1 /* Copyright (c) 2023 Amazon */
2 /*
3 Redistribution and use in source and binary forms, with or without
4 modification, are permitted provided that the following conditions
5 are met:
6
7 - Redistributions of source code must retain the above copyright
8 notice, this list of conditions and the following disclaimer.
9
10 - Redistributions in binary form must reproduce the above copyright
11 notice, this list of conditions and the following disclaimer in the
12 documentation and/or other materials provided with the distribution.
13
14 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
15 ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
16 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
17 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
18 OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
19 EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
20 PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
21 PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
22 LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
23 NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
24 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26
27 #ifdef HAVE_CONFIG_H
28 #include "config.h"
29 #endif
30
31 #include "fargan.h"
32 #include "os_support.h"
33 #include "freq.h"
34 #include "fargan_data.h"
35 #include "lpcnet.h"
36 #include "pitch.h"
37 #include "nnet.h"
38 #include "lpcnet_private.h"
39 #include "cpu_support.h"
40
41 #define FARGAN_FEATURES (NB_FEATURES)
42
compute_fargan_cond(FARGANState * st,float * cond,const float * features,int period)43 static void compute_fargan_cond(FARGANState *st, float *cond, const float *features, int period)
44 {
45 FARGAN *model;
46 float dense_in[NB_FEATURES+COND_NET_PEMBED_OUT_SIZE];
47 float conv1_in[COND_NET_FCONV1_IN_SIZE];
48 float fdense2_in[COND_NET_FCONV1_OUT_SIZE];
49 model = &st->model;
50 celt_assert(FARGAN_FEATURES+COND_NET_PEMBED_OUT_SIZE == model->cond_net_fdense1.nb_inputs);
51 celt_assert(COND_NET_FCONV1_IN_SIZE == model->cond_net_fdense1.nb_outputs);
52 celt_assert(COND_NET_FCONV1_OUT_SIZE == model->cond_net_fconv1.nb_outputs);
53 OPUS_COPY(&dense_in[NB_FEATURES], &model->cond_net_pembed.float_weights[IMAX(0,IMIN(period-32, 223))*COND_NET_PEMBED_OUT_SIZE], COND_NET_PEMBED_OUT_SIZE);
54 OPUS_COPY(dense_in, features, NB_FEATURES);
55
56 compute_generic_dense(&model->cond_net_fdense1, conv1_in, dense_in, ACTIVATION_TANH, st->arch);
57 compute_generic_conv1d(&model->cond_net_fconv1, fdense2_in, st->cond_conv1_state, conv1_in, COND_NET_FCONV1_IN_SIZE, ACTIVATION_TANH, st->arch);
58 compute_generic_dense(&model->cond_net_fdense2, cond, fdense2_in, ACTIVATION_TANH, st->arch);
59 }
60
fargan_deemphasis(float * pcm,float * deemph_mem)61 static void fargan_deemphasis(float *pcm, float *deemph_mem) {
62 int i;
63 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) {
64 pcm[i] += FARGAN_DEEMPHASIS * *deemph_mem;
65 *deemph_mem = pcm[i];
66 }
67 }
68
run_fargan_subframe(FARGANState * st,float * pcm,const float * cond,int period)69 static void run_fargan_subframe(FARGANState *st, float *pcm, const float *cond, int period)
70 {
71 int i, pos;
72 float fwc0_in[SIG_NET_INPUT_SIZE];
73 float gru1_in[SIG_NET_FWC0_CONV_OUT_SIZE+2*FARGAN_SUBFRAME_SIZE];
74 float gru2_in[SIG_NET_GRU1_OUT_SIZE+2*FARGAN_SUBFRAME_SIZE];
75 float gru3_in[SIG_NET_GRU2_OUT_SIZE+2*FARGAN_SUBFRAME_SIZE];
76 float pred[FARGAN_SUBFRAME_SIZE+4];
77 float prev[FARGAN_SUBFRAME_SIZE];
78 float pitch_gate[4];
79 float gain;
