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v4l2: Add support for querying capabilities

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This adds a helper function to query v4l2 capabilities, returning
either the device caps when available or the general device caps
otherwise.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
This commit is contained in:
Paul Kocialkowski
2018-08-06 16:38:48 +02:00
parent 7d1ac10517
commit 57999e3883
2 changed files with 22 additions and 0 deletions
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src/v4l2.c
+21
View File
@@ -32,6 +32,27 @@
#include "utils.h"
#include "v4l2.h"
int v4l2_query_capabilities(int video_fd, unsigned int *capabilities)
{
struct v4l2_capability capability;
int rc;
memset(&capability, 0, sizeof(capability));
rc = ioctl(video_fd, VIDIOC_QUERYCAP, &capability);
if (rc < 0)
return -1;
if (capabilities != NULL) {
if ((capability.capabilities & V4L2_CAP_DEVICE_CAPS) != 0)
*capabilities = capability.device_caps;
else
*capabilities = capability.capabilities;
}
return 0;
}
bool v4l2_find_format(int video_fd, unsigned int type, unsigned int pixelformat)
{
struct v4l2_fmtdesc fmtdesc;
src/v4l2.h
+1
View File
@@ -29,6 +29,7 @@
#define SOURCE_SIZE_MAX (1024 * 1024)
int v4l2_query_capabilities(int video_fd, unsigned int *capabilities);
bool v4l2_find_format(int video_fd, unsigned int type,
unsigned int pixelformat);
int v4l2_set_format(int video_fd, unsigned int type, unsigned int pixelformat,