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1
/*
2
 * Duck TrueMotion 1.0 Decoder
3
 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
4
 *
5
 * This file is part of FFmpeg.
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 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * 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.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with FFmpeg; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
21

    
22
/**
23
 * @file libavcodec/truemotion1.c
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 * Duck TrueMotion v1 Video Decoder by
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 * Alex Beregszaszi and
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 * Mike Melanson (melanson@pcisys.net)
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 *
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 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
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 * 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 "dsputil.h"
38

    
39
#include "truemotion1data.h"
40

    
41
typedef struct TrueMotion1Context {
42
    AVCodecContext *avctx;
43
    AVFrame frame;
44

    
45
    const uint8_t *buf;
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    int size;
47

    
48
    const uint8_t *mb_change_bits;
49
    int mb_change_bits_row_size;
50
    const uint8_t *index_stream;
51
    int index_stream_size;
52

    
53
    int flags;
54
    int x, y, w, h;
55

    
56
    uint32_t y_predictor_table[1024];
57
    uint32_t c_predictor_table[1024];
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    uint32_t fat_y_predictor_table[1024];
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    uint32_t fat_c_predictor_table[1024];
60

    
61
    int compression;
62
    int block_type;
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    int block_width;
64
    int block_height;
65

    
66
    int16_t ydt[8];
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    int16_t cdt[8];
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    int16_t fat_ydt[8];
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    int16_t fat_cdt[8];
70

    
71
    int last_deltaset, last_vectable;
72

    
73
    unsigned int *vert_pred;
74

    
75
} TrueMotion1Context;
76

    
77
#define FLAG_SPRITE         32
78
#define FLAG_KEYFRAME       16
79
#define FLAG_INTERFRAME      8
80
#define FLAG_INTERPOLATED    4
81

    
82
struct frame_header {
83
    uint8_t header_size;
84
    uint8_t compression;
85
    uint8_t deltaset;
86
    uint8_t vectable;
87
    uint16_t ysize;
88
    uint16_t xsize;
89
    uint16_t checksum;
90
    uint8_t version;
91
    uint8_t header_type;
92
    uint8_t flags;
93
    uint8_t control;
94
    uint16_t xoffset;
95
    uint16_t yoffset;
96
    uint16_t width;
97
    uint16_t height;
98
};
99

    
100
#define ALGO_NOP        0
101
#define ALGO_RGB16V     1
102
#define ALGO_RGB16H     2
103
#define ALGO_RGB24H     3
104

    
105
/* these are the various block sizes that can occupy a 4x4 block */
106
#define BLOCK_2x2  0
107
#define BLOCK_2x4  1
108
#define BLOCK_4x2  2
109
#define BLOCK_4x4  3
110

    
111
typedef struct comp_types {
112
    int algorithm;
113
    int block_width; // vres
114
    int block_height; // hres
115
    int block_type;
116
} comp_types;
117

    
118
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
119
static const comp_types compression_types[17] = {
120
    { ALGO_NOP,    0, 0, 0 },
121

    
122
    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
123
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
124
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
125
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
126

    
127
    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
128
    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
129
    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
130
    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
131

    
132
    { ALGO_NOP,    4, 4, BLOCK_4x4 },
133
    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
134
    { ALGO_NOP,    4, 2, BLOCK_4x2 },
135
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
136

    
137
    { ALGO_NOP,    2, 4, BLOCK_2x4 },
138
    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
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    { ALGO_NOP,    2, 2, BLOCK_2x2 },
140
    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
141
};
142

    
143
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
144
{
145
    int i;
146

    
147
    if (delta_table_index > 3)
148
        return;
149

    
150
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
151
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
152
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
153
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
154

    
155
    /* Y skinny deltas need to be halved for some reason; maybe the
156
     * skinny Y deltas should be modified */
157
    for (i = 0; i < 8; i++)
158
    {
159
        /* drop the lsb before dividing by 2-- net effect: round down
160
         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
161
        s->ydt[i] &= 0xFFFE;
162
        s->ydt[i] /= 2;
163
    }
164
}
165

