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_ARCH_ARM_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/interface/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 int32_t oneQ8; 26 const int16_t* x; 27 const int16_t* inptr; 28 29 oneQ8 = WEBRTC_SPL_LSHIFT_W32((int32_t)1, 8); // 1.00 in Q8 30 31 x = in + PITCH_MAX_LAG / 2 + 2; 32 scaling = WebRtcSpl_GetScalingSquare((int16_t*)in, 33 PITCH_CORR_LEN2, 34 PITCH_CORR_LEN2); 35 ysum32 = 1; 36 csum32 = 0; 37 x = in + PITCH_MAX_LAG / 2 + 2; 38 for (n = 0; n < PITCH_CORR_LEN2; n++) { 39 ysum32 += WEBRTC_SPL_MUL_16_16_RSFT((int16_t)in[n], 40 (int16_t)in[n], 41 scaling); // Q0 42 csum32 += WEBRTC_SPL_MUL_16_16_RSFT((int16_t)x[n], 43 (int16_t)in[n], 44 scaling); // Q0 45 } 46 logcorQ8 += PITCH_LAG_SPAN2 - 1; 47 lys = WebRtcIsacfix_Log2Q8((uint32_t)ysum32); // Q8 48 lys = WEBRTC_SPL_RSHIFT_W32(lys, 1); //sqrt(ysum); 49 if (csum32 > 0) { 50 lcs = WebRtcIsacfix_Log2Q8((uint32_t)csum32); // 2log(csum) in Q8 51 if (lcs > (lys + oneQ8)) { // csum/sqrt(ysum) > 2 in Q8 52 *logcorQ8 = lcs - lys; // log2(csum/sqrt(ysum)) 53 } else { 54 *logcorQ8 = oneQ8; // 1.00 55 } 56 } else { 57 *logcorQ8 = 0; 58 } 59 60 61 for (k = 1; k < PITCH_LAG_SPAN2; k++) { 62 inptr = &in[k]; 63 ysum32 -= WEBRTC_SPL_MUL_16_16_RSFT((int16_t)in[k - 1], 64 (int16_t)in[k - 1], 65 scaling); 66 ysum32 += WEBRTC_SPL_MUL_16_16_RSFT((int16_t)in[PITCH_CORR_LEN2 + k - 1], 67 (int16_t)in[PITCH_CORR_LEN2 + k - 1], 68 scaling); 69 #ifdef WEBRTC_ARCH_ARM_NEON 70 { 71 int32_t vbuff[4]; 72 int32x4_t int_32x4_sum = vmovq_n_s32(0); 73 // Can't shift a Neon register to right with a non-constant shift value. 74 int32x4_t int_32x4_scale = vdupq_n_s32(-scaling); 75 // Assert a codition used in loop unrolling at compile-time. 76 COMPILE_ASSERT(PITCH_CORR_LEN2 %4 == 0); 77 78 for (n = 0; n < PITCH_CORR_LEN2; n += 4) { 79 int16x4_t int_16x4_x = vld1_s16(&x[n]); 80 int16x4_t int_16x4_in = vld1_s16(&inptr[n]); 81 int32x4_t int_32x4 = vmull_s16(int_16x4_x, int_16x4_in); 82 int_32x4 = vshlq_s32(int_32x4, int_32x4_scale); 83 int_32x4_sum = vaddq_s32(int_32x4_sum, int_32x4); 84 } 85 86 // Use vector store to avoid long stall from data trasferring 87 // from vector to general register. 88 vst1q_s32(vbuff, int_32x4_sum); 89 csum32 = vbuff[0] + vbuff[1]; 90 csum32 += vbuff[2]; 91 csum32 += vbuff[3]; 92 } 93 #else 94 csum32 = 0; 95 if(scaling == 0) { 96 for (n = 0; n < PITCH_CORR_LEN2; n++) { 97 csum32 += x[n] * inptr[n]; 98 } 99 } else { 100 for (n = 0; n < PITCH_CORR_LEN2; n++) { 101 csum32 += (x[n] * inptr[n]) >> scaling; 102 } 103 } 104 #endif 105 106 logcorQ8--; 107 108 lys = WebRtcIsacfix_Log2Q8((uint32_t)ysum32); // Q8 109 lys = WEBRTC_SPL_RSHIFT_W32(lys, 1); //sqrt(ysum); 110 111 if (csum32 > 0) { 112 lcs = WebRtcIsacfix_Log2Q8((uint32_t)csum32); // 2log(csum) in Q8 113 if (lcs > (lys + oneQ8)) { // csum/sqrt(ysum) > 2 114 *logcorQ8 = lcs - lys; // log2(csum/sqrt(ysum)) 115 } else { 116 *logcorQ8 = oneQ8; // 1.00 117 } 118 } else { 119 *logcorQ8 = 0; 120 } 121 } 122 } 123
