GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/mv30.c Lines: 0 401 0.0 %
Date: 2021-04-20 15:25:36 Branches: 0 142 0.0 %

Line Branch Exec Source
1
/*
2
 * MidiVid MV30 decoder
3
 *
4
 * Copyright (c) 2020 Paul B Mahol
5
 *
6
 * This file is part of FFmpeg.
7
 *
8
 * FFmpeg is free software; you can redistribute it and/or
9
 * modify it under the terms of the GNU Lesser General Public
10
 * License as published by the Free Software Foundation; either
11
 * version 2.1 of the License, or (at your option) any later version.
12
 *
13
 * FFmpeg is distributed in the hope that it will be useful,
14
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
16
 * Lesser General Public License for more details.
17
 *
18
 * You should have received a copy of the GNU Lesser General Public
19
 * License along with FFmpeg; if not, write to the Free Software
20
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21
 */
22
23
#include <stdio.h>
24
#include <stdlib.h>
25
#include <string.h>
26
27
#include "libavutil/thread.h"
28
29
#include "avcodec.h"
30
#include "bytestream.h"
31
#include "copy_block.h"
32
#include "mathops.h"
33
#include "blockdsp.h"
34
#include "get_bits.h"
35
#include "internal.h"
36
#include "aandcttab.h"
37
38
#define CBP_VLC_BITS  9
39
40
typedef struct MV30Context {
41
    GetBitContext  gb;
42
43
    int intra_quant;
44
    int inter_quant;
45
    int is_inter;
46
    int mode_size;
47
    int nb_mvectors;
48
49
    int      block[6][64];
50
    int16_t *mvectors;
51
    unsigned int mvectors_size;
52
    int16_t *coeffs;
53
    unsigned int coeffs_size;
54
55
    int16_t intraq_tab[2][64];
56
    int16_t interq_tab[2][64];
57
58
    BlockDSPContext bdsp;
59
    AVFrame *prev_frame;
60
} MV30Context;
61
62
static VLC cbp_tab;
63
64
static const uint8_t luma_tab[] = {
65
    12, 12, 15, 19, 25, 34, 40, 48,
66
    12, 12, 18, 22, 27, 44, 47, 46,
67
    17, 18, 21, 26, 35, 46, 52, 47,
68
    18, 20, 24, 28, 40, 61, 59, 51,
69
    20, 24, 32, 43, 50, 72, 72, 63,
70
    25, 31, 42, 48, 58, 72, 81, 75,
71
    38, 46, 54, 61, 71, 84, 88, 85,
72
    50, 61, 65, 68, 79, 78, 86, 91,
73
};
74
75
static const uint8_t chroma_tab[] = {
76
    12, 16, 24, 47, 99, 99, 99, 99,
77
    16, 21, 26, 66, 99, 99, 99, 99,
78
    24, 26, 56, 99, 99, 99, 99, 99,
79
    47, 66, 99, 99, 99, 99, 99, 99,
80
    99, 99, 99, 99, 99, 99, 99, 99,
81
    99, 99, 99, 99, 99, 99, 99, 99,
82
    99, 99, 99, 99, 99, 99, 99, 99,
83
    99, 99, 99, 99, 99, 99, 99, 99,
84
};
85
86
static const uint8_t zigzag[] = {
87
     0,  1,  8,  9, 16,  2,  3, 10,
88
    17, 24, 32, 25, 18, 11,  4,  5,
89
    12, 19, 26, 33, 40, 48, 41, 34,
90
    27, 20, 13,  6,  7, 14, 21, 28,
91
    35, 42, 49, 56, 57, 50, 43, 36,
92
    29, 22, 15, 23, 30, 37, 44, 51,
93
    58, 59, 52, 45, 38, 31, 39, 46,
94
    53, 60, 61, 54, 47, 55, 62, 63,
95
};
96
97
static void get_qtable(int16_t *table, int quant, const uint8_t *quant_tab)
98
{
99
    int factor = quant < 50 ? 5000 / FFMAX(quant, 1) : 200 - FFMIN(quant, 100) * 2;
100
101
    for (int i = 0; i < 64; i++) {
102
        table[i] = av_clip((quant_tab[i] * factor + 0x32) / 100, 1, 0x7fff);
103
        table[i] = ((int)ff_aanscales[i] * (int)table[i] + 0x800) >> 12;
104
    }
105
}
106
107
static inline void idct_1d(unsigned *blk, int step)
108
{
109
    const unsigned t0 = blk[0 * step] + blk[4 * step];
110
    const unsigned t1 = blk[0 * step] - blk[4 * step];
111
    const unsigned t2 = blk[2 * step] + blk[6 * step];
112
    const unsigned t3 = ((int)((blk[2 * step] - blk[6 * step]) * 362U) >> 8) - t2;
113
    const unsigned t4 = t0 + t2;
