Bug 1308076 - Ensure Primetime PSSH boxes pass the PSSH validator. r=jwwang

Primetime PSSH boxes don't use the common encryption system ID.
So to ensure we don't break any existing Primetime players, we
must allow PSSH boxes with the Primetime system ID to pass the
PSSH validator.

MozReview-Commit-ID: 3q58FKLQXgV

--HG--
extra : rebase_source : a7a0ca3d38fb027ad6de23d8260043b3193536f4
extra : source : b94fe60732fb7d3a6630c976284eaabd28b271f3

media/psshparser/PsshParser.cpp

@@ -108,6 +108,11 @@ const uint8_t kSystemID[] = {
   0xac, 0xe3, 0x3c, 0x1e, 0x52, 0xe2, 0xfb, 0x4b
 };
 
+const uint8_t kPrimetimeID[] = {
+  0xf2, 0x39, 0xe7, 0x69, 0xef, 0xa3, 0x48, 0x50,
+  0x9c, 0x16, 0xa9, 0x03, 0xc6, 0x93, 0x2e, 0xfb
+};
+
 bool
 ParseCENCInitData(const uint8_t* aInitData,
                   uint32_t aInitDataSize,
@@ -158,6 +163,12 @@ ParseCENCInitData(const uint8_t* aInitData,
       // Insufficient bytes to read SystemID.
       return false;
     }
+    if (!memcmp(kPrimetimeID, sid, sizeof(kSystemID))) {
+      // Allow legacy Primetime key system PSSH boxes, which
+      // don't conform to common encryption format.
+      return true;
+    }
+
     if (memcmp(kSystemID, sid, sizeof(kSystemID))) {
       // Ignore pssh boxes with wrong system ID.
       reader.Seek(std::max<size_t>(reader.Offset(), end));

media/psshparser/gtest/TestPsshParser.cpp

@@ -113,6 +113,15 @@ const uint8_t g2xGoogleWPTCencInitData[] = {
   0x00, 0x00, 0x00, 0x00                           // datasize
 };
 
+const uint8_t gPrimetimePSSH[] = {
+  0x00, 0x00, 0x00, 0x00,                          // size = 0
+  0x70, 0x73, 0x73, 0x68,                          // 'pssh'
+  0x01,                                            // version = 1
+  0x00, 0x00, 0x00,                                // flags
+  0xf2, 0x39, 0xe7, 0x69, 0xef, 0xa3, 0x48, 0x50,  // Primetime system Id
+  0x9c, 0x16, 0xa9, 0x03, 0xc6, 0x93, 0x2e, 0xfb
+};
+
 TEST(PsshParser, ParseCencInitData) {
   std::vector<std::vector<uint8_t>> keyIds;
   bool rv;
@@ -153,4 +162,8 @@ TEST(PsshParser, ParseCencInitData) {
   EXPECT_EQ(16u, keyIds[1].size());
   EXPECT_EQ(0, memcmp(&keyIds[0].front(), &g2xGoogleWPTCencInitData[32], 16));
   EXPECT_EQ(0, memcmp(&keyIds[1].front(), &g2xGoogleWPTCencInitData[84], 16));
+
+  rv = ParseCENCInitData(gPrimetimePSSH, MOZ_ARRAY_LENGTH(gPrimetimePSSH), keyIds);
+  EXPECT_TRUE(rv);
+  EXPECT_EQ(0u, keyIds.size());
 }