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1
/*
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 * AAC Spectral Band Replication decoding functions
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 * Copyright (c) 2008-2009 Robert Swain ( rob opendot cl )
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 * Copyright (c) 2009-2010 Alex Converse <alex.converse@gmail.com>
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
22

    
23
/**
24
 * @file libavcodec/aacsbr.c
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 * AAC Spectral Band Replication decoding functions
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 * @author Robert Swain ( rob opendot cl )
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 */
28

    
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#include "aac.h"
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#include "sbr.h"
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#include "aacsbr.h"
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#include "aacsbrdata.h"
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#include "fft.h"
34

    
35
#include <stdint.h>
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#include <float.h>
37

    
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#define ENVELOPE_ADJUSTMENT_OFFSET 2
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#define NOISE_FLOOR_OFFSET 6.0f
40

    
41
/**
42
 * SBR VLC tables
43
 */
44
enum {
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    T_HUFFMAN_ENV_1_5DB,
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    F_HUFFMAN_ENV_1_5DB,
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    T_HUFFMAN_ENV_BAL_1_5DB,
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    F_HUFFMAN_ENV_BAL_1_5DB,
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    T_HUFFMAN_ENV_3_0DB,
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    F_HUFFMAN_ENV_3_0DB,
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    T_HUFFMAN_ENV_BAL_3_0DB,
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    F_HUFFMAN_ENV_BAL_3_0DB,
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    T_HUFFMAN_NOISE_3_0DB,
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    T_HUFFMAN_NOISE_BAL_3_0DB,
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};
56

    
57
/**
58
 * bs_frame_class - frame class of current SBR frame (14496-3 sp04 p98)
59
 */
60
enum {
61
    FIXFIX,
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    FIXVAR,
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    VARFIX,
64
    VARVAR,
65
};
66

    
67
enum {
68
    EXTENSION_ID_PS = 2,
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};
70

    
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static VLC vlc_sbr[10];
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static const int8_t vlc_sbr_lav[10] =
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    { 60, 60, 24, 24, 31, 31, 12, 12, 31, 12 };
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static DECLARE_ALIGNED(16, float, analysis_cos_pre)[64];
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static DECLARE_ALIGNED(16, float, analysis_sin_pre)[64];
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static DECLARE_ALIGNED(16, float, analysis_cossin_post)[32][2];
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static const DECLARE_ALIGNED(16, float, zero64)[64];
78

    
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#define SBR_INIT_VLC_STATIC(num, size) \
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    INIT_VLC_STATIC(&vlc_sbr[num], 9, sbr_tmp[num].table_size / sbr_tmp[num].elem_size,     \
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                    sbr_tmp[num].sbr_bits ,                      1,                      1, \
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                    sbr_tmp[num].sbr_codes, sbr_tmp[num].elem_size, sbr_tmp[num].elem_size, \
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                    size)
84

    
85
#define SBR_VLC_ROW(name) \
86
    { name ## _codes, name ## _bits, sizeof(name ## _codes), sizeof(name ## _codes[0]) }
87

    
88
av_cold void ff_aac_sbr_init(void)
89
{
90
    int n, k;
91
    static const struct {
92
        const void *sbr_codes, *sbr_bits;
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        const unsigned int table_size, elem_size;
94
    } sbr_tmp[] = {
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        SBR_VLC_ROW(t_huffman_env_1_5dB),
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        SBR_VLC_ROW(f_huffman_env_1_5dB),
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        SBR_VLC_ROW(t_huffman_env_bal_1_5dB),
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        SBR_VLC_ROW(f_huffman_env_bal_1_5dB),
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        SBR_VLC_ROW(t_huffman_env_3_0dB),
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        SBR_VLC_ROW(f_huffman_env_3_0dB),
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        SBR_VLC_ROW(t_huffman_env_bal_3_0dB),
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        SBR_VLC_ROW(f_huffman_env_bal_3_0dB),
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        SBR_VLC_ROW(t_huffman_noise_3_0dB),
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        SBR_VLC_ROW(t_huffman_noise_bal_3_0dB),
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    };
106

    
107
    // SBR VLC table initialization
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    SBR_INIT_VLC_STATIC(0, 1098);
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    SBR_INIT_VLC_STATIC(1, 1092);
110
    SBR_INIT_VLC_STATIC(2, 768);
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    SBR_INIT_VLC_STATIC(3, 1026);
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    SBR_INIT_VLC_STATIC(4, 1058);
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    SBR_INIT_VLC_STATIC(5, 1052);
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    SBR_INIT_VLC_STATIC(6, 544);
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    SBR_INIT_VLC_STATIC(7, 544);
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    SBR_INIT_VLC_STATIC(8, 592);
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    SBR_INIT_VLC_STATIC(9, 512);
118

    
119
    for (n = 0; n < 64; n++) {
120
        float pre = M_PI * n / 64;
121
        analysis_cos_pre[n] = cosf(pre);
122
        analysis_sin_pre[n] = sinf(pre);
123
    }
124
    for (k = 0; k < 32; k++) {
125
        float post = M_PI * (k + 0.5) / 128;
126
        analysis_cossin_post[k][0] =  4.0 * cosf(post);
127
        analysis_cossin_post[k][1] = -4.0 * sinf(post);
128
    }
129
    for (n = 1; n < 320; n++)
130
        sbr_qmf_window_us[320 + n] = sbr_qmf_window_us[320 - n];
131
    sbr_qmf_window_us[384] = -sbr_qmf_window_us[384];
132
    sbr_qmf_window_us[512] = -sbr_qmf_window_us[512];
133

    
134
    for (n = 0; n < 320; n++)
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        sbr_qmf_window_ds[n] = sbr_qmf_window_us[2*n];
136
}
137

    
138
av_cold void ff_aac_sbr_ctx_init(SpectralBandReplication *sbr)
139
{
140
    sbr->kx[0] = sbr->kx[1] = 32; //Typo in spec, kx' inits to 32
141
    sbr->data[0].e_a[1] = sbr->data[1].e_a[1] = -1;
142
    sbr->data[0].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
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    sbr->data[1].synthesis_filterbank_samples_offset = SBR_SYNTHESIS_BUF_SIZE - (1280 - 128);
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    ff_mdct_init(&sbr->mdct, 7, 1, 1.0/64);
145
    ff_rdft_init(&sbr->rdft, 6, IDFT_R2C);
146
}
147

    
148
av_cold void ff_aac_sbr_ctx_close(SpectralBandReplication *sbr)
149
{
150
    ff_mdct_end(&sbr->mdct);
151
    ff_rdft_end(&sbr->rdft);
152
}
153

    
154
static int qsort_comparison_function_int16(const void *a, const void *b)
155
{
156
    return *(const int16_t *)a - *(const int16_t *)b;
157
}
158

    
159
static inline int in_table_int16(const int16_t *table, int last_el, int16_t needle)
160
{
161
    int i;
162
    for (i = 0; i <= last_el; i++)
163
        if (table[i] == needle)
164
            return 1;
165
    return 0;
166
}
167

    
168
/// Limiter Frequency Band Table (14496-3 sp04 p198)
169
static void sbr_make_f_tablelim(SpectralBandReplication *sbr)
170
{
171
    int k;
172
    if (sbr->bs_limiter_bands > 0) {
173
        static const float bands_warped[3] = { 1.32715174233856803909f,   //2^(0.49/1.2)
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                                               1.18509277094158210129f,   //2^(0.49/2)
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                                               1.11987160404675912501f }; //2^(0.49/3)
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        const float lim_bands_per_octave_warped = bands_warped[sbr->bs_limiter_bands - 1];
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        int16_t patch_borders[5];
178
        uint16_t *in = sbr->f_tablelim + 1, *out = sbr->f_tablelim;
179

    
180
        patch_borders[0] = sbr->kx[1];
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        for (k = 1; k <= sbr->num_patches; k++)
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            patch_borders[k] = patch_borders[k-1] + sbr->patch_num_subbands[k-1];
183

    
184
        memcpy(sbr->f_tablelim, sbr->f_tablelow,
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               (sbr->n[0] + 1) * sizeof(sbr->f_tablelow[0]));
186
        if (sbr->num_patches > 1)
187
            memcpy(sbr->f_tablelim + sbr->n[0] + 1, patch_borders + 1,
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                   (sbr->num_patches - 1) * sizeof(patch_borders[0]));
189

    
190
        qsort(sbr->f_tablelim, sbr->num_patches + sbr->n[0],
191
              sizeof(sbr->f_tablelim[0]),
192
              qsort_comparison_function_int16);
193

    
194
        sbr->n_lim = sbr->n[0] + sbr->num_patches - 1;
195
        while (out < sbr->f_tablelim + sbr->n_lim) {
196
            if (*in >= *out * lim_bands_per_octave_warped) {
197
                *++out = *in++;
198
            } else if (*in == *out ||
199
                !in_table_int16(patch_borders, sbr->num_patches, *in)) {
200
                in++;
201
                sbr->n_lim--;
202
            } else if (!in_table_int16(patch_borders, sbr->num_patches, *out)) {
203
                *out = *in++;
204
                sbr->n_lim--;
205
            } else {
206
                *++out = *in++;
207
            }
208
        }
209
    } else {
210
        sbr->f_tablelim[0] = sbr->f_tablelow[0];
211
        sbr->f_tablelim[1] = sbr->f_tablelow[sbr->n[0]];
212
        sbr->n_lim = 1;
213
    }
214
}
215

    
216
static unsigned int read_sbr_header(SpectralBandReplication *sbr, GetBitContext *gb)
217
{
218
    unsigned int cnt = get_bits_count(gb);
219
    uint8_t bs_header_extra_1;
220
    uint8_t bs_header_extra_2;
221
    int old_bs_limiter_bands = sbr->bs_limiter_bands;
222
    SpectrumParameters old_spectrum_params;
223

    
224
    sbr->start = 1;
225

    
226
    // Save last spectrum parameters variables to compare to new ones
227
    memcpy(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters));
228

    
229
    sbr->bs_amp_res_header              = get_bits1(gb);
230
    sbr->spectrum_params.bs_start_freq  = get_bits(gb, 4);
231
    sbr->spectrum_params.bs_stop_freq   = get_bits(gb, 4);
232
    sbr->spectrum_params.bs_xover_band  = get_bits(gb, 3);
233
                                          skip_bits(gb, 2); // bs_reserved
234

    
235
    bs_header_extra_1 = get_bits1(gb);
236
    bs_header_extra_2 = get_bits1(gb);
237

    
238
    if (bs_header_extra_1) {
239
        sbr->spectrum_params.bs_freq_scale  = get_bits(gb, 2);
240
        sbr->spectrum_params.bs_alter_scale = get_bits1(gb);
241
        sbr->spectrum_params.bs_noise_bands = get_bits(gb, 2);
242
    } else {
243
        sbr->spectrum_params.bs_freq_scale  = 2;
244
        sbr->spectrum_params.bs_alter_scale = 1;
245
        sbr->spectrum_params.bs_noise_bands = 2;
246
    }
247

