GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/pafvideo.c Lines: 193 226 85.4 %
Date: 2019-11-18 18:00:01 Branches: 92 126 73.0 %

Line Branch Exec Source
1
/*
2
 * Packed Animation File video decoder
3
 * Copyright (c) 2012 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 "libavutil/imgutils.h"
23
24
#include "avcodec.h"
25
#include "bytestream.h"
26
#include "copy_block.h"
27
#include "internal.h"
28
29
30
static const uint8_t block_sequences[16][8] = {
31
    { 0, 0, 0, 0, 0, 0, 0, 0 },
32
    { 2, 0, 0, 0, 0, 0, 0, 0 },
33
    { 5, 7, 0, 0, 0, 0, 0, 0 },
34
    { 5, 0, 0, 0, 0, 0, 0, 0 },
35
    { 6, 0, 0, 0, 0, 0, 0, 0 },
36
    { 5, 7, 5, 7, 0, 0, 0, 0 },
37
    { 5, 7, 5, 0, 0, 0, 0, 0 },
38
    { 5, 7, 6, 0, 0, 0, 0, 0 },
39
    { 5, 5, 0, 0, 0, 0, 0, 0 },
40
    { 3, 0, 0, 0, 0, 0, 0, 0 },
41
    { 6, 6, 0, 0, 0, 0, 0, 0 },
42
    { 2, 4, 0, 0, 0, 0, 0, 0 },
43
    { 2, 4, 5, 7, 0, 0, 0, 0 },
44
    { 2, 4, 5, 0, 0, 0, 0, 0 },
45
    { 2, 4, 6, 0, 0, 0, 0, 0 },
46
    { 2, 4, 5, 7, 5, 7, 0, 0 },
47
};
48
49
typedef struct PAFVideoDecContext {
50
    AVFrame  *pic;
51
    GetByteContext gb;
52
53
    int width;
54
    int height;
55
56
    int current_frame;
57
    uint8_t *frame[4];
58
    int dirty[4];
59
    int frame_size;
60
    int video_size;
61
62
    uint8_t *opcodes;
63
} PAFVideoDecContext;
64
65
4
static av_cold int paf_video_close(AVCodecContext *avctx)
66
{
67
4
    PAFVideoDecContext *c = avctx->priv_data;
68
    int i;
69
70
4
    av_frame_free(&c->pic);
71
72
20
    for (i = 0; i < 4; i++)
73
16
        av_freep(&c->frame[i]);
74
75
4
    return 0;
76
}
77
78
4
static av_cold int paf_video_init(AVCodecContext *avctx)
79
{
80
4
    PAFVideoDecContext *c = avctx->priv_data;
81
    int i;
82
    int ret;
83
84
4
    c->width  = avctx->width;
85
4
    c->height = avctx->height;
86
87

4
    if (avctx->height & 3 || avctx->width & 3) {
88
        av_log(avctx, AV_LOG_ERROR,
89
               "width %d and height %d must be multiplie of 4.\n",
90
               avctx->width, avctx->height);
91
        return AVERROR_INVALIDDATA;
92
    }
93
94
4
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
95
4
    ret = av_image_check_size2(avctx->width, FFALIGN(avctx->height, 256), avctx->max_pixels, avctx->pix_fmt, 0, avctx);
96
4
    if (ret < 0)
97
        return ret;
98
99
4
    c->pic = av_frame_alloc();
100
4
    if (!c->pic)
101
        return AVERROR(ENOMEM);
102
103
4
    c->frame_size = avctx->width * FFALIGN(avctx->height, 256);
104
4
    c->video_size = avctx->width * avctx->height;
105
20
    for (i = 0; i < 4; i++) {
106
16
        c->frame[i] = av_mallocz(c->frame_size);
107
16
        if (!c->frame[i]) {
108
            paf_video_close(avctx);
109
            return AVERROR(ENOMEM);
110
        }
111
    }
112
113
4
    return 0;
114
}
115
116
612
static void read4x4block(PAFVideoDecContext *c, uint8_t *dst, int width)
117
{
118
    int i;
119
120
3060
    for (i = 0; i < 4; i++) {
121
2448
        bytestream2_get_buffer(&c->gb, dst, 4);
122
2448
        dst += width;
123
    }
124
612
}
125
126
9005
static void copy_color_mask(uint8_t *dst, int width, uint8_t mask, uint8_t color)
127
{
128
    int i;
129
130
45025
    for (i = 0; i < 4; i++) {
131
36020
        if (mask & (1 << 7 - i))
132
7465
            dst[i] = color;
133
36020
        if (mask & (1 << 3 - i))
134
7596
            dst[width + i] = color;
135
    }
136
9005
}
137
138
10810
static void copy_src_mask(uint8_t *dst, int width, uint8_t mask, const uint8_t *src)
139
{
140
    int i;
141
142
54050
    for (i = 0; i < 4; i++) {
143