    
166
#if HAVE_BIGENDIAN
167
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
168
#else
169
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
170
#endif
171
{
172
    int lo, hi;
173

    
174
    lo = ydt[p1];
175
    lo += (lo << 5) + (lo << 10);
176
    hi = ydt[p2];
177
    hi += (hi << 5) + (hi << 10);
178
    return (lo + (hi << 16)) << 1;
179
}
180

    
181
#if HAVE_BIGENDIAN
182
static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
183
#else
184
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
185
#endif
186
{
187
    int r, b, lo;
188

    
189
    b = cdt[p2];
190
    r = cdt[p1] << 10;
191
    lo = b + r;
192
    return (lo + (lo << 16)) << 1;
193
}
194

    
195
#if HAVE_BIGENDIAN
196
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
197
#else
198
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
199
#endif
200
{
201
    int lo, hi;
202

    
203
    lo = ydt[p1];
204
    lo += (lo << 6) + (lo << 11);
205
    hi = ydt[p2];
206
    hi += (hi << 6) + (hi << 11);
207
    return (lo + (hi << 16)) << 1;
208
}
209

    
210
#if HAVE_BIGENDIAN
211
static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
212
#else
213
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
214
#endif
215
{
216
    int r, b, lo;
217

    
218
    b = cdt[p2];
219
    r = cdt[p1] << 11;
220
    lo = b + r;
221
    return (lo + (lo << 16)) << 1;
222
}
223

    
224
#if HAVE_BIGENDIAN
225
static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
226
#else
227
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
228
#endif
229
{
230
    int lo, hi;
231

    
232
    lo = ydt[p1];
233
    hi = ydt[p2];
234
    return (lo + (hi << 8) + (hi << 16)) << 1;
235
}
236

    
237
#if HAVE_BIGENDIAN
238
static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
239
#else
240
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
241
#endif
242
{
243
    int r, b;
244

    
245
    b = cdt[p2];
246
    r = cdt[p1]<<16;
247
    return (b+r) << 1;
248
}
249

    
250
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
251
{
252
    int len, i, j;
253
    unsigned char delta_pair;
254

    
255
    for (i = 0; i < 1024; i += 4)
256
    {
257
        len = *sel_vector_table++ / 2;
258
        for (j = 0; j < len; j++)
259
        {
260
            delta_pair = *sel_vector_table++;
261
            s->y_predictor_table[i+j] = 0xfffffffe &
262
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
263
            s->c_predictor_table[i+j] = 0xfffffffe &
264
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
265
        }
266
        s->y_predictor_table[i+(j-1)] |= 1;
267
        s->c_predictor_table[i+(j-1)] |= 1;
268
    }
269
}
270

    
271
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
272
{
273
    int len, i, j;
274
    unsigned char delta_pair;
275

    
276
    for (i = 0; i < 1024; i += 4)
277
    {
278
        len = *sel_vector_table++ / 2;
279
        for (j = 0; j < len; j++)
280
        {
281
            delta_pair = *sel_vector_table++;
282
            s->y_predictor_table[i+j] = 0xfffffffe &
283
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
284
            s->c_predictor_table[i+j] = 0xfffffffe &
285
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
286
        }
287
        s->y_predictor_table[i+(j-1)] |= 1;
288
        s->c_predictor_table[i+(j-1)] |= 1;
289
    }
290
}
291

    
292
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
293
{
294
    int len, i, j;
295
    unsigned char delta_pair;
296

    
297
    for (i = 0; i < 1024; i += 4)
298
    {
299
        len = *sel_vector_table++ / 2;
300
        for (j = 0; j < len; j++)
301
        {
302
            delta_pair = *sel_vector_table++;
303
            s->y_predictor_table[i+j] = 0xfffffffe &
304
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
305
            s->c_predictor_table[i+j] = 0xfffffffe &
306
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
307
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
308
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
309
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
310
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
311
        }
312
        s->y_predictor_table[i+(j-1)] |= 1;
313
        s->c_predictor_table[i+(j-1)] |= 1;
314
        s->fat_y_predictor_table[i+(j-1)] |= 1;
315
        s->fat_c_predictor_table[i+(j-1)] |= 1;
316
    }
317
}
318

