Enhance AudioSplicer to crossfade marked splice frames.

media/base/vector_math.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/vector_math.h"
 #include "media/base/vector_math_testing.h"
 
 #include <algorithm>
 
 #include "base/cpu.h"
@@ skipping 184 matching lines @@
     const float sample = src[i];
     const float sample_squared = sample * sample;
     result.first += sample_squared * smoothing_factor;
     result.second = std::max(result.second, sample_squared);
   }
 
   return result;
 }
 #endif
 
+
+// TODO(dalecurtis): Add SIMD versions and performance tests.
+void Crossfade(const float src[], int len, float dest[]) {
+  float cf_ratio = 0;
+  const float cf_increment = 1.0f / len;
+  for (int i = 0; i < len; ++i, cf_ratio += cf_increment)
+    dest[i] = (1.0f - cf_ratio) * src[i] + cf_ratio * dest[i];
+}
+
 }  // namespace vector_math
 }  // namespace media