* [PATCH] v4l library YVYU decoding
@ 2008-09-01 8:04 Jean-Francois Moine
2008-09-03 12:46 ` Hans de Goede
0 siblings, 1 reply; 2+ messages in thread
From: Jean-Francois Moine @ 2008-09-01 8:04 UTC (permalink / raw)
To: Hans de Goede; +Cc: Video 4 Linux
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Hi Hans,
Here is a new YVYU decoding patch which replaces the previous one.
Sorry for it is not tested: the webcam 046d:0896 does not work well.
Cheers.
--
Ken ar c'hentañ | ** Breizh ha Linux atav! **
Jef | http://moinejf.free.fr/
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This patch adds the decoding of YVYU images generated by vc0321.
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
--- v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert-priv.h.orig 2008-08-29 14:00:57.000000000 +0200
+++ v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert-priv.h 2008-08-31 16:31:40.000000000 +0200
@@ -59,6 +59,10 @@
#define V4L2_PIX_FMT_SRGGB8 v4l2_fourcc('R','G','G','B')
#endif
+#ifndef V4L2_PIX_FMT_YVYU
+#define V4L2_PIX_FMT_YVYU v4l2_fourcc('Y', 'V', 'Y', 'U')
+#endif
+
#define V4LCONVERT_ERROR_MSG_SIZE 256
#define V4LCONVERT_ERR(...) \
@@ -87,6 +91,15 @@
void v4lconvert_yuv420_to_bgr24(const unsigned char *src, unsigned char *dst,
int width, int height);
+void v4lconvert_yvyu_to_rgb24(const unsigned char *src, unsigned char *dst,
+ int width, int height);
+
+void v4lconvert_yvyu_to_bgr24(const unsigned char *src, unsigned char *dst,
+ int width, int height);
+
+void v4lconvert_yvyu_to_yuv420(const unsigned char *src, unsigned char *dst,
+ int width, int height);
+
void v4lconvert_swap_rgb(const unsigned char *src, unsigned char *dst,
int width, int height);
--- v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert.c.orig 2008-08-29 14:00:57.000000000 +0200
+++ v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/libv4lconvert.c 2008-08-31 15:47:58.000000000 +0200
@@ -49,6 +49,7 @@
V4L2_PIX_FMT_SN9C10X,
V4L2_PIX_FMT_PAC207,
V4L2_PIX_FMT_PJPG,
+ V4L2_PIX_FMT_YVYU,
};
static const unsigned int supported_dst_pixfmts[] = {
@@ -518,6 +519,23 @@
}
break;
+ case V4L2_PIX_FMT_YVYU:
+ switch (dest_fmt->fmt.pix.pixelformat) {
+ case V4L2_PIX_FMT_RGB24:
+ v4lconvert_yvyu_to_rgb24(src, dest, dest_fmt->fmt.pix.width,
+ dest_fmt->fmt.pix.height);
+ break;
+ case V4L2_PIX_FMT_BGR24:
+ v4lconvert_yvyu_to_bgr24(src, dest, dest_fmt->fmt.pix.width,
+ dest_fmt->fmt.pix.height);
+ break;
+ default:
+ v4lconvert_yvyu_to_yuv420(src, dest, dest_fmt->fmt.pix.width,
+ dest_fmt->fmt.pix.height);
+ break;
+ }
+ break;
+
default:
V4LCONVERT_ERR("Unknown src format in conversion\n");
errno = EINVAL;
--- v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/rgbyuv.c.orig 2008-08-29 14:00:57.000000000 +0200
+++ v4l-dvb-423381bc0d61/v4l2-apps/lib/libv4l/libv4lconvert/rgbyuv.c 2008-08-31 16:44:29.000000000 +0200
@@ -130,6 +130,91 @@
}
}
+void v4lconvert_yvyu_to_bgr24(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int j;
+
+ while (--height >= 0) {
+ for (j = 0; j < width; j += 2) {
+ int u = src[3];
+ int v = src[1];
+ int u1 = (((u - 128) << 7) + (u - 128)) >> 6;
+ int rg = (((u - 128) << 1) + (u - 128) +
+ ((v - 128) << 2) + ((v - 128) << 1)) >> 3;
+ int v1 = (((v - 128) << 1) + (v - 128)) >> 1;
+
+ *dest++ = CLIP(*src + u1);
+ *dest++ = CLIP(*src - rg);
+ *dest++ = CLIP(*src + v1);
+
+ *dest++ = CLIP(src[2] + u1);
+ *dest++ = CLIP(src[2] - rg);
+ *dest++ = CLIP(src[2] + v1);
+ src += 4;
+ }
+ }
+}
+
+void v4lconvert_yvyu_to_rgb24(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int j;
+
+ while (--height >= 0) {
+ for (j = 0; j < width; j += 2) {
+ int u = src[3];
+ int v = src[1];
+ int u1 = (((u - 128) << 7) + (u - 128)) >> 6;
+ int rg = (((u - 128) << 1) + (u - 128) +
+ ((v - 128) << 2) + ((v - 128) << 1)) >> 3;
+ int v1 = (((v - 128) << 1) + (v - 128)) >> 1;
+
+ *dest++ = CLIP(*src + v1);
+ *dest++ = CLIP(*src - rg);
+ *dest++ = CLIP(*src + u1);
+
+ *dest++ = CLIP(src[2] + v1);
+ *dest++ = CLIP(src[2] - rg);
+ *dest++ = CLIP(src[2] + u1);
+ src += 4;
+ }
+ }
+}
+
+void v4lconvert_yvyu_to_yuv420(const unsigned char *src, unsigned char *dest,
+ int width, int height)
+{
+ int i, j;
+ const unsigned char *src1;
+ unsigned char *vdest;
+
+ /* copy the Y values */
+ src1 = src;
+ for (i = 0; i < height; i++) {
+ for (j = 0; j < width; j += 2) {
+ *dest++ = *src1;
+ *dest++ = src1[2];
+ src1 += 4;
+ }
+ }
+
+ /* copy the U and V values */
+ src++; /* point to V */
+ src1 = src + width * 2; /* next line */
+ vdest = dest + width * height / 4;
+ for (i = 0; i < height; i += 2) {
+ for (j = 0; j < width; j += 2) {
+ *dest++ = ((int) src[2] + src1[2]) / 2; /* U */
+ *vdest++ = ((int) *src + *src1) / 2; /* V */
+ src += 4;
+ src1 += 4;
+ }
+ src = src1;
+ src1 += width * 2;
+ }
+}
+
void v4lconvert_swap_rgb(const unsigned char *src, unsigned char *dst,
int width, int height)
{
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2008-09-01 8:04 [PATCH] v4l library YVYU decoding Jean-Francois Moine
2008-09-03 12:46 ` Hans de Goede
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