    
319
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
320
 * there was an error while decoding the header */
321
static int truemotion1_decode_header(TrueMotion1Context *s)
322
{
323
    int i;
324
    struct frame_header header;
325
    uint8_t header_buffer[128];  /* logical maximum size of the header */
326
    const uint8_t *sel_vector_table;
327

    
328
    /* There is 1 change bit per 4 pixels, so each change byte represents
329
     * 32 pixels; divide width by 4 to obtain the number of change bits and
330
     * then round up to the nearest byte. */
331
    s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
332

    
333
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
334
    if (s->buf[0] < 0x10)
335
    {
336
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
337
        return -1;
338
    }
339

    
340
    /* unscramble the header bytes with a XOR operation */
341
    memset(header_buffer, 0, 128);
342
    for (i = 1; i < header.header_size; i++)
343
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
344

    
345
    header.compression = header_buffer[0];
346
    header.deltaset = header_buffer[1];
347
    header.vectable = header_buffer[2];
348
    header.ysize = AV_RL16(&header_buffer[3]);
349
    header.xsize = AV_RL16(&header_buffer[5]);
350
    header.checksum = AV_RL16(&header_buffer[7]);
351
    header.version = header_buffer[9];
352
    header.header_type = header_buffer[10];
353
    header.flags = header_buffer[11];
354
    header.control = header_buffer[12];
355

    
356
    /* Version 2 */
357
    if (header.version >= 2)
358
    {
359
        if (header.header_type > 3)
360
        {
361
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
362
            return -1;
363
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
364
            s->flags = header.flags;
365
            if (!(s->flags & FLAG_INTERFRAME))
366
                s->flags |= FLAG_KEYFRAME;
367
        } else
368
            s->flags = FLAG_KEYFRAME;
369
    } else /* Version 1 */
370
        s->flags = FLAG_KEYFRAME;
371

    
372
    if (s->flags & FLAG_SPRITE) {
373
        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
374
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
375
#if 0
376
        s->w = header.width;
377
        s->h = header.height;
378
        s->x = header.xoffset;
379
        s->y = header.yoffset;
380
#else
381
        return -1;
382
#endif
383
    } else {
384
        s->w = header.xsize;
385
        s->h = header.ysize;
386
        if (header.header_type < 2) {
387
            if ((s->w < 213) && (s->h >= 176))
388
            {
389
                s->flags |= FLAG_INTERPOLATED;
390
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
391
            }
392
        }
393
    }
394

    
395
    if (header.compression >= 17) {
396
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
397
        return -1;
398
    }
399

    
400
    if ((header.deltaset != s->last_deltaset) ||
401
        (header.vectable != s->last_vectable))
402
        select_delta_tables(s, header.deltaset);
403

    
404
    if ((header.compression & 1) && header.header_type)
405
        sel_vector_table = pc_tbl2;
406
    else {
407
        if (header.vectable < 4)
408
            sel_vector_table = tables[header.vectable - 1];
409
        else {
410
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
411
            return -1;
412
        }
413
    }
414

    
415
    // FIXME: where to place this ?!?!
416
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
417
        s->avctx->pix_fmt = PIX_FMT_RGB32;
418
    else
419
        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
420

    
421
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
422
    {
423
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
424
            gen_vector_table24(s, sel_vector_table);
425
        else
426
        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
427
            gen_vector_table15(s, sel_vector_table);
428
        else
429
            gen_vector_table16(s, sel_vector_table);
430
    }
431

    
432
    /* set up pointers to the other key data chunks */
433
    s->mb_change_bits = s->buf + header.header_size;
434
    if (s->flags & FLAG_KEYFRAME) {
435
        /* no change bits specified for a keyframe; only index bytes */
436
        s->index_stream = s->mb_change_bits;
437
    } else {
438
        /* one change bit per 4x4 block */
439
        s->index_stream = s->mb_change_bits +
440
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
441
    }
442
    s->index_stream_size = s->size - (s->index_stream - s->buf);
443

