GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pixlet.c Lines: 338 408 82.8 %
Date: 2020-09-25 23:16:12 Branches: 114 178 64.0 %

Line Branch Exec Source
1
/*
2
 * Apple Pixlet decoder
3
 * Copyright (c) 2016 Paul B Mahol
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
#include <stdint.h>
23
24
#include "libavutil/imgutils.h"
25
#include "libavutil/intmath.h"
26
#include "libavutil/opt.h"
27
28
#include "avcodec.h"
29
#include "bytestream.h"
30
#include "get_bits.h"
31
#include "internal.h"
32
#include "thread.h"
33
#include "unary.h"
34
35
#define NB_LEVELS 4
36
37
#define PIXLET_MAGIC 0xDEADBEEF
38
39
#define H 0
40
#define V 1
41
42
typedef struct SubBand {
43
    unsigned width, height;
44
    unsigned size;
45
    unsigned x, y;
46
} SubBand;
47
48
typedef struct PixletContext {
49
    AVClass *class;
50
51
    GetByteContext gb;
52
    GetBitContext bc;
53
54
    int levels;
55
    int depth;
56
    int w, h;
57
58
    int16_t *filter[2];
59
    int16_t *prediction;
60
    int64_t scaling[4][2][NB_LEVELS];
61
    uint16_t lut[65536];
62
    SubBand band[4][NB_LEVELS * 3 + 1];
63
} PixletContext;
64
65
2
static av_cold int pixlet_init(AVCodecContext *avctx)
66
{
67
2
    avctx->pix_fmt     = AV_PIX_FMT_YUV420P16;
68
2
    avctx->color_range = AVCOL_RANGE_JPEG;
69
2
    return 0;
70
}
71
72
3
static void free_buffers(AVCodecContext *avctx)
73
{
74
3
    PixletContext *ctx = avctx->priv_data;
75
76
3
    av_freep(&ctx->filter[0]);
77
3
    av_freep(&ctx->filter[1]);
78
3
    av_freep(&ctx->prediction);
79
3
}
80
81
2
static av_cold int pixlet_close(AVCodecContext *avctx)
82
{
83
2
    PixletContext *ctx = avctx->priv_data;
84
2
    free_buffers(avctx);
85
2
    ctx->w = 0;
86
2
    ctx->h = 0;
87
2
    return 0;
88
}
89
90
1
static int init_decoder(AVCodecContext *avctx)
91
{
92
1
    PixletContext *ctx = avctx->priv_data;
93
    int i, plane;
94
95
1
    ctx->filter[0]  = av_malloc_array(ctx->h, sizeof(int16_t));
96
1
    ctx->filter[1]  = av_malloc_array(FFMAX(ctx->h, ctx->w) + 16, sizeof(int16_t));
97
1
    ctx->prediction = av_malloc_array((ctx->w >> NB_LEVELS), sizeof(int16_t));
98

1
    if (!ctx->filter[0] || !ctx->filter[1] || !ctx->prediction)
99
        return AVERROR(ENOMEM);
100
101
4
    for (plane = 0; plane < 3; plane++) {
102
3
        unsigned shift = plane > 0;
103
3
        unsigned w     = ctx->w >> shift;
104
3
        unsigned h     = ctx->h >> shift;
105
106
3
        ctx->band[plane][0].width  =  w >> NB_LEVELS;
107
3
        ctx->band[plane][0].height =  h >> NB_LEVELS;
108
3
        ctx->band[plane][0].size   = (w >> NB_LEVELS) * (h >> NB_LEVELS);
109
110
39
        for (i = 0; i < NB_LEVELS * 3; i++) {
111
36
            unsigned scale = ctx->levels - (i / 3);
112
113
36
            ctx->band[plane][i + 1].width  =  w >> scale;
114
36
            ctx->band[plane][i + 1].height =  h >> scale;
115
36
            ctx->band[plane][i + 1].size   = (w >> scale) * (h >> scale);
116
117
36
            ctx->band[plane][i + 1].x = (w >> scale) * (((i + 1) % 3) != 2);
118
36
            ctx->band[plane][i + 1].y = (h >> scale) * (((i + 1) % 3) != 1);
119
        }
120
    }
121
122
1
    return 0;
123
}
124
125
9
static int read_low_coeffs(AVCodecContext *avctx, int16_t *dst, int size,
126
                           int width, ptrdiff_t stride)
127
{
128
9
    PixletContext *ctx = avctx->priv_data;
129
9
    GetBitContext *bc = &ctx->bc;