    
248
    // Check if spectrum parameters changed
249
    if (memcmp(&old_spectrum_params, &sbr->spectrum_params, sizeof(SpectrumParameters)))
250
        sbr->reset = 1;
251

    
252
    if (bs_header_extra_2) {
253
        sbr->bs_limiter_bands  = get_bits(gb, 2);
254
        sbr->bs_limiter_gains  = get_bits(gb, 2);
255
        sbr->bs_interpol_freq  = get_bits1(gb);
256
        sbr->bs_smoothing_mode = get_bits1(gb);
257
    } else {
258
        sbr->bs_limiter_bands  = 2;
259
        sbr->bs_limiter_gains  = 2;
260
        sbr->bs_interpol_freq  = 1;
261
        sbr->bs_smoothing_mode = 1;
262
    }
263

    
264
    if (sbr->bs_limiter_bands != old_bs_limiter_bands && !sbr->reset)
265
        sbr_make_f_tablelim(sbr);
266

    
267
    return get_bits_count(gb) - cnt;
268
}
269

    
270
static int array_min_int16(const int16_t *array, int nel)
271
{
272
    int i, min = array[0];
273
    for (i = 1; i < nel; i++)
274
        min = FFMIN(array[i], min);
275
    return min;
276
}
277

    
278
static void make_bands(int16_t* bands, int start, int stop, int num_bands)
279
{
280
    int k, previous, present;
281
    float base, prod;
282

    
283
    base = powf((float)stop / start, 1.0f / num_bands);
284
    prod = start;
285
    previous = start;
286

    
287
    for (k = 0; k < num_bands-1; k++) {
288
        prod *= base;
289
        present  = lrintf(prod);
290
        bands[k] = present - previous;
291
        previous = present;
292
    }
293
    bands[num_bands-1] = stop - previous;
294
}
295

    
296
static int check_n_master(AVCodecContext *avccontext, int n_master, int bs_xover_band)
297
{
298
    // Requirements (14496-3 sp04 p205)
299
    if (n_master <= 0) {
300
        av_log(avccontext, AV_LOG_ERROR, "Invalid n_master: %d\n", n_master);
301
        return -1;
302
    }
303
    if (bs_xover_band >= n_master) {
304
        av_log(avccontext, AV_LOG_ERROR,
305
               "Invalid bitstream, crossover band index beyond array bounds: %d\n",
306
               bs_xover_band);
307
        return -1;
308
    }
309
    return 0;
310
}
311

    
312
/// Master Frequency Band Table (14496-3 sp04 p194)
313
static int sbr_make_f_master(AACContext *ac, SpectralBandReplication *sbr,
314
                             SpectrumParameters *spectrum)
315
{
316
    unsigned int temp, max_qmf_subbands;
317
    unsigned int start_min, stop_min;
318
    int k;
319
    const int8_t *sbr_offset_ptr;
320
    int16_t stop_dk[13];
321

    
322
    if (sbr->sample_rate < 32000) {
323
        temp = 3000;
324
    } else if (sbr->sample_rate < 64000) {
325
        temp = 4000;
326
    } else
327
        temp = 5000;
328

    
329
    start_min = ((temp << 7) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
330
    stop_min  = ((temp << 8) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
331

    
332
    switch (sbr->sample_rate) {
333
    case 16000:
334
        sbr_offset_ptr = sbr_offset[0];
335
        break;
336
    case 22050:
337
        sbr_offset_ptr = sbr_offset[1];
338
        break;
339
    case 24000:
340
        sbr_offset_ptr = sbr_offset[2];
341
        break;
342
    case 32000:
343
        sbr_offset_ptr = sbr_offset[3];
344
        break;
345
    case 44100: case 48000: case 64000:
346
        sbr_offset_ptr = sbr_offset[4];
347
        break;
348
    case 88200: case 96000: case 128000: case 176400: case 192000:
349
        sbr_offset_ptr = sbr_offset[5];
350
        break;
351
    default:
352
        av_log(ac->avccontext, AV_LOG_ERROR,
353
               "Unsupported sample rate for SBR: %d\n", sbr->sample_rate);
354
        return -1;
355
    }
356

    
357
    sbr->k[0] = start_min + sbr_offset_ptr[spectrum->bs_start_freq];
358

    
359
    if (spectrum->bs_stop_freq < 14) {
360
        sbr->k[2] = stop_min;
361
        make_bands(stop_dk, stop_min, 64, 13);
362
        qsort(stop_dk, 13, sizeof(stop_dk[0]), qsort_comparison_function_int16);
363
        for (k = 0; k < spectrum->bs_stop_freq; k++)
364
            sbr->k[2] += stop_dk[k];
365
    } else if (spectrum->bs_stop_freq == 14) {
366
        sbr->k[2] = 2*sbr->k[0];
367
    } else if (spectrum->bs_stop_freq == 15) {
368
        sbr->k[2] = 3*sbr->k[0];
369
    } else {
370
        av_log(ac->avccontext, AV_LOG_ERROR,
371
               "Invalid bs_stop_freq: %d\n", spectrum->bs_stop_freq);
372
        return -1;
373
    }
374
    sbr->k[2] = FFMIN(64, sbr->k[2]);
375

    
376
    // Requirements (14496-3 sp04 p205)
377
    if (sbr->sample_rate <= 32000) {
378
        max_qmf_subbands = 48;
379
    } else if (sbr->sample_rate == 44100) {
380
        max_qmf_subbands = 35;
381
    } else if (sbr->sample_rate >= 48000)
382
        max_qmf_subbands = 32;
383

    
384
    if (sbr->k[2] - sbr->k[0] > max_qmf_subbands) {
385
        av_log(ac->avccontext, AV_LOG_ERROR,
386
               "Invalid bitstream, too many QMF subbands: %d\n", sbr->k[2] - sbr->k[0]);
387
        return -1;
388
    }
389

    
390
    if (!spectrum->bs_freq_scale) {
391
        unsigned int dk;
392
        int k2diff;
393

    
394
        dk = spectrum->bs_alter_scale + 1;
395
        sbr->n_master = ((sbr->k[2] - sbr->k[0] + (dk&2)) >> dk) << 1;
396
        if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
397
            return -1;
398

    
399
        for (k = 1; k <= sbr->n_master; k++)
400
            sbr->f_master[k] = dk;
401

    
402
        k2diff = sbr->k[2] - sbr->k[0] - sbr->n_master * dk;
403
        if (k2diff < 0) {
404
            sbr->f_master[1]--;
405
            sbr->f_master[2]-= (k2diff < 1);
406
        } else if (k2diff) {
407
            sbr->f_master[sbr->n_master]++;
408
        }
409

    
410
        sbr->f_master[0] = sbr->k[0];
411
        for (k = 1; k <= sbr->n_master; k++)
412
            sbr->f_master[k] += sbr->f_master[k - 1];
413

    
414
    } else {
415
        int half_bands = 7 - spectrum->bs_freq_scale;      // bs_freq_scale  = {1,2,3}
416
        int two_regions, num_bands_0;
417
        int vdk0_max, vdk1_min;
418
        int16_t vk0[49];
419

    
420
        if (49 * sbr->k[2] > 110 * sbr->k[0]) {
421
            two_regions = 1;
422
            sbr->k[1] = 2 * sbr->k[0];
423
        } else {
424
            two_regions = 0;
425
            sbr->k[1] = sbr->k[2];
426
        }
427

    
428
        num_bands_0 = lrintf(half_bands * log2f(sbr->k[1] / (float)sbr->k[0])) * 2;
429

    
430
        if (num_bands_0 <= 0) { // Requirements (14496-3 sp04 p205)
431
            av_log(ac->avccontext, AV_LOG_ERROR, "Invalid num_bands_0: %d\n", num_bands_0);
432
            return -1;
433
        }
434

    
435
        vk0[0] = 0;
436

    
437
        make_bands(vk0+1, sbr->k[0], sbr->k[1], num_bands_0);
438

    
439
        qsort(vk0 + 1, num_bands_0, sizeof(vk0[1]), qsort_comparison_function_int16);
440
        vdk0_max = vk0[num_bands_0];
441

    
442
        vk0[0] = sbr->k[0];
443
        for (k = 1; k <= num_bands_0; k++) {
444
            if (vk0[k] <= 0) { // Requirements (14496-3 sp04 p205)
445
                av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk0[%d]: %d\n", k, vk0[k]);
446
                return -1;
447
            }
448
            vk0[k] += vk0[k-1];
449
        }
450

    
451
        if (two_regions) {
452
            int16_t vk1[49];
453
            float invwarp = spectrum->bs_alter_scale ? 0.76923076923076923077f
454
                                                     : 1.0f; // bs_alter_scale = {0,1}
455
            int num_bands_1 = lrintf(half_bands * invwarp *
456
                                     log2f(sbr->k[2] / (float)sbr->k[1])) * 2;
457

    
458
            make_bands(vk1+1, sbr->k[1], sbr->k[2], num_bands_1);
459

    
460
            vdk1_min = array_min_int16(vk1 + 1, num_bands_1);
461

    
462
            if (vdk1_min < vdk0_max) {
463
                int change;
464
                qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
465
                change = FFMIN(vdk0_max - vk1[1], (vk1[num_bands_1] - vk1[1]) >> 1);
466
                vk1[1]           += change;
467
                vk1[num_bands_1] -= change;
468
            }
469

    
470
            qsort(vk1 + 1, num_bands_1, sizeof(vk1[1]), qsort_comparison_function_int16);
471

    
472
            vk1[0] = sbr->k[1];
473
            for (k = 1; k <= num_bands_1; k++) {
474
                if (vk1[k] <= 0) { // Requirements (14496-3 sp04 p205)
475
                    av_log(ac->avccontext, AV_LOG_ERROR, "Invalid vDk1[%d]: %d\n", k, vk1[k]);
476
                    return -1;
477
                }
478
                vk1[k] += vk1[k-1];
479
            }
480

    
481
            sbr->n_master = num_bands_0 + num_bands_1;
482
            if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
483
                return -1;
484
            memcpy(&sbr->f_master[0],               vk0,
485
                   (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
486
            memcpy(&sbr->f_master[num_bands_0 + 1], vk1 + 1,
487
                    num_bands_1      * sizeof(sbr->f_master[0]));
488

    
489
        } else {
490
            sbr->n_master = num_bands_0;
491
            if (check_n_master(ac->avccontext, sbr->n_master, sbr->spectrum_params.bs_xover_band))
492
                return -1;
493
            memcpy(sbr->f_master, vk0, (num_bands_0 + 1) * sizeof(sbr->f_master[0]));
494
        }
495
    }
496

