Hi,
First of all my apologies for taking so long to get around to
reviewing this.
Over all it looks good, I've put some small remarks inline, if
you fix these I can merge this. I wonder though, given the recent
limbo around Nokia's change of focus, if there are any plans to
actually move forward with a plugin using this... ?
The reason I'm asking is that adding the plugin framework if nothing
is going to use it seems a bit senseless.
Regards,
Hans
On 02/14/2011 12:02 PM, Yordan Kamenov wrote:
A libv4l2 plugin will sit in between libv4l2 itself and the actual
/dev/video device node a fd refers to. It will be called each time
libv4l2 wants to do an operation (read/write/ioctl) on the actual
/dev/video node in question.
Signed-off-by: Yordan Kamenov<[email protected]>
---
lib/include/libv4l2-plugin.h | 36 ++++++
lib/include/libv4lconvert.h | 5 +-
lib/libv4l2/Makefile | 4 +-
lib/libv4l2/libv4l2-priv.h | 10 ++
lib/libv4l2/libv4l2.c | 90 ++++++++++----
lib/libv4l2/v4l2-plugin.c | 160 ++++++++++++++++++++++++
lib/libv4l2/v4l2convert.c | 9 --
lib/libv4lconvert/control/libv4lcontrol-priv.h | 4 +
lib/libv4lconvert/control/libv4lcontrol.c | 35 ++++--
lib/libv4lconvert/control/libv4lcontrol.h | 5 +-
lib/libv4lconvert/libv4lconvert-priv.h | 2 +
lib/libv4lconvert/libv4lconvert.c | 34 ++++--
12 files changed, 333 insertions(+), 61 deletions(-)
create mode 100644 lib/include/libv4l2-plugin.h
create mode 100644 lib/libv4l2/v4l2-plugin.c
diff --git a/lib/include/libv4l2-plugin.h b/lib/include/libv4l2-plugin.h
new file mode 100644
index 0000000..5cb666a
--- /dev/null
+++ b/lib/include/libv4l2-plugin.h
@@ -0,0 +1,36 @@
+/*
+* Copyright (C) 2010 Nokia Corporation<[email protected]>
+
+* 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
+* the Free Software Foundation; either version 2.1 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#ifndef __LIBV4L2_PLUGIN_H
+#define __LIBV4L2_PLUGIN_H
+
+#include<sys/types.h>
+
+/* Structure libv4l2_dev_ops holds the calls from libv4ls to video nodes.
+ They can be normal open/close/ioctl etc. or any of them may be replaced
+ with a callback by a loaded plugin.
+*/
+
+struct libv4l2_dev_ops {
+ void * (*init)(int fd);
+ int (*close)(void *dev_ops_priv);
Since you don't error check the close callback's return value in the
single place you call it, you might just as well make it void
+ int (*ioctl)(void *dev_ops_priv, int fd, unsigned long int request, void
*arg);
+ ssize_t (*read)(void *dev_ops_priv, int fd, void *buffer, size_t n);
+};
+
+#endif
diff --git a/lib/include/libv4lconvert.h b/lib/include/libv4lconvert.h
index 0264290..351142e 100644
--- a/lib/include/libv4lconvert.h
+++ b/lib/include/libv4lconvert.h
@@ -38,6 +38,8 @@
#include<linux/videodev2.h>
+#include "libv4l2-plugin.h"
+
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
@@ -50,7 +52,8 @@ extern "C" {
struct v4lconvert_data;
-LIBV4L_PUBLIC struct v4lconvert_data *v4lconvert_create(int fd);
+LIBV4L_PUBLIC struct v4lconvert_data *v4lconvert_create(int fd,
+ void *dev_ops_priv, struct libv4l2_dev_ops *dev_ops);
LIBV4L_PUBLIC void v4lconvert_destroy(struct v4lconvert_data *data);
/* When doing flipping / rotating / video-processing, only supported
diff --git a/lib/libv4l2/Makefile b/lib/libv4l2/Makefile
index d78632f..eb1c019 100644
--- a/lib/libv4l2/Makefile
+++ b/lib/libv4l2/Makefile
@@ -1,8 +1,8 @@
override CPPFLAGS += -I../include -fvisibility=hidden
-LIBS_libv4l2 = -lpthread
+LIBS_libv4l2 = -lpthread -ldl
-V4L2_OBJS = libv4l2.o log.o
+V4L2_OBJS = libv4l2.o v4l2-plugin.o log.o
V4L2CONVERT = v4l2convert.so
V4L2CONVERT_O = v4l2convert.o libv4l2.so
TARGETS = $(V4L2_LIB) libv4l2.pc
diff --git a/lib/libv4l2/libv4l2-priv.h b/lib/libv4l2/libv4l2-priv.h
index 46d6103..d06a508 100644
--- a/lib/libv4l2/libv4l2-priv.h
+++ b/lib/libv4l2/libv4l2-priv.h
@@ -85,8 +85,18 @@ struct v4l2_dev_info {
/* buffer when doing conversion and using read() for read() */
int readbuf_size;
