[PATCH 4/4] usbvision: remove RGB format conversion
From: Ondrej Zary
Date: Wed Apr 27 2011 - 16:41:58 EST
As V4L2 spec says that drivers shouldn't do any in-kernel image format
conversion, remove it.
Signed-off-by: Ondrej Zary <linux@xxxxxxxxxxxxxxxxxxxx>
---
Feel free to drop this patch if the functionality is needed.
diff -up linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision-core.c linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision-core.c
--- linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision-core.c 2011-04-27 22:18:52.000000000 +0200
+++ linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision-core.c 2011-04-27 22:18:27.000000000 +0200
@@ -494,9 +494,8 @@ static enum parse_state usbvision_parse_
int len;
int i;
unsigned char yuyv[4] = { 180, 128, 10, 128 }; /* YUV components */
- unsigned char rv, gv, bv; /* RGB components */
- int clipmask_index, bytes_per_pixel;
- int stretch_bytes, clipmask_add;
+ int bytes_per_pixel;
+ int stretch_bytes;
frame = usbvision->cur_frame;
f = frame->data + (frame->v4l2_linesize * frame->curline);
@@ -513,78 +512,16 @@ static enum parse_state usbvision_parse_
bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
- clipmask_index = frame->curline * MAX_FRAME_WIDTH;
- clipmask_add = usbvision->stretch_width;
for (i = 0; i < frame->frmwidth; i += (2 * usbvision->stretch_width)) {
scratch_get(usbvision, &yuyv[0], 4);
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f++ = yuyv[0]; /* Y */
- *f++ = yuyv[3]; /* U */
- } else {
- YUV_TO_RGB_BY_THE_BOOK(yuyv[0], yuyv[1], yuyv[3], rv, gv, bv);
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x07 & (gv >> 3)) |
- (0xF8 & bv);
- break;
- case V4L2_PIX_FMT_RGB24:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- break;
- case V4L2_PIX_FMT_RGB32:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- f++;
- break;
- case V4L2_PIX_FMT_RGB555:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x03 & (gv >> 3)) |
- (0x7C & (bv << 2));
- break;
- }
- }
- clipmask_index += clipmask_add;
+ *f++ = yuyv[0]; /* Y */
+ *f++ = yuyv[3]; /* U */
f += stretch_bytes;
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f++ = yuyv[2]; /* Y */
- *f++ = yuyv[1]; /* V */
- } else {
- YUV_TO_RGB_BY_THE_BOOK(yuyv[2], yuyv[1], yuyv[3], rv, gv, bv);
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x07 & (gv >> 3)) |
- (0xF8 & bv);
- break;
- case V4L2_PIX_FMT_RGB24:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- break;
- case V4L2_PIX_FMT_RGB32:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- f++;
- break;
- case V4L2_PIX_FMT_RGB555:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x03 & (gv >> 3)) |
- (0x7C & (bv << 2));
- break;
- }
- }
- clipmask_index += clipmask_add;
+ *f++ = yuyv[2]; /* Y */
+ *f++ = yuyv[1]; /* V */
f += stretch_bytes;
}
@@ -702,22 +639,20 @@ static enum parse_state usbvision_parse_
unsigned char strip_data[USBVISION_STRIP_LEN_MAX];
unsigned char strip_header[USBVISION_STRIP_HEADER_LEN];
int idx, idx_end, strip_len, strip_ptr, startblock_pos, block_pos, block_type_pos;
- int clipmask_index, bytes_per_pixel, rc;
+ int bytes_per_pixel, rc;
int image_size;
- unsigned char rv, gv, bv;
static unsigned char *Y, *U, *V;
frame = usbvision->cur_frame;
image_size = frame->frmwidth * frame->frmheight;
f = frame->data + (frame->v4l2_linesize * frame->curline);
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) { /* initialise u and v pointers */
- /* get base of u and b planes add halfoffset */
- u = frame->data
- + image_size
- + (frame->frmwidth >> 1) * frame->curline;
- v = u + (image_size >> 1);
- }
+ /* initialise u and v pointers */
