GCC Code Coverage Report
Directory: ../../../ffmpeg/ Exec Total Coverage
File: src/libavcodec/truemotion1.c Lines: 265 355 74.6 %
Date: 2020-10-23 17:01:47 Branches: 290 734 39.5 %

Line Branch Exec Source
1
/*
2
 * Duck TrueMotion 1.0 Decoder
3
 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
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
 * Duck TrueMotion v1 Video Decoder by
25
 * Alex Beregszaszi and
26
 * Mike Melanson (melanson@pcisys.net)
27
 *
28
 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
29
 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
30
 */
31
32
#include <stdio.h>
33
#include <stdlib.h>
34
#include <string.h>
35
36
#include "avcodec.h"
37
#include "internal.h"
38
#include "libavutil/imgutils.h"
39
#include "libavutil/internal.h"
40
#include "libavutil/intreadwrite.h"
41
#include "libavutil/mem.h"
42
43
#include "truemotion1data.h"
44
45
typedef struct TrueMotion1Context {
46
    AVCodecContext *avctx;
47
    AVFrame *frame;
48
49
    const uint8_t *buf;
50
    int size;
51
52
    const uint8_t *mb_change_bits;
53
    int mb_change_bits_row_size;
54
    const uint8_t *index_stream;
55
    int index_stream_size;
56
57
    int flags;
58
    int x, y, w, h;
59
60
    uint32_t y_predictor_table[1024];
61
    uint32_t c_predictor_table[1024];
62
    uint32_t fat_y_predictor_table[1024];
63
    uint32_t fat_c_predictor_table[1024];
64
65
    int compression;
66
    int block_type;
67
    int block_width;
68
    int block_height;
69
70
    int16_t ydt[8];
71
    int16_t cdt[8];
72
    int16_t fat_ydt[8];
73
    int16_t fat_cdt[8];
74
75
    int last_deltaset, last_vectable;
76
77
    unsigned int *vert_pred;
78
    int vert_pred_size;
79
80
} TrueMotion1Context;
81
82
#define FLAG_SPRITE         32
83
#define FLAG_KEYFRAME       16
84
#define FLAG_INTERFRAME      8
85
#define FLAG_INTERPOLATED    4
86
87
struct frame_header {
88
    uint8_t header_size;
89
    uint8_t compression;
90
    uint8_t deltaset;
91
    uint8_t vectable;
92
    uint16_t ysize;
93
    uint16_t xsize;
94
    uint16_t checksum;
95
    uint8_t version;
96
    uint8_t header_type;
97
    uint8_t flags;
98
    uint8_t control;
99
    uint16_t xoffset;
100
    uint16_t yoffset;
101
    uint16_t width;
102
    uint16_t height;
103
};
104
105
#define ALGO_NOP        0
106
#define ALGO_RGB16V     1
107
#define ALGO_RGB16H     2
108
#define ALGO_RGB24H     3
109
110
/* these are the various block sizes that can occupy a 4x4 block */
111
#define BLOCK_2x2  0
112
#define BLOCK_2x4  1
113
#define BLOCK_4x2  2
114
#define BLOCK_4x4  3
115
116
typedef struct comp_types {
117
    int algorithm;
118
    int block_width; // vres
119
    int block_height; // hres
120
    int block_type;
121
} comp_types;
122
123
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
124
static const comp_types compression_types[17] = {
125
    { ALGO_NOP,    0, 0, 0 },
126
127
    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
128
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
129
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
130
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
131
132
    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
133
    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
134
    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
135
    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
136
137
    { ALGO_NOP,    4, 4, BLOCK_4x4 },
138
    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
139
    { ALGO_NOP,    4, 2, BLOCK_4x2 },
140
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
141
142
    { ALGO_NOP,    2, 4, BLOCK_2x4 },
143
    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
144
    { ALGO_NOP,    2, 2, BLOCK_2x2 },
145
    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
146
};
147
148
4
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
149
{
150
    int i;
151
152
4
    if (delta_table_index > 3)
153
        return;
154
155
4
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
156
4
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
157
4
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
158
4
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
159
160
    /* Y skinny deltas need to be halved for some reason; maybe the
161
     * skinny Y deltas should be modified */
162
36
    for (i = 0; i < 8; i++)
163
    {
164
        /* drop the lsb before dividing by 2-- net effect: round down
165
         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
166
32
        s->ydt[i] &= 0xFFFE;
167
32
        s->ydt[i] /= 2;
168
    }
169
}
170
171
#if HAVE_BIGENDIAN
172
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
173
#else
174
1104
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
175
#endif
176
{
177
    int lo, hi;
178
179
1104
    lo = ydt[p1];
180
1104
    lo += (lo * 32) + (lo * 1024);
181
1104
    hi = ydt[p2];
182
1104
    hi += (hi * 32) + (hi * 1024);
183
1104
    return (lo + (hi * (1U << 16))) * 2;
184
}
185
186
1104
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
187
{
188
    int r, b, lo;
189
190
1104
    b = cdt[p2];
191
1104
    r = cdt[p1] * 1024;
192
1104
    lo = b + r;
193
1104
    return (lo + (lo * (1U << 16))) * 2;
194
}
195
196
