GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc8.c Lines: 220 239 92.1 %
Date: 2020-11-28 20:53:16 Branches: 118 137 86.1 %

Line Branch Exec Source
1
/*
2
 * Musepack SV8 decoder
3
 * Copyright (c) 2007 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
10
 * version 2.1 of the License, or (at your option) any later version.
11
 *
12
 * 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
18
 * 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
/**
23
 * @file
24
 * MPEG Audio Layer 1/2 -like codec with frames of 1152 samples
25
 * divided into 32 subbands.
26
 */
27
28
#include "libavutil/channel_layout.h"
29
#include "libavutil/lfg.h"
30
#include "avcodec.h"
31
#include "get_bits.h"
32
#include "internal.h"
33
#include "mpegaudiodsp.h"
34
35
#include "mpc.h"
36
#include "mpc8data.h"
37
#include "mpc8huff.h"
38
39
static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
40
static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
41
42
static const int q3_offsets[2] = { MPC8_Q3_OFFSET, MPC8_Q4_OFFSET };
43
static const int quant_offsets[6] = { MPC8_Q5_OFFSET, MPC8_Q6_OFFSET, MPC8_Q7_OFFSET, MPC8_Q8_OFFSET };
44
45
7795
static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
46
{
47
7795
    int len = mpc8_cnk_len[k-1][n-1] - 1;
48
7795
    int code = len ? get_bits_long(gb, len) : 0;
49
50
7795
    if (code >= mpc8_cnk_lost[k-1][n-1])
51
3746
        code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
52
53
7795
    return code;
54
}
55
56
7335
static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
57
{
58
7335
    int bits = 0;
59
7335
    const uint32_t * C = mpc8_cnk[k-1];
60
7335
    int code = mpc8_dec_base(gb, k, n);
61
62
    do {
63
109711
        n--;
64
109711
        if (code >= C[n]) {
65
41077
            bits |= 1U << n;
66
41077
            code -= C[n];
67
41077
            C -= 32;
68
41077
            k--;
69
        }
70
109711
    } while(k > 0);
71
72
7335
    return bits;
73
}
74
75
460
static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
76
{
77
460
    if(mpc8_cnk_len[0][m] < 1) return 0;
78
460
    return mpc8_dec_base(gb, 1, m+1);
79
}
80
81
7492
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
82
{
83
7492
    int mask = 0;
84
85

