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v4l2ctl.c
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v4l2ctl.c
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/* gst-webrtc-camera
* Copyright (C) 2023 chunyang liu <yjdwbj@gmail.com>
*
*
* v4l2ctl.c: set user controls of video
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library 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
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
* Boston, MA 02110-1301, USA.
*/
#include "v4l2ctl.h"
#include "media.h"
#include <dirent.h>
#include <json-glib/json-glib.h>
#include <libudev.h>
#include <linux/media.h>
#include <sys/types.h>
static int ctrl_list[] = {V4L2_CID_BRIGHTNESS, V4L2_CID_CONTRAST, V4L2_CID_AUTO_WHITE_BALANCE, V4L2_CID_SHARPNESS, V4L2_CID_WHITENESS};
const char *video_driver[] = {
"sun6i-csi",
"imx-media"};
const char *video_capture[] = {
"sun6i-csi-capture",
"ipu1_csi1 capture"};
GHashTable *initial_capture_hashtable() {
GHashTable *hash = g_hash_table_new(g_str_hash, g_str_equal);
g_hash_table_insert(hash, "sun6i-csi-capture",
"v4l2src device=%s num-buffers=-1 !"
" video/x-raw,pixelformat=%s,width=%d, height=%d,framerate=%d/1 !"
" v4l2h264enc capture-io-mode=4 output-io-mode=4 ! queue !"
" rtph264pay config-interval=1 pt=96 ! "
" udpsink host=%s port=%d auto-multicast=true async=false sync=false");
g_hash_table_insert(hash, "ipu1_csi1 capture", "Treats");
printf("There are %d keys in the hash table\n",
g_hash_table_size(hash));
// printf("Jazzy likes %s\n", g_hash_table_lookup(hash, "Jazzy"));
// g_hash_table_destroy(hash);
return hash;
}
static gchar *
get_string_from_json_object(JsonObject *object) {
JsonNode *root;
JsonGenerator *generator;
gchar *text;
/* Make it the root node */
root = json_node_init_object(json_node_alloc(), object);
generator = json_generator_new();
json_generator_set_root(generator, root);
text = json_generator_to_data(generator, NULL);
/* Release everything */
g_object_unref(generator);
json_node_free(root);
return text;
}
gchar *
get_device_json(const gchar *device) {
int fd;
gchar *devStr;
struct v4l2_queryctrl queryctrl;
struct v4l2_control control;
JsonObject *devJson;
JsonObject *ctrlJson;
// Open the device file
fd = open(device, O_RDWR | O_NONBLOCK);
if (fd < 0) {
return NULL;
}
memset(&queryctrl, 0, sizeof(queryctrl));
memset(&control, 0, sizeof(control));
devJson = json_object_new();
ctrlJson = json_object_new();
json_object_set_string_member(devJson, "name", device);
for (int i = 0; i < sizeof(ctrl_list) / sizeof(int); i++) {
queryctrl.id = ctrl_list[i];
if ((0 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl))) {
JsonObject *item = json_object_new();
json_object_set_int_member(item, "id", queryctrl.id);
json_object_set_int_member(item, "min", queryctrl.minimum);
json_object_set_int_member(item, "max", queryctrl.maximum);
json_object_set_int_member(item, "default", queryctrl.default_value);
json_object_set_int_member(item, "step", queryctrl.step);
json_object_set_int_member(item, "type", queryctrl.type);
control.id = queryctrl.id;
