PJ_DEF(pj_status_t) webrtc_aec_cancel_echo_playback(void *state,
                         pj_int16_t *play_frm ){
    webrtc_ec *echo = (webrtc_ec*) state;
    unsigned i, j, frm_idx = 0;
    int status;
    const sample * buf_ptr;
                         
    for(i = echo->samples_per_frame / echo->subframe_len; i > 0; i--) {
#if PJMEDIA_WEBRTC_AEC_USE_MOBILE
	        buf_ptr = &play_frm[frm_idx];
#else
	        for (j = 0; j < echo->subframe_len; j++) {
	            echo->tmp_buf2[j] = play_frm[frm_idx+j];
	        }
	        buf_ptr = echo->tmp_buf2;
#endif
        
	    /* Feed farend buffer */
	    status = WebRtcAec_BufferFarend(echo->AEC_inst, buf_ptr,
	                                        echo->subframe_len);
           frm_idx+= echo->subframe_len;
    }
    return PJ_SUCCESS;
}
PJ_DEF(pj_status_t) webrtc_aec_cancel_echo_capture(void *state,
                         pj_int16_t *rec_frm,
                         unsigned options ){
    webrtc_ec *echo = (webrtc_ec*) state;
    int status;
    unsigned i, j, frm_idx = 0;
    const sample * buf_ptr;
    sample * out_buf_ptr;
                 
    for(i = echo->samples_per_frame / echo->subframe_len; i > 0; i--) {
#if PJMEDIA_WEBRTC_AEC_USE_MOBILE
	        buf_ptr = &rec_frm[frm_idx];
#else
	        for (j = 0; j < echo->subframe_len; j++) {
           		 echo->tmp_buf[j] = rec_frm[frm_idx+j];
	            echo->tmp_buf2[j] = NULL;
	        }
       	 buf_ptr = echo->tmp_buf2;
#endif
        buf_ptr = echo->tmp_buf;
        out_buf_ptr = echo->tmp_buf2;
#if PJMEDIA_WEBRTC_AEC_USE_MOBILE
        status = WebRtcAecm_Process(echo->AEC_inst, &rec_frm[frm_idx],
                                    (echo->NS_inst? buf_ptr: NULL),
                                    out_buf_ptr, echo->subframe_len,
                                    echo->tail);
#else
        status = WebRtcAec_Process(echo->AEC_inst, &buf_ptr,
                                   echo->channel_count, &out_buf_ptr,
                                   echo->subframe_len, (int16_t)echo->tail, 0);
#endif
        if (status != 0) {
            print_webrtc_aec_error("Process echo", echo->AEC_inst);
            return PJ_EUNKNOWN;
        }
         for (j = 0; j < echo->subframe_len; j++) {
            rec_frm[frm_idx++] = (pj_int16_t)out_buf_ptr[j];
        }
    }
    return PJ_SUCCESS;
}
    

/*
 * WebRTC AEC prototypes
 */
#if defined(PJMEDIA_HAS_WEBRTC_AEC) && PJMEDIA_HAS_WEBRTC_AEC!=0
static struct ec_operations webrtc_aec_op =
{
    "WebRTC AEC",
    &webrtc_aec_create,
    &webrtc_aec_destroy,
    &webrtc_aec_reset,
    &webrtc_aec_cancel_echo,
    &webrtc_aec_cancel_echo_playback,
    &webrtc_aec_cancel_echo_capture,
    &webrtc_aec_get_stat
};
#endif

#webrtc echo--ec-opt=3#webrtc-aec3 echo
#--ec-opt=4#--stereo--ec-tail=75

./configure --host=arm-openwrt-linux-muslgnueabi  --prefix=$PWD/install  
--disable-libwebrtc --disable-libyuv --disable-v4l2   --disable-opencore-amrnb 
--disable-speex-codec --disable-speex-aec 
--with-openh264=/home/app/thirds_libs_src/pjproject-2.12.1/third_party/openh264-2.3.1  
--enable-libwebrtc-aec3 --with-opus=/home/ap/thirds_libs_src/pjproject-2.12.1/third_party/opus/ 


Удалить Third_party\build\os-auto.mak
ifneq (,1)
ifeq (0,1)
# External webrtc AEC3
else
DIRS += webrtc_aec3
WEBRTC_AEC3_OTHER_CFLAGS = -fexceptions -mfpu=neon -mfloat-abi=hard -DWEBRTC_LINUX=1  -DWEBRTC_APM_DEBUG_DUMP=0 -DWEBRTC_POSIX=1
ifneq ($(findstring sse2,sse2),)
#    export WEBRTC_AEC3_SRC = \
#	common_audio/resampler/sinc_resampler_sse.o \
#	common_audio/third_party/ooura/fft_size_128/ooura_fft_sse2.o
#    export WEBRTC_AEC3_SRC += \
#	common_audio/resampler/sinc_resampler_avx2.o \
#	modules/audio_processing/aec3/adaptive_fir_filter_erl_avx2.o \
#	modules/audio_processing/aec3/adaptive_fir_filter_avx2.o \
#	modules/audio_processing/aec3/fft_data_avx2.o \
#	modules/audio_processing/aec3/matched_filter_avx2.o \
#	modules/audio_processing/aec3/vector_math_avx2.o \
#	modules/audio_processing/agc2/rnn_vad/rnn_vector_math_avx2.o
#    WEBRTC_AEC3_OTHER_CFLAGS += -mfma
else ifneq ($(findstring neon,sse2),)
    export WEBRTC_AEC3_SRC = \
	common_audio/resampler/sinc_resampler_neon.o \
	common_audio/third_party/ooura/fft_size_128/ooura_fft_neon.o
    WEBRTC_AEC3_OTHER_CFLAGS += -DWEBRTC_HAS_NEON
endif
endif
endif


Параметр Конфигурацияec-3, добавьте webrtc в файл конфигурации запуска. echoиз Конфигурация

#webrtc echo
--ec-opt=4