WIP - MSE: Drop non-keyframes that lack keyframe dependency

media/filters/source_buffer_stream.h

Index: media/filters/source_buffer_stream.h
diff --git a/media/filters/source_buffer_stream.h b/media/filters/source_buffer_stream.h
index 8a7ac85957087c40d89d42d62a6a3453b8afdea1..7559a443963732bac6db8e2e96a45d6ccf01b659 100644
--- a/media/filters/source_buffer_stream.h
+++ b/media/filters/source_buffer_stream.h
@@ -16,6 +16,7 @@
 #include <utility>
 #include <vector>
 
+#include "base/callback_forward.h"
 #include "base/memory/ref_counted.h"
 #include "media/base/audio_decoder_config.h"
 #include "media/base/media_export.h"
@@ -34,6 +35,8 @@ class MEDIA_EXPORT SourceBufferStream {
  public:
   typedef StreamParser::BufferQueue BufferQueue;
   typedef std::list<SourceBufferRange*> RangeList;
+  typedef base::Callback<bool(DecodeTimestamp start_dts,
+                              DecodeTimestamp end_dts)> NotifyRangeRemovalCB;
 
   // Status returned by GetNextBuffer().
   // kSuccess: Indicates that the next buffer was returned.
@@ -65,6 +68,15 @@ class MEDIA_EXPORT SourceBufferStream {
 
   ~SourceBufferStream();
 
+  // Allows callers to register for notification of range removal. The
+  // registration must be valid during any range removal algorithm execution, as
+  // can result from duration truncation, explicit Remove(), or garbage
+  // collection. Coded frame removals done during Append are not included (nor
+  // should they be according to MSE spec.)
+  void set_range_removal_cb(const NotifyRangeRemovalCB& range_removal_cb) {
+    range_removal_cb_ = range_removal_cb;
+  }
+
   // Signals that the next buffers appended are part of a new media segment
   // starting at |media_segment_start_time|.
   // TODO(acolwell/wolenetz): This should be changed to a presentation
@@ -329,6 +341,11 @@ class MEDIA_EXPORT SourceBufferStream {
   // out what is wrong with the content.
   LogCB log_cb_;
 
+  // Callback used to report range removal to support detection and processing
+  // by the MSE Coded Frame Processing Algorithm's of an append discontinuity
+  // that may have been introduced by the range's removal.
+  NotifyRangeRemovalCB range_removal_cb_;
+
   // List of disjoint buffered ranges, ordered by start time.
   RangeList ranges_;