if (0 == ioctl(fd, VIDIOC_G_CTRL, &control)) {
json_object_set_int_member(item, "value", control.value);
} else if (errno != EINVAL) {
g_print("not get the value of: %s\n", queryctrl.name);
}
json_object_set_object_member(ctrlJson, (gchar *)queryctrl.name, item);
}
}
close(fd);
json_object_set_object_member(devJson, "ctrls", ctrlJson);
devStr = get_string_from_json_object(devJson);
json_object_unref(devJson);
return devStr;
}
int set_ctrl_value(const gchar *device, int ctrl_id, int ctrl_val) {
int fd;
int ret = 0;
struct v4l2_control control;
memset(&control, 0, sizeof(control));
// Open the device file
fd = open(device, O_RDWR);
if (fd < 0) {
return fd;
}
control.id = ctrl_id;
if ((ret = ioctl(fd, VIDIOC_G_CTRL, &control)) == 0) {
control.value = ctrl_val;
/* The driver may clamp the value or return ERANGE, ignored here */
if ((ret = ioctl(fd, VIDIOC_S_CTRL, &control)) == -1 && errno != ERANGE) {
perror("VIDIOC_S_CTRL");
g_print("Can not set ctrl value to device!\n");
goto lret;
}
/* Ignore if V4L2_CID_CONTRAST is unsupported */
} else if (errno != EINVAL) {
g_print("Can not get ctrl value!\n");
ret = -1;
}
lret:
close(fd);
return 0;
}
int reset_user_ctrls(const gchar *device) {
int ret = 0;
int fd;
struct v4l2_queryctrl queryctrl;
struct v4l2_control control;
memset(&control, 0, sizeof(control));
memset(&queryctrl, 0, sizeof(queryctrl));
// Open the device file
fd = open(device, O_RDWR);
if (fd < 0) {
return fd;
}
queryctrl.id = V4L2_CTRL_CLASS_USER | V4L2_CTRL_FLAG_NEXT_CTRL;
while (0 == ioctl(fd, VIDIOC_QUERYCTRL, &queryctrl)) {
// jetson nano b01 imx219 only have Camera class controls, Not yet support it. V4L2_CTRL_CLASS_CAMERA 0x009a0000
if (V4L2_CTRL_ID2CLASS(queryctrl.id) != V4L2_CTRL_CLASS_USER)
break;
if (queryctrl.flags & V4L2_CTRL_FLAG_DISABLED)
continue;
if (queryctrl.id < V4L2_CID_BASE) {
queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
continue;
}
// if (queryctrl.type == V4L2_CTRL_TYPE_MENU)
// enumerate_menu(fd);
// g_print("QueryID %d, V4L2_CID_BASE :%d ,V4L2_CID_CONTRAST :%d \n", queryctrl.id, V4L2_CID_BASE, V4L2_CID_CONTRAST);
control.id = queryctrl.id;
if (0 == (ret = ioctl(fd, VIDIOC_G_CTRL, &control))) {
control.value = queryctrl.default_value;
/* The driver may clamp the value or return ERANGE, ignored here */
// g_print("Control %s, min:%d, max: %d, default: %d \n", queryctrl.name, queryctrl.minimum, queryctrl.maximum, queryctrl.default_value);
if ((ret = ioctl(fd, VIDIOC_S_CTRL, &control) == -1) && errno != ERANGE) {
g_print("not change the value of: %s\n", queryctrl.name);
goto lret;
}
/* Ignore if V4L2_CID_CONTRAST is unsupported */
} else if (errno != EINVAL) {
g_print("not get the value of: %s\n", queryctrl.name);
ret = -1;
goto lret;
}
queryctrl.id |= V4L2_CTRL_FLAG_NEXT_CTRL;
}
if (errno != EINVAL) {
perror("VIDIOC_QUERYCTRL");
ret = -1;
goto lret;
}
lret:
close(fd);
return ret;
}
static gchar *num2s(unsigned num, gboolean is_hex) {
return (is_hex ? g_strdup_printf("0x%08x", num) : g_strdup_printf("%u", num));
}
static void buftype2s(int type) {
gchar *tstr;
switch (type) {