#if HAVE_BIGENDIAN
197
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
198
#else
199
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
200
#endif
201
{
202
    int lo, hi;
203
204
    lo = ydt[p1];
205
    lo += (lo << 6) + (lo << 11);
206
    hi = ydt[p2];
207
    hi += (hi << 6) + (hi << 11);
208
    return (lo + (hi << 16)) << 1;
209
}
210
211
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
212
{
213
    int r, b, lo;
214
215
    b = cdt[p2];
216
    r = cdt[p1] << 11;
217
    lo = b + r;
218
    return (lo + (lo * (1 << 16))) * 2;
219
}
220
221
2048
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
222
{
223
    int lo, hi;
224
225
2048
    lo = ydt[p1];
226
2048
    hi = ydt[p2];
227
2048
    return (lo + (hi * (1 << 8)) + (hi * (1 << 16))) * 2;
228
}
229
230
2048
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
231
{
232
    int r, b;
233
234
2048
    b = cdt[p2];
235
2048
    r = cdt[p1] * (1 << 16);
236
2048
    return (b+r) * 2;
237
}
238
239
2
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
240
{
241
    int len, i, j;
242
    unsigned char delta_pair;
243
244
514
    for (i = 0; i < 1024; i += 4)
245
    {
246
512
        len = *sel_vector_table++ / 2;
247
1616
        for (j = 0; j < len; j++)
248
        {
249
1104
            delta_pair = *sel_vector_table++;
250
1104
            s->y_predictor_table[i+j] = 0xfffffffe &
251
1104
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
252
1104
            s->c_predictor_table[i+j] = 0xfffffffe &
253
1104
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
254
        }
255
512
        s->y_predictor_table[i+(j-1)] |= 1;
256
512
        s->c_predictor_table[i+(j-1)] |= 1;
257
    }
258
2
}
259
260
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
261
{
262
    int len, i, j;
263
    unsigned char delta_pair;
264
265
    for (i = 0; i < 1024; i += 4)
266
    {
267
        len = *sel_vector_table++ / 2;
268
        for (j = 0; j < len; j++)
269
        {
270
            delta_pair = *sel_vector_table++;
271
            s->y_predictor_table[i+j] = 0xfffffffe &
272
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
273
            s->c_predictor_table[i+j] = 0xfffffffe &
274
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
275
        }
276
        s->y_predictor_table[i+(j-1)] |= 1;
277
        s->c_predictor_table[i+(j-1)] |= 1;
278
    }
279
}
280
281
2
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
282
{
283
    int len, i, j;
284
    unsigned char delta_pair;
285
286
514
    for (i = 0; i < 1024; i += 4)
287
    {
288
512
        len = *sel_vector_table++ / 2;
289
1536
        for (j = 0; j < len; j++)
290
        {
291
1024
            delta_pair = *sel_vector_table++;
292
1024
            s->y_predictor_table[i+j] = 0xfffffffe &
293
1024
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
294
1024
            s->c_predictor_table[i+j] = 0xfffffffe &
295
1024
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
296
1024
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
297
1024
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
298
1024
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
299
1024
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
300
        }
301
512
        s->y_predictor_table[i+(j-1)] |= 1;
302
512
        s->c_predictor_table[i+(j-1)] |= 1;
303
512
        s->fat_y_predictor_table[i+(j-1)] |= 1;
304
512
        s->fat_c_predictor_table[i+(j-1)] |= 1;
305
    }
306
2
}
307
308
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
309
 * there was an error while decoding the header */
310
123
static int truemotion1_decode_header(TrueMotion1Context *s)
311
{
312
    int i, ret;
313
123
    int width_shift = 0;
314
    int new_pix_fmt;
315
    struct frame_header header;
316
123
    uint8_t header_buffer[128] = { 0 };  /* logical maximum size of the header */
317
    const uint8_t *sel_vector_table;
318
319
123
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
320
123
    if (s->buf[0] < 0x10)
321
    {
322
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
323
        return AVERROR_INVALIDDATA;
324
    }
325
326
123
    if (header.header_size + 1 > s->size) {
327
        av_log(s->avctx, AV_LOG_ERROR, "Input packet too small.\n");
328
        return AVERROR_INVALIDDATA;
329
    }
330
331
    /* unscramble the header bytes with a XOR operation */
332
1816
    for (i = 1; i < header.header_size; i++)
333
1693
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
334
335
123
    header.compression = header_buffer[0];
336
123
    header.deltaset = header_buffer[1];
337
123
    header.vectable = header_buffer[2];
338
123
    header.ysize = AV_RL16(&header_buffer[3]);
339
123
    header.xsize = AV_RL16(&header_buffer[5]);
340
123
    header.checksum = AV_RL16(&header_buffer[7]);
341
123
    header.version = header_buffer[9];
342
123
    header.header_type = header_buffer[10];
343
123
    header.flags = header_buffer[11];
344
123
    header.control = header_buffer[12];
345
346
    /* Version 2 */
347
123
    if (header.version >= 2)
348
    {
349
123
        if (header.header_type > 3)
350
        {
351
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
352
            return AVERROR_INVALIDDATA;
353