    
497
    return 0;
498
}
499

    
500
/// High Frequency Generation - Patch Construction (14496-3 sp04 p216 fig. 4.46)
501
static int sbr_hf_calc_npatches(AACContext *ac, SpectralBandReplication *sbr)
502
{
503
    int i, k, sb = 0;
504
    int msb = sbr->k[0];
505
    int usb = sbr->kx[1];
506
    int goal_sb = ((1000 << 11) + (sbr->sample_rate >> 1)) / sbr->sample_rate;
507

    
508
    sbr->num_patches = 0;
509

    
510
    if (goal_sb < sbr->kx[1] + sbr->m[1]) {
511
        for (k = 0; sbr->f_master[k] < goal_sb; k++) ;
512
    } else
513
        k = sbr->n_master;
514

    
515
    do {
516
        int odd = 0;
517
        for (i = k; i == k || sb > (sbr->k[0] - 1 + msb - odd); i--) {
518
            sb = sbr->f_master[i];
519
            odd = (sb + sbr->k[0]) & 1;
520
        }
521

    
522
        sbr->patch_num_subbands[sbr->num_patches]  = FFMAX(sb - usb, 0);
523
        sbr->patch_start_subband[sbr->num_patches] = sbr->k[0] - odd - sbr->patch_num_subbands[sbr->num_patches];
524

    
525
        if (sbr->patch_num_subbands[sbr->num_patches] > 0) {
526
            usb = sb;
527
            msb = sb;
528
            sbr->num_patches++;
529
        } else
530
            msb = sbr->kx[1];
531

    
532
        if (sbr->f_master[k] - sb < 3)
533
            k = sbr->n_master;
534
    } while (sb != sbr->kx[1] + sbr->m[1]);
535

    
536
    if (sbr->patch_num_subbands[sbr->num_patches-1] < 3 && sbr->num_patches > 1)
537
        sbr->num_patches--;
538

    
539
    // Requirements (14496-3 sp04 p205) sets the maximum number of patches to 5
540
    // However the Coding Technologies decoder check uses 6 patches
541
    if (sbr->num_patches > 6) {
542
        av_log(ac->avccontext, AV_LOG_ERROR, "Too many patches: %d\n", sbr->num_patches);
543
        return -1;
544
    }
545

    
546
    return 0;
547
}
548

    
549
/// Derived Frequency Band Tables (14496-3 sp04 p197)
550
static int sbr_make_f_derived(AACContext *ac, SpectralBandReplication *sbr)
551
{
552
    int k, temp;
553

    
554
    sbr->n[1] = sbr->n_master - sbr->spectrum_params.bs_xover_band;
555
    sbr->n[0] = (sbr->n[1] + 1) >> 1;
556

    
557
    memcpy(sbr->f_tablehigh, &sbr->f_master[sbr->spectrum_params.bs_xover_band],
558
           (sbr->n[1] + 1) * sizeof(sbr->f_master[0]));
559
    sbr->m[1] = sbr->f_tablehigh[sbr->n[1]] - sbr->f_tablehigh[0];
560
    sbr->kx[1] = sbr->f_tablehigh[0];
561

    
562
    // Requirements (14496-3 sp04 p205)
563
    if (sbr->kx[1] + sbr->m[1] > 64) {
564
        av_log(ac->avccontext, AV_LOG_ERROR,
565
               "Stop frequency border too high: %d\n", sbr->kx[1] + sbr->m[1]);
566
        return -1;
567
    }
568
    if (sbr->kx[1] > 32) {
569
        av_log(ac->avccontext, AV_LOG_ERROR, "Start frequency border too high: %d\n", sbr->kx[1]);
570
        return -1;
571
    }
572

    
573
    sbr->f_tablelow[0] = sbr->f_tablehigh[0];
574
    temp = sbr->n[1] & 1;
575
    for (k = 1; k <= sbr->n[0]; k++)
576
        sbr->f_tablelow[k] = sbr->f_tablehigh[2 * k - temp];
577

    
578
    sbr->n_q = FFMAX(1, lrintf(sbr->spectrum_params.bs_noise_bands *
579
                               log2f(sbr->k[2] / (float)sbr->kx[1]))); // 0 <= bs_noise_bands <= 3
580
    if (sbr->n_q > 5) {
581
        av_log(ac->avccontext, AV_LOG_ERROR, "Too many noise floor scale factors: %d\n", sbr->n_q);
582
        return -1;
583
    }
584

    
585
    sbr->f_tablenoise[0] = sbr->f_tablelow[0];
586
    temp = 0;
587
    for (k = 1; k <= sbr->n_q; k++) {
588
        temp += (sbr->n[0] - temp) / (sbr->n_q + 1 - k);
589
        sbr->f_tablenoise[k] = sbr->f_tablelow[temp];
590
    }
591

    
592
    if (sbr_hf_calc_npatches(ac, sbr) < 0)
593
        return -1;
594

    
595
    sbr_make_f_tablelim(sbr);
596

    
597
    sbr->data[0].f_indexnoise = 0;
598
    sbr->data[1].f_indexnoise = 0;
599

    
600
    return 0;
601
}
602

    
603
static av_always_inline void get_bits1_vector(GetBitContext *gb, uint8_t *vec,
604
                                              int elements)
605
{
606
    int i;
607
    for (i = 0; i < elements; i++) {
608
        vec[i] = get_bits1(gb);
609
    }
610
}
611

    
612
/** ceil(log2(index+1)) */
613
static const int8_t ceil_log2[] = {
614
    0, 1, 2, 2, 3, 3,
615
};
616

    
617
static int read_sbr_grid(AACContext *ac, SpectralBandReplication *sbr,
618
                         GetBitContext *gb, SBRData *ch_data)
619
{
620
    int i;
621
    unsigned bs_pointer;
622
    int abs_bord_lead = 0;
623
    // frameLengthFlag ? 15 : 16; 960 sample length frames unsupported; this value is numTimeSlots
624
    int abs_bord_trail = 16;
625
    int num_rel_lead, num_rel_trail;
626
    uint8_t bs_rel_bord[2][3];
627

    
628
    ch_data->bs_freq_res[0] = ch_data->bs_freq_res[ch_data->bs_num_env[1]];
629
    ch_data->bs_num_env[0] = ch_data->bs_num_env[1];
630
    ch_data->bs_amp_res = sbr->bs_amp_res_header;
631

    
632
    switch (ch_data->bs_frame_class = get_bits(gb, 2)) {
633
    case FIXFIX:
634
        ch_data->bs_num_env[1] = 1 << get_bits(gb, 2);
635
        num_rel_lead           = ch_data->bs_num_env[1] - 1;
636
        if (ch_data->bs_num_env[1] == 1)
637
            ch_data->bs_amp_res = 0;
638

    
639
        if (ch_data->bs_num_env[1] > 4) {
640
            av_log(ac->avccontext, AV_LOG_ERROR,
641
                   "Invalid bitstream, too many SBR envelopes in FIXFIX type SBR frame: %d\n",
642
                   ch_data->bs_num_env[1]);
643
            return -1;
644
        }
645

    
646
        bs_pointer = 0;
647

    
648
        ch_data->bs_freq_res[1] = get_bits1(gb);
649
        for (i = 1; i < ch_data->bs_num_env[1]; i++)
650
            ch_data->bs_freq_res[i + 1] = ch_data->bs_freq_res[1];
651
        break;
652
    case FIXVAR:
653
        abs_bord_trail         += get_bits(gb, 2);
654
        num_rel_trail           = get_bits(gb, 2);
655
        num_rel_lead            = 0;
656
        ch_data->bs_num_env[1]  = num_rel_trail + 1;
657

    
658
        for (i = 0; i < num_rel_trail; i++)
659
            bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
660

    
661
        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
662

    
663
        for (i = 0; i < ch_data->bs_num_env[1]; i++)
664
            ch_data->bs_freq_res[ch_data->bs_num_env[1] - i] = get_bits1(gb);
665
        break;
666
    case VARFIX:
667
        abs_bord_lead           = get_bits(gb, 2);
668
        num_rel_lead            = get_bits(gb, 2);
669
        ch_data->bs_num_env[1]  = num_rel_lead + 1;
670

    
671
        for (i = 0; i < num_rel_lead; i++)
672
            bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
673

    
674
        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
675

    
676
        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
677
        break;
678
    case VARVAR:
679
        abs_bord_lead           = get_bits(gb, 2);
680
        abs_bord_trail         += get_bits(gb, 2);
681
        num_rel_lead            = get_bits(gb, 2);
682
        num_rel_trail           = get_bits(gb, 2);
683
        ch_data->bs_num_env[1]  = num_rel_lead + num_rel_trail + 1;
684

    
685
        if (ch_data->bs_num_env[1] > 5) {
686
            av_log(ac->avccontext, AV_LOG_ERROR,
687
                   "Invalid bitstream, too many SBR envelopes in VARVAR type SBR frame: %d\n",
688
                   ch_data->bs_num_env[1]);
689
            return -1;
690
        }
691

    
692
        for (i = 0; i < num_rel_lead; i++)
693
            bs_rel_bord[0][i] = 2 * get_bits(gb, 2) + 2;
694
        for (i = 0; i < num_rel_trail; i++)
695
            bs_rel_bord[1][i] = 2 * get_bits(gb, 2) + 2;
696

    
697
        bs_pointer = get_bits(gb, ceil_log2[ch_data->bs_num_env[1]]);
698

    
699
        get_bits1_vector(gb, ch_data->bs_freq_res + 1, ch_data->bs_num_env[1]);
700
        break;
701
    }
702

    
703
    if (bs_pointer > ch_data->bs_num_env[1] + 1) {
704
        av_log(ac->avccontext, AV_LOG_ERROR,
705
               "Invalid bitstream, bs_pointer points to a middle noise border outside the time borders table: %d\n",
706
               bs_pointer);
707
        return -1;
708
    }
709

    
710
    ch_data->t_env_num_env_old = ch_data->t_env[ch_data->bs_num_env[0]];
711
    ch_data->t_env[0]                      = abs_bord_lead;
712
    ch_data->t_env[ch_data->bs_num_env[1]] = abs_bord_trail;
713

    
714
    if (ch_data->bs_frame_class == FIXFIX) {
715
        int temp = (abs_bord_trail + (ch_data->bs_num_env[1] >> 1)) /
716
                   ch_data->bs_num_env[1];
717
        for (i = 0; i < num_rel_lead; i++)
718
            ch_data->t_env[i + 1] = ch_data->t_env[i] + temp;
719
    } else if (ch_data->bs_frame_class > 1) { // VARFIX or VARVAR
720
        for (i = 0; i < num_rel_lead; i++)
721
            ch_data->t_env[i + 1] = ch_data->t_env[i] + bs_rel_bord[0][i];
722
    }
723

    
724
    if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
725
        for (i = ch_data->bs_num_env[1] - 1; i > num_rel_lead; i--)
726
            ch_data->t_env[i] = ch_data->t_env[i + 1] -
727
                                bs_rel_bord[1][ch_data->bs_num_env[1] - 1 - i];
728
    }
729

