GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc8.c Lines: 202 221 91.4 %
Date: 2021-04-20 04:37:23 Branches: 122 141 86.5 %

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 "libavutil/thread.h"
31
#include "avcodec.h"
32
#include "get_bits.h"
33
#include "internal.h"
34
#include "mpegaudiodsp.h"
35
36
#include "mpc.h"
37
#include "mpc8data.h"
38
#include "mpc8huff.h"
39
40
static VLC band_vlc, scfi_vlc[2], dscf_vlc[2], res_vlc[2];
41
static VLC q1_vlc, q2_vlc[2], q3_vlc[2], quant_vlc[4][2], q9up_vlc;
42
43
7797
static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
44
{
45
7797
    int len = mpc8_cnk_len[k-1][n-1] - 1;
46
7797
    int code = len ? get_bits_long(gb, len) : 0;
47
48
7797
    if (code >= mpc8_cnk_lost[k-1][n-1])
49
3746
        code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
50
51
7797
    return code;
52
}
53
54
7335
static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
55
{
56
7335
    int bits = 0;
57
7335
    const uint32_t * C = mpc8_cnk[k-1];
58
7335
    int code = mpc8_dec_base(gb, k, n);
59
60
    do {
61
109711
        n--;
62
109711
        if (code >= C[n]) {
63
41077
            bits |= 1U << n;
64
41077
            code -= C[n];
65
41077
            C -= 32;
66
41077
            k--;
67
        }
68
109711
    } while(k > 0);
69
70
7335
    return bits;
71
}
72
73
462
static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
74
{
75
462
    if(mpc8_cnk_len[0][m] < 1) return 0;
76
462
    return mpc8_dec_base(gb, 1, m+1);
77
}
78
79
7492
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
80
{
81
7492
    int mask = 0;
82
83