114
    const unsigned t5 = t0 - t2;
115
    const unsigned t6 = t1 + t3;
116
    const unsigned t7 = t1 - t3;
117
    const unsigned t8 = blk[5 * step] + blk[3 * step];
118
    const unsigned t9 = blk[5 * step] - blk[3 * step];
119
    const unsigned tA = blk[1 * step] + blk[7 * step];
120
    const unsigned tB = blk[1 * step] - blk[7 * step];
121
    const unsigned tC = t8 + tA;
122
    const unsigned tD = (int)((tB + t9) * 473U) >> 8;
123
    const unsigned tE = (((int)(t9 * -669U) >> 8) - tC) + tD;
124
    const unsigned tF = ((int)((tA - t8) * 362U) >> 8) - tE;
125
    const unsigned t10 = (((int)(tB * 277U) >> 8) - tD) + tF;
126
127
    blk[0 * step] = t4 + tC;
128
    blk[1 * step] = t6 + tE;
129
    blk[2 * step] = t7 + tF;
130
    blk[3 * step] = t5 - t10;
131
    blk[4 * step] = t5 + t10;
132
    blk[5 * step] = t7 - tF;
133
    blk[6 * step] = t6 - tE;
134
    blk[7 * step] = t4 - tC;
135
}
136
137
static void idct_put(uint8_t *dst, int stride, int *block)
138
{
139
    for (int i = 0; i < 8; i++) {
140
        if ((block[0x08 + i] |
141
             block[0x10 + i] |
142
             block[0x18 + i] |
143
             block[0x20 + i] |
144
             block[0x28 + i] |
145
             block[0x30 + i] |
146
             block[0x38 + i]) == 0) {
147
            block[0x08 + i] = block[i];
148
            block[0x10 + i] = block[i];
149
            block[0x18 + i] = block[i];
150
            block[0x20 + i] = block[i];
151
            block[0x28 + i] = block[i];
152
            block[0x30 + i] = block[i];
153
            block[0x38 + i] = block[i];
154
        } else {
155
            idct_1d(block + i, 8);
156
        }
157
    }
158
159
    for (int i = 0; i < 8; i++) {
160
        idct_1d(block, 1);
161
        for (int j = 0; j < 8; j++)
162
            dst[j] = av_clip_uint8((block[j] >> 5) + 128);
163
        block += 8;
164
        dst += stride;
165
    }
166
}
167
168
static void idct_add(uint8_t *dst, int stride,
169
                     const uint8_t *src, int in_linesize, int *block)
170
{
171
    for (int i = 0; i < 8; i++) {
172
        if ((block[0x08 + i] |
173
             block[0x10 + i] |
174
             block[0x18 + i] |
175
             block[0x20 + i] |
176
             block[0x28 + i] |
177
             block[0x30 + i] |
178
             block[0x38 + i]) == 0) {
179
            block[0x08 + i] = block[i];
180
            block[0x10 + i] = block[i];
181
            block[0x18 + i] = block[i];
182
            block[0x20 + i] = block[i];
183
            block[0x28 + i] = block[i];
184
            block[0x30 + i] = block[i];
185
            block[0x38 + i] = block[i];
186
        } else {
187
            idct_1d(block + i, 8);
188
        }
189
    }
190
191
    for (int i = 0; i < 8; i++) {
192
        idct_1d(block, 1);
193
        for (int j = 0; j < 8; j++)
194
            dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
195
        block += 8;
196
        dst += stride;
197
        src += in_linesize;
198
    }
199
}
200
201
static inline void idct2_1d(int *blk, int step)
202
{
203
    const unsigned int  t0 = blk[0 * step];
204
    const unsigned int t1 = blk[1 * step];
205
    const unsigned int t2 = (int)(t1 * 473U) >> 8;
206
    const unsigned int t3 = t2 - t1;
207
    const unsigned int t4 =  ((int)(t1 * 362U) >> 8) - t3;
208
    const unsigned int t5 = (((int)(t1 * 277U) >> 8) - t2) + t4;
209
210
    blk[0 * step] = t1 + t0;
211
    blk[1 * step] = t0 + t3;
212
    blk[2 * step] = t4 + t0;
213
    blk[3 * step] = t0 - t5;
214
    blk[4 * step] = t5 + t0;
215
    blk[5 * step] = t0 - t4;
