SDR I/Q data conversion from signed 8-bit to [-1 to +1] float.
Signed-off-by: Antti Palosaari <crope@xxxxxx>
---
contrib/freebsd/include/linux/videodev2.h | 1 +
include/linux/videodev2.h | 1 +
lib/libv4lconvert/libv4lconvert.c | 12 ++++++++++++
3 files changed, 14 insertions(+)
diff --git a/contrib/freebsd/include/linux/videodev2.h b/contrib/freebsd/include/linux/videodev2.h
index 05cc19b..d433a45 100644
--- a/contrib/freebsd/include/linux/videodev2.h
+++ b/contrib/freebsd/include/linux/videodev2.h
@@ -468,6 +468,7 @@ struct v4l2_pix_format {
/* SDR */
#define V4L2_PIX_FMT_SDR_FLOAT v4l2_fourcc('D', 'F', '3', '2') /* float 32-bit */
#define V4L2_PIX_FMT_SDR_U8 v4l2_fourcc('D', 'U', '0', '8') /* unsigned 8-bit */
+#define V4L2_PIX_FMT_SDR_S8 v4l2_fourcc('D', 'S', '0', '8') /* signed 8-bit */
/*
* F O R M A T E N U M E R A T I O N
diff --git a/include/linux/videodev2.h b/include/linux/videodev2.h
index ba2a173..35b5731 100644
--- a/include/linux/videodev2.h
+++ b/include/linux/videodev2.h
@@ -434,6 +434,7 @@ struct v4l2_pix_format {
/* SDR */
#define V4L2_PIX_FMT_SDR_FLOAT v4l2_fourcc('D', 'F', '3', '2') /* float 32-bit */
#define V4L2_PIX_FMT_SDR_U8 v4l2_fourcc('D', 'U', '0', '8') /* unsigned 8-bit */
+#define V4L2_PIX_FMT_SDR_S8 v4l2_fourcc('D', 'S', '0', '8') /* signed 8-bit */
/*
* F O R M A T E N U M E R A T I O N
diff --git a/lib/libv4lconvert/libv4lconvert.c b/lib/libv4lconvert/libv4lconvert.c
index b7cc0e1..421a8f1 100644
--- a/lib/libv4lconvert/libv4lconvert.c
+++ b/lib/libv4lconvert/libv4lconvert.c
@@ -447,6 +447,7 @@ static int v4lconvert_do_try_format_sdr(struct v4lconvert_data *data,
static const unsigned int supported_src_pixfmts_sdr[] = {
V4L2_PIX_FMT_SDR_FLOAT,
V4L2_PIX_FMT_SDR_U8,
+ V4L2_PIX_FMT_SDR_S8,
};
for (i = 0; i < ARRAY_SIZE(supported_src_pixfmts_sdr); i++) {
@@ -1334,6 +1335,7 @@ static int v4lconvert_convert_sdr(struct v4lconvert_data *data,
int i, dest_needed;
unsigned int src_pix_fmt = fmt->fmt.pix.pixelformat;
float *fptr = (float *) dest;
+ int8_t *s8ptr;
switch (src_pix_fmt) {
case V4L2_PIX_FMT_SDR_U8:
@@ -1345,6 +1347,16 @@ static int v4lconvert_convert_sdr(struct v4lconvert_data *data,
for (i = 0; i < src_size; i++)
*fptr++ = (*src++ - 127.5f) / 127.5f;
break;
+ case V4L2_PIX_FMT_SDR_S8:
+ s8ptr = (int8_t *) src;
+ /* 8-bit signed to 32-bit float */
+ dest_needed = src_size * sizeof(float);
+ if (dest_size < dest_needed)
+ goto err_buf_too_small;
+
+ for (i = 0; i < src_size; i++)
+ *fptr++ = (*s8ptr++ + 0.5f) / 127.5f;
+ break;
default:
V4LCONVERT_ERR("Unknown src format in conversion\n");
errno = EINVAL;
--
1.8.4.2
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