7492
    if(t && t != size)
86
7335
         mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
87
7492
    if((t << 1) > size) mask = ~mask;
88
89
7492
    return mask;
90
}
91
92
static const uint16_t vlc_offsets[13] = {
93
    0, 640, 1184, 1748, 2298, 2426, 2554, 3066, 3578, 4106, 4618, 5196, 5708
94
};
95
96
3
static av_cold int mpc8_decode_init(AVCodecContext * avctx)
97
{
98
    int i;
99
3
    MPCContext *c = avctx->priv_data;
100
    GetBitContext gb;
101
    static int vlc_initialized = 0;
102
    int channels;
103
104
    static VLC_TYPE band_table[542][2];
105
    static VLC_TYPE q1_table[520][2];
106
    static VLC_TYPE q9up_table[524][2];
107
    static VLC_TYPE scfi0_table[1 << MPC8_SCFI0_BITS][2];
108
    static VLC_TYPE scfi1_table[1 << MPC8_SCFI1_BITS][2];
109
    static VLC_TYPE dscf0_table[560][2];
110
    static VLC_TYPE dscf1_table[598][2];
111
    static VLC_TYPE q3_0_table[512][2];
112
    static VLC_TYPE q3_1_table[516][2];
113
    static VLC_TYPE codes_table[5708][2];
114
115
3
    if(avctx->extradata_size < 2){
116
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
117
        return -1;
118
    }
119
3
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
120
3
    av_lfg_init(&c->rnd, 0xDEADBEEF);
121
3
    ff_mpadsp_init(&c->mpadsp);
122
123
3
    init_get_bits(&gb, avctx->extradata, 16);
124
125
3
    skip_bits(&gb, 3);//sample rate
126
3
    c->maxbands = get_bits(&gb, 5) + 1;
127
3
    if (c->maxbands >= BANDS) {
128
        av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
129
        return AVERROR_INVALIDDATA;
130
    }
131
3
    channels = get_bits(&gb, 4) + 1;
132
3
    if (channels > 2) {
133
        avpriv_request_sample(avctx, "Multichannel MPC SV8");
134
        return AVERROR_PATCHWELCOME;
135
    }
136
3
    c->MSS = get_bits1(&gb);
137
3
    c->frames = 1 << (get_bits(&gb, 3) * 2);
138
139
3
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
140
3
    avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
141
3
    avctx->channels = channels;
142
143
3
    if(vlc_initialized) return 0;
144
2
    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
145
146
2
    band_vlc.table = band_table;
147
2
    band_vlc.table_allocated = 542;
148
2
    init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
149
             mpc8_bands_bits,  1, 1,
150
             mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
151
152
2
    q1_vlc.table = q1_table;
153
2
    q1_vlc.table_allocated = 520;
154
2
    init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
155
             mpc8_q1_bits,  1, 1,
156
             mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
157
2
    q9up_vlc.table = q9up_table;
158
2
    q9up_vlc.table_allocated = 524;
159
2
    init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
160
             mpc8_q9up_bits,  1, 1,
161
             mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
162
163
2
    scfi_vlc[0].table = scfi0_table;
164
2
    scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
165
2
    init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
166
             mpc8_scfi0_bits,  1, 1,
167
             mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
168
2
    scfi_vlc[1].table = scfi1_table;
169
2
    scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
170
2
    init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
171
             mpc8_scfi1_bits,  1, 1,
172
             mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
173
174
2
    dscf_vlc[0].table = dscf0_table;
175
2
    dscf_vlc[0].table_allocated = 560;
176
2
    init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
177
             mpc8_dscf0_bits,  1, 1,
178
             mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
179
2
    dscf_vlc[1].table = dscf1_table;
180
2
    dscf_vlc[1].table_allocated = 598;
181
2
    init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
182
             mpc8_dscf1_bits,  1, 1,
183
             mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
184
185
2
    q3_vlc[0].table = q3_0_table;
186
2
    q3_vlc[0].table_allocated = 512;
187
2
    ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
188
             mpc8_q3_bits,  1, 1,
189
             mpc8_q3_codes, 1, 1,
190
             mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
191
2
    q3_vlc[1].table = q3_1_table;
192
2
    q3_vlc[1].table_allocated = 516;
193
2
    ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
194
             mpc8_q4_bits,  1, 1,
195
             mpc8_q4_codes, 1, 1,
196
             mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
197
198
6
    for(i = 0; i < 2; i++){
199
4
        res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
200
4
        res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
201
4
        init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
202
                 &mpc8_res_bits[i],  1, 1,
203
                 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
204
205
4
        q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
206
4
        q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
207
4
        init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
208
                 &mpc8_q2_bits[i],  1, 1,
209
                 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
210
211
4
        quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
212
4
        quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
213
4
        init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
214
                 &mpc8_q5_bits[i],  1, 1,
215
                 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
216
4
        quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
217
4
        quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
218
4
        init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
219
                 &mpc8_q6_bits[i],  1, 1,
220
                 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
221
4
        quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
222
4
        quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
223
4
        init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
224
                 &mpc8_q7_bits[i],  1, 1,
225
                 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
226
4
        quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
227
4
        quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
228
4
        init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
229
                 &mpc8_q8_bits[i],  1, 1,
230
                 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
231
    }
232
2
    vlc_initialized = 1;
233
2
    ff_mpa_synth_init_fixed();
234
235
2
    return 0;
236
}
237
238
457
static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
239
                             int *got_frame_ptr, AVPacket *avpkt)
240
{
241
457
    AVFrame *frame     = data;
242
457
    const uint8_t *buf = avpkt->data;
243
457
    int buf_size = avpkt->size;
244
457
    MPCContext *c = avctx->priv_data;
245
457
    GetBitContext gb2, *gb = &gb2;
246
    int i, j, k, ch, cnt, res, t;
247
457
    Band *bands = c->bands;
248
    int off;
249
    int maxband, keyframe;
250
    int last[2];
251
252
457
    keyframe = c->cur_frame == 0;
253
254
457
    if(keyframe){
255
8
        memset(c->Q, 0, sizeof(c->Q));
256
8
        c->last_bits_used = 0;
257
    }
258
457
    if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
259
        return res;
260
261
457
    skip_bits(gb, c->last_bits_used & 7);
262
263
457
    if(keyframe)
264
8
        maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
265
    else{
266
449
        maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
267
449
        if(maxband > 32) maxband -= 33;
268
    }
269
270
457
    if (get_bits_left(gb) < 0) {
271
1
        *got_frame_ptr = 0;
272
1
        return buf_size;
273
    }
274
275
456
    if(maxband > c->maxbands + 1) {
276
        av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
277
        return AVERROR_INVALIDDATA;
278
    }
279
456
    c->last_max_band = maxband;
280
281
    /* read subband indexes */
282
456
    if(maxband){
283
452
        last[0] = last[1] = 0;
284
10866
        for(i = maxband - 1; i >= 0; i--){
285
31242
            for(ch = 0; ch < 2; ch++){
286
20828
                last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
287
20828
                if(last[ch] > 15) last[ch] -= 17;
288
20828
                bands[i].res[ch] = last[ch];
289
            }
290
        }
291
452
        if(c->MSS){
292
            int mask;
293
294
452
            cnt = 0;
295
10866
            for(i = 0; i < maxband; i++)
296

