Add plumbing and support for crossfading StreamParserBuffers.

media/base/stream_parser_buffer.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 "media/base/stream_parser_buffer.h"
 
 #include "base/logging.h"
 #include "media/base/buffers.h"
 
 namespace media {
 
+static bool HasNestedFadeOutPreroll(
+    const std::vector<scoped_refptr<StreamParserBuffer> >& fade_out_preroll) {
+  for (size_t i = 0; i < fade_out_preroll.size(); ++i) {
+    if (!fade_out_preroll[i]->GetFadeOutPreroll().empty())
+      return true;
+  }
+  return false;
+}
+
 scoped_refptr<StreamParserBuffer> StreamParserBuffer::CreateEOSBuffer() {
   return make_scoped_refptr(new StreamParserBuffer(NULL, 0, NULL, 0, false));
 }
 
 scoped_refptr<StreamParserBuffer> StreamParserBuffer::CopyFrom(
     const uint8* data, int data_size, bool is_keyframe) {
   return make_scoped_refptr(
       new StreamParserBuffer(data, data_size, NULL, 0, is_keyframe));
 }
 
@@ skipping 34 matching lines @@
 }
 
 int StreamParserBuffer::GetConfigId() const {
   return config_id_;
 }
 
 void StreamParserBuffer::SetConfigId(int config_id) {
   config_id_ = config_id;
 }
 
+const std::vector<scoped_refptr<StreamParserBuffer> >&
+StreamParserBuffer::GetFadeOutPreroll() const {
+  return fade_out_preroll_;
+}
+
+void StreamParserBuffer::SetFadeOutPreroll(
+    const std::vector<scoped_refptr<StreamParserBuffer> >& fade_out_preroll) {
+  DCHECK(!HasNestedFadeOutPreroll(fade_out_preroll));
+  fade_out_preroll_ = fade_out_preroll;
+}
+
 }  // namespace media