+ /* get base of u and b planes add halfoffset */
+ u = frame->data
+ + image_size
+ + (frame->frmwidth >> 1) * frame->curline;
+ v = u + (image_size >> 1);
if (frame->curline == 0)
usbvision_adjust_compression(usbvision);
@@ -762,7 +697,6 @@ static enum parse_state usbvision_parse_
}
bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
- clipmask_index = frame->curline * MAX_FRAME_WIDTH;
scratch_get(usbvision, strip_data, strip_len);
@@ -788,41 +722,8 @@ static enum parse_state usbvision_parse_
usbvision->strip_len_errors++;
for (idx = 0; idx < idx_end; idx++) {
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f++ = Y[idx];
- *f++ = idx & 0x01 ? U[idx / 2] : V[idx / 2];
- } else {
- YUV_TO_RGB_BY_THE_BOOK(Y[idx], U[idx / 2], V[idx / 2], rv, gv, bv);
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_GREY:
- *f++ = Y[idx];
- break;
- case V4L2_PIX_FMT_RGB555:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x03 & (gv >> 3)) |
- (0x7C & (bv << 2));
- break;
- case V4L2_PIX_FMT_RGB565:
- *f++ = (0x1F & rv) |
- (0xE0 & (gv << 5));
- *f++ = (0x07 & (gv >> 3)) |
- (0xF8 & bv);
- break;
- case V4L2_PIX_FMT_RGB24:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- break;
- case V4L2_PIX_FMT_RGB32:
- *f++ = rv;
- *f++ = gv;
- *f++ = bv;
- f++;
- break;
- }
- }
- clipmask_index++;
+ *f++ = Y[idx];
+ *f++ = idx & 0x01 ? U[idx / 2] : V[idx / 2];
}
*pcopylen += frame->v4l2_linesize;
@@ -857,11 +758,8 @@ static enum parse_state usbvision_parse_
const int y_step[] = { 0, 0, 0, 2 }, y_step_size = 4;
const int uv_step[] = { 0, 0, 0, 4 }, uv_step_size = 4;
unsigned char y[2], u, v; /* YUV components */
- int y_, u_, v_, vb, uvg, ur;
- int r_, g_, b_; /* RGB components */
- unsigned char g;
- int clipmask_even_index, clipmask_odd_index, bytes_per_pixel;
- int clipmask_add, stretch_bytes;
+ int bytes_per_pixel;
+ int stretch_bytes;
frame = usbvision->cur_frame;
f_even = frame->data + (frame->v4l2_linesize * frame->curline);
@@ -872,9 +770,6 @@ static enum parse_state usbvision_parse_
/* I need two lines to decode the color */
bytes_per_pixel = frame->v4l2_format.bytes_per_pixel;
stretch_bytes = (usbvision->stretch_width - 1) * bytes_per_pixel;
- clipmask_even_index = frame->curline * MAX_FRAME_WIDTH;
- clipmask_odd_index = clipmask_even_index + MAX_FRAME_WIDTH;
- clipmask_add = usbvision->stretch_width;
pixel_per_line = frame->isoc_header.frame_width;
if (scratch_len(usbvision) < (int)pixel_per_line * 3) {
@@ -901,185 +796,22 @@ static enum parse_state usbvision_parse_
scratch_get_extra(usbvision, &u, &u_ptr, 1);
scratch_get_extra(usbvision, &v, &v_ptr, 1);
- /* I don't use the YUV_TO_RGB macro for better performance */
- v_ = v - 128;
- u_ = u - 128;
- vb = 132252 * v_;
- uvg = -53281 * u_ - 25625 * v_;
- ur = 104595 * u_;
-
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f_even++ = y[0];
- *f_even++ = v;
- } else {
- y_ = 76284 * (y[0] - 16);
-
- b_ = (y_ + vb) >> 16;
- g_ = (y_ + uvg) >> 16;
- r_ = (y_ + ur) >> 16;
-
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- g = LIMIT_RGB(g_);
- *f_even++ =
- (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_even++ =
- (0x07 & (g >> 3)) |
- (0xF8 & LIMIT_RGB(b_));
- break;
- case V4L2_PIX_FMT_RGB24:
- *f_even++ = LIMIT_RGB(r_);
- *f_even++ = LIMIT_RGB(g_);
- *f_even++ = LIMIT_RGB(b_);
- break;
- case V4L2_PIX_FMT_RGB32:
- *f_even++ = LIMIT_RGB(r_);
- *f_even++ = LIMIT_RGB(g_);
- *f_even++ = LIMIT_RGB(b_);
- f_even++;
- break;
- case V4L2_PIX_FMT_RGB555:
- g = LIMIT_RGB(g_);
- *f_even++ = (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_even++ = (0x03 & (g >> 3)) |
- (0x7C & (LIMIT_RGB(b_) << 2));
