Add opus audio codec support in remoting

media/base/sinc_resampler.h

 // 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.
 
 #ifndef MEDIA_BASE_SINC_RESAMPLER_H_
 #define MEDIA_BASE_SINC_RESAMPLER_H_
 
 #include "base/callback.h"
 #include "base/gtest_prod_util.h"
 #include "base/memory/aligned_memory.h"
 #include "base/memory/scoped_ptr.h"
 #include "media/base/media_export.h"
 
 namespace media {
 
 // SincResampler is a high-quality single-channel sample-rate converter.
 class MEDIA_EXPORT SincResampler {
  public:
+  // How many samples may be requested from the callback ahead of the current
+  // position in the stream.
+  static const int kLookAheadSize;

[DaleCurtis, 2012/10/18 00:45:01]

Hmm, this is a misleading comment / name, the priming step will ask for
"kBlockSize + kKernelSize / 2" while the refresh step will ask for "kBlockSize".
Maybe MaximumLookAheadSize.

Also shouldn't this be an extern? I forget the rules for this.

[Sergey Ulanov, 2012/10/19 20:54:30]

Done.
No, because it's a class member.

+
   // Callback type for providing more data into the resampler.  Expects |frames|
   // of data to be rendered into |destination|; zero padded if not enough frames
   // are available to satisfy the request.
   typedef base::Callback<void(float* destination, int frames)> ReadCB;
 
   // Constructs a SincResampler with the specified |read_cb|, which is used to
   // acquire audio data for resampling.  |io_sample_rate_ratio| is the ratio of
   // input / output sample rates.
   SincResampler(double io_sample_rate_ratio, const ReadCB& read_cb);
   virtual ~SincResampler();
@@ skipping 58 matching lines @@
   float* const r3_;
   float* const r4_;
   float* const r5_;
 
   DISALLOW_COPY_AND_ASSIGN(SincResampler);
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_SINC_RESAMPLER_H_