GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mpc8.c Lines: 68 239 28.5 %
Date: 2019-11-20 04:07:19 Branches: 7 139 5.0 %

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
static inline int mpc8_dec_base(GetBitContext *gb, int k, int n)
46
{
47
    int len = mpc8_cnk_len[k-1][n-1] - 1;
48
    int code = len ? get_bits_long(gb, len) : 0;
49
50
    if (code >= mpc8_cnk_lost[k-1][n-1])
51
        code = ((code << 1) | get_bits1(gb)) - mpc8_cnk_lost[k-1][n-1];
52
53
    return code;
54
}
55
56
static inline int mpc8_dec_enum(GetBitContext *gb, int k, int n)
57
{
58
    int bits = 0;
59
    const uint32_t * C = mpc8_cnk[k-1];
60
    int code = mpc8_dec_base(gb, k, n);
61
62
    do {
63
        n--;
64
        if (code >= C[n]) {
65
            bits |= 1U << n;
66
            code -= C[n];
67
            C -= 32;
68
            k--;
69
        }
70
    } while(k > 0);
71
72
    return bits;
73
}
74
75
static inline int mpc8_get_mod_golomb(GetBitContext *gb, int m)
76
{
77
    if(mpc8_cnk_len[0][m] < 1) return 0;
78
    return mpc8_dec_base(gb, 1, m+1);
79
}
80
81
static int mpc8_get_mask(GetBitContext *gb, int size, int t)
82
{
83
    int mask = 0;
84
85
    if(t && t != size)
86
         mask = mpc8_dec_enum(gb, FFMIN(t, size - t), size);
87
    if((t << 1) > size) mask = ~mask;
88
89
    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
1
static av_cold int mpc8_decode_init(AVCodecContext * avctx)
97
{
98
    int i;
99
1
    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
1
    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
1
    memset(c->oldDSCF, 0, sizeof(c->oldDSCF));
120
1
    av_lfg_init(&c->rnd, 0xDEADBEEF);
121
1
    ff_mpadsp_init(&c->mpadsp);
122
123
1
    ff_mpc_init();
124
125
1
    init_get_bits(&gb, avctx->extradata, 16);
126
127
1
    skip_bits(&gb, 3);//sample rate
128
1
    c->maxbands = get_bits(&gb, 5) + 1;
129
1
    if (c->maxbands >= BANDS) {
130
        av_log(avctx,AV_LOG_ERROR, "maxbands %d too high\n", c->maxbands);
131
        return AVERROR_INVALIDDATA;
132
    }
133
1
    channels = get_bits(&gb, 4) + 1;
134
1
    if (channels > 2) {
135
        avpriv_request_sample(avctx, "Multichannel MPC SV8");
136
        return AVERROR_PATCHWELCOME;
137
    }
138
1
    c->MSS = get_bits1(&gb);
139
1
    c->frames = 1 << (get_bits(&gb, 3) * 2);
140
141
1
    avctx->sample_fmt = AV_SAMPLE_FMT_S16P;
142
1
    avctx->channel_layout = (channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
143
1
    avctx->channels = channels;
144
145
1
    if(vlc_initialized) return 0;
146
1
    av_log(avctx, AV_LOG_DEBUG, "Initing VLC\n");
147
148
1
    band_vlc.table = band_table;
149
1
    band_vlc.table_allocated = 542;
150
1
    init_vlc(&band_vlc, MPC8_BANDS_BITS, MPC8_BANDS_SIZE,
151
             mpc8_bands_bits,  1, 1,
152
             mpc8_bands_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
153
154
1
    q1_vlc.table = q1_table;
155
1
    q1_vlc.table_allocated = 520;
156
1
    init_vlc(&q1_vlc, MPC8_Q1_BITS, MPC8_Q1_SIZE,
157
             mpc8_q1_bits,  1, 1,
158
             mpc8_q1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
159
1
    q9up_vlc.table = q9up_table;
160
1
