Made the method PartitionDelay independent of the AEC state.

webrtc/modules/audio_processing/aec/aec_core_sse2.cc

Index: webrtc/modules/audio_processing/aec/aec_core_sse2.cc
diff --git a/webrtc/modules/audio_processing/aec/aec_core_sse2.cc b/webrtc/modules/audio_processing/aec/aec_core_sse2.cc
index 91d98b9773a1ad8f33d8cd1efde4f9a54252d6b4..ec466f6c2a64b2d90c7b0ef7b29486e57c718b20 100644
--- a/webrtc/modules/audio_processing/aec/aec_core_sse2.cc
+++ b/webrtc/modules/audio_processing/aec/aec_core_sse2.cc
@@ -449,7 +449,9 @@ __inline static void _mm_add_ps_4x1(__m128 sum, float* dst) {
   _mm_store_ss(dst, sum);
 }
 
-static int PartitionDelaySSE2(const AecCore* aec) {
+static int PartitionDelaySSE2(
+    int num_partitions,
+    float h_fft_buf[2][kExtendedNumPartitions * PART_LEN1]) {
   // Measures the energy in each filter partition and returns the partition with
   // highest energy.
   // TODO(bjornv): Spread computational cost by computing one partition per
@@ -458,15 +460,15 @@ static int PartitionDelaySSE2(const AecCore* aec) {
   int i;
   int delay = 0;
 
-  for (i = 0; i < aec->num_partitions; i++) {
+  for (i = 0; i < num_partitions; i++) {
     int j;
     int pos = i * PART_LEN1;
     float wfEn = 0;
     __m128 vec_wfEn = _mm_set1_ps(0.0f);
     // vectorized code (four at once)
     for (j = 0; j + 3 < PART_LEN1; j += 4) {
-      const __m128 vec_wfBuf0 = _mm_loadu_ps(&aec->wfBuf[0][pos + j]);
-      const __m128 vec_wfBuf1 = _mm_loadu_ps(&aec->wfBuf[1][pos + j]);
+      const __m128 vec_wfBuf0 = _mm_loadu_ps(&h_fft_buf[0][pos + j]);
+      const __m128 vec_wfBuf1 = _mm_loadu_ps(&h_fft_buf[1][pos + j]);
       vec_wfEn = _mm_add_ps(vec_wfEn, _mm_mul_ps(vec_wfBuf0, vec_wfBuf0));
       vec_wfEn = _mm_add_ps(vec_wfEn, _mm_mul_ps(vec_wfBuf1, vec_wfBuf1));
     }
@@ -474,8 +476,8 @@ static int PartitionDelaySSE2(const AecCore* aec) {
 
     // scalar code for the remaining items.
     for (; j < PART_LEN1; j++) {
-      wfEn += aec->wfBuf[0][pos + j] * aec->wfBuf[0][pos + j] +
-              aec->wfBuf[1][pos + j] * aec->wfBuf[1][pos + j];
+      wfEn += h_fft_buf[0][pos + j] * h_fft_buf[0][pos + j] +
+              h_fft_buf[1][pos + j] * h_fft_buf[1][pos + j];
     }
 
     if (wfEn > wfEnMax) {