GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/kmvc.c Lines: 130 219 59.4 %
Date: 2019-11-22 03:34:36 Branches: 94 164 57.3 %

Line Branch Exec Source
1
/*
2
 * KMVC decoder
3
 * Copyright (c) 2006 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
 * Karl Morton's Video Codec decoder
25
 */
26
27
#include <stdio.h>
28
#include <stdlib.h>
29
30
#include "avcodec.h"
31
#include "bytestream.h"
32
#include "internal.h"
33
#include "libavutil/common.h"
34
35
#define KMVC_KEYFRAME 0x80
36
#define KMVC_PALETTE  0x40
37
#define KMVC_METHOD   0x0F
38
#define MAX_PALSIZE   256
39
40
/*
41
 * Decoder context
42
 */
43
typedef struct KmvcContext {
44
    AVCodecContext *avctx;
45
46
    int setpal;
47
    int palsize;
48
    uint32_t pal[MAX_PALSIZE];
49
    uint8_t *cur, *prev;
50
    uint8_t frm0[320 * 200], frm1[320 * 200];
51
    GetByteContext g;
52
} KmvcContext;
53
54
typedef struct BitBuf {
55
    int bits;
56
    int bitbuf;
57
} BitBuf;
58
59
#define BLK(data, x, y)  data[av_clip((x) + (y) * 320, 0, 320 * 200 -1)]
60
61
#define kmvc_init_getbits(bb, g)  bb.bits = 7; bb.bitbuf = bytestream2_get_byte(g);
62
63
#define kmvc_getbit(bb, g, res) {\
64
    res = 0; \
65
    if (bb.bitbuf & (1 << bb.bits)) res = 1; \
66
    bb.bits--; \
67
    if(bb.bits == -1) { \
68
        bb.bitbuf = bytestream2_get_byte(g); \
69
        bb.bits = 7; \
70
    } \
71
}
72
73
1
static int kmvc_decode_intra_8x8(KmvcContext * ctx, int w, int h)
74
{
75
    BitBuf bb;
76
    int res, val;
77
    int i, j;
78
    int bx, by;
79
    int l0x, l1x, l0y, l1y;
80
    int mx, my;
81
82
1
    kmvc_init_getbits(bb, &ctx->g);
83
84
21
    for (by = 0; by < h; by += 8)
85
820
        for (bx = 0; bx < w; bx += 8) {
86
800
            if (!bytestream2_get_bytes_left(&ctx->g)) {
87
                av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
88
                return AVERROR_INVALIDDATA;
89
            }
90

800
            kmvc_getbit(bb, &ctx->g, res);
91
800
            if (!res) {         // fill whole 8x8 block
92
800
                val = bytestream2_get_byte(&ctx->g);
93
52000
                for (i = 0; i < 64; i++)
94
51200
                    BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
95
            } else {            // handle four 4x4 subblocks
96
                for (i = 0; i < 4; i++) {
97
                    l0x = bx + (i & 1) * 4;
98
                    l0y = by + (i & 2) * 2;
99
                    kmvc_getbit(bb, &ctx->g, res);
100
                    if (!res) {
101
                        kmvc_getbit(bb, &ctx->g, res);
102
                        if (!res) {     // fill whole 4x4 block
103
                            val = bytestream2_get_byte(&ctx->g);
104
                            for (j = 0; j < 16; j++)
105
                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
106
                        } else {        // copy block from already decoded place
107
                            val = bytestream2_get_byte(&ctx->g);
108
                            mx = val & 0xF;
109
                            my = val >> 4;
110
                            if ((l0x-mx) + 320*(l0y-my) < 0 || (l0x-mx) + 320*(l0y-my) > 320*197 - 4) {
111
                                av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
112
                                return AVERROR_INVALIDDATA;
113
                            }
114
                            for (j = 0; j < 16; j++)
115
                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
116
                                    BLK(ctx->cur, l0x + (j & 3) - mx, l0y + (j >> 2) - my);
117
                        }
118
                    } else {    // descend to 2x2 sub-sub-blocks
119
                        for (j = 0; j < 4; j++) {
120
                            l1x = l0x + (j & 1) * 2;
121
                            l1y = l0y + (j & 2);
122
                            kmvc_getbit(bb, &ctx->g, res);
123
                            if (!res) {
124
                                kmvc_getbit(bb, &ctx->g, res);
125
                                if (!res) {     // fill whole 2x2 block
126
                                    val = bytestream2_get_byte(&ctx->g);
127
                                    BLK(ctx->cur, l1x, l1y) = val;
128
                                    BLK(ctx->cur, l1x + 1, l1y) = val;
129
                                    BLK(ctx->cur, l1x, l1y + 1) = val;
130
                                    BLK(ctx->cur, l1x + 1, l1y + 1) = val;
131
                                } else {        // copy block from already decoded place
132
                                    val = bytestream2_get_byte(&ctx->g);
133
                                    mx = val & 0xF;
134
                                    my = val >> 4;
135
                                    if ((l1x-mx) + 320*(l1y-my) < 0 || (l1x-mx) + 320*(l1y-my) > 320*199 - 2) {
136
                                        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
137
                                        return AVERROR_INVALIDDATA;
138
                                    }
139
                                    BLK(ctx->cur, l1x, l1y) = BLK(ctx->cur, l1x - mx, l1y - my);
140
                                    BLK(ctx->cur, l1x + 1, l1y) =
141
                                        BLK(ctx->cur, l1x + 1 - mx, l1y - my);
142
                                    BLK(ctx->cur, l1x, l1y + 1) =
143
                                        BLK(ctx->cur, l1x - mx, l1y + 1 - my);
144
                                    BLK(ctx->cur, l1x + 1, l1y + 1) =
145
                                        BLK(ctx->cur, l1x + 1 - mx, l1y + 1 - my);
146
                                }
147
                            } else {    // read values for block
148
                                BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
149
                                BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
150
                                BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
151
                                BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
152
                            }
153
                        }
154
                    }
155
                }
156
            }
157
        }
158
159
1
    return 0;
160
}
161
162
75
static int kmvc_decode_inter_8x8(KmvcContext * ctx, int w, int h)
163
{
164
    BitBuf bb;
165
    int res, val;
166
    int i, j;
167
    int bx, by;
168
    int l0x, l1x, l0y, l1y;
169
    int mx, my;
170
171
75
    kmvc_init_getbits(bb, &ctx->g);
172
173
1575
    for (by = 0; by < h; by += 8)
174
61500
        for (bx = 0; bx < w; bx += 8) {
175

