Add opus audio codec support in remoting

media/base/sinc_resampler.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.
 //
 // Input buffer layout, dividing the total buffer into regions (r0_ - r5_):
 //
 // |----------------|-----------------------------------------|----------------|
 //
 //                                   kBlockSize + kKernelSize / 2
 //                   <--------------------------------------------------------->
@@ skipping 34 matching lines @@
 #if defined(ARCH_CPU_X86_FAMILY) && defined(__SSE__)
 #include <xmmintrin.h>
 #endif
 
 #if defined(ARCH_CPU_ARM_FAMILY) && defined(USE_NEON)
 #include <arm_neon.h>
 #endif
 
 namespace media {
 
+namespace {
+
 enum {
   // The kernel size can be adjusted for quality (higher is better) at the
   // expense of performance.  Must be a multiple of 32.
   // TODO(dalecurtis): Test performance to see if we can jack this up to 64+.
   kKernelSize = 32,
 
   // The number of destination frames generated per processing pass.  Affects
   // how often and for how much SincResampler calls back for input.  Must be
   // greater than kKernelSize.
   kBlockSize = 512,
 
   // The kernel offset count is used for interpolation and is the number of
   // sub-sample kernel shifts.  Can be adjusted for quality (higher is better)
   // at the expense of allocating more memory.
   kKernelOffsetCount = 32,
   kKernelStorageSize = kKernelSize * (kKernelOffsetCount + 1),
 
   // The size (in samples) of the internal buffer used by the resampler.
   kBufferSize = kBlockSize + kKernelSize
 };
 
+}  // namespace
+
+const int SincResampler::kLookAheadSize = kBufferSize;
+
 SincResampler::SincResampler(double io_sample_rate_ratio, const ReadCB& read_cb)
     : io_sample_rate_ratio_(io_sample_rate_ratio),
       virtual_source_idx_(0),
       buffer_primed_(false),
       read_cb_(read_cb),
       // Create input buffers with a 16-byte alignment for SSE optimizations.
       kernel_storage_(static_cast<float*>(
           base::AlignedAlloc(sizeof(float) * kKernelStorageSize, 16))),
       input_buffer_(static_cast<float*>(
           base::AlignedAlloc(sizeof(float) * kBufferSize, 16))),
@@ skipping 246 matching lines @@
       vmulq_f32(m_sums1, vmovq_n_f32(1.0 - kernel_interpolation_factor)),
       m_sums2, vmovq_n_f32(kernel_interpolation_factor));
 
   // Sum components together.
   float32x2_t m_half = vadd_f32(vget_high_f32(m_sums1), vget_low_f32(m_sums1));
   return vget_lane_f32(vpadd_f32(m_half, m_half), 0);
 }
 #endif
 
 }  // namespace media