GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/truespeech.c Lines: 181 186 97.3 %
Date: 2021-04-14 23:45:22 Branches: 69 72 95.8 %

Line Branch Exec Source
1
/*
2
 * DSP Group TrueSpeech compatible decoder
3
 * Copyright (c) 2005 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
6
 *
7
 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
9
 * 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.
11
 *
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 * FFmpeg is distributed in the hope that it will be useful,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * Lesser General Public License for more details.
16
 *
17
 * 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
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20
 */
21
22
#include "libavutil/channel_layout.h"
23
#include "libavutil/intreadwrite.h"
24
#include "libavutil/mem_internal.h"
25
26
#include "avcodec.h"
27
#include "bswapdsp.h"
28
#include "get_bits.h"
29
#include "internal.h"
30
31
#include "truespeech_data.h"
32
/**
33
 * @file
34
 * TrueSpeech decoder.
35
 */
36
37
/**
38
 * TrueSpeech decoder context
39
 */
40
typedef struct TSContext {
41
    BswapDSPContext bdsp;
42
    /* input data */
43
    DECLARE_ALIGNED(16, uint8_t, buffer)[32];
44
    int16_t vector[8];  ///< input vector: 5/5/4/4/4/3/3/3
45
    int offset1[2];     ///< 8-bit value, used in one copying offset
46
    int offset2[4];     ///< 7-bit value, encodes offsets for copying and for two-point filter
47
    int pulseoff[4];    ///< 4-bit offset of pulse values block
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    int pulsepos[4];    ///< 27-bit variable, encodes 7 pulse positions
49
    int pulseval[4];    ///< 7x2-bit pulse values
50
    int flag;           ///< 1-bit flag, shows how to choose filters
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    /* temporary data */
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    int filtbuf[146];   // some big vector used for storing filters
53
    int prevfilt[8];    // filter from previous frame
54
    int16_t tmp1[8];    // coefficients for adding to out
55
    int16_t tmp2[8];    // coefficients for adding to out
56
    int16_t tmp3[8];    // coefficients for adding to out
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    int16_t cvector[8]; // correlated input vector
58
    int filtval;        // gain value for one function
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    int16_t newvec[60]; // tmp vector
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    int16_t filters[32]; // filters for every subframe
61
} TSContext;
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63
2
static av_cold int truespeech_decode_init(AVCodecContext * avctx)
64
{
65
2
    TSContext *c = avctx->priv_data;
66
67
2
    if (avctx->channels != 1) {
68
        avpriv_request_sample(avctx, "Channel count %d", avctx->channels);
69
        return AVERROR_PATCHWELCOME;
70
    }
71
72
2
    avctx->channel_layout = AV_CH_LAYOUT_MONO;
73
2
    avctx->sample_fmt     = AV_SAMPLE_FMT_S16;
74
75
2
    ff_bswapdsp_init(&c->bdsp);
76
77
2
    return 0;
78
}
79
80
1442
static void truespeech_read_frame(TSContext *dec, const uint8_t *input)
81
{
82
    GetBitContext gb;
83
84
1442
    dec->bdsp.bswap_buf((uint32_t *) dec->buffer, (const uint32_t *) input, 8);
85
1442
    init_get_bits(&gb, dec->buffer, 32 * 8);
86
87
1442
    dec->vector[7] = ts_codebook[7][get_bits(&gb, 3)];
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1442
    dec->vector[6] = ts_codebook[6][get_bits(&gb, 3)];
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1442
    dec->vector[5] = ts_codebook[5][get_bits(&gb, 3)];
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1442
    dec->vector[4] = ts_codebook[4][get_bits(&gb, 4)];
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1442