60000
            kmvc_getbit(bb, &ctx->g, res);
176
60000
            if (!res) {
177

40230
                kmvc_getbit(bb, &ctx->g, res);
178
40230
                if (!res) {     // fill whole 8x8 block
179
39003
                    if (!bytestream2_get_bytes_left(&ctx->g)) {
180
                        av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
181
                        return AVERROR_INVALIDDATA;
182
                    }
183
39003
                    val = bytestream2_get_byte(&ctx->g);
184
2535195
                    for (i = 0; i < 64; i++)
185
2496192
                        BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) = val;
186
                } else {        // copy block from previous frame
187
79755
                    for (i = 0; i < 64; i++)
188
78528
                        BLK(ctx->cur, bx + (i & 0x7), by + (i >> 3)) =
189
78528
                            BLK(ctx->prev, bx + (i & 0x7), by + (i >> 3));
190
                }
191
            } else {            // handle four 4x4 subblocks
192
19770
                if (!bytestream2_get_bytes_left(&ctx->g)) {
193
                    av_log(ctx->avctx, AV_LOG_ERROR, "Data overrun\n");
194
                    return AVERROR_INVALIDDATA;
195
                }
196
98850
                for (i = 0; i < 4; i++) {
197
79080
                    l0x = bx + (i & 1) * 4;
198
79080
                    l0y = by + (i & 2) * 2;
199

79080
                    kmvc_getbit(bb, &ctx->g, res);
200
79080
                    if (!res) {
201

15620
                        kmvc_getbit(bb, &ctx->g, res);
202
15620
                        if (!res) {     // fill whole 4x4 block
203
6017
                            val = bytestream2_get_byte(&ctx->g);
204
102289
                            for (j = 0; j < 16; j++)
205
96272
                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) = val;
206
                        } else {        // copy block
207
9603
                            val = bytestream2_get_byte(&ctx->g);
208
9603
                            mx = (val & 0xF) - 8;
209
9603
                            my = (val >> 4) - 8;
210

9603
                            if ((l0x+mx) + 320*(l0y+my) < 0 || (l0x+mx) + 320*(l0y+my) > 320*197 - 4) {
211
                                av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
212
                                return AVERROR_INVALIDDATA;
213
                            }
214
163251
                            for (j = 0; j < 16; j++)
215
153648
                                BLK(ctx->cur, l0x + (j & 3), l0y + (j >> 2)) =
216
153648
                                    BLK(ctx->prev, l0x + (j & 3) + mx, l0y + (j >> 2) + my);
217
                        }
218
                    } else {    // descend to 2x2 sub-sub-blocks
219
317300
                        for (j = 0; j < 4; j++) {
220
253840
                            l1x = l0x + (j & 1) * 2;
221
253840
                            l1y = l0y + (j & 2);
222