    q9up_vlc.table_allocated = 524;
161
1
    init_vlc(&q9up_vlc, MPC8_Q9UP_BITS, MPC8_Q9UP_SIZE,
162
             mpc8_q9up_bits,  1, 1,
163
             mpc8_q9up_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
164
165
1
    scfi_vlc[0].table = scfi0_table;
166
1
    scfi_vlc[0].table_allocated = 1 << MPC8_SCFI0_BITS;
167
1
    init_vlc(&scfi_vlc[0], MPC8_SCFI0_BITS, MPC8_SCFI0_SIZE,
168
             mpc8_scfi0_bits,  1, 1,
169
             mpc8_scfi0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
170
1
    scfi_vlc[1].table = scfi1_table;
171
1
    scfi_vlc[1].table_allocated = 1 << MPC8_SCFI1_BITS;
172
1
    init_vlc(&scfi_vlc[1], MPC8_SCFI1_BITS, MPC8_SCFI1_SIZE,
173
             mpc8_scfi1_bits,  1, 1,
174
             mpc8_scfi1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
175
176
1
    dscf_vlc[0].table = dscf0_table;
177
1
    dscf_vlc[0].table_allocated = 560;
178
1
    init_vlc(&dscf_vlc[0], MPC8_DSCF0_BITS, MPC8_DSCF0_SIZE,
179
             mpc8_dscf0_bits,  1, 1,
180
             mpc8_dscf0_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
181
1
    dscf_vlc[1].table = dscf1_table;
182
1
    dscf_vlc[1].table_allocated = 598;
183
1
    init_vlc(&dscf_vlc[1], MPC8_DSCF1_BITS, MPC8_DSCF1_SIZE,
184
             mpc8_dscf1_bits,  1, 1,
185
             mpc8_dscf1_codes, 1, 1, INIT_VLC_USE_NEW_STATIC);
186
187
1
    q3_vlc[0].table = q3_0_table;
188
1
    q3_vlc[0].table_allocated = 512;
189
1
    ff_init_vlc_sparse(&q3_vlc[0], MPC8_Q3_BITS, MPC8_Q3_SIZE,
190
             mpc8_q3_bits,  1, 1,
191
             mpc8_q3_codes, 1, 1,
192
             mpc8_q3_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
193
1
    q3_vlc[1].table = q3_1_table;
194
1
    q3_vlc[1].table_allocated = 516;
195
1
    ff_init_vlc_sparse(&q3_vlc[1], MPC8_Q4_BITS, MPC8_Q4_SIZE,
196
             mpc8_q4_bits,  1, 1,
197
             mpc8_q4_codes, 1, 1,
198
             mpc8_q4_syms,  1, 1, INIT_VLC_USE_NEW_STATIC);
199
200
3
    for(i = 0; i < 2; i++){
201
2
        res_vlc[i].table = &codes_table[vlc_offsets[0+i]];
202
2
        res_vlc[i].table_allocated = vlc_offsets[1+i] - vlc_offsets[0+i];
203
2
        init_vlc(&res_vlc[i], MPC8_RES_BITS, MPC8_RES_SIZE,
204
                 &mpc8_res_bits[i],  1, 1,
205
                 &mpc8_res_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
206
207
2
        q2_vlc[i].table = &codes_table[vlc_offsets[2+i]];
208
2
        q2_vlc[i].table_allocated = vlc_offsets[3+i] - vlc_offsets[2+i];
209
2
        init_vlc(&q2_vlc[i], MPC8_Q2_BITS, MPC8_Q2_SIZE,
210
                 &mpc8_q2_bits[i],  1, 1,
211
                 &mpc8_q2_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
212
213
2
        quant_vlc[0][i].table = &codes_table[vlc_offsets[4+i]];
214
2
        quant_vlc[0][i].table_allocated = vlc_offsets[5+i] - vlc_offsets[4+i];
215
2
        init_vlc(&quant_vlc[0][i], MPC8_Q5_BITS, MPC8_Q5_SIZE,
216
                 &mpc8_q5_bits[i],  1, 1,
217
                 &mpc8_q5_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
218
2
        quant_vlc[1][i].table = &codes_table[vlc_offsets[6+i]];
219
2
        quant_vlc[1][i].table_allocated = vlc_offsets[7+i] - vlc_offsets[6+i];