123
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
354
123
            s->flags = header.flags;
355
123
            if (!(s->flags & FLAG_INTERFRAME))
356
                s->flags |= FLAG_KEYFRAME;
357
        } else
358
            s->flags = FLAG_KEYFRAME;
359
    } else /* Version 1 */
360
        s->flags = FLAG_KEYFRAME;
361
362
123
    if (s->flags & FLAG_SPRITE) {
363
        avpriv_request_sample(s->avctx, "Frame with sprite");
364
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
365
        return AVERROR_PATCHWELCOME;
366
    } else {
367
123
        s->w = header.xsize;
368
123
        s->h = header.ysize;
369
123
        if (header.header_type < 2) {
370
            if ((s->w < 213) && (s->h >= 176))
371
            {
372
                s->flags |= FLAG_INTERPOLATED;
373
                avpriv_request_sample(s->avctx, "Interpolated frame");
374
            }
375
        }
376
    }
377
378
123
    if (header.compression >= 17) {
379
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
380
        return AVERROR_INVALIDDATA;
381
    }
382
383
123
    if ((header.deltaset != s->last_deltaset) ||
384
121
        (header.vectable != s->last_vectable))
385
4
        select_delta_tables(s, header.deltaset);
386
387

123
    if ((header.compression & 1) && header.header_type)
388
        sel_vector_table = pc_tbl2;
389
    else {
390

123
        if (header.vectable > 0 && header.vectable < 4)
391
123
            sel_vector_table = tables[header.vectable - 1];
392
        else {
393
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
394
            return AVERROR_INVALIDDATA;
395
        }
396
    }
397
398
123
    if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
399
17
        new_pix_fmt = AV_PIX_FMT_0RGB32;
400
17
        width_shift = 1;
401
    } else
402
106
        new_pix_fmt = AV_PIX_FMT_RGB555; // RGB565 is supported as well
403
404
123
    s->w >>= width_shift;
405
123
    if (s->w & 1) {
406
        avpriv_request_sample(s->avctx, "Frame with odd width");
407
        return AVERROR_PATCHWELCOME;
408
    }
409
410