    dec->vector[3] = ts_codebook[3][get_bits(&gb, 4)];
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1442
    dec->vector[2] = ts_codebook[2][get_bits(&gb, 4)];
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1442
    dec->vector[1] = ts_codebook[1][get_bits(&gb, 5)];
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1442
    dec->vector[0] = ts_codebook[0][get_bits(&gb, 5)];
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1442
    dec->flag      = get_bits1(&gb);
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97
1442
    dec->offset1[0] = get_bits(&gb, 4) << 4;
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1442
    dec->offset2[3] = get_bits(&gb, 7);
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1442
    dec->offset2[2] = get_bits(&gb, 7);
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1442
    dec->offset2[1] = get_bits(&gb, 7);
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1442
    dec->offset2[0] = get_bits(&gb, 7);
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1442
    dec->offset1[1]  = get_bits(&gb, 4);
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1442
    dec->pulseval[1] = get_bits(&gb, 14);
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1442
    dec->pulseval[0] = get_bits(&gb, 14);
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1442
    dec->offset1[1] |= get_bits(&gb, 4) << 4;
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1442
    dec->pulseval[3] = get_bits(&gb, 14);
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1442
    dec->pulseval[2] = get_bits(&gb, 14);
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111
1442
    dec->offset1[0] |= get_bits1(&gb);
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1442
    dec->pulsepos[0] = get_bits_long(&gb, 27);
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1442
    dec->pulseoff[0] = get_bits(&gb, 4);
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1442
    dec->offset1[0] |= get_bits1(&gb) << 1;
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1442
    dec->pulsepos[1] = get_bits_long(&gb, 27);
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1442
    dec->pulseoff[1] = get_bits(&gb, 4);
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119
1442
    dec->offset1[0] |= get_bits1(&gb) << 2;
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1442
    dec->pulsepos[2] = get_bits_long(&gb, 27);
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1442
    dec->pulseoff[2] = get_bits(&gb, 4);
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1442
    dec->offset1[0] |= get_bits1(&gb) << 3;
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1442
    dec->pulsepos[3] = get_bits_long(&gb, 27);
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1442
    dec->pulseoff[3] = get_bits(&gb, 4);
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1442
}
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1442
static void truespeech_correlate_filter(TSContext *dec)
129
{
130
    int16_t tmp[8];
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    int i, j;
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133
12978
    for(i = 0; i < 8; i++){
134
11536
        if(i > 0){
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10094
            memcpy(tmp, dec->cvector, i * sizeof(*tmp));
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50470
            for(j = 0; j < i; j++)
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40376
                dec->cvector[j] += (tmp[i - j - 1] * dec->vector[i] + 0x4000) >> 15;
138
        }
139
11536
        dec->cvector[i] = (8 - dec->vector[i]) >> 3;
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    }
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12978
    for(i = 0; i < 8; i++)
142
11536