7492
    if(t && t != size)
84
7335
         mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
85
7492
    if((t << 1) > size) mask = ~mask;
86
87
7492
    return mask;
88
}
89
90
42
static av_cold void build_vlc(VLC *vlc, unsigned *buf_offset,
91
                              const uint8_t codes_counts[16],
92
                              const uint8_t **syms, int offset)
93
{
94
    static VLC_TYPE vlc_buf[9296][2];
95
    uint8_t len[MPC8_MAX_VLC_SIZE];
96
42
    unsigned num = 0;
97
98
42
    vlc->table           = &vlc_buf[*buf_offset];
99
42
    vlc->table_allocated = FF_ARRAY_ELEMS(vlc_buf) - *buf_offset;
100
101
714
    for (int i = 16; i > 0; i--)
102
3358
        for (unsigned tmp = num + codes_counts[i - 1]; num < tmp; num++)
103
2686
            len[num] = i;
104
105
42
    ff_init_vlc_from_lengths(vlc, FFMIN(len[0], 9), num, len, 1,
106
                             *syms, 1, 1, offset, INIT_VLC_STATIC_OVERLONG, NULL);
107
42
    *buf_offset += vlc->table_size;
108
42
    *syms       += num;
109
42
}
110
111
2
static av_cold void mpc8_init_static(void)
112
{
113
2
    const uint8_t *q_syms   = mpc8_q_syms,  *bands_syms = mpc8_bands_syms;
114
2
    const uint8_t *res_syms = mpc8_res_syms, *scfi_syms = mpc8_scfi_syms;
115
2
    const uint8_t *dscf_syms = mpc8_dscf_syms;
116
2
    unsigned offset = 0;
117
118
2
    build_vlc(&band_vlc, &offset, mpc8_bands_len_counts, &bands_syms, 0);
119
120
2
    build_vlc(&q1_vlc,   &offset, mpc8_q1_len_counts,   &q_syms, 0);
121
2
    build_vlc(&q9up_vlc, &offset, mpc8_q9up_len_counts, &q_syms, 0);
122
123
6
    for (int i = 0; i < 2; i++){
124
4
        build_vlc(&scfi_vlc[i], &offset, mpc8_scfi_len_counts[i], &scfi_syms, 0);
125
126
4
        build_vlc(&dscf_vlc[i], &offset, mpc8_dscf_len_counts[i], &dscf_syms, 0);
127
128
4
        build_vlc(&res_vlc[i],  &offset, mpc8_res_len_counts[i],  &res_syms,  0);
129
130
4
        build_vlc(&q2_vlc[i], &offset, mpc8_q2_len_counts[i], &q_syms, 0);
131
4
        build_vlc(&q3_vlc[i], &offset, mpc8_q34_len_counts[i],
132
4
                  &q_syms, -48 - 16 * i);
133
20
        for (int j = 0; j < 4; j++)
134
16
            build_vlc(&quant_vlc[j][i], &offset, mpc8_q5_8_len_counts[i][j],
135
16
                      &q_syms, -((8 << j) - 1));
136
    }
137
2
    ff_mpa_synth_init_fixed();
138
2
}
139
140
3
static av_cold int mpc8_decode_init(AVCodecContext * avctx)
141
{
142
    static AVOnce init_static_once = AV_ONCE_INIT;
143
3
    MPCContext *c = avctx->priv_data;
144
    GetBitContext gb;
145
    int channels;
146
147
3
    if(avctx->extradata_size < 2){
148
        av_log(avctx, AV_LOG_ERROR, "Too small extradata size (%i)!\n", avctx->extradata_size);
149
        return -1;
150
    }
151
3
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
152
3
    av_lfg_init(&c->rnd, 0xDEADBEEF);
153
3
    ff_mpadsp_init(&c->mpadsp);
154
155
3
    init_get_bits(&gb, avctx->extradata, 16);
156
157
3
    skip_bits(&gb, 3);//sample rate
158
3
    c->maxbands = get_bits(&gb, 5) + 1;
159
3
    if (c->maxbands >= BANDS) {
160
        av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
161
        return AVERROR_INVALIDDATA;
162
    }
163
3
    channels = get_bits(&gb, 4) + 1;
164
3
    if (channels > 2) {
165
        avpriv_request_sample(avctx, "Multichannel MPC SV8");
166
        return AVERROR_PATCHWELCOME;
167
    }
168
3
    c->MSS = get_bits1(&gb);
169
3
    c->frames = 1 << (get_bits(&gb, 3) * 2);
170
171
3
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
172
3
    avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
173
3
    avctx->channels = channels;
174
175
3
    ff_thread_once(&init_static_once, mpc8_init_static);
176
177
3
    return 0;
178
}
179
180
459
static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
181
                             int *got_frame_ptr, AVPacket *avpkt)
182
{
183
459
    AVFrame *frame     = data;
184
459
    const uint8_t *buf = avpkt->data;
185
459
    int buf_size = avpkt->size;
186
459
    MPCContext *c = avctx->priv_data;
187
459
    GetBitContext gb2, *gb = &gb2;
188
    int i, j, k, ch, cnt, res, t;
189
459
    Band *bands = c->bands;
190
    int off;
191
    int maxband, keyframe;
192
    int last[2];
193
194
459
    keyframe = c->cur_frame == 0;
195
196
459
    if(keyframe){
197
10
        memset(c->Q, 0, sizeof(c->Q));
198
10
        c->last_bits_used = 0;
199
    }
200
459
    if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
201
        return res;
202
203
459
    skip_bits(gb, c->last_bits_used & 7);
204
205
459
    if(keyframe)
206
10
        maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
207
    else{
208
449
        maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
209
449
        if(maxband > 32) maxband -= 33;
210
    }
211
212
459
    if (get_bits_left(gb) < 0) {
213
1
        *got_frame_ptr = 0;
214
1
        return buf_size;
215
    }
216
217
458
    if(maxband > c->maxbands + 1) {
218
        av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
219
        return AVERROR_INVALIDDATA;
220
    }
221
458
    c->last_max_band = maxband;
222
223
    /* read subband indexes */
224
458
    if(maxband){
225
452
        last[0] = last[1] = 0;
226
10866
        for(i = maxband - 1; i >= 0; i--){
227
31242
            for(ch = 0; ch < 2; ch++){
228
20828
                last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
229
20828
                if(last[ch] > 15) last[ch] -= 17;
230
20828
                bands[i].res[ch] = last[ch];
231
            }
232
        }
233
452
        if(c->MSS){
234
            int mask;
235
236
452
            cnt = 0;
237
10866
            for(i = 0; i < maxband; i++)
238

10414
                if(bands[i].res[0] || bands[i].res[1])
239
10414
                    cnt++;
240
452
            t = mpc8_get_mod_golomb(gb, cnt);
241
452
            mask = mpc8_get_mask(gb, cnt, t);
242
10866
            for(i = maxband - 1; i >= 0; i--)
243

10414
                if(bands[i].res[0] || bands[i].res[1]){
244
10414
                    bands[i].msf = mask & 1;
245
10414
                    mask >>= 1;
246
                }
247
        }
248
    }
249
2868
    for(i = maxband; i < c->maxbands; i++)
250
2410
        bands[i].res[0] = bands[i].res[1] = 0;
251
252
458
    if(keyframe){
253
330
        for(i = 0; i < 32; i++)
254
320
            c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
255
    }
256
257
10872
    for(i = 0; i < maxband; i++){
258

