1 /* 2 * Copyright (c) 2014 The WebRTC project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #include "webrtc/modules/audio_coding/codecs/isac/fix/source/pitch_estimator.h" 12 13 #ifdef WEBRTC_HAS_NEON 14 #include <arm_neon.h> 15 #endif 16 17 #include "webrtc/common_audio/signal_processing/include/signal_processing_library.h" 18 #include "webrtc/system_wrappers/include/compile_assert_c.h" 19 20 extern int32_t WebRtcIsacfix_Log2Q8(uint32_t x); 21 22 void WebRtcIsacfix_PCorr2Q32(const int16_t* in, int32_t* logcorQ8) { 23 int16_t scaling,n,k; 24 int32_t ysum32,csum32, lys, lcs; 25 const int32_t oneQ8 = 1 << 8; // 1.00 in Q8 26 const int16_t* x; 27 const int16_t* inptr; 28 29 x = in + PITCH_MAX_LAG / 2 + 2; 30 scaling = WebRtcSpl_GetScalingSquare((int16_t*)in, 31 PITCH_CORR_LEN2, 32 PITCH_CORR_LEN2); 33 ysum32 = 1; 34 csum32 = 0; 35 x = in + PITCH_MAX_LAG / 2 + 2; 36 for (n = 0; n < PITCH_CORR_LEN2; n++) { 37 ysum32 += in[n] * in[n] >> scaling; // Q0 38 csum32 += x[n] * in[n] >> scaling; // Q0 39 } 40 logcorQ8 += PITCH_LAG_SPAN2 - 1; 41 lys = WebRtcIsacfix_Log2Q8((uint32_t)ysum32) >> 1; // Q8, sqrt(ysum) 42 if (csum32 > 0) { 43 lcs = WebRtcIsacfix_Log2Q8((uint32_t)csum32); // 2log(csum) in Q8 44 if (lcs > (lys + oneQ8)) { // csum/sqrt(ysum) > 2 in Q8 45 *logcorQ8 = lcs - lys; // log2(csum/sqrt(ysum)) 46 } else { 47 *logcorQ8 = oneQ8; // 1.00 48 } 49 } else { 50 *logcorQ8 = 0; 51 } 52 53 54 for (k = 1; k < PITCH_LAG_SPAN2; k++) { 55 inptr = &in[k]; 56 ysum32 -= in[k - 1] * in[k - 1] >> scaling; 57 ysum32 += in[PITCH_CORR_LEN2 + k - 1] * in[PITCH_CORR_LEN2 + k - 1] >> 58 scaling; 59 60 // TODO(zhongwei.yao): Move this function into a separate NEON code file so 61 // that WEBRTC_DETECT_NEON could take advantage of it. 62 #ifdef WEBRTC_HAS_NEON 63 { 64 int32_t vbuff[4]; 65 int32x4_t int_32x4_sum = vmovq_n_s32(0); 66 // Can't shift a Neon register to right with a non-constant shift value. 67 int32x4_t int_32x4_scale = vdupq_n_s32(-scaling); 68 // Assert a codition used in loop unrolling at compile-time. 69 COMPILE_ASSERT(PITCH_CORR_LEN2 %4 == 0); 70 71 for (n = 0; n < PITCH_CORR_LEN2; n += 4) { 72 int16x4_t int_16x4_x = vld1_s16(&x[n]); 73 int16x4_t int_16x4_in = vld1_s16(&inptr[n]); 74 int32x4_t int_32x4 = vmull_s16(int_16x4_x, int_16x4_in); 75 int_32x4 = vshlq_s32(int_32x4, int_32x4_scale); 76 int_32x4_sum = vaddq_s32(int_32x4_sum, int_32x4); 77 } 78 79 // Use vector store to avoid long stall from data trasferring 80 // from vector to general register. 81 vst1q_s32(vbuff, int_32x4_sum); 82 csum32 = vbuff[0] + vbuff[1]; 83 csum32 += vbuff[2]; 84 csum32 += vbuff[3]; 85 } 86 #else 87 csum32 = 0; 88 if(scaling == 0) { 89 for (n = 0; n < PITCH_CORR_LEN2; n++) { 90 csum32 += x[n] * inptr[n]; 91 } 92 } else { 93 for (n = 0; n < PITCH_CORR_LEN2; n++) { 94 csum32 += (x[n] * inptr[n]) >> scaling; 95 } 96 } 97 #endif 98 99 logcorQ8--; 100 101 lys = WebRtcIsacfix_Log2Q8((uint32_t)ysum32) >> 1; // Q8, sqrt(ysum) 102 103 if (csum32 > 0) { 104 lcs = WebRtcIsacfix_Log2Q8((uint32_t)csum32); // 2log(csum) in Q8 105 if (lcs > (lys + oneQ8)) { // csum/sqrt(ysum) > 2 106 *logcorQ8 = lcs - lys; // log2(csum/sqrt(ysum)) 107 } else { 108 *logcorQ8 = oneQ8; // 1.00 109 } 110 } else { 111 *logcorQ8 = 0; 112 } 113 } 114 } 115