123
    if (s->w != s->avctx->width || s->h != s->avctx->height ||
411
122
        new_pix_fmt != s->avctx->pix_fmt) {
412
2
        av_frame_unref(s->frame);
413
2
        s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
414
2
        s->avctx->pix_fmt = new_pix_fmt;
415
416
2
        if ((ret = ff_set_dimensions(s->avctx, s->w, s->h)) < 0)
417
            return ret;
418
419
2
        ff_set_sar(s->avctx, s->avctx->sample_aspect_ratio);
420
421
2
        av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
422
2
        if (!s->vert_pred)
423
            return AVERROR(ENOMEM);
424
    }
425
426
    /* There is 1 change bit per 4 pixels, so each change byte represents
427
     * 32 pixels; divide width by 4 to obtain the number of change bits and
428
     * then round up to the nearest byte. */
429
123
    s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
430
431

123
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
432
    {
433
4
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
434
2
            gen_vector_table24(s, sel_vector_table);
435
        else
436
2
        if (s->avctx->pix_fmt == AV_PIX_FMT_RGB555)
437
2
            gen_vector_table15(s, sel_vector_table);
438
        else
439
            gen_vector_table16(s, sel_vector_table);
440
    }
441
442
    /* set up pointers to the other key data chunks */
443
123
    s->mb_change_bits = s->buf + header.header_size;
444
123
    if (s->flags & FLAG_KEYFRAME) {
445
        /* no change bits specified for a keyframe; only index bytes */
446
25
        s->index_stream = s->mb_change_bits;
447
25
        if (s->avctx->width * s->avctx->height / 2048 + header.header_size > s->size)
448
            return AVERROR_INVALIDDATA;
449
    } else {
450
        /* one change bit per 4x4 block */
451
98
        s->index_stream = s->mb_change_bits +
452
98
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
453
    }
454
123
    s->index_stream_size = s->size - (s->index_stream - s->buf);
455
456
123
    s->last_deltaset = header.deltaset;
457
123
    s->last_vectable = header.vectable;
458
123
    s->compression = header.compression;
459
123
    s->block_width = compression_types[header.compression].block_width;
460
123
    s->block_height = compression_types[header.compression].block_height;
461
123
    s->block_type = compression_types[header.compression].block_type;
462
463
123
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
464
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
465
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
466
            s->block_height, s->block_type,
467
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
468
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
469
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
470
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
471
472
123
    return header.header_size;
473
}
474
475
4
static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
476
{
477
4
    TrueMotion1Context *s = avctx->priv_data;
478
479
4
    s->avctx = avctx;
480
481
    // FIXME: it may change ?
482
//    if (avctx->bits_per_sample == 24)
483
//        avctx->pix_fmt = AV_PIX_FMT_RGB24;
484
//    else
485
//        avctx->pix_fmt = AV_PIX_FMT_RGB555;
486
487
4
    s->frame = av_frame_alloc();
488
4
    if (!s->frame)
489
        return AVERROR(ENOMEM);
490
491
    /* there is a vertical predictor for each pixel in a line; each vertical
492
     * predictor is 0 to start with */
493
4
    av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
494
4
    if (!s->vert_pred)
495
        return AVERROR(ENOMEM);
496
497
4
    return 0;
498
}
499
500
/*
501
Block decoding order:
502
503
dxi: Y-Y
504
dxic: Y-C-Y
505
dxic2: Y-C-Y-C
506
507
hres,vres,i,i%vres (0 < i < 4)
508
2x2 0: 0 dxic2
509
2x2 1: 1 dxi
510
2x2 2: 0 dxic2
511
2x2 3: 1 dxi
512
2x4 0: 0 dxic2
513
2x4 1: 1 dxi
514
2x4 2: 2 dxi
515
2x4 3: 3 dxi
516
4x2 0: 0 dxic
517
4x2 1: 1 dxi
518
4x2 2: 0 dxic
519
4x2 3: 1 dxi
520
4x4 0: 0 dxic
521
4x4 1: 1 dxi
522
4x4 2: 2 dxi
523
4x4 3: 3 dxi
524
*/
525
526
#define GET_NEXT_INDEX() \
527
{\
528
    if (index_stream_index >= s->index_stream_size) { \
529
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
530
        return; \
531
    } \
532
    index = s->index_stream[index_stream_index++] * 4; \
533
}
534
535
#define INC_INDEX                                                   \
536
do {                                                                \