unsigned char *readbuf;
+ struct libv4l2_dev_ops *dev_ops;
+ /* plugin info */
+ void *plugin_library;
+ void *dev_ops_priv;
};
+void v4l2_plugin_init(int fd, void **plugin_lib_ret, void **plugin_priv_ret,
+ struct libv4l2_dev_ops **dev_ops_ret);
+void v4l2_plugin_cleanup(void *plugin_priv, void *plugin_lib,
+ struct libv4l2_dev_ops *dev_ops);
+
+
/* From log.c */
void v4l2_log_ioctl(unsigned long int request, void *arg, int result);
diff --git a/lib/libv4l2/libv4l2.c b/lib/libv4l2/libv4l2.c
index ab85ea7..2b717a8 100644
--- a/lib/libv4l2/libv4l2.c
+++ b/lib/libv4l2/libv4l2.c
@@ -67,6 +67,7 @@
#include<sys/stat.h>
#include "libv4l2.h"
#include "libv4l2-priv.h"
+#include "libv4l2-plugin.h"
/* Note these flags are stored together with the flags passed to
v4l2_fd_open()
in v4l2_dev_info's flags member, so care should be taken that the do not
@@ -102,7 +103,8 @@ static int v4l2_request_read_buffers(int index)
devices[index].nreadbuffers;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_REQBUFS,&req);
+ result = devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_REQBUFS,&req);
if (result< 0) {
int saved_err = errno;
@@ -131,7 +133,8 @@ static void v4l2_unrequest_read_buffers(int index)
req.count = 0;
req.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
req.memory = V4L2_MEMORY_MMAP;
- if (SYS_IOCTL(devices[index].fd, VIDIOC_REQBUFS,&req)< 0)
+ if (devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_REQBUFS,&req)< 0)
return;
devices[index].no_frames = MIN(req.count, V4L2_MAX_NO_FRAMES);
@@ -152,7 +155,8 @@ static int v4l2_map_buffers(int index)
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_QUERYBUF,&buf);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_QUERYBUF,&buf);
if (result) {
int saved_err = errno;
@@ -202,7 +206,8 @@ static int v4l2_streamon(int index)
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (!(devices[index].flags& V4L2_STREAMON)) {
- result = SYS_IOCTL(devices[index].fd, VIDIOC_STREAMON,&type);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_STREAMON,&type);
if (result) {
int saved_err = errno;
@@ -223,7 +228,8 @@ static int v4l2_streamoff(int index)
enum v4l2_buf_type type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
if (devices[index].flags& V4L2_STREAMON) {
- result = SYS_IOCTL(devices[index].fd, VIDIOC_STREAMOFF,&type);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_STREAMOFF,&type);
if (result) {
int saved_err = errno;
@@ -252,7 +258,8 @@ static int v4l2_queue_read_buffer(int index, int
buffer_index)
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = buffer_index;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_QBUF,&buf);
+ result = devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_QBUF,&buf);
if (result) {
int saved_err = errno;
@@ -277,7 +284,8 @@ static int v4l2_dequeue_and_convert(int index, struct
v4l2_buffer *buf,
return result;
do {
- result = SYS_IOCTL(devices[index].fd, VIDIOC_DQBUF, buf);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_DQBUF, buf);
if (result) {
if (errno != EAGAIN) {
int saved_err = errno;
@@ -356,7 +364,8 @@ static int v4l2_read_and_convert(int index, unsigned char
*dest, int dest_size)
}
do {
- result = SYS_READ(devices[index].fd, devices[index].readbuf,
buf_size);
+ result =
devices[index].dev_ops->read(devices[index].dev_ops_priv,
+ devices[index].fd, devices[index].readbuf,
buf_size);
if (result<= 0) {
if (result&& errno != EAGAIN) {
int saved_err = errno;
@@ -496,7 +505,8 @@ static int v4l2_buffers_mapped(int index)
buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
buf.memory = V4L2_MEMORY_MMAP;
buf.index = i;
- if (SYS_IOCTL(devices[index].fd, VIDIOC_QUERYBUF,&buf))
{
+ if
(devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd,
VIDIOC_QUERYBUF,&buf)) {
int saved_err = errno;
V4L2_LOG_ERR("querying buffer %u: %s\n", i,
strerror(errno));
@@ -561,6 +571,11 @@ int v4l2_fd_open(int fd, int v4l2_flags)
struct v4l2_capability cap;
