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1
/*
2
 * Duck TrueMotion 1.0 Decoder
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 * 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
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 * 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 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
#include <unistd.h>
36

    
37
#include "avcodec.h"
38
#include "dsputil.h"
39

    
40
#include "truemotion1data.h"
41

    
42
typedef struct TrueMotion1Context {
43
    AVCodecContext *avctx;
44
    AVFrame frame;
45
    AVFrame prev_frame;
46

    
47
    uint8_t *buf;
48
    int size;
49

    
50
    uint8_t *mb_change_bits;
51
    int mb_change_bits_row_size;
52
    uint8_t *index_stream;
53
    int index_stream_size;
54

    
55
    int flags;
56
    int x, y, w, h;
57

    
58
    uint32_t y_predictor_table[1024];
59
    uint32_t c_predictor_table[1024];
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    uint32_t fat_y_predictor_table[1024];
61
    uint32_t fat_c_predictor_table[1024];
62

    
63
    int compression;
64
    int block_type;
65
    int block_width;
66
    int block_height;
67

    
68
    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];
72

    
73
    int last_deltaset, last_vectable;
74

    
75
    unsigned int *vert_pred;
76

    
77
} TrueMotion1Context;
78

    
79
#define FLAG_SPRITE         32
80
#define FLAG_KEYFRAME       16
81
#define FLAG_INTERFRAME      8
82
#define FLAG_INTERPOLATED    4
83

    
84
struct frame_header {
85
    uint8_t header_size;
86
    uint8_t compression;
87
    uint8_t deltaset;
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    uint8_t vectable;
89
    uint16_t ysize;
90
    uint16_t xsize;
91
    uint16_t checksum;
92
    uint8_t version;
93
    uint8_t header_type;
94
    uint8_t flags;
95
    uint8_t control;
96
    uint16_t xoffset;
97
    uint16_t yoffset;
98
    uint16_t width;
99
    uint16_t height;
100
};
101

    
102
#define ALGO_NOP        0
103
#define ALGO_RGB16V     1
104
#define ALGO_RGB16H     2
105
#define ALGO_RGB24H     3
106

    
107
/* these are the various block sizes that can occupy a 4x4 block */
108
#define BLOCK_2x2  0
109
#define BLOCK_2x4  1
110
#define BLOCK_4x2  2
111
#define BLOCK_4x4  3
112

    
113
typedef struct comp_types {
114
    int algorithm;
115
    int block_width; // vres
116
    int block_height; // hres
117
    int block_type;
118
} comp_types;
119

    
120
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
121
static comp_types compression_types[17] = {
122
    { ALGO_NOP,    0, 0, 0 },
123

    
124
    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
125
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
126
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
127
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
128

    
129
    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
130
    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
131
    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
132
    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
133

    
134
    { ALGO_NOP,    4, 4, BLOCK_4x4 },
135
    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
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    { ALGO_NOP,    4, 2, BLOCK_4x2 },
137
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
138

    
139
    { ALGO_NOP,    2, 4, BLOCK_2x4 },
140
    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
141
    { ALGO_NOP,    2, 2, BLOCK_2x2 },
142
    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
143
};
144

    
145
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
146
{
147
    int i;
148

    
149
    if (delta_table_index > 3)
150
        return;
151

    
152
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
153
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
154
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
155
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
156

    
157
    /* Y skinny deltas need to be halved for some reason; maybe the
158
     * skinny Y deltas should be modified */
159
    for (i = 0; i < 8; i++)
160
    {
161
        /* drop the lsb before dividing by 2-- net effect: round down
162
         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
163
        s->ydt[i] &= 0xFFFE;
164
        s->ydt[i] /= 2;
165
    }
166
}
167

    
168
#ifdef WORDS_BIGENDIAN
169
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
170
#else
171
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
172
#endif
173
{
174
    int lo, hi;
175

    
176
    lo = ydt[p1];
177
    lo += (lo << 5) + (lo << 10);
178
    hi = ydt[p2];
179
    hi += (hi << 5) + (hi << 10);
180
    return ((lo + (hi << 16)) << 1);
181
}
182

    
183
#ifdef WORDS_BIGENDIAN
184
static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
185
#else
186
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
187
#endif
188
{
189
    int r, b, lo;
190

    
191
    b = cdt[p2];
192
    r = cdt[p1] << 10;
193
    lo = b + r;
194
    return ((lo + (lo << 16)) << 1);
195
}
196

    
197
#ifdef WORDS_BIGENDIAN
198
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
199
#else
200
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
201
#endif
202
{
203
    int lo, hi;
204

    
205
    lo = ydt[p1];
206
    lo += (lo << 6) + (lo << 11);
207
    hi = ydt[p2];
208
    hi += (hi << 6) + (hi << 11);
209
    return ((lo + (hi << 16)) << 1);
210
}
211

