
STK1160_DECIMATE_LESS_THAN_HALF,
};
struct stk1160_decimate_ctrl {
bool col_en, row_en;
enum stk1160_decimate_mode col_mode, row_mode;
unsigned int col_n, row_n;
};
/* supported video standards */
static struct stk1160_fmt format[] = {
{
@ -51,6 +62,19 @@ static struct stk1160_fmt format[] = {
}
};
/*
* Helper to find the next divisor that results in modulo being zero.
* This is required to guarantee valid decimation unit counts.
*/
static unsigned int
div_round_integer(unsigned int x, unsigned int y)
{
for (;; y++) {
if (x % y == 0)
return x / y;
}
}
static void stk1160_set_std(struct stk1160 *dev)
{
int i;
@ -106,6 +130,41 @@ static void stk1160_set_std(struct stk1160 *dev)
}
static void stk1160_set_fmt(struct stk1160 *dev,
struct stk1160_decimate_ctrl *ctrl)
{
u32 val = 0;
if (ctrl) {
/*
* Since the format is UYVY, the device must skip or send
* a number of rows/columns multiple of four. This way, the
* colour format is preserved. The STK1160_DEC_UNIT_SIZE bit
* does exactly this.
*/
val |= STK1160_DEC_UNIT_SIZE;
val |= ctrl->col_en ? STK1160_H_DEC_EN : 0;
val |= ctrl->row_en ? STK1160_V_DEC_EN : 0;
val |= ctrl->col_mode ==
STK1160_DECIMATE_MORE_THAN_HALF ?
STK1160_H_DEC_MODE : 0;
val |= ctrl->row_mode ==
STK1160_DECIMATE_MORE_THAN_HALF ?
STK1160_V_DEC_MODE : 0;
/* Horizontal count units */
stk1160_write_reg(dev, STK1160_DMCTRL_H_UNITS, ctrl->col_n);
/* Vertical count units */
stk1160_write_reg(dev, STK1160_DMCTRL_V_UNITS, ctrl->row_n);
stk1160_dbg("decimate 0x%x, column units %d, row units %d\n",
val, ctrl->col_n, ctrl->row_n);
}
/* Decimation control */
stk1160_write_reg(dev, STK1160_DMCTRL, val);
}
/*
* Set a new alternate setting.
* Returns true is dev->max_pkt_size has changed, false otherwise.
@ -323,27 +382,115 @@ static int vidioc_g_fmt_vid_cap(struct file *file, void *priv,
return 0;
}
static int stk1160_try_fmt(struct stk1160 *dev, struct v4l2_format *f,
struct stk1160_decimate_ctrl *ctrl)
{
unsigned int width, height;
unsigned int base_width, base_height;
unsigned int col_n, row_n;
enum stk1160_decimate_mode col_mode, row_mode;
bool col_en, row_en;
base_width = 720;
base_height = (dev->norm & V4L2_STD_525_60) ? 480 : 576;
/* Minimum width and height is 5% the frame size */
width = clamp_t(unsigned int, f->fmt.pix.width,
base_width / 20, base_width);
height = clamp_t(unsigned int, f->fmt.pix.height,
base_height / 20, base_height);
/* Let's set default no decimation values */
col_n = 0;
row_n = 0;
col_en = false;
row_en = false;
f->fmt.pix.width = base_width;
f->fmt.pix.height = base_height;
row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
if (width < base_width && width > base_width / 2) {
/*
* The device will send count units for each
* unit skipped. This means count unit is:
*
* n = width / (frame width - width)
*
* And the width is:
*
* width = (n / n + 1) * frame width
*/
col_n = div_round_integer(width, base_width - width);
if (col_n > 0 && col_n <= 255) {
col_en = true;
col_mode = STK1160_DECIMATE_LESS_THAN_HALF;
f->fmt.pix.width = (base_width * col_n) / (col_n + 1);
}
} else if (width <= base_width / 2) {
/*
* The device will skip count units for each
* unit sent. This means count is:
*