537
    if (index >= 1023) {                                            \
538
        av_log(s->avctx, AV_LOG_ERROR, "Invalid index value.\n");   \
539
        return;                                                     \
540
    }                                                               \
541
    index++;                                                        \
542
} while (0)
543
544
#define APPLY_C_PREDICTOR() \
545
    predictor_pair = s->c_predictor_table[index]; \
546
    horiz_pred += (predictor_pair >> 1); \
547
    if (predictor_pair & 1) { \
548
        GET_NEXT_INDEX() \
549
        if (!index) { \
550
            GET_NEXT_INDEX() \
551
            predictor_pair = s->c_predictor_table[index]; \
552
            horiz_pred += ((predictor_pair >> 1) * 5); \
553
            if (predictor_pair & 1) \
554
                GET_NEXT_INDEX() \
555
            else \
556
                INC_INDEX; \
557
        } \
558
    } else \
559
        INC_INDEX;
560
561
#define APPLY_C_PREDICTOR_24() \
562
    predictor_pair = s->c_predictor_table[index]; \
563
    horiz_pred += (predictor_pair >> 1); \
564
    if (predictor_pair & 1) { \
565
        GET_NEXT_INDEX() \
566
        if (!index) { \
567
            GET_NEXT_INDEX() \
568
            predictor_pair = s->fat_c_predictor_table[index]; \
569
            horiz_pred += (predictor_pair >> 1); \
570
            if (predictor_pair & 1) \
571
                GET_NEXT_INDEX() \
572
            else \
573
                INC_INDEX; \
574
        } \
575
    } else \
576
        INC_INDEX;
577
578
579
#define APPLY_Y_PREDICTOR() \
580
    predictor_pair = s->y_predictor_table[index]; \
581
    horiz_pred += (predictor_pair >> 1); \
582
    if (predictor_pair & 1) { \
583
        GET_NEXT_INDEX() \
584
        if (!index) { \
585
            GET_NEXT_INDEX() \
586
            predictor_pair = s->y_predictor_table[index]; \
587
            horiz_pred += ((predictor_pair >> 1) * 5); \
588
            if (predictor_pair & 1) \
589
                GET_NEXT_INDEX() \
590
            else \
591
                INC_INDEX; \
592
        } \
593
    } else \
594
        INC_INDEX;
595
596
#define APPLY_Y_PREDICTOR_24() \
597
    predictor_pair = s->y_predictor_table[index]; \
598
    horiz_pred += (predictor_pair >> 1); \
599
    if (predictor_pair & 1) { \
600
        GET_NEXT_INDEX() \
601
        if (!index) { \
602
            GET_NEXT_INDEX() \
603
            predictor_pair = s->fat_y_predictor_table[index]; \
604
            horiz_pred += (predictor_pair >> 1); \
605
            if (predictor_pair & 1) \
606
                GET_NEXT_INDEX() \
607
            else \
608
                INC_INDEX; \
609
        } \
610
    } else \
611
        INC_INDEX;
612
613
#define OUTPUT_PIXEL_PAIR() \
614
    *current_pixel_pair = *vert_pred + horiz_pred; \
615
    *vert_pred++ = *current_pixel_pair++;
616
617
97
static void truemotion1_decode_16bit(TrueMotion1Context *s)
618
{
619
    int y;
620
    int pixels_left;  /* remaining pixels on this line */
621
    unsigned int predictor_pair;
622
    unsigned int horiz_pred;
623
    unsigned int *vert_pred;
624
    unsigned int *current_pixel_pair;
625
97
    unsigned char *current_line = s->frame->data[0];
626
97
    int keyframe = s->flags & FLAG_KEYFRAME;
627
628
    /* these variables are for managing the stream of macroblock change bits */
629
97
    const unsigned char *mb_change_bits = s->mb_change_bits;
630
    unsigned char mb_change_byte;
631
    unsigned char mb_change_byte_mask;
632
    int mb_change_index;
633
634
    /* these variables are for managing the main index stream */
635
97
    int index_stream_index = 0;  /* yes, the index into the index stream */
636
    int index;
637
638
    /* clean out the line buffer */
639
97
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
640
641
97
    GET_NEXT_INDEX();
642
643
16393
    for (y = 0; y < s->avctx->height; y++) {
644
645
        /* re-init variables for the next line iteration */
646
16296
        horiz_pred = 0;
647
16296
        current_pixel_pair = (unsigned int *)current_line;
648
16296
        vert_pred = s->vert_pred;
649
16296
        mb_change_index = 0;
650
16296
        if (!keyframe)
651
12600
            mb_change_byte = mb_change_bits[mb_change_index++];
652
16296
        mb_change_byte_mask = 0x01;
653
16296
        pixels_left = s->avctx->width;
654
655
1319976
        while (pixels_left > 0) {
656
657