    
212
#ifdef WORDS_BIGENDIAN
213
static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
214
#else
215
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
216
#endif
217
{
218
    int r, b, lo;
219

    
220
    b = cdt[p2];
221
    r = cdt[p1] << 11;
222
    lo = b + r;
223
    return ((lo + (lo << 16)) << 1);
224
}
225

    
226
#ifdef WORDS_BIGENDIAN
227
static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
228
#else
229
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
230
#endif
231
{
232
    int lo, hi;
233

    
234
    lo = ydt[p1];
235
    hi = ydt[p2];
236
    return ((lo + (hi << 8) + (hi << 16)) << 1);
237
}
238

    
239
#ifdef WORDS_BIGENDIAN
240
static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
241
#else
242
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
243
#endif
244
{
245
    int r, b;
246

    
247
    b = cdt[p2];
248
    r = cdt[p1]<<16;
249
    return ((b+r) << 1);
250
}
251

    
252
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
253
{
254
    int len, i, j;
255
    unsigned char delta_pair;
256

    
257
    for (i = 0; i < 1024; i += 4)
258
    {
259
        len = *sel_vector_table++ / 2;
260
        for (j = 0; j < len; j++)
261
        {
262
            delta_pair = *sel_vector_table++;
263
            s->y_predictor_table[i+j] = 0xfffffffe &
264
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
265
            s->c_predictor_table[i+j] = 0xfffffffe &
266
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
267
        }
268
        s->y_predictor_table[i+(j-1)] |= 1;
269
        s->c_predictor_table[i+(j-1)] |= 1;
270
    }
271
}
272

    
273
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
274
{
275
    int len, i, j;
276
    unsigned char delta_pair;
277

    
278
    for (i = 0; i < 1024; i += 4)
279
    {
280
        len = *sel_vector_table++ / 2;
281
        for (j = 0; j < len; j++)
282
        {
283
            delta_pair = *sel_vector_table++;
284
            s->y_predictor_table[i+j] = 0xfffffffe &
285
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
286
            s->c_predictor_table[i+j] = 0xfffffffe &
287
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
288
        }
289
        s->y_predictor_table[i+(j-1)] |= 1;
290
        s->c_predictor_table[i+(j-1)] |= 1;
291
    }
292
}
293

    
294
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
295
{
296
    int len, i, j;
297
    unsigned char delta_pair;
298

    
299
    for (i = 0; i < 1024; i += 4)
300
    {
301
        len = *sel_vector_table++ / 2;
302
        for (j = 0; j < len; j++)
303
        {
304
            delta_pair = *sel_vector_table++;
305
            s->y_predictor_table[i+j] = 0xfffffffe &
306
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
307
            s->c_predictor_table[i+j] = 0xfffffffe &
308
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
309
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
310
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
311
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
312
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
313
        }
314
        s->y_predictor_table[i+(j-1)] |= 1;
315
        s->c_predictor_table[i+(j-1)] |= 1;
316
        s->fat_y_predictor_table[i+(j-1)] |= 1;
317
        s->fat_c_predictor_table[i+(j-1)] |= 1;
318
    }
319
}
320

    
321
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
322
 * there was an error while decoding the header */
323
static int truemotion1_decode_header(TrueMotion1Context *s)
324
{
325
    int i;
326
    struct frame_header header;
327
    uint8_t header_buffer[128];  /* logical maximum size of the header */
328
    const uint8_t *sel_vector_table;
329

    
330
    /* There is 1 change bit per 4 pixels, so each change byte represents
331
     * 32 pixels; divide width by 4 to obtain the number of change bits and
332
     * then round up to the nearest byte. */
333
    s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
334

    
335
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
336
    if (s->buf[0] < 0x10)
337
    {
338
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
339
        return -1;
340
    }
341

    
342
    /* unscramble the header bytes with a XOR operation */
343
    memset(header_buffer, 0, 128);
344
    for (i = 1; i < header.header_size; i++)
345
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
346

    
347
    header.compression = header_buffer[0];
348
    header.deltaset = header_buffer[1];
349
    header.vectable = header_buffer[2];
350
    header.ysize = AV_RL16(&header_buffer[3]);
351
    header.xsize = AV_RL16(&header_buffer[5]);
352
    header.checksum = AV_RL16(&header_buffer[7]);
353
    header.version = header_buffer[9];
354
    header.header_type = header_buffer[10];
355
    header.flags = header_buffer[11];
356
    header.control = header_buffer[12];
357