* n = (frame width / width) - 1
*
* And the width is:
*
* width = frame width / (n + 1)
*/
col_n = div_round_integer(base_width, width) - 1;
if (col_n > 0 && col_n <= 255) {
col_en = true;
col_mode = STK1160_DECIMATE_MORE_THAN_HALF;
f->fmt.pix.width = base_width / (col_n + 1);
}
}
if (height < base_height && height > base_height / 2) {
row_n = div_round_integer(height, base_height - height);
if (row_n > 0 && row_n <= 255) {
row_en = true;
row_mode = STK1160_DECIMATE_LESS_THAN_HALF;
f->fmt.pix.height = (base_height * row_n) / (row_n + 1);
}
} else if (height <= base_height / 2) {
row_n = div_round_integer(base_height, height) - 1;
if (row_n > 0 && row_n <= 255) {
row_en = true;
row_mode = STK1160_DECIMATE_MORE_THAN_HALF;
f->fmt.pix.height = base_height / (row_n + 1);
}
}
f->fmt.pix.pixelformat = dev->fmt->fourcc;
f->fmt.pix.field = V4L2_FIELD_INTERLACED;
f->fmt.pix.bytesperline = f->fmt.pix.width * 2;
f->fmt.pix.sizeimage = f->fmt.pix.height * f->fmt.pix.bytesperline;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
if (ctrl) {
ctrl->col_en = col_en;
ctrl->col_n = col_n;
ctrl->col_mode = col_mode;
ctrl->row_en = row_en;
ctrl->row_n = row_n;
ctrl->row_mode = row_mode;
}
stk1160_dbg("width %d, height %d\n",
f->fmt.pix.width, f->fmt.pix.height);
return 0;
}
static int vidioc_try_fmt_vid_cap(struct file *file, void *priv,
struct v4l2_format *f)
struct v4l2_format *f)
{
struct stk1160 *dev = video_drvdata(file);
/*
* User can't choose size at his own will,
* so we just return him the current size chosen
* at standard selection.
* TODO: Implement frame scaling?
*/
f->fmt.pix.pixelformat = dev->fmt->fourcc;
f->fmt.pix.width = dev->width;
f->fmt.pix.height = dev->height;
f->fmt.pix.field = V4L2_FIELD_INTERLACED;
f->fmt.pix.bytesperline = dev->width * 2;
f->fmt.pix.sizeimage = dev->height * f->fmt.pix.bytesperline;
f->fmt.pix.colorspace = V4L2_COLORSPACE_SMPTE170M;
return 0;
return stk1160_try_fmt(dev, f, NULL);
}
static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
@ -351,13 +498,18 @@ static int vidioc_s_fmt_vid_cap(struct file *file, void *priv,
{
struct stk1160 *dev = video_drvdata(file);
struct vb2_queue *q = &dev->vb_vidq;
struct stk1160_decimate_ctrl ctrl;
int rc;
if (vb2_is_busy(q))
return -EBUSY;
vidioc_try_fmt_vid_cap(file, priv, f);
/* We don't support any format changes */
rc = stk1160_try_fmt(dev, f, &ctrl);
if (rc < 0)
return rc;
dev->width = f->fmt.pix.width;
dev->height = f->fmt.pix.height;
stk1160_set_fmt(dev, &ctrl);
return 0;
}
@ -393,22 +545,15 @@ static int vidioc_s_std(struct file *file, void *priv, v4l2_std_id norm)
return -ENODEV;
/* We need to set this now, before we call stk1160_set_std */
dev->width = 720;
dev->height = (norm & V4L2_STD_525_60) ? 480 : 576;
dev->norm = norm;
/* This is taken from saa7115 video decoder */
if (dev->norm & V4L2_STD_525_60) {
dev->width = 720;
dev->height = 480;
} else if (dev->norm & V4L2_STD_625_50) {
dev->width = 720;
dev->height = 576;
} else {
stk1160_err("invalid standard\n");
return -EINVAL;
}
stk1160_set_std(dev);
/* Calling with NULL disables frame decimation */
stk1160_set_fmt(dev, NULL);
v4l2_device_call_all(&dev->v4l2_dev, 0, video, s_std,
dev->norm);