216
    blk[6 * step] = t0 - t3;
217
    blk[7 * step] = t0 - t1;
218
}
219
220
static void idct2_put(uint8_t *dst, int stride, int *block)
221
{
222
    for (int i = 0; i < 2; i++) {
223
        if ((block[0x08 + i]) == 0) {
224
            block[0x08 + i] = block[i];
225
            block[0x10 + i] = block[i];
226
            block[0x18 + i] = block[i];
227
            block[0x20 + i] = block[i];
228
            block[0x28 + i] = block[i];
229
            block[0x30 + i] = block[i];
230
            block[0x38 + i] = block[i];
231
        } else {
232
            idct2_1d(block + i, 8);
233
        }
234
    }
235
236
    for (int i = 0; i < 8; i++) {
237
        if (block[1] == 0) {
238
            for (int j = 0; j < 8; j++)
239
                dst[j] = av_clip_uint8((block[0] >> 5) + 128);
240
        } else {
241
            idct2_1d(block, 1);
242
            for (int j = 0; j < 8; j++)
243
                dst[j] = av_clip_uint8((block[j] >> 5) + 128);
244
        }
245
        block += 8;
246
        dst += stride;
247
    }
248
}
249
250
static void idct2_add(uint8_t *dst, int stride,
251
                      const uint8_t *src, int in_linesize,
252
                      int *block)
253
{
254
    for (int i = 0; i < 2; i++) {
255
        if ((block[0x08 + i]) == 0) {
256
            block[0x08 + i] = block[i];
257
            block[0x10 + i] = block[i];
258
            block[0x18 + i] = block[i];
259
            block[0x20 + i] = block[i];
260
            block[0x28 + i] = block[i];
261
            block[0x30 + i] = block[i];
262
            block[0x38 + i] = block[i];
263
        } else {
264
            idct2_1d(block + i, 8);
265
        }
266
    }
267
268
    for (int i = 0; i < 8; i++) {
269
        if (block[1] == 0) {
270
            for (int j = 0; j < 8; j++)
271
                dst[j] = av_clip_uint8((block[0] >> 5) + src[j]);
272
        } else {
273
            idct2_1d(block, 1);
274
            for (int j = 0; j < 8; j++)
275
                dst[j] = av_clip_uint8((block[j] >> 5) + src[j]);
276
        }
277
        block += 8;
278
        dst += stride;
279
        src += in_linesize;
280
    }
281
}
282
283
static void update_inter_block(uint8_t *dst, int stride,
284
                               const uint8_t *src, int in_linesize,
285
                               int block)
286
{
287
    for (int i = 0; i < 8; i++) {
288
        for (int j = 0; j < 8; j++)
289
            dst[j] = av_clip_uint8(block + src[j]);
290
        dst += stride;
291
        src += in_linesize;
292
    }
293
}
294
295
static int decode_intra_block(AVCodecContext *avctx, int mode,
296
                              GetByteContext *gbyte, int16_t *qtab,
297
                              int *block, int *pfill,
298
                              uint8_t *dst, int linesize)
299
{
300
    MV30Context *s = avctx->priv_data;
301
    int fill;
302
303
    switch (mode) {
304
    case 0:
305
        s->bdsp.fill_block_tab[1](dst, 128, linesize, 8);
306
        break;
307
    case 1:
308
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
309
        pfill[0] += fill;
310
        block[0] = ((int)((unsigned)pfill[0] * qtab[0]) >> 5) + 128;
311
        s->bdsp.fill_block_tab[1](dst, block[0], linesize, 8);
312
        break;
313
    case 2:
314
        memset(block, 0, sizeof(*block) * 64);
315
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
316
        pfill[0] += fill;
317
        block[0] = (unsigned)pfill[0] * qtab[0];
318
        block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
319
        block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
