Currently, em28xx driver outputs webcams only at RGB565 format. However,
several webcam applications don't support this format.
In order to properly work with those applications, a RGB565 handler should be
added at libv4l.
Tested with Silvercrest 1.3 mpix with v4l2grab (V4L2, with native libv4l
support) and two LD_PRELOAD applications: camorama (V4L1 API) and skype (using compat32).
Signed-off-by: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
diff --git a/v4l2-apps/libv4l/libv4lconvert/libv4lconvert-priv.h b/v4l2-apps/libv4l/libv4lconvert/libv4lconvert-priv.h
--- a/v4l2-apps/libv4l/libv4lconvert/libv4lconvert-priv.h
+++ b/v4l2-apps/libv4l/libv4lconvert/libv4lconvert-priv.h
@@ -184,6 +184,15 @@ void v4lconvert_swap_rgb(const unsigned
void v4lconvert_swap_uv(const unsigned char *src, unsigned char *dst,
const struct v4l2_format *src_fmt);
+void v4lconvert_rgb565_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height);
+
+void v4lconvert_rgb565_to_bgr24(const unsigned char *src, unsigned char *dest,
+ int width, int height);
+
+void v4lconvert_rgb565_to_yuv420(const unsigned char *src, unsigned char *dest,
+ const struct v4l2_format *src_fmt, int yvu);
+
void v4lconvert_spca501_to_yuv420(const unsigned char *src, unsigned char *dst,
int width, int height, int yvu);
diff --git a/v4l2-apps/libv4l/libv4lconvert/libv4lconvert.c b/v4l2-apps/libv4l/libv4lconvert/libv4lconvert.c
--- a/v4l2-apps/libv4l/libv4lconvert/libv4lconvert.c
+++ b/v4l2-apps/libv4l/libv4lconvert/libv4lconvert.c
@@ -46,6 +46,7 @@ static const struct v4lconvert_pixfmt su
{ V4L2_PIX_FMT_YUYV, 0 },
{ V4L2_PIX_FMT_YVYU, 0 },
{ V4L2_PIX_FMT_UYVY, 0 },
+ { V4L2_PIX_FMT_RGB565, 0 },
{ V4L2_PIX_FMT_SN9C20X_I420, V4LCONVERT_NEEDS_CONVERSION },
{ V4L2_PIX_FMT_SBGGR8, V4LCONVERT_NEEDS_CONVERSION },
{ V4L2_PIX_FMT_SGBRG8, V4LCONVERT_NEEDS_CONVERSION },
@@ -787,6 +788,23 @@ static int v4lconvert_convert_pixfmt(str
}
break;
+ case V4L2_PIX_FMT_RGB565:
+ switch (dest_pix_fmt) {
+ case V4L2_PIX_FMT_RGB24:
+ v4lconvert_rgb565_to_rgb24(src, dest, width, height);
+ break;
+ case V4L2_PIX_FMT_BGR24:
+ v4lconvert_rgb565_to_bgr24(src, dest, width, height);
+ break;
+ case V4L2_PIX_FMT_YUV420:
+ v4lconvert_rgb565_to_yuv420(src, dest, fmt, 0);
+ break;
+ case V4L2_PIX_FMT_YVU420:
+ v4lconvert_rgb565_to_yuv420(src, dest, fmt, 1);
+ break;
+ }
+ break;
+
case V4L2_PIX_FMT_RGB24:
switch (dest_pix_fmt) {
case V4L2_PIX_FMT_BGR24:
diff --git a/v4l2-apps/libv4l/libv4lconvert/rgbyuv.c b/v4l2-apps/libv4l/libv4lconvert/rgbyuv.c
--- a/v4l2-apps/libv4l/libv4lconvert/rgbyuv.c
+++ b/v4l2-apps/libv4l/libv4lconvert/rgbyuv.c
@@ -1,8 +1,10 @@
/*
# RGB <-> YUV conversion routines
+# (C) 2008 Hans de Goede <j.w.r.degoede@xxxxxx>
-# (C) 2008 Hans de Goede <j.w.r.degoede@xxxxxx>
+# RGB565 conversion routines