    
730
    ch_data->bs_num_noise = (ch_data->bs_num_env[1] > 1) + 1;
731

    
732
    ch_data->t_q[0] = ch_data->t_env[0];
733
    if (ch_data->bs_num_noise > 1) {
734
        unsigned int idx;
735
        if (ch_data->bs_frame_class == FIXFIX) {
736
            idx = ch_data->bs_num_env[1] >> 1;
737
        } else if (ch_data->bs_frame_class & 1) { // FIXVAR or VARVAR
738
            idx = ch_data->bs_num_env[1] - FFMAX(bs_pointer - 1, 1);
739
        } else { // VARFIX
740
            if (!bs_pointer)
741
                idx = 1;
742
            else if (bs_pointer == 1)
743
                idx = ch_data->bs_num_env[1] - 1;
744
            else // bs_pointer > 1
745
                idx = bs_pointer - 1;
746
        }
747
        ch_data->t_q[1] = ch_data->t_env[idx];
748
        ch_data->t_q[2] = ch_data->t_env[ch_data->bs_num_env[1]];
749
    } else
750
        ch_data->t_q[1] = ch_data->t_env[ch_data->bs_num_env[1]];
751

    
752
    ch_data->e_a[0] = -(ch_data->e_a[1] != ch_data->bs_num_env[0]); // l_APrev
753
    ch_data->e_a[1] = -1;
754
    if ((ch_data->bs_frame_class & 1) && bs_pointer) { // FIXVAR or VARVAR and bs_pointer != 0
755
        ch_data->e_a[1] = ch_data->bs_num_env[1] + 1 - bs_pointer;
756
    } else if ((ch_data->bs_frame_class == 2) && (bs_pointer > 1)) // VARFIX and bs_pointer > 1
757
        ch_data->e_a[1] = bs_pointer - 1;
758

    
759
    return 0;
760
}
761

    
762
static void copy_sbr_grid(SBRData *dst, const SBRData *src) {
763
    //These variables are saved from the previous frame rather than copied
764
    dst->bs_freq_res[0] = dst->bs_freq_res[dst->bs_num_env[1]];
765
    dst->bs_num_env[0]  = dst->bs_num_env[1];
766
    dst->t_env_num_env_old = dst->t_env[dst->bs_num_env[0]];
767
    dst->e_a[0]         = -(dst->e_a[1] != dst->bs_num_env[0]);
768

    
769
    //These variables are read from the bitstream and therefore copied
770
    memcpy(dst->bs_freq_res+1, src->bs_freq_res+1, sizeof(dst->bs_freq_res)-sizeof(*dst->bs_freq_res));
771
    memcpy(dst->bs_num_env+1,  src->bs_num_env+1,  sizeof(dst->bs_num_env)- sizeof(*dst->bs_num_env));
772
    memcpy(dst->t_env,         src->t_env,         sizeof(dst->t_env));
773
    memcpy(dst->t_q,           src->t_q,           sizeof(dst->t_q));
774
    dst->bs_amp_res     = src->bs_amp_res;
775
    dst->bs_num_noise   = src->bs_num_noise;
776
    dst->bs_frame_class = src->bs_frame_class;
777
    dst->e_a[1]         = src->e_a[1];
778
}
779

    
780
/// Read how the envelope and noise floor data is delta coded
781
static void read_sbr_dtdf(SpectralBandReplication *sbr, GetBitContext *gb,
782
                          SBRData *ch_data)
783
{
784
    get_bits1_vector(gb, ch_data->bs_df_env,   ch_data->bs_num_env[1]);
785
    get_bits1_vector(gb, ch_data->bs_df_noise, ch_data->bs_num_noise);
786
}
787

    
788
/// Read inverse filtering data
789
static void read_sbr_invf(SpectralBandReplication *sbr, GetBitContext *gb,
790
                          SBRData *ch_data)
791
{
792
    int i;
793

    
794
    memcpy(ch_data->bs_invf_mode[1], ch_data->bs_invf_mode[0], 5 * sizeof(uint8_t));
795
    for (i = 0; i < sbr->n_q; i++)
796
        ch_data->bs_invf_mode[0][i] = get_bits(gb, 2);
797
}
798

    
799
static void read_sbr_envelope(SpectralBandReplication *sbr, GetBitContext *gb,
800
                              SBRData *ch_data, int ch)
801
{
802
    int bits;
803
    int i, j, k;
804
    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
805
    int t_lav, f_lav;
806
    const int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
807
    const int odd = sbr->n[1] & 1;
808

    
809
    if (sbr->bs_coupling && ch) {
810
        if (ch_data->bs_amp_res) {
811
            bits   = 5;
812
            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_3_0DB].table;
813
            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_3_0DB];
814
            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
815
            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
816
        } else {
817
            bits   = 6;
818
            t_huff = vlc_sbr[T_HUFFMAN_ENV_BAL_1_5DB].table;
819
            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_BAL_1_5DB];
820
            f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_1_5DB].table;
821
            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_1_5DB];
822
        }
823
    } else {
824
        if (ch_data->bs_amp_res) {
825
            bits   = 6;
826
            t_huff = vlc_sbr[T_HUFFMAN_ENV_3_0DB].table;
827
            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_3_0DB];
828
            f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
829
            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
830
        } else {
831
            bits   = 7;
832
            t_huff = vlc_sbr[T_HUFFMAN_ENV_1_5DB].table;
833
            t_lav  = vlc_sbr_lav[T_HUFFMAN_ENV_1_5DB];
834
            f_huff = vlc_sbr[F_HUFFMAN_ENV_1_5DB].table;
835
            f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_1_5DB];
836
        }
837
    }
838

    
839
    for (i = 0; i < ch_data->bs_num_env[1]; i++) {
840
        if (ch_data->bs_df_env[i]) {
841
            // bs_freq_res[0] == bs_freq_res[bs_num_env[1]] from prev frame
842
            if (ch_data->bs_freq_res[i + 1] == ch_data->bs_freq_res[i]) {
843
                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
844
                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
845
            } else if (ch_data->bs_freq_res[i + 1]) {
846
                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
847
                    k = (j + odd) >> 1; // find k such that f_tablelow[k] <= f_tablehigh[j] < f_tablelow[k + 1]
848
                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
849
                }
850
            } else {
851
                for (j = 0; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++) {
852
                    k = j ? 2*j - odd : 0; // find k such that f_tablehigh[k] == f_tablelow[j]
853
                    ch_data->env_facs[i + 1][j] = ch_data->env_facs[i][k] + delta * (get_vlc2(gb, t_huff, 9, 3) - t_lav);
854
                }
855
            }
856
        } else {
857
            ch_data->env_facs[i + 1][0] = delta * get_bits(gb, bits); // bs_env_start_value_balance
858
            for (j = 1; j < sbr->n[ch_data->bs_freq_res[i + 1]]; j++)
859
                ch_data->env_facs[i + 1][j] = ch_data->env_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
860
        }
861
    }
862

    
863
    //assign 0th elements of env_facs from last elements
864
    memcpy(ch_data->env_facs[0], ch_data->env_facs[ch_data->bs_num_env[1]],
865
           sizeof(ch_data->env_facs[0]));
866
}
867

    
868
static void read_sbr_noise(SpectralBandReplication *sbr, GetBitContext *gb,
869
                           SBRData *ch_data, int ch)
870
{
871
    int i, j;
872
    VLC_TYPE (*t_huff)[2], (*f_huff)[2];
873
    int t_lav, f_lav;
874
    int delta = (ch == 1 && sbr->bs_coupling == 1) + 1;
875

    
876
    if (sbr->bs_coupling && ch) {
877
        t_huff = vlc_sbr[T_HUFFMAN_NOISE_BAL_3_0DB].table;
878
        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_BAL_3_0DB];
879
        f_huff = vlc_sbr[F_HUFFMAN_ENV_BAL_3_0DB].table;
880
        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_BAL_3_0DB];
881
    } else {
882
        t_huff = vlc_sbr[T_HUFFMAN_NOISE_3_0DB].table;
883
        t_lav  = vlc_sbr_lav[T_HUFFMAN_NOISE_3_0DB];
884
        f_huff = vlc_sbr[F_HUFFMAN_ENV_3_0DB].table;
885
        f_lav  = vlc_sbr_lav[F_HUFFMAN_ENV_3_0DB];
886
    }
887

    
888
    for (i = 0; i < ch_data->bs_num_noise; i++) {
889
        if (ch_data->bs_df_noise[i]) {
890
            for (j = 0; j < sbr->n_q; j++)
891
                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i][j] + delta * (get_vlc2(gb, t_huff, 9, 2) - t_lav);
892
        } else {
893
            ch_data->noise_facs[i + 1][0] = delta * get_bits(gb, 5); // bs_noise_start_value_balance or bs_noise_start_value_level
894
            for (j = 1; j < sbr->n_q; j++)
895
                ch_data->noise_facs[i + 1][j] = ch_data->noise_facs[i + 1][j - 1] + delta * (get_vlc2(gb, f_huff, 9, 3) - f_lav);
896
        }
897
    }
898

    
899
    //assign 0th elements of noise_facs from last elements
900
    memcpy(ch_data->noise_facs[0], ch_data->noise_facs[ch_data->bs_num_noise],
901
           sizeof(ch_data->noise_facs[0]));
902
}
903

    
904
static void read_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
905
                               GetBitContext *gb,
906
                          int bs_extension_id, int *num_bits_left)
907
{
908
//TODO - implement ps_data for parametric stereo parsing
909
    switch (bs_extension_id) {
910
    case EXTENSION_ID_PS:
911
#if 0
912
        *num_bits_left -= ff_ps_data(gb, ps);
913
#else
914
        av_log_missing_feature(ac->avccontext, "Parametric Stereo is", 0);
915
        skip_bits_long(gb, *num_bits_left); // bs_fill_bits
916
        *num_bits_left = 0;
917
#endif
918
        break;
919
    default:
920
        av_log_missing_feature(ac->avccontext, "Reserved SBR extensions are", 1);
921
        skip_bits_long(gb, *num_bits_left); // bs_fill_bits
922
        *num_bits_left = 0;
923
        break;
924
    }
925
}
926

    
927
static int read_sbr_single_channel_element(AACContext *ac,
928
                                            SpectralBandReplication *sbr,
929
                                            GetBitContext *gb)
930
{
931
    if (get_bits1(gb)) // bs_data_extra
932
        skip_bits(gb, 4); // bs_reserved
933

    
934
    if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
935
        return -1;
936
    read_sbr_dtdf(sbr, gb, &sbr->data[0]);
937
    read_sbr_invf(sbr, gb, &sbr->data[0]);
938
    read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
939
    read_sbr_noise(sbr, gb, &sbr->data[0], 0);
940

    
941
    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
942
        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
943

