summaryrefslogtreecommitdiffstats
path: root/libavcodec/sipr16k.c
blob: fbf749759c7f0fbc6a87eb7eed75a9ca296c08db (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
/*
 * SIPR decoder for the 16k mode
 *
 * Copyright (c) 2008 Vladimir Voroshilov
 * Copyright (c) 2009 Vitor Sessak
 *
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * FFmpeg is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with FFmpeg; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <math.h>

#include "sipr.h"
#include "libavutil/common.h"
#include "libavutil/float_dsp.h"
#include "libavutil/mathematics.h"
#include "lsp.h"
#include "celp_filters.h"
#include "acelp_vectors.h"
#include "acelp_pitch_delay.h"
#include "acelp_filters.h"
#include "celp_filters.h"

#include "sipr16kdata.h"

/**
 * Convert an lsf vector into an lsp vector.
 *
 * @param lsf               input lsf vector
 * @param lsp               output lsp vector
 */
static void lsf2lsp(const float *lsf, double *lsp)
{
    int i;

    for (i = 0; i < LP_FILTER_ORDER_16k; i++)
        lsp[i] = cosf(lsf[i]);
}

static void dequant(float *out, const int *idx, const float *cbs[])
{
    int i;

    for (i = 0; i < 4; i++)
        memcpy(out + 3*i, cbs[i] + 3*idx[i], 3*sizeof(float));

    memcpy(out + 12, cbs[4] + 4*idx[4], 4*sizeof(float));
}

static void lsf_decode_fp_16k(float* lsf_history, float* isp_new,
                              const int* parm, int ma_pred)
{
    int i;
    float isp_q[LP_FILTER_ORDER_16k];

    dequant(isp_q, parm, lsf_codebooks_16k);

    for (i = 0; i < LP_FILTER_ORDER_16k; i++) {
        isp_new[i] = (1 - qu[ma_pred]) * isp_q[i]
                    +     qu[ma_pred]  * lsf_history[i]
                    + mean_lsf_16k[i];
    }

    memcpy(lsf_history, isp_q, LP_FILTER_ORDER_16k * sizeof(float));
}

static int dec_delay3_1st(int index)
{
    if (index < 390) {
        return index + 88;
    } else
        return 3 * index - 690;
}

static int dec_delay3_2nd(int index, int pit_min, int pit_max,
                          int pitch_lag_prev)
{
    if (index < 62) {
        int pitch_delay_min = av_clip(pitch_lag_prev - 10,
                                      pit_min, pit_max - 19);
        return 3 * pitch_delay_min + index - 2;
    } else
        return 3 * pitch_lag_prev;
}

static void postfilter(float *out_data, float* synth, float* iir_mem,
                       float* filt_mem[2], float* mem_preemph)
{
    float buf[30 + LP_FILTER_ORDER_16k];
    float *tmpbuf = buf + LP_FILTER_ORDER_16k;
    float s;
    int i;

    for (i = 0; i < LP_FILTER_ORDER_16k; i++)
        filt_mem[0][i] = iir_mem[i] * ff_pow_0_5[i];

    memcpy(tmpbuf - LP_FILTER_ORDER_16k, mem_preemph,
           LP_FILTER_ORDER_16k*sizeof(*buf));

    ff_celp_lp_synthesis_filterf(tmpbuf, filt_mem[1], synth, 30,
                                 LP_FILTER_ORDER_16k);

    memcpy(synth - LP_FILTER_ORDER_16k, mem_preemph,
           LP_FILTER_ORDER_16k * sizeof(*synth));

    ff_celp_lp_synthesis_filterf(synth, filt_mem[0], synth, 30,
                                 LP_FILTER_ORDER_16k);

    memcpy(out_data + 30 - LP_FILTER_ORDER_16k,
           synth    + 30 - LP_FILTER_ORDER_16k,
           LP_FILTER_ORDER_16k * sizeof(*synth));

    ff_celp_lp_synthesis_filterf(out_data + 30, filt_mem[0],
                                 synth + 30, 2 * L_SUBFR_16k - 30,
                                 LP_FILTER_ORDER_16k);


    memcpy(mem_preemph, out_data + 2*L_SUBFR_16k - LP_FILTER_ORDER_16k,
           LP_FILTER_ORDER_16k * sizeof(*synth));

    FFSWAP(float *, filt_mem[0], filt_mem[1]);
    for (i = 0, s = 0; i < 30; i++, s += 1.0/30)
        out_data[i] = tmpbuf[i] + s * (synth[i] - tmpbuf[i]);
}

/**
 * Floating point version of ff_acelp_lp_decode().
 */
static void acelp_lp_decodef(float *lp_1st, float *lp_2nd,
                             const double *lsp_2nd, const double *lsp_prev)
{
    double lsp_1st[LP_FILTER_ORDER_16k];
    int i;

    /* LSP values for first subframe (3.2.5 of G.729, Equation 24) */
    for (i = 0; i < LP_FILTER_ORDER_16k; i++)
        lsp_1st[i] = (lsp_2nd[i] + lsp_prev[i]) * 0.5;

    ff_acelp_lspd2lpc(lsp_1st, lp_1st, LP_FILTER_ORDER_16k >> 1);

    /* LSP values for second subframe (3.2.5 of G.729) */
    ff_acelp_lspd2lpc(lsp_2nd, lp_2nd, LP_FILTER_ORDER_16k >> 1);
}

