avformat/mpegts.c: ignore a section with next flag

'current_next_indicator' of 0 (next) on each section header indicates
the service information is for immediate future one.
ffmpeg doesn't need to parse it but current (1) one.

ref: section 5.1.1 of DVB BlueBook A038 (EN 300 468)

Signed-off-by: TADANO Tokumei <aimingoff@pc.nifty.jp>
Signed-off-by: Marton Balint <cus@passwd.hu>

libavformat/mpegts.c

@@ -645,6 +645,7 @@ typedef struct SectionHeader {
     uint8_t tid;
     uint16_t id;
     uint8_t version;
+    uint8_t current_next;
     uint8_t sec_num;
     uint8_t last_sec_num;
 } SectionHeader;
@@ -773,6 +774,7 @@ static int parse_section_header(SectionHeader *h,
     if (val < 0)
         return val;
     h->version = (val >> 1) & 0x1f;
+    h->current_next = val & 0x01;
     val = get8(pp, p_end);
     if (val < 0)
         return val;
@@ -2332,6 +2334,8 @@ static void pmt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
         return;
     if (h->tid != PMT_TID)
         return;
+    if (!h->current_next)
+        return;
     if (skip_identical(h, tssf))
         return;
 
@@ -2541,6 +2545,8 @@ static void pat_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
         return;
     if (h->tid != PAT_TID)
         return;
+    if (!h->current_next)
+        return;
     if (ts->skip_changes)
         return;
 
@@ -2679,6 +2685,8 @@ static void sdt_cb(MpegTSFilter *filter, const uint8_t *section, int section_len
         return;
     if (h->tid != SDT_TID)
         return;
+    if (!h->current_next)
+        return;
     if (ts->skip_changes)
         return;
     if (skip_identical(h, tssf))