struct v4l2_format fmt;
struct v4lconvert_data *convert;
+ struct libv4l2_dev_ops *dev_ops;
+ void *plugin_library;
+ void *plugin_data;
+
+ v4l2_plugin_init(fd,&plugin_library,&plugin_data,&dev_ops);
/* If no log file was set by the app, see if one was specified through
the
environment */
@@ -571,9 +586,10 @@ int v4l2_fd_open(int fd, int v4l2_flags)
}
/* check that this is an v4l2 device */
- if (SYS_IOCTL(fd, VIDIOC_QUERYCAP,&cap)) {
+ if (dev_ops->ioctl(plugin_data, fd, VIDIOC_QUERYCAP,&cap)) {
int saved_err = errno;
+ v4l2_plugin_cleanup(plugin_data, plugin_library, dev_ops);
V4L2_LOG_ERR("getting capabilities: %s\n", strerror(errno));
errno = saved_err;
return -1;
@@ -581,29 +597,38 @@ int v4l2_fd_open(int fd, int v4l2_flags)
/* we only add functionality for video capture devices */
if (!(cap.capabilities& V4L2_CAP_VIDEO_CAPTURE) ||
- !(cap.capabilities& (V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE)))
+ !(cap.capabilities& (V4L2_CAP_STREAMING |
V4L2_CAP_READWRITE))) {
+ v4l2_plugin_cleanup(plugin_data, plugin_library, dev_ops);
return fd;
+ }
/* Get current cam format */
fmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
- if (SYS_IOCTL(fd, VIDIOC_G_FMT,&fmt)) {
+ if (dev_ops->ioctl(plugin_data, fd, VIDIOC_G_FMT,&fmt)) {
int saved_err = errno;
+ v4l2_plugin_cleanup(plugin_data, plugin_library, dev_ops);
V4L2_LOG_ERR("getting pixformat: %s\n", strerror(errno));
errno = saved_err;
return -1;
}
/* init libv4lconvert */
- convert = v4lconvert_create(fd);
- if (!convert)
+ convert = v4lconvert_create(fd, plugin_data, dev_ops);
+ if (!convert) {
+ v4l2_plugin_cleanup(plugin_data, plugin_library, dev_ops);
return -1;
+ }
/* So we have a v4l2 capture device, register it in our devices array */
pthread_mutex_lock(&v4l2_open_mutex);
for (index = 0; index< V4L2_MAX_DEVICES; index++)
if (devices[index].fd == -1) {
devices[index].fd = fd;
+
+ devices[index].plugin_library = plugin_library;
+ devices[index].dev_ops_priv = plugin_data;
+ devices[index].dev_ops = dev_ops;
break;
}
pthread_mutex_unlock(&v4l2_open_mutex);
@@ -611,6 +636,7 @@ int v4l2_fd_open(int fd, int v4l2_flags)
if (index == V4L2_MAX_DEVICES) {
V4L2_LOG_ERR("attempting to open more then %d video devices\n",
V4L2_MAX_DEVICES);
+ v4l2_plugin_cleanup(plugin_data, plugin_library, dev_ops);
errno = EBUSY;
return -1;
}
@@ -690,6 +716,9 @@ int v4l2_close(int fd)
if (index == -1)
return SYS_CLOSE(fd);
+ v4l2_plugin_cleanup(devices[index].dev_ops_priv,
+ devices[index].plugin_library, devices[index].dev_ops);
+
This should be moved lower, to were the actual fd gets closed, if the fd
was opened multiple times (through dup) the plugin stuff should not
be cleaned up yet...
/* Abuse stream_lock to stop 2 closes from racing and trying to free the
resources twice */
pthread_mutex_lock(&devices[index].stream_lock);
@@ -808,6 +837,7 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
va_list ap;
int result, index, saved_err;
int is_capture_request = 0, stream_needs_locking = 0;
+ void *plugin_data;
va_start(ap, request);
arg = va_arg(ap, void *);
@@ -817,6 +847,7 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
if (index == -1)
return SYS_IOCTL(fd, request, arg);
+ plugin_data = devices[index].dev_ops_priv;
/* Appearantly the kernel and / or glibc ignore the 32 most significant
bits
when long = 64 bits, and some applications pass an int holding the
req to
ioctl, causing it to get sign extended, depending upon this behavior
*/
You don't seem to use plugin_data consistently in the function, see below.
@@ -879,7 +910,7 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
}
if (!is_capture_request) {
- result = SYS_IOCTL(fd, request, arg);
+ result = devices[index].dev_ops->ioctl(plugin_data, fd,
request, arg);
saved_err = errno;
v4l2_log_ioctl(request, arg, result);
errno = saved_err;
This is the 1 of places where you actually use plugin_data, either use it
everywhere,
or drop it.