/**
 * Floating point version of ff_acelp_decode_gain_code().
 */
static float acelp_decode_gain_codef(float gain_corr_factor, const float *fc_v,
                                     float mr_energy, const float *quant_energy,
                                     const float *ma_prediction_coeff,
                                     int subframe_size, int ma_pred_order)
{
    mr_energy += avpriv_scalarproduct_float_c(quant_energy, ma_prediction_coeff,
                                              ma_pred_order);

    mr_energy = gain_corr_factor * exp(M_LN10 / 20. * mr_energy) /
        sqrt((0.01 + avpriv_scalarproduct_float_c(fc_v, fc_v, subframe_size)));
    return mr_energy;
}

#define DIVIDE_BY_3(x) ((x) * 10923 >> 15)

void ff_sipr_decode_frame_16k(SiprContext *ctx, SiprParameters *params,
                              float *out_data)
{
    int frame_size = SUBFRAME_COUNT_16k * L_SUBFR_16k;
    float *synth = ctx->synth_buf + LP_FILTER_ORDER_16k;
    float lsf_new[LP_FILTER_ORDER_16k];
    double lsp_new[LP_FILTER_ORDER_16k];
    float Az[2][LP_FILTER_ORDER_16k];
    float fixed_vector[L_SUBFR_16k];
    float pitch_fac, gain_code;

    int i;
    int pitch_delay_3x;

    float *excitation = ctx->excitation + 292;

    lsf_decode_fp_16k(ctx->lsf_history, lsf_new, params->vq_indexes,
                      params->ma_pred_switch);

    ff_set_min_dist_lsf(lsf_new, LSFQ_DIFF_MIN / 2, LP_FILTER_ORDER_16k);

    lsf2lsp(lsf_new, lsp_new);

    acelp_lp_decodef(Az[0], Az[1], lsp_new, ctx->lsp_history_16k);

    memcpy(ctx->lsp_history_16k, lsp_new, LP_FILTER_ORDER_16k * sizeof(double));

    memcpy(synth - LP_FILTER_ORDER_16k, ctx->synth,
           LP_FILTER_ORDER_16k * sizeof(*synth));

    for (i = 0; i < SUBFRAME_COUNT_16k; i++) {
        int i_subfr = i * L_SUBFR_16k;
        AMRFixed f;
        float gain_corr_factor;
        int pitch_delay_int;
        int pitch_delay_frac;

        if (!i) {
            pitch_delay_3x = dec_delay3_1st(params->pitch_delay[i]);
        } else
            pitch_delay_3x = dec_delay3_2nd(params->pitch_delay[i],
                                            PITCH_MIN, PITCH_MAX,
                                            ctx->pitch_lag_prev);

        pitch_fac = gain_pitch_cb_16k[params->gp_index[i]];
        f.pitch_fac = FFMIN(pitch_fac, 1.0);
        f.pitch_lag = DIVIDE_BY_3(pitch_delay_3x+1);
        ctx->pitch_lag_prev = f.pitch_lag;

        pitch_delay_int  = DIVIDE_BY_3(pitch_delay_3x + 2);
        pitch_delay_frac = pitch_delay_3x + 2 - 3*pitch_delay_int;

        ff_acelp_interpolatef(&excitation[i_subfr],
                              &excitation[i_subfr] - pitch_delay_int + 1,
                              sinc_win, 3, pitch_delay_frac + 1,
                              LP_FILTER_ORDER, L_SUBFR_16k);


        memset(fixed_vector, 0, sizeof(fixed_vector));

        ff_decode_10_pulses_35bits(params->fc_indexes[i], &f,
                                   ff_fc_4pulses_8bits_tracks_13, 5, 4);

        ff_set_fixed_vector(fixed_vector, &f, 1.0, L_SUBFR_16k);

        gain_corr_factor = gain_cb_16k[params->gc_index[i]];
        gain_code = gain_corr_factor *
            acelp_decode_gain_codef(sqrt(L_SUBFR_16k), fixed_vector,
                                    19.0 - 15.0/(0.05*M_LN10/M_LN2),
                                    pred_16k, ctx->energy_history,
                                    L_SUBFR_16k, 2);

        ctx->energy_history[1] = ctx->energy_history[0];
        ctx->energy_history[0] = 20.0 * log10f(gain_corr_factor);

        ff_weighted_vector_sumf(&excitation[i_subfr], &excitation[i_subfr],
                                fixed_vector, pitch_fac,
                                gain_code, L_SUBFR_16k);

        ff_celp_lp_synthesis_filterf(synth + i_subfr, Az[i],
                                     &excitation[i_subfr], L_SUBFR_16k,
                                     LP_FILTER_ORDER_16k);

    }
    memcpy(ctx->synth, synth + frame_size - LP_FILTER_ORDER_16k,
           LP_FILTER_ORDER_16k * sizeof(*synth));

    memmove(ctx->excitation, ctx->excitation + 2 * L_SUBFR_16k,
            (L_INTERPOL+PITCH_MAX) * sizeof(float));

    postfilter(out_data, synth, ctx->iir_mem, ctx->filt_mem, ctx->mem_preemph);

    memcpy(ctx->iir_mem, Az[1], LP_FILTER_ORDER_16k * sizeof(float));
}

void ff_sipr_init_16k(SiprContext *ctx)
{
    int i;

    for (i = 0; i < LP_FILTER_ORDER_16k; i++)
        ctx->lsp_history_16k[i] = cos((i + 1) * M_PI/(LP_FILTER_ORDER_16k + 1));

    ctx->filt_mem[0] = ctx->filt_buf[0];
    ctx->filt_mem[1] = ctx->filt_buf[1];

    ctx->pitch_lag_prev = 180;
}
OpenPOWER on IntegriCloud