Add Common Encryption support to BMFF, including subsample decryption.

media/base/decrypt_config.cc

Index: media/base/decrypt_config.cc
diff --git a/media/base/decrypt_config.cc b/media/base/decrypt_config.cc
index 9ae5f195e5d4cfab2be9a45108b23d329d2732e4..9e9a46cd3b5bcdb090649e256cb18acb2ebde52d 100644
--- a/media/base/decrypt_config.cc
+++ b/media/base/decrypt_config.cc
@@ -8,11 +8,55 @@
 
 namespace media {
 
+// TODO(strobe): Remove along with CBC mode.
+static const char kDefaultIV[] = "0000000000000000";

[fgalligan1, 2012/06/27 00:28:36]

s/kDefaultIV/kDefaultIv/

[strobe_, 2012/06/27 02:01:21]

Done.

+static const int kDefaultIVSize = 16;

[fgalligan1, 2012/06/27 00:28:36]

s/kDefaultIVSize/kDefaultIvSize/

[strobe_, 2012/06/27 02:01:21]

Done.

+
 DecryptConfig::DecryptConfig(const uint8* key_id, int key_id_size)
-    : key_id_size_(key_id_size) {
+    : key_id_size_(key_id_size),
+      iv_size_(kDefaultIVSize),
+      subsample_count_(0),
+      use_cbc_(true) {
+  CHECK_GT(key_id_size, 0);
+  key_id_.reset(new uint8[key_id_size]);
+  memcpy(key_id_.get(), key_id, key_id_size);
+  iv_.reset(new uint8[iv_size_]);
+  memcpy(iv_.get(), kDefaultIV, iv_size_);
+}
+
+DecryptConfig::DecryptConfig(const uint8* key_id, int key_id_size,
+                             const uint8* iv, int iv_size)
+    : key_id_size_(key_id_size),
+      iv_size_(iv_size),
+      subsample_count_(0),
+      use_cbc_(false) {
+  CHECK_GT(key_id_size, 0);
+  CHECK_GT(iv_size, 0);
+  key_id_.reset(new uint8[key_id_size]);
+  memcpy(key_id_.get(), key_id, key_id_size);
+  iv_.reset(new uint8[iv_size]);
+  memcpy(iv_.get(), iv, iv_size);
+}
+
+DecryptConfig::DecryptConfig(const uint8* key_id, int key_id_size,
+                             const uint8* iv, int iv_size,
+                             const SubsampleEntry* subsamples,
+                             int subsample_count)
+    : key_id_size_(key_id_size),
+      iv_size_(iv_size),
+      subsample_count_(subsample_count),
+      use_cbc_(false) {
   CHECK_GT(key_id_size, 0);
+  CHECK_GT(iv_size, 0);
   key_id_.reset(new uint8[key_id_size]);
   memcpy(key_id_.get(), key_id, key_id_size);
+  iv_.reset(new uint8[iv_size]);
+  memcpy(iv_.get(), iv, iv_size);
+  if (subsample_count > 0) {
+    subsamples_.reset(new SubsampleEntry[subsample_count]);
+    memcpy(subsamples_.get(), subsamples,
+           subsample_count * sizeof(SubsampleEntry));
+  }
 }
 
 DecryptConfig::~DecryptConfig() {}