Support HLS MPEG2 TS with SAMPLE-AES encryption.

media/base/test_data_util.cc

Index: media/base/test_data_util.cc
diff --git a/media/base/test_data_util.cc b/media/base/test_data_util.cc
index c56fd425dc444f3ee724fdee7ee40ce14d230857..9fc6332e7c387afef948b3abeed71a8dffa67b66 100644
--- a/media/base/test_data_util.cc
+++ b/media/base/test_data_util.cc
@@ -14,6 +14,17 @@
 
 namespace media {
 
+namespace {
+
+// Key used to encrypt test files.
+const uint8_t kSecretKey[] = {0xeb, 0xdd, 0x62, 0xf1, 0x68, 0x14, 0xd2, 0x7b,
+                              0x68, 0xef, 0x12, 0x2a, 0xfc, 0xe4, 0xae, 0x3c};
+
+// The key ID for all encrypted files.
+const uint8_t kKeyId[] = {0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37,
+                          0x38, 0x39, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35};
+}
+
 const base::FilePath::CharType kTestDataPath[] =
     FILE_PATH_LITERAL("media/test/data");
 
@@ -56,4 +67,33 @@ scoped_refptr<DecoderBuffer> ReadTestDataFile(const std::string& name) {
   return buffer;
 }
 
+bool LookupTestKeyVector(const std::vector<uint8_t>& key_id,
+                         bool allow_rotation,
+                         std::vector<uint8_t>* key) {
+  std::vector<uint8_t> starting_key_id(kKeyId, kKeyId + arraysize(kKeyId));
+  size_t rotate_limit = allow_rotation ? starting_key_id.size() : 1;
+  for (size_t pos = 0; pos < rotate_limit; ++pos) {
+    std::rotate(starting_key_id.begin(), starting_key_id.begin() + pos,
+                starting_key_id.end());
+    if (key_id == starting_key_id) {
+      key->assign(kSecretKey, kSecretKey + arraysize(kSecretKey));
+      std::rotate(key->begin(), key->begin() + pos, key->end());
+      return true;
+    }
+  }
+  return false;
+}
+
+bool LookupTestKeyString(const std::string& key_id,
+                         bool allow_rotation,
+                         std::string* key) {
+  std::vector<uint8_t> key_vector;
+  bool result =
+      LookupTestKeyVector(std::vector<uint8_t>(key_id.begin(), key_id.end()),
+                          allow_rotation, &key_vector);
+  if (result)
+    *key = std::string(key_vector.begin(), key_vector.end());
+  return result;
+}
+
 }  // namespace media