dsputil: template get_pixels() for different bit depths
[ffmpeg.git] / libavcodec / sipr16k.c
1 /*
2  * SIPR decoder for the 16k mode
3  *
4  * Copyright (c) 2008 Vladimir Voroshilov
5  * Copyright (c) 2009 Vitor Sessak
6  *
7  * This file is part of Libav.
8  *
9  * Libav is free software; you can redistribute it and/or
10  * modify it under the terms of the GNU Lesser General Public
11  * License as published by the Free Software Foundation; either
12  * version 2.1 of the License, or (at your option) any later version.
13  *
14  * Libav is distributed in the hope that it will be useful,
15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
17  * Lesser General Public License for more details.
18  *
19  * You should have received a copy of the GNU Lesser General Public
20  * License along with Libav; if not, write to the Free Software
21  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22  */
23
24 #include <math.h>
25
26 #include "sipr.h"
27 #include "libavutil/mathematics.h"
28 #include "lsp.h"
29 #include "celp_math.h"
30 #include "acelp_vectors.h"
31 #include "acelp_pitch_delay.h"
32 #include "acelp_filters.h"
33 #include "celp_filters.h"
34
35 #include "sipr16kdata.h"
36
37 /**
38  * Convert an lsf vector into an lsp vector.
39  *
40  * @param lsf               input lsf vector
41  * @param lsp               output lsp vector
42  */
43 static void lsf2lsp(const float *lsf, double *lsp)
44 {
45     int i;
46
47     for (i = 0; i < LP_FILTER_ORDER_16k; i++)
48         lsp[i] = cosf(lsf[i]);
49 }
50
51 static void dequant(float *out, const int *idx, const float *cbs[])
52 {
53     int i;
54
55     for (i = 0; i < 4; i++)
56         memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float));
57
58     memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float));
59 }
60
61 static void lsf_decode_fp_16k(float* lsf_history, float* isp_new,
62                               const int* parm, int ma_pred)
63 {
64     int i;
65     float isp_q[LP_FILTER_ORDER_16k];
66
67     dequant(isp_q, parm, lsf_codebooks_16k);
68
69     for (i = 0; i < LP_FILTER_ORDER_16k; i++) {
70         isp_new[i] = (1 - qu[ma_pred]) * isp_q[i]
71                     +     qu[ma_pred]  * lsf_history[i]
72                     + mean_lsf_16k[i];
73     }
74
75     memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float));
76 }
77
78 static int dec_delay3_1st(int index)
79 {
80     if (index < 390) {
81         return index + 88;
82     } else
83         return 3 * index - 690;
84 }
85
86 static int dec_delay3_2nd(int index, int pit_min, int pit_max,
87                           int pitch_lag_prev)
88 {
89     if (index < 62) {
90         int pitch_delay_min = av_clip(pitch_lag_prev - 10,
91                                       pit_min, pit_max - 19);
92         return 3 * pitch_delay_min + index - 2;
93     } else
94         return 3 * pitch_lag_prev;
95 }
96
97 static void postfilter(float *out_data, float* synth, float* iir_mem,
98                        float* filt_mem[2], float* mem_preemph)
99 {
100     float buf[30 + LP_FILTER_ORDER_16k];
101     float *tmpbuf = buf + LP_FILTER_ORDER_16k;
102     float s;
103     int i;
104
105     for (i = 0; i < LP_FILTER_ORDER_16k; i++)
106         filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i];
107
108     memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph,
109            LP_FILTER_ORDER_16k*sizeof(*buf));
110
111     ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
112                                  LP_FILTER_ORDER_16k);
113
114     memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph,
115            LP_FILTER_ORDER_16k * sizeof(*synth));
116
117     ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30,
118                                  LP_FILTER_ORDER_16k);
119
120     memcpy(out_data + 30 - LP_FILTER_ORDER_16k,
121            synth    + 30 - LP_FILTER_ORDER_16k,
122            LP_FILTER_ORDER_16k * sizeof(*synth));
123
124     ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0],
125                                  synth + 30, 2 * L_SUBFR_16k - 30,
126                                  LP_FILTER_ORDER_16k);
127
128
129     memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k,
130            LP_FILTER_ORDER_16k * sizeof(*synth));
131
132     FFSWAP(float *, filt_mem[0], filt_mem[1]);
133     for (i = 0, s = 0; i < 30; i++, s += 1.0/30)
134         out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]);
135 }
136
137 /**
138  * Floating point version of ff_acelp_lp_decode().