@@ -927,7 +958,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
case VIDIOC_QUERYCAP: {
struct v4l2_capability *cap = arg;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_QUERYCAP, cap);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_QUERYCAP, cap);
if (result == 0)
/* We always support read() as we fake it using mmap
mode */
cap->capabilities |= V4L2_CAP_READWRITE;
@@ -977,8 +1009,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
}
if (devices[index].flags& V4L2_DISABLE_CONVERSION) {
- result = SYS_IOCTL(devices[index].fd, VIDIOC_TRY_FMT,
- dest_fmt);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_TRY_FMT,
dest_fmt);
src_fmt = *dest_fmt;
} else {
result = v4lconvert_try_format(devices[index].convert,
dest_fmt,
@@ -1018,7 +1050,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
break;
req_pix_fmt = src_fmt.fmt.pix;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_S_FMT,&src_fmt);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_S_FMT,&src_fmt);
if (result) {
saved_err = errno;
V4L2_LOG_ERR("setting pixformat: %s\n",
strerror(errno));
@@ -1067,7 +1100,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
if (req->count> V4L2_MAX_NO_FRAMES)
req->count = V4L2_MAX_NO_FRAMES;
- result = SYS_IOCTL(devices[index].fd, VIDIOC_REQBUFS, req);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_REQBUFS, req);
if (result< 0)
break;
result = 0; /* some drivers return the number of buffers on
success */
@@ -1088,7 +1122,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
/* Do a real query even when converting to let the driver fill
in
things like buf->field */
- result = SYS_IOCTL(devices[index].fd, VIDIOC_QUERYBUF, buf);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_QUERYBUF, buf);
if (result || !v4l2_needs_conversion(index))
break;
@@ -1115,7 +1150,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
break;
}
- result = SYS_IOCTL(devices[index].fd, VIDIOC_QBUF, arg);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_QBUF, arg);
break;
case VIDIOC_DQBUF: {
@@ -1128,7 +1164,8 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
}
if (!v4l2_needs_conversion(index)) {
- result = SYS_IOCTL(devices[index].fd, VIDIOC_DQBUF,
buf);
+ result =
devices[index].dev_ops->ioctl(devices[index].dev_ops_priv,
+ devices[index].fd, VIDIOC_DQBUF, buf);
if (result) {
int saved_err = errno;
@@ -1187,7 +1224,7 @@ int v4l2_ioctl(int fd, unsigned long int request, ...)
break;
default:
- result = SYS_IOCTL(fd, request, arg);
+ result = devices[index].dev_ops->ioctl(plugin_data, fd,
request, arg);
break;
}
This is the only other place you use plugin_data.
@@ -1206,18 +1243,21 @@ ssize_t v4l2_read(int fd, void *dest, size_t n)
{
ssize_t result;
int saved_errno;
+ void *plugin_data;
int index = v4l2_get_index(fd);
if (index == -1)
return SYS_READ(fd, dest, n);
+ plugin_data = devices[index].dev_ops_priv;
+
pthread_mutex_lock(&devices[index].stream_lock);
/* When not converting and the device supports read let the kernel
handle
it */
if ((devices[index].flags& V4L2_SUPPORTS_READ)&&
!v4l2_needs_conversion(index)) {
- result = SYS_READ(fd, dest, n);
+ result = devices[index].dev_ops->read(plugin_data, fd, dest, n);
goto leave;
}
I so no need for the plugin_data variable here, just use
devices[index].dev_ops_priv directly when you call dev_ops->read.
diff --git a/lib/libv4l2/v4l2-plugin.c b/lib/libv4l2/v4l2-plugin.c
new file mode 100644
index 0000000..89bffc5
--- /dev/null
+++ b/lib/libv4l2/v4l2-plugin.c
@@ -0,0 +1,160 @@
+/*
+* Copyright (C) 2010 Nokia Corporation<[email protected]>
+
+* 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
+* the Free Software Foundation; either version 2.1 of the License, or
+* (at your option) any later version.
+*
+* This program is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+* Lesser General Public License for more details.
+*
+* You should have received a copy of the GNU Lesser General Public License
+* along with this program; if not, write to the Free Software
+* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+*/
+
+#include<stdarg.h>
+#include<dlfcn.h>
+#include<fcntl.h>
+#include<glob.h>
+#include<sys/stat.h>
+#include<sys/mman.h>
+#include "libv4l2.h"
+#include "libv4l2-priv.h"
+#include "libv4l2-plugin.h"
+
+/* libv4l plugin support:
+ it is provided by functions v4l2_plugin_[open,close,etc].
+
+ When open() is called libv4l dlopens files in /usr/lib[64]/libv4l/plugins
+ 1 at a time and call open callback passing through the applications
+ parameters unmodified.
+
+ If a plugin is relevant for the specified device node, it can indicate so
+ by returning a value other then -1 (the actual file descriptor).
+ As soon as a plugin returns another value then -1 plugin loading stops and
+ information about it (fd and corresponding library handle) is stored. For
+ each function v4l2_[ioctl,read,close,etc] is called corresponding
+ v4l2_plugin_* function which looks if there is loaded plugin for that file
+ and call it's callbacks.
+
+ v4l2_plugin_* function indicates by it's first argument if plugin was used,
+ and if it was not then v4l2_* functions proceed with their usual behavior.
+*/
+
+#define PLUGINS_PATTERN "/usr/lib/libv4l/plugins/*.so"
+
+static void * dev_init(int fd)
+{
+ return NULL;
+}
+
+static int dev_close(void *dev_ops_priv)
+{
+ return -1;
+}
+
-1 is an error? Why would the default plugin always return error on close?