    
944
    return 0;
945
}
946

    
947
static int read_sbr_channel_pair_element(AACContext *ac,
948
                                          SpectralBandReplication *sbr,
949
                                          GetBitContext *gb)
950
{
951
    if (get_bits1(gb))    // bs_data_extra
952
        skip_bits(gb, 8); // bs_reserved
953

    
954
    if ((sbr->bs_coupling = get_bits1(gb))) {
955
        if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]))
956
            return -1;
957
        copy_sbr_grid(&sbr->data[1], &sbr->data[0]);
958
        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
959
        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
960
        read_sbr_invf(sbr, gb, &sbr->data[0]);
961
        memcpy(sbr->data[1].bs_invf_mode[1], sbr->data[1].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
962
        memcpy(sbr->data[1].bs_invf_mode[0], sbr->data[0].bs_invf_mode[0], sizeof(sbr->data[1].bs_invf_mode[0]));
963
        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
964
        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
965
        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
966
        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
967
    } else {
968
        if (read_sbr_grid(ac, sbr, gb, &sbr->data[0]) ||
969
            read_sbr_grid(ac, sbr, gb, &sbr->data[1]))
970
            return -1;
971
        read_sbr_dtdf(sbr, gb, &sbr->data[0]);
972
        read_sbr_dtdf(sbr, gb, &sbr->data[1]);
973
        read_sbr_invf(sbr, gb, &sbr->data[0]);
974
        read_sbr_invf(sbr, gb, &sbr->data[1]);
975
        read_sbr_envelope(sbr, gb, &sbr->data[0], 0);
976
        read_sbr_envelope(sbr, gb, &sbr->data[1], 1);
977
        read_sbr_noise(sbr, gb, &sbr->data[0], 0);
978
        read_sbr_noise(sbr, gb, &sbr->data[1], 1);
979
    }
980

    
981
    if ((sbr->data[0].bs_add_harmonic_flag = get_bits1(gb)))
982
        get_bits1_vector(gb, sbr->data[0].bs_add_harmonic, sbr->n[1]);
983
    if ((sbr->data[1].bs_add_harmonic_flag = get_bits1(gb)))
984
        get_bits1_vector(gb, sbr->data[1].bs_add_harmonic, sbr->n[1]);
985

    
986
    return 0;
987
}
988

    
989
static unsigned int read_sbr_data(AACContext *ac, SpectralBandReplication *sbr,
990
                                  GetBitContext *gb, int id_aac)
991
{
992
    unsigned int cnt = get_bits_count(gb);
993

    
994
    if (id_aac == TYPE_SCE || id_aac == TYPE_CCE) {
995
        if (read_sbr_single_channel_element(ac, sbr, gb)) {
996
            sbr->start = 0;
997
            return get_bits_count(gb) - cnt;
998
        }
999
    } else if (id_aac == TYPE_CPE) {
1000
        if (read_sbr_channel_pair_element(ac, sbr, gb)) {
1001
            sbr->start = 0;
1002
            return get_bits_count(gb) - cnt;
1003
        }
1004
    } else {
1005
        av_log(ac->avccontext, AV_LOG_ERROR,
1006
            "Invalid bitstream - cannot apply SBR to element type %d\n", id_aac);
1007
        sbr->start = 0;
1008
        return get_bits_count(gb) - cnt;
1009
    }
1010
    if (get_bits1(gb)) { // bs_extended_data
1011
        int num_bits_left = get_bits(gb, 4); // bs_extension_size
1012
        if (num_bits_left == 15)
1013
            num_bits_left += get_bits(gb, 8); // bs_esc_count
1014

    
1015
        num_bits_left <<= 3;
1016
        while (num_bits_left > 7) {
1017
            num_bits_left -= 2;
1018
            read_sbr_extension(ac, sbr, gb, get_bits(gb, 2), &num_bits_left); // bs_extension_id
1019
        }
1020
    }
1021

    
1022
    return get_bits_count(gb) - cnt;
1023
}
1024

    
1025
static void sbr_reset(AACContext *ac, SpectralBandReplication *sbr)
1026
{
1027
    int err;
1028
    err = sbr_make_f_master(ac, sbr, &sbr->spectrum_params);
1029
    if (err >= 0)
1030
        err = sbr_make_f_derived(ac, sbr);
1031
    if (err < 0) {
1032
        av_log(ac->avccontext, AV_LOG_ERROR,
1033
               "SBR reset failed. Switching SBR to pure upsampling mode.\n");
1034
        sbr->start = 0;
1035
    }
1036
}
1037

    
1038
/**
1039
 * Decode Spectral Band Replication extension data; reference: table 4.55.
1040
 *
1041
 * @param   crc flag indicating the presence of CRC checksum
1042
 * @param   cnt length of TYPE_FIL syntactic element in bytes
1043
 *
1044
 * @return  Returns number of bytes consumed from the TYPE_FIL element.
1045
 */
1046
int ff_decode_sbr_extension(AACContext *ac, SpectralBandReplication *sbr,
1047
                            GetBitContext *gb_host, int crc, int cnt, int id_aac)
1048
{
1049
    unsigned int num_sbr_bits = 0, num_align_bits;
1050
    unsigned bytes_read;
1051
    GetBitContext gbc = *gb_host, *gb = &gbc;
1052
    skip_bits_long(gb_host, cnt*8 - 4);
1053

    
1054
    sbr->reset = 0;
1055

    
1056
    if (!sbr->sample_rate)
1057
        sbr->sample_rate = 2 * ac->m4ac.sample_rate; //TODO use the nominal sample rate for arbitrary sample rate support
1058
    if (!ac->m4ac.ext_sample_rate)
1059
        ac->m4ac.ext_sample_rate = 2 * ac->m4ac.sample_rate;
1060

    
1061
    if (crc) {
1062
        skip_bits(gb, 10); // bs_sbr_crc_bits; TODO - implement CRC check
1063
        num_sbr_bits += 10;
1064
    }
1065

    
1066
    //Save some state from the previous frame.
1067
    sbr->kx[0] = sbr->kx[1];
1068
    sbr->m[0] = sbr->m[1];
1069

    
1070
    num_sbr_bits++;
1071
    if (get_bits1(gb)) // bs_header_flag
1072
        num_sbr_bits += read_sbr_header(sbr, gb);
1073

    
1074
    if (sbr->reset)
1075
        sbr_reset(ac, sbr);
1076

    
1077
    if (sbr->start)
1078
        num_sbr_bits  += read_sbr_data(ac, sbr, gb, id_aac);
1079

    
1080
    num_align_bits = ((cnt << 3) - 4 - num_sbr_bits) & 7;
1081
    bytes_read = ((num_sbr_bits + num_align_bits + 4) >> 3);
1082

    
1083
    if (bytes_read > cnt) {
1084
        av_log(ac->avccontext, AV_LOG_ERROR,
1085
               "Expected to read %d SBR bytes actually read %d.\n", cnt, bytes_read);
1086
    }
1087
    return cnt;
1088
}
1089

    
1090
/// Dequantization and stereo decoding (14496-3 sp04 p203)
1091
static void sbr_dequant(SpectralBandReplication *sbr, int id_aac)
1092
{
1093
    int k, e;
1094
    int ch;
1095

    
1096
    if (id_aac == TYPE_CPE && sbr->bs_coupling) {
1097
        float alpha      = sbr->data[0].bs_amp_res ?  1.0f :  0.5f;
1098
        float pan_offset = sbr->data[0].bs_amp_res ? 12.0f : 24.0f;
1099
        for (e = 1; e <= sbr->data[0].bs_num_env[1]; e++) {
1100
            for (k = 0; k < sbr->n[sbr->data[0].bs_freq_res[e]]; k++) {
1101
                float temp1 = exp2f(sbr->data[0].env_facs[e][k] * alpha + 7.0f);
1102
                float temp2 = exp2f((pan_offset - sbr->data[1].env_facs[e][k]) * alpha);
1103
                float fac   = temp1 / (1.0f + temp2);
1104
                sbr->data[0].env_facs[e][k] = fac;
1105
                sbr->data[1].env_facs[e][k] = fac * temp2;
1106
            }
1107
        }
1108
        for (e = 1; e <= sbr->data[0].bs_num_noise; e++) {
1109
            for (k = 0; k < sbr->n_q; k++) {
1110
                float temp1 = exp2f(NOISE_FLOOR_OFFSET - sbr->data[0].noise_facs[e][k] + 1);
1111
                float temp2 = exp2f(12 - sbr->data[1].noise_facs[e][k]);
1112
                float fac   = temp1 / (1.0f + temp2);
1113
                sbr->data[0].noise_facs[e][k] = fac;
1114
                sbr->data[1].noise_facs[e][k] = fac * temp2;
1115
            }
1116
        }
1117
    } else { // SCE or one non-coupled CPE
1118
        for (ch = 0; ch < (id_aac == TYPE_CPE) + 1; ch++) {
1119
            float alpha = sbr->data[ch].bs_amp_res ? 1.0f : 0.5f;
1120
            for (e = 1; e <= sbr->data[ch].bs_num_env[1]; e++)
1121
                for (k = 0; k < sbr->n[sbr->data[ch].bs_freq_res[e]]; k++)
1122
                    sbr->data[ch].env_facs[e][k] =
1123
                        exp2f(alpha * sbr->data[ch].env_facs[e][k] + 6.0f);
1124
            for (e = 1; e <= sbr->data[ch].bs_num_noise; e++)
1125
                for (k = 0; k < sbr->n_q; k++)
1126
                    sbr->data[ch].noise_facs[e][k] =
1127
                        exp2f(NOISE_FLOOR_OFFSET - sbr->data[ch].noise_facs[e][k]);
1128
        }
1129
    }
1130
}
1131

    
1132
/**
1133
 * Analysis QMF Bank (14496-3 sp04 p206)
1134
 *
1135
 * @param   x       pointer to the beginning of the first sample window
1136
 * @param   W       array of complex-valued samples split into subbands
1137
 */
1138
static void sbr_qmf_analysis(DSPContext *dsp, RDFTContext *rdft, const float *in, float *x,
1139
                             float z[320], float W[2][32][32][2],
1140
                             float bias, float scale)
1141
{
1142
    int i, k;
1143
    memcpy(W[0], W[1], sizeof(W[0]));
1144
    memcpy(x    , x+1024, (320-32)*sizeof(x[0]));
1145
    if (scale != 1.0f || bias != 0.0f)
1146
        for (i = 0; i < 1024; i++)
1147
            x[288 + i] = (in[i] - bias) * scale;
1148
    else
1149
        memcpy(x+288, in, 1024*sizeof(*x));
1150
    for (i = 0; i < 32; i++) { // numTimeSlots*RATE = 16*2 as 960 sample frames
1151
                               // are not supported
1152
        float re, im;
1153
        dsp->vector_fmul_reverse(z, sbr_qmf_window_ds, x, 320);
1154
        for (k = 0; k < 64; k++) {
1155
            float f = z[k] + z[k + 64] + z[k + 128] + z[k + 192] + z[k + 256];
1156
            z[k] = f * analysis_cos_pre[k];
1157
            z[k+64] = f;
1158
        }
1159
        ff_rdft_calc(rdft, z);
1160
        re = z[0] * 0.5f;
1161
        im = 0.5f * dsp->scalarproduct_float(z+64, analysis_sin_pre, 64);
1162
        W[1][i][0][0] = re * analysis_cossin_post[0][0] - im * analysis_cossin_post[0][1];
1163
        W[1][i][0][1] = re * analysis_cossin_post[0][1] + im * analysis_cossin_post[0][0];
1164
        for (k = 1; k < 32; k++) {
1165
            re = z[2*k  ] - re;
1166
            im = z[2*k+1] - im;
1167
            W[1][i][k][0] = re * analysis_cossin_post[k][0] - im * analysis_cossin_post[k][1];
1168
            W[1][i][k][1] = re * analysis_cossin_post[k][1] + im * analysis_cossin_post[k][0];
1169
        }
1170
        x += 32;
1171
    }
1172
}
1173