        dec->cvector[i] = (dec->cvector[i] * ts_decay_994_1000[i]) >> 15;
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144
1442
    dec->filtval = dec->vector[0];
145
1442
}
146
147
1442
static void truespeech_filters_merge(TSContext *dec)
148
{
149
    int i;
150
151
1442
    if(!dec->flag){
152
99
        for(i = 0; i < 8; i++){
153
88
            dec->filters[i + 0] = dec->prevfilt[i];
154
88
            dec->filters[i + 8] = dec->prevfilt[i];
155
        }
156
    }else{
157
12879
        for(i = 0; i < 8; i++){
158
11448
            dec->filters[i + 0]=(dec->cvector[i] * 21846 + dec->prevfilt[i] * 10923 + 16384) >> 15;
159
11448
            dec->filters[i + 8]=(dec->cvector[i] * 10923 + dec->prevfilt[i] * 21846 + 16384) >> 15;
160
        }
161
    }
162
12978
    for(i = 0; i < 8; i++){
163
11536
        dec->filters[i + 16] = dec->cvector[i];
164
11536
        dec->filters[i + 24] = dec->cvector[i];
165
    }
166
1442
}
167
168
5768
static void truespeech_apply_twopoint_filter(TSContext *dec, int quart)
169
{
170
    int16_t tmp[146 + 60], *ptr0, *ptr1;
171
    const int16_t *filter;
172
    int i, t, off;
173
174
5768
    t = dec->offset2[quart];
175
5768
    if(t == 127){
176
358
        memset(dec->newvec, 0, 60 * sizeof(*dec->newvec));
177
358
        return;
178
    }
179
795270
    for(i = 0; i < 146; i++)
180
789860
        tmp[i] = dec->filtbuf[i];
181
5410
    off = (t / 25) + dec->offset1[quart >> 1] + 18;
182
5410
    off = av_clip(off, 0, 145);
183
5410
    ptr0 = tmp + 145 - off;
184
5410
    ptr1 = tmp + 146;
185
5410
    filter = ts_order2_coeffs + (t % 25) * 2;
186
330010
    for(i = 0; i < 60; i++){
187
324600
        t = (ptr0[0] * filter[0] + ptr0[1] * filter[1] + 0x2000) >> 14;
188
324600
        ptr0++;
189
324600
        dec->newvec[i] = t;
190
324600
        ptr1[i] = t;
191
    }
192
}
193
194
5768
static void truespeech_place_pulses(TSContext *dec, int16_t *out, int quart)
195
{
196
    int16_t tmp[7];
197
    int i, j, t;
198
    const int16_t *ptr1;
199
    int16_t *ptr2;
200
    int coef;
201
202
5768
    memset(out, 0, 60 * sizeof(*out));
203
46144
    for(i = 0; i < 7; i++) {
204
40376
        t = dec->pulseval[quart] & 3;
205
40376
        dec->pulseval[quart] >>= 2;
206
40376
        tmp[6 - i] = ts_pulse_scales[dec->pulseoff[quart] * 4 + t];
207
    }
208
209
5768
    coef = dec->pulsepos[quart] >> 15;
210
5768
    ptr1 = ts_pulse_values + 30;
211
5768
    ptr2 = tmp;
212

136138
    for(i = 0, j = 3; (i < 30) && (j > 0); i++){
213
130370
        t = *ptr1++;
214
130370
        if(coef >= t)
215
113066
            coef -= t;
216
        else{
217
17304
            out[i] = *ptr2++;
218
17304
            ptr1 += 30;
219
17304
            j--;
220
        }
221
    }
222
5768
    coef = dec->pulsepos[quart] & 0x7FFF;
223
5768
    ptr1 = ts_pulse_values;
224

141397
    for(i = 30, j = 4; (i < 60) && (j > 0); i++){
225
135629
        t = *ptr1++;
226
135629
        if(coef >= t)
227
112557
            coef -= t;
228
        else{
229
23072
            out[i] = *ptr2++;
230
23072
            ptr1 += 30;
231
23072
            j--;
232
        }
233
    }
234
235
5768
}
236
237
5768
static void truespeech_update_filters(TSContext *dec, int16_t *out, int quart)
238
{
239
    int i;
240
241
5768
    memmove(dec->filtbuf, &dec->filtbuf[60], 86 * sizeof(*dec->filtbuf));
242
351848
    for(i = 0; i < 60; i++){
243
346080
        dec->filtbuf[i + 86] = out[i] + dec->newvec[i] - (dec->newvec[i] >> 3);
244
346080
        out[i] += dec->newvec[i];
245
    }
246
5768
}
247
248
5768
static void truespeech_synth(TSContext *dec, int16_t *out, int quart)
249
{
250
    int i,k;
251
    int t[8];
252
    int16_t *ptr0, *ptr1;
253
254
5768
    ptr0 = dec->tmp1;
255
5768
    ptr1 = dec->filters + quart * 8;
256
351848
    for(i = 0; i < 60; i++){
257
346080
        int sum = 0;