- break;
- }
- }
- clipmask_even_index += clipmask_add;
+ *f_even++ = y[0];
+ *f_even++ = v;
f_even += stretch_bytes;
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f_even++ = y[1];
- *f_even++ = u;
- } else {
- y_ = 76284 * (y[1] - 16);
-
- b_ = (y_ + vb) >> 16;
- g_ = (y_ + uvg) >> 16;
- r_ = (y_ + ur) >> 16;
-
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- g = LIMIT_RGB(g_);
- *f_even++ =
- (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_even++ =
- (0x07 & (g >> 3)) |
- (0xF8 & LIMIT_RGB(b_));
- break;
- case V4L2_PIX_FMT_RGB24:
- *f_even++ = LIMIT_RGB(r_);
- *f_even++ = LIMIT_RGB(g_);
- *f_even++ = LIMIT_RGB(b_);
- break;
- case V4L2_PIX_FMT_RGB32:
- *f_even++ = LIMIT_RGB(r_);
- *f_even++ = LIMIT_RGB(g_);
- *f_even++ = LIMIT_RGB(b_);
- f_even++;
- break;
- case V4L2_PIX_FMT_RGB555:
- g = LIMIT_RGB(g_);
- *f_even++ = (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_even++ = (0x03 & (g >> 3)) |
- (0x7C & (LIMIT_RGB(b_) << 2));
- break;
- }
- }
- clipmask_even_index += clipmask_add;
+ *f_even++ = y[1];
+ *f_even++ = u;
f_even += stretch_bytes;
scratch_get_extra(usbvision, &y[0], &y_ptr, 2);
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f_odd++ = y[0];
- *f_odd++ = v;
- } else {
- y_ = 76284 * (y[0] - 16);
-
- b_ = (y_ + vb) >> 16;
- g_ = (y_ + uvg) >> 16;
- r_ = (y_ + ur) >> 16;
-
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- g = LIMIT_RGB(g_);
- *f_odd++ =
- (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_odd++ =
- (0x07 & (g >> 3)) |
- (0xF8 & LIMIT_RGB(b_));
- break;
- case V4L2_PIX_FMT_RGB24:
- *f_odd++ = LIMIT_RGB(r_);
- *f_odd++ = LIMIT_RGB(g_);
- *f_odd++ = LIMIT_RGB(b_);
- break;
- case V4L2_PIX_FMT_RGB32:
- *f_odd++ = LIMIT_RGB(r_);
- *f_odd++ = LIMIT_RGB(g_);
- *f_odd++ = LIMIT_RGB(b_);
- f_odd++;
- break;
- case V4L2_PIX_FMT_RGB555:
- g = LIMIT_RGB(g_);
- *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_odd++ = (0x03 & (g >> 3)) |
- (0x7C & (LIMIT_RGB(b_) << 2));
- break;
- }
- }
- clipmask_odd_index += clipmask_add;
+ *f_odd++ = y[0];
+ *f_odd++ = v;
f_odd += stretch_bytes;
- if (frame->v4l2_format.format == V4L2_PIX_FMT_YUYV) {
- *f_odd++ = y[1];
- *f_odd++ = u;
- } else {
- y_ = 76284 * (y[1] - 16);
-
- b_ = (y_ + vb) >> 16;
- g_ = (y_ + uvg) >> 16;
- r_ = (y_ + ur) >> 16;
-
- switch (frame->v4l2_format.format) {
- case V4L2_PIX_FMT_RGB565:
- g = LIMIT_RGB(g_);
- *f_odd++ =
- (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_odd++ =
- (0x07 & (g >> 3)) |
- (0xF8 & LIMIT_RGB(b_));
- break;
- case V4L2_PIX_FMT_RGB24:
- *f_odd++ = LIMIT_RGB(r_);
- *f_odd++ = LIMIT_RGB(g_);
- *f_odd++ = LIMIT_RGB(b_);
- break;
- case V4L2_PIX_FMT_RGB32:
- *f_odd++ = LIMIT_RGB(r_);
- *f_odd++ = LIMIT_RGB(g_);
- *f_odd++ = LIMIT_RGB(b_);
- f_odd++;
- break;
- case V4L2_PIX_FMT_RGB555:
- g = LIMIT_RGB(g_);
- *f_odd++ = (0x1F & LIMIT_RGB(r_)) |
- (0xE0 & (g << 5));
- *f_odd++ = (0x03 & (g >> 3)) |
- (0x7C & (LIMIT_RGB(b_) << 2));
- break;
- }
- }
- clipmask_odd_index += clipmask_add;
+ *f_odd++ = y[1];
+ *f_odd++ = u;
f_odd += stretch_bytes;
}
diff -up linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision.h linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision.h
--- linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision.h 2011-04-27 22:05:39.000000000 +0200
+++ linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision.h 2011-04-27 22:18:27.000000000 +0200
@@ -170,48 +170,6 @@ enum {
{ if ((v) < (mi)) (v) = (mi); else if ((v) > (ma)) (v) = (ma); }
/*
- * We use macros to do YUV -> RGB conversion because this is
- * very important for speed and totally unimportant for size.