10414
                if(bands[i].res[0] || bands[i].res[1])
297
10414
                    cnt++;
298
452
            t = mpc8_get_mod_golomb(gb, cnt);
299
452
            mask = mpc8_get_mask(gb, cnt, t);
300
10866
            for(i = maxband - 1; i >= 0; i--)
301

10414
                if(bands[i].res[0] || bands[i].res[1]){
302
10414
                    bands[i].msf = mask & 1;
303
10414
                    mask >>= 1;
304
                }
305
        }
306
    }
307
2810
    for(i = maxband; i < c->maxbands; i++)
308
2354
        bands[i].res[0] = bands[i].res[1] = 0;
309
310
456
    if(keyframe){
311
264
        for(i = 0; i < 32; i++)
312
256
            c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
313
    }
314
315
10870
    for(i = 0; i < maxband; i++){
316

10414
        if(bands[i].res[0] || bands[i].res[1]){
317
10414
            cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
318
10414
            if(cnt >= 0){
319
10414
                t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
320
10414
                if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
321
10414
                if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
322
            }
323
        }
324
    }
325
326
10870
    for(i = 0; i < maxband; i++){
327
31242
        for(ch = 0; ch < 2; ch++){
328
20828
            if(!bands[i].res[ch]) continue;
329
330
18282
            if(c->oldDSCF[ch][i]){
331
388
                bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
332
388
                c->oldDSCF[ch][i] = 0;
333
            }else{
334
17894
                t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
335
17894
                if(t == 64)
336
50
                    t += get_bits(gb, 6);
337
17894
                bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
338
            }
339
54846
            for(j = 0; j < 2; j++){
340
36564
                if((bands[i].scfi[ch] << j) & 2)
341
23434
                    bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
342
                else{
343
13130
                    t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
344
13130
                    if(t == 31)
345
98
                        t = 64 + get_bits(gb, 6);
346
13130
                    bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
347
                }
348
            }
349
        }
350
    }
351
352
10870
    for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
353
31242
        for(ch = 0; ch < 2; ch++){
354
20828
            res = bands[i].res[ch];
355