1303680
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
658
659

706460
                switch (y & 3) {
660
176615
                case 0:
661
                    /* if macroblock width is 2, apply C-Y-C-Y; else
662
                     * apply C-Y-Y */
663
176615
                    if (s->block_width == 2) {
664
                        APPLY_C_PREDICTOR();
665
                        APPLY_Y_PREDICTOR();
666
                        OUTPUT_PIXEL_PAIR();
667
                        APPLY_C_PREDICTOR();
668
                        APPLY_Y_PREDICTOR();
669
                        OUTPUT_PIXEL_PAIR();
670
                    } else {
671




176615
                        APPLY_C_PREDICTOR();
672




176615
                        APPLY_Y_PREDICTOR();
673
176615
                        OUTPUT_PIXEL_PAIR();
674




176615
                        APPLY_Y_PREDICTOR();
675
176615
                        OUTPUT_PIXEL_PAIR();
676
                    }
677
176615
                    break;
678
679
353230
                case 1:
680
                case 3:
681
                    /* always apply 2 Y predictors on these iterations */
682




353230
                    APPLY_Y_PREDICTOR();
683
353230
                    OUTPUT_PIXEL_PAIR();
684




353230
                    APPLY_Y_PREDICTOR();
685
353230
                    OUTPUT_PIXEL_PAIR();
686
353230
                    break;
687
688
176615
                case 2:
689
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
690
                     * depending on the macroblock type */
691
176615
                    if (s->block_type == BLOCK_2x2) {
692
                        APPLY_C_PREDICTOR();
693
                        APPLY_Y_PREDICTOR();
694
                        OUTPUT_PIXEL_PAIR();
695
                        APPLY_C_PREDICTOR();
696
                        APPLY_Y_PREDICTOR();
697
                        OUTPUT_PIXEL_PAIR();
698
176615
                    } else if (s->block_type == BLOCK_4x2) {
699
                        APPLY_C_PREDICTOR();
700
                        APPLY_Y_PREDICTOR();
701
                        OUTPUT_PIXEL_PAIR();
702
                        APPLY_Y_PREDICTOR();
703
                        OUTPUT_PIXEL_PAIR();
704
                    } else {
705




