Support for parsing encrypted WebM streams by src.

media/webm/webm_cluster_parser_unittest.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "media/webm/cluster_builder.h"
 #include "media/webm/webm_cluster_parser.h"
@@ skipping 49 matching lines @@
     CHECK_GE(block_info[i].duration, 0);
     cb.AddBlockGroup(block_info[i].track_num,
                      block_info[i].timestamp,
                      block_info[i].duration,
                      0, data, sizeof(data));
   }
 
   return cb.Finish();
 }
 
+const uint8 encrypted_frame[] = {

[ddorwin, 2013/03/12 04:40:06]

kEncryptedFrame.
This should be with other constants.
It should also be static (as should constants above) or in an anonymous
namespace.

[fgalligan1, 2013/03/12 17:20:13]

Done.

+  0x01, // Block is encrypted

[xhwang, 2013/03/12 17:28:57]

nit: 2 spaces before //

[fgalligan1, 2013/03/13 17:58:09]

Done.

+  0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07, 0x08  // IV
+};
+
+// Creates a Cluster with one encrypted Block. |bytes_to_write| is number of
+// bytes of the encrypted frame to write.
+static scoped_ptr<Cluster> CreateEncryptedCluster(int bytes_to_write) {
+  ClusterBuilder cb;
+  cb.SetClusterTimecode(0);
+  int frame_size = (bytes_to_write < 1) ? 1 : bytes_to_write;
+  if (frame_size > sizeof(encrypted_frame))
+    frame_size = sizeof(encrypted_frame);

[ddorwin, 2013/03/12 04:40:06]

This seems unexpected. DCHECK or something if you can't handle it.

[fgalligan1, 2013/03/12 17:20:13]

Done.

+  cb.AddSimpleBlock(kVideoTrackNum, 0, 0, encrypted_frame, frame_size);
+  return cb.Finish();
+}
+
 static bool VerifyBuffers(const WebMClusterParser::BufferQueue& audio_buffers,
                           const WebMClusterParser::BufferQueue& video_buffers,
                           const WebMClusterParser::BufferQueue& text_buffers,
                           const BlockInfo* block_info,
                           int block_count) {
   size_t audio_offset = 0;
   size_t video_offset = 0;
   size_t text_offset = 0;
   for (int i = 0; i < block_count; i++) {
     const WebMClusterParser::BufferQueue* buffers = NULL;
@@ skipping 353 matching lines @@
 
   while (text_it(&text_track_num, &text_buffers)) {
     const TextTrackSet::const_iterator find_result =
         text_tracks.find(text_track_num);
     ASSERT_TRUE(find_result != text_tracks.end());
     ASSERT_TRUE(VerifyTextBuffers(parser_, kInputBlockInfo, input_block_count,
                                   text_track_num, *text_buffers));
   }
 }
 
+TEST_F(WebMClusterParserTest, ParseEncryptedBlock) {
+  scoped_ptr<Cluster> cluster(CreateEncryptedCluster(sizeof(encrypted_frame)));
+
+  parser_.reset(new WebMClusterParser(
+      kTimecodeScale, kAudioTrackNum, kVideoTrackNum,
+      std::set<int>(),
+      std::set<int64>(), "", "video_key_id",
+      LogCB()));
+  int result = parser_->Parse(cluster->data(), cluster->size());
+  EXPECT_EQ(cluster->size(), result);

[ddorwin, 2013/03/12 04:40:06]

Can we check is_encrypted or anything?

[fgalligan1, 2013/03/12 17:20:13]

Done.

+}
+
+TEST_F(WebMClusterParserTest, ParseBadEncryptedBlock) {
+  scoped_ptr<Cluster> cluster(
+      CreateEncryptedCluster(sizeof(encrypted_frame) - 1));
+
+  parser_.reset(new WebMClusterParser(
+      kTimecodeScale, kAudioTrackNum, kVideoTrackNum,
+      std::set<int>(),
+      std::set<int64>(), "", "video_key_id",
+      LogCB()));
+  int result = parser_->Parse(cluster->data(), cluster->size());
+  EXPECT_EQ(-1, result);
+}
+
 }  // namespace media