20828
            switch(res){
356
            case -1:
357
                for(j = 0; j < SAMPLES_PER_BAND; j++)
358
                    c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
359
                break;
360
2546
            case 0:
361
2546
                break;
362
3520
            case 1:
363
10560
                for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
364
7040
                    cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
365
7040
                    t = mpc8_get_mask(gb, 18, cnt);
366
133760
                    for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
367
126720
                        c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
368
126720
                                                ? (get_bits1(gb) << 1) - 1 : 0;
369
                }
370
3520
                break;
371
6121
            case 2:
372
6121
                cnt = 6;//2*mpc8_thres[res]
373
79573
                for(j = 0; j < SAMPLES_PER_BAND; j += 3){
374
73452
                    t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
375
73452
                    c->Q[ch][off + j + 0] = mpc8_idx50[t];
376
73452
                    c->Q[ch][off + j + 1] = mpc8_idx51[t];
377
73452
                    c->Q[ch][off + j + 2] = mpc8_idx52[t];
378
73452
                    cnt = (cnt >> 1) + mpc8_huffq2[t];
379
                }
380
6121
                break;
381
4822
            case 3:
382
            case 4:
383
91618
                for(j = 0; j < SAMPLES_PER_BAND; j += 2){
384
86796
                    t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
385
86796
                    c->Q[ch][off + j + 1] = t >> 4;
386
86796
                    c->Q[ch][off + j + 0] = sign_extend(t, 4);
387
                }
388
4822
                break;
389
3454
            case 5:
390
            case 6:
391
            case 7:
392
            case 8:
393
3454
                cnt = 2 * mpc8_thres[res];
394
127798
                for(j = 0; j < SAMPLES_PER_BAND; j++){
395
124344
                    t = get_vlc2(gb, quant_vlc[res - 5][cnt > mpc8_thres[res]].table, quant_vlc[res - 5][cnt > mpc8_thres[res]].bits, 2) + quant_offsets[res - 5];
396
124344
                    c->Q[ch][off + j] = t;
397
124344
                    cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
398
                }
399
3454
                break;
400
365
            default:
401
13505
                for(j = 0; j < SAMPLES_PER_BAND; j++){
402
13140
                    c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
403
13140
                    if(res != 9){
404
5544
                        c->Q[ch][off + j] <<= res - 9;
405
5544
                        c->Q[ch][off + j] |= get_bits(gb, res - 9);
406
                    }
407
13140
                    c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
408
                }
409
            }
410
        }
411
    }
412
413
456
    frame->nb_samples = MPC_FRAME_SIZE;
414
456
    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
415
        return res;
416
417
456
    ff_mpc_dequantize_and_synth(c, maxband - 1,
418
456
                                (int16_t **)frame->extended_data,
419
                                avctx->channels);
420
421
456
    c->cur_frame++;
422
423
456
    c->last_bits_used = get_bits_count(gb);
424
456
    if(c->cur_frame >= c->frames)
425
7
        c->cur_frame = 0;
426
456
    if (get_bits_left(gb) < 0) {
427
        av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
428
        c->last_bits_used = buf_size << 3;
429

456
    } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
430
7
        c->last_bits_used = buf_size << 3;
431
    }
432
433
456
    *got_frame_ptr = 1;
434
435
456
    return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
436
}
437
438
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
439
{
440
    MPCContext *c = avctx->priv_data;
441
    c->cur_frame = 0;
442
}
443
444
AVCodec ff_mpc8_decoder = {
445
    .name           = "mpc8",
446
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV8"),
447
    .type           = AVMEDIA_TYPE_AUDIO,
448
    .id             = AV_CODEC_ID_MUSEPACK8,
449
    .priv_data_size = sizeof(MPCContext),
450
    .init           = mpc8_decode_init,
451
    .decode         = mpc8_decode_frame,
452
    .flush          = mpc8_decode_flush,
453
    .capabilities   = AV_CODEC_CAP_DR1,
454
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
455
                                                      AV_SAMPLE_FMT_NONE },
456
};