    
358
    /* Version 2 */
359
    if (header.version >= 2)
360
    {
361
        if (header.header_type > 3)
362
        {
363
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
364
            return -1;
365
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
366
            s->flags = header.flags;
367
            if (!(s->flags & FLAG_INTERFRAME))
368
                s->flags |= FLAG_KEYFRAME;
369
        } else
370
            s->flags = FLAG_KEYFRAME;
371
    } else /* Version 1 */
372
        s->flags = FLAG_KEYFRAME;
373

    
374
    if (s->flags & FLAG_SPRITE) {
375
        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
376
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
377
#if 0
378
        s->w = header.width;
379
        s->h = header.height;
380
        s->x = header.xoffset;
381
        s->y = header.yoffset;
382
#else
383
        return -1;
384
#endif
385
    } else {
386
        s->w = header.xsize;
387
        s->h = header.ysize;
388
        if (header.header_type < 2) {
389
            if ((s->w < 213) && (s->h >= 176))
390
            {
391
                s->flags |= FLAG_INTERPOLATED;
392
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
393
            }
394
        }
395
    }
396

    
397
    if (header.compression > 17) {
398
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
399
        return -1;
400
    }
401

    
402
    if ((header.deltaset != s->last_deltaset) ||
403
        (header.vectable != s->last_vectable))
404
        select_delta_tables(s, header.deltaset);
405

    
406
    if ((header.compression & 1) && header.header_type)
407
        sel_vector_table = pc_tbl2;
408
    else {
409
        if (header.vectable < 4)
410
            sel_vector_table = tables[header.vectable - 1];
411
        else {
412
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
413
            return -1;
414
        }
415
    }
416

    
417
    // FIXME: where to place this ?!?!
418
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
419
        s->avctx->pix_fmt = PIX_FMT_RGB32;
420
    else
421
        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
422

    
423
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
424
    {
425
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
426
            gen_vector_table24(s, sel_vector_table);
427
        else
428
        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
429
            gen_vector_table15(s, sel_vector_table);
430
        else
431
            gen_vector_table16(s, sel_vector_table);
432
    }
433

    
434
    /* set up pointers to the other key data chunks */
435
    s->mb_change_bits = s->buf + header.header_size;
436
    if (s->flags & FLAG_KEYFRAME) {
437
        /* no change bits specified for a keyframe; only index bytes */
438
        s->index_stream = s->mb_change_bits;
439
    } else {
440
        /* one change bit per 4x4 block */
441
        s->index_stream = s->mb_change_bits +
442
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
443
    }
444
    s->index_stream_size = s->size - (s->index_stream - s->buf);
445

    
446
    s->last_deltaset = header.deltaset;
447
    s->last_vectable = header.vectable;
448
    s->compression = header.compression;
449
    s->block_width = compression_types[header.compression].block_width;
450
    s->block_height = compression_types[header.compression].block_height;
451
    s->block_type = compression_types[header.compression].block_type;
452

    
453
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
454
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
455
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
456
            s->block_height, s->block_type,
457
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
458
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
459
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
460
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
461

    
462
    return header.header_size;
463
}
464

    
465
static int truemotion1_decode_init(AVCodecContext *avctx)
466
{
467
    TrueMotion1Context *s = avctx->priv_data;
468

    
469
    s->avctx = avctx;
470

    
471
    // FIXME: it may change ?
472
//    if (avctx->bits_per_sample == 24)
473
//        avctx->pix_fmt = PIX_FMT_RGB24;
474
//    else
475
//        avctx->pix_fmt = PIX_FMT_RGB555;
476

    
477
    s->frame.data[0] = s->prev_frame.data[0] = NULL;
478

    
479
    /* there is a vertical predictor for each pixel in a line; each vertical
480
     * predictor is 0 to start with */
481
    s->vert_pred =
482
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
483

    
484
    return 0;
485
}
486

    
487
/*
488
Block decoding order:
489

490
dxi: Y-Y
491
dxic: Y-C-Y
492
dxic2: Y-C-Y-C
493

494
hres,vres,i,i%vres (0 < i < 4)
495
2x2 0: 0 dxic2
496
2x2 1: 1 dxi
497
2x2 2: 0 dxic2
498
2x2 3: 1 dxi
499
2x4 0: 0 dxic2
500
2x4 1: 1 dxi
501
2x4 2: 2 dxi
502
2x4 3: 3 dxi
503
4x2 0: 0 dxic
504
4x2 1: 1 dxi
505
4x2 2: 0 dxic
506
4x2 3: 1 dxi
507
4x4 0: 0 dxic
508
4x4 1: 1 dxi
509
4x4 2: 2 dxi
510
4x4 3: 3 dxi
511
*/
512

    
513
#define GET_NEXT_INDEX() \
514
{\
515
    if (index_stream_index >= s->index_stream_size) { \
516
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
517
        return; \
518
    } \
519
    index = s->index_stream[index_stream_index++] * 4; \
520
}
521