320
        block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
321
        idct2_put(dst, linesize, block);
322
        break;
323
    case 3:
324
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
325
        pfill[0] += fill;
326
        block[0] = (unsigned)pfill[0] * qtab[0];
327
        for (int i = 1; i < 64; i++)
328
            block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
329
        idct_put(dst, linesize, block);
330
        break;
331
    }
332
333
    return 0;
334
}
335
336
static int decode_inter_block(AVCodecContext *avctx, int mode,
337
                              GetByteContext *gbyte, int16_t *qtab,
338
                              int *block, int *pfill,
339
                              uint8_t *dst, int linesize,
340
                              const uint8_t *src, int in_linesize)
341
{
342
    int fill;
343
344
    switch (mode) {
345
    case 0:
346
        copy_block8(dst, src, linesize, in_linesize, 8);
347
        break;
348
    case 1:
349
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
350
        pfill[0] += fill;
351
        block[0] = (int)((unsigned)pfill[0] * qtab[0]) >> 5;
352
        update_inter_block(dst, linesize, src, in_linesize, block[0]);
353
        break;
354
    case 2:
355
        memset(block, 0, sizeof(*block) * 64);
356
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
357
        pfill[0] += fill;
358
        block[0] = (unsigned)pfill[0] * qtab[0];
359
        block[1] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[1];
360
        block[8] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[8];
361
        block[9] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[9];
362
        idct2_add(dst, linesize, src, in_linesize, block);
363
        break;
364
    case 3:
365
        fill = sign_extend(bytestream2_get_ne16(gbyte), 16);
366
        pfill[0] += fill;
367
        block[0] = (unsigned)pfill[0] * qtab[0];
368
        for (int i = 1; i < 64; i++)
369
            block[zigzag[i]] = sign_extend(bytestream2_get_ne16(gbyte), 16) * qtab[zigzag[i]];
370
        idct_add(dst, linesize, src, in_linesize, block);
371
        break;
372
    }
373
374
    return 0;
375
}
376
377
static int decode_coeffs(GetBitContext *gb, int16_t *coeffs, int nb_codes)
378
{
379
    memset(coeffs, 0, nb_codes * sizeof(*coeffs));
380
381
    for (int i = 0; i < nb_codes;) {
382
        int value = get_vlc2(gb, cbp_tab.table, CBP_VLC_BITS, 1);
383
384
        if (value > 0) {
385
            int x = get_bits(gb, value);
386
387
            if (x < (1 << value) / 2) {
388
                x =  (1 << (value - 1)) + (x & ((1 << value) - 1 >> 1));
389
            } else {
390
                x = -(1 << (value - 1)) - (x & ((1 << value) - 1 >> 1));
391
            }
392
            coeffs[i++] = x;
393
        } else {
394
            int flag = get_bits1(gb);
395
396
            i += get_bits(gb, 3 + flag * 3) + 1 + flag * 8;
397
        }
398
    }
399
400
    return 0;
401
}
402
403
static int decode_intra(AVCodecContext *avctx, GetBitContext *gb, AVFrame *frame)
404
{
405
    MV30Context *s = avctx->priv_data;
406
    GetBitContext mgb;
407
    uint8_t *dst[6];
408
    int linesize[6];
409
    int ret;
410
411
    mgb = *gb;
412
    if (get_bits_left(gb) < s->mode_size * 8)
413
        return AVERROR_INVALIDDATA;
414
415
    skip_bits_long(gb, s->mode_size * 8);
416
417
    linesize[0] = frame->linesize[0];
418
    linesize[1] = frame->linesize[0];
419
    linesize[2] = frame->linesize[0];
420
    linesize[3] = frame->linesize[0];
421