    
444
    s->last_deltaset = header.deltaset;
445
    s->last_vectable = header.vectable;
446
    s->compression = header.compression;
447
    s->block_width = compression_types[header.compression].block_width;
448
    s->block_height = compression_types[header.compression].block_height;
449
    s->block_type = compression_types[header.compression].block_type;
450

    
451
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
452
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
453
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
454
            s->block_height, s->block_type,
455
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
456
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
457
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
458
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
459

    
460
    return header.header_size;
461
}
462

    
463
static av_cold int truemotion1_decode_init(AVCodecContext *avctx)
464
{
465
    TrueMotion1Context *s = avctx->priv_data;
466

    
467
    s->avctx = avctx;
468

    
469
    // FIXME: it may change ?
470
//    if (avctx->bits_per_sample == 24)
471
//        avctx->pix_fmt = PIX_FMT_RGB24;
472
//    else
473
//        avctx->pix_fmt = PIX_FMT_RGB555;
474

    
475
    s->frame.data[0] = NULL;
476

    
477
    /* there is a vertical predictor for each pixel in a line; each vertical
478
     * predictor is 0 to start with */
479
    s->vert_pred =
480
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
481

    
482
    return 0;
483
}
484

    
485
/*
486
Block decoding order:
487

488
dxi: Y-Y
489
dxic: Y-C-Y
490
dxic2: Y-C-Y-C
491

492
hres,vres,i,i%vres (0 < i < 4)
493
2x2 0: 0 dxic2
494
2x2 1: 1 dxi
495
2x2 2: 0 dxic2
496
2x2 3: 1 dxi
497
2x4 0: 0 dxic2
498
2x4 1: 1 dxi
499
2x4 2: 2 dxi
500
2x4 3: 3 dxi
501
4x2 0: 0 dxic
502
4x2 1: 1 dxi
503
4x2 2: 0 dxic
504
4x2 3: 1 dxi
505
4x4 0: 0 dxic
506
4x4 1: 1 dxi
507
4x4 2: 2 dxi
508
4x4 3: 3 dxi
509
*/
510

    
511
#define GET_NEXT_INDEX() \
512
{\
513
    if (index_stream_index >= s->index_stream_size) { \
514
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
515
        return; \
516
    } \
517
    index = s->index_stream[index_stream_index++] * 4; \
518
}
519

    
520
#define APPLY_C_PREDICTOR() \
521
    predictor_pair = s->c_predictor_table[index]; \
522
    horiz_pred += (predictor_pair >> 1); \
523
    if (predictor_pair & 1) { \
524
        GET_NEXT_INDEX() \
525
        if (!index) { \
526
            GET_NEXT_INDEX() \
527
            predictor_pair = s->c_predictor_table[index]; \
528
            horiz_pred += ((predictor_pair >> 1) * 5); \
529
            if (predictor_pair & 1) \
530
                GET_NEXT_INDEX() \
531
            else \
532
                index++; \
533
        } \
534
    } else \
535
        index++;
536

    
537
#define APPLY_C_PREDICTOR_24() \
538
    predictor_pair = s->c_predictor_table[index]; \
539
    horiz_pred += (predictor_pair >> 1); \
540
    if (predictor_pair & 1) { \
541
        GET_NEXT_INDEX() \
542
        if (!index) { \
543
            GET_NEXT_INDEX() \
544
            predictor_pair = s->fat_c_predictor_table[index]; \
545
            horiz_pred += (predictor_pair >> 1); \
546
            if (predictor_pair & 1) \
547
                GET_NEXT_INDEX() \
548
            else \
549
                index++; \
550
        } \
551
    } else \
552
        index++;
553

    
554

    
555
#define APPLY_Y_PREDICTOR() \
556
    predictor_pair = s->y_predictor_table[index]; \
557
    horiz_pred += (predictor_pair >> 1); \
558
    if (predictor_pair & 1) { \
559
        GET_NEXT_INDEX() \
560
        if (!index) { \
561
            GET_NEXT_INDEX() \
562
            predictor_pair = s->y_predictor_table[index]; \
563
            horiz_pred += ((predictor_pair >> 1) * 5); \
564
            if (predictor_pair & 1) \
565
                GET_NEXT_INDEX() \
566
            else \
567
                index++; \
568
        } \
569
    } else \
570
        index++;
571