130
9
    unsigned cnt1, nbits, k, j = 0, i = 0;
131
9
    int64_t value, state = 3;
132
9
    int rlen, escape, flag = 0;
133
134
12
    while (i < size) {
135
3
        nbits = FFMIN(ff_clz((state >> 8) + 3) ^ 0x1F, 14);
136
137
3
        cnt1 = get_unary(bc, 0, 8);
138
3
        if (cnt1 < 8) {
139
            value = show_bits(bc, nbits);
140
            if (value <= 1) {
141
                skip_bits(bc, nbits - 1);
142
                escape = ((1 << nbits) - 1) * cnt1;
143
            } else {
144
                skip_bits(bc, nbits);
145
                escape = value + ((1 << nbits) - 1) * cnt1 - 1;
146
            }
147
        } else {
148
3
            escape = get_bits(bc, 16);
149
        }
150
151
3
        value    = -((escape + flag) & 1) | 1;
152
3
        dst[j++] = value * ((escape + flag + 1) >> 1);
153
3
        i++;
154
3
        if (j == width) {
155
3
            j    = 0;
156
3
            dst += stride;
157
        }
158
3
        state = 120 * (escape + flag) + state - (120 * state >> 8);
159
3
        flag  = 0;
160
161

3
        if (state * 4ULL > 0xFF || i >= size)
162
3
            continue;
163
164
        nbits  = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
165
        escape = av_mod_uintp2(16383, nbits);
166
        cnt1   = get_unary(bc, 0, 8);
167
        if (cnt1 > 7) {
168
            rlen = get_bits(bc, 16);
169
        } else {
170
            value = show_bits(bc, nbits);
171
            if (value > 1) {
172
                skip_bits(bc, nbits);
173
                rlen = value + escape * cnt1 - 1;
174
            } else {
175
                skip_bits(bc, nbits - 1);
176
                rlen = escape * cnt1;
177
            }
178
        }
179
180
        if (rlen > size - i)
181
            return AVERROR_INVALIDDATA;
182
        i += rlen;
183
184
        for (k = 0; k < rlen; k++) {
185
            dst[j++] = 0;
186
            if (j == width) {
187
                j    = 0;
188
                dst += stride;
189
            }
190
        }
191
192
        state = 0;
193
        flag  = rlen < 0xFFFF ? 1 : 0;
194
    }
195
196
9
    align_get_bits(bc);
197
9
    return get_bits_count(bc) >> 3;
198
}
199
200
36
static int read_high_coeffs(AVCodecContext *avctx, uint8_t *src, int16_t *dst,
201
                            int size, int c, int a, int d,
202
                            int width, ptrdiff_t stride)
203
{
204
36
    PixletContext *ctx = avctx->priv_data;
205
36
    GetBitContext *bc = &ctx->bc;
206
36
    unsigned cnt1, shbits, rlen, nbits, length, i = 0, j = 0, k;
207
36
    int ret, escape, pfx, value, yflag, xflag, flag = 0;
208
36
    int64_t state = 3, tmp;
209
210
36
    ret = init_get_bits8(bc, src, bytestream2_get_bytes_left(&ctx->gb));
211
36
    if (ret < 0)
212
        return ret;
213
214
36
    if (a ^ (a >> 31)) {
215
36
        nbits = 33 - ff_clz(a ^ (a >> 31));
216
36
        if (nbits > 16)
217
            return AVERROR_INVALIDDATA;
218
    } else {
219
        nbits = 1;
220
    }
221
222
36
    length = 25 - nbits;
223
224
751
    while (i < size) {
225
715
        if (((state >> 8) + 3) & 0xFFFFFFF)
226
715
            value = ff_clz((state >> 8) + 3) ^ 0x1F;
227
        else
228
            value = -1;
229
230
715
        cnt1 = get_unary(bc, 0, length);
231
715
        if (cnt1 >= length) {
232
46
            cnt1 = get_bits(bc, nbits);
233
        } else {
234
669