- *
- * YUV -> RGB Conversion
- * ---------------------
- *
- * B = 1.164*(Y-16) + 2.018*(V-128)
- * G = 1.164*(Y-16) - 0.813*(U-128) - 0.391*(V-128)
- * R = 1.164*(Y-16) + 1.596*(U-128)
- *
- * If you fancy integer arithmetics (as you should), hear this:
- *
- * 65536*B = 76284*(Y-16) + 132252*(V-128)
- * 65536*G = 76284*(Y-16) - 53281*(U-128) - 25625*(V-128)
- * 65536*R = 76284*(Y-16) + 104595*(U-128)
- *
- * Make sure the output values are within [0..255] range.
- */
-#define LIMIT_RGB(x) (((x) < 0) ? 0 : (((x) > 255) ? 255 : (x)))
-#define YUV_TO_RGB_BY_THE_BOOK(my, mu, mv, mr, mg, mb) { \
- int mm_y, mm_yc, mm_u, mm_v, mm_r, mm_g, mm_b; \
- mm_y = (my) - 16; \
- mm_u = (mu) - 128; \
- mm_v = (mv) - 128; \
- mm_yc = mm_y * 76284; \
- mm_b = (mm_yc + 132252 * mm_v) >> 16; \
- mm_g = (mm_yc - 53281 * mm_u - 25625 * mm_v) >> 16; \
- mm_r = (mm_yc + 104595 * mm_u) >> 16; \
- mb = LIMIT_RGB(mm_b); \
- mg = LIMIT_RGB(mm_g); \
- mr = LIMIT_RGB(mm_r); \
-}
-
-/* Debugging aid */
-#define USBVISION_SAY_AND_WAIT(what) { \
- wait_queue_head_t wq; \
- init_waitqueue_head(&wq); \
- printk(KERN_INFO "Say: %s\n", what); \
- interruptible_sleep_on_timeout(&wq, HZ * 3); \
-}
-
-/*
* This macro checks if usbvision is still operational. The 'usbvision'
* pointer must be valid, usbvision->dev must be valid, we are not
* removing the device and the device has not erred on us.
diff -up linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision-video.c linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision-video.c
--- linux-2.6.39-rc2-/drivers/media/video/usbvision/usbvision-video.c 2011-04-27 22:08:32.000000000 +0200
+++ linux-2.6.39-rc2/drivers/media/video/usbvision/usbvision-video.c 2011-04-27 22:18:27.000000000 +0200
@@ -112,11 +112,6 @@ USBVISION_DRIVER_VERSION_PATCHLEVEL)
static int usbvision_nr;
static struct usbvision_v4l2_format_st usbvision_v4l2_format[] = {
- { 1, 1, 8, V4L2_PIX_FMT_GREY , "GREY" },
- { 1, 2, 16, V4L2_PIX_FMT_RGB565 , "RGB565" },
- { 1, 3, 24, V4L2_PIX_FMT_RGB24 , "RGB24" },
- { 1, 4, 32, V4L2_PIX_FMT_RGB32 , "RGB32" },
- { 1, 2, 16, V4L2_PIX_FMT_RGB555 , "RGB555" },
{ 1, 2, 16, V4L2_PIX_FMT_YUYV , "YUV422" },
};
@@ -1452,7 +1447,7 @@ static void usbvision_configure_video(st
return;
model = usbvision->dev_model;
- usbvision->palette = usbvision_v4l2_format[2]; /* V4L2_PIX_FMT_RGB24; */
+ usbvision->palette = usbvision_v4l2_format[0];
if (usbvision_device_data[usbvision->dev_model].vin_reg2_override) {
usbvision->vin_reg2_preset =
--
Ondrej Zary
--
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