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/*
* Copyright (c) 2012 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.
*/
#include "webrtc/modules/audio_processing/aecm/aecm_core.h"
#include <arm_neon.h>
#include <assert.h>
#include "webrtc/common_audio/signal_processing/include/real_fft.h"
// TODO(kma): Re-write the corresponding assembly file, the offset
// generating script and makefile, to replace these C functions.
// Square root of Hanning window in Q14.
const ALIGN8_BEG int16_t WebRtcAecm_kSqrtHanning[] ALIGN8_END = {
0,
399, 798, 1196, 1594, 1990, 2386, 2780, 3172,
3562, 3951, 4337, 4720, 5101, 5478, 5853, 6224,
6591, 6954, 7313, 7668, 8019, 8364, 8705, 9040,
9370, 9695, 10013, 10326, 10633, 10933, 11227, 11514,
11795, 12068, 12335, 12594, 12845, 13089, 13325, 13553,
13773, 13985, 14189, 14384, 14571, 14749, 14918, 15079,
15231, 15373, 15506, 15631, 15746, 15851, 15947, 16034,
16111, 16179, 16237, 16286, 16325, 16354, 16373, 16384
};
static inline void AddLanes(uint32_t* ptr, uint32x4_t v) {
#if defined(WEBRTC_ARCH_ARM64)
*(ptr) = vaddvq_u32(v);
#else
uint32x2_t tmp_v;
tmp_v = vadd_u32(vget_low_u32(v), vget_high_u32(v));
tmp_v = vpadd_u32(tmp_v, tmp_v);
*(ptr) = vget_lane_u32(tmp_v, 0);
#endif
}
void WebRtcAecm_CalcLinearEnergiesNeon(AecmCore* aecm,
const uint16_t* far_spectrum,
int32_t* echo_est,
uint32_t* far_energy,
uint32_t* echo_energy_adapt,
uint32_t* echo_energy_stored) {
int16_t* start_stored_p = aecm->channelStored;
int16_t* start_adapt_p = aecm->channelAdapt16;
int32_t* echo_est_p = echo_est;
const int16_t* end_stored_p = aecm->channelStored + PART_LEN;
const uint16_t* far_spectrum_p = far_spectrum;
int16x8_t store_v, adapt_v;
uint16x8_t spectrum_v;
uint32x4_t echo_est_v_low, echo_est_v_high;
uint32x4_t far_energy_v, echo_stored_v, echo_adapt_v;
far_energy_v = vdupq_n_u32(0);
echo_adapt_v = vdupq_n_u32(0);
echo_stored_v = vdupq_n_u32(0);
// Get energy for the delayed far end signal and estimated
// echo using both stored and adapted channels.
// The C code:
// for (i = 0; i < PART_LEN1; i++) {
// echo_est[i] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i],
// far_spectrum[i]);
// (*far_energy) += (uint32_t)(far_spectrum[i]);
// *echo_energy_adapt += aecm->channelAdapt16[i] * far_spectrum[i];
// (*echo_energy_stored) += (uint32_t)echo_est[i];
// }
while (start_stored_p < end_stored_p) {
spectrum_v = vld1q_u16(far_spectrum_p);
adapt_v = vld1q_s16(start_adapt_p);
store_v = vld1q_s16(start_stored_p);
far_energy_v = vaddw_u16(far_energy_v, vget_low_u16(spectrum_v));
far_energy_v = vaddw_u16(far_energy_v, vget_high_u16(spectrum_v));
echo_est_v_low = vmull_u16(vreinterpret_u16_s16(vget_low_s16(store_v)),
vget_low_u16(spectrum_v));
echo_est_v_high = vmull_u16(vreinterpret_u16_s16(vget_high_s16(store_v)),
vget_high_u16(spectrum_v));
vst1q_s32(echo_est_p, vreinterpretq_s32_u32(echo_est_v_low));
vst1q_s32(echo_est_p + 4, vreinterpretq_s32_u32(echo_est_v_high));
echo_stored_v = vaddq_u32(echo_est_v_low, echo_stored_v);
echo_stored_v = vaddq_u32(echo_est_v_high, echo_stored_v);
echo_adapt_v = vmlal_u16(echo_adapt_v,
vreinterpret_u16_s16(vget_low_s16(adapt_v)),
vget_low_u16(spectrum_v));
echo_adapt_v = vmlal_u16(echo_adapt_v,
vreinterpret_u16_s16(vget_high_s16(adapt_v)),
vget_high_u16(spectrum_v));
start_stored_p += 8;
start_adapt_p += 8;
far_spectrum_p += 8;
echo_est_p += 8;
}
AddLanes(far_energy, far_energy_v);
AddLanes(echo_energy_stored, echo_stored_v);
AddLanes(echo_energy_adapt, echo_adapt_v);
echo_est[PART_LEN] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[PART_LEN],
far_spectrum[PART_LEN]);
*echo_energy_stored += (uint32_t)echo_est[PART_LEN];
*far_energy += (uint32_t)far_spectrum[PART_LEN];
*echo_energy_adapt += aecm->channelAdapt16[PART_LEN] * far_spectrum[PART_LEN];
}
void WebRtcAecm_StoreAdaptiveChannelNeon(AecmCore* aecm,
const uint16_t* far_spectrum,
int32_t* echo_est) {
assert((uintptr_t)echo_est % 32 == 0);
assert((uintptr_t)(aecm->channelStored) % 16 == 0);
assert((uintptr_t)(aecm->channelAdapt16) % 16 == 0);
// This is C code of following optimized code.