43240
        if (mask & (1 << 7 - i))
144
14148
            dst[i] = src[i];
145
43240
        if (mask & (1 << 3 - i))
146
14674
            dst[width + i] = src[width + i];
147
    }
148
10810
}
149
150
24878
static void set_src_position(PAFVideoDecContext *c,
151
                             const uint8_t **p,
152
                             const uint8_t **pend)
153
{
154
24878
    int val  = bytestream2_get_be16(&c->gb);
155
24878
    int page = val >> 14;
156
24878
    int x    = (val & 0x7F);
157
24878
    int y    = ((val >> 7) & 0x7F);
158
159
24878
    *p    = c->frame[page] + x * 2 + y * 2 * c->width;
160
24878
    *pend = c->frame[page] + c->frame_size;
161
24878
}
162
163
6
static int decode_0(PAFVideoDecContext *c, uint8_t *pkt, uint8_t code)
164
{
165
    uint32_t opcode_size, offset;
166
6
    uint8_t *dst, *dend, mask = 0, color = 0;
167
    const uint8_t *src, *send, *opcodes;
168
6
    int i, j, op = 0;
169
170
6
    i = bytestream2_get_byte(&c->gb);
171
6
    if (i) {
172
6
        if (code & 0x10) {
173
            int align;
174
175
6
            align = bytestream2_tell(&c->gb) & 3;
176
6
            if (align)
177
6
                bytestream2_skip(&c->gb, 4 - align);
178
        }
179
        do {
180
            int page, val, x, y;
181
6
            val    = bytestream2_get_be16(&c->gb);
182
6
            page   = val >> 14;
183
6
            x      = (val & 0x7F) * 2;
184
6
            y      = ((val >> 7) & 0x7F) * 2;
185
6
            dst    = c->frame[page] + x + y * c->width;
186
6
            dend   = c->frame[page] + c->frame_size;
187
6
            offset = (x & 0x7F) * 2;
188
6
            j      = bytestream2_get_le16(&c->gb) + offset;
189
6
            if (bytestream2_get_bytes_left(&c->gb) < (j - offset) * 16)
190
                return AVERROR_INVALIDDATA;
191
6
            c->dirty[page] = 1;
192
            do {
193
612
                offset++;
194
612
                if (dst + 3 * c->width + 4 > dend)
195
                    return AVERROR_INVALIDDATA;
196
612
                read4x4block(c, dst, c->width);
197
612
                if ((offset & 0x3F) == 0)
198
7
                    dst += c->width * 3;
199
612
                dst += 4;
200
612
            } while (offset < j);
201
6
        } while (--i);
202
    }
203
204
6
    dst  = c->frame[c->current_frame];
205
6
    dend = c->frame[c->current_frame] + c->frame_size;
206
    do {
207
18432
        set_src_position(c, &src, &send);
208
18432
        if ((src + 3 * c->width + 4 > send) ||
209

36864
            (dst + 3 * c->width + 4 > dend) ||
210
18432
            bytestream2_get_bytes_left(&c->gb) < 4)
211
            return AVERROR_INVALIDDATA;
212
18432
        copy_block4(dst, src, c->width, c->width, 4);
213
18432
        i++;
214
18432
        if ((i & 0x3F) == 0)
215
288
            dst += c->width * 3;
216
18432
        dst += 4;
217
18432
    } while (i < c->video_size / 16);
218
219
6
    opcode_size = bytestream2_get_le16(&c->gb);
220
6
    bytestream2_skip(&c->gb, 2);
221
222
6
    if (bytestream2_get_bytes_left(&c->gb) < opcode_size)
223
        return AVERROR_INVALIDDATA;
224
225
6
    opcodes = pkt + bytestream2_tell(&c->gb);
226
6
    bytestream2_skipu(&c->gb, opcode_size);
227
228
6
    dst = c->frame[c->current_frame];
229
230
294
    for (i = 0; i < c->height; i += 4, dst += c->width * 3)
231
18720
        for (j = 0; j < c->width; j += 4, dst += 4) {
232
18432
            int opcode, k = 0;
233
18432
            if (op > opcode_size)
234
                return AVERROR_INVALIDDATA;
235
18432
            if (j & 4) {