case V4L2_BUF_TYPE_VIDEO_CAPTURE:
tstr = (char *)"Video Capture";
break;
case V4L2_BUF_TYPE_VIDEO_CAPTURE_MPLANE:
tstr = (char *)"Video Capture Multiplanar";
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT:
tstr = (char *)"Video Output";
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE:
tstr = (char *)"Video Output Multiplanar";
break;
case V4L2_BUF_TYPE_VIDEO_OVERLAY:
tstr = (char *)"Video Overlay";
break;
case V4L2_BUF_TYPE_VBI_CAPTURE:
tstr = (char *)"VBI Capture";
break;
case V4L2_BUF_TYPE_VBI_OUTPUT:
tstr = (char *)"VBI Output";
break;
case V4L2_BUF_TYPE_SLICED_VBI_CAPTURE:
tstr = (char *)"Sliced VBI Capture";
break;
case V4L2_BUF_TYPE_SLICED_VBI_OUTPUT:
tstr = (char *)"Sliced VBI Output";
break;
case V4L2_BUF_TYPE_VIDEO_OUTPUT_OVERLAY:
tstr = (char *)"Video Output Overlay";
break;
case V4L2_BUF_TYPE_SDR_CAPTURE:
tstr = (char *)"SDR Capture";
break;
case V4L2_BUF_TYPE_SDR_OUTPUT:
tstr = (char *)"SDR Output";
break;
case V4L2_BUF_TYPE_META_CAPTURE:
tstr = (char *)"Metadata Capture";
break;
case V4L2_BUF_TYPE_META_OUTPUT:
tstr = (char *)"Metadata Output";
break;
case V4L2_BUF_TYPE_PRIVATE:
tstr = (char *)"Private";
break;
default: {
gchar *tmp = num2s(type, TRUE);
g_print("Unknown (%s)\n", tmp);
g_free(tmp);
return;
}
}
g_print("Type: %s\n", tstr);
}
static gchar *fcc2s(__u32 val) {
gchar *s;
s = g_strdup_printf("%c%c%c%c",
val & 0x7f,
(val >> 8) & 0x7f,
(val >> 16) & 0x7f,
(val >> 24) & 0x7f);
if (val & (1U << 31)) {
gchar *tmp = g_strconcat(s, "-BE", NULL);
g_free(s);
return tmp;
}
return s;
}
static gchar *frmtype2s(unsigned type) {
static char *types[] = {
"Unknown",
"Discrete",
"Continuous",
"Stepwise"};
if (type > 3)
type = 0;
return types[type];
}
static gchar *fract2sec(struct v4l2_fract *f) {
return g_strdup_printf("%.3f", (1.0 * f->numerator) / f->denominator);
}
static gchar *fract2fps(struct v4l2_fract *f) {
return g_strdup_printf("%.3f", (1.0 * f->denominator) / f->numerator);
}
void print_frmsize(struct v4l2_frmsizeenum *frmsize, const char *prefix) {
g_print("%s\tSize: %s ", prefix, frmtype2s(frmsize->type));
if (frmsize->type == V4L2_FRMSIZE_TYPE_DISCRETE) {
g_print("%dx%d\n", frmsize->discrete.width, frmsize->discrete.height);
} else if (frmsize->type == V4L2_FRMSIZE_TYPE_CONTINUOUS) {
g_print("%dx%d - %dx%d\n",
frmsize->stepwise.min_width,
frmsize->stepwise.min_height,
frmsize->stepwise.max_width,
frmsize->stepwise.max_height);
} else if (frmsize->type == V4L2_FRMSIZE_TYPE_STEPWISE) {
g_print("%dx%d - %dx%d with step %d/%d\n",
frmsize->stepwise.min_width,
frmsize->stepwise.min_height,
frmsize->stepwise.max_width,
frmsize->stepwise.max_height,
frmsize->stepwise.step_width,
frmsize->stepwise.step_height);
}
}
void print_frmival(struct v4l2_frmivalenum *frmival, const char *prefix) {
gchar *mins, *maxs, *minf, *maxf;
g_print("%s\tInterval: %s ", prefix, frmtype2s(frmival->type));
if (frmival->type == V4L2_FRMIVAL_TYPE_DISCRETE) {
mins = fract2sec(&frmival->discrete);
minf = fract2fps(&frmival->discrete);
g_print("%ss (%s fps)\n", mins, minf);
g_free(mins);
g_free(minf);