10414
        if(bands[i].res[0] || bands[i].res[1]){
259
10414
            cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
260
10414
            if(cnt >= 0){
261
10414
                t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
262
10414
                if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
263
10414
                if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
264
            }
265
        }
266
    }
267
268
10872
    for(i = 0; i < maxband; i++){
269
31242
        for(ch = 0; ch < 2; ch++){
270
20828
            if(!bands[i].res[ch]) continue;
271
272
18282
            if(c->oldDSCF[ch][i]){
273
388
                bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
274
388
                c->oldDSCF[ch][i] = 0;
275
            }else{
276
17894
                t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
277
17894
                if(t == 64)
278
50
                    t += get_bits(gb, 6);
279
17894
                bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
280
            }
281
54846
            for(j = 0; j < 2; j++){
282
36564
                if((bands[i].scfi[ch] << j) & 2)
283
23434
                    bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
284
                else{
285
13130
                    t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
286
13130
                    if(t == 31)
287
98
                        t = 64 + get_bits(gb, 6);
288
13130
                    bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
289
                }
290
            }
291
        }
292
    }
293
294
10872
    for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
295
31242
        for(ch = 0; ch < 2; ch++){
296
20828
            res = bands[i].res[ch];
297

20828
            switch(res){
298
            case -1:
299
                for(j = 0; j < SAMPLES_PER_BAND; j++)
300
                    c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
301
                break;
302
2546
            case 0:
303
2546
                break;
304
3520
            case 1:
305
10560
                for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
306
7040
                    cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
307
7040
                    t = mpc8_get_mask(gb, 18, cnt);
308
133760
                    for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
309
126720
                        c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
310
126720
                                                ? (get_bits1(gb) << 1) - 1 : 0;
311
                }
312
3520
                break;
313
6121
            case 2:
314
6121
                cnt = 6;//2*mpc8_thres[res]
315
79573
                for(j = 0; j < SAMPLES_PER_BAND; j += 3){
316
73452
                    t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
317
73452
                    c->Q[ch][off + j + 0] = mpc8_idx50[t];
318
73452
                    c->Q[ch][off + j + 1] = mpc8_idx51[t];
319
73452
                    c->Q[ch][off + j + 2] = mpc8_idx52[t];
320
73452
                    cnt = (cnt >> 1) + mpc8_huffq2[t];
321
                }
322
6121
                break;
323
4822
            case 3:
324
            case 4:
325
91618
                for(j = 0; j < SAMPLES_PER_BAND; j += 2){
326
86796
                    t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2);
327
86796
                    c->Q[ch][off + j + 1] = t >> 4;
328
86796
                    c->Q[ch][off + j + 0] = sign_extend(t, 4);
329
                }
330
4822
                break;
331
3454
            case 5:
332
            case 6:
333
            case 7:
334
            case 8:
335
3454
                cnt = 2 * mpc8_thres[res];
336
127798
                for(j = 0; j < SAMPLES_PER_BAND; j++){
337
124344
                    const VLC *vlc = &quant_vlc[res - 5][cnt > mpc8_thres[res]];
338
124344
                    c->Q[ch][off + j] = get_vlc2(gb, vlc->table, vlc->bits, 2);
339
124344
                    cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
340
                }
341
3454
                break;
342
365
            default:
343
13505
                for(j = 0; j < SAMPLES_PER_BAND; j++){
344
13140
                    c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
345
13140
                    if(res != 9){
346
5544
                        c->Q[ch][off + j] <<= res - 9;
347
5544
                        c->Q[ch][off + j] |= get_bits(gb, res - 9);
348
                    }
349
13140
                    c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
350
                }
351
            }
352
        }
353
    }
354
355
458
    frame->nb_samples = MPC_FRAME_SIZE;
356
458
    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
357
        return res;
358
359
458
    ff_mpc_dequantize_and_synth(c, maxband - 1,
360
458
                                (int16_t **)frame->extended_data,
361
                                avctx->channels);
362
363
458
    c->cur_frame++;
364
365
458
    c->last_bits_used = get_bits_count(gb);
366
458
    if(c->cur_frame >= c->frames)
367
7
        c->cur_frame = 0;
368
458
    if (get_bits_left(gb) < 0) {
369
        av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
370
        c->last_bits_used = buf_size << 3;
371

458
    } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
372
7
        c->last_bits_used = buf_size << 3;
373
    }
374
375
458
    *got_frame_ptr = 1;
376
377
458
    return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
378
}
379
380
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
381
{
382
    MPCContext *c = avctx->priv_data;
383
    c->cur_frame = 0;
384
}
385
386
AVCodec ff_mpc8_decoder = {
387
    .name           = "mpc8",
388
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV8"),
389
    .type           = AVMEDIA_TYPE_AUDIO,
390
    .id             = AV_CODEC_ID_MUSEPACK8,
391
    .priv_data_size = sizeof(MPCContext),
392
    .init           = mpc8_decode_init,
393
    .decode         = mpc8_decode_frame,
394
    .flush          = mpc8_decode_flush,
395
    .capabilities   = AV_CODEC_CAP_DR1 | AV_CODEC_CAP_CHANNEL_CONF,
396
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
397
                                                      AV_SAMPLE_FMT_NONE },
398
    .caps_internal  = FF_CODEC_CAP_INIT_THREADSAFE,
399
};