            pfx = 14 + ((((uint64_t)(value - 14)) >> 32) & (value - 14));
235

669
            if (pfx < 1 || pfx > 25)
236
                return AVERROR_INVALIDDATA;
237
669
            cnt1 *= (1 << pfx) - 1;
238
669
            shbits = show_bits(bc, pfx);
239
669
            if (shbits <= 1) {
240
394
                skip_bits(bc, pfx - 1);
241
            } else {
242
275
                skip_bits(bc, pfx);
243
275
                cnt1 += shbits - 1;
244
            }
245
        }
246
247
715
        xflag = flag + cnt1;
248
715
        yflag = xflag;
249
250
715
        if (flag + cnt1 == 0) {
251
251
            value = 0;
252
        } else {
253
464
            xflag &= 1u;
254
464
            tmp    = (int64_t)c * ((yflag + 1) >> 1) + (c >> 1);
255
464
            value  = xflag + (tmp ^ -xflag);
256
        }
257
258
715
        i++;
259
715
        dst[j++] = value;
260
715
        if (j == width) {
261
85
            j    = 0;
262
85
            dst += stride;
263
        }
264
715
        state += (int64_t)d * (uint64_t)yflag - ((int64_t)(d * (uint64_t)state) >> 8);
265
266
715
        flag = 0;
267
268

715
        if ((uint64_t)state > 0xFF / 4 || i >= size)
269
651
            continue;
270
271
64
        pfx    = ((state + 8) >> 5) + (state ? ff_clz(state) : 32) - 24;
272
64
        escape = av_mod_uintp2(16383, pfx);
273
64
        cnt1   = get_unary(bc, 0, 8);
274
64
        if (cnt1 < 8) {
275

62
            if (pfx < 1 || pfx > 25)
276
                return AVERROR_INVALIDDATA;
277
278
62
            value = show_bits(bc, pfx);
279
62
            if (value > 1) {
280
40
                skip_bits(bc, pfx);
281
40
                rlen = value + escape * cnt1 - 1;
282
            } else {
283
22
                skip_bits(bc, pfx - 1);
284
22
                rlen = escape * cnt1;
285
            }
286
        } else {
287
2
            if (get_bits1(bc))
288
                value = get_bits(bc, 16);
289
            else
290
2
                value = get_bits(bc, 8);
291
292
2
            rlen = value + 8 * escape;
293
        }
294
295

64
        if (rlen > 0xFFFF || i + rlen > size)
296
            return AVERROR_INVALIDDATA;
297
64
        i += rlen;
298
299
879
        for (k = 0; k < rlen; k++) {
300
815
            dst[j++] = 0;
301
815
            if (j == width) {
302
95
                j    = 0;
303
95
                dst += stride;
304
            }
305
        }
306
307
64
        state = 0;
308
64
        flag  = rlen < 0xFFFF ? 1 : 0;
309
    }
310
311
36
    align_get_bits(bc);
312
36
    return get_bits_count(bc) >> 3;
313
}
314
315
3
static int read_highpass(AVCodecContext *avctx, uint8_t *ptr,
316
                         int plane, AVFrame *frame)
317
{
318
3
    PixletContext *ctx = avctx->priv_data;
319
3
    ptrdiff_t stride = frame->linesize[plane] / 2;
320
    int i, ret;
321
322
39
    for (i = 0; i < ctx->levels * 3; i++) {
323
36
        int32_t a = bytestream2_get_be32(&ctx->gb);
324
36
        int32_t b = bytestream2_get_be32(&ctx->gb);
325
36
        int32_t c = bytestream2_get_be32(&ctx->gb);
326
36
        int32_t d = bytestream2_get_be32(&ctx->gb);
327
36
        int16_t *dest = (int16_t *)frame->data[plane] +
328
36
                        ctx->band[plane][i + 1].x +
329
36
                        ctx->band[plane][i + 1].y * stride;
330
36
        unsigned size = ctx->band[plane][i + 1].size;
331
36
