some v4l2 code lines are taken from Justin's bttv2 driver which is
(c) 2000 Justin Schoeman <justin@suntiger.ee.up.ac.za>
+ Cropping and overscan support
+ Copyright (C) 2005, 2006 Michael H. Schimek <mschimek@gmx.at>
+ Sponsored by OPQ Systems AB
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
static unsigned int irq_debug;
static unsigned int gbuffers = 8;
static unsigned int gbufsize = 0x208000;
+static unsigned int reset_crop = 1;
static int video_nr = -1;
static int radio_nr = -1;
module_param(vbi_nr, int, 0444);
module_param(gbuffers, int, 0444);
module_param(gbufsize, int, 0444);
+module_param(reset_crop, int, 0444);
module_param(v4l2, int, 0644);
module_param(bigendian, int, 0644);
MODULE_PARM_DESC(irq_debug,"irq handler debug messages, default is 0 (no)");
MODULE_PARM_DESC(gbuffers,"number of capture buffers. range 2-32, default 8");
MODULE_PARM_DESC(gbufsize,"size of the capture buffers, default is 0x208000");
+MODULE_PARM_DESC(reset_crop,"reset cropping parameters at open(), default "
+ "is 1 (yes) for compatibility with older applications");
MODULE_PARM_DESC(automute,"mute audio on bad/missing video signal, default is 1 (yes)");
MODULE_PARM_DESC(chroma_agc,"enables the AGC of chroma signal, default is 0 (no)");
MODULE_PARM_DESC(adc_crush,"enables the luminance ADC crush, default is 1 (yes)");
}
};
+/* minhdelayx1 first video pixel we can capture on a line and
+ hdelayx1 start of active video, both relative to rising edge of
+ /HRESET pulse (0H) in 1 / fCLKx1.
+ swidth width of active video and
+ totalwidth total line width, both in 1 / fCLKx1.
+ sqwidth total line width in square pixels.
+ vdelay start of active video in 2 * field lines relative to
+ trailing edge of /VRESET pulse (VDELAY register).
+ sheight height of active video in 2 * field lines.
+ videostart0 ITU-R frame line number of the line corresponding
+ to vdelay in the first field. */
+#define CROPCAP(minhdelayx1, hdelayx1, swidth, totalwidth, sqwidth, \
+ vdelay, sheight, videostart0) \
+ .cropcap.bounds.left = minhdelayx1, \
+ /* * 2 because vertically we count field lines times two, */ \
+ /* e.g. 23 * 2 to 23 * 2 + 576 in PAL-BGHI defrect. */ \
+ .cropcap.bounds.top = (videostart0) * 2 - (vdelay) + MIN_VDELAY, \
+ /* 4 is a safety margin at the end of the line. */ \
+ .cropcap.bounds.width = (totalwidth) - (minhdelayx1) - 4, \
+ .cropcap.bounds.height = (sheight) + (vdelay) - MIN_VDELAY, \
+ .cropcap.defrect.left = hdelayx1, \
+ .cropcap.defrect.top = (videostart0) * 2, \
+ .cropcap.defrect.width = swidth, \
+ .cropcap.defrect.height = sheight, \
+ .cropcap.pixelaspect.numerator = totalwidth, \
+ .cropcap.pixelaspect.denominator = sqwidth,
+
const struct bttv_tvnorm bttv_tvnorms[] = {
/* PAL-BDGHI */
/* max. active video is actually 922, but 924 is divisible by 4 and 3! */
.hdelayx1 = 186,
.hactivex1 = 924,
.vdelay = 0x20,
- .vbipack = 255,
+ .vbipack = 255, /* min (2048 / 4, 0x1ff) & 0xff */
.sram = 0,
/* ITU-R frame line number of the first VBI line
- we can capture, of the first and second field. */
- .vbistart = { 7,320 },
+ we can capture, of the first and second field.
+ The last line is determined by cropcap.bounds. */
+ .vbistart = { 7, 320 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 186,
+ /* Should be (768 * 1135 + 944 / 2) / 944.
+ cropcap.defrect is used for image width
+ checks, so we keep the old value 924. */
+ /* swidth */ 924,
+ /* totalwidth */ 1135,
+ /* sqwidth */ 944,
+ /* vdelay */ 0x20,
+ /* sheight */ 576,
+ /* videostart0 */ 23)
+ /* bt878 (and bt848?) can capture another
+ line below active video. */
+ .cropcap.bounds.height = (576 + 2) + 0x20 - 2,
},{
.v4l2_id = V4L2_STD_NTSC_M | V4L2_STD_NTSC_M_KR,
.name = "NTSC",
.hdelayx1 = 128,
.hactivex1 = 910,
.vdelay = 0x1a,
- .vbipack = 144,
+ .vbipack = 144, /* min (1600 / 4, 0x1ff) & 0xff */
.sram = 1,
.vbistart = { 10, 273 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 128,
+ /* Should be (640 * 910 + 780 / 2) / 780? */
+ /* swidth */ 768,
+ /* totalwidth */ 910,
+ /* sqwidth */ 780,
+ /* vdelay */ 0x1a,
+ /* sheight */ 480,
+ /* videostart0 */ 23)
},{
.v4l2_id = V4L2_STD_SECAM,
.name = "SECAM",
.vbipack = 255,
.sram = 0, /* like PAL, correct? */
.vbistart = { 7, 320 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 186,
+ /* swidth */ 924,
+ /* totalwidth */ 1135,
+ /* sqwidth */ 944,
+ /* vdelay */ 0x20,
+ /* sheight */ 576,
+ /* videostart0 */ 23)
},{
.v4l2_id = V4L2_STD_PAL_Nc,
.name = "PAL-Nc",
.vbipack = 144,
.sram = -1,
.vbistart = { 7, 320 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 130,
+ /* swidth */ (640 * 910 + 780 / 2) / 780,
+ /* totalwidth */ 910,
+ /* sqwidth */ 780,
+ /* vdelay */ 0x1a,
+ /* sheight */ 576,
+ /* videostart0 */ 23)
},{
.v4l2_id = V4L2_STD_PAL_M,
.name = "PAL-M",
.vbipack = 144,
.sram = -1,
.vbistart = { 10, 273 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 135,
+ /* swidth */ (640 * 910 + 780 / 2) / 780,
+ /* totalwidth */ 910,
+ /* sqwidth */ 780,
+ /* vdelay */ 0x1a,
+ /* sheight */ 480,
+ /* videostart0 */ 23)
},{
.v4l2_id = V4L2_STD_PAL_N,
.name = "PAL-N",
.vdelay = 0x20,
.vbipack = 144,
.sram = -1,
- .vbistart = { 7, 320},
+ .vbistart = { 7, 320 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 186,
+ /* swidth */ (768 * 1135 + 944 / 2) / 944,
+ /* totalwidth */ 1135,
+ /* sqwidth */ 944,
+ /* vdelay */ 0x20,
+ /* sheight */ 576,
+ /* videostart0 */ 23)
},{
.v4l2_id = V4L2_STD_NTSC_M_JP,
.name = "NTSC-JP",
.vdelay = 0x16,
.vbipack = 144,
.sram = -1,
- .vbistart = {10, 273},
+ .vbistart = { 10, 273 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 135,
+ /* swidth */ (640 * 910 + 780 / 2) / 780,
+ /* totalwidth */ 910,
+ /* sqwidth */ 780,
+ /* vdelay */ 0x16,
+ /* sheight */ 480,
+ /* videostart0 */ 23)
},{
/* that one hopefully works with the strange timing
* which video recorders produce when playing a NTSC
.vtotal = 524,
.sram = -1,
.vbistart = { 10, 273 },
+ CROPCAP(/* minhdelayx1 */ 68,
+ /* hdelayx1 */ 186,
+ /* swidth */ 924,
+ /* totalwidth */ 1135,
+ /* sqwidth */ 944,
+ /* vdelay */ 0x1a,
+ /* sheight */ 480,
+ /* videostart0 */ 23)
}
};
static const unsigned int BTTV_TVNORMS = ARRAY_SIZE(bttv_tvnorms);
/* ----------------------------------------------------------------------- */
/* resource management */
+/*
+ RESOURCE_ allocated by freed by
+
+ VIDEO_READ bttv_read 1) bttv_read 2)
+
+ VIDEO_STREAM VIDIOC_STREAMON VIDIOC_STREAMOFF
+ VIDIOC_QBUF 1) bttv_release
+ VIDIOCMCAPTURE 1)
+
+ OVERLAY VIDIOCCAPTURE on VIDIOCCAPTURE off
+ VIDIOC_OVERLAY on VIDIOC_OVERLAY off
+ 3) bttv_release
+
+ VBI VIDIOC_STREAMON VIDIOC_STREAMOFF
+ VIDIOC_QBUF 1) bttv_release
+ bttv_read, bttv_poll 1) 4)
+
+ 1) The resource must be allocated when we enter buffer prepare functions
+ and remain allocated while buffers are in the DMA queue.
+ 2) This is a single frame read.
+ 3) VIDIOC_S_FBUF and VIDIOC_S_FMT (OVERLAY) still work when
+ RESOURCE_OVERLAY is allocated.
+ 4) This is a continuous read, implies VIDIOC_STREAMON.
+
+ Note this driver permits video input and standard changes regardless if
+ resources are allocated.