    
572
#define APPLY_Y_PREDICTOR_24() \
573
    predictor_pair = s->y_predictor_table[index]; \
574
    horiz_pred += (predictor_pair >> 1); \
575
    if (predictor_pair & 1) { \
576
        GET_NEXT_INDEX() \
577
        if (!index) { \
578
            GET_NEXT_INDEX() \
579
            predictor_pair = s->fat_y_predictor_table[index]; \
580
            horiz_pred += (predictor_pair >> 1); \
581
            if (predictor_pair & 1) \
582
                GET_NEXT_INDEX() \
583
            else \
584
                index++; \
585
        } \
586
    } else \
587
        index++;
588

    
589
#define OUTPUT_PIXEL_PAIR() \
590
    *current_pixel_pair = *vert_pred + horiz_pred; \
591
    *vert_pred++ = *current_pixel_pair++;
592

    
593
static void truemotion1_decode_16bit(TrueMotion1Context *s)
594
{
595
    int y;
596
    int pixels_left;  /* remaining pixels on this line */
597
    unsigned int predictor_pair;
598
    unsigned int horiz_pred;
599
    unsigned int *vert_pred;
600
    unsigned int *current_pixel_pair;
601
    unsigned char *current_line = s->frame.data[0];
602
    int keyframe = s->flags & FLAG_KEYFRAME;
603

    
604
    /* these variables are for managing the stream of macroblock change bits */
605
    const unsigned char *mb_change_bits = s->mb_change_bits;
606
    unsigned char mb_change_byte;
607
    unsigned char mb_change_byte_mask;
608
    int mb_change_index;
609

    
610
    /* these variables are for managing the main index stream */
611
    int index_stream_index = 0;  /* yes, the index into the index stream */
612
    int index;
613

    
614
    /* clean out the line buffer */
615
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
616

    
617
    GET_NEXT_INDEX();
618

    
619
    for (y = 0; y < s->avctx->height; y++) {
620

    
621
        /* re-init variables for the next line iteration */
622
        horiz_pred = 0;
623
        current_pixel_pair = (unsigned int *)current_line;
624
        vert_pred = s->vert_pred;
625
        mb_change_index = 0;
626
        mb_change_byte = mb_change_bits[mb_change_index++];
627
        mb_change_byte_mask = 0x01;
628
        pixels_left = s->avctx->width;
629

    
630
        while (pixels_left > 0) {
631

    
632
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
633

    
634
                switch (y & 3) {
635
                case 0:
636
                    /* if macroblock width is 2, apply C-Y-C-Y; else
637
                     * apply C-Y-Y */
638
                    if (s->block_width == 2) {
639
                        APPLY_C_PREDICTOR();
640
                        APPLY_Y_PREDICTOR();
641
                        OUTPUT_PIXEL_PAIR();
642
                        APPLY_C_PREDICTOR();
643
                        APPLY_Y_PREDICTOR();
644
                        OUTPUT_PIXEL_PAIR();
645
                    } else {
646
                        APPLY_C_PREDICTOR();
647
                        APPLY_Y_PREDICTOR();
648
                        OUTPUT_PIXEL_PAIR();
649
                        APPLY_Y_PREDICTOR();
650
                        OUTPUT_PIXEL_PAIR();
651
                    }
652
                    break;
653

    
654
                case 1:
655
                case 3:
656
                    /* always apply 2 Y predictors on these iterations */
657
                    APPLY_Y_PREDICTOR();
658
                    OUTPUT_PIXEL_PAIR();
659
                    APPLY_Y_PREDICTOR();
660
                    OUTPUT_PIXEL_PAIR();
661
                    break;
662