220
2
        init_vlc(&quant_vlc[1][i], MPC8_Q6_BITS, MPC8_Q6_SIZE,
221
                 &mpc8_q6_bits[i],  1, 1,
222
                 &mpc8_q6_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
223
2
        quant_vlc[2][i].table = &codes_table[vlc_offsets[8+i]];
224
2
        quant_vlc[2][i].table_allocated = vlc_offsets[9+i] - vlc_offsets[8+i];
225
2
        init_vlc(&quant_vlc[2][i], MPC8_Q7_BITS, MPC8_Q7_SIZE,
226
                 &mpc8_q7_bits[i],  1, 1,
227
                 &mpc8_q7_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
228
2
        quant_vlc[3][i].table = &codes_table[vlc_offsets[10+i]];
229
2
        quant_vlc[3][i].table_allocated = vlc_offsets[11+i] - vlc_offsets[10+i];
230
2
        init_vlc(&quant_vlc[3][i], MPC8_Q8_BITS, MPC8_Q8_SIZE,
231
                 &mpc8_q8_bits[i],  1, 1,
232
                 &mpc8_q8_codes[i], 1, 1, INIT_VLC_USE_NEW_STATIC);
233
    }
234
1
    vlc_initialized = 1;
235
236
1
    return 0;
237
}
238
239
static int mpc8_decode_frame(AVCodecContext * avctx, void *data,
240
                             int *got_frame_ptr, AVPacket *avpkt)
241
{
242
    AVFrame *frame     = data;
243
    const uint8_t *buf = avpkt->data;
244
    int buf_size = avpkt->size;
245
    MPCContext *c = avctx->priv_data;
246
    GetBitContext gb2, *gb = &gb2;
247
    int i, j, k, ch, cnt, res, t;
248
    Band *bands = c->bands;
249
    int off;
250
    int maxband, keyframe;
251
    int last[2];
252
253
    keyframe = c->cur_frame == 0;
254
255
    if(keyframe){
256
        memset(c->Q, 0, sizeof(c->Q));
257
        c->last_bits_used = 0;
258
    }
259
    if ((res = init_get_bits8(gb, buf, buf_size)) < 0)
260
        return res;
261
262
    skip_bits(gb, c->last_bits_used & 7);
263
264
    if(keyframe)
265
        maxband = mpc8_get_mod_golomb(gb, c->maxbands + 1);
266
    else{
267
        maxband = c->last_max_band + get_vlc2(gb, band_vlc.table, MPC8_BANDS_BITS, 2);
268
        if(maxband > 32) maxband -= 33;
269
    }
270
271
    if (get_bits_left(gb) < 0) {
272
        *got_frame_ptr = 0;
273
        return buf_size;
274
    }
275
276
    if(maxband > c->maxbands + 1) {
277
        av_log(avctx, AV_LOG_ERROR, "maxband %d too large\n",maxband);
278
        return AVERROR_INVALIDDATA;
279
    }
280
    c->last_max_band = maxband;
281
282
    /* read subband indexes */
283
    if(maxband){
284
        last[0] = last[1] = 0;
285
        for(i = maxband - 1; i >= 0; i--){
286
            for(ch = 0; ch < 2; ch++){
287
                last[ch] = get_vlc2(gb, res_vlc[last[ch] > 2].table, MPC8_RES_BITS, 2) + last[ch];
288
                if(last[ch] > 15) last[ch] -= 17;
289
                bands[i].res[ch] = last[ch];
290
            }
291
        }
292
        if(c->MSS){
293
            int mask;
294
295
            cnt = 0;
296
            for(i = 0; i < maxband; i++)
297
                if(bands[i].res[0] || bands[i].res[1])
298
                    cnt++;
299
            t = mpc8_get_mod_golomb(gb, cnt);
300
            mask = mpc8_get_mask(gb, cnt, t);
301
            for(i = maxband - 1; i >= 0; i--)
302
                if(bands[i].res[0] || bands[i].res[1]){
303