        uint32_t magic = bytestream2_get_be32(&ctx->gb);
332
333
36
        if (magic != PIXLET_MAGIC) {
334
            av_log(avctx, AV_LOG_ERROR,
335
                   "wrong magic number: 0x%08"PRIX32" for plane %d, band %d\n",
336
                   magic, plane, i);
337
            return AVERROR_INVALIDDATA;
338
        }
339
340
36
        if (a == INT32_MIN)
341
            return AVERROR_INVALIDDATA;
342
343
36
        ret = read_high_coeffs(avctx, ptr + bytestream2_tell(&ctx->gb), dest, size,
344
36
                               c, (b >= FFABS(a)) ? b : a, d,
345
36
                               ctx->band[plane][i + 1].width, stride);
346
36
        if (ret < 0) {
347
            av_log(avctx, AV_LOG_ERROR,
348
                   "error in highpass coefficients for plane %d, band %d\n",
349
                   plane, i);
350
            return ret;
351
        }
352
36
        bytestream2_skip(&ctx->gb, ret);
353
    }
354
355
3
    return 0;
356
}
357
358
3
static void lowpass_prediction(int16_t *dst, int16_t *pred,
359
                               int width, int height, ptrdiff_t stride)
360
{
361
    int16_t val;
362
    int i, j;
363
364
3
    memset(pred, 0, width * sizeof(*pred));
365
366
7
    for (i = 0; i < height; i++) {
367
4
        val    = pred[0] + dst[0];
368
4
        dst[0] = pred[0] = val;
369
6
        for (j = 1; j < width; j++) {
370
2
            val     = pred[j] + dst[j];
371
2
            dst[j]  = pred[j] = val;
372
2
            dst[j] += dst[j-1];
373
        }
374
4
        dst += stride;
375
    }
376
3
}
377
378
240
static void filterfn(int16_t *dest, int16_t *tmp, unsigned size, int64_t scale)
379
{
380
    int16_t *low, *high, *ll, *lh, *hl, *hh;
381
    int hsize, i, j;
382
    int64_t value;
383
384
240
    hsize = size >> 1;
385
240
    low   = tmp + 4;
386
240
    high  = &low[hsize + 8];
387
388
240
    memcpy(low, dest, size);
389
240
    memcpy(high, dest + hsize, size);
390
391
240
    ll = &low[hsize];
392
240
    lh = &low[hsize];
393
240
    hl = &high[hsize];
394
240
    hh = hl;
395
1200
    for (i = 4, j = 2; i; i--, j++, ll--, hh++, lh++, hl--) {
396
960
        low[i - 5]  = low[j - 1];
397
960
        lh[0]       = ll[-1];
398
960
        high[i - 5] = high[j - 2];
399
960
        hh[0]       = hl[-2];
400
    }
401
402
2280
    for (i = 0; i < hsize; i++) {
403
2040
        value = (int64_t) low [i + 1] * -INT64_C(325392907)  +
404
2040
                (int64_t) low [i + 0] *  INT64_C(3687786320) +
405
2040
                (int64_t) low [i - 1] * -INT64_C(325392907)  +
406
2040
                (int64_t) high[i + 0] *  INT64_C(1518500249) +
407
2040
                (int64_t) high[i - 1] *  INT64_C(1518500249);
408
2040
        dest[i * 2] = av_clip_int16(((value >> 32) * scale) >> 32);
409
    }
410
411
2280
    for (i = 0; i < hsize; i++) {
412
2040
        value = (int64_t) low [i + 2] * -INT64_C(65078576)   +
413
2040
                (int64_t) low [i + 1] *  INT64_C(1583578880) +
414
2040
                (int64_t) low [i + 0] *  INT64_C(1583578880) +
415
2040
                (int64_t) low [i - 1] * -INT64_C(65078576)   +
416
2040
                (int64_t) high[i + 1] *  INT64_C(303700064)  +
417
2040
                (int64_t) high[i + 0] * -INT64_C(3644400640) +
418
2040
                (int64_t) high[i - 1] *  INT64_C(303700064);
419
2040
        dest[i * 2 + 1] = av_clip_int16(((value >> 32) * scale) >> 32);
420
    }
421
240