Anyways as said before just make it void.
+static int dev_ioctl(void *dev_ops_priv, int fd, unsigned long cmd, void *arg)
+{
+ return syscall(SYS_ioctl, (int)(fd), (unsigned long)(cmd),
+ (void *)(arg));
+}
+
+static ssize_t dev_read(void *dev_ops_priv, int fd, void *buf, size_t len)
+{
+ return syscall(SYS_read, (int)(fd), (void *)(buf), (size_t)(len));
+}
Please use the SYS_IOCTL and SYS_READ macro's here for compat with freebsd.
+
+
+struct libv4l2_dev_ops default_operations = {
+ .init =&dev_init,
+ .close =&dev_close,
+ .ioctl =&dev_ioctl,
+ .read =&dev_read
+};
+
+void v4l2_plugin_init(int fd, void **plugin_lib_ret, void **plugin_priv_ret,
+ struct libv4l2_dev_ops **dev_ops_ret)
+{
+ char *error;
+ int glob_ret, plugin_num;
+ void *plugin_library = NULL;
+ struct libv4l2_dev_ops *libv4l2_plugin = NULL;
+ glob_t globbuf;
+
+ *dev_ops_ret =&default_operations;
+
+ glob_ret = glob(PLUGINS_PATTERN, 0, NULL,&globbuf);
+
+ if (glob_ret == GLOB_NOSPACE) {
+ *plugin_lib_ret = NULL;
+ *plugin_priv_ret = NULL;
+ return;
+ }
+
+ if (glob_ret == GLOB_ABORTED || glob_ret == GLOB_NOMATCH) {
+ *plugin_lib_ret = NULL;
+ *plugin_priv_ret = NULL;
+ goto leave;
+ }
+
+ for (plugin_num = 0; plugin_num< globbuf.gl_pathc; plugin_num++) {
+
+ V4L2_LOG("PLUGIN: dlopen(%s);\n", globbuf.gl_pathv[plugin_num]);
+
+ plugin_library = dlopen(globbuf.gl_pathv[plugin_num],
+ RTLD_LAZY);
+
+ if (!plugin_library)
+ continue;
+
+ dlerror(); /* Clear any existing error */
+ libv4l2_plugin = (struct libv4l2_dev_ops *)
+ dlsym(plugin_library, "libv4l2_plugin");
+
+ error = dlerror();
+ if (error != NULL) {
+ V4L2_LOG_ERR("PLUGIN: dlsym failed: %s\n", error);
+ dlclose(plugin_library);
+
+ continue;
+ }
+
+ *plugin_priv_ret = NULL;
+ if (libv4l2_plugin->init)
+ *plugin_priv_ret = libv4l2_plugin->init(fd);
+
+ if (!*plugin_priv_ret) {
+ V4L2_LOG("PLUGIN: plugin open() returned NULL\n");
+ dlclose(plugin_library);
+ *plugin_lib_ret = NULL;
+ continue;
+ }
+
+ (*dev_ops_ret)->init = libv4l2_plugin->init;
+ if (libv4l2_plugin->close != NULL)
+ (*dev_ops_ret)->close = libv4l2_plugin->close;
+ if (libv4l2_plugin->ioctl != NULL)
+ (*dev_ops_ret)->ioctl = libv4l2_plugin->ioctl;
+ if (libv4l2_plugin->read != NULL)
+ (*dev_ops_ret)->read = libv4l2_plugin->read;
+
+ break;
+
+ }
+
+leave:
+ globfree(&globbuf);
+}
+
+void v4l2_plugin_cleanup(void *plugin_priv, void *plugin_lib,
+ struct libv4l2_dev_ops *dev_ops)
+{
+ if (plugin_priv) {
+ dev_ops->close(plugin_priv);
+ dlclose(plugin_lib);
+ }
+}
diff --git a/lib/libv4l2/v4l2convert.c b/lib/libv4l2/v4l2convert.c
index e251085..03f34ad 100644
--- a/lib/libv4l2/v4l2convert.c
+++ b/lib/libv4l2/v4l2convert.c
@@ -46,7 +46,6 @@
LIBV4L_PUBLIC int open(const char *file, int oflag, ...)
