Hi this is my process_meta function in source deepstream-app.c
#include "gstnvdsmeta.h"
#include "nvbufsurface.h"
#include "nvds_obj_encode.h"
…
static void
process_meta (AppCtx * appCtx, NvDsBatchMeta * batch_meta)
{
// For single source always display text either with demuxer or with tiler
if (!appCtx->config.tiled_display_config.enable ||
appCtx->config.num_source_sub_bins == 1) {
appCtx->show_bbox_text = 1;
}
for (NvDsMetaList * l_frame = batch_meta->frame_meta_list; l_frame != NULL;
l_frame = l_frame->next) {
NvDsFrameMeta *frame_meta = l_frame->data;
for (NvDsMetaList * l_obj = frame_meta->obj_meta_list; l_obj != NULL;
l_obj = l_obj->next) {
NvDsObjectMeta *obj = (NvDsObjectMeta *) l_obj->data;
///*************************///
char fileNameString[FILE_NAME_SIZE];
const char *osd_string = "OSD";
int obj_res_width = GST_ROUND_DOWN_2 ((int) obj->rect_params.width);
int obj_res_height = GST_ROUND_DOWN_2 ((int) obj->rect_params.height);
snprintf (fileNameString, FILE_NAME_SIZE, "/home/phongtsv/nvidia/%s_%d_%s_%d_%d.jpg",
osd_string, frame_meta->source_id, obj->obj_label, obj_res_width, obj_res_height);
NvDsUserMetaList *usrMetaList = obj->obj_user_meta_list;
FILE *file;
printf("save process: %s",obj->obj_label);
while (usrMetaList != NULL) {
NvDsUserMeta *usrMetaData = (NvDsUserMeta *) usrMetaList->data;
printf("saving");
if (usrMetaData->base_meta.meta_type == NVDS_CROP_IMAGE_META) {
NvDsObjEncOutParams *enc_jpeg_image =
(NvDsObjEncOutParams *) usrMetaData->user_meta_data;
/* Write to File */
file = fopen (fileNameString, "wb");
fwrite (enc_jpeg_image->outBuffer, sizeof (uint8_t),
enc_jpeg_image->outLen, file);
fclose (file);
printf("saved");
usrMetaList = NULL;
} else {
usrMetaList = usrMetaList->next;
}
}
///*************************///
gint class_index = obj->class_id;
NvDsGieConfig *gie_config = NULL;
gchar *str_ins_pos = NULL;
if (obj->unique_component_id ==
(gint) appCtx->config.primary_gie_config.unique_id) {
gie_config = &appCtx->config.primary_gie_config;
} else {
for (gint i = 0; i < (gint) appCtx->config.num_secondary_gie_sub_bins;
i++) {
gie_config = &appCtx->config.secondary_gie_sub_bin_config[i];
if (obj->unique_component_id == (gint) gie_config->unique_id) {
break;
}
gie_config = NULL;
}
}
g_free (obj->text_params.display_text);
obj->text_params.display_text = NULL;
if (gie_config != NULL) {
if (g_hash_table_contains (gie_config->bbox_border_color_table,
class_index + (gchar *) NULL)) {
obj->rect_params.border_color =
*((NvOSD_ColorParams *)
g_hash_table_lookup (gie_config->bbox_border_color_table,
class_index + (gchar *) NULL));
} else {
obj->rect_params.border_color = gie_config->bbox_border_color;
}
obj->rect_params.border_width = appCtx->config.osd_config.border_width;
if (g_hash_table_contains (gie_config->bbox_bg_color_table,
class_index + (gchar *) NULL)) {
obj->rect_params.has_bg_color = 1;
obj->rect_params.bg_color =
*((NvOSD_ColorParams *)
g_hash_table_lookup (gie_config->bbox_bg_color_table,
class_index + (gchar *) NULL));
} else {
obj->rect_params.has_bg_color = 0;
}
}
if (!appCtx->show_bbox_text)
continue;
obj->text_params.x_offset = obj->rect_params.left;
obj->text_params.y_offset = obj->rect_params.top - 30;
obj->text_params.font_params.font_color =
appCtx->config.osd_config.text_color;
obj->text_params.font_params.font_size =
appCtx->config.osd_config.text_size;
obj->text_params.font_params.font_name = appCtx->config.osd_config.font;
if (appCtx->config.osd_config.text_has_bg) {
obj->text_params.set_bg_clr = 1;
obj->text_params.text_bg_clr = appCtx->config.osd_config.text_bg_color;
}
obj->text_params.display_text = g_malloc (128);
obj->text_params.display_text[0] = '\0';
str_ins_pos = obj->text_params.display_text;
if (obj->obj_label[0] != '\0')
sprintf (str_ins_pos, "%s", obj->obj_label);
str_ins_pos += strlen (str_ins_pos);
if (obj->object_id != UNTRACKED_OBJECT_ID) {
/** object_id is a 64-bit sequential value;
* but considering the display aesthetic,
* trimming to lower 32-bits */
if (appCtx->config.tracker_config.display_tracking_id) {
guint64 const LOW_32_MASK = 0x00000000FFFFFFFF;
sprintf (str_ins_pos, " %lu", (obj->object_id & LOW_32_MASK));
str_ins_pos += strlen (str_ins_pos);
}
}
obj->classifier_meta_list =
g_list_sort (obj->classifier_meta_list, component_id_compare_func);
for (NvDsMetaList * l_class = obj->classifier_meta_list; l_class != NULL;
l_class = l_class->next) {
NvDsClassifierMeta *cmeta = (NvDsClassifierMeta *) l_class->data;
for (NvDsMetaList * l_label = cmeta->label_info_list; l_label != NULL;
l_label = l_label->next) {
NvDsLabelInfo *label = (NvDsLabelInfo *) l_label->data;
if (label->pResult_label) {
sprintf (str_ins_pos, " %s", label->pResult_label);
} else if (label->result_label[0] != '\0') {
sprintf (str_ins_pos, " %s", label->result_label);
}
str_ins_pos += strlen (str_ins_pos);
}
}
}
}
}
but in command *NvDsUserMetaList usrMetaList = obj->obj_user_meta_list; output of usrMetaList is NULL
thank you how to fix it