}
422
423
3
static void reconstruction(AVCodecContext *avctx, int16_t *dest,
424
                           unsigned width, unsigned height, ptrdiff_t stride,
425
                           int64_t *scaling_h, int64_t *scaling_v)
426
{
427
3
    PixletContext *ctx = avctx->priv_data;
428
    unsigned scaled_width, scaled_height;
429
    int16_t *ptr, *tmp;
430
    int i, j, k;
431
432
3
    scaled_width  = width  >> NB_LEVELS;
433
3
    scaled_height = height >> NB_LEVELS;
434
3
    tmp           = ctx->filter[0];
435
436
15
    for (i = 0; i < NB_LEVELS; i++) {
437
12
        int64_t scale_v = scaling_v[i];
438
12
        int64_t scale_h = scaling_h[i];
439
12
        scaled_width  <<= 1;
440
12
        scaled_height <<= 1;
441
442
12
        ptr = dest;
443
132
        for (j = 0; j < scaled_height; j++) {
444
120
            filterfn(ptr, ctx->filter[1], scaled_width, scale_v);
445
120
            ptr += stride;
446
        }
447
448
132
        for (j = 0; j < scaled_width; j++) {
449
120
            ptr = dest + j;
450
2160
            for (k = 0; k < scaled_height; k++) {
451
2040
                tmp[k] = *ptr;
452
2040
                ptr   += stride;
453
            }
454
455
120
            filterfn(tmp, ctx->filter[1], scaled_height, scale_h);
456
457
120
            ptr = dest + j;
458
2160
            for (k = 0; k < scaled_height; k++) {
459
2040
                *ptr = tmp[k];
460
2040
                ptr += stride;
461
            }
462
        }
463
    }
464
3
}
465
466
1
static void build_luma_lut(AVCodecContext *avctx, int depth)
467
{
468
1
    PixletContext *ctx = avctx->priv_data;
469
1
    int max = (1 << depth) - 1;
470
471
1
    if (ctx->depth == depth)
472
        return;
473
1
    ctx->depth = depth;
474
475
65537
    for (int i = 0; i < FF_ARRAY_ELEMS(ctx->lut); i++)
476
65536
        ctx->lut[i] = ((int64_t)i * i * 65535LL) / max / max;
477
}
478
479
1
static void postprocess_luma(AVCodecContext *avctx, AVFrame *frame,
480
                             int w, int h, int depth)
481
{
482
1
    PixletContext *ctx = avctx->priv_data;
483
1
    uint16_t *dsty = (uint16_t *)frame->data[0];
484
1
    int16_t *srcy  = (int16_t *)frame->data[0];
485
1
    ptrdiff_t stridey = frame->linesize[0] / 2;
486
1
    uint16_t *lut = ctx->lut;
487
    int i, j;
488
489
33
    for (j = 0; j < h; j++) {
490
1056
        for (i = 0; i < w; i++) {
491
1024
            if (srcy[i] <= 0)
492
1
                dsty[i] = 0;
493
1023
            else if (srcy[i] > ((1 << depth) - 1))
494
                dsty[i] = 65535;
495
            else
496
1023
                dsty[i] = lut[srcy[i]];
497
        }
498
32
        dsty += stridey;
499
32
        srcy += stridey;
500
    }
501
1
}
502
503
1
static void postprocess_chroma(AVFrame *frame, int w, int h, int depth)
504
{
505
1
    uint16_t *dstu = (uint16_t *)frame->data[1];
506
1
    uint16_t *dstv = (uint16_t *)frame->data[2];
507
1
    int16_t *srcu  = (int16_t *)frame->data[1];
508
1
    int16_t *srcv  = (int16_t *)frame->data[2];
509
1
    ptrdiff_t strideu = frame->linesize[1] / 2;
510
1
    ptrdiff_t stridev = frame->linesize[2] / 2;
511
1
    const unsigned add = 1 << (depth - 1);
512
1
    const unsigned shift = 16 - depth;
513
    int i, j;
514
515
17
    for (j = 0; j < h; j++) {
516
272
        for (i = 0; i < w; i++) {
517
256
            dstu[i] = av_clip_uintp2_c(add + srcu[i], depth) << shift;
518
256