} else if (frmival->type == V4L2_FRMIVAL_TYPE_CONTINUOUS) {
mins = fract2sec(&frmival->stepwise.min);
maxs = fract2sec(&frmival->stepwise.max);
maxf = fract2fps(&frmival->stepwise.max);
minf = fract2fps(&frmival->stepwise.min);
g_print("%ss - %ss (%s-%s fps)\n", mins, maxs, minf, maxf);
g_free(mins);
g_free(maxs);
g_free(minf);
g_free(maxf);
} else if (frmival->type == V4L2_FRMIVAL_TYPE_STEPWISE) {
gchar *step;
mins = fract2sec(&frmival->stepwise.min);
maxs = fract2sec(&frmival->stepwise.max);
step = fract2sec(&frmival->stepwise.step);
maxf = fract2fps(&frmival->stepwise.max);
minf = fract2fps(&frmival->stepwise.min);
g_print("%ss - %ss with step %ss (%s-%s fps)\n", mins, maxs, step, minf, maxf);
g_free(mins);
g_free(maxs);
g_free(minf);
g_free(maxf);
g_free(step);
}
}
static int device_cap_info(int fd, struct v4l2_capability *caps) {
int ret;
ret = ioctl(fd, VIDIOC_QUERYCAP, caps);
if (ret)
return -errno;
return 0;
}
int dump_video_device_fmt(const gchar *device) {
int fd;
gchar *tmp = NULL;
struct v4l2_fmtdesc fmtdesc;
struct v4l2_frmsizeenum frmsize;
struct v4l2_frmivalenum frmval;
memset(&fmtdesc, 0, sizeof(fmtdesc));
memset(&frmsize, 0, sizeof(frmsize));
memset(&frmval, 0, sizeof(frmval));
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmtdesc.index = 0;
fmtdesc.mbus_code = 0;
// Open the device file
fd = open(device, O_RDWR);
if (fd < 0) {
return fd;
}
g_print("ioctl: VIDIOC_ENUM_FMT\n");
buftype2s(fmtdesc.type);
for (; 0 == ioctl(fd, VIDIOC_ENUM_FMT, &fmtdesc); fmtdesc.index++) {
tmp = fcc2s(fmtdesc.pixelformat);
if (fmtdesc.flags & V4L2_FMT_FLAG_COMPRESSED) {
g_print("\t[%d]: '%s' (%s, compressed)\n", fmtdesc.index, tmp, fmtdesc.description);
} else {
g_print("\t[%d]: '%s' (%s)\n", fmtdesc.index, tmp, fmtdesc.description);
}
g_free(tmp);
frmsize.pixel_format = fmtdesc.pixelformat;
frmsize.index = 0;
for (; 0 == ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &frmsize); frmsize.index++) {
if (frmsize.type != V4L2_FRMSIZE_TYPE_DISCRETE)
continue;
print_frmsize(&frmsize, "\t");
frmval.pixel_format = fmtdesc.pixelformat;
frmval.index = 0;
frmval.width = frmsize.discrete.width;
frmval.height = frmsize.discrete.height;
for (; 0 == ioctl(fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmval); frmval.index++) {
print_frmival(&frmval, "\t\t");
}
}
}
close(fd);
return 0;
}
static gchar *get_video_path(struct udev *udev, int major, int minor) {
gchar *path = NULL;
struct udev_device *device;
dev_t devnum;
devnum = makedev(major, minor);
device = udev_device_new_from_devnum(udev, 'c', devnum);
if (!device) {
return NULL;
}
// will get path as /dev/videoX
path = g_strdup(udev_device_get_devnode(device));
g_print("get devnode path is: %s\n", path);
udev_device_unref(device);
return path;
}
#if 0
static gchar *get_udev_path(int major, int minor) {
gchar *tmp= g_strdup_printf("%s/%d:%d/uevent", "/sys/dev/char", major, minor);
return tmp;
}
static gchar *get_udev_devnode_name(const gchar *uevent_path) {
FILE *fp;
gchar *video_path = NULL;
gchar *line = NULL;
size_t len = 0;
ssize_t read;
/**
* @brief
* example of read from sysfs.