                    bands[i].msf = mask & 1;
304
                    mask >>= 1;
305
                }
306
        }
307
    }
308
    for(i = maxband; i < c->maxbands; i++)
309
        bands[i].res[0] = bands[i].res[1] = 0;
310
311
    if(keyframe){
312
        for(i = 0; i < 32; i++)
313
            c->oldDSCF[0][i] = c->oldDSCF[1][i] = 1;
314
    }
315
316
    for(i = 0; i < maxband; i++){
317
        if(bands[i].res[0] || bands[i].res[1]){
318
            cnt = !!bands[i].res[0] + !!bands[i].res[1] - 1;
319
            if(cnt >= 0){
320
                t = get_vlc2(gb, scfi_vlc[cnt].table, scfi_vlc[cnt].bits, 1);
321
                if(bands[i].res[0]) bands[i].scfi[0] = t >> (2 * cnt);
322
                if(bands[i].res[1]) bands[i].scfi[1] = t & 3;
323
            }
324
        }
325
    }
326
327
    for(i = 0; i < maxband; i++){
328
        for(ch = 0; ch < 2; ch++){
329
            if(!bands[i].res[ch]) continue;
330
331
            if(c->oldDSCF[ch][i]){
332
                bands[i].scf_idx[ch][0] = get_bits(gb, 7) - 6;
333
                c->oldDSCF[ch][i] = 0;
334
            }else{
335
                t = get_vlc2(gb, dscf_vlc[1].table, MPC8_DSCF1_BITS, 2);
336
                if(t == 64)
337
                    t += get_bits(gb, 6);
338
                bands[i].scf_idx[ch][0] = ((bands[i].scf_idx[ch][2] + t - 25) & 0x7F) - 6;
339
            }
340
            for(j = 0; j < 2; j++){
341
                if((bands[i].scfi[ch] << j) & 2)
342
                    bands[i].scf_idx[ch][j + 1] = bands[i].scf_idx[ch][j];
343
                else{
344
                    t = get_vlc2(gb, dscf_vlc[0].table, MPC8_DSCF0_BITS, 2);
345
                    if(t == 31)
346
                        t = 64 + get_bits(gb, 6);
347
                    bands[i].scf_idx[ch][j + 1] = ((bands[i].scf_idx[ch][j] + t - 25) & 0x7F) - 6;
348
                }
349
            }
350
        }
351
    }
352
353
    for(i = 0, off = 0; i < maxband; i++, off += SAMPLES_PER_BAND){
354
        for(ch = 0; ch < 2; ch++){
355
            res = bands[i].res[ch];
356
            switch(res){
357
            case -1:
358
                for(j = 0; j < SAMPLES_PER_BAND; j++)
359
                    c->Q[ch][off + j] = (av_lfg_get(&c->rnd) & 0x3FC) - 510;
360
                break;
361
            case 0:
362
                break;
363
            case 1:
364
                for(j = 0; j < SAMPLES_PER_BAND; j += SAMPLES_PER_BAND / 2){
365
                    cnt = get_vlc2(gb, q1_vlc.table, MPC8_Q1_BITS, 2);
366
                    t = mpc8_get_mask(gb, 18, cnt);
367
                    for(k = 0; k < SAMPLES_PER_BAND / 2; k++)
368
                        c->Q[ch][off + j + k] = t & (1 << (SAMPLES_PER_BAND / 2 - k - 1))
369
                                                ? (get_bits1(gb) << 1) - 1 : 0;
370
                }
371
                break;
372
            case 2:
373
                cnt = 6;//2*mpc8_thres[res]
374
                for(j = 0; j < SAMPLES_PER_BAND; j += 3){
375
                    t = get_vlc2(gb, q2_vlc[cnt > 3].table, MPC8_Q2_BITS, 2);
376
                    c->Q[ch][off + j + 0] = mpc8_idx50[t];
377
                    c->Q[ch][off + j + 1] = mpc8_idx51[t];