{
int fd;
- struct v4l2_capability cap;
int v4l_device = 0;
/* check if we're opening a video4linux2 device */
@@ -76,14 +75,6 @@ LIBV4L_PUBLIC int open(const char *file, int oflag, ...)
if (fd == -1 || !v4l_device)
return fd;
- /* check that this is an v4l2 device, libv4l2 only supports v4l2
devices */
- if (SYS_IOCTL(fd, VIDIOC_QUERYCAP,&cap))
- return fd;
-
- /* libv4l2 only adds functionality to capture capable devices */
- if (!(cap.capabilities& V4L2_CAP_VIDEO_CAPTURE))
- return fd;
-
/* Try to Register with libv4l2 (in case of failure pass the fd to the
application as is) */
v4l2_fd_open(fd, 0);
Hmm, why are you removing this check ?
diff --git a/lib/libv4lconvert/control/libv4lcontrol-priv.h
b/lib/libv4lconvert/control/libv4lcontrol-priv.h
index 22cdf34..1259e6b 100644
--- a/lib/libv4lconvert/control/libv4lcontrol-priv.h
+++ b/lib/libv4lconvert/control/libv4lcontrol-priv.h
@@ -22,6 +22,8 @@
#ifndef __LIBV4LCONTROL_PRIV_H
#define __LIBV4LCONTROL_PRIV_H
+#include "libv4l2-plugin.h"
+
#define V4LCONTROL_SHM_SIZE 4096
#define V4LCONTROL_SUPPORTS_NEXT_CTRL 0x01
@@ -37,6 +39,8 @@ struct v4lcontrol_data {
unsigned int *shm_values; /* shared memory control value store */
unsigned int old_values[V4LCONTROL_COUNT]; /* for controls_changed() */
const struct v4lcontrol_flags_info *flags_info;
+ struct libv4l2_dev_ops *dev_ops;
+ void *dev_ops_priv;
};
struct v4lcontrol_flags_info {
diff --git a/lib/libv4lconvert/control/libv4lcontrol.c
b/lib/libv4lconvert/control/libv4lcontrol.c
index 6a09d38..2ef642c 100644
--- a/lib/libv4lconvert/control/libv4lcontrol.c
+++ b/lib/libv4lconvert/control/libv4lcontrol.c
@@ -701,7 +701,8 @@ static void v4lcontrol_get_flags_from_db(struct
v4lcontrol_data *data,
}
}
-struct v4lcontrol_data *v4lcontrol_create(int fd, int always_needs_conversion)
+struct v4lcontrol_data *v4lcontrol_create(int fd, void *dev_ops_priv,
+ struct libv4l2_dev_ops *dev_ops, int always_needs_conversion)
{
int shm_fd;
int i, rc, got_usb_ids, init = 0;
@@ -721,10 +722,12 @@ struct v4lcontrol_data *v4lcontrol_create(int fd, int
always_needs_conversion)
}
data->fd = fd;
+ data->dev_ops = dev_ops;
+ data->dev_ops_priv = dev_ops_priv;
/* Check if the driver has indicated some form of flipping is needed */
- if ((SYS_IOCTL(data->fd, VIDIOC_G_INPUT,&input.index) == 0)&&
- (SYS_IOCTL(data->fd, VIDIOC_ENUMINPUT,&input) == 0)) {
+ if ((data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
VIDIOC_G_INPUT,&input.index) == 0)&&
+ (data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
VIDIOC_ENUMINPUT,&input) == 0)) {
if (input.status& V4L2_IN_ST_HFLIP)
data->flags |= V4LCONTROL_HFLIPPED;
if (input.status& V4L2_IN_ST_VFLIP)
@@ -741,7 +744,8 @@ struct v4lcontrol_data *v4lcontrol_create(int fd, int
always_needs_conversion)
data->flags = strtol(s, NULL, 0);
ctrl.id = V4L2_CTRL_FLAG_NEXT_CTRL;
- if (SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL,&ctrl) == 0)
+ if (data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL,&ctrl) == 0)
data->priv_flags |= V4LCONTROL_SUPPORTS_NEXT_CTRL;
/* If the device always needs conversion, we can add fake controls at
no cost
@@ -749,7 +753,8 @@ struct v4lcontrol_data *v4lcontrol_create(int fd, int
always_needs_conversion)
if (always_needs_conversion || v4lcontrol_needs_conversion(data)) {
for (i = 0; i< V4LCONTROL_AUTO_ENABLE_COUNT; i++) {
ctrl.id = fake_controls[i].id;
- rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL,&ctrl);
+ rc = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL,&ctrl);
if (rc == -1 || (rc == 0&& (ctrl.flags&
V4L2_CTRL_FLAG_DISABLED)))
data->controls |= 1<< i;
}
@@ -761,17 +766,20 @@ struct v4lcontrol_data *v4lcontrol_create(int fd, int
always_needs_conversion)
different sensors with / without autogain or the necessary controls.