* ~$ cat /sys/dev/char/81\:6/uevent
* MAJOR = 81
* MINOR = 6
* DEVNAME = video4
*/
fp = fopen(uevent_path, "r");
if (fp == NULL)
return NULL;
while ((read = getline(&line, &len, fp)) != -1) {
// g_print("Retrieved line of length %zu :\n", read);
// g_print("%s", line);
char **pairs;
pairs = g_strsplit(line, "=", 2);
if (pairs[0] != NULL && pairs[1] != NULL) {
g_strchomp(pairs[0]);
if (g_strcmp0(pairs[0], "DEVNAME") == 0 && g_str_has_prefix(pairs[1], "video")) {
g_strchomp(pairs[1]);
video_path = g_strdup_printf("/dev/%s", pairs[1]);
struct v4l2_capability caps;
// Open the device file
int fd = open(video_path, O_RDWR | O_NONBLOCK);
if (fd > 0) {
if (0 == device_cap_info(fd, &caps)) {
// g_print("csi ioctl: cap info: %s\n", (const gchar *)(caps.bus_info));
if (caps.device_caps & V4L2_CAP_VIDEO_CAPTURE) {
break;
}
}
close(fd);
}
}
}
g_strfreev(pairs);
}
fclose(fp);
return video_path;
}
#endif
static void get_capture_fmt_video(_v4l2src_data *data) {
struct v4l2_format vfmt;
struct v4l2_capability caps;
int fd = open(data->device, O_RDWR | O_NONBLOCK);
if (fd > 0) {
if (0 == device_cap_info(fd, &caps)) {
if (caps.device_caps & V4L2_CAP_VIDEO_CAPTURE) {
memset(&vfmt, 0, sizeof(vfmt));
vfmt.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
vfmt.fmt.pix.width = 640;
vfmt.fmt.pix.height = 480;
vfmt.fmt.pix.pixelformat = V4L2_PIX_FMT_NV12;
vfmt.fmt.pix.field = V4L2_FIELD_INTERLACED;
// vfmt.fmt.pix.priv = priv_magic;
// vfmt.type = vidout_buftype;
if (ioctl(fd, VIDIOC_S_FMT, &vfmt) == 0){
data->width = vfmt.fmt.pix.width;
data->height = vfmt.fmt.pix.height;
data->format = fcc2s(vfmt.fmt.pix.pixelformat);
}
}
}
close(fd);
}
}
static gboolean get_default_capture_device(_v4l2src_data *data) {
// This is used if the wrong video configuration is set but a valid device is found on the system.
gboolean match = FALSE;
int fd = -1;
struct v4l2_fmtdesc fmtdesc;
struct v4l2_frmsizeenum frmsize;
struct v4l2_frmivalenum frmval;
struct v4l2_capability capability;
memset(&fmtdesc, 0, sizeof(fmtdesc));
memset(&frmsize, 0, sizeof(frmsize));
memset(&frmval, 0, sizeof(frmval));
fmtdesc.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
fmtdesc.index = 0;
fmtdesc.mbus_code = 0;
fd = open(data->device, O_RDWR | O_NONBLOCK);
if (fd < 0) {
return match;
}
if (0 != device_cap_info(fd, &capability)) {
goto invalid_dev;
}
if (g_str_has_prefix((const gchar *)&capability.bus_info, "platform:")) {
goto invalid_dev;
}
for (; 0 == ioctl(fd, VIDIOC_ENUM_FMT, &fmtdesc) && !match; fmtdesc.index++) {
frmsize.pixel_format = fmtdesc.pixelformat;
frmsize.index = 0;
for (; 0 == ioctl(fd, VIDIOC_ENUM_FRAMESIZES, &frmsize) && !match; frmsize.index++) {
if (frmsize.type != V4L2_FRMSIZE_TYPE_DISCRETE)
continue;
data->width = frmsize.discrete.width;
data->height = frmsize.discrete.height;
frmval.pixel_format = fmtdesc.pixelformat;
frmval.index = 0;
frmval.width = frmsize.discrete.width;
frmval.height = frmsize.discrete.height;
for (; 0 == ioctl(fd, VIDIOC_ENUM_FRAMEINTERVALS, &frmval); frmval.index++) {
gfloat fps = ((1.0 * frmval.discrete.denominator) / frmval.discrete.numerator);
data->framerate = (int)fps;
match = TRUE;
g_warning("!!!found an valid device: %dx%d/%d at %s\n", data->width, data->height, data->framerate, data->device);
break;
}
}
}
invalid_dev:
g_print("not found current size\n");
close(fd);
return match;
}
#if 0
static int enumerate_entity_desc(int media_fd, struct media_v2_topology *topology) {
struct media_entity_desc ent_desc;