    
663
                case 2:
664
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
665
                     * depending on the macroblock type */
666
                    if (s->block_type == BLOCK_2x2) {
667
                        APPLY_C_PREDICTOR();
668
                        APPLY_Y_PREDICTOR();
669
                        OUTPUT_PIXEL_PAIR();
670
                        APPLY_C_PREDICTOR();
671
                        APPLY_Y_PREDICTOR();
672
                        OUTPUT_PIXEL_PAIR();
673
                    } else if (s->block_type == BLOCK_4x2) {
674
                        APPLY_C_PREDICTOR();
675
                        APPLY_Y_PREDICTOR();
676
                        OUTPUT_PIXEL_PAIR();
677
                        APPLY_Y_PREDICTOR();
678
                        OUTPUT_PIXEL_PAIR();
679
                    } else {
680
                        APPLY_Y_PREDICTOR();
681
                        OUTPUT_PIXEL_PAIR();
682
                        APPLY_Y_PREDICTOR();
683
                        OUTPUT_PIXEL_PAIR();
684
                    }
685
                    break;
686
                }
687

    
688
            } else {
689

    
690
                /* skip (copy) four pixels, but reassign the horizontal
691
                 * predictor */
692
                *vert_pred++ = *current_pixel_pair++;
693
                horiz_pred = *current_pixel_pair - *vert_pred;
694
                *vert_pred++ = *current_pixel_pair++;
695

    
696
            }
697

    
698
            if (!keyframe) {
699
                mb_change_byte_mask <<= 1;
700

    
701
                /* next byte */
702
                if (!mb_change_byte_mask) {
703
                    mb_change_byte = mb_change_bits[mb_change_index++];
704
                    mb_change_byte_mask = 0x01;
705
                }
706
            }
707

    
708
            pixels_left -= 4;
709
        }
710

    
711
        /* next change row */
712
        if (((y + 1) & 3) == 0)
713
            mb_change_bits += s->mb_change_bits_row_size;
714

    
715
        current_line += s->frame.linesize[0];
716
    }
717
}
718

    
719
static void truemotion1_decode_24bit(TrueMotion1Context *s)
720
{
721
    int y;
722
    int pixels_left;  /* remaining pixels on this line */
723
    unsigned int predictor_pair;
724
    unsigned int horiz_pred;
725
    unsigned int *vert_pred;
726
    unsigned int *current_pixel_pair;
727
    unsigned char *current_line = s->frame.data[0];
728
    int keyframe = s->flags & FLAG_KEYFRAME;
729

    
730
    /* these variables are for managing the stream of macroblock change bits */
731
    const unsigned char *mb_change_bits = s->mb_change_bits;
732
    unsigned char mb_change_byte;
733
    unsigned char mb_change_byte_mask;
734
    int mb_change_index;
735

    
736
    /* these variables are for managing the main index stream */
737
    int index_stream_index = 0;  /* yes, the index into the index stream */
738
    int index;
739

    
740
    /* clean out the line buffer */
741
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
742

    
743
    GET_NEXT_INDEX();
744

    
745
    for (y = 0; y < s->avctx->height; y++) {
746

    
747
        /* re-init variables for the next line iteration */
748
        horiz_pred = 0;
749
        current_pixel_pair = (unsigned int *)current_line;
750
        vert_pred = s->vert_pred;
751
        mb_change_index = 0;
752
        mb_change_byte = mb_change_bits[mb_change_index++];
753
        mb_change_byte_mask = 0x01;
754
        pixels_left = s->avctx->width;
755

    
756
        while (pixels_left > 0) {
757

    
758
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
759

    
760
                switch (y & 3) {
761
                case 0:
762
                    /* if macroblock width is 2, apply C-Y-C-Y; else
763
                     * apply C-Y-Y */
764
                    if (s->block_width == 2) {
765
                        APPLY_C_PREDICTOR_24();
766
                        APPLY_Y_PREDICTOR_24();
767
                        OUTPUT_PIXEL_PAIR();
768
                        APPLY_C_PREDICTOR_24();
769
                        APPLY_Y_PREDICTOR_24();
770
                        OUTPUT_PIXEL_PAIR();
771
                    } else {
772
                        APPLY_C_PREDICTOR_24();
773
                        APPLY_Y_PREDICTOR_24();
774
                        OUTPUT_PIXEL_PAIR();
775
                        APPLY_Y_PREDICTOR_24();
776
                        OUTPUT_PIXEL_PAIR();
777
                    }
778
                    break;
779