+*/
+
+#define VBI_RESOURCES (RESOURCE_VBI)
+#define VIDEO_RESOURCES (RESOURCE_VIDEO_READ | \
+ RESOURCE_VIDEO_STREAM | \
+ RESOURCE_OVERLAY)
+
static
int check_alloc_btres(struct bttv *btv, struct bttv_fh *fh, int bit)
{
+ int xbits; /* mutual exclusive resources */
+
if (fh->resources & bit)
/* have it already allocated */
return 1;
+ xbits = bit;
+ if (bit & (RESOURCE_VIDEO_READ | RESOURCE_VIDEO_STREAM))
+ xbits |= RESOURCE_VIDEO_READ | RESOURCE_VIDEO_STREAM;
+
/* is it free? */
- mutex_lock(&btv->reslock);
- if (btv->resources & bit) {
+ mutex_lock(&btv->lock);
+ if (btv->resources & xbits) {
/* no, someone else uses it */
- mutex_unlock(&btv->reslock);
- return 0;
+ goto fail;
+ }
+
+ if ((bit & VIDEO_RESOURCES)
+ && 0 == (btv->resources & VIDEO_RESOURCES)) {
+ /* Do crop - use current, don't - use default parameters. */
+ __s32 top = btv->crop[!!fh->do_crop].rect.top;
+
+ if (btv->vbi_end > top)
+ goto fail;
+
+ /* We cannot capture the same line as video and VBI data.
+ Claim scan lines crop[].rect.top to bottom. */
+ btv->crop_start = top;
+ } else if (bit & VBI_RESOURCES) {
+ __s32 end = fh->vbi_fmt.end;
+
+ if (end > btv->crop_start)
+ goto fail;
+
+ /* Claim scan lines above fh->vbi_fmt.end. */
+ btv->vbi_end = end;
}
+
/* it's free, grab it */
fh->resources |= bit;
btv->resources |= bit;
- mutex_unlock(&btv->reslock);
+ mutex_unlock(&btv->lock);
return 1;
+
+ fail:
+ mutex_unlock(&btv->lock);
+ return 0;
}
static
return (btv->resources & bit);
}
+/* Call with btv->lock down. */
+static void
+disclaim_vbi_lines(struct bttv *btv)
+{
+ btv->vbi_end = 0;
+}
+
+/* Call with btv->lock down. */
+static void
+disclaim_video_lines(struct bttv *btv)
+{
+ const struct bttv_tvnorm *tvnorm;
+ u8 crop;
+
+ tvnorm = &bttv_tvnorms[btv->tvnorm];
+ btv->crop_start = tvnorm->cropcap.bounds.top
+ + tvnorm->cropcap.bounds.height;
+
+ /* VBI capturing ends at VDELAY, start of video capturing, no
+ matter how many lines the VBI RISC program expects. When video
+ capturing is off, it shall no longer "preempt" VBI capturing,
+ so we set VDELAY to maximum. */
+ crop = btread(BT848_E_CROP) | 0xc0;
+ btwrite(crop, BT848_E_CROP);
+ btwrite(0xfe, BT848_E_VDELAY_LO);
+ btwrite(crop, BT848_O_CROP);
+ btwrite(0xfe, BT848_O_VDELAY_LO);
+}
+
static
void free_btres(struct bttv *btv, struct bttv_fh *fh, int bits)
{
/* trying to free ressources not allocated by us ... */
printk("bttv: BUG! (btres)\n");
}
- mutex_lock(&btv->reslock);
+ mutex_lock(&btv->lock);
fh->resources &= ~bits;
btv->resources &= ~bits;
- mutex_unlock(&btv->reslock);
+
+ bits = btv->resources;
+
+ if (0 == (bits & VIDEO_RESOURCES))
+ disclaim_video_lines(btv);
+
+ if (0 == (bits & VBI_RESOURCES))
+ disclaim_vbi_lines(btv);
+
+ mutex_unlock(&btv->lock);
}
/* ----------------------------------------------------------------------- */
bttv_tda9880_setnorm(btv,btv->tvnorm);
}
+static void
+bttv_crop_calc_limits(struct bttv_crop *c)
+{
+ /* Scale factor min. 1:1, max. 16:1. Min. image size
+ 48 x 32. Scaled width must be a multiple of 4. */
+
+ if (1) {
+ /* For bug compatibility with VIDIOCGCAP and image
+ size checks in earlier driver versions. */
+ c->min_scaled_width = 48;
+ c->min_scaled_height = 32;
+ } else {
+ c->min_scaled_width =
+ (max(48, c->rect.width >> 4) + 3) & ~3;
+ c->min_scaled_height =
+ max(32, c->rect.height >> 4);
+ }
+
+ c->max_scaled_width = c->rect.width & ~3;
+ c->max_scaled_height = c->rect.height;
+}
+
+static void
+bttv_crop_reset(struct bttv_crop *c, int norm)
+{
+ c->rect = bttv_tvnorms[norm].cropcap.defrect;
+ bttv_crop_calc_limits(c);
+}
+
+/* Call with btv->lock down. */
static int
set_tvnorm(struct bttv *btv, unsigned int norm)
{
if (norm < 0 || norm >= BTTV_TVNORMS)
return -EINVAL;
- btv->tvnorm = norm;
tvnorm = &bttv_tvnorms[norm];
+ if (btv->tvnorm < 0 ||
+ btv->tvnorm >= BTTV_TVNORMS ||
+ 0 != memcmp(&bttv_tvnorms[btv->tvnorm].cropcap,
+ &tvnorm->cropcap,
+ sizeof (tvnorm->cropcap))) {
+ bttv_crop_reset(&btv->crop[0], norm);
+ btv->crop[1] = btv->crop[0]; /* current = default */
+
+ if (0 == (btv->resources & VIDEO_RESOURCES)) {
+ btv->crop_start = tvnorm->cropcap.bounds.top
+ + tvnorm->cropcap.bounds.height;
+ }
+ }
+
+ btv->tvnorm = norm;
+
btwrite(tvnorm->adelay, BT848_ADELAY);
btwrite(tvnorm->bdelay, BT848_BDELAY);
btaor(tvnorm->iform,~(BT848_IFORM_NORM|BT848_IFORM_XTBOTH),
return 0;
}
+/* Call with btv->lock down. */
static void
set_input(struct bttv *btv, unsigned int input)
{
btv->loop_irq |= 1;
bttv_set_dma(btv, 0x03);
spin_unlock_irqrestore(&btv->s_lock,flags);
- if (NULL == new)
- free_btres(btv,fh,RESOURCE_OVERLAY);
if (NULL != old) {
dprintk("switch_overlay: old=%p state is %d\n",old,old->vb.state);
bttv_dma_free(&fh->cap,btv, old);
kfree(old);
}
+ if (NULL == new)
+ free_btres(btv,fh,RESOURCE_OVERLAY);
dprintk("switch_overlay: done\n");
return retval;
}
unsigned int width, unsigned int height,
enum v4l2_field field)
{
+ struct bttv_fh *fh = q->priv_data;
int redo_dma_risc = 0;
+ struct bttv_crop c;
+ int norm;
int rc;
/* check settings */
if (width*height > buf->vb.bsize)
return -EINVAL;
buf->vb.size = buf->vb.bsize;
+
+ /* Make sure tvnorm and vbi_end remain consistent
+ until we're done. */
+ mutex_lock(&btv->lock);
+
+ norm = btv->tvnorm;
+
+ /* In this mode capturing always starts at defrect.top
+ (default VDELAY), ignoring cropping parameters. */
+ if (btv->vbi_end > bttv_tvnorms[norm].cropcap.defrect.top) {
+ mutex_unlock(&btv->lock);
+ return -EINVAL;
+ }
+
+ mutex_unlock(&btv->lock);
+
+ c.rect = bttv_tvnorms[norm].cropcap.defrect;
} else {
- if (width < 48 ||
- height < 32 ||
- width > bttv_tvnorms[btv->tvnorm].swidth ||
- height > bttv_tvnorms[btv->tvnorm].sheight)
+ mutex_lock(&btv->lock);
+
+ norm = btv->tvnorm;
+ c = btv->crop[!!fh->do_crop];
+
+ mutex_unlock(&btv->lock);
+
+ if (width < c.min_scaled_width ||
+ width > c.max_scaled_width ||
+ height < c.min_scaled_height)
return -EINVAL;
+
+ switch (field) {
+ case V4L2_FIELD_TOP:
+ case V4L2_FIELD_BOTTOM:
+ case V4L2_FIELD_ALTERNATE:
+ /* btv->crop counts frame lines. Max. scale
+ factor is 16:1 for frames, 8:1 for fields. */
+ if (height * 2 > c.max_scaled_height)
+ return -EINVAL;
+ break;
+
+ default:
+ if (height > c.max_scaled_height)
+ return -EINVAL;
+ break;
+ }
+
buf->vb.size = (width * height * fmt->depth) >> 3;
if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
return -EINVAL;
/* alloc + fill struct bttv_buffer (if changed) */
if (buf->vb.width != width || buf->vb.height != height ||
buf->vb.field != field ||
- buf->tvnorm != btv->tvnorm || buf->fmt != fmt) {
+ buf->tvnorm != norm || buf->fmt != fmt ||
+ buf->crop.top != c.rect.top ||
+ buf->crop.left != c.rect.left ||
+ buf->crop.width != c.rect.width ||
+ buf->crop.height != c.rect.height) {
buf->vb.width = width;
buf->vb.height = height;
buf->vb.field = field;
- buf->tvnorm = btv->tvnorm;
+ buf->tvnorm = norm;
buf->fmt = fmt;
+ buf->crop = c.rect;
redo_dma_risc = 1;
}
return 0;
}
-static int verify_window(const struct bttv_tvnorm *tvn,
- struct v4l2_window *win, int fixup)
+/* Given cropping boundaries b and the scaled width and height of a
+ single field or frame, which must not exceed hardware limits, this
+ function adjusts the cropping parameters c. */
+static void
+bttv_crop_adjust (struct bttv_crop * c,
+ const struct v4l2_rect * b,
+ __s32 width,
+ __s32 height,
+ enum v4l2_field field)
+{
+ __s32 frame_height = height << !V4L2_FIELD_HAS_BOTH(field);
+ __s32 max_left;
+ __s32 max_top;
+
+ if (width < c->min_scaled_width) {
+ /* Max. hor. scale factor 16:1. */
+ c->rect.width = width * 16;
+ } else if (width > c->max_scaled_width) {
+ /* Min. hor. scale factor 1:1. */
+ c->rect.width = width;
+
+ max_left = b->left + b->width - width;
+ max_left = min(max_left, (__s32) MAX_HDELAY);
+ if (c->rect.left > max_left)
+ c->rect.left = max_left;
+ }
+
+ if (height < c->min_scaled_height) {
+ /* Max. vert. scale factor 16:1, single fields 8:1. */
+ c->rect.height = height * 16;
+ } else if (frame_height > c->max_scaled_height) {
+ /* Min. vert. scale factor 1:1.