80 float gain_1;
81 float skip_cat[10000];
82 float skip_out[SIG_NET_SKIP_DENSE_OUT_SIZE];
83 FARGAN *model;
84
85 celt_assert(st->cont_initialized);
86 model = &st->model;
87
88 compute_generic_dense(&model->sig_net_cond_gain_dense, &gain, cond, ACTIVATION_LINEAR, st->arch);
89 gain = exp(gain);
90 gain_1 = 1.f/(1e-5f + gain);
91
92 pos = PITCH_MAX_PERIOD-period-2;
93 for (i=0;i<FARGAN_SUBFRAME_SIZE+4;i++) {
94 pred[i] = MIN32(1.f, MAX32(-1.f, gain_1*st->pitch_buf[IMAX(0, pos)]));
95 pos++;
96 if (pos == PITCH_MAX_PERIOD) pos -= period;
97 }
98 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) prev[i] = MAX32(-1.f, MIN16(1.f, gain_1*st->pitch_buf[PITCH_MAX_PERIOD-FARGAN_SUBFRAME_SIZE+i]));
99
100 OPUS_COPY(&fwc0_in[0], &cond[0], FARGAN_COND_SIZE);
101 OPUS_COPY(&fwc0_in[FARGAN_COND_SIZE], pred, FARGAN_SUBFRAME_SIZE+4);
102 OPUS_COPY(&fwc0_in[FARGAN_COND_SIZE+FARGAN_SUBFRAME_SIZE+4], prev, FARGAN_SUBFRAME_SIZE);
103
104 compute_generic_conv1d(&model->sig_net_fwc0_conv, gru1_in, st->fwc0_mem, fwc0_in, SIG_NET_INPUT_SIZE, ACTIVATION_TANH, st->arch);
105 celt_assert(SIG_NET_FWC0_GLU_GATE_OUT_SIZE == model->sig_net_fwc0_glu_gate.nb_outputs);
106 compute_glu(&model->sig_net_fwc0_glu_gate, gru1_in, gru1_in, st->arch);
107
108 compute_generic_dense(&model->sig_net_gain_dense_out, pitch_gate, gru1_in, ACTIVATION_SIGMOID, st->arch);
109
110 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) gru1_in[SIG_NET_FWC0_GLU_GATE_OUT_SIZE+i] = pitch_gate[0]*pred[i+2];
111 OPUS_COPY(&gru1_in[SIG_NET_FWC0_GLU_GATE_OUT_SIZE+FARGAN_SUBFRAME_SIZE], prev, FARGAN_SUBFRAME_SIZE);
112 compute_generic_gru(&model->sig_net_gru1_input, &model->sig_net_gru1_recurrent, st->gru1_state, gru1_in, st->arch);
113 compute_glu(&model->sig_net_gru1_glu_gate, gru2_in, st->gru1_state, st->arch);
114
115 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) gru2_in[SIG_NET_GRU1_OUT_SIZE+i] = pitch_gate[1]*pred[i+2];
116 OPUS_COPY(&gru2_in[SIG_NET_GRU1_OUT_SIZE+FARGAN_SUBFRAME_SIZE], prev, FARGAN_SUBFRAME_SIZE);
117 compute_generic_gru(&model->sig_net_gru2_input, &model->sig_net_gru2_recurrent, st->gru2_state, gru2_in, st->arch);
118 compute_glu(&model->sig_net_gru2_glu_gate, gru3_in, st->gru2_state, st->arch);
119
120 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) gru3_in[SIG_NET_GRU2_OUT_SIZE+i] = pitch_gate[2]*pred[i+2];
121 OPUS_COPY(&gru3_in[SIG_NET_GRU2_OUT_SIZE+FARGAN_SUBFRAME_SIZE], prev, FARGAN_SUBFRAME_SIZE);
122 compute_generic_gru(&model->sig_net_gru3_input, &model->sig_net_gru3_recurrent, st->gru3_state, gru3_in, st->arch);
123 compute_glu(&model->sig_net_gru3_glu_gate, &skip_cat[SIG_NET_GRU1_OUT_SIZE+SIG_NET_GRU2_OUT_SIZE], st->gru3_state, st->arch);
124
125 OPUS_COPY(skip_cat, gru2_in, SIG_NET_GRU1_OUT_SIZE);
126 OPUS_COPY(&skip_cat[SIG_NET_GRU1_OUT_SIZE], gru3_in, SIG_NET_GRU2_OUT_SIZE);
127 OPUS_COPY(&skip_cat[SIG_NET_GRU1_OUT_SIZE+SIG_NET_GRU2_OUT_SIZE+SIG_NET_GRU3_OUT_SIZE], gru1_in, SIG_NET_FWC0_CONV_OUT_SIZE);
128 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) skip_cat[SIG_NET_GRU1_OUT_SIZE+SIG_NET_GRU2_OUT_SIZE+SIG_NET_GRU3_OUT_SIZE+SIG_NET_FWC0_CONV_OUT_SIZE+i] = pitch_gate[3]*pred[i+2];
129 OPUS_COPY(&skip_cat[SIG_NET_GRU1_OUT_SIZE+SIG_NET_GRU2_OUT_SIZE+SIG_NET_GRU3_OUT_SIZE+SIG_NET_FWC0_CONV_OUT_SIZE+FARGAN_SUBFRAME_SIZE], prev, FARGAN_SUBFRAME_SIZE);
130
131 compute_generic_dense(&model->sig_net_skip_dense, skip_out, skip_cat, ACTIVATION_TANH, st->arch);
132 compute_glu(&model->sig_net_skip_glu_gate, skip_out, skip_out, st->arch);