    
1174
/**
1175
 * Synthesis QMF Bank (14496-3 sp04 p206) and Downsampled Synthesis QMF Bank
1176
 * (14496-3 sp04 p206)
1177
 */
1178
static void sbr_qmf_synthesis(DSPContext *dsp, FFTContext *mdct,
1179
                              float *out, float X[2][32][64],
1180
                              float mdct_buf[2][64],
1181
                              float *v0, int *v_off, const unsigned int div,
1182
                              float bias, float scale)
1183
{
1184
    int i, n;
1185
    const float *sbr_qmf_window = div ? sbr_qmf_window_ds : sbr_qmf_window_us;
1186
    int scale_and_bias = scale != 1.0f || bias != 0.0f;
1187
    float *v;
1188
    for (i = 0; i < 32; i++) {
1189
        if (*v_off == 0) {
1190
            int saved_samples = (1280 - 128) >> div;
1191
            memcpy(&v0[SBR_SYNTHESIS_BUF_SIZE - saved_samples], v0, saved_samples * sizeof(float));
1192
            *v_off = SBR_SYNTHESIS_BUF_SIZE - saved_samples - (128 >> div);
1193
        } else {
1194
            *v_off -= 128 >> div;
1195
        }
1196
        v = v0 + *v_off;
1197
        for (n = 1; n < 64 >> div; n+=2) {
1198
            X[1][i][n] = -X[1][i][n];
1199
        }
1200
        if (div) {
1201
            memset(X[0][i]+32, 0, 32*sizeof(float));
1202
            memset(X[1][i]+32, 0, 32*sizeof(float));
1203
        }
1204
        ff_imdct_half(mdct, mdct_buf[0], X[0][i]);
1205
        ff_imdct_half(mdct, mdct_buf[1], X[1][i]);
1206
        if (div) {
1207
            for (n = 0; n < 32; n++) {
1208
                v[      n] = -mdct_buf[0][63 - 2*n] + mdct_buf[1][2*n    ];
1209
                v[ 63 - n] =  mdct_buf[0][62 - 2*n] + mdct_buf[1][2*n + 1];
1210
            }
1211
        } else {
1212
            for (n = 0; n < 64; n++) {
1213
                v[      n] = -mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];
1214
                v[127 - n] =  mdct_buf[0][63 -   n] + mdct_buf[1][  n    ];
1215
            }
1216
        }
1217
        dsp->vector_fmul_add(out, v                , sbr_qmf_window               , zero64, 64 >> div);
1218
        dsp->vector_fmul_add(out, v + ( 192 >> div), sbr_qmf_window + ( 64 >> div), out   , 64 >> div);
1219
        dsp->vector_fmul_add(out, v + ( 256 >> div), sbr_qmf_window + (128 >> div), out   , 64 >> div);
1220
        dsp->vector_fmul_add(out, v + ( 448 >> div), sbr_qmf_window + (192 >> div), out   , 64 >> div);
1221
        dsp->vector_fmul_add(out, v + ( 512 >> div), sbr_qmf_window + (256 >> div), out   , 64 >> div);
1222
        dsp->vector_fmul_add(out, v + ( 704 >> div), sbr_qmf_window + (320 >> div), out   , 64 >> div);
1223
        dsp->vector_fmul_add(out, v + ( 768 >> div), sbr_qmf_window + (384 >> div), out   , 64 >> div);
1224
        dsp->vector_fmul_add(out, v + ( 960 >> div), sbr_qmf_window + (448 >> div), out   , 64 >> div);
1225
        dsp->vector_fmul_add(out, v + (1024 >> div), sbr_qmf_window + (512 >> div), out   , 64 >> div);
1226
        dsp->vector_fmul_add(out, v + (1216 >> div), sbr_qmf_window + (576 >> div), out   , 64 >> div);
1227
        if (scale_and_bias)
1228
            for (n = 0; n < 64 >> div; n++)
1229
                out[n] = out[n] * scale + bias;
1230
        out += 64 >> div;
1231
    }
1232
}
1233

    
1234
static void autocorrelate(const float x[40][2], float phi[3][2][2], int lag)
1235
{
1236
    int i;
1237
    float real_sum = 0.0f;
1238
    float imag_sum = 0.0f;
1239
    if (lag) {
1240
        for (i = 1; i < 38; i++) {
1241
            real_sum += x[i][0] * x[i+lag][0] + x[i][1] * x[i+lag][1];
1242
            imag_sum += x[i][0] * x[i+lag][1] - x[i][1] * x[i+lag][0];
1243
        }
1244
        phi[2-lag][1][0] = real_sum + x[ 0][0] * x[lag][0] + x[ 0][1] * x[lag][1];
1245
        phi[2-lag][1][1] = imag_sum + x[ 0][0] * x[lag][1] - x[ 0][1] * x[lag][0];
1246
        if (lag == 1) {
1247
            phi[0][0][0] = real_sum + x[38][0] * x[39][0] + x[38][1] * x[39][1];
1248
            phi[0][0][1] = imag_sum + x[38][0] * x[39][1] - x[38][1] * x[39][0];
1249
        }
1250
    } else {
1251
        for (i = 1; i < 38; i++) {
1252
            real_sum += x[i][0] * x[i][0] + x[i][1] * x[i][1];
1253
        }
1254
        phi[2][1][0] = real_sum + x[ 0][0] * x[ 0][0] + x[ 0][1] * x[ 0][1];
1255
        phi[1][0][0] = real_sum + x[38][0] * x[38][0] + x[38][1] * x[38][1];
1256
    }
1257
}
1258

    
1259
/** High Frequency Generation (14496-3 sp04 p214+) and Inverse Filtering
1260
 * (14496-3 sp04 p214)
1261
 * Warning: This routine does not seem numerically stable.
1262
 */
1263
static void sbr_hf_inverse_filter(float (*alpha0)[2], float (*alpha1)[2],
1264
                                  const float X_low[32][40][2], int k0)
1265
{
1266
    int k;
1267
    for (k = 0; k < k0; k++) {
1268
        float phi[3][2][2], dk;
1269

    
1270
        autocorrelate(X_low[k], phi, 0);
1271
        autocorrelate(X_low[k], phi, 1);
1272
        autocorrelate(X_low[k], phi, 2);
1273

    
1274
        dk =  phi[2][1][0] * phi[1][0][0] -
1275
             (phi[1][1][0] * phi[1][1][0] + phi[1][1][1] * phi[1][1][1]) / 1.000001f;
1276

    
1277
        if (!dk) {
1278
            alpha1[k][0] = 0;
1279
            alpha1[k][1] = 0;
1280
        } else {
1281
            float temp_real, temp_im;
1282
            temp_real = phi[0][0][0] * phi[1][1][0] -
1283
                        phi[0][0][1] * phi[1][1][1] -
1284
                        phi[0][1][0] * phi[1][0][0];
1285
            temp_im   = phi[0][0][0] * phi[1][1][1] +
1286
                        phi[0][0][1] * phi[1][1][0] -
1287
                        phi[0][1][1] * phi[1][0][0];
1288

    
1289
            alpha1[k][0] = temp_real / dk;
1290
            alpha1[k][1] = temp_im   / dk;
1291
        }
1292

    
1293
        if (!phi[1][0][0]) {
1294
            alpha0[k][0] = 0;
1295
            alpha0[k][1] = 0;
1296
        } else {
1297
            float temp_real, temp_im;
1298
            temp_real = phi[0][0][0] + alpha1[k][0] * phi[1][1][0] +
1299
                                       alpha1[k][1] * phi[1][1][1];
1300
            temp_im   = phi[0][0][1] + alpha1[k][1] * phi[1][1][0] -
1301
                                       alpha1[k][0] * phi[1][1][1];
1302

    
1303
            alpha0[k][0] = -temp_real / phi[1][0][0];
1304
            alpha0[k][1] = -temp_im   / phi[1][0][0];
1305
        }
1306

    
1307
        if (alpha1[k][0] * alpha1[k][0] + alpha1[k][1] * alpha1[k][1] >= 16.0f ||
1308
           alpha0[k][0] * alpha0[k][0] + alpha0[k][1] * alpha0[k][1] >= 16.0f) {
1309
            alpha1[k][0] = 0;
1310
            alpha1[k][1] = 0;
1311
            alpha0[k][0] = 0;
1312
            alpha0[k][1] = 0;
1313
        }
1314
    }
1315
}
1316

    
1317
/// Chirp Factors (14496-3 sp04 p214)
1318
static void sbr_chirp(SpectralBandReplication *sbr, SBRData *ch_data)
1319
{
1320
    int i;
1321
    float new_bw;
1322
    static const float bw_tab[] = { 0.0f, 0.75f, 0.9f, 0.98f };
1323

    
1324
    for (i = 0; i < sbr->n_q; i++) {
1325
        if (ch_data->bs_invf_mode[0][i] + ch_data->bs_invf_mode[1][i] == 1) {
1326
            new_bw = 0.6f;
1327
        } else
1328
            new_bw = bw_tab[ch_data->bs_invf_mode[0][i]];
1329

    
1330
        if (new_bw < ch_data->bw_array[i]) {
1331
            new_bw = 0.75f    * new_bw + 0.25f    * ch_data->bw_array[i];
1332
        } else
1333
            new_bw = 0.90625f * new_bw + 0.09375f * ch_data->bw_array[i];
1334
        ch_data->bw_array[i] = new_bw < 0.015625f ? 0.0f : new_bw;
1335
    }
1336
}
1337

