1 files changed, 155 insertions, 0 deletions
diff --git a/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h
new file mode 100644
index 0000000000..2b0995886a
--- /dev/null
+++ b/third_party/libwebrtc/common_audio/signal_processing/include/spl_inl.h
@@ -0,0 +1,155 @@
+/*
+ *  Copyright (c) 2011 The WebRTC project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license
+ *  that can be found in the LICENSE file in the root of the source
+ *  tree. An additional intellectual property rights grant can be found
+ *  in the file PATENTS.  All contributing project authors may
+ *  be found in the AUTHORS file in the root of the source tree.
+ */
+
+// This header file includes the inline functions in
+// the fix point signal processing library.
+
+#ifndef COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
+#define COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_
+
+#include <stdint.h>
+
+#include "rtc_base/compile_assert_c.h"
+
+extern const int8_t kWebRtcSpl_CountLeadingZeros32_Table[64];
+
+// Don't call this directly except in tests!
+static __inline int WebRtcSpl_CountLeadingZeros32_NotBuiltin(uint32_t n) {
+  // Normalize n by rounding up to the nearest number that is a sequence of 0
+  // bits followed by a sequence of 1 bits. This number has the same number of
+  // leading zeros as the original n. There are exactly 33 such values.
+  n |= n >> 1;
+  n |= n >> 2;
+  n |= n >> 4;
+  n |= n >> 8;
+  n |= n >> 16;
+
+  // Multiply the modified n with a constant selected (by exhaustive search)
+  // such that each of the 33 possible values of n give a product whose 6 most
+  // significant bits are unique. Then look up the answer in the table.
+  return kWebRtcSpl_CountLeadingZeros32_Table[(n * 0x8c0b2891) >> 26];
+}
+
+// Don't call this directly except in tests!
+static __inline int WebRtcSpl_CountLeadingZeros64_NotBuiltin(uint64_t n) {
+  const int leading_zeros = n >> 32 == 0 ? 32 : 0;
+  return leading_zeros + WebRtcSpl_CountLeadingZeros32_NotBuiltin(
+                             (uint32_t)(n >> (32 - leading_zeros)));
+}
+
+// Returns the number of leading zero bits in the argument.
+static __inline int WebRtcSpl_CountLeadingZeros32(uint32_t n) {
+#ifdef __GNUC__
+  RTC_COMPILE_ASSERT(sizeof(unsigned int) == sizeof(uint32_t));
+  return n == 0 ? 32 : __builtin_clz(n);
+#else
+  return WebRtcSpl_CountLeadingZeros32_NotBuiltin(n);
+#endif
+}
+
+// Returns the number of leading zero bits in the argument.
+static __inline int WebRtcSpl_CountLeadingZeros64(uint64_t n) {
+#ifdef __GNUC__
+  RTC_COMPILE_ASSERT(sizeof(unsigned long long) == sizeof(uint64_t));  // NOLINT
+  return n == 0 ? 64 : __builtin_clzll(n);
+#else
+  return WebRtcSpl_CountLeadingZeros64_NotBuiltin(n);
+#endif
+}
+
+#ifdef WEBRTC_ARCH_ARM_V7
+#include "common_audio/signal_processing/include/spl_inl_armv7.h"
+#else
+
+#if defined(MIPS32_LE)
+#include "common_audio/signal_processing/include/spl_inl_mips.h"
+#endif
+
+#if !defined(MIPS_DSP_R1_LE)
+static __inline int16_t WebRtcSpl_SatW32ToW16(int32_t value32) {
+  int16_t out16 = (int16_t)value32;
+
+  if (value32 > 32767)
+    out16 = 32767;
+  else if (value32 < -32768)
+    out16 = -32768;
+
+  return out16;
+}
+
+static __inline int32_t WebRtcSpl_AddSatW32(int32_t a, int32_t b) {
+  // Do the addition in unsigned numbers, since signed overflow is undefined
+  // behavior.
+  const int32_t sum = (int32_t)((uint32_t)a + (uint32_t)b);
+
+  // a + b can't overflow if a and b have different signs. If they have the
+  // same sign, a + b also has the same sign iff it didn't overflow.
+  if ((a < 0) == (b < 0) && (a < 0) != (sum < 0)) {
+    // The direction of the overflow is obvious from the sign of a + b.
+    return sum < 0 ? INT32_MAX : INT32_MIN;
+  }
+  return sum;
+}
+
+static __inline int32_t WebRtcSpl_SubSatW32(int32_t a, int32_t b) {
+  // Do the subtraction in unsigned numbers, since signed overflow is undefined
+  // behavior.
+  const int32_t diff = (int32_t)((uint32_t)a - (uint32_t)b);
+
+  // a - b can't overflow if a and b have the same sign. If they have different
+  // signs, a - b has the same sign as a iff it didn't overflow.
+  if ((a < 0) != (b < 0) && (a < 0) != (diff < 0)) {
+    // The direction of the overflow is obvious from the sign of a - b.
+    return diff < 0 ? INT32_MAX : INT32_MIN;
+  }
+  return diff;
+}
+
+static __inline int16_t WebRtcSpl_AddSatW16(int16_t a, int16_t b) {
+  return WebRtcSpl_SatW32ToW16((int32_t)a + (int32_t)b);
+}
+
+static __inline int16_t WebRtcSpl_SubSatW16(int16_t var1, int16_t var2) {
+  return WebRtcSpl_SatW32ToW16((int32_t)var1 - (int32_t)var2);
+}
+#endif  // #if !defined(MIPS_DSP_R1_LE)
+
+#if !defined(MIPS32_LE)
+static __inline int16_t WebRtcSpl_GetSizeInBits(uint32_t n) {
+  return 32 - WebRtcSpl_CountLeadingZeros32(n);
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormW32(int32_t a) {
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a < 0 ? ~a : a) - 1;
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormU32(uint32_t a) {
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a);
+}
+
+// Return the number of steps a can be left-shifted without overflow,
+// or 0 if a == 0.
+static __inline int16_t WebRtcSpl_NormW16(int16_t a) {
+  const int32_t a32 = a;
+  return a == 0 ? 0 : WebRtcSpl_CountLeadingZeros32(a < 0 ? ~a32 : a32) - 17;
+}
+
+static __inline int32_t WebRtc_MulAccumW16(int16_t a, int16_t b, int32_t c) {
+  return (a * b + c);
+}
+#endif  // #if !defined(MIPS32_LE)
+
+#endif  // WEBRTC_ARCH_ARM_V7
+
+#endif  // COMMON_AUDIO_SIGNAL_PROCESSING_INCLUDE_SPL_INL_H_