    linesize[4] = frame->linesize[1];
422
    linesize[5] = frame->linesize[2];
423
424
    for (int y = 0; y < avctx->height; y += 16) {
425
        GetByteContext gbyte;
426
        int pfill[3][1] = { {0} };
427
        int nb_codes = get_bits(gb, 16);
428
429
        av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
430
        if (!s->coeffs)
431
            return AVERROR(ENOMEM);
432
        ret = decode_coeffs(gb, s->coeffs, nb_codes);
433
        if (ret < 0)
434
            return ret;
435
436
        bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
437
438
        for (int x = 0; x < avctx->width; x += 16) {
439
            dst[0] = frame->data[0] + linesize[0] * y + x;
440
            dst[1] = frame->data[0] + linesize[0] * y + x + 8;
441
            dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
442
            dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
443
            dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
444
            dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
445
446
            for (int b = 0; b < 6; b++) {
447
                int mode = get_bits_le(&mgb, 2);
448
449
                ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
450
                                         s->block[b],
451
                                         pfill[(b >= 4) + (b >= 5)],
452
                                         dst[b], linesize[b]);
453
                if (ret < 0)
454
                    return ret;
455
            }
456
        }
457
    }
458
459
    return 0;
460
}
461
462
static int decode_inter(AVCodecContext *avctx, GetBitContext *gb,
463
                        AVFrame *frame, AVFrame *prev)
464
{
465
    MV30Context *s = avctx->priv_data;
466
    GetBitContext mask;
467
    GetBitContext mgb;
468
    GetByteContext mv;
469
    const int mask_size = ((avctx->height >> 4) * (avctx->width >> 4) * 2 + 7) / 8;
470
    uint8_t *dst[6], *src[6];
471
    int in_linesize[6];
472
    int linesize[6];
473
    int ret, cnt = 0;
474
    int flags = 0;
475
476
    in_linesize[0] = prev->linesize[0];
477
    in_linesize[1] = prev->linesize[0];
478
    in_linesize[2] = prev->linesize[0];
479
    in_linesize[3] = prev->linesize[0];
480
    in_linesize[4] = prev->linesize[1];
481
    in_linesize[5] = prev->linesize[2];
482
483
    linesize[0] = frame->linesize[0];
484
    linesize[1] = frame->linesize[0];
485
    linesize[2] = frame->linesize[0];
486
    linesize[3] = frame->linesize[0];
487
    linesize[4] = frame->linesize[1];
488
    linesize[5] = frame->linesize[2];
489
490
    av_fast_padded_malloc(&s->mvectors, &s->mvectors_size, 2 * s->nb_mvectors * sizeof(*s->mvectors));
491
    if (!s->mvectors) {
492
        ret = AVERROR(ENOMEM);
493
        goto fail;
494
    }
495
496
    mask = *gb;
497
    skip_bits_long(gb, mask_size * 8);
498
    mgb = *gb;
499
    skip_bits_long(gb, s->mode_size * 8);
500
501
    ret = decode_coeffs(gb, s->mvectors, 2 * s->nb_mvectors);
502
    if (ret < 0)
503
        goto fail;
504
505
    bytestream2_init(&mv, (uint8_t *)s->mvectors, 2 * s->nb_mvectors * sizeof(*s->mvectors));
506
507
    for (int y = 0; y < avctx->height; y += 16) {
508
        GetByteContext gbyte;
509
        int pfill[3][1] = { {0} };
510
        int nb_codes = get_bits(gb, 16);
511
512
        skip_bits(gb, 8);
513
        if (get_bits_left(gb) < 0) {
514
            ret = AVERROR_INVALIDDATA;
515
            goto fail;
516
        }
517
518
        av_fast_padded_malloc(&s->coeffs, &s->coeffs_size, nb_codes * sizeof(*s->coeffs));
519
        if (!s->coeffs) {