    
1338
/// Generate the subband filtered lowband
1339
static int sbr_lf_gen(AACContext *ac, SpectralBandReplication *sbr,
1340
                      float X_low[32][40][2], const float W[2][32][32][2])
1341
{
1342
    int i, k;
1343
    const int t_HFGen = 8;
1344
    const int i_f = 32;
1345
    memset(X_low, 0, 32*sizeof(*X_low));
1346
    for (k = 0; k < sbr->kx[1]; k++) {
1347
        for (i = t_HFGen; i < i_f + t_HFGen; i++) {
1348
            X_low[k][i][0] = W[1][i - t_HFGen][k][0];
1349
            X_low[k][i][1] = W[1][i - t_HFGen][k][1];
1350
        }
1351
    }
1352
    for (k = 0; k < sbr->kx[0]; k++) {
1353
        for (i = 0; i < t_HFGen; i++) {
1354
            X_low[k][i][0] = W[0][i + i_f - t_HFGen][k][0];
1355
            X_low[k][i][1] = W[0][i + i_f - t_HFGen][k][1];
1356
        }
1357
    }
1358
    return 0;
1359
}
1360

    
1361
/// High Frequency Generator (14496-3 sp04 p215)
1362
static int sbr_hf_gen(AACContext *ac, SpectralBandReplication *sbr,
1363
                      float X_high[64][40][2], const float X_low[32][40][2],
1364
                      const float (*alpha0)[2], const float (*alpha1)[2],
1365
                      const float bw_array[5], const uint8_t *t_env,
1366
                      int bs_num_env)
1367
{
1368
    int i, j, x;
1369
    int g = 0;
1370
    int k = sbr->kx[1];
1371
    for (j = 0; j < sbr->num_patches; j++) {
1372
        for (x = 0; x < sbr->patch_num_subbands[j]; x++, k++) {
1373
            float alpha[4];
1374
            const int p = sbr->patch_start_subband[j] + x;
1375
            while (g <= sbr->n_q && k >= sbr->f_tablenoise[g])
1376
                g++;
1377
            g--;
1378

    
1379
            if (g < 0) {
1380
                av_log(ac->avccontext, AV_LOG_ERROR,
1381
                       "ERROR : no subband found for frequency %d\n", k);
1382
                return -1;
1383
            }
1384

    
1385
            alpha[0] = alpha1[p][0] * bw_array[g] * bw_array[g];
1386
            alpha[1] = alpha1[p][1] * bw_array[g] * bw_array[g];
1387
            alpha[2] = alpha0[p][0] * bw_array[g];
1388
            alpha[3] = alpha0[p][1] * bw_array[g];
1389

    
1390
            for (i = 2 * t_env[0]; i < 2 * t_env[bs_num_env]; i++) {
1391
                const int idx = i + ENVELOPE_ADJUSTMENT_OFFSET;
1392
                X_high[k][idx][0] =
1393
                    X_low[p][idx - 2][0] * alpha[0] -
1394
                    X_low[p][idx - 2][1] * alpha[1] +
1395
                    X_low[p][idx - 1][0] * alpha[2] -
1396
                    X_low[p][idx - 1][1] * alpha[3] +
1397
                    X_low[p][idx][0];
1398
                X_high[k][idx][1] =
1399
                    X_low[p][idx - 2][1] * alpha[0] +
1400
                    X_low[p][idx - 2][0] * alpha[1] +
1401
                    X_low[p][idx - 1][1] * alpha[2] +
1402
                    X_low[p][idx - 1][0] * alpha[3] +
1403
                    X_low[p][idx][1];
1404
            }
1405
        }
1406
    }
1407
    if (k < sbr->m[1] + sbr->kx[1])
1408
        memset(X_high + k, 0, (sbr->m[1] + sbr->kx[1] - k) * sizeof(*X_high));
1409

    
1410
    return 0;
1411
}
1412

    
1413
/// Generate the subband filtered lowband
1414
static int sbr_x_gen(SpectralBandReplication *sbr, float X[2][32][64],
1415
                     const float X_low[32][40][2], const float Y[2][38][64][2],
1416
                     int ch)
1417
{
1418
    int k, i;
1419
    const int i_f = 32;
1420
    const int i_Temp = FFMAX(2*sbr->data[ch].t_env_num_env_old - i_f, 0);
1421
    memset(X, 0, 2*sizeof(*X));
1422
    for (k = 0; k < sbr->kx[0]; k++) {
1423
        for (i = 0; i < i_Temp; i++) {
1424
            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1425
            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1426
        }
1427
    }
1428
    for (; k < sbr->kx[0] + sbr->m[0]; k++) {
1429
        for (i = 0; i < i_Temp; i++) {
1430
            X[0][i][k] = Y[0][i + i_f][k][0];
1431
            X[1][i][k] = Y[0][i + i_f][k][1];
1432
        }
1433
    }
1434

    
1435
    for (k = 0; k < sbr->kx[1]; k++) {
1436
        for (i = i_Temp; i < i_f; i++) {
1437
            X[0][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][0];
1438
            X[1][i][k] = X_low[k][i + ENVELOPE_ADJUSTMENT_OFFSET][1];
1439
        }
1440
    }
1441
    for (; k < sbr->kx[1] + sbr->m[1]; k++) {
1442
        for (i = i_Temp; i < i_f; i++) {
1443
            X[0][i][k] = Y[1][i][k][0];
1444
            X[1][i][k] = Y[1][i][k][1];
1445
        }
1446
    }
1447
    return 0;
1448
}
1449

    
1450
/** High Frequency Adjustment (14496-3 sp04 p217) and Mapping
1451
 * (14496-3 sp04 p217)
1452
 */
1453
static void sbr_mapping(AACContext *ac, SpectralBandReplication *sbr,
1454
                        SBRData *ch_data, int e_a[2])
1455
{
1456
    int e, i, m;
1457

    
1458
    memset(ch_data->s_indexmapped[1], 0, 7*sizeof(ch_data->s_indexmapped[1]));
1459
    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1460
        const unsigned int ilim = sbr->n[ch_data->bs_freq_res[e + 1]];
1461
        uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1462
        int k;
1463

    
1464
        for (i = 0; i < ilim; i++)
1465
            for (m = table[i]; m < table[i + 1]; m++)
1466
                sbr->e_origmapped[e][m - sbr->kx[1]] = ch_data->env_facs[e+1][i];
1467

    
1468
        // ch_data->bs_num_noise > 1 => 2 noise floors
1469
        k = (ch_data->bs_num_noise > 1) && (ch_data->t_env[e] >= ch_data->t_q[1]);
1470
        for (i = 0; i < sbr->n_q; i++)
1471
            for (m = sbr->f_tablenoise[i]; m < sbr->f_tablenoise[i + 1]; m++)
1472
                sbr->q_mapped[e][m - sbr->kx[1]] = ch_data->noise_facs[k+1][i];
1473

    
1474
        for (i = 0; i < sbr->n[1]; i++) {
1475
            if (ch_data->bs_add_harmonic_flag) {
1476
                const unsigned int m_midpoint =
1477
                    (sbr->f_tablehigh[i] + sbr->f_tablehigh[i + 1]) >> 1;
1478

    
1479
                ch_data->s_indexmapped[e + 1][m_midpoint - sbr->kx[1]] = ch_data->bs_add_harmonic[i] *
1480
                    (e >= e_a[1] || (ch_data->s_indexmapped[0][m_midpoint - sbr->kx[1]] == 1));
1481
            }
1482
        }
1483

    
1484
        for (i = 0; i < ilim; i++) {
1485
            int additional_sinusoid_present = 0;
1486
            for (m = table[i]; m < table[i + 1]; m++) {
1487
                if (ch_data->s_indexmapped[e + 1][m - sbr->kx[1]]) {
1488
                    additional_sinusoid_present = 1;
1489
                    break;
1490
                }
1491
            }
1492
            memset(&sbr->s_mapped[e][table[i] - sbr->kx[1]], additional_sinusoid_present,
1493
                   (table[i + 1] - table[i]) * sizeof(sbr->s_mapped[e][0]));
1494
        }
1495
    }
1496

    
1497
    memcpy(ch_data->s_indexmapped[0], ch_data->s_indexmapped[ch_data->bs_num_env[1]], sizeof(ch_data->s_indexmapped[0]));
1498
}
1499

    
1500
/// Estimation of current envelope (14496-3 sp04 p218)
1501
static void sbr_env_estimate(float (*e_curr)[48], float X_high[64][40][2],
1502
                             SpectralBandReplication *sbr, SBRData *ch_data)
1503
{
1504
    int e, i, m;
1505

    
1506
    if (sbr->bs_interpol_freq) {
1507
        for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1508
            const float recip_env_size = 0.5f / (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1509
            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1510
            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1511

    
1512
            for (m = 0; m < sbr->m[1]; m++) {
1513
                float sum = 0.0f;
1514

    
1515
                for (i = ilb; i < iub; i++) {
1516
                    sum += X_high[m + sbr->kx[1]][i][0] * X_high[m + sbr->kx[1]][i][0] +
1517
                           X_high[m + sbr->kx[1]][i][1] * X_high[m + sbr->kx[1]][i][1];
1518
                }
1519
                e_curr[e][m] = sum * recip_env_size;
1520
            }
1521
        }
1522
    } else {
1523
        int k, p;
1524

    
1525
        for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1526
            const int env_size = 2 * (ch_data->t_env[e + 1] - ch_data->t_env[e]);
1527
            int ilb = ch_data->t_env[e]     * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1528
            int iub = ch_data->t_env[e + 1] * 2 + ENVELOPE_ADJUSTMENT_OFFSET;
1529
            const uint16_t *table = ch_data->bs_freq_res[e + 1] ? sbr->f_tablehigh : sbr->f_tablelow;
1530

    
1531
            for (p = 0; p < sbr->n[ch_data->bs_freq_res[e + 1]]; p++) {
1532
                float sum = 0.0f;
1533
                const int den = env_size * (table[p + 1] - table[p]);
1534

    
1535
                for (k = table[p]; k < table[p + 1]; k++) {
1536
                    for (i = ilb; i < iub; i++) {
1537
                        sum += X_high[k][i][0] * X_high[k][i][0] +
1538
                               X_high[k][i][1] * X_high[k][i][1];
1539
                    }
1540
                }
1541
                sum /= den;
1542
                for (k = table[p]; k < table[p + 1]; k++) {
1543
                    e_curr[e][k - sbr->kx[1]] = sum;
1544
                }
1545
            }
1546
        }
1547
    }
1548
}
1549

    
1550
/**
1551
 * Calculation of levels of additional HF signal components (14496-3 sp04 p219)
1552
 * and Calculation of gain (14496-3 sp04 p219)
1553
 */
1554
static void sbr_gain_calc(AACContext *ac, SpectralBandReplication *sbr,
1555
                          SBRData *ch_data, const int e_a[2])
1556
{
1557
    int e, k, m;
1558
    // max gain limits : -3dB, 0dB, 3dB, inf dB (limiter off)
1559
    static const float limgain[4] = { 0.70795, 1.0, 1.41254, 10000000000 };
1560