+ Top and height count field lines times two. */
+ c->rect.height = (frame_height + 1) & ~1;
+
+ max_top = b->top + b->height - c->rect.height;
+ if (c->rect.top > max_top)
+ c->rect.top = max_top;
+ }
+
+ bttv_crop_calc_limits(c);
+}
+
+/* Returns an error if scaling to a frame or single field with the given
+ width and height is not possible with the current cropping parameters
+ and width aligned according to width_mask. If adjust_size is TRUE the
+ function may adjust the width and/or height instead, rounding width
+ to (width + width_bias) & width_mask. If adjust_crop is TRUE it may
+ also adjust the current cropping parameters to get closer to the
+ desired image size. */
+static int
+limit_scaled_size (struct bttv_fh * fh,
+ __s32 * width,
+ __s32 * height,
+ enum v4l2_field field,
+ unsigned int width_mask,
+ unsigned int width_bias,
+ int adjust_size,
+ int adjust_crop)
+{
+ struct bttv *btv = fh->btv;
+ const struct v4l2_rect *b;
+ struct bttv_crop *c;
+ __s32 min_width;
+ __s32 min_height;
+ __s32 max_width;
+ __s32 max_height;
+ int rc;
+
+ BUG_ON((int) width_mask >= 0 ||
+ width_bias >= (unsigned int) -width_mask);
+
+ /* Make sure tvnorm, vbi_end and the current cropping parameters
+ remain consistent until we're done. */
+ mutex_lock(&btv->lock);
+
+ b = &bttv_tvnorms[btv->tvnorm].cropcap.bounds;
+
+ /* Do crop - use current, don't - use default parameters. */
+ c = &btv->crop[!!fh->do_crop];
+
+ if (fh->do_crop
+ && adjust_size
+ && adjust_crop
+ && !locked_btres(btv, VIDEO_RESOURCES)) {
+ min_width = 48;
+ min_height = 32;
+
+ /* We cannot scale up. When the scaled image is larger
+ than crop.rect we adjust the crop.rect as required
+ by the V4L2 spec, hence cropcap.bounds are our limit. */
+ max_width = min(b->width, (__s32) MAX_HACTIVE);
+ max_height = b->height;
+
+ /* We cannot capture the same line as video and VBI data.
+ Note btv->vbi_end is really a minimum, see
+ bttv_vbi_try_fmt(). */
+ if (btv->vbi_end > b->top) {
+ max_height -= btv->vbi_end - b->top;
+ rc = -EBUSY;
+ if (min_height > max_height)
+ goto fail;
+ }
+ } else {
+ rc = -EBUSY;
+ if (btv->vbi_end > c->rect.top)
+ goto fail;
+
+ min_width = c->min_scaled_width;
+ min_height = c->min_scaled_height;
+ max_width = c->max_scaled_width;
+ max_height = c->max_scaled_height;
+
+ adjust_crop = 0;
+ }
+
+ min_width = (min_width - width_mask - 1) & width_mask;
+ max_width = max_width & width_mask;
+
+ /* Max. scale factor is 16:1 for frames, 8:1 for fields. */
+ min_height = min_height;
+ /* Min. scale factor is 1:1. */
+ max_height >>= !V4L2_FIELD_HAS_BOTH(field);
+
+ if (adjust_size) {
+ *width = clamp(*width, min_width, max_width);
+ *height = clamp(*height, min_height, max_height);
+
+ /* Round after clamping to avoid overflow. */
+ *width = (*width + width_bias) & width_mask;
+
+ if (adjust_crop) {
+ bttv_crop_adjust(c, b, *width, *height, field);
+
+ if (btv->vbi_end > c->rect.top) {
+ /* Move the crop window out of the way. */
+ c->rect.top = btv->vbi_end;
+ }
+ }
+ } else {
+ rc = -EINVAL;
+ if (*width < min_width ||
+ *height < min_height ||
+ *width > max_width ||
+ *height > max_height ||
+ 0 != (*width & ~width_mask))
+ goto fail;
+ }
+
+ rc = 0; /* success */
+
+ fail:
+ mutex_unlock(&btv->lock);
+
+ return rc;
+}
+
+/* Returns an error if the given overlay window dimensions are not
+ possible with the current cropping parameters. If adjust_size is
+ TRUE the function may adjust the window width and/or height
+ instead, however it always rounds the horizontal position and
+ width as btcx_align() does. If adjust_crop is TRUE the function
+ may also adjust the current cropping parameters to get closer
+ to the desired window size. */
+static int
+verify_window (struct bttv_fh * fh,
+ struct v4l2_window * win,
+ int adjust_size,
+ int adjust_crop)
{
enum v4l2_field field;
- int maxw, maxh;
+ unsigned int width_mask;
+ int rc;
if (win->w.width < 48 || win->w.height < 32)
return -EINVAL;
return -EINVAL;
field = win->field;
- maxw = tvn->swidth;
- maxh = tvn->sheight;
if (V4L2_FIELD_ANY == field) {
- field = (win->w.height > maxh/2)
+ __s32 height2;
+
+ height2 = fh->btv->crop[!!fh->do_crop].rect.height >> 1;
+ field = (win->w.height > height2)
? V4L2_FIELD_INTERLACED
: V4L2_FIELD_TOP;
}
switch (field) {
case V4L2_FIELD_TOP:
case V4L2_FIELD_BOTTOM:
- maxh = maxh / 2;
- break;
case V4L2_FIELD_INTERLACED:
break;
default:
return -EINVAL;
}
- if (!fixup && (win->w.width > maxw || win->w.height > maxh))
+ /* 4-byte alignment. */
+ if (NULL == fh->ovfmt)
return -EINVAL;
+ width_mask = ~0;
+ switch (fh->ovfmt->depth) {
+ case 8:
+ case 24:
+ width_mask = ~3;
+ break;
+ case 16:
+ width_mask = ~1;
+ break;
+ case 32:
+ break;
+ default:
+ BUG();
+ }
+
+ win->w.width -= win->w.left & ~width_mask;
+ win->w.left = (win->w.left - width_mask - 1) & width_mask;
+
+ rc = limit_scaled_size(fh, &win->w.width, &win->w.height,
+ field, width_mask,
+ /* width_bias: round down */ 0,
+ adjust_size, adjust_crop);
+ if (0 != rc)
+ return rc;
- if (win->w.width > maxw)
- win->w.width = maxw;
- if (win->w.height > maxh)
- win->w.height = maxh;
win->field = field;
return 0;
}
return -EINVAL;
if (!(fh->ovfmt->flags & FORMAT_FLAGS_PACKED))
return -EINVAL;
- retval = verify_window(&bttv_tvnorms[btv->tvnorm],win,fixup);
+ retval = verify_window(fh, win,
+ /* adjust_size */ fixup,
+ /* adjust_crop */ fixup);
if (0 != retval)
return retval;
struct bttv_buffer *new;
new = videobuf_alloc(sizeof(*new));
+ new->crop = btv->crop[!!fh->do_crop].rect;
bttv_overlay_risc(btv, &fh->ov, fh->ovfmt, new);
retval = bttv_switch_overlay(btv,fh,new);
}
switch (fh->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
- res = RESOURCE_VIDEO;
+ res = RESOURCE_VIDEO_STREAM;
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
res = RESOURCE_VBI;