*/
while (data->flags& V4LCONTROL_WANTS_AUTOGAIN) {
ctrl.id = V4L2_CID_AUTOGAIN;
- rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL,&ctrl);
+ rc = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL,&ctrl);
if (rc == 0&& !(ctrl.flags& V4L2_CTRL_FLAG_DISABLED))
break;
ctrl.id = V4L2_CID_EXPOSURE;
- rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL,&ctrl);
+ rc = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL,&ctrl);
if (rc != 0 || (ctrl.flags& V4L2_CTRL_FLAG_DISABLED))
break;
ctrl.id = V4L2_CID_GAIN;
- rc = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL,&ctrl);
+ rc = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL,&ctrl);
if (rc != 0 || (ctrl.flags& V4L2_CTRL_FLAG_DISABLED))
break;
@@ -788,7 +796,7 @@ struct v4lcontrol_data *v4lcontrol_create(int fd, int
always_needs_conversion)
if (data->controls == 0)
return data; /* No need to create a shared memory segment */
- if (SYS_IOCTL(fd, VIDIOC_QUERYCAP,&cap)) {
+ if (data->dev_ops->ioctl(data->dev_ops_priv, fd, VIDIOC_QUERYCAP,&cap))
{
perror("libv4lcontrol: error querying device capabilities");
goto error;
}
@@ -974,7 +982,8 @@ int v4lcontrol_vidioc_queryctrl(struct v4lcontrol_data
*data, void *arg)
}
/* find out what the kernel driver would respond. */
- retval = SYS_IOCTL(data->fd, VIDIOC_QUERYCTRL, arg);
+ retval = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_QUERYCTRL, arg);
if ((data->priv_flags& V4LCONTROL_SUPPORTS_NEXT_CTRL)&&
(orig_id& V4L2_CTRL_FLAG_NEXT_CTRL)) {
@@ -1011,7 +1020,8 @@ int v4lcontrol_vidioc_g_ctrl(struct v4lcontrol_data
*data, void *arg)
return 0;
}
- return SYS_IOCTL(data->fd, VIDIOC_G_CTRL, arg);
+ return data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_G_CTRL, arg);
}
int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data *data, void *arg)
@@ -1032,7 +1042,8 @@ int v4lcontrol_vidioc_s_ctrl(struct v4lcontrol_data
*data, void *arg)
return 0;
}
- return SYS_IOCTL(data->fd, VIDIOC_S_CTRL, arg);
+ return data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_S_CTRL, arg);
}
int v4lcontrol_get_flags(struct v4lcontrol_data *data)
diff --git a/lib/libv4lconvert/control/libv4lcontrol.h
b/lib/libv4lconvert/control/libv4lcontrol.h
index 974e97a..1c09546 100644
--- a/lib/libv4lconvert/control/libv4lcontrol.h
+++ b/lib/libv4lconvert/control/libv4lcontrol.h
@@ -22,6 +22,8 @@
#ifndef __LIBV4LCONTROL_H
#define __LIBV4LCONTROL_H
+#include "libv4l2-plugin.h"
+
/* Flags */
#define V4LCONTROL_HFLIPPED 0x01
#define V4LCONTROL_VFLIPPED 0x02
@@ -47,7 +49,8 @@ enum {
struct v4lcontrol_data;
-struct v4lcontrol_data *v4lcontrol_create(int fd, int always_needs_conversion);
+struct v4lcontrol_data *v4lcontrol_create(int fd, void *dev_ops_priv,
+ struct libv4l2_dev_ops *dev_ops, int always_needs_conversion);
void v4lcontrol_destroy(struct v4lcontrol_data *data);
/* Functions used by v4lprocessing to get the control state */
diff --git a/lib/libv4lconvert/libv4lconvert-priv.h
b/lib/libv4lconvert/libv4lconvert-priv.h
index d8fe899..edc118b 100644
--- a/lib/libv4lconvert/libv4lconvert-priv.h
+++ b/lib/libv4lconvert/libv4lconvert-priv.h
@@ -65,6 +65,8 @@ struct v4lconvert_data {
unsigned char *convert_pixfmt_buf;
struct v4lcontrol_data *control;
struct v4lprocessing_data *processing;
+ struct libv4l2_dev_ops *dev_ops;
+ void *dev_ops_priv;
/* Data for external decompression helpers code */
pid_t decompress_pid;
diff --git a/lib/libv4lconvert/libv4lconvert.c
b/lib/libv4lconvert/libv4lconvert.c
index 0d8b29f..f6e0327 100644
--- a/lib/libv4lconvert/libv4lconvert.c
+++ b/lib/libv4lconvert/libv4lconvert.c
@@ -91,7 +91,8 @@ static const int v4lconvert_crop_res[][2] = {
{ 176, 144 },
};
-struct v4lconvert_data *v4lconvert_create(int fd)
+struct v4lconvert_data *v4lconvert_create(int fd, void *dev_ops_priv,
+ struct libv4l2_dev_ops *dev_ops)
{
int i, j;
struct v4lconvert_data *data = calloc(1, sizeof(struct
v4lconvert_data));
@@ -107,6 +108,8 @@ struct v4lconvert_data *v4lconvert_create(int fd)
}
data->fd = fd;