253840
                            kmvc_getbit(bb, &ctx->g, res);
223
253840
                            if (!res) {
224

126609
                                kmvc_getbit(bb, &ctx->g, res);
225
126609
                                if (!res) {     // fill whole 2x2 block
226
21343
                                    val = bytestream2_get_byte(&ctx->g);
227
21343
                                    BLK(ctx->cur, l1x, l1y) = val;
228
21343
                                    BLK(ctx->cur, l1x + 1, l1y) = val;
229
21343
                                    BLK(ctx->cur, l1x, l1y + 1) = val;
230
21343
                                    BLK(ctx->cur, l1x + 1, l1y + 1) = val;
231
                                } else {        // copy block
232
105266
                                    val = bytestream2_get_byte(&ctx->g);
233
105266
                                    mx = (val & 0xF) - 8;
234
105266
                                    my = (val >> 4) - 8;
235

105266
                                    if ((l1x+mx) + 320*(l1y+my) < 0 || (l1x+mx) + 320*(l1y+my) > 320*199 - 2) {
236
                                        av_log(ctx->avctx, AV_LOG_ERROR, "Invalid MV\n");
237
                                        return AVERROR_INVALIDDATA;
238
                                    }
239
105266
                                    BLK(ctx->cur, l1x, l1y) = BLK(ctx->prev, l1x + mx, l1y + my);
240
105266
                                    BLK(ctx->cur, l1x + 1, l1y) =
241
105266
                                        BLK(ctx->prev, l1x + 1 + mx, l1y + my);
242
105266
                                    BLK(ctx->cur, l1x, l1y + 1) =
243
105266
                                        BLK(ctx->prev, l1x + mx, l1y + 1 + my);
244
105266
                                    BLK(ctx->cur, l1x + 1, l1y + 1) =
245
105266
                                        BLK(ctx->prev, l1x + 1 + mx, l1y + 1 + my);
246
                                }
247
                            } else {    // read values for block
248
127231
                                BLK(ctx->cur, l1x, l1y) = bytestream2_get_byte(&ctx->g);
249
127231
                                BLK(ctx->cur, l1x + 1, l1y) = bytestream2_get_byte(&ctx->g);
250
127231
                                BLK(ctx->cur, l1x, l1y + 1) = bytestream2_get_byte(&ctx->g);
251
127231
                                BLK(ctx->cur, l1x + 1, l1y + 1) = bytestream2_get_byte(&ctx->g);
252
                            }
253
                        }
254
                    }
255
                }
256
            }
257
        }
258
259
75
    return 0;
260
}
261
262
76
static int decode_frame(AVCodecContext * avctx, void *data, int *got_frame,
263
                        AVPacket *avpkt)
264
{
265
76
    KmvcContext *const ctx = avctx->priv_data;
266
76
    AVFrame *frame = data;
267
    uint8_t *out, *src;
268
    int i, ret;
269
    int header;
270
    int blocksize;
271
    int pal_size;
272
76
    const uint8_t *pal = av_packet_get_side_data(avpkt, AV_PKT_DATA_PALETTE, &pal_size);
273
274
76
    bytestream2_init(&ctx->g, avpkt->data, avpkt->size);
275
276
76
    if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
277
        return ret;
278
279
76
    header = bytestream2_get_byte(&ctx->g);
280
281
    /* blocksize 127 is really palette change event */
282
76
    if (bytestream2_peek_byte(&ctx->g) == 127) {
283
        bytestream2_skip(&ctx->g, 3);
284
        for (i = 0; i < 127; i++) {
285
            ctx->pal[i + (header & 0x81)] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
286
            bytestream2_skip(&ctx->g, 1);
287
        }
288
        bytestream2_seek(&ctx->g, -127 * 4 - 3, SEEK_CUR);
289
    }
290
291
76
    if (header & KMVC_KEYFRAME) {
292
1
        frame->key_frame = 1;
293
1
        frame->pict_type = AV_PICTURE_TYPE_I;
294
    } else {
295
75
        frame->key_frame = 0;
296
75
        frame->pict_type = AV_PICTURE_TYPE_P;
297
    }
298
299
76
    if (header & KMVC_PALETTE) {
300
1
        frame->palette_has_changed = 1;
301
        // palette starts from index 1 and has 127 entries
302
256
        for (i = 1; i <= ctx->palsize; i++) {
303
255
            ctx->pal[i] = 0xFFU << 24 | bytestream2_get_be24(&ctx->g);
304
        }
305
    }
306
307