f->fmt.win.field = fh->ov.field;
return 0;
case V4L2_BUF_TYPE_VBI_CAPTURE:
- bttv_vbi_get_fmt(fh,f);
+ bttv_vbi_get_fmt(fh, &f->fmt.vbi);
return 0;
default:
return -EINVAL;
}
static int bttv_try_fmt(struct bttv_fh *fh, struct bttv *btv,
- struct v4l2_format *f)
+ struct v4l2_format *f, int adjust_crop)
{
switch (f->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
{
const struct bttv_format *fmt;
enum v4l2_field field;
- unsigned int maxw,maxh;
+ __s32 width, height;
+ int rc;
fmt = format_by_fourcc(f->fmt.pix.pixelformat);
if (NULL == fmt)
return -EINVAL;
- /* fixup format */
- maxw = bttv_tvnorms[btv->tvnorm].swidth;
- maxh = bttv_tvnorms[btv->tvnorm].sheight;
field = f->fmt.pix.field;
- if (V4L2_FIELD_ANY == field)
- field = (f->fmt.pix.height > maxh/2)
+ if (V4L2_FIELD_ANY == field) {
+ __s32 height2;
+
+ height2 = btv->crop[!!fh->do_crop].rect.height >> 1;
+ field = (f->fmt.pix.height > height2)
? V4L2_FIELD_INTERLACED
: V4L2_FIELD_BOTTOM;
+ }
if (V4L2_FIELD_SEQ_BT == field)
field = V4L2_FIELD_SEQ_TB;
switch (field) {
case V4L2_FIELD_TOP:
case V4L2_FIELD_BOTTOM:
case V4L2_FIELD_ALTERNATE:
- maxh = maxh/2;
- break;
case V4L2_FIELD_INTERLACED:
break;
case V4L2_FIELD_SEQ_TB:
return -EINVAL;
}
+ width = f->fmt.pix.width;
+ height = f->fmt.pix.height;
+
+ rc = limit_scaled_size(fh, &width, &height, field,
+ /* width_mask: 4 pixels */ ~3,
+ /* width_bias: nearest */ 2,
+ /* adjust_size */ 1,
+ adjust_crop);
+ if (0 != rc)
+ return rc;
+
/* update data for the application */
f->fmt.pix.field = field;
- if (f->fmt.pix.width < 48)
- f->fmt.pix.width = 48;
- if (f->fmt.pix.height < 32)
- f->fmt.pix.height = 32;
- if (f->fmt.pix.width > maxw)
- f->fmt.pix.width = maxw;
- if (f->fmt.pix.height > maxh)
- f->fmt.pix.height = maxh;
- pix_format_set_size (&f->fmt.pix, fmt,
- f->fmt.pix.width & ~3,
- f->fmt.pix.height);
+ pix_format_set_size(&f->fmt.pix, fmt, width, height);
return 0;
}
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
- return verify_window(&bttv_tvnorms[btv->tvnorm],
- &f->fmt.win, 1);
+ return verify_window(fh, &f->fmt.win,
+ /* adjust_size */ 1,
+ /* adjust_crop */ 0);
case V4L2_BUF_TYPE_VBI_CAPTURE:
- bttv_vbi_try_fmt(fh,f);
- return 0;
+ return bttv_vbi_try_fmt(fh, &f->fmt.vbi);
default:
return -EINVAL;
}
retval = bttv_switch_type(fh,f->type);
if (0 != retval)
return retval;
- retval = bttv_try_fmt(fh,btv,f);
+ retval = bttv_try_fmt(fh,btv,f, /* adjust_crop */ 1);
if (0 != retval)
return retval;
fmt = format_by_fourcc(f->fmt.pix.pixelformat);
retval = bttv_switch_type(fh,f->type);
if (0 != retval)
return retval;
- if (locked_btres(fh->btv, RESOURCE_VBI))
- return -EBUSY;
- bttv_vbi_try_fmt(fh,f);
- bttv_vbi_setlines(fh,btv,f->fmt.vbi.count[0]);
- bttv_vbi_get_fmt(fh,f);
- return 0;
+ return bttv_vbi_set_fmt(fh, &f->fmt.vbi);
default:
return -EINVAL;
}
if (*on) {
fh->ov.tvnorm = btv->tvnorm;
new = videobuf_alloc(sizeof(*new));
+ new->crop = btv->crop[!!fh->do_crop].rect;
bttv_overlay_risc(btv, &fh->ov, fh->ovfmt, new);
} else {
new = NULL;
struct video_mmap *vm = arg;
struct bttv_buffer *buf;
enum v4l2_field field;
+ __s32 height2;
+ int res;
if (vm->frame >= VIDEO_MAX_FRAME)
return -EINVAL;
+ res = bttv_resource(fh);
+ if (!check_alloc_btres(btv, fh, res))
+ return -EBUSY;
+
mutex_lock(&fh->cap.lock);
retval = -EINVAL;
buf = (struct bttv_buffer *)fh->cap.bufs[vm->frame];
buf->vb.state == STATE_ACTIVE)
goto fh_unlock_and_return;
- field = (vm->height > bttv_tvnorms[btv->tvnorm].sheight/2)
+ height2 = btv->crop[!!fh->do_crop].rect.height >> 1;
+ field = (vm->height > height2)
? V4L2_FIELD_INTERLACED
: V4L2_FIELD_BOTTOM;
retval = bttv_prepare_buffer(&fh->cap,btv,buf,
}
case VIDIOCGVBIFMT:
- {
- struct vbi_format *fmt = (void *) arg;
- struct v4l2_format fmt2;
-
if (fh->type != V4L2_BUF_TYPE_VBI_CAPTURE) {
retval = bttv_switch_type(fh,V4L2_BUF_TYPE_VBI_CAPTURE);
if (0 != retval)
return retval;
}
- bttv_vbi_get_fmt(fh, &fmt2);
-
- memset(fmt,0,sizeof(*fmt));
- fmt->sampling_rate = fmt2.fmt.vbi.sampling_rate;
- fmt->samples_per_line = fmt2.fmt.vbi.samples_per_line;
- fmt->sample_format = VIDEO_PALETTE_RAW;
- fmt->start[0] = fmt2.fmt.vbi.start[0];
- fmt->count[0] = fmt2.fmt.vbi.count[0];
- fmt->start[1] = fmt2.fmt.vbi.start[1];
- fmt->count[1] = fmt2.fmt.vbi.count[1];
- if (fmt2.fmt.vbi.flags & V4L2_VBI_UNSYNC)
- fmt->flags |= VBI_UNSYNC;
- if (fmt2.fmt.vbi.flags & V4L2_VBI_INTERLACED)
- fmt->flags |= VBI_INTERLACED;
- return 0;
- }
- case VIDIOCSVBIFMT:
- {
- struct vbi_format *fmt = (void *) arg;
- struct v4l2_format fmt2;
- retval = bttv_switch_type(fh,V4L2_BUF_TYPE_VBI_CAPTURE);
- if (0 != retval)
- return retval;
- bttv_vbi_get_fmt(fh, &fmt2);
-
- if (fmt->sampling_rate != fmt2.fmt.vbi.sampling_rate ||
- fmt->samples_per_line != fmt2.fmt.vbi.samples_per_line ||
- fmt->sample_format != VIDEO_PALETTE_RAW ||
- fmt->start[0] != fmt2.fmt.vbi.start[0] ||
- fmt->start[1] != fmt2.fmt.vbi.start[1] ||
- fmt->count[0] != fmt->count[1] ||
- fmt->count[0] < 1 ||
- fmt->count[0] > 32 /* VBI_MAXLINES */)
- return -EINVAL;
+ /* fall through */
- bttv_vbi_setlines(fh,btv,fmt->count[0]);
- return 0;
- }
+ case VIDIOCSVBIFMT:
+ return v4l_compat_translate_ioctl(inode, file, cmd,
+ arg, bttv_do_ioctl);
case BTTV_VERSION:
case VIDIOCGFREQ:
case VIDIOC_TRY_FMT:
{
struct v4l2_format *f = arg;
- return bttv_try_fmt(fh,btv,f);
+ return bttv_try_fmt(fh,btv,f, /* adjust_crop */ 0);
}
case VIDIOC_G_FMT:
{
if (0 == (fmt->flags & FORMAT_FLAGS_PACKED))
return -EINVAL;
- mutex_lock(&fh->cap.lock);
retval = -EINVAL;
if (fb->flags & V4L2_FBUF_FLAG_OVERLAY) {
- if (fb->fmt.width > bttv_tvnorms[btv->tvnorm].swidth)
- goto fh_unlock_and_return;
- if (fb->fmt.height > bttv_tvnorms[btv->tvnorm].sheight)
- goto fh_unlock_and_return;
+ __s32 width = fb->fmt.width;
+ __s32 height = fb->fmt.height;
+
