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From 2e483da277c5d1f595a966a43b06d94c2054dee0 Mon Sep 17 00:00:00 2001
From: Don Darling <ddarling@ti.com>
Date: Tue, 12 Oct 2010 15:45:55 -0500
Subject: [PATCH 10/17] v4l2src: set bytesperline and sizeimage before calling the VIDIOC_S_FMT ioctl
The V4L2 capture driver expects the application to set these fields prior
to calling VIDIOC_TRY_FMT or VIDIOC_S_FMT:
fmt.fmt.pix.bytesperline
fmt.fmt.pix.sizeimage
An inquiry has been sent to explain why this is needed, as other V4L2 catpure
drivers tend to provide this information, rather than expecting applications
to provide it.
---
sys/v4l2/gstv4l2object.c | 23 +++++++++++++++++++++++
1 files changed, 23 insertions(+), 0 deletions(-)
diff --git a/sys/v4l2/gstv4l2object.c b/sys/v4l2/gstv4l2object.c
index b03c86e..2d79b0b 100644
--- a/sys/v4l2/gstv4l2object.c
+++ b/sys/v4l2/gstv4l2object.c
@@ -1902,6 +1902,17 @@ gst_v4l2_object_get_nearest_size (GstV4l2Object * v4l2object,
}
}
+#if defined(V4L2_PIX_FMT_NV16)
+ /* Set the bytesperline and sizeimage fields when using the NV16 colorspace.
+ * Some drivers, such as the DM6467T component capture driver expects these
+ * fields to be set.
+ */
+ if (pixelformat == V4L2_PIX_FMT_NV16) {
+ fmt.fmt.pix.bytesperline = (*width);
+ fmt.fmt.pix.sizeimage = (fmt.fmt.pix.bytesperline * (*height)) << 1;
+ }
+#endif
+
r = v4l2_ioctl (fd, VIDIOC_TRY_FMT, &fmt);
if (r < 0 && (errno == EINVAL || errno == EPERM)) {
/* try again with progressive video */
@@ -2029,6 +2040,18 @@ gst_v4l2_object_set_format (GstV4l2Object * v4l2object, guint32 pixelformat,
v4l2object->bytesused = format.fmt.pix.sizeimage;
#endif
+ /* Set the bytesperline and sizeimage fields when using the NV16 colorspace.
+ * Some drivers, such as the DM6467T component capture driver expects these
+ * fields to be set.
+ */
+ #if defined(V4L2_PIX_FMT_NV16)
+ if (pixelformat == V4L2_PIX_FMT_NV16) {
+ format.fmt.pix.bytesperline = width;
+ format.fmt.pix.sizeimage =
+ (format.fmt.pix.bytesperline * height) << 1;
+ }
+ #endif
+
if (v4l2_ioctl (fd, VIDIOC_S_FMT, &format) < 0) {
/* we might also get EBUSY here */
if (errno != EINVAL && errno != EPERM)
--
1.7.1
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