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device: Always use a pair of driver and subdev names to find the device (MR 9)

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Otherwise Megapixels fails to find the correct device on systems where
there are multiple media devices handled by the same driver, like imx8mq.
This commit is contained in:
Sebastian Krzyszkowiak
2022-01-21 15:03:32 +01:00
committed by Martijn Braam
parent e75eb375de
commit 1dc3d3d455
4 changed files with 58 additions and 57 deletions
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12
src/device.c
View File

@@ -74,11 +74,12 @@ xioctl(int fd, int request, void *arg)
}
MPDevice *
mp_device_find(const char *driver_name)
mp_device_find(const char *driver_name, const char *dev_name)
{
MPDeviceList *list = mp_device_list_new();
MPDevice *found_device = mp_device_list_find_remove(&list, driver_name);
MPDevice *found_device =
mp_device_list_find_remove(&list, driver_name, dev_name);
mp_device_list_free(list);
@@ -476,7 +477,9 @@ mp_device_list_free(MPDeviceList *device_list)
}
MPDevice *
mp_device_list_find_remove(MPDeviceList **list, const char *driver_name)
mp_device_list_find_remove(MPDeviceList **list,
const char *driver_name,
const char *dev_name)
{
MPDevice *found_device = NULL;
int length = strlen(driver_name);
@@ -485,7 +488,8 @@ mp_device_list_find_remove(MPDeviceList **list, const char *driver_name)
MPDevice *device = mp_device_list_get(*list);
const struct media_device_info *info = mp_device_get_info(device);
if (strncmp(info->driver, driver_name, length) == 0) {
if (strncmp(info->driver, driver_name, length) == 0 &&
mp_device_find_entity(device, dev_name)) {
found_device = mp_device_list_remove(list);
break;
}

5
src/device.h
View File

@@ -12,7 +12,7 @@ mp_find_device_path(struct media_v2_intf_devnode devnode, char *path, int length
typedef struct _MPDevice MPDevice;
MPDevice *mp_device_find(const char *driver_name);
MPDevice *mp_device_find(const char *driver_name, const char *dev_name);
MPDevice *mp_device_open(const char *path);
MPDevice *mp_device_new(int fd);
void mp_device_close(MPDevice *device);
@@ -74,7 +74,8 @@ MPDeviceList *mp_device_list_new();
void mp_device_list_free(MPDeviceList *device_list);
MPDevice *mp_device_list_find_remove(MPDeviceList **device_list,
const char *driver_name);
const char *driver_name,
const char *dev_name);
MPDevice *mp_device_list_remove(MPDeviceList **device_list);
MPDevice *mp_device_list_get(const MPDeviceList *device_list);

12
src/io_pipeline.c
View File

@@ -54,6 +54,7 @@ struct camera_info {
struct device_info {
const char *media_dev_name; // owned by camera config
const char *dev_name; // owned by camera config
MPDevice *device;
@@ -132,8 +133,10 @@ setup_camera(MPDeviceList **device_list, const struct mp_camera_config *config)
// Find device info
size_t device_index = 0;
for (; device_index < num_devices; ++device_index) {
if (strcmp(config->media_dev_name,
devices[device_index].media_dev_name) == 0) {
if ((strcmp(config->media_dev_name,
devices[device_index].media_dev_name) == 0) &&
(strcmp(config->dev_name, devices[device_index].dev_name) ==
0)) {
break;
}
}
@@ -144,8 +147,9 @@ setup_camera(MPDeviceList **device_list, const struct mp_camera_config *config)
// Initialize new device
struct device_info *info = &devices[device_index];
info->media_dev_name = config->media_dev_name;
info->device = mp_device_list_find_remove(device_list,
info->media_dev_name);
info->dev_name = config->dev_name;
info->device = mp_device_list_find_remove(
device_list, info->media_dev_name, info->dev_name);
if (!info->device) {
g_printerr("Could not find /dev/media* node matching '%s'\n",
info->media_dev_name);

86
tools/camera_test.c
View File

@@ -19,22 +19,18 @@ get_time()
int
main(int argc, char *argv[])
{
if (argc != 2 && argc != 3) {
printf("Usage: %s <media_device_name> [<sub_device_name>]\n",
argv[0]);
if (argc != 3) {
printf("Usage: %s <media_device_name> <sub_device_name>\n", argv[0]);
return 1;
}
char *video_name = argv[1];
char *subdev_name = NULL;
if (argc == 3) {
subdev_name = argv[2];
}
char *subdev_name = argv[2];
double find_start = get_time();
// First find the device
MPDevice *device = mp_device_find(video_name);
MPDevice *device = mp_device_find(video_name, subdev_name);
if (!device) {
printf("Device not found\n");
return 1;
@@ -73,50 +69,46 @@ main(int argc, char *argv[])
}
int subdev_fd = -1;
if (subdev_name) {
const struct media_v2_entity *entity =
mp_device_find_entity(device, subdev_name);
if (!entity) {
printf("Unable to find sub-device\n");
return 1;
const struct media_v2_entity *entity =
mp_device_find_entity(device, subdev_name);
if (!entity) {
printf("Unable to find sub-device\n");
return 1;
}
const struct media_v2_pad *source_pad =
mp_device_get_pad_from_entity(device, entity->id);
const struct media_v2_pad *sink_pad =
mp_device_get_pad_from_entity(device, video_entity_id);
// Disable other links
const struct media_v2_entity *entities = mp_device_get_entities(device);
for (int i = 0; i < mp_device_get_num_entities(device); ++i) {
if (entities[i].id != video_entity_id &&
entities[i].id != entity->id) {
const struct media_v2_pad *pad =
mp_device_get_pad_from_entity(device,
entities[i].id);
mp_device_setup_link(device, pad->id, sink_pad->id, false);
}
}
const struct media_v2_pad *source_pad =
mp_device_get_pad_from_entity(device, entity->id);
const struct media_v2_pad *sink_pad =
mp_device_get_pad_from_entity(device, video_entity_id);
// Then enable ours
mp_device_setup_link(device, source_pad->id, sink_pad->id, true);
// Disable other links
const struct media_v2_entity *entities =
mp_device_get_entities(device);
for (int i = 0; i < mp_device_get_num_entities(device); ++i) {
if (entities[i].id != video_entity_id &&
entities[i].id != entity->id) {
const struct media_v2_pad *pad =
mp_device_get_pad_from_entity(
device, entities[i].id);
mp_device_setup_link(
device, pad->id, sink_pad->id, false);
}
}
const struct media_v2_interface *iface =
mp_device_find_entity_interface(device, entity->id);
// Then enable ours
mp_device_setup_link(device, source_pad->id, sink_pad->id, true);
char buf[256];
if (!mp_find_device_path(iface->devnode, buf, 256)) {
printf("Unable to find sub-device path\n");
return 1;
}
const struct media_v2_interface *iface =
mp_device_find_entity_interface(device, entity->id);
char buf[256];
if (!mp_find_device_path(iface->devnode, buf, 256)) {
printf("Unable to find sub-device path\n");
return 1;
}
subdev_fd = open(buf, O_RDWR);
if (subdev_fd == -1) {
printf("Unable to open sub-device\n");
return 1;
}
subdev_fd = open(buf, O_RDWR);
if (subdev_fd == -1) {
printf("Unable to open sub-device\n");
return 1;
}
double open_end = get_time();