378
                    c->Q[ch][off + j + 2] = mpc8_idx52[t];
379
                    cnt = (cnt >> 1) + mpc8_huffq2[t];
380
                }
381
                break;
382
            case 3:
383
            case 4:
384
                for(j = 0; j < SAMPLES_PER_BAND; j += 2){
385
                    t = get_vlc2(gb, q3_vlc[res - 3].table, MPC8_Q3_BITS, 2) + q3_offsets[res - 3];
386
                    c->Q[ch][off + j + 1] = t >> 4;
387
                    c->Q[ch][off + j + 0] = (t & 8) ? (t & 0xF) - 16 : (t & 0xF);
388
                }
389
                break;
390
            case 5:
391
            case 6:
392
            case 7:
393
            case 8:
394
                cnt = 2 * mpc8_thres[res];
395
                for(j = 0; j < SAMPLES_PER_BAND; j++){
396
                    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];
397
                    c->Q[ch][off + j] = t;
398
                    cnt = (cnt >> 1) + FFABS(c->Q[ch][off + j]);
399
                }
400
                break;
401
            default:
402
                for(j = 0; j < SAMPLES_PER_BAND; j++){
403
                    c->Q[ch][off + j] = get_vlc2(gb, q9up_vlc.table, MPC8_Q9UP_BITS, 2);
404
                    if(res != 9){
405
                        c->Q[ch][off + j] <<= res - 9;
406
                        c->Q[ch][off + j] |= get_bits(gb, res - 9);
407
                    }
408
                    c->Q[ch][off + j] -= (1 << (res - 2)) - 1;
409
                }
410
            }
411
        }
412
    }
413
414
    frame->nb_samples = MPC_FRAME_SIZE;
415
    if ((res = ff_get_buffer(avctx, frame, 0)) < 0)
416
        return res;
417
418
    ff_mpc_dequantize_and_synth(c, maxband - 1,
419
                                (int16_t **)frame->extended_data,
420
                                avctx->channels);
421
422
    c->cur_frame++;
423
424
    c->last_bits_used = get_bits_count(gb);
425
    if(c->cur_frame >= c->frames)
426
        c->cur_frame = 0;
427
    if (get_bits_left(gb) < 0) {
428
        av_log(avctx, AV_LOG_ERROR, "Overread %d\n", -get_bits_left(gb));
429
        c->last_bits_used = buf_size << 3;
430
    } else if (c->cur_frame == 0 && get_bits_left(gb) < 8) {// we have only padding left
431
        c->last_bits_used = buf_size << 3;
432
    }
433
434
    *got_frame_ptr = 1;
435
436
    return c->cur_frame ? c->last_bits_used >> 3 : buf_size;
437
}
438
439
static av_cold void mpc8_decode_flush(AVCodecContext *avctx)
440
{
441
    MPCContext *c = avctx->priv_data;
442
    c->cur_frame = 0;
443
}
444
445
AVCodec ff_mpc8_decoder = {
446
    .name           = "mpc8",
447
    .long_name      = NULL_IF_CONFIG_SMALL("Musepack SV8"),
448
    .type           = AVMEDIA_TYPE_AUDIO,
449
    .id             = AV_CODEC_ID_MUSEPACK8,
450
    .priv_data_size = sizeof(MPCContext),
451
    .init           = mpc8_decode_init,
452
    .decode         = mpc8_decode_frame,
453
    .flush          = mpc8_decode_flush,
454
    .capabilities   = AV_CODEC_CAP_DR1,
455
    .sample_fmts    = (const enum AVSampleFormat[]) { AV_SAMPLE_FMT_S16P,
456
                                                      AV_SAMPLE_FMT_NONE },
457
};