+ retval = limit_scaled_size(fh, &width, &height,
+ V4L2_FIELD_INTERLACED,
+ /* width_mask */ ~3,
+ /* width_bias */ 2,
+ /* adjust_size */ 0,
+ /* adjust_crop */ 0);
+ if (0 != retval)
+ return retval;
}
/* ok, accept it */
+ mutex_lock(&fh->cap.lock);
btv->fbuf.base = fb->base;
btv->fbuf.fmt.width = fb->fmt.width;
btv->fbuf.fmt.height = fb->fmt.height;
struct bttv_buffer *new;
new = videobuf_alloc(sizeof(*new));
+ new->crop = btv->crop[!!fh->do_crop].rect;
bttv_overlay_risc(btv,&fh->ov,fh->ovfmt,new);
retval = bttv_switch_overlay(btv,fh,new);
}
return videobuf_querybuf(bttv_queue(fh),arg);
case VIDIOC_QBUF:
+ {
+ int res = bttv_resource(fh);
+
+ if (!check_alloc_btres(btv, fh, res))
+ return -EBUSY;
return videobuf_qbuf(bttv_queue(fh),arg);
+ }
case VIDIOC_DQBUF:
return videobuf_dqbuf(bttv_queue(fh),arg,
return v4l2_prio_change(&btv->prio, &fh->prio, *prio);
}
+ case VIDIOC_CROPCAP:
+ {
+ struct v4l2_cropcap *cap = arg;
+ enum v4l2_buf_type type;
+
+ type = cap->type;
+
+ if (type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+ type != V4L2_BUF_TYPE_VIDEO_OVERLAY)
+ return -EINVAL;
+
+ *cap = bttv_tvnorms[btv->tvnorm].cropcap;
+ cap->type = type;
+
+ return 0;
+ }
+ case VIDIOC_G_CROP:
+ {
+ struct v4l2_crop * crop = arg;
+
+ if (crop->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+ crop->type != V4L2_BUF_TYPE_VIDEO_OVERLAY)
+ return -EINVAL;
+
+ /* No fh->do_crop = 1; because btv->crop[1] may be
+ inconsistent with fh->width or fh->height and apps
+ do not expect a change here. */
+
+ crop->c = btv->crop[!!fh->do_crop].rect;
+
+ return 0;
+ }
+ case VIDIOC_S_CROP:
+ {
+ struct v4l2_crop *crop = arg;
+ const struct v4l2_rect *b;
+ struct bttv_crop c;
+ __s32 b_left;
+ __s32 b_top;
+ __s32 b_right;
+ __s32 b_bottom;
+
+ if (crop->type != V4L2_BUF_TYPE_VIDEO_CAPTURE &&
+ crop->type != V4L2_BUF_TYPE_VIDEO_OVERLAY)
+ return -EINVAL;
+
+ retval = v4l2_prio_check(&btv->prio,&fh->prio);
+ if (0 != retval)
+ return retval;
+
+ /* Make sure tvnorm, vbi_end and the current cropping
+ parameters remain consistent until we're done. Note
+ read() may change vbi_end in check_alloc_btres(). */
+ mutex_lock(&btv->lock);
+
+ retval = -EBUSY;
+
+ if (locked_btres(fh->btv, VIDEO_RESOURCES))
+ goto btv_unlock_and_return;
+
+ b = &bttv_tvnorms[btv->tvnorm].cropcap.bounds;
+
+ b_left = b->left;
+ b_right = b_left + b->width;
+ b_bottom = b->top + b->height;
+
+ b_top = max(b->top, btv->vbi_end);
+ if (b_top + 32 >= b_bottom)
+ goto btv_unlock_and_return;
+
+ /* Min. scaled size 48 x 32. */
+ c.rect.left = clamp(crop->c.left, b_left, b_right - 48);
+ c.rect.left = min(c.rect.left, (__s32) MAX_HDELAY);
+
+ c.rect.width = clamp(crop->c.width,
+ 48, b_right - c.rect.left);
+
+ c.rect.top = clamp(crop->c.top, b_top, b_bottom - 32);
+ /* Top and height must be a multiple of two. */
+ c.rect.top = (c.rect.top + 1) & ~1;
+
+ c.rect.height = clamp(crop->c.height,
+ 32, b_bottom - c.rect.top);
+ c.rect.height = (c.rect.height + 1) & ~1;
+
+ bttv_crop_calc_limits(&c);
+
+ btv->crop[1] = c;
+
+ mutex_unlock(&btv->lock);
+
+ fh->do_crop = 1;
+
+ mutex_lock(&fh->cap.lock);
+
+ if (fh->width < c.min_scaled_width) {
+ fh->width = c.min_scaled_width;
+ btv->init.width = c.min_scaled_width;
+ } else if (fh->width > c.max_scaled_width) {
+ fh->width = c.max_scaled_width;
+ btv->init.width = c.max_scaled_width;
+ }
+
+ if (fh->height < c.min_scaled_height) {
+ fh->height = c.min_scaled_height;
+ btv->init.height = c.min_scaled_height;
+ } else if (fh->height > c.max_scaled_height) {
+ fh->height = c.max_scaled_height;
+ btv->init.height = c.max_scaled_height;
+ }
+
+ mutex_unlock(&fh->cap.lock);
+
+ return 0;
+ }
+
case VIDIOC_ENUMSTD:
case VIDIOC_G_STD:
case VIDIOC_S_STD:
fh_unlock_and_return:
mutex_unlock(&fh->cap.lock);
return retval;
+
+ btv_unlock_and_return:
+ mutex_unlock(&btv->lock);
+ return retval;
}
static int bttv_ioctl(struct inode *inode, struct file *file,
switch (cmd) {
case BTTV_VBISIZE:
+ {
+ const struct bttv_tvnorm *tvnorm;
+
+ tvnorm = fh->vbi_fmt.tvnorm;
+
+ if (fh->vbi_fmt.fmt.start[0] != tvnorm->vbistart[0] ||
+ fh->vbi_fmt.fmt.start[1] != tvnorm->vbistart[1] ||
+ fh->vbi_fmt.fmt.count[0] != fh->vbi_fmt.fmt.count[1]) {
+ /* BTTV_VBISIZE cannot express these parameters,
+ however open() resets the paramters to defaults
+ and apps shouldn't call BTTV_VBISIZE after
+ VIDIOC_S_FMT. */
+ return -EINVAL;
+ }
+
bttv_switch_type(fh,V4L2_BUF_TYPE_VBI_CAPTURE);
- return fh->lines * 2 * 2048;
+ return (fh->vbi_fmt.fmt.count[0] * 2
+ * fh->vbi_fmt.fmt.samples_per_line);
+ }
+
default:
return video_usercopy(inode, file, cmd, arg, bttv_do_ioctl);
}
switch (fh->type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
- if (locked_btres(fh->btv,RESOURCE_VIDEO))
+ if (!check_alloc_btres(fh->btv, fh, RESOURCE_VIDEO_READ)) {
+ /* VIDEO_READ in use by another fh,
+ or VIDEO_STREAM by any fh. */
return -EBUSY;
+ }
retval = videobuf_read_one(&fh->cap, data, count, ppos,
file->f_flags & O_NONBLOCK);
+ free_btres(fh->btv, fh, RESOURCE_VIDEO_READ);
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
if (!check_alloc_btres(fh->btv,fh,RESOURCE_VBI))
return videobuf_poll_stream(file, &fh->vbi, wait);
}
- if (check_btres(fh,RESOURCE_VIDEO)) {
+ if (check_btres(fh,RESOURCE_VIDEO_STREAM)) {
/* streaming capture */
if (list_empty(&fh->cap.stream))
return POLLERR;
mutex_lock(&fh->cap.lock);
if (NULL == fh->cap.read_buf) {
/* need to capture a new frame */
- if (locked_btres(fh->btv,RESOURCE_VIDEO)) {
+ if (locked_btres(fh->btv,RESOURCE_VIDEO_STREAM)) {
mutex_unlock(&fh->cap.lock);
return POLLERR;
}
i2c_vidiocschan(btv);
btv->users++;
- if (V4L2_BUF_TYPE_VBI_CAPTURE == fh->type)
- bttv_vbi_setlines(fh,btv,16);
+
+ /* The V4L2 spec requires one global set of cropping parameters
+ which only change on request. These are stored in btv->crop[1].