520
            ret = AVERROR(ENOMEM);
521
            goto fail;
522
        }
523
524
        ret = decode_coeffs(gb, s->coeffs, nb_codes);
525
        if (ret < 0)
526
            goto fail;
527
528
        bytestream2_init(&gbyte, (uint8_t *)s->coeffs, nb_codes * sizeof(*s->coeffs));
529
530
        for (int x = 0; x < avctx->width; x += 16) {
531
            if (cnt >= 4)
532
                cnt = 0;
533
            if (cnt == 0) {
534
                if (get_bits_left(&mask) < 8) {
535
                    ret = AVERROR_INVALIDDATA;
536
                    goto fail;
537
                }
538
                flags = get_bits(&mask, 8);
539
            }
540
541
            dst[0] = frame->data[0] + linesize[0] * y + x;
542
            dst[1] = frame->data[0] + linesize[0] * y + x + 8;
543
            dst[2] = frame->data[0] + linesize[0] * (y + 8) + x;
544
            dst[3] = frame->data[0] + linesize[0] * (y + 8) + x + 8;
545
            dst[4] = frame->data[1] + linesize[4] * (y >> 1) + (x >> 1);
546
            dst[5] = frame->data[2] + linesize[5] * (y >> 1) + (x >> 1);
547
548
            if ((flags >> (cnt)) & 1) {
549
                int mv_x = sign_extend(bytestream2_get_ne16(&mv), 16);
550
                int mv_y = sign_extend(bytestream2_get_ne16(&mv), 16);
551
552
                int px = x + mv_x;
553
                int py = y + mv_y;
554
555
                if (px < 0 || px > FFALIGN(avctx->width , 16) - 16 ||
556
                    py < 0 || py > FFALIGN(avctx->height, 16) - 16)
557
                    return AVERROR_INVALIDDATA;
558
559
                src[0] = prev->data[0] + in_linesize[0] * py + px;
560
                src[1] = prev->data[0] + in_linesize[0] * py + px + 8;
561
                src[2] = prev->data[0] + in_linesize[0] * (py + 8) + px;
562
                src[3] = prev->data[0] + in_linesize[0] * (py + 8) + px + 8;
563
                src[4] = prev->data[1] + in_linesize[4] * (py >> 1) + (px >> 1);
564
                src[5] = prev->data[2] + in_linesize[5] * (py >> 1) + (px >> 1);
565
566
                if ((flags >> (cnt + 4)) & 1) {
567
                    for (int b = 0; b < 6; b++)
568
                        copy_block8(dst[b], src[b], linesize[b], in_linesize[b], 8);
569
                } else {
570
                    for (int b = 0; b < 6; b++) {
571
                        int mode = get_bits_le(&mgb, 2);
572
573
                        ret = decode_inter_block(avctx, mode, &gbyte, s->interq_tab[b >= 4],
574
                                                 s->block[b],
575
                                                 pfill[(b >= 4) + (b >= 5)],
576
                                                 dst[b], linesize[b],
577
                                                 src[b], in_linesize[b]);
578
                        if (ret < 0)
579
                            goto fail;
580
                    }
581
                }
582
            } else {
583
                for (int b = 0; b < 6; b++) {
584
                    int mode = get_bits_le(&mgb, 2);
585
586
                    ret = decode_intra_block(avctx, mode, &gbyte, s->intraq_tab[b >= 4],
587
                                             s->block[b],
588
                                             pfill[(b >= 4) + (b >= 5)],
589
                                             dst[b], linesize[b]);
590
                    if (ret < 0)
591
                        goto fail;
592
                }
593
            }
594
595
            cnt++;
596
        }
597
    }
598
599
fail:
600
    return ret;
601
}
602
603