139  */
140 static void acelp_lp_decodef(float *lp_1st, float *lp_2nd,
141                              const double *lsp_2nd, const double *lsp_prev)
142 {
143     double lsp_1st[LP_FILTER_ORDER_16k];
144     int i;
145
146     /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */
147     for (i = 0; i < LP_FILTER_ORDER_16k; i++)
148         lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5;
149
150     ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1);
151
152     /* LSP values for second subframe (3.2.5 of G.729) */
153     ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1);
154 }
155
156 /**
157  * Floating point version of ff_acelp_decode_gain_code().
158  */
159 static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v,
160                                      float mr_energy, const float *quant_energy,
161                                      const float *ma_prediction_coeff,
162                                      int subframe_size, int ma_pred_order)
163 {
164     mr_energy +=
165         ff_dot_productf(quant_energy, ma_prediction_coeff, ma_pred_order);
166
167     mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) /
168         sqrt((0.01 + ff_dot_productf(fc_v, fc_v, subframe_size)));
169     return mr_energy;
170 }
171
172 #define DIVIDE_BY_3(x) ((x) * 10923 >> 15)
173
174 void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
175                               float *out_data)
176 {
177     int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k;
178     float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k;
179     float lsf_new[LP_FILTER_ORDER_16k];
180     double lsp_new[LP_FILTER_ORDER_16k];
181     float Az[2][LP_FILTER_ORDER_16k];
182     float fixed_vector[L_SUBFR_16k];
183     float pitch_fac, gain_code;
184
185     int i;
186     int pitch_delay_3x;
187
188     float *excitation = ctx->excitation + 292;
189
190     lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes,
191                       params->ma_pred_switch);
192
193     ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k);
194
195     lsf2lsp(lsf_new, lsp_new);
196
197     acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k);
198
199     memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double));
200
201     memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth,
202            LP_FILTER_ORDER_16k * sizeof(*synth));
203
204     for (i = 0; i < SUBFRAME_COUNT_16k; i++) {
205         int i_subfr = i * L_SUBFR_16k;
206         AMRFixed f;
207         float gain_corr_factor;
208         int pitch_delay_int;
209         int pitch_delay_frac;
210
211         if (!i) {
212             pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]);
213         } else
214             pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i],
215                                             PITCH_MIN, PITCH_MAX,
216                                             ctx->pitch_lag_prev);
217
218         pitch_fac = gain_pitch_cb_16k[params->gp_index[i]];
219         f.pitch_fac = FFMIN(pitch_fac, 1.0);
220         f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1);
221         ctx->pitch_lag_prev = f.pitch_lag;
222
223         pitch_delay_int  = DIVIDE_BY_3(pitch_delay_3x + 2);
224         pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int;
225
226         ff_acelp_interpolatef(&excitation[i_subfr],
227                               &excitation[i_subfr] - pitch_delay_int + 1,
228                               sinc_win, 3, pitch_delay_frac + 1,
229                               LP_FILTER_ORDER, L_SUBFR_16k);
230
231
232         memset(fixed_vector, 0, sizeof(fixed_vector));
233
234         ff_decode_10_pulses_35bits(params->fc_indexes[i], &f,
235                                    ff_fc_4pulses_8bits_tracks_13, 5, 4);
236
237         ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k);
238
239         gain_corr_factor = gain_cb_16k[params->gc_index[i]];
240         gain_code = gain_corr_factor *
241             acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector,
242                                     19.0 - 15.0/(0.05*M_LN10/M_LN2),
243                                     pred_16k, ctx->energy_history,
244                                     L_SUBFR_16k, 2);
245
246         ctx->energy_history[1] = ctx->energy_history[0];
247         ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor);
248
249         ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr],
250                                 fixed_vector, pitch_fac,
251                                 gain_code, L_SUBFR_16k);
252
253         ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i],
254                                      &excitation[i_subfr], L_SUBFR_16k,
255                                      LP_FILTER_ORDER_16k);
256
257     }
258     memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k,
259            LP_FILTER_ORDER_16k * sizeof(*synth));
260
261     memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k,
262             (L_INTERPOL+PITCH_MAX) * sizeof(float));
263
264     postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph);
265
266     memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float));
267 }
268
269 void ff_sipr_init_16k(SiprContext *ctx)
270 {
271     int i;
272
273     for (i = 0; i < LP_FILTER_ORDER_16k; i++)
274         ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1));
275
276     ctx->filt_mem[0] = ctx->filt_buf[0];
277     ctx->filt_mem[1] = ctx->filt_buf[1];
278
279     ctx->pitch_lag_prev = 180;
280 }