133
134 compute_generic_dense(&model->sig_net_sig_dense_out, pcm, skip_out, ACTIVATION_TANH, st->arch);
135 for (i=0;i<FARGAN_SUBFRAME_SIZE;i++) pcm[i] *= gain;
136
137 OPUS_MOVE(st->pitch_buf, &st->pitch_buf[FARGAN_SUBFRAME_SIZE], PITCH_MAX_PERIOD-FARGAN_SUBFRAME_SIZE);
138 OPUS_COPY(&st->pitch_buf[PITCH_MAX_PERIOD-FARGAN_SUBFRAME_SIZE], pcm, FARGAN_SUBFRAME_SIZE);
139 fargan_deemphasis(pcm, &st->deemph_mem);
140 }
141
fargan_cont(FARGANState * st,const float * pcm0,const float * features0)142 void fargan_cont(FARGANState *st, const float *pcm0, const float *features0)
143 {
144 int i;
145 float cond[COND_NET_FDENSE2_OUT_SIZE];
146 float x0[FARGAN_CONT_SAMPLES];
147 float dummy[FARGAN_SUBFRAME_SIZE];
148 int period=0;
149
150 /* Pre-load features. */
151 for (i=0;i<5;i++) {
152 const float *features = &features0[i*NB_FEATURES];
153 st->last_period = period;
154 period = (int)floor(.5+256./pow(2.f,((1./60.)*((features[NB_BANDS]+1.5)*60))));
155 compute_fargan_cond(st, cond, features, period);
156 }
157
158 x0[0] = 0;
159 for (i=1;i<FARGAN_CONT_SAMPLES;i++) {
160 x0[i] = pcm0[i] - FARGAN_DEEMPHASIS*pcm0[i-1];
161 }
162
163 OPUS_COPY(&st->pitch_buf[PITCH_MAX_PERIOD-FARGAN_FRAME_SIZE], x0, FARGAN_FRAME_SIZE);
164 st->cont_initialized = 1;
165
166 for (i=0;i<FARGAN_NB_SUBFRAMES;i++) {
167 run_fargan_subframe(st, dummy, &cond[i*FARGAN_COND_SIZE], st->last_period);
168 OPUS_COPY(&st->pitch_buf[PITCH_MAX_PERIOD-FARGAN_SUBFRAME_SIZE], &x0[FARGAN_FRAME_SIZE+i*FARGAN_SUBFRAME_SIZE], FARGAN_SUBFRAME_SIZE);
169 }
170 st->deemph_mem = pcm0[FARGAN_CONT_SAMPLES-1];
171 }
172
173
fargan_init(FARGANState * st)174 void fargan_init(FARGANState *st)
175 {
176 int ret;
177 OPUS_CLEAR(st, 1);
178 st->arch = opus_select_arch();
179 #ifndef USE_WEIGHTS_FILE
180 ret = init_fargan(&st->model, fargan_arrays);
181 #else
182 ret = 0;
183 #endif
184 celt_assert(ret == 0);
185 }
186
fargan_load_model(FARGANState * st,const void * data,int len)187 int fargan_load_model(FARGANState *st, const void *data, int len) {
188 WeightArray *list;
189 int ret;
190 parse_weights(&list, data, len);
191 ret = init_fargan(&st->model, list);
192 opus_free(list);
193 if (ret == 0) return 0;
194 else return -1;
195 }
196
fargan_synthesize_impl(FARGANState * st,float * pcm,const float * features)197 static void fargan_synthesize_impl(FARGANState *st, float *pcm, const float *features)
198 {
199 int subframe;
200 float cond[COND_NET_FDENSE2_OUT_SIZE];
201 int period;
202 celt_assert(st->cont_initialized);
203
204 period = (int)floor(.5+256./pow(2.f,((1./60.)*((features[NB_BANDS]+1.5)*60))));
205 compute_fargan_cond(st, cond, features, period);
206 for (subframe=0;subframe<FARGAN_NB_SUBFRAMES;subframe++) {
207 float *sub_cond;
208 sub_cond = &cond[subframe*FARGAN_COND_SIZE];
209 run_fargan_subframe(st, &pcm[subframe*FARGAN_SUBFRAME_SIZE], sub_cond, st->last_period);
210 }
211 st->last_period = period;
212 }
213
fargan_synthesize(FARGANState * st,float * pcm,const float * features)214 void fargan_synthesize(FARGANState *st, float *pcm, const float *features)
215 {
216 fargan_synthesize_impl(st, pcm, features);
217 }
218
fargan_synthesize_int(FARGANState * st,opus_int16 * pcm,const float * features)219 void fargan_synthesize_int(FARGANState *st, opus_int16 *pcm, const float *features)
220 {
221 int i;
222 float fpcm[FARGAN_FRAME_SIZE];
223 fargan_synthesize(st, fpcm, features);
224 for (i=0;i<LPCNET_FRAME_SIZE;i++) pcm[i] = (int)floor(.5 + MIN32(32767, MAX32(-32767, 32768.f*fpcm[i])));
225 }
226