Chrome-side implementation of media source timestamp offset

media/webm/webm_stream_parser.cc

Index: media/webm/webm_stream_parser.cc
diff --git a/media/webm/webm_stream_parser.cc b/media/webm/webm_stream_parser.cc
index 602d22787c341b9603d49f317345678dc5f78320..5af622b8239325aafce1719438edfe4e1f381980 100644
--- a/media/webm/webm_stream_parser.cc
+++ b/media/webm/webm_stream_parser.cc
@@ -264,6 +264,14 @@ bool WebMStreamParser::Parse(const uint8* buf, int size) {
   return true;
 }
 
+void WebMStreamParser::SetTimestampOffset(base::TimeDelta offset) {
+  timestamp_offset_ = offset;
+}
+
+void WebMStreamParser::ClearTimestampOffset() {
+  SetTimestampOffset(base::TimeDelta());
+}
+
 void WebMStreamParser::ChangeState(State new_state) {
   DVLOG(1) << "ChangeState() : " << state_ << " -> " << new_state;
   state_ = new_state;
@@ -385,9 +393,14 @@ int WebMStreamParser::ParseCluster(const uint8* data, int size) {
   if (result <= 0)
     return result;
 
-  if (id == kWebMIdCluster)
+  if (id == kWebMIdCluster) {
     waiting_for_buffers_ = true;
 
+    // Wait until the beginning of a new cluster to set the buffer timestamp
+    // offset.
+    cluster_parser_->SetTimestampOffset(timestamp_offset_);
+  }
+
   if (id == kWebMIdCues) {
     if (size < (result + element_size)) {
       // We don't have the whole element yet. Signal we need more data.