From: Jaroslav Kysela <perex@perex.cz>
Date: Sun, 4 Jun 2017 09:21:54 +0000 (+0200)
Subject: descrambler: update the ECM start time when duplicate ECM is received, fixes #4406
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=f947a92ace9283ead415a62780936d0209946490;p=thirdparty%2Ftvheadend.git

descrambler: update the ECM start time when duplicate ECM is received, fixes #4406
---

diff --git a/src/descrambler/descrambler.c b/src/descrambler/descrambler.c
index 5c35aeb41..5a06d4c7d 100644
--- a/src/descrambler/descrambler.c
+++ b/src/descrambler/descrambler.c
@@ -544,6 +544,17 @@ descrambler_keys ( th_descrambler_t *td, int type, uint16_t pid,
       goto fin;
     }
 
+  if (pid == 0)
+    pidname[0] = '\0';
+  else
+    snprintf(pidname, sizeof(pidname), "[%d]", pid);
+  switch(type) {
+  case DESCRAMBLER_CSA_CBC: ktype = "CSA"; break;
+  case DESCRAMBLER_DES_NCB: ktype = "DES"; break;
+  case DESCRAMBLER_AES_ECB: ktype = "AES EBC"; break;
+  default: abort();
+  }
+
   if (even && memcmp(empty, even, tk->key_csa.csa_keylen)) {
     j++;
     memcpy(tk->key_data[0], even, tk->key_csa.csa_keylen);
@@ -551,6 +562,12 @@ descrambler_keys ( th_descrambler_t *td, int type, uint16_t pid,
     tk->key_changed |= 1;
     tk->key_valid |= 0x40;
     tk->key_timestamp[0] = mclk();
+    if (dr->dr_ecm_start[0] < dr->dr_ecm_start[1]) {
+      dr->dr_ecm_start[0] = dr->dr_ecm_start[1];
+      tvhdebug(LS_DESCRAMBLER,
+               "Both keys received, marking ECM start for even key%s for service \"%s\"",
+               pidname, ((mpegts_service_t *)t)->s_dvb_svcname);
+    }
   } else {
     even = empty;
   }
@@ -561,20 +578,16 @@ descrambler_keys ( th_descrambler_t *td, int type, uint16_t pid,
     tk->key_changed |= 2;
     tk->key_valid |= 0x80;
     tk->key_timestamp[1] = mclk();
+    if (dr->dr_ecm_start[1] < dr->dr_ecm_start[0]) {
+      dr->dr_ecm_start[1] = dr->dr_ecm_start[0];
+      tvhdebug(LS_DESCRAMBLER,
+               "Both keys received, marking ECM start for odd key%s for service \"%s\"",
+               pidname, ((mpegts_service_t *)t)->s_dvb_svcname);
+    }
   } else {
     odd = empty;
   }
 
-  if (pid == 0)
-    pidname[0] = '\0';
-  else
-    snprintf(pidname, sizeof(pidname), "[%d]", pid);
-  switch(type) {
-  case DESCRAMBLER_CSA_CBC: ktype = "CSA"; break;
-  case DESCRAMBLER_DES_NCB: ktype = "DES"; break;
-  case DESCRAMBLER_AES_ECB: ktype = "AES EBC"; break;
-  default: abort();
-  }
   if (j) {
     if (td->td_keystate != DS_RESOLVED)
       tvhdebug(LS_DESCRAMBLER,
@@ -1025,8 +1038,10 @@ descrambler_table_callback
   th_descrambler_runtime_t *dr;
   th_descrambler_key_t *tk;
   int emm = (mt->mt_flags & MT_FAST) == 0;
+  mpegts_service_t *t;
+  int64_t clk;
   uint8_t ki;
-  int i;
+  int i, j;
 
   if (len < 6)
     return 0;
@@ -1056,8 +1071,7 @@ descrambler_table_callback
       }
       ds->callback(ds->opaque, mt->mt_pid, ptr, len, emm);
       if (!emm) { /* ECM */
-        mpegts_service_t *t = mt->mt_service;
-        if (t) {
+        if ((t = mt->mt_service) != NULL) {
           /* The keys are requested from this moment */
           dr = t->s_descramble;
           if (dr) {
@@ -1102,6 +1116,24 @@ descrambler_table_callback
           tvhtrace(LS_DESCRAMBLER_EMM, "%s message %02x:{%02x:%02x}:%02x (len %d, pid %d)",
                    s, ptr[0], ptr[1], ptr[2], ptr[3], len, mt->mt_pid);
       }
+    } else if (des->last_data && !emm) {
+      if ((t = mt->mt_service) != NULL) {
+        if ((dr = t->s_descramble) != NULL) {
+          clk = mclk();
+          for (i = 0; i < DESCRAMBLER_MAX_KEYS; i++) {
+            tk = &dr->dr_keys[i];
+            for (j = 0; j < 2; j++) {
+              if (tk->key_timestamp[j] > dr->dr_ecm_start[j] &&
+                  tk->key_timestamp[j] + ms2mono(200) <= clk) {
+                tk->key_timestamp[j] = clk;
+                tvhtrace(LS_DESCRAMBLER, "ECM: %s key[%d] for service \"%s\" still valid",
+                                         j == 0 ? "Even" : "Odd",
+                                         tk->key_pid, t->s_dvb_svcname);
+              }
+            }
+          }
+        }
+      }
     }
   }
   pthread_mutex_unlock(&mt->mt_mux->mm_descrambler_lock);