    
1561
    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1562
        int delta = !((e == e_a[1]) || (e == e_a[0]));
1563
        for (k = 0; k < sbr->n_lim; k++) {
1564
            float gain_boost, gain_max;
1565
            float sum[2] = { 0.0f, 0.0f };
1566
            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1567
                const float temp = sbr->e_origmapped[e][m] / (1.0f + sbr->q_mapped[e][m]);
1568
                sbr->q_m[e][m] = sqrtf(temp * sbr->q_mapped[e][m]);
1569
                sbr->s_m[e][m] = sqrtf(temp * ch_data->s_indexmapped[e + 1][m]);
1570
                if (!sbr->s_mapped[e][m]) {
1571
                    sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] /
1572
                                            ((1.0f + sbr->e_curr[e][m]) *
1573
                                             (1.0f + sbr->q_mapped[e][m] * delta)));
1574
                } else {
1575
                    sbr->gain[e][m] = sqrtf(sbr->e_origmapped[e][m] * sbr->q_mapped[e][m] /
1576
                                            ((1.0f + sbr->e_curr[e][m]) *
1577
                                             (1.0f + sbr->q_mapped[e][m])));
1578
                }
1579
            }
1580
            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1581
                sum[0] += sbr->e_origmapped[e][m];
1582
                sum[1] += sbr->e_curr[e][m];
1583
            }
1584
            gain_max = limgain[sbr->bs_limiter_gains] * sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1585
            gain_max = FFMIN(100000, gain_max);
1586
            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1587
                float q_m_max   = sbr->q_m[e][m] * gain_max / sbr->gain[e][m];
1588
                sbr->q_m[e][m]  = FFMIN(sbr->q_m[e][m], q_m_max);
1589
                sbr->gain[e][m] = FFMIN(sbr->gain[e][m], gain_max);
1590
            }
1591
            sum[0] = sum[1] = 0.0f;
1592
            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1593
                sum[0] += sbr->e_origmapped[e][m];
1594
                sum[1] += sbr->e_curr[e][m] * sbr->gain[e][m] * sbr->gain[e][m]
1595
                          + sbr->s_m[e][m] * sbr->s_m[e][m]
1596
                          + (delta && !sbr->s_m[e][m]) * sbr->q_m[e][m] * sbr->q_m[e][m];
1597
            }
1598
            gain_boost = sqrtf((FLT_EPSILON + sum[0]) / (FLT_EPSILON + sum[1]));
1599
            gain_boost = FFMIN(1.584893192, gain_boost);
1600
            for (m = sbr->f_tablelim[k] - sbr->kx[1]; m < sbr->f_tablelim[k + 1] - sbr->kx[1]; m++) {
1601
                sbr->gain[e][m] *= gain_boost;
1602
                sbr->q_m[e][m]  *= gain_boost;
1603
                sbr->s_m[e][m]  *= gain_boost;
1604
            }
1605
        }
1606
    }
1607
}
1608

    
1609
/// Assembling HF Signals (14496-3 sp04 p220)
1610
static void sbr_hf_assemble(float Y[2][38][64][2], const float X_high[64][40][2],
1611
                            SpectralBandReplication *sbr, SBRData *ch_data,
1612
                            const int e_a[2])
1613
{
1614
    int e, i, j, m;
1615
    const int h_SL = 4 * !sbr->bs_smoothing_mode;
1616
    const int kx = sbr->kx[1];
1617
    const int m_max = sbr->m[1];
1618
    static const float h_smooth[5] = {
1619
        0.33333333333333,
1620
        0.30150283239582,
1621
        0.21816949906249,
1622
        0.11516383427084,
1623
        0.03183050093751,
1624
    };
1625
    static const int8_t phi[2][4] = {
1626
        {  1,  0, -1,  0}, // real
1627
        {  0,  1,  0, -1}, // imaginary
1628
    };
1629
    float (*g_temp)[48] = ch_data->g_temp, (*q_temp)[48] = ch_data->q_temp;
1630
    int indexnoise = ch_data->f_indexnoise;
1631
    int indexsine  = ch_data->f_indexsine;
1632
    memcpy(Y[0], Y[1], sizeof(Y[0]));
1633

    
1634
    if (sbr->reset) {
1635
        for (i = 0; i < h_SL; i++) {
1636
            memcpy(g_temp[i + 2*ch_data->t_env[0]], sbr->gain[0], m_max * sizeof(sbr->gain[0][0]));
1637
            memcpy(q_temp[i + 2*ch_data->t_env[0]], sbr->q_m[0],  m_max * sizeof(sbr->q_m[0][0]));
1638
        }
1639
    } else if (h_SL) {
1640
        memcpy(g_temp[2*ch_data->t_env[0]], g_temp[2*ch_data->t_env_num_env_old], 4*sizeof(g_temp[0]));
1641
        memcpy(q_temp[2*ch_data->t_env[0]], q_temp[2*ch_data->t_env_num_env_old], 4*sizeof(q_temp[0]));
1642
    }
1643

    
1644
    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1645
        for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1646
            memcpy(g_temp[h_SL + i], sbr->gain[e], m_max * sizeof(sbr->gain[0][0]));
1647
            memcpy(q_temp[h_SL + i], sbr->q_m[e],  m_max * sizeof(sbr->q_m[0][0]));
1648
        }
1649
    }
1650

    
1651
    for (e = 0; e < ch_data->bs_num_env[1]; e++) {
1652
        for (i = 2 * ch_data->t_env[e]; i < 2 * ch_data->t_env[e + 1]; i++) {
1653
            int phi_sign = (1 - 2*(kx & 1));
1654

    
1655
            if (h_SL && e != e_a[0] && e != e_a[1]) {
1656
                for (m = 0; m < m_max; m++) {
1657
                    const int idx1 = i + h_SL;
1658
                    float g_filt = 0.0f;
1659
                    for (j = 0; j <= h_SL; j++)
1660
                        g_filt += g_temp[idx1 - j][m] * h_smooth[j];
1661
                    Y[1][i][m + kx][0] =
1662
                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1663
                    Y[1][i][m + kx][1] =
1664
                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1665
                }
1666
            } else {
1667
                for (m = 0; m < m_max; m++) {
1668
                    const float g_filt = g_temp[i + h_SL][m];
1669
                    Y[1][i][m + kx][0] =
1670
                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][0] * g_filt;
1671
                    Y[1][i][m + kx][1] =
1672
                        X_high[m + kx][i + ENVELOPE_ADJUSTMENT_OFFSET][1] * g_filt;
1673
                }
1674
            }
1675

    
1676
            if (e != e_a[0] && e != e_a[1]) {
1677
                for (m = 0; m < m_max; m++) {
1678
                    indexnoise = (indexnoise + 1) & 0x1ff;
1679
                    if (sbr->s_m[e][m]) {
1680
                        Y[1][i][m + kx][0] +=
1681
                            sbr->s_m[e][m] * phi[0][indexsine];
1682
                        Y[1][i][m + kx][1] +=
1683
                            sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1684
                    } else {
1685
                        float q_filt;
1686
                        if (h_SL) {
1687
                            const int idx1 = i + h_SL;
1688
                            q_filt = 0.0f;
1689
                            for (j = 0; j <= h_SL; j++)
1690
                                q_filt += q_temp[idx1 - j][m] * h_smooth[j];
1691
                        } else {
1692
                            q_filt = q_temp[i][m];
1693
                        }
1694
                        Y[1][i][m + kx][0] +=
1695
                            q_filt * sbr_noise_table[indexnoise][0];
1696
                        Y[1][i][m + kx][1] +=
1697
                            q_filt * sbr_noise_table[indexnoise][1];
1698
                    }
1699
                    phi_sign = -phi_sign;
1700
                }
1701
            } else {
1702
                indexnoise = (indexnoise + m_max) & 0x1ff;
1703
                for (m = 0; m < m_max; m++) {
1704
                    Y[1][i][m + kx][0] +=
1705
                        sbr->s_m[e][m] * phi[0][indexsine];
1706
                    Y[1][i][m + kx][1] +=
1707
                        sbr->s_m[e][m] * (phi[1][indexsine] * phi_sign);
1708
                    phi_sign = -phi_sign;
1709
                }
1710
            }
1711
            indexsine = (indexsine + 1) & 3;
1712
        }
1713
    }
1714
    ch_data->f_indexnoise = indexnoise;
1715
    ch_data->f_indexsine  = indexsine;
1716
}
1717

    
1718
void ff_sbr_dequant(AACContext *ac, SpectralBandReplication *sbr, int id_aac)
1719
{
1720
    if (sbr->start) {
1721
        sbr_dequant(sbr, id_aac);
1722
    }
1723
}
1724

    
1725
void ff_sbr_apply(AACContext *ac, SpectralBandReplication *sbr, int ch,
1726
                  const float* in, float* out)
1727
{
1728
    int downsampled = ac->m4ac.ext_sample_rate < sbr->sample_rate;
1729

    
1730
    /* decode channel */
1731
    sbr_qmf_analysis(&ac->dsp, &sbr->rdft, in, sbr->data[ch].analysis_filterbank_samples,
1732
                     (float*)sbr->qmf_filter_scratch,
1733
                     sbr->data[ch].W, ac->add_bias, 1/(-1024 * ac->sf_scale));
1734
    sbr_lf_gen(ac, sbr, sbr->X_low, sbr->data[ch].W);
1735
    if (sbr->start) {
1736
        sbr_hf_inverse_filter(sbr->alpha0, sbr->alpha1, sbr->X_low, sbr->k[0]);
1737
        sbr_chirp(sbr, &sbr->data[ch]);
1738
        sbr_hf_gen(ac, sbr, sbr->X_high, sbr->X_low, sbr->alpha0, sbr->alpha1,
1739
                   sbr->data[ch].bw_array, sbr->data[ch].t_env,
1740
                   sbr->data[ch].bs_num_env[1]);
1741

    
1742
        // hf_adj
1743
        sbr_mapping(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1744
        sbr_env_estimate(sbr->e_curr, sbr->X_high, sbr, &sbr->data[ch]);
1745
        sbr_gain_calc(ac, sbr, &sbr->data[ch], sbr->data[ch].e_a);
1746
        sbr_hf_assemble(sbr->data[ch].Y, sbr->X_high, sbr, &sbr->data[ch],
1747
                        sbr->data[ch].e_a);
1748
    }
1749

    
1750
    /* synthesis */
1751
    sbr_x_gen(sbr, sbr->X, sbr->X_low, sbr->data[ch].Y, ch);
1752
    sbr_qmf_synthesis(&ac->dsp, &sbr->mdct, out, sbr->X, sbr->qmf_filter_scratch,
1753
                      sbr->data[ch].synthesis_filterbank_samples,
1754
                      &sbr->data[ch].synthesis_filterbank_samples_offset,
1755
                      downsampled,
1756
                      ac->add_bias, -1024 * ac->sf_scale);
1757
}