            dstv[i] = av_clip_uintp2_c(add + srcv[i], depth) << shift;
519
        }
520
16
        dstu += strideu;
521
16
        dstv += stridev;
522
16
        srcu += strideu;
523
16
        srcv += stridev;
524
    }
525
1
}
526
527
3
static int decode_plane(AVCodecContext *avctx, int plane,
528
                        AVPacket *avpkt, AVFrame *frame)
529
{
530
3
    PixletContext *ctx = avctx->priv_data;
531
3
    ptrdiff_t stride   = frame->linesize[plane] / 2;
532
3
    unsigned shift     = plane > 0;
533
    int16_t *dst;
534
    int i, ret;
535
536
15
    for (i = ctx->levels - 1; i >= 0; i--) {
537
12
        int32_t h = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
538
12
        int32_t v = sign_extend(bytestream2_get_be32(&ctx->gb), 32);
539
540

12
        if (!h || !v)
541
            return AVERROR_INVALIDDATA;
542
543
12
        ctx->scaling[plane][H][i] = (1000000ULL << 32) / h;
544
12
        ctx->scaling[plane][V][i] = (1000000ULL << 32) / v;
545
    }
546
547
3
    bytestream2_skip(&ctx->gb, 4);
548
549
3
    dst    = (int16_t *)frame->data[plane];
550
3
    dst[0] = sign_extend(bytestream2_get_be16(&ctx->gb), 16);
551
552
3
    ret = init_get_bits8(&ctx->bc, avpkt->data + bytestream2_tell(&ctx->gb),
553
                         bytestream2_get_bytes_left(&ctx->gb));
554
3
    if (ret < 0)
555
        return ret;
556
557
3
    ret = read_low_coeffs(avctx, dst + 1, ctx->band[plane][0].width - 1,
558
3
                          ctx->band[plane][0].width - 1, 0);
559
3
    if (ret < 0) {
560
        av_log(avctx, AV_LOG_ERROR,
561
               "error in lowpass coefficients for plane %d, top row\n", plane);
562
        return ret;
563
    }
564
565
3
    ret = read_low_coeffs(avctx, dst + stride,
566
3
                          ctx->band[plane][0].height - 1, 1, stride);
567
3
    if (ret < 0) {
568
        av_log(avctx, AV_LOG_ERROR,
569
               "error in lowpass coefficients for plane %d, left column\n",
570
               plane);
571
        return ret;
572
    }
573
574
3
    ret = read_low_coeffs(avctx, dst + stride + 1,
575
3
                          (ctx->band[plane][0].width - 1) * (ctx->band[plane][0].height - 1),
576
3
                          ctx->band[plane][0].width - 1, stride);
577
3
    if (ret < 0) {
578
        av_log(avctx, AV_LOG_ERROR,
579
               "error in lowpass coefficients for plane %d, rest\n", plane);
580
        return ret;
581
    }
582
583
3
    bytestream2_skip(&ctx->gb, ret);
584
3
    if (bytestream2_get_bytes_left(&ctx->gb) <= 0) {
585
        av_log(avctx, AV_LOG_ERROR, "no bytes left\n");
586
        return AVERROR_INVALIDDATA;
587
    }
588
589
3
    ret = read_highpass(avctx, avpkt->data, plane, frame);
590
3
    if (ret < 0)
591
        return ret;
592
593
3
    lowpass_prediction(dst, ctx->prediction, ctx->band[plane][0].width,
594
3
                       ctx->band[plane][0].height, stride);
595
596
3
    reconstruction(avctx, (int16_t *)frame->data[plane], ctx->w >> shift,
597
3
                   ctx->h >> shift, stride, ctx->scaling[plane][H],
598
3
                   ctx->scaling[plane][V]);
599
600
3
    return 0;
601
}
602
603
1
static int pixlet_decode_frame(AVCodecContext *avctx, void *data,
604
                               int *got_frame, AVPacket *avpkt)
605
{
606
1
    PixletContext *ctx = avctx->priv_data;
607
    int i, w, h, width, height, ret, version;
608
1