    
780
                case 1:
781
                case 3:
782
                    /* always apply 2 Y predictors on these iterations */
783
                    APPLY_Y_PREDICTOR_24();
784
                    OUTPUT_PIXEL_PAIR();
785
                    APPLY_Y_PREDICTOR_24();
786
                    OUTPUT_PIXEL_PAIR();
787
                    break;
788

    
789
                case 2:
790
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
791
                     * depending on the macroblock type */
792
                    if (s->block_type == BLOCK_2x2) {
793
                        APPLY_C_PREDICTOR_24();
794
                        APPLY_Y_PREDICTOR_24();
795
                        OUTPUT_PIXEL_PAIR();
796
                        APPLY_C_PREDICTOR_24();
797
                        APPLY_Y_PREDICTOR_24();
798
                        OUTPUT_PIXEL_PAIR();
799
                    } else if (s->block_type == BLOCK_4x2) {
800
                        APPLY_C_PREDICTOR_24();
801
                        APPLY_Y_PREDICTOR_24();
802
                        OUTPUT_PIXEL_PAIR();
803
                        APPLY_Y_PREDICTOR_24();
804
                        OUTPUT_PIXEL_PAIR();
805
                    } else {
806
                        APPLY_Y_PREDICTOR_24();
807
                        OUTPUT_PIXEL_PAIR();
808
                        APPLY_Y_PREDICTOR_24();
809
                        OUTPUT_PIXEL_PAIR();
810
                    }
811
                    break;
812
                }
813

    
814
            } else {
815

    
816
                /* skip (copy) four pixels, but reassign the horizontal
817
                 * predictor */
818
                *vert_pred++ = *current_pixel_pair++;
819
                horiz_pred = *current_pixel_pair - *vert_pred;
820
                *vert_pred++ = *current_pixel_pair++;
821

    
822
            }
823

    
824
            if (!keyframe) {
825
                mb_change_byte_mask <<= 1;
826

    
827
                /* next byte */
828
                if (!mb_change_byte_mask) {
829
                    mb_change_byte = mb_change_bits[mb_change_index++];
830
                    mb_change_byte_mask = 0x01;
831
                }
832
            }
833

    
834
            pixels_left -= 4;
835
        }
836

    
837
        /* next change row */
838
        if (((y + 1) & 3) == 0)
839
            mb_change_bits += s->mb_change_bits_row_size;
840

    
841
        current_line += s->frame.linesize[0];
842
    }
843
}
844

    
845

    
846
static int truemotion1_decode_frame(AVCodecContext *avctx,
847
                                    void *data, int *data_size,
848
                                    AVPacket *avpkt)
849
{
850
    const uint8_t *buf = avpkt->data;
851
    int buf_size = avpkt->size;
852
    TrueMotion1Context *s = avctx->priv_data;
853

    
854
    s->buf = buf;
855
    s->size = buf_size;
856

    
857
    if (truemotion1_decode_header(s) == -1)
858
        return -1;
859

    
860
    s->frame.reference = 1;
861
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
862
        FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
863
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
864
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
865
        return -1;
866
    }
867

    
868
    if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
869
        truemotion1_decode_24bit(s);
870
    } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
871
        truemotion1_decode_16bit(s);
872
    }
873

    
874
    *data_size = sizeof(AVFrame);
875
    *(AVFrame*)data = s->frame;
876

    
877
    /* report that the buffer was completely consumed */
878
    return buf_size;
879
}
880

    
881
static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
882
{
883
    TrueMotion1Context *s = avctx->priv_data;
884

    
885
    if (s->frame.data[0])
886
        avctx->release_buffer(avctx, &s->frame);
887

    
888
    av_free(s->vert_pred);
889

    
890
    return 0;
891
}
892

    
893
AVCodec truemotion1_decoder = {
894
    "truemotion1",
895
    CODEC_TYPE_VIDEO,
896
    CODEC_ID_TRUEMOTION1,
897
    sizeof(TrueMotion1Context),
898
    truemotion1_decode_init,
899
    NULL,
900
    truemotion1_decode_end,
901
    truemotion1_decode_frame,
902
    CODEC_CAP_DR1,
903
    .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
904
};