static void json_print_section_header(WriterContext *wctx)
{
    JSONContext *json = wctx->priv;
    AVBPrint buf;
    const struct section *section = wctx->section[wctx->level];
    const struct section *parent_section = wctx->level ?
        wctx->section[wctx->level-1] : NULL;

    if (wctx->level && wctx->nb_item[wctx->level-1])
        printf(",\n");

    if (section->flags & SECTION_FLAG_IS_WRAPPER) {
        printf("{\n");
        json->indent_level++;
    } else {
        av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
        json_escape_str(&buf, section->name, wctx);
        JSON_INDENT();

        json->indent_level++;
        if (section->flags & SECTION_FLAG_IS_ARRAY) {
            printf("\"%s\": [\n", buf.str);
        } else if (parent_section && !(parent_section->flags & SECTION_FLAG_IS_ARRAY)) {
            printf("\"%s\": {%s", buf.str, json->item_start_end);
        } else {
            printf("{%s", json->item_start_end);

            /* this is required so the parser can distinguish between packets and frames */
            if (parent_section && parent_section->id == SECTION_ID_PACKETS_AND_FRAMES) {
                if (!json->compact)
                    JSON_INDENT();
                printf("\"type\": \"%s\"%s", section->name, json->item_sep);
            }
        }
        av_bprint_finalize(&buf, NULL);
    }
}
static void json_print_section_header(WriterContext *wctx)
{
    JSONContext *json = wctx->priv;
    AVBPrint buf;
    const struct section *section = wctx->section[wctx->level];
    const struct section *parent_section = wctx->level ?
        wctx->section[wctx->level-1] : NULL;

    if (wctx->level && wctx->nb_item[wctx->level-1])
        printf(",\n");

    if (section->flags & SECTION_FLAG_IS_WRAPPER) {
        printf("{\n");
        json->indent_level++;
    } else {
        av_bprint_init(&buf, 1, AV_BPRINT_SIZE_UNLIMITED);
        json_escape_str(&buf, section->name, wctx);
        JSON_INDENT();

        json->indent_level++;
        if (section->flags & SECTION_FLAG_IS_ARRAY) {
            printf("\"%s\": [\n", buf.str);
        } else if (parent_section && !(parent_section->flags & SECTION_FLAG_IS_ARRAY)) {
            printf("\"%s\": {%s", buf.str, json->item_start_end);
        } else {
            printf("{%s", json->item_start_end);

             
            if (parent_section && parent_section->id == SECTION_ID_PACKETS_AND_FRAMES) {
                if (!json->compact)
                    JSON_INDENT();
                printf("\"type\": \"%s\"%s", section->name, json->item_sep);
            }
        }
        av_bprint_finalize(&buf, NULL);
    }
}