+ data->dev_ops = dev_ops;
+ data->dev_ops_priv = dev_ops_priv;
data->decompress_pid = -1;
/* Check supported formats */
@@ -115,7 +118,7 @@ struct v4lconvert_data *v4lconvert_create(int fd)
fmt.index = i;
- if (SYS_IOCTL(data->fd, VIDIOC_ENUM_FMT,&fmt))
+ if (data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
VIDIOC_ENUM_FMT,&fmt))
break;
for (j = 0; j< ARRAY_SIZE(supported_src_pixfmts); j++)
@@ -134,7 +137,8 @@ struct v4lconvert_data *v4lconvert_create(int fd)
data->no_formats = i;
/* Check if this cam has any special flags */
- if (SYS_IOCTL(data->fd, VIDIOC_QUERYCAP,&cap) == 0) {
+ if (data->dev_ops->ioctl(data->dev_ops_priv,
+ data->fd, VIDIOC_QUERYCAP,&cap) == 0) {
if (!strcmp((char *)cap.driver, "uvcvideo"))
data->flags |= V4LCONVERT_IS_UVC;
@@ -142,7 +146,8 @@ struct v4lconvert_data *v4lconvert_create(int fd)
always_needs_conversion = 0;
}
- data->control = v4lcontrol_create(fd, always_needs_conversion);
+ data->control = v4lcontrol_create(fd, dev_ops_priv, dev_ops,
+ always_needs_conversion);
if (!data->control) {
free(data);
return NULL;
@@ -205,7 +210,8 @@ int v4lconvert_enum_fmt(struct v4lconvert_data *data,
struct v4l2_fmtdesc *fmt)
if (fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
(!v4lconvert_supported_dst_fmt_only(data)&&
fmt->index< data->no_formats))
- return SYS_IOCTL(data->fd, VIDIOC_ENUM_FMT, fmt);
+ return data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_ENUM_FMT, fmt);
for (i = 0; i< ARRAY_SIZE(supported_dst_pixfmts); i++)
if (v4lconvert_supported_dst_fmt_only(data) ||
@@ -313,7 +319,8 @@ static int v4lconvert_do_try_format(struct v4lconvert_data
*data,
try_fmt = *dest_fmt;
try_fmt.fmt.pix.pixelformat = supported_src_pixfmts[i].fmt;
- if (!SYS_IOCTL(data->fd, VIDIOC_TRY_FMT,&try_fmt)) {
+ if (!data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_TRY_FMT,&try_fmt)) {
if (try_fmt.fmt.pix.pixelformat ==
supported_src_pixfmts[i].fmt) {
int size_x_diff =
abs((int)try_fmt.fmt.pix.width -
(int)dest_fmt->fmt.pix.width);
@@ -381,7 +388,8 @@ int v4lconvert_try_format(struct v4lconvert_data *data,
if (!v4lconvert_supported_dst_format(dest_fmt->fmt.pix.pixelformat) ||
dest_fmt->type != V4L2_BUF_TYPE_VIDEO_CAPTURE ||
v4lconvert_do_try_format(data,&try_dest,&try_src)) {
- result = SYS_IOCTL(data->fd, VIDIOC_TRY_FMT, dest_fmt);
+ result = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_TRY_FMT,
dest_fmt);
if (src_fmt)
*src_fmt = *dest_fmt;
return result;
@@ -1236,7 +1244,8 @@ static void v4lconvert_get_framesizes(struct
v4lconvert_data *data,
for (i = 0; ; i++) {
frmsize.index = i;
- if (SYS_IOCTL(data->fd, VIDIOC_ENUM_FRAMESIZES,&frmsize))
+ if (data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_ENUM_FRAMESIZES,&frmsize))
break;
/* We got a framesize, check we don't have the same one already
*/
@@ -1296,7 +1305,8 @@ int v4lconvert_enum_framesizes(struct v4lconvert_data
*data,
errno = EINVAL;
return -1;
}
- return SYS_IOCTL(data->fd, VIDIOC_ENUM_FRAMESIZES, frmsize);
+ return data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_ENUM_FRAMESIZES,
frmsize);
}
if (frmsize->index>= data->no_framesizes) {
@@ -1332,7 +1342,8 @@ int v4lconvert_enum_frameintervals(struct v4lconvert_data
*data,
errno = EINVAL;
return -1;
}
- res = SYS_IOCTL(data->fd, VIDIOC_ENUM_FRAMEINTERVALS, frmival);
+ res = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_ENUM_FRAMEINTERVALS, frmival);
if (res)
V4LCONVERT_ERR("%s\n", strerror(errno));
return res;
@@ -1377,7 +1388,8 @@ int v4lconvert_enum_frameintervals(struct v4lconvert_data
*data,
frmival->pixel_format = src_fmt.fmt.pix.pixelformat;
frmival->width = src_fmt.fmt.pix.width;
frmival->height = src_fmt.fmt.pix.height;
- res = SYS_IOCTL(data->fd, VIDIOC_ENUM_FRAMEINTERVALS, frmival);
+ res = data->dev_ops->ioctl(data->dev_ops_priv, data->fd,
+ VIDIOC_ENUM_FRAMEINTERVALS, frmival);
if (res) {
int dest_pixfmt = dest_fmt.fmt.pix.pixelformat;
int src_pixfmt = src_fmt.fmt.pix.pixelformat;
--
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