memset(&ent_desc, 0, sizeof(ent_desc));
ent_desc.id = MEDIA_ENT_ID_FLAG_NEXT;
while (!ioctl(media_fd, MEDIA_IOC_ENUM_ENTITIES, &ent_desc)) {
g_print("entities name: %s, major: %d, minor: %d \n",
(const gchar *)(ent_desc.name), ent_desc.dev.major, ent_desc.dev.minor);
gchar *ueventpath = get_udev_path(ent_desc.dev.major, ent_desc.dev.minor);
gchar *video_path = get_udev_devnode_name(ueventpath);
g_free(ueventpath);
if (video_path) {
g_print("find video name: %s, major: %d, minor: %d \n",
(const gchar *)(ent_desc.name), ent_desc.dev.major, ent_desc.dev.minor);
}
struct media_links_enum links_enum;
struct media_pad_desc pads[ent_desc.pads];
struct media_link_desc links[ent_desc.links];
memset(&links_enum, 0, sizeof(links_enum));
links_enum.entity = ent_desc.id;
links_enum.pads = pads;
links_enum.links = links;
if (ioctl(media_fd, MEDIA_IOC_ENUM_LINKS, &links_enum))
return ent_desc.id;
for (unsigned i = 0; i < ent_desc.pads; i++)
printf("\tPad : %u\n", pads[i].index);
for (unsigned i = 0; i < ent_desc.links; i++)
printf("\tLink : %u->%u:\n",
links[i].source.entity,
links[i].sink.entity);
ent_desc.id |= MEDIA_ENT_ID_FLAG_NEXT;
}
return 0;
}
#endif
static gchar *find_capture_path_by_udev(int media_fd, struct media_v2_topology *topology,
struct udev *udev, const gchar *capture) {
struct media_entity_desc ent_desc;
gchar *video_path = NULL;
memset(&ent_desc, 0, sizeof(ent_desc));
ent_desc.id = MEDIA_ENT_ID_FLAG_NEXT;
while (!ioctl(media_fd, MEDIA_IOC_ENUM_ENTITIES, &ent_desc)) {
// g_print("entities name: %s, major: %d, minor: %d \n",
// (const gchar *)(ent_desc.name), ent_desc.dev.major, ent_desc.dev.minor);
if(g_strcmp0(ent_desc.name,capture) == 0) {
video_path = get_video_path(udev, ent_desc.v4l.major, ent_desc.v4l.minor);
if (video_path) {
// g_print("find video name: %s, major: %d, minor: %d , path: %s \n",
// (const gchar *)(ent_desc.name), ent_desc.dev.major, ent_desc.dev.minor, video_path);
break;
}
}
ent_desc.id |= MEDIA_ENT_ID_FLAG_NEXT;
}
return video_path;
}
static int media_device_probe(_v4l2src_data *data, struct udev *udev,
const char *path) {
struct media_device_info device_info = {0};
struct media_v2_topology topology = {0};
// struct media_v2_entity *encoder_entity;
// struct media_v2_interface *encoder_interface;
int media_fd = -1;
int ret = -1, i;
media_fd = open(path, O_RDWR | O_NONBLOCK);
if (media_fd < 0)
return -errno;
ret = media_device_info(media_fd, &device_info);
if (ret)
return -errno;
ret = media_topology_get(media_fd, &topology);
struct media_v2_entity v2_ents[topology.num_entities];
struct media_v2_interface v2_ifaces[topology.num_interfaces];
struct media_v2_pad v2_pads[topology.num_pads];
struct media_v2_link v2_links[topology.num_links];
topology.ptr_entities = (__u64)v2_ents;
topology.ptr_interfaces = (__u64)v2_ifaces;
topology.ptr_pads = (__u64)v2_pads;
topology.ptr_links = (__u64)v2_links;
ret = media_device_info(media_fd, &device_info);
if (ret)
goto perror;
g_print("driver name: %s,bus: %s , model: %s, serial: %s\n",
(const gchar *)(device_info.driver), device_info.bus_info, device_info.model, device_info.serial);
ret = media_topology_get(media_fd, &topology);
if (ret)
goto perror;
if (!topology.num_interfaces || !topology.num_entities ||
!topology.num_pads || !topology.num_links) {
ret = -ENODEV;
goto perror;
}
ret = -1;
// g_print("----------------------------->\n");
for (i = 0; i < sizeof(video_capture) / sizeof(char *); i++) {
gchar *vpath = find_capture_path_by_udev(media_fd, &topology,udev, video_capture[i]);