176615
                        APPLY_Y_PREDICTOR();
706
176615
                        OUTPUT_PIXEL_PAIR();
707




176615
                        APPLY_Y_PREDICTOR();
708
176615
                        OUTPUT_PIXEL_PAIR();
709
                    }
710
176615
                    break;
711
                }
712
713
706460
            } else {
714
715
                /* skip (copy) four pixels, but reassign the horizontal
716
                 * predictor */
717
597220
                *vert_pred++ = *current_pixel_pair++;
718
597220
                horiz_pred = *current_pixel_pair - *vert_pred;
719
597220
                *vert_pred++ = *current_pixel_pair++;
720
721
            }
722
723
1303680
            if (!keyframe) {
724
1008000
                mb_change_byte_mask <<= 1;
725
726
                /* next byte */
727
1008000
                if (!mb_change_byte_mask) {
728
126000
                    mb_change_byte = mb_change_bits[mb_change_index++];
729
126000
                    mb_change_byte_mask = 0x01;
730
                }
731
            }
732
733
1303680
            pixels_left -= 4;
734
        }
735
736
        /* next change row */
737
16296
        if (((y + 1) & 3) == 0)
738
4074
            mb_change_bits += s->mb_change_bits_row_size;
739
740
16296
        current_line += s->frame->linesize[0];
741
    }
742
}
743
744
17
static void truemotion1_decode_24bit(TrueMotion1Context *s)
745
{
746
    int y;
747
    int pixels_left;  /* remaining pixels on this line */
748
    unsigned int predictor_pair;
749
    unsigned int horiz_pred;
750
    unsigned int *vert_pred;
751
    unsigned int *current_pixel_pair;
752
17
    unsigned char *current_line = s->frame->data[0];
753
17
    int keyframe = s->flags & FLAG_KEYFRAME;
754
755
    /* these variables are for managing the stream of macroblock change bits */
756
17
    const unsigned char *mb_change_bits = s->mb_change_bits;
757
    unsigned char mb_change_byte;
758
    unsigned char mb_change_byte_mask;
759
    int mb_change_index;
760
761
    /* these variables are for managing the main index stream */
762
17
    int index_stream_index = 0;  /* yes, the index into the index stream */
763
    int index;
764
765
    /* clean out the line buffer */
766
17
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
767
768
17
    GET_NEXT_INDEX();
769
770
2707
    for (y = 0; y < s->avctx->height; y++) {
771
772
        /* re-init variables for the next line iteration */
773
2691
        horiz_pred = 0;
774
2691
        current_pixel_pair = (unsigned int *)current_line;
775
2691
        vert_pred = s->vert_pred;
776
2691
        mb_change_index = 0;
777
2691
        mb_change_byte = mb_change_bits[mb_change_index++];
778
2691
        mb_change_byte_mask = 0x01;
779
2691
        pixels_left = s->avctx->width;
780
781
196395
        while (pixels_left > 0) {
782
783

193705
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
784
785

153710
                switch (y & 3) {
786
38453
                case 0:
787
                    /* if macroblock width is 2, apply C-Y-C-Y; else
788
                     * apply C-Y-Y */
789
38453
                    if (s->block_width == 2) {
790




38453
                        APPLY_C_PREDICTOR_24();
791




38453
                        APPLY_Y_PREDICTOR_24();
792
38453
                        OUTPUT_PIXEL_PAIR();
793




38453
                        APPLY_C_PREDICTOR_24();
794




38453
                        APPLY_Y_PREDICTOR_24();
795
38453
                        OUTPUT_PIXEL_PAIR();
796
                    } else {
797
                        APPLY_C_PREDICTOR_24();
798
                        APPLY_Y_PREDICTOR_24();
799
                        OUTPUT_PIXEL_PAIR();
800
                        APPLY_Y_PREDICTOR_24();
801
                        OUTPUT_PIXEL_PAIR();
802
                    }
803
38453
                    break;
804
805
76846
                case 1:
806
                case 3:
807
                    /* always apply 2 Y predictors on these iterations */
808




76846
                    APPLY_Y_PREDICTOR_24();
809
76846
                    OUTPUT_PIXEL_PAIR();
810




76846
                    APPLY_Y_PREDICTOR_24();
811
76846
                    OUTPUT_PIXEL_PAIR();
812
76846
                    break;
813
814
38411
                case 2:
815
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
816
                     * depending on the macroblock type */
817
38411
                    if (s->block_type == BLOCK_2x2) {
818




