From: Jaroslav Kysela <perex@perex.cz>
Date: Mon, 7 Dec 2015 19:56:27 +0000 (+0100)
Subject: added noise data generators to mpegts_input and parser input
X-Git-Tag: v4.2.1~1347
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=717d5618b31871bddd931ed187cbf4535545baa7;p=thirdparty%2Ftvheadend.git

added noise data generators to mpegts_input and parser input
---

diff --git a/src/input/mpegts/mpegts_input.c b/src/input/mpegts/mpegts_input.c
index 28ecadd47..3157c4a7b 100644
--- a/src/input/mpegts/mpegts_input.c
+++ b/src/input/mpegts/mpegts_input.c
@@ -946,6 +946,36 @@ mpegts_input_tuning_error ( mpegts_input_t *mi, mpegts_mux_t *mm )
  * Data processing
  * *************************************************************************/
 
+#if 0
+static int data_noise ( mpegts_packet_t *mp )
+{
+  static uint64_t off = 0, win = 4096, limit = 2*1024*1024;
+  uint8_t *data = mp->mp_data;
+  uint32_t i, p, s, len = mp->mp_len;
+  for (p = 0; p < len; p += 188) {
+    off += 188;
+    if (off >= limit && off < limit + win) {
+      if ((off & 3) == 1) {
+        memmove(data + p, data + p + 188, len - (p + 188));
+        p -= 188;
+        mp->mp_len -= 188;
+        return 1;
+      }
+      s = ((data[2] + data[3] + data[4]) & 3) + 1;
+      for (i = 0; i < 188; i += s)
+        ((char *)data)[p+i] ^= data[10] + data[12] + data[i];
+    } else if (off >= limit + win) {
+      off = 0;
+      limit = (uint64_t)data[15] * 4 * 1024;
+      win   = (uint64_t)data[16] * 16;
+    }
+  }
+  return 0;
+}
+#else
+static inline int data_noise( mpegts_packet_t *mp ) { return 0; }
+#endif
+
 static int inline
 get_pcr ( const uint8_t *tsb, int64_t *rpcr )
 {
@@ -1061,6 +1091,11 @@ mpegts_input_recv_packets
     len -= len2;
     off += len2;
 
+    if ((flags & MPEGTS_DATA_CC_RESTART) == 0 && data_noise(mp)) {
+      free(mp);
+      goto end;
+    }
+
     pthread_mutex_lock(&mi->mi_input_lock);
     if (mmi->mmi_mux->mm_active == mmi) {
       TAILQ_INSERT_TAIL(&mi->mi_input_queue, mp, mp_link);
@@ -1072,6 +1107,7 @@ mpegts_input_recv_packets
   }
 
   /* Adjust buffer */
+end:
   if (len && (flags & MPEGTS_DATA_CC_RESTART) == 0)
     sbuf_cut(sb, off); // cut off the bottom
   else
diff --git a/src/parsers/parsers.c b/src/parsers/parsers.c
index 951bdae31..7db1cdd87 100644
--- a/src/parsers/parsers.c
+++ b/src/parsers/parsers.c
@@ -133,6 +133,31 @@ static void parser_do_backlog(service_t *t, elementary_stream_t *st,
                   void (*pkt_cb)(service_t *t, elementary_stream_t *st, th_pkt_t *pkt),
                   pktbuf_t *meta);
 
+/**
+ * for debugging
+ */
+#if 0
+static int data_noise(const uint8_t *data, int len)
+{
+  static uint64_t off = 0, win = 4096, limit = 1024*1024;
+  uint32_t i;
+  off += len;
+  if (off >= limit && off < limit + win) {
+    if ((off & 3) == 1)
+      return 1;
+    for (i = 0; i < len; i += 3)
+      ((char *)data)[i] ^= 0xa5;
+  } else if (off >= limit + win) {
+    off = 0;
+    limit = (uint64_t)data[15] * 4 * 1024;
+    win   = (uint64_t)data[16] * 4;
+  }
+  return 0;
+}
+#else
+static inline int data_noise(const uint8_t *data, int len) { return 0; }
+#endif
+
 /**
  * Parse raw mpeg data
  */
@@ -146,6 +171,9 @@ parse_mpeg_ts(service_t *t, elementary_stream_t *st, const uint8_t *data,
     sbuf_err(&st->es_buf, 1);
   }
 
+  if (data_noise(data, len))
+    return;
+
   switch(st->es_type) {
   case SCT_MPEG2VIDEO:
     parse_pes(t, st, data, len, start, parse_mpeg2video);