76
    if (pal && pal_size == AVPALETTE_SIZE) {
308
        frame->palette_has_changed = 1;
309
        memcpy(ctx->pal, pal, AVPALETTE_SIZE);
310
76
    } else if (pal) {
311
        av_log(avctx, AV_LOG_ERROR, "Palette size %d is wrong\n", pal_size);
312
    }
313
314
76
    if (ctx->setpal) {
315
        ctx->setpal = 0;
316
        frame->palette_has_changed = 1;
317
    }
318
319
    /* make the palette available on the way out */
320
76
    memcpy(frame->data[1], ctx->pal, 1024);
321
322
76
    blocksize = bytestream2_get_byte(&ctx->g);
323
324

76
    if (blocksize != 8 && blocksize != 127) {
325
        av_log(avctx, AV_LOG_ERROR, "Block size = %i\n", blocksize);
326
        return AVERROR_INVALIDDATA;
327
    }
328
76
    memset(ctx->cur, 0, 320 * 200);
329

76
    switch (header & KMVC_METHOD) {
330
    case 0:
331
    case 1: // used in palette changed event
332
        memcpy(ctx->cur, ctx->prev, 320 * 200);
333
        break;
334
1
    case 3:
335
1
        kmvc_decode_intra_8x8(ctx, avctx->width, avctx->height);
336
1
        break;
337
75
    case 4:
338
75
        kmvc_decode_inter_8x8(ctx, avctx->width, avctx->height);
339
75
        break;
340
    default:
341
        av_log(avctx, AV_LOG_ERROR, "Unknown compression method %i\n", header & KMVC_METHOD);
342
        return AVERROR_INVALIDDATA;
343
    }
344
345
76
    out = frame->data[0];
346
76
    src = ctx->cur;
347
12236
    for (i = 0; i < avctx->height; i++) {
348
12160
        memcpy(out, src, avctx->width);
349
12160
        src += 320;
350
12160
        out += frame->linesize[0];
351
    }
352
353
    /* flip buffers */
354
76
    if (ctx->cur == ctx->frm0) {
355
38
        ctx->cur = ctx->frm1;
356
38
        ctx->prev = ctx->frm0;
357
    } else {
358
38
        ctx->cur = ctx->frm0;
359
38
        ctx->prev = ctx->frm1;
360
    }
361
362
76
    *got_frame = 1;
363
364
    /* always report that the buffer was completely consumed */
365
76
    return avpkt->size;
366
}
367
368
369
370
/*
371
 * Init kmvc decoder
372
 */
373
2
static av_cold int decode_init(AVCodecContext * avctx)
374
{
375
2
    KmvcContext *const c = avctx->priv_data;
376
    int i;
377
378
2
    c->avctx = avctx;
379
380

2
    if (avctx->width > 320 || avctx->height > 200) {
381
        av_log(avctx, AV_LOG_ERROR, "KMVC supports frames <= 320x200\n");
382
        return AVERROR(EINVAL);
383
    }
384
385
2
    c->cur = c->frm0;
386
2
    c->prev = c->frm1;
387
388
514
    for (i = 0; i < 256; i++) {
389
512
        c->pal[i] = 0xFFU << 24 | i * 0x10101;
390
    }
391
392
2
    if (avctx->extradata_size < 12) {
393
        av_log(avctx, AV_LOG_WARNING,
394
               "Extradata missing, decoding may not work properly...\n");
395
        c->palsize = 127;
396
    } else {
397
2
        c->palsize = AV_RL16(avctx->extradata + 10);
398
2
        if (c->palsize >= (unsigned)MAX_PALSIZE) {
399
            c->palsize = 127;
400
            av_log(avctx, AV_LOG_ERROR, "KMVC palette too large\n");
401
            return AVERROR_INVALIDDATA;
402
        }
403
    }
404
405
2
    if (avctx->extradata_size == 1036) {        // palette in extradata
406
        uint8_t *src = avctx->extradata + 12;
407
        for (i = 0; i < 256; i++) {
408
            c->pal[i] = AV_RL32(src);
409
            src += 4;
410
        }
411
        c->setpal = 1;
412
    }
413
414
2
    avctx->pix_fmt = AV_PIX_FMT_PAL8;
415
416
2
    return 0;
417
}
418
419
AVCodec ff_kmvc_decoder = {
420
    .name           = "kmvc",
421
    .long_name      = NULL_IF_CONFIG_SMALL("Karl Morton's video codec"),
422
    .type           = AVMEDIA_TYPE_VIDEO,
423
    .id             = AV_CODEC_ID_KMVC,
424
    .priv_data_size = sizeof(KmvcContext),
425
    .init           = decode_init,
426
    .decode         = decode_frame,
427
    .capabilities   = AV_CODEC_CAP_DR1,
428
};