static int decode_frame(AVCodecContext *avctx, void *data,
604
                        int *got_frame, AVPacket *avpkt)
605
{
606
    MV30Context *s = avctx->priv_data;
607
    GetBitContext *gb = &s->gb;
608
    AVFrame *frame = data;
609
    int ret;
610
611
    if ((ret = init_get_bits8(gb, avpkt->data, avpkt->size)) < 0)
612
        return ret;
613
614
    if ((ret = ff_get_buffer(avctx, frame, AV_GET_BUFFER_FLAG_REF)) < 0)
615
        return ret;
616
617
    s->intra_quant = get_bits(gb, 8);
618
    s->inter_quant = s->intra_quant + get_sbits(gb, 8);
619
    s->is_inter = get_bits_le(gb, 16);
620
    s->mode_size = get_bits_le(gb, 16);
621
    if (s->is_inter)
622
        s->nb_mvectors = get_bits_le(gb, 16);
623
624
    get_qtable(s->intraq_tab[0], s->intra_quant, luma_tab);
625
    get_qtable(s->intraq_tab[1], s->intra_quant, chroma_tab);
626
627
    frame->key_frame = s->is_inter == 0;
628
629
    if (frame->key_frame) {
630
        ret = decode_intra(avctx, gb, frame);
631
        if (ret < 0)
632
            return ret;
633
    } else {
634
        get_qtable(s->interq_tab[0], s->inter_quant, luma_tab);
635
        get_qtable(s->interq_tab[1], s->inter_quant, chroma_tab);
636
637
        if (!s->prev_frame->data[0]) {
638
            av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
639
            return AVERROR_INVALIDDATA;
640
        }
641
642
        ret = decode_inter(avctx, gb, frame, s->prev_frame);
643
        if (ret < 0)
644
            return ret;
645
    }
646
647
    av_frame_unref(s->prev_frame);
648
    if ((ret = av_frame_ref(s->prev_frame, frame)) < 0)
649
        return ret;
650
651
    *got_frame = 1;
652
653
    return avpkt->size;
654
}
655
656
static const uint8_t cbp_bits[] = {
657
    2, 2, 3, 3, 3, 4, 5, 6, 7, 8, 9, 9,
658
};
659
660
static av_cold void init_static_data(void)
661
{
662
    INIT_VLC_STATIC_FROM_LENGTHS(&cbp_tab, CBP_VLC_BITS, FF_ARRAY_ELEMS(cbp_bits),
663
                                 cbp_bits, 1, NULL, 0, 0, 0, 0, 1 << CBP_VLC_BITS);
664
}
665
666
static av_cold int decode_init(AVCodecContext *avctx)
667
{
668
    MV30Context *s = avctx->priv_data;
669
    static AVOnce init_static_once = AV_ONCE_INIT;
670
671
    avctx->pix_fmt = AV_PIX_FMT_YUV420P;
672
    avctx->color_range = AVCOL_RANGE_JPEG;
673
674
    ff_blockdsp_init(&s->bdsp, avctx);
675
676
    s->prev_frame = av_frame_alloc();
677
    if (!s->prev_frame)
678
        return AVERROR(ENOMEM);
679
680
    ff_thread_once(&init_static_once, init_static_data);
681
682
    return 0;
683
}
684
685
static void decode_flush(AVCodecContext *avctx)
686
{
687
    MV30Context *s = avctx->priv_data;
688
689
    av_frame_unref(s->prev_frame);
690
}
691
692
static av_cold int decode_close(AVCodecContext *avctx)
693
{
694
    MV30Context *s = avctx->priv_data;
695
696
    av_frame_free(&s->prev_frame);
697
    av_freep(&s->coeffs);
698
    s->coeffs_size = 0;
699
    av_freep(&s->mvectors);
700
    s->mvectors_size = 0;
701
702
    return 0;
703
}
704
705
AVCodec ff_mv30_decoder = {
706
    .name             = "mv30",
707
    .long_name        = NULL_IF_CONFIG_SMALL("MidiVid 3.0"),
708
    .type             = AVMEDIA_TYPE_VIDEO,
709
    .id               = AV_CODEC_ID_MV30,
710
    .priv_data_size   = sizeof(MV30Context),
711
    .init             = decode_init,
712
    .close            = decode_close,
713
    .decode           = decode_frame,
714
    .flush            = decode_flush,
715
    .capabilities     = AV_CODEC_CAP_DR1,
716
    .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |
717
                        FF_CODEC_CAP_INIT_CLEANUP,
718
};