236
9216
                opcode = opcodes[op] & 15;
237
9216
                op++;
238
            } else {
239
9216
                opcode = opcodes[op] >> 4;
240
            }
241
242
18432
            while (block_sequences[opcode][k]) {
243
19815
                offset = c->width * 2;
244
19815
                code   = block_sequences[opcode][k++];
245
246

19815
                switch (code) {
247
4435
                case 2:
248
4435
                    offset = 0;
249
5835
                case 3:
250
5835
                    color = bytestream2_get_byte(&c->gb);
251
9005
                case 4:
252
9005
                    mask = bytestream2_get_byte(&c->gb);
253
9005
                    copy_color_mask(dst + offset, c->width, mask, color);
254
9005
                    break;
255
5422
                case 5:
256
5422
                    offset = 0;
257
6446
                case 6:
258
6446
                    set_src_position(c, &src, &send);
259
10810
                case 7:
260
10810
                    if (src + offset + c->width + 4 > send)
261
                        return AVERROR_INVALIDDATA;
262
10810
                    mask = bytestream2_get_byte(&c->gb);
263
10810
                    copy_src_mask(dst + offset, c->width, mask, src + offset);
264
10810
                    break;
265
                }
266
38247
            }
267
        }
268
269
6
    return 0;
270
}
271
272
152
static int paf_video_decode(AVCodecContext *avctx, void *data,
273
                            int *got_frame, AVPacket *pkt)
274
{
275
152
    PAFVideoDecContext *c = avctx->priv_data;
276
    uint8_t code, *dst, *end;
277
    int i, frame, ret;
278
279
152
    if (pkt->size < 2)
280
        return AVERROR_INVALIDDATA;
281
282
152
    bytestream2_init(&c->gb, pkt->data, pkt->size);
283
284
152
    code = bytestream2_get_byte(&c->gb);
285

152
    if ((code & 0xF) > 4 || (code & 0xF) == 3) {
286
        avpriv_request_sample(avctx, "unknown/invalid code");
287
        return AVERROR_INVALIDDATA;
288
    }
289
290
152
    if ((code & 0xF) == 0 &&
291
6
        c->video_size / 32 - (int64_t)bytestream2_get_bytes_left(&c->gb) > c->video_size / 32 * (int64_t)avctx->discard_damaged_percentage / 100)
292
        return AVERROR_INVALIDDATA;
293
294
152
    if ((ret = ff_reget_buffer(avctx, c->pic, 0)) < 0)
295
        return ret;
296
297
152
    if (code & 0x20) {  // frame is keyframe
298
2
        memset(c->pic->data[1], 0, AVPALETTE_SIZE);
299
2
        c->current_frame  = 0;
300
2
        c->pic->key_frame = 1;
301
2
        c->pic->pict_type = AV_PICTURE_TYPE_I;
302
    } else {
303
150
        c->pic->key_frame = 0;
304
150
        c->pic->pict_type = AV_PICTURE_TYPE_P;
305
    }
306
307
152
    if (code & 0x40) {  // palette update
308
2
        uint32_t *out = (uint32_t *)c->pic->data[1];
309
        int index, count;
310
311
2
        index = bytestream2_get_byte(&c->gb);
312
2
        count = bytestream2_get_byte(&c->gb) + 1;
313
314
2
        if (index + count > 256)
315
            return AVERROR_INVALIDDATA;
316
2
        if (bytestream2_get_bytes_left(&c->gb) < 3 * count)
317
            return AVERROR_INVALIDDATA;
318
319
2
        out += index;
320
514
        for (i = 0; i < count; i++) {
321
            unsigned r, g, b;
322
323
512
            r = bytestream2_get_byteu(&c->gb);
324
512
            r = r << 2 | r >> 4;
325
512
            g = bytestream2_get_byteu(&c->gb);
326
512
            g = g << 2 | g >> 4;
327
512
            b = bytestream2_get_byteu(&c->gb);
328
512
            b = b << 2 | b >> 4;
329
512