// During startup we store the channel every block.
// memcpy(aecm->channelStored,
// aecm->channelAdapt16,
// sizeof(int16_t) * PART_LEN1);
// Recalculate echo estimate
// for (i = 0; i < PART_LEN; i += 4) {
// echo_est[i] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i],
// far_spectrum[i]);
// echo_est[i + 1] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i + 1],
// far_spectrum[i + 1]);
// echo_est[i + 2] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i + 2],
// far_spectrum[i + 2]);
// echo_est[i + 3] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i + 3],
// far_spectrum[i + 3]);
// }
// echo_est[i] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[i],
// far_spectrum[i]);
const uint16_t* far_spectrum_p = far_spectrum;
int16_t* start_adapt_p = aecm->channelAdapt16;
int16_t* start_stored_p = aecm->channelStored;
const int16_t* end_stored_p = aecm->channelStored + PART_LEN;
int32_t* echo_est_p = echo_est;
uint16x8_t far_spectrum_v;
int16x8_t adapt_v;
uint32x4_t echo_est_v_low, echo_est_v_high;
while (start_stored_p < end_stored_p) {
far_spectrum_v = vld1q_u16(far_spectrum_p);
adapt_v = vld1q_s16(start_adapt_p);
vst1q_s16(start_stored_p, adapt_v);
echo_est_v_low = vmull_u16(vget_low_u16(far_spectrum_v),
vget_low_u16(vreinterpretq_u16_s16(adapt_v)));
echo_est_v_high = vmull_u16(vget_high_u16(far_spectrum_v),
vget_high_u16(vreinterpretq_u16_s16(adapt_v)));
vst1q_s32(echo_est_p, vreinterpretq_s32_u32(echo_est_v_low));
vst1q_s32(echo_est_p + 4, vreinterpretq_s32_u32(echo_est_v_high));
far_spectrum_p += 8;
start_adapt_p += 8;
start_stored_p += 8;
echo_est_p += 8;
}
aecm->channelStored[PART_LEN] = aecm->channelAdapt16[PART_LEN];
echo_est[PART_LEN] = WEBRTC_SPL_MUL_16_U16(aecm->channelStored[PART_LEN],
far_spectrum[PART_LEN]);
}
void WebRtcAecm_ResetAdaptiveChannelNeon(AecmCore* aecm) {
assert((uintptr_t)(aecm->channelStored) % 16 == 0);
assert((uintptr_t)(aecm->channelAdapt16) % 16 == 0);
assert((uintptr_t)(aecm->channelAdapt32) % 32 == 0);
// The C code of following optimized code.
// for (i = 0; i < PART_LEN1; i++) {
// aecm->channelAdapt16[i] = aecm->channelStored[i];
// aecm->channelAdapt32[i] = WEBRTC_SPL_LSHIFT_W32(
// (int32_t)aecm->channelStored[i], 16);
// }
int16_t* start_stored_p = aecm->channelStored;
int16_t* start_adapt16_p = aecm->channelAdapt16;
int32_t* start_adapt32_p = aecm->channelAdapt32;
const int16_t* end_stored_p = start_stored_p + PART_LEN;
int16x8_t stored_v;
int32x4_t adapt32_v_low, adapt32_v_high;
while (start_stored_p < end_stored_p) {
stored_v = vld1q_s16(start_stored_p);
vst1q_s16(start_adapt16_p, stored_v);
adapt32_v_low = vshll_n_s16(vget_low_s16(stored_v), 16);
adapt32_v_high = vshll_n_s16(vget_high_s16(stored_v), 16);
vst1q_s32(start_adapt32_p, adapt32_v_low);
vst1q_s32(start_adapt32_p + 4, adapt32_v_high);
start_stored_p += 8;
start_adapt16_p += 8;
start_adapt32_p += 8;
}
aecm->channelAdapt16[PART_LEN] = aecm->channelStored[PART_LEN];
aecm->channelAdapt32[PART_LEN] = (int32_t)aecm->channelStored[PART_LEN] << 16;
}
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