Add live mode detection in WebM MediaSource parser.

media/formats/webm/webm_info_parser.cc

 // Copyright 2014 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 "media/formats/webm/webm_info_parser.h"
 
 #include "base/logging.h"
 #include "media/formats/webm/webm_constants.h"
 
 namespace media {
@@ skipping 56 matching lines @@
   if (duration_ != -1) {
     DVLOG(1) << "Multiple values for duration.";
     return false;
   }
 
   duration_ = val;
   return true;
 }
 
 bool WebMInfoParser::OnBinary(int id, const uint8* data, int size) {
+  if (id == kWebMIdDateUTC) {
+    const int kDateUTCSize = 8;
+    if (size != kDateUTCSize) {
+      DVLOG(1) << "Invalid DateUTC size: " << size;
+      return false;
+    }
+
+    // Parse 64-bit big-endian integer.
+    int64 date_value = 0;
+    for (int i = 0; i < kDateUTCSize; ++i) {
+      date_value = (date_value << 8) | data[i];
+    }
+
+    // DateUTC is specified in nanoseconds from 0:00 on January 1st, 2001.
+    base::Time::Exploded millennium_exploded;
+    memset(&millennium_exploded, 0, sizeof(millennium_exploded));
+    millennium_exploded.year = 2001;
+    millennium_exploded.month = 1;
+    millennium_exploded.day_of_month = 1;
+    date_utc_ = base::Time::FromUTCExploded(millennium_exploded) +
+                base::TimeDelta::FromMicroseconds(date_value / 1000LL);
+  }
   return true;
 }
 
 bool WebMInfoParser::OnString(int id, const std::string& str) {
   return true;
 }
 
 }  // namespace media