258
3114720
        for(k = 0; k < 8; k++)
259
2768640
            sum += ptr0[k] * (unsigned)ptr1[k];
260
346080
        sum = out[i] + ((int)(sum + 0x800U) >> 12);
261
346080
        out[i] = av_clip(sum, -0x7FFE, 0x7FFE);
262
2768640
        for(k = 7; k > 0; k--)
263
2422560
            ptr0[k] = ptr0[k - 1];
264
346080
        ptr0[0] = out[i];
265
    }
266
267
51912
    for(i = 0; i < 8; i++)
268
46144
        t[i] = (ts_decay_35_64[i] * ptr1[i]) >> 15;
269
270
5768
    ptr0 = dec->tmp2;
271
351848
    for(i = 0; i < 60; i++){
272
346080
        int sum = 0;
273
3114720
        for(k = 0; k < 8; k++)
274
2768640
            sum += ptr0[k] * t[k];
275
2768640
        for(k = 7; k > 0; k--)
276
2422560
            ptr0[k] = ptr0[k - 1];
277
346080
        ptr0[0] = out[i];
278
346080
        out[i] += (- sum) >> 12;
279
    }
280
281
51912
    for(i = 0; i < 8; i++)
282
46144
        t[i] = (ts_decay_3_4[i] * ptr1[i]) >> 15;
283
284
5768
    ptr0 = dec->tmp3;
285
351848
    for(i = 0; i < 60; i++){
286
346080
        int sum = out[i] * (1 << 12);
287
3114720
        for(k = 0; k < 8; k++)
288
2768640
            sum += ptr0[k] * t[k];
289
2768640
        for(k = 7; k > 0; k--)
290
2422560
            ptr0[k] = ptr0[k - 1];
291
346080
        ptr0[0] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
292
293
346080
        sum = ((ptr0[1] * (dec->filtval - (dec->filtval >> 2))) >> 4) + sum;
294
346080
        sum = sum - (sum >> 3);
295
346080
        out[i] = av_clip((sum + 0x800) >> 12, -0x7FFE, 0x7FFE);
296
    }
297
5768
}
298
299
1442
static void truespeech_save_prevvec(TSContext *c)
300
{
301
    int i;
302
303
12978
    for(i = 0; i < 8; i++)
304
11536
        c->prevfilt[i] = c->cvector[i];
305
1442
}
306
307
12
static int truespeech_decode_frame(AVCodecContext *avctx, void *data,
308
                                   int *got_frame_ptr, AVPacket *avpkt)
309
{
310
12
    AVFrame *frame     = data;
311
12
    const uint8_t *buf = avpkt->data;
312
12
    int buf_size = avpkt->size;
313
12
    TSContext *c = avctx->priv_data;
314
315
    int i, j;
316
    int16_t *samples;
317
    int iterations, ret;
318
319
12
    iterations = buf_size / 32;
320
321
12
    if (!iterations) {
322
        av_log(avctx, AV_LOG_ERROR,
323
               "Too small input buffer (%d bytes), need at least 32 bytes\n", buf_size);
324
        return -1;
325
    }
326
327
    /* get output buffer */
328
12
    frame->nb_samples = iterations * 240;
329
12
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
330
        return ret;
331
12
    samples = (int16_t *)frame->data[0];
332
333
12
    memset(samples, 0, iterations * 240 * sizeof(*samples));
334
335
1454
    for(j = 0; j < iterations; j++) {
336
1442
        truespeech_read_frame(c, buf);
337
1442
        buf += 32;
338
339
1442
        truespeech_correlate_filter(c);
340
1442
        truespeech_filters_merge(c);
341
342
7210
        for(i = 0; i < 4; i++) {
343
5768
            truespeech_apply_twopoint_filter(c, i);
344
5768
            truespeech_place_pulses  (c, samples, i);
345
5768
            truespeech_update_filters(c, samples, i);
346
5768
            truespeech_synth         (c, samples, i);
347
5768
            samples += 60;
348
        }
349
350
1442
        truespeech_save_prevvec(c);
351
    }
352
353
12
    *got_frame_ptr = 1;
354
355
12
    return buf_size;
356
}
357
358
AVCodec ff_truespeech_decoder = {
359
    .name           = "truespeech",
360
    .long_name      = NULL_IF_CONFIG_SMALL("DSP Group TrueSpeech"),
361
    .type           = AVMEDIA_TYPE_AUDIO,
362
    .id             = AV_CODEC_ID_TRUESPEECH,
363
    .priv_data_size = sizeof(TSContext),
364
    .init           = truespeech_decode_init,
365
    .decode         = truespeech_decode_frame,
366
    .capabilities   = AV_CODEC_CAP_DR1,
367
};