if(vpath != NULL) {
g_print("found capture device is: %s\n",vpath);
g_free(data->device);
data->device = g_strdup(vpath);
data->spec_drv = g_strdup(video_capture[i]);
g_free(vpath);
get_capture_fmt_video(data);
ret = 0;
break;
}
}
// g_print("<----------------------------\n");
// encoder_entity = media_topology_entity_find_by_function(&topology,
// MEDIA_ENT_F_IO_V4L);
// if (encoder_entity) {
// g_print("encoder_entity name: %s, id: %d \n",
// (const gchar *)(encoder_entity->name), encoder_entity->id);
// }
#if 0
for (i = 0; i < sizeof(video_capture) / sizeof(char *); i++) {
encoder_entity = media_topology_entity_find_by_name(&topology, video_capture[i]);
if (encoder_entity) {
g_print("supported video capture: %s\n", video_capture[i]);
for (j = 0; j < topology.num_interfaces; j++)
{
const struct media_v2_interface *iface = &v2_ifaces[j];
if(iface->flags == encoder_entity->flags) {
gchar *vpath = get_video_path(udev, iface->devnode.major, iface->devnode.minor);
if(vpath != NULL) {
g_print("found video capture path: %s\n", vpath);
g_free(vpath);
break;
}
}
}
break;
}
if (0 == g_strcmp0(video_driver[i], device_info.driver)) {
break;
}
}
if (i == sizeof(video_driver) / sizeof(char *)) {
g_print("Not found supported video driver\n");
ret == -1;
goto perror;
}
#endif
#if 0
for (i = 0; i < sizeof(video_driver) / sizeof(char *); i++) {
g_print("supported video driver: %s\n", video_driver[i]);
if (0 == g_strcmp0(video_driver[i], device_info.driver))
{
break;
}
}
if (i == sizeof(video_driver) / sizeof(char *)) {
g_print("Not found supported video driver\n");
ret == -1;
}
#endif
#if 0
struct udev_device *device;
struct media_v2_pad *sink_pad;
struct media_v2_link *sink_link;
struct media_v2_pad *source_pad;
struct media_v2_link *source_link;
dev_t devnum;
sink_pad = media_topology_pad_find_by_entity(&topology,
encoder_entity->id,
MEDIA_PAD_FL_SINK);
if (!sink_pad) {
ret = -ENODEV;
goto perror;
}
sink_link = media_topology_link_find_by_pad(&topology, sink_pad->id,
sink_pad->flags);
if (!sink_link) {
ret = -ENODEV;
goto perror;
}
source_pad = media_topology_pad_find_by_id(&topology,
sink_link->source_id);
if (!source_pad) {
ret = -ENODEV;
goto perror;
}
source_link = media_topology_link_find_by_entity(&topology,
source_pad->entity_id,
MEDIA_PAD_FL_SINK);
if (!source_link) {
ret = -ENODEV;
goto perror;
}
encoder_interface = media_topology_interface_find_by_id(&topology,
source_link->source_id);
if (!encoder_interface) {
ret = -ENODEV;
goto perror;
}
devnum = makedev(encoder_interface->devnode.major,
encoder_interface->devnode.minor);
device = udev_device_new_from_devnum(udev, 'c', devnum);
if (!device) {
ret = -ENODEV;
goto perror;
}
// will get path as /dev/v4l-subdev0
path = udev_device_get_devnode(device);
g_print("get devnode path is: %s\n", path);
#endif
perror:
if (media_fd >= 0)
close(media_fd);
return ret;
}
/**
* v4l2-ctl -d /dev/v4l-subdev0 -D
* Driver Info:
* Driver version : 6.9.8
* Capabilities : 0x00000000
* Media Driver Info:
* Driver name : sun6i-csi
* Model : Allwinner A31 CSI Device
* Serial :
* Bus info : platform:1cb0000.csi
* Media version : 6.9.8
* Hardware revision: 0x00000000 (0)
* Driver version : 6.9.8
* Interface Info:
* ID : 0x03000008
* Type : V4L Sub-Device
* Entity Info:
* ID : 0x00000001 (1)
* Name : sun6i-csi-bridge
* Function : Video Interface Bridge
* Pad 0x01000002 : 0: Sink
* Link 0x02000006: from remote pad 0x1000005 of entity 'ov2640 2-0030' (Camera Sensor): Data, Enabled