    AVFrame *p = data;
609
1
    ThreadFrame frame = { .f = data };
610
    uint32_t pktsize, depth;
611
612
1
    bytestream2_init(&ctx->gb, avpkt->data, avpkt->size);
613
614
1
    pktsize = bytestream2_get_be32(&ctx->gb);
615

1
    if (pktsize <= 44 || pktsize - 4 > bytestream2_get_bytes_left(&ctx->gb)) {
616
        av_log(avctx, AV_LOG_ERROR, "Invalid packet size %"PRIu32"\n", pktsize);
617
        return AVERROR_INVALIDDATA;
618
    }
619
620
1
    version = bytestream2_get_le32(&ctx->gb);
621
1
    if (version != 1)
622
        avpriv_request_sample(avctx, "Version %d", version);
623
624
1
    bytestream2_skip(&ctx->gb, 4);
625
1
    if (bytestream2_get_be32(&ctx->gb) != 1)
626
        return AVERROR_INVALIDDATA;
627
1
    bytestream2_skip(&ctx->gb, 4);
628
629
1
    width  = bytestream2_get_be32(&ctx->gb);
630
1
    height = bytestream2_get_be32(&ctx->gb);
631
632
1
    if (    width > INT_MAX - (1U << (NB_LEVELS + 1))
633
1
        || height > INT_MAX - (1U << (NB_LEVELS + 1)))
634
        return AVERROR_INVALIDDATA;
635
636
1
    w = FFALIGN(width,  1 << (NB_LEVELS + 1));
637
1
    h = FFALIGN(height, 1 << (NB_LEVELS + 1));
638
639
1
    ctx->levels = bytestream2_get_be32(&ctx->gb);
640
1
    if (ctx->levels != NB_LEVELS)
641
        return AVERROR_INVALIDDATA;
642
1
    depth = bytestream2_get_be32(&ctx->gb);
643

1
    if (depth < 8 || depth > 15) {
644
        avpriv_request_sample(avctx, "Depth %d", depth);
645
        return AVERROR_INVALIDDATA;
646
    }
647
648
1
    build_luma_lut(avctx, depth);
649
650
1
    ret = ff_set_dimensions(avctx, w, h);
651
1
    if (ret < 0)
652
        return ret;
653
1
    avctx->width  = width;
654
1
    avctx->height = height;
655
656

1
    if (ctx->w != w || ctx->h != h) {
657
1
        free_buffers(avctx);
658
1
        ctx->w = w;
659
1
        ctx->h = h;
660
661
1
        ret = init_decoder(avctx);
662
1
        if (ret < 0) {
663
            free_buffers(avctx);
664
            ctx->w = 0;
665
            ctx->h = 0;
666
            return ret;
667
        }
668
    }
669
670
1
    bytestream2_skip(&ctx->gb, 8);
671
672
1
    p->pict_type = AV_PICTURE_TYPE_I;
673
1
    p->key_frame = 1;
674
1
    p->color_range = AVCOL_RANGE_JPEG;
675
676
1
    ret = ff_thread_get_buffer(avctx, &frame, 0);
677
1
    if (ret < 0)
678
        return ret;
679
680
4
    for (i = 0; i < 3; i++) {
681
3
        ret = decode_plane(avctx, i, avpkt, frame.f);
682
3
        if (ret < 0)
683
            return ret;
684
3
        if (avctx->flags & AV_CODEC_FLAG_GRAY)
685
            break;
686
    }
687
688
1
    postprocess_luma(avctx, frame.f, ctx->w, ctx->h, ctx->depth);
689
1
    postprocess_chroma(frame.f, ctx->w >> 1, ctx->h >> 1, ctx->depth);
690
691
1
    *got_frame = 1;
692
693
1
    return pktsize;
694
}
695
696
AVCodec ff_pixlet_decoder = {
697
    .name             = "pixlet",
698
    .long_name        = NULL_IF_CONFIG_SMALL("Apple Pixlet"),
699
    .type             = AVMEDIA_TYPE_VIDEO,
700
    .id               = AV_CODEC_ID_PIXLET,
701
    .init             = pixlet_init,
702
    .close            = pixlet_close,
703
    .decode           = pixlet_decode_frame,
704
    .priv_data_size   = sizeof(PixletContext),
705
    .capabilities     = AV_CODEC_CAP_DR1 |
706
                        AV_CODEC_CAP_FRAME_THREADS,
707
    .caps_internal    = FF_CODEC_CAP_INIT_THREADSAFE |
708
                        FF_CODEC_CAP_INIT_CLEANUP,
709
};