+# (C) 2009 Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU Lesser General Public License as published by
@@ -472,3 +474,103 @@ void v4lconvert_swap_uv(const unsigned c
src += src_fmt->fmt.pix.bytesperline / 2;
}
}
+
+void v4lconvert_rgb565_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int j;
+ while (--height >= 0) {
+ for (j = 0; j < width; j++) {
+ unsigned short tmp = *(unsigned short *)src;
+
+ /* Original format: rrrrrggg gggbbbbb */
+ *dest++ = 0xf8 & (tmp >> 8);
+ *dest++ = 0xfc & (tmp >> 3);
+ *dest++ = 0xf8 & (tmp << 3);
+
+ src += 2;
+ }
+ }
+}
+
+void v4lconvert_rgb565_to_bgr24(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int j;
+ while (--height >= 0) {
+ for (j = 0; j < width; j++) {
+ unsigned short tmp = *(unsigned short *)src;
+
+ /* Original format: rrrrrggg gggbbbbb */
+ *dest++ = 0xf8 & (tmp << 3);
+ *dest++ = 0xfc & (tmp >> 3);
+ *dest++ = 0xf8 & (tmp >> 8);
+
+ src += 2;
+ }
+ }
+}
+
+void v4lconvert_rgb565_to_yuv420(const unsigned char *src, unsigned char *dest,
+ const struct v4l2_format *src_fmt, int yvu)
+{
+ int x, y;
+ unsigned short tmp;
+ unsigned char *udest, *vdest;
+ unsigned r[4], g[4], b[4];
+ int avg_src[3];
+
+ /* Y */
+ for (y = 0; y < src_fmt->fmt.pix.height; y++) {
+ for (x = 0; x < src_fmt->fmt.pix.width; x++) {
+ tmp = *(unsigned short *)src;
+ r[0] = 0xf8 & (tmp << 3);
+ g[0] = 0xfc & (tmp >> 3);
+ b[0] = 0xf8 & (tmp >> 8);
+ RGB2Y(r[0], g[0], b[0], *dest++);
+ src += 2;
+ }
+ src += src_fmt->fmt.pix.bytesperline - 2 * src_fmt->fmt.pix.width;
+ }
+ src -= src_fmt->fmt.pix.height * src_fmt->fmt.pix.bytesperline;
+
+ /* U + V */
+ if (yvu) {
+ vdest = dest;
+ udest = dest + src_fmt->fmt.pix.width * src_fmt->fmt.pix.height / 4;
+ } else {
+ udest = dest;
+ vdest = dest + src_fmt->fmt.pix.width * src_fmt->fmt.pix.height / 4;
+ }
+
+ for (y = 0; y < src_fmt->fmt.pix.height / 2; y++) {
+ for (x = 0; x < src_fmt->fmt.pix.width / 2; x++) {
+ tmp = *(unsigned short *)src;
+ r[0] = 0xf8 & (tmp << 3);
+ g[0] = 0xfc & (tmp >> 3);
+ b[0] = 0xf8 & (tmp >> 8);
+
+ tmp = *(((unsigned short *)src) + 1);
+ r[1] = 0xf8 & (tmp << 3);
+ g[1] = 0xfc & (tmp >> 3);
+ b[1] = 0xf8 & (tmp >> 8);
+
+ tmp = *(((unsigned short *)src) + src_fmt->fmt.pix.bytesperline);
+ r[2] = 0xf8 & (tmp << 3);
+ g[2] = 0xfc & (tmp >> 3);
+ b[2] = 0xf8 & (tmp >> 8);
+
+ tmp = *(((unsigned short *)src) + src_fmt->fmt.pix.bytesperline + 1);
+ r[3] = 0xf8 & (tmp << 3);
+ g[3] = 0xfc & (tmp >> 3);
+ b[3] = 0xf8 & (tmp >> 8);
+
+ avg_src[0] = (r[0] + r[1] + r[2] + r[3]) /4;
+ avg_src[1] = (g[0] + g[1] + g[2] + g[3]) /4;
+ avg_src[2] = (b[0] + b[1] + b[2] + b[3]) /4;
+ RGB2UV(avg_src[0], avg_src[1], avg_src[2], *udest++, *vdest++);
+ src += 4;
+ }
+ src += 2 * src_fmt->fmt.pix.bytesperline - 2 * src_fmt->fmt.pix.width;
+ }
+}
--
Cheers,
Mauro
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