* Pad 0x01000003 : 1: Source, Must Connect
* Link 0x02000010: to remote pad 0x100000d of entity 'sun6i-csi-capture' (V4L2 I/O): Data, Enabled, Immutable
*/
static int enumerate_udev_list(_v4l2src_data *data) {
struct udev *udev = NULL;
struct udev_enumerate *enumerate = NULL;
struct udev_list_entry *devices;
struct udev_list_entry *entry;
int ret;
udev = udev_new();
if (!udev)
goto error;
enumerate = udev_enumerate_new(udev);
if (!enumerate)
goto error;
udev_enumerate_add_match_subsystem(enumerate, "media");
udev_enumerate_scan_devices(enumerate);
devices = udev_enumerate_get_list_entry(enumerate);
udev_list_entry_foreach(entry, devices) {
struct udev_device *device;
const char *path;
path = udev_list_entry_get_name(entry);
if (!path)
continue;
device = udev_device_new_from_syspath(udev, path);
if (!device)
continue;
// example path is: /sys/devices/platform/soc/1c0e000.video-codec/media0
const char *mpath = udev_device_get_devnode(device); /* /dev/media0 */
ret = media_device_probe(data, udev, mpath);
g_print("read path is:%s , ret: %d\n", mpath, ret);
udev_device_unref(device);
if (!ret)
break;
}
ret = 0;
goto complete;
error:
ret = -1;
complete:
if (enumerate)
udev_enumerate_unref(enumerate);
if (udev)
udev_unref(udev);
return ret;
}
#if 0
gboolean get_default_subdev_device(_v4l2src_data *data) {
struct media_device_info device_info = {0};
struct media_v2_topology topology = {0};
struct media_v2_entity *encoder_entity;
struct stat sb;
gboolean found = FALSE;
unsigned int major, minor;
struct media_entity_desc ent_desc;
int media_fd = -1;
int video_fd = -1;
dev_t devnum;
int ret, i, j;
media_fd = open(data->device, O_RDWR | O_NONBLOCK);
if (media_fd < 0)
return -errno;
if (fstat(media_fd, &sb) == -1) {
fprintf(stderr, "failed to stat file\n");
}
ret = media_device_info(media_fd, &device_info);
if (ret)
return -errno;
media_topology_get(media_fd, &topology);
struct media_v2_entity v2_ents[topology.num_entities];
struct media_v2_interface v2_ifaces[topology.num_interfaces];
struct media_v2_pad v2_pads[topology.num_pads];
struct media_v2_link v2_links[topology.num_links];
topology.ptr_entities = (__u64)v2_ents;
topology.ptr_interfaces = (__u64)v2_ifaces;
topology.ptr_pads = (__u64)v2_pads;
topology.ptr_links = (__u64)v2_links;
ret = media_device_info(media_fd, &device_info);
if (ret)
goto merror;
g_print("driver name: %s,bus: %s , model: %s, serial: %s\n",
(const gchar *)(device_info.driver),device_info.bus_info,device_info.model, device_info.serial);
ret = media_topology_get(media_fd, &topology);
if (ret)
goto merror;
if (!topology.num_interfaces || !topology.num_entities ||
!topology.num_pads || !topology.num_links) {
ret = -ENODEV;
goto merror;
}
encoder_entity = media_topology_entity_find_by_function(&topology,
MEDIA_ENT_F_IO_V4L);
if (encoder_entity) {
g_print("encoder_entity name: %s, id: %d \n",
(const gchar *)(encoder_entity->name), encoder_entity->id);
}
enumerate_entity_desc(media_fd,&topology);
const struct media_v2_interface *iface = &v2_ifaces[i];
for (i = 0; i < topology.num_links; i++) {
__u32 type = v2_links[i].flags & MEDIA_LNK_FL_LINK_TYPE;
if (type != MEDIA_LNK_FL_INTERFACE_LINK)
continue;
if (v2_links[i].source_id == iface->id)
break;
}
g_print("interface Info: major: %d, minor: %d\n", iface->devnode.major,iface->devnode.minor);
const struct media_v2_entity *ent = &v2_ents[i];
g_print("Entity Info:\n");
g_print("\tID : 0x%08x (%u)\n", ent->id, ent->id);
g_print("\tName : %s\n", ent->name);