            *out++ = (0xFFU << 24) | (r << 16) | (g << 8) | b;
330
        }
331
2
        c->pic->palette_has_changed = 1;
332
    }
333
334
152
    c->dirty[c->current_frame] = 1;
335
152
    if (code & 0x20)
336
10
        for (i = 0; i < 4; i++) {
337
8
            if (c->dirty[i])
338
5
                memset(c->frame[i], 0, c->frame_size);
339
8
            c->dirty[i] = 0;
340
        }
341
342

152
    switch (code & 0x0F) {
343
6
    case 0:
344
        /* Block-based motion compensation using 4x4 blocks with either
345
         * horizontal or vertical vectors; might incorporate VQ as well. */
346
6
        if ((ret = decode_0(c, pkt->data, code)) < 0)
347
            return ret;
348
6
        break;
349
    case 1:
350
        /* Uncompressed data. This mode specifies that (width * height) bytes
351
         * should be copied directly from the encoded buffer into the output. */
352
        dst = c->frame[c->current_frame];
353
        // possibly chunk length data
354
        bytestream2_skip(&c->gb, 2);
355
        if (bytestream2_get_bytes_left(&c->gb) < c->video_size)
356
            return AVERROR_INVALIDDATA;
357
        bytestream2_get_bufferu(&c->gb, dst, c->video_size);
358
        break;
359
28
    case 2:
360
        /* Copy reference frame: Consume the next byte in the stream as the
361
         * reference frame (which should be 0, 1, 2, or 3, and should not be
362
         * the same as the current frame number). */
363
28
        frame = bytestream2_get_byte(&c->gb);
364
28
        if (frame > 3)
365
            return AVERROR_INVALIDDATA;
366
28
        if (frame != c->current_frame)
367
7
            memcpy(c->frame[c->current_frame], c->frame[frame], c->frame_size);
368
28
        break;
369
118
    case 4:
370
        /* Run length encoding.*/
371
118
        dst = c->frame[c->current_frame];
372
118
        end = dst + c->video_size;
373
374
118
        bytestream2_skip(&c->gb, 2);
375
376
175341
        while (dst < end) {
377
            int8_t code;
378
            int count;
379
380
175223
            if (bytestream2_get_bytes_left(&c->gb) < 2)
381
                return AVERROR_INVALIDDATA;
382
383
175223
            code  = bytestream2_get_byteu(&c->gb);
384
175223
            count = FFABS(code) + 1;
385
386
175223
            if (dst + count > end)
387
                return AVERROR_INVALIDDATA;
388
175223
            if (code < 0)
389
116135
                memset(dst, bytestream2_get_byteu(&c->gb), count);
390
            else
391
59088
                bytestream2_get_buffer(&c->gb, dst, count);
392
175223
            dst += count;
393
        }
394
118
        break;
395
    default:
396
        av_assert0(0);
397
    }
398
399
152
    av_image_copy_plane(c->pic->data[0], c->pic->linesize[0],
400
152
                        c->frame[c->current_frame], c->width,
401
                        c->width, c->height);
402
403
152
    c->current_frame = (c->current_frame + 1) & 3;
404
152
    if ((ret = av_frame_ref(data, c->pic)) < 0)
405
        return ret;
406
407
152
    *got_frame = 1;
408
409
152
    return pkt->size;
410
}
411
412
AVCodec ff_paf_video_decoder = {
413
    .name           = "paf_video",
414
    .long_name      = NULL_IF_CONFIG_SMALL("Amazing Studio Packed Animation File Video"),
415
    .type           = AVMEDIA_TYPE_VIDEO,
416
    .id             = AV_CODEC_ID_PAF_VIDEO,
417
    .priv_data_size = sizeof(PAFVideoDecContext),
418
    .init           = paf_video_init,
419
    .close          = paf_video_close,
420
    .decode         = paf_video_decode,
421
    .capabilities   = AV_CODEC_CAP_DR1,
422
};