Roll opus to opus-HEAD-66611f1.

third_party/opus/BUILD.gn

 # Copyright 2014 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.
 
 import("//build/config/arm.gni")
+import("//build/config/mips.gni")
 
 # If fixed point implementation shall be used (otherwise float).
-use_opus_fixed_point = cpu_arch == "arm" || cpu_arch == "arm64"
+# TODO(wtc): change "mipselx" to "mipsel" in this file when the compilation
+# errors in the MIPS optimizations are fixed.
+use_opus_fixed_point =
+    cpu_arch == "arm" || cpu_arch == "arm64" || cpu_arch == "mipselx"

[wtc, 2015/01/29 00:39:25]

This matches the "FIXED_POINT=1" setting in third_party/opus/src/Makefile.mips

 
 # If ARM optimizations shall be used to accelerate performance.
 use_opus_arm_optimization = cpu_arch == "arm"
 
+# If MIPS optimizations shall be used to accelerate performance.
+use_opus_mips_optimization = cpu_arch == "mipselx"
+
 # If OPUS Run Time CPU Detections (RTCD) shall be used.
 # Based on the conditions in celt/arm/armcpu.c:
 # defined(_MSC_VER) || defined(__linux__).
 use_opus_rtcd = cpu_arch == "arm" && (is_win || is_android || is_linux)
 
 config("opus_config") {
   include_dirs = [ "src/include" ]
 }
 
 if (use_opus_rtcd) {
@@ skipping 66 matching lines @@
 
     defines += [ "FIXED_POINT" ]
 
     include_dirs += [ "src/silk/fixed" ]
   } else {
     sources += gypi_values.opus_float_sources
 
     include_dirs += [ "src/silk/float" ]
   }
 
   if (use_opus_arm_optimization) {

[wtc, 2015/01/29 00:39:25]

Although there is a new ARM-specific file celt/arm/celt_neon_intr.c, it is used
only when the OPUS_ARM_NEON_INTR macro is defined. Since we don't define the
OPUS_ARM_NEON_INTR macro, I didn't add celt/arm/celt_neon_intr.c to our build
system.

     sources += [
       "src/celt/arm/fixed_armv4.h",
       "src/celt/arm/fixed_armv5e.h",
       "src/celt/arm/kiss_fft_armv4.h",
       "src/celt/arm/kiss_fft_armv5e.h",
       "src/celt/pitch_arm.h",
       "src/silk/arm/macro_armv4.h",
       "src/silk/arm/macro_armv5e.h",
       "src/silk/arm/SigProc_FIX_armv4.h",
       "src/silk/arm/SigProc_FIX_armv5e.h",
@@ skipping 18 matching lines @@
         "OPUS_ARM_MAY_HAVE_MEDIA",
         "OPUS_ARM_MAY_HAVE_NEON",
         "OPUS_HAVE_RTCD",
       ]
 
       deps = [
         ":convert_rtcd_assembler",
       ]
     }
   }
+
+  if (use_opus_mips_optimization) {
+    sources += [
+      "src/celt/mips/celt_mipsr1.h",
+      "src/celt/mips/fixed_generic_mipsr1.h",
+      "src/celt/mips/kiss_fft_mipsr1.h",
+      "src/celt/mips/mdct_mipsr1.h",
+      "src/celt/mips/pitch_mipsr1.h",
+      "src/celt/mips/vq_mipsr1.c",
+      "src/celt/mips/vq_mipsr1.h",
+      "src/silk/fixed/mips/noise_shape_analysis_FIX_mipsr1.h",
+      "src/silk/fixed/mips/prefilter_FIX_mipsr1.h",
+      "src/silk/fixed/mips/warped_autocorrelation_FIX_mipsr1.h",
+      "src/silk/mips/NSQ_del_dec_mipsr1.h",
+      "src/silk/mips/macros_mipsr1.h",
+      "src/silk/mips/sigproc_fix_mipsr1.h",
+    ]
+
+    defines += [
+      "MIPSr1_ASM",
+      "USE_ALLOCA",

[wtc, 2015/01/29 00:39:25]

These two macros match the settings in third_party/opus/src/Makefile.mips.

+    ]
+  }
 }
 
 executable("opus_compare") {
   sources = [
     "src/src/opus_compare.c",
   ]
 
   configs -= [ "//build/config/compiler:chromium_code" ]
   configs += [ "//build/config/compiler:no_chromium_code" ]
 
@@ skipping 37 matching lines @@
     libs = [ "log" ]
   }
   if (is_clang) {
     cflags = [ "-Wno-absolute-value" ]
   }
 
   deps = [
     ":opus",
   ]
 }