38411
                        APPLY_C_PREDICTOR_24();
819




38411
                        APPLY_Y_PREDICTOR_24();
820
38411
                        OUTPUT_PIXEL_PAIR();
821




38411
                        APPLY_C_PREDICTOR_24();
822




38411
                        APPLY_Y_PREDICTOR_24();
823
38410
                        OUTPUT_PIXEL_PAIR();
824
                    } else if (s->block_type == BLOCK_4x2) {
825
                        APPLY_C_PREDICTOR_24();
826
                        APPLY_Y_PREDICTOR_24();
827
                        OUTPUT_PIXEL_PAIR();
828
                        APPLY_Y_PREDICTOR_24();
829
                        OUTPUT_PIXEL_PAIR();
830
                    } else {
831
                        APPLY_Y_PREDICTOR_24();
832
                        OUTPUT_PIXEL_PAIR();
833
                        APPLY_Y_PREDICTOR_24();
834
                        OUTPUT_PIXEL_PAIR();
835
                    }
836
38410
                    break;
837
                }
838
839
153709
            } else {
840
841
                /* skip (copy) four pixels, but reassign the horizontal
842
                 * predictor */
843
39995
                *vert_pred++ = *current_pixel_pair++;
844
39995
                horiz_pred = *current_pixel_pair - *vert_pred;
845
39995
                *vert_pred++ = *current_pixel_pair++;
846
847
            }
848
849
193704
            if (!keyframe) {
850
159144
                mb_change_byte_mask <<= 1;
851
852
                /* next byte */
853
159144
                if (!mb_change_byte_mask) {
854
19893
                    mb_change_byte = mb_change_bits[mb_change_index++];
855
19893
                    mb_change_byte_mask = 0x01;
856
                }
857
            }
858
859
193704
            pixels_left -= 2;
860
        }
861
862
        /* next change row */
863
2690
        if (((y + 1) & 3) == 0)
864
672
            mb_change_bits += s->mb_change_bits_row_size;
865
866
2690
        current_line += s->frame->linesize[0];
867
    }
868
}
869
870
871
123
static int truemotion1_decode_frame(AVCodecContext *avctx,
872
                                    void *data, int *got_frame,
873
                                    AVPacket *avpkt)
874
{
875
123
    const uint8_t *buf = avpkt->data;
876
123
    int ret, buf_size = avpkt->size;
877
123
    TrueMotion1Context *s = avctx->priv_data;
878
879
123
    s->buf = buf;
880
123
    s->size = buf_size;
881
882
123
    if ((ret = truemotion1_decode_header(s)) < 0)
883
        return ret;
884
885
123
    if ((ret = ff_reget_buffer(avctx, s->frame, 0)) < 0)
886
        return ret;
887
888
123
    if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
889
17
        truemotion1_decode_24bit(s);
890
106
    } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
891
97
        truemotion1_decode_16bit(s);
892
    }
893
894
123
    if ((ret = av_frame_ref(data, s->frame)) < 0)
895
        return ret;
896
897
123
    *got_frame      = 1;
898
899
    /* report that the buffer was completely consumed */
900
123
    return buf_size;
901
}
902
903
4
static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
904
{
905
4
    TrueMotion1Context *s = avctx->priv_data;
906
907
4
    av_frame_free(&s->frame);
908
4
    av_freep(&s->vert_pred);
909
910
4
    return 0;
911
}
912
913
AVCodec ff_truemotion1_decoder = {
914
    .name           = "truemotion1",
915
    .long_name      = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
916
    .type           = AVMEDIA_TYPE_VIDEO,
917
    .id             = AV_CODEC_ID_TRUEMOTION1,
918
    .priv_data_size = sizeof(TrueMotion1Context),
919
    .init           = truemotion1_decode_init,
920
    .close          = truemotion1_decode_end,
921
    .decode         = truemotion1_decode_frame,
922
    .capabilities   = AV_CODEC_CAP_DR1,
923
    .caps_internal  = FF_CODEC_CAP_INIT_CLEANUP,
924
};