Mix to an intermediate buffer.

services/media/audio/platform/generic/mixers/no_op.cc

 // Copyright 2015 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 "base/logging.h"
 #include "services/media/audio/audio_track_impl.h"
 #include "services/media/audio/platform/generic/mixers/no_op.h"
 
 namespace mojo {
 namespace media {
 namespace audio {
 namespace mixers {
 
-bool NoOp::Mix(void*       dst,
+bool NoOp::Mix(int32_t*    dst,
                uint32_t    dst_frames,
                uint32_t*   dst_offset,
                const void* src,
                uint32_t    frac_src_frames,
                int32_t*    frac_src_offset,
                uint32_t    frac_step_size,
                bool        accumulate) {
   return false;
 }
 
 }  // namespace mixers
 }  // namespace audio
 }  // namespace media
 }  // namespace mojo