+ However for compatibility with V4L apps and cropping unaware
+ V4L2 apps we now reset the cropping parameters as seen through
+ this fh, which is to say VIDIOC_G_CROP and scaling limit checks
+ will use btv->crop[0], the default cropping parameters for the
+ current video standard, and VIDIOC_S_FMT will not implicitely
+ change the cropping parameters until VIDIOC_S_CROP has been
+ called. */
+ fh->do_crop = !reset_crop; /* module parameter */
+
+ /* Likewise there should be one global set of VBI capture
+ parameters, but for compatibility with V4L apps and earlier
+ driver versions each fh has its own parameters. */
+ bttv_vbi_fmt_reset(&fh->vbi_fmt, btv->tvnorm);
+
bttv_field_count(btv);
return 0;
}
bttv_switch_overlay(btv,fh,NULL);
/* stop video capture */
- if (check_btres(fh, RESOURCE_VIDEO)) {
+ if (check_btres(fh, RESOURCE_VIDEO_STREAM)) {
videobuf_streamoff(&fh->cap);
- free_btres(btv,fh,RESOURCE_VIDEO);
+ free_btres(btv,fh,RESOURCE_VIDEO_STREAM);
}
if (fh->cap.read_buf) {
buffer_release(&fh->cap,fh->cap.read_buf);
kfree(fh->cap.read_buf);
}
+ if (check_btres(fh, RESOURCE_VIDEO_READ)) {
+ free_btres(btv, fh, RESOURCE_VIDEO_READ);
+ }
/* stop vbi capture */
if (check_btres(fh, RESOURCE_VBI)) {
/* initialize structs / fill in defaults */
mutex_init(&btv->lock);
- mutex_init(&btv->reslock);
spin_lock_init(&btv->s_lock);
spin_lock_init(&btv->gpio_lock);
init_waitqueue_head(&btv->gpioq);
btv->init.fmt = format_by_palette(VIDEO_PALETTE_RGB24);
btv->init.width = 320;
btv->init.height = 240;
- btv->init.lines = 16;
btv->input = 0;
/* initialize hardware */
bt848_sat(btv,32768);
audio_mute(btv, 1);
set_input(btv,0);
+ bttv_crop_reset(&btv->crop[0], btv->tvnorm);
+ btv->crop[1] = btv->crop[0]; /* current = default */
+ disclaim_vbi_lines(btv);
+ disclaim_video_lines(btv);
}
/* add subdevices */
bttv_risc_packed(struct bttv *btv, struct btcx_riscmem *risc,
struct scatterlist *sglist,
unsigned int offset, unsigned int bpl,
- unsigned int padding, unsigned int lines)
+ unsigned int padding, unsigned int skip_lines,
+ unsigned int store_lines)
{
u32 instructions,line,todo;
struct scatterlist *sg;
one write per scan line + sync + jump (all 2 dwords). padding
can cause next bpl to start close to a page border. First DMA
region may be smaller than PAGE_SIZE */
- instructions = 1 + ((bpl + padding) * lines) / PAGE_SIZE + lines;
- instructions += 2;
- if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*8)) < 0)
+ instructions = skip_lines * 4;
+ instructions += (1 + ((bpl + padding) * store_lines)
+ / PAGE_SIZE + store_lines) * 8;
+ instructions += 2 * 8;
+ if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions)) < 0)
return rc;
/* sync instruction */
*(rp++) = cpu_to_le32(BT848_RISC_SYNC|BT848_FIFO_STATUS_FM1);
*(rp++) = cpu_to_le32(0);
+ while (skip_lines-- > 0) {
+ *(rp++) = cpu_to_le32(BT848_RISC_SKIP | BT848_RISC_SOL |
+ BT848_RISC_EOL | bpl);
+ }
+
/* scan lines */
sg = sglist;
- for (line = 0; line < lines; line++) {
+ for (line = 0; line < store_lines; line++) {
if ((btv->opt_vcr_hack) &&
- (line >= (lines - VCR_HACK_LINES)))
+ (line >= (store_lines - VCR_HACK_LINES)))
continue;
while (offset && offset >= sg_dma_len(sg)) {
offset -= sg_dma_len(sg);
/* estimate risc mem: worst case is one write per page border +
one write per scan line (5 dwords)
plus sync + jump (2 dwords) */
- instructions = (ybpl * ylines * 2) / PAGE_SIZE + ylines;
+ instructions = ((3 + (ybpl + ypadding) * ylines * 2)
+ / PAGE_SIZE) + ylines;
instructions += 2;
if ((rc = btcx_riscmem_alloc(btv->c.pci,risc,instructions*4*5)) < 0)
return rc;
/* ---------------------------------------------------------- */
static void
-bttv_calc_geo(struct bttv *btv, struct bttv_geometry *geo,
- int width, int height, int interleaved, int norm)
+bttv_calc_geo_old(struct bttv *btv, struct bttv_geometry *geo,
+ int width, int height, int interleaved,
+ const struct bttv_tvnorm *tvnorm)
{
- const struct bttv_tvnorm *tvnorm = &bttv_tvnorms[norm];
u32 xsf, sr;
int vdelay;
}
}
+static void
+bttv_calc_geo (struct bttv * btv,
+ struct bttv_geometry * geo,
+ unsigned int width,
+ unsigned int height,
+ int both_fields,
+ const struct bttv_tvnorm * tvnorm,
+ const struct v4l2_rect * crop)
+{
+ unsigned int c_width;
+ unsigned int c_height;
+ u32 sr;
+
+ if ((crop->left == tvnorm->cropcap.defrect.left
+ && crop->top == tvnorm->cropcap.defrect.top
+ && crop->width == tvnorm->cropcap.defrect.width
+ && crop->height == tvnorm->cropcap.defrect.height
+ && width <= tvnorm->swidth /* see PAL-Nc et al */)
+ || bttv_tvcards[btv->c.type].muxsel[btv->input] < 0) {
+ bttv_calc_geo_old(btv, geo, width, height,
+ both_fields, tvnorm);
+ return;
+ }
+
+ /* For bug compatibility the image size checks permit scale
+ factors > 16. See bttv_crop_calc_limits(). */
+ c_width = min((unsigned int) crop->width, width * 16);
+ c_height = min((unsigned int) crop->height, height * 16);
+
+ geo->width = width;
+ geo->hscale = (c_width * 4096U + (width >> 1)) / width - 4096;
+ /* Even to store Cb first, odd for Cr. */
+ geo->hdelay = ((crop->left * width + c_width) / c_width) & ~1;
+
+ geo->sheight = c_height;
+ geo->vdelay = crop->top - tvnorm->cropcap.bounds.top + MIN_VDELAY;
+ sr = c_height >> !both_fields;
+ sr = (sr * 512U + (height >> 1)) / height - 512;
+ geo->vscale = (0x10000UL - sr) & 0x1fff;
+ geo->vscale |= both_fields ? (BT848_VSCALE_INT << 8) : 0;
+ geo->vtotal = tvnorm->vtotal;
+
+ geo->crop = (((geo->width >> 8) & 0x03) |
+ ((geo->hdelay >> 6) & 0x0c) |
+ ((geo->sheight >> 4) & 0x30) |
+ ((geo->vdelay >> 2) & 0xc0));
+
+ if (btv->opt_combfilter) {
+ geo->vtc = (width < 193) ? 2 : ((width < 385) ? 1 : 0);
+ geo->comb = (width < 769) ? 1 : 0;
+ } else {
+ geo->vtc = 0;
+ geo->comb = 0;
+ }
+}
+
static void
bttv_apply_geo(struct bttv *btv, struct bttv_geometry *geo, int odd)
{
bttv_buffer_activate_vbi(struct bttv *btv,
struct bttv_buffer *vbi)
{
- /* vbi capture */
+ struct btcx_riscmem *top;
+ struct btcx_riscmem *bottom;
+ int top_irq_flags;
+ int bottom_irq_flags;
+
+ top = NULL;
+ bottom = NULL;
+ top_irq_flags = 0;
+ bottom_irq_flags = 0;
+
if (vbi) {
+ unsigned int crop, vdelay;
+
vbi->vb.state = STATE_ACTIVE;
list_del(&vbi->vb.queue);
- bttv_risc_hook(btv, RISC_SLOT_O_VBI, &vbi->top, 0);
- bttv_risc_hook(btv, RISC_SLOT_E_VBI, &vbi->bottom, 4);
- } else {
- bttv_risc_hook(btv, RISC_SLOT_O_VBI, NULL, 0);
- bttv_risc_hook(btv, RISC_SLOT_E_VBI, NULL, 0);
+
+ /* VDELAY is start of video, end of VBI capturing. */
+ crop = btread(BT848_E_CROP);
+ vdelay = btread(BT848_E_VDELAY_LO) + ((crop & 0xc0) << 2);
+
+ if (vbi->geo.vdelay > vdelay) {
+ vdelay = vbi->geo.vdelay & 0xfe;
+ crop = (crop & 0x3f) | ((vbi->geo.vdelay >> 2) & 0xc0);
+
+ btwrite(vdelay, BT848_E_VDELAY_LO);
+ btwrite(crop, BT848_E_CROP);
+ btwrite(vdelay, BT848_O_VDELAY_LO);
+ btwrite(crop, BT848_O_CROP);
+ }
+
+ if (vbi->vbi_count[0] > 0) {
+ top = &vbi->top;
+ top_irq_flags = 4;
+ }
+
+ if (vbi->vbi_count[1] > 0) {
+ top_irq_flags = 0;
+ bottom = &vbi->bottom;
+ bottom_irq_flags = 4;
+ }
}
+
+ bttv_risc_hook(btv, RISC_SLOT_O_VBI, top, top_irq_flags);
+ bttv_risc_hook(btv, RISC_SLOT_E_VBI, bottom, bottom_irq_flags);
+
return 0;
}
int bpf = bpl * (buf->vb.height >> 1);
bttv_calc_geo(btv,&buf->geo,buf->vb.width,buf->vb.height,
- V4L2_FIELD_HAS_BOTH(buf->vb.field),buf->tvnorm);
+ V4L2_FIELD_HAS_BOTH(buf->vb.field),
+ tvnorm,&buf->crop);
switch (buf->vb.field) {
case V4L2_FIELD_TOP:
bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
- 0,bpl,0,buf->vb.height);
+ /* offset */ 0,bpl,
+ /* padding */ 0,/* skip_lines */ 0,
+ buf->vb.height);
break;
case V4L2_FIELD_BOTTOM:
bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
- 0,bpl,0,buf->vb.height);
+ 0,bpl,0,0,buf->vb.height);
break;
case V4L2_FIELD_INTERLACED:
bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
- 0,bpl,bpl,buf->vb.height >> 1);
+ 0,bpl,bpl,0,buf->vb.height >> 1);
bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
- bpl,bpl,bpl,buf->vb.height >> 1);
+ bpl,bpl,bpl,0,buf->vb.height >> 1);
break;
case V4L2_FIELD_SEQ_TB:
bttv_risc_packed(btv,&buf->top,buf->vb.dma.sglist,
- 0,bpl,0,buf->vb.height >> 1);
+ 0,bpl,0,0,buf->vb.height >> 1);
bttv_risc_packed(btv,&buf->bottom,buf->vb.dma.sglist,
- bpf,bpl,0,buf->vb.height >> 1);
+ bpf,bpl,0,0,buf->vb.height >> 1);
break;
default:
BUG();
switch (buf->vb.field) {
case V4L2_FIELD_TOP:
bttv_calc_geo(btv,&buf->geo,buf->vb.width,
- buf->vb.height,0,buf->tvnorm);
+ buf->vb.height,/* both_fields */ 0,
+ tvnorm,&buf->crop);
bttv_risc_planar(btv, &buf->top, buf->vb.dma.sglist,
0,buf->vb.width,0,buf->vb.height,
uoffset,voffset,buf->fmt->hshift,
break;
case V4L2_FIELD_BOTTOM:
bttv_calc_geo(btv,&buf->geo,buf->vb.width,
- buf->vb.height,0,buf->tvnorm);
+ buf->vb.height,0,
+ tvnorm,&buf->crop);
bttv_risc_planar(btv, &buf->bottom, buf->vb.dma.sglist,
0,buf->vb.width,0,buf->vb.height,
uoffset,voffset,buf->fmt->hshift,
break;
case V4L2_FIELD_INTERLACED:
bttv_calc_geo(btv,&buf->geo,buf->vb.width,
- buf->vb.height,1,buf->tvnorm);
+ buf->vb.height,1,
+ tvnorm,&buf->crop);
lines = buf->vb.height >> 1;
ypadding = buf->vb.width;
cpadding = buf->vb.width >> buf->fmt->hshift;
break;
case V4L2_FIELD_SEQ_TB:
bttv_calc_geo(btv,&buf->geo,buf->vb.width,
- buf->vb.height,1,buf->tvnorm);
+ buf->vb.height,1,
+ tvnorm,&buf->crop);
lines = buf->vb.height >> 1;
ypadding = buf->vb.width;
cpadding = buf->vb.width >> buf->fmt->hshift;
/* build risc code */
buf->vb.field = V4L2_FIELD_SEQ_TB;
bttv_calc_geo(btv,&buf->geo,tvnorm->swidth,tvnorm->sheight,
- 1,buf->tvnorm);
+ 1,tvnorm,&buf->crop);
bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
- 0, RAW_BPL, 0, RAW_LINES);
+ /* offset */ 0, RAW_BPL, /* padding */ 0,
+ /* skip_lines */ 0, RAW_LINES);
bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
- buf->vb.size/2 , RAW_BPL, 0, RAW_LINES);
+ buf->vb.size/2 , RAW_BPL, 0, 0, RAW_LINES);
}
/* copy format info */
/* calculate geometry */
bttv_calc_geo(btv,&buf->geo,ov->w.width,ov->w.height,
- V4L2_FIELD_HAS_BOTH(ov->field), ov->tvnorm);
+ V4L2_FIELD_HAS_BOTH(ov->field),
+ &bttv_tvnorms[ov->tvnorm],&buf->crop);
/* build risc code */
switch (ov->field) {
(c) 2002 Gerd Knorr <kraxel@bytesex.org>
+ Copyright (C) 2005, 2006 Michael H. Schimek <mschimek@gmx.at>
+ Sponsored by OPQ Systems AB
+
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
to be about 244. */
#define VBI_OFFSET 244
+/* 2048 for compatibility with earlier driver versions. The driver
+ really stores 1024 + tvnorm->vbipack * 4 samples per line in the
+ buffer. Note tvnorm->vbipack is <= 0xFF (limit of VBIPACK_LO + HI
+ is 0x1FF DWORDs) and VBI read()s store a frame counter in the last
+ four bytes of the VBI image. */
+#define VBI_BPL 2048
+
+/* Compatibility. */
#define VBI_DEFLINES 16
-#define VBI_MAXLINES 32
static unsigned int vbibufs = 4;
static unsigned int vbi_debug = 0;
#define dprintk(fmt, arg...) if (vbi_debug) \
printk(KERN_DEBUG "bttv%d/vbi: " fmt, btv->c.nr , ## arg)
+#define IMAGE_SIZE(fmt) \
+ (((fmt)->count[0] + (fmt)->count[1]) * (fmt)->samples_per_line)
+
/* ----------------------------------------------------------------------- */
/* vbi risc code + mm */
-static int
-vbi_buffer_risc(struct bttv *btv, struct bttv_buffer *buf, int lines)
-{
- int bpl = 2048;
-
- bttv_risc_packed(btv, &buf->top, buf->vb.dma.sglist,
- 0, bpl-4, 4, lines);
- bttv_risc_packed(btv, &buf->bottom, buf->vb.dma.sglist,
- lines * bpl, bpl-4, 4, lines);
- return 0;
-}
-
static int vbi_buffer_setup(struct videobuf_queue *q,
unsigned int *count, unsigned int *size)
{
if (0 == *count)
*count = vbibufs;
- *size = fh->lines * 2 * 2048;
- dprintk("setup: lines=%d\n",fh->lines);
+
+ *size = IMAGE_SIZE(&fh->vbi_fmt.fmt);
+
+ dprintk("setup: samples=%u start=%d,%d count=%u,%u\n",
+ fh->vbi_fmt.fmt.samples_per_line,
+ fh->vbi_fmt.fmt.start[0],
+ fh->vbi_fmt.fmt.start[1],
+ fh->vbi_fmt.fmt.count[0],
+ fh->vbi_fmt.fmt.count[1]);
+
return 0;
}
struct bttv_fh *fh = q->priv_data;
struct bttv *btv = fh->btv;
struct bttv_buffer *buf = container_of(vb,struct bttv_buffer,vb);
+ const struct bttv_tvnorm *tvnorm;
+ unsigned int skip_lines0, skip_lines1, min_vdelay;
+ int redo_dma_risc;
int rc;
- buf->vb.size = fh->lines * 2 * 2048;
+ buf->vb.size = IMAGE_SIZE(&fh->vbi_fmt.fmt);
if (0 != buf->vb.baddr && buf->vb.bsize < buf->vb.size)
return -EINVAL;
+ tvnorm = fh->vbi_fmt.tvnorm;
+
+ /* There's no VBI_VDELAY register, RISC must skip the lines
+ we don't want. With default parameters we skip zero lines
+ as earlier driver versions did. The driver permits video
+ standard changes while capturing, so we use vbi_fmt.tvnorm
+ instead of btv->tvnorm to skip zero lines after video
+ standard changes as well. */
+
+ skip_lines0 = 0;
+ skip_lines1 = 0;
+
+ if (fh->vbi_fmt.fmt.count[0] > 0)
+ skip_lines0 = max(0, (fh->vbi_fmt.fmt.start[0]
+ - tvnorm->vbistart[0]));
+ if (fh->vbi_fmt.fmt.count[1] > 0)
+ skip_lines1 = max(0, (fh->vbi_fmt.fmt.start[1]
+ - tvnorm->vbistart[1]));
+
+ redo_dma_risc = 0;
+
+ if (buf->vbi_skip[0] != skip_lines0 ||
+ buf->vbi_skip[1] != skip_lines1 ||
+ buf->vbi_count[0] != fh->vbi_fmt.fmt.count[0] ||
+ buf->vbi_count[1] != fh->vbi_fmt.fmt.count[1]) {
+ buf->vbi_skip[0] = skip_lines0;
+ buf->vbi_skip[1] = skip_lines1;
+ buf->vbi_count[0] = fh->vbi_fmt.fmt.count[0];
+ buf->vbi_count[1] = fh->vbi_fmt.fmt.count[1];
+ redo_dma_risc = 1;
+ }
+
if (STATE_NEEDS_INIT == buf->vb.state) {
+ redo_dma_risc = 1;
if (0 != (rc = videobuf_iolock(q, &buf->vb, NULL)))
goto fail;
- if (0 != (rc = vbi_buffer_risc(btv,buf,fh->lines)))
- goto fail;
}
+
+ if (redo_dma_risc) {
+ unsigned int bpl, padding, offset;
+
+ bpl = 2044; /* max. vbipack */
+ padding = VBI_BPL - bpl;
+
+ if (fh->vbi_fmt.fmt.count[0] > 0) {
+ rc = bttv_risc_packed(btv, &buf->top,
+ buf->vb.dma.sglist,
+ /* offset */ 0, bpl,
+ padding, skip_lines0,
+ fh->vbi_fmt.fmt.count[0]);
+ if (0 != rc)
+ goto fail;
+ }
+
+ if (fh->vbi_fmt.fmt.count[1] > 0) {
+ offset = fh->vbi_fmt.fmt.count[0] * VBI_BPL;
+
+ rc = bttv_risc_packed(btv, &buf->bottom,
+ buf->vb.dma.sglist,
+ offset, bpl,
+ padding, skip_lines1,
+ fh->vbi_fmt.fmt.count[1]);
+ if (0 != rc)
+ goto fail;
+ }
+ }
+
+ /* VBI capturing ends at VDELAY, start of video capturing,
+ no matter where the RISC program ends. VDELAY minimum is 2,
+ bounds.top is the corresponding first field line number
+ times two. VDELAY counts half field lines. */
+ min_vdelay = MIN_VDELAY;
+ if (fh->vbi_fmt.end >= tvnorm->cropcap.bounds.top)
+ min_vdelay += fh->vbi_fmt.end - tvnorm->cropcap.bounds.top;
+
+ /* For bttv_buffer_activate_vbi(). */
+ buf->geo.vdelay = min_vdelay;
+
buf->vb.state = STATE_PREPARED;
buf->vb.field = field;
dprintk("buf prepare %p: top=%p bottom=%p field=%s\n",
/* ----------------------------------------------------------------------- */
-void bttv_vbi_setlines(struct bttv_fh *fh, struct bttv *btv, int lines)
+static int
+try_fmt (struct v4l2_vbi_format * f,
+ const struct bttv_tvnorm * tvnorm,
+ __s32 crop_start)
{
- int vdelay;
-
- if (lines < 1)
- lines = 1;
- if (lines > VBI_MAXLINES)
- lines = VBI_MAXLINES;
- fh->lines = lines;
-
- vdelay = btread(BT848_E_VDELAY_LO);
- if (vdelay < lines*2) {
- vdelay = lines*2;
- btwrite(vdelay,BT848_E_VDELAY_LO);
- btwrite(vdelay,BT848_O_VDELAY_LO);
+ __s32 min_start, max_start, max_end, f2_offset;
+ unsigned int i;
+
+ /* For compatibility with earlier driver versions we must pretend
+ the VBI and video capture window may overlap. In reality RISC
+ magic aborts VBI capturing at the first line of video capturing,
+ leaving the rest of the buffer unchanged, usually all zero.
+ VBI capturing must always start before video capturing. >> 1
+ because cropping counts field lines times two. */
+ min_start = tvnorm->vbistart[0];
+ max_start = (crop_start >> 1) - 1;
+ max_end = (tvnorm->cropcap.bounds.top
+ + tvnorm->cropcap.bounds.height) >> 1;
+
+ if (min_start > max_start)
+ return -EBUSY;
+
+ BUG_ON(max_start >= max_end);
+
+ f->sampling_rate = tvnorm->Fsc;
+ f->samples_per_line = VBI_BPL;
+ f->sample_format = V4L2_PIX_FMT_GREY;
+ f->offset = VBI_OFFSET;
+
+ f2_offset = tvnorm->vbistart[1] - tvnorm->vbistart[0];
+
+ for (i = 0; i < 2; ++i) {
+ if (0 == f->count[i]) {
+ /* No data from this field. We leave f->start[i]
+ alone because VIDIOCSVBIFMT is w/o and EINVALs
+ when a driver does not support exactly the
+ requested parameters. */
+ } else {
+ s64 start, count;
+
+ start = clamp(f->start[i], min_start, max_start);
+ /* s64 to prevent overflow. */
+ count = (s64) f->start[i] + f->count[i] - start;
+ f->start[i] = start;
+ f->count[i] = clamp(count, (s64) 1,
+ max_end - start);
+ }
+
+ min_start += f2_offset;
+ max_start += f2_offset;
+ max_end += f2_offset;
}
+
+ if (0 == (f->count[0] | f->count[1])) {
+ /* As in earlier driver versions. */
+ f->start[0] = tvnorm->vbistart[0];
+ f->start[1] = tvnorm->vbistart[1];
+ f->count[0] = 1;
+ f->count[1] = 1;
+ }
+
+ f->flags = 0;
+
+ f->reserved[0] = 0;
+ f->reserved[1] = 0;
+
+ return 0;
}
-void bttv_vbi_try_fmt(struct bttv_fh *fh, struct v4l2_format *f)
+int
+bttv_vbi_try_fmt (struct bttv_fh * fh,
+ struct v4l2_vbi_format * f)
{
+ struct bttv *btv = fh->btv;
const struct bttv_tvnorm *tvnorm;
- s64 count0,count1,count;
+ __s32 crop_start;
- tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
- f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
- f->fmt.vbi.sampling_rate = tvnorm->Fsc;
- f->fmt.vbi.samples_per_line = 2048;
- f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
- f->fmt.vbi.offset = VBI_OFFSET;
- f->fmt.vbi.flags = 0;
-
- /* s64 to prevent overflow. */
- count0 = (s64) f->fmt.vbi.start[0] + f->fmt.vbi.count[0]
- - tvnorm->vbistart[0];
- count1 = (s64) f->fmt.vbi.start[1] + f->fmt.vbi.count[1]
- - tvnorm->vbistart[1];
- count = clamp (max (count0, count1), (s64) 1, (s64) VBI_MAXLINES);
-
- f->fmt.vbi.start[0] = tvnorm->vbistart[0];
- f->fmt.vbi.start[1] = tvnorm->vbistart[1];
- f->fmt.vbi.count[0] = count;
- f->fmt.vbi.count[1] = count;
-
- f->fmt.vbi.reserved[0] = 0;
- f->fmt.vbi.reserved[1] = 0;
+ mutex_lock(&btv->lock);
+
+ tvnorm = &bttv_tvnorms[btv->tvnorm];
+ crop_start = btv->crop_start;
+
+ mutex_unlock(&btv->lock);
+
+ return try_fmt(f, tvnorm, crop_start);
}
-void bttv_vbi_get_fmt(struct bttv_fh *fh, struct v4l2_format *f)
+int
+bttv_vbi_set_fmt (struct bttv_fh * fh,
+ struct v4l2_vbi_format * f)
{
+ struct bttv *btv = fh->btv;
const struct bttv_tvnorm *tvnorm;
+ __s32 start1, end;
+ int rc;
+
+ mutex_lock(&btv->lock);
+
+ rc = -EBUSY;
+ if (fh->resources & RESOURCE_VBI)
+ goto fail;
+
+ tvnorm = &bttv_tvnorms[btv->tvnorm];
+
+ rc = try_fmt(f, tvnorm, btv->crop_start);
+ if (0 != rc)
+ goto fail;
+
+ start1 = f->start[1] - tvnorm->vbistart[1] + tvnorm->vbistart[0];
+
+ /* First possible line of video capturing. Should be
+ max(f->start[0] + f->count[0], start1 + f->count[1]) * 2
+ when capturing both fields. But for compatibility we must
+ pretend the VBI and video capture window may overlap,
+ so end = start + 1, the lowest possible value, times two
+ because vbi_fmt.end counts field lines times two. */
+ end = max(f->start[0], start1) * 2 + 2;
+
+ mutex_lock(&fh->vbi.lock);
+
+ fh->vbi_fmt.fmt = *f;
+ fh->vbi_fmt.tvnorm = tvnorm;
+ fh->vbi_fmt.end = end;
+
+ mutex_unlock(&fh->vbi.lock);
+
+ rc = 0;
+
+ fail:
+ mutex_unlock(&btv->lock);
+
+ return rc;
+}
+
+void
+bttv_vbi_get_fmt (struct bttv_fh * fh,
+ struct v4l2_vbi_format * f)
+{
+ const struct bttv_tvnorm *tvnorm;
+
+ *f = fh->vbi_fmt.fmt;
tvnorm = &bttv_tvnorms[fh->btv->tvnorm];
- memset(f,0,sizeof(*f));
- f->type = V4L2_BUF_TYPE_VBI_CAPTURE;
- f->fmt.vbi.sampling_rate = tvnorm->Fsc;
- f->fmt.vbi.samples_per_line = 2048;
- f->fmt.vbi.sample_format = V4L2_PIX_FMT_GREY;
- f->fmt.vbi.offset = VBI_OFFSET;
- f->fmt.vbi.start[0] = tvnorm->vbistart[0];
- f->fmt.vbi.start[1] = tvnorm->vbistart[1];
- f->fmt.vbi.count[0] = fh->lines;
- f->fmt.vbi.count[1] = fh->lines;
- f->fmt.vbi.flags = 0;
+
+ if (tvnorm != fh->vbi_fmt.tvnorm) {
+ __s32 max_end;
+ unsigned int i;
+
+ /* As in vbi_buffer_prepare() this imitates the
+ behaviour of earlier driver versions after video
+ standard changes, with default parameters anyway. */
+
+ max_end = (tvnorm->cropcap.bounds.top
+ + tvnorm->cropcap.bounds.height) >> 1;
+
+ f->sampling_rate = tvnorm->Fsc;
+
+ for (i = 0; i < 2; ++i) {
+ __s32 new_start;
+
+ new_start = f->start[i]
+ + tvnorm->vbistart[i]
+ - fh->vbi_fmt.tvnorm->vbistart[i];
+
+ f->start[i] = min(new_start, max_end - 1);
+ f->count[i] = min((__s32) f->count[i],
+ max_end - f->start[i]);
+
+ max_end += tvnorm->vbistart[1]
+ - tvnorm->vbistart[0];
+ }
+ }
+}
+
+void
+bttv_vbi_fmt_reset (struct bttv_vbi_fmt * f,
+ int norm)
+{
+ const struct bttv_tvnorm *tvnorm;
+ unsigned int real_samples_per_line;
+ unsigned int real_count;
+
+ tvnorm = &bttv_tvnorms[norm];
+
+ f->fmt.sampling_rate = tvnorm->Fsc;
+ f->fmt.samples_per_line = VBI_BPL;
+ f->fmt.sample_format = V4L2_PIX_FMT_GREY;
+ f->fmt.offset = VBI_OFFSET;
+ f->fmt.start[0] = tvnorm->vbistart[0];
+ f->fmt.start[1] = tvnorm->vbistart[1];
+ f->fmt.count[0] = VBI_DEFLINES;
+ f->fmt.count[1] = VBI_DEFLINES;
+ f->fmt.flags = 0;
+ f->fmt.reserved[0] = 0;
+ f->fmt.reserved[1] = 0;
+
+ /* For compatibility the buffer size must be 2 * VBI_DEFLINES *
+ VBI_BPL regardless of the current video standard. */
+ real_samples_per_line = 1024 + tvnorm->vbipack * 4;
+ real_count = ((tvnorm->cropcap.defrect.top >> 1)
+ - tvnorm->vbistart[0]);
+
+ BUG_ON(real_samples_per_line > VBI_BPL);
+ BUG_ON(real_count > VBI_DEFLINES);
+
+ f->tvnorm = tvnorm;
+
+ /* See bttv_vbi_fmt_set(). */
+ f->end = tvnorm->vbistart[0] * 2 + 2;
}
/* ----------------------------------------------------------------------- */
projects / linux-2.6 / commitdiff