    
522
#define APPLY_C_PREDICTOR() \
523
    predictor_pair = s->c_predictor_table[index]; \
524
    horiz_pred += (predictor_pair >> 1); \
525
    if (predictor_pair & 1) { \
526
        GET_NEXT_INDEX() \
527
        if (!index) { \
528
            GET_NEXT_INDEX() \
529
            predictor_pair = s->c_predictor_table[index]; \
530
            horiz_pred += ((predictor_pair >> 1) * 5); \
531
            if (predictor_pair & 1) \
532
                GET_NEXT_INDEX() \
533
            else \
534
                index++; \
535
        } \
536
    } else \
537
        index++;
538

    
539
#define APPLY_C_PREDICTOR_24() \
540
    predictor_pair = s->c_predictor_table[index]; \
541
    horiz_pred += (predictor_pair >> 1); \
542
    if (predictor_pair & 1) { \
543
        GET_NEXT_INDEX() \
544
        if (!index) { \
545
            GET_NEXT_INDEX() \
546
            predictor_pair = s->fat_c_predictor_table[index]; \
547
            horiz_pred += (predictor_pair >> 1); \
548
            if (predictor_pair & 1) \
549
                GET_NEXT_INDEX() \
550
            else \
551
                index++; \
552
        } \
553
    } else \
554
        index++;
555

    
556

    
557
#define APPLY_Y_PREDICTOR() \
558
    predictor_pair = s->y_predictor_table[index]; \
559
    horiz_pred += (predictor_pair >> 1); \
560
    if (predictor_pair & 1) { \
561
        GET_NEXT_INDEX() \
562
        if (!index) { \
563
            GET_NEXT_INDEX() \
564
            predictor_pair = s->y_predictor_table[index]; \
565
            horiz_pred += ((predictor_pair >> 1) * 5); \
566
            if (predictor_pair & 1) \
567
                GET_NEXT_INDEX() \
568
            else \
569
                index++; \
570
        } \
571
    } else \
572
        index++;
573

    
574
#define APPLY_Y_PREDICTOR_24() \
575
    predictor_pair = s->y_predictor_table[index]; \
576
    horiz_pred += (predictor_pair >> 1); \
577
    if (predictor_pair & 1) { \
578
        GET_NEXT_INDEX() \
579
        if (!index) { \
580
            GET_NEXT_INDEX() \
581
            predictor_pair = s->fat_y_predictor_table[index]; \
582
            horiz_pred += (predictor_pair >> 1); \
583
            if (predictor_pair & 1) \
584
                GET_NEXT_INDEX() \
585
            else \
586
                index++; \
587
        } \
588
    } else \
589
        index++;
590

    
591
#define OUTPUT_PIXEL_PAIR() \
592
    *current_pixel_pair = *vert_pred + horiz_pred; \
593
    *vert_pred++ = *current_pixel_pair++; \
594
    prev_pixel_pair++;
595

    
596
static void truemotion1_decode_16bit(TrueMotion1Context *s)
597
{
598
    int y;
599
    int pixels_left;  /* remaining pixels on this line */
600
    unsigned int predictor_pair;
601
    unsigned int horiz_pred;
602
    unsigned int *vert_pred;
603
    unsigned int *current_pixel_pair;
604
    unsigned int *prev_pixel_pair;
605
    unsigned char *current_line = s->frame.data[0];
606
    unsigned char *prev_line = s->prev_frame.data[0];
607
    int keyframe = s->flags & FLAG_KEYFRAME;
608

    
609
    /* these variables are for managing the stream of macroblock change bits */
610
    unsigned char *mb_change_bits = s->mb_change_bits;
611
    unsigned char mb_change_byte;
612
    unsigned char mb_change_byte_mask;
613
    int mb_change_index;
614

    
615
    /* these variables are for managing the main index stream */
616
    int index_stream_index = 0;  /* yes, the index into the index stream */
617
    int index;
618

    
619
    /* clean out the line buffer */
620
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
621

    
622
    GET_NEXT_INDEX();
623

    
624
    for (y = 0; y < s->avctx->height; y++) {
625

    
626
        /* re-init variables for the next line iteration */
627
        horiz_pred = 0;
628
        current_pixel_pair = (unsigned int *)current_line;
629
        prev_pixel_pair = (unsigned int *)prev_line;
630
        vert_pred = s->vert_pred;
631
        mb_change_index = 0;
632
        mb_change_byte = mb_change_bits[mb_change_index++];
633
        mb_change_byte_mask = 0x01;
634
        pixels_left = s->avctx->width;
635

    
636
        while (pixels_left > 0) {
637

    
638
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
639

    
640
                switch (y & 3) {
641
                case 0:
642
                    /* if macroblock width is 2, apply C-Y-C-Y; else
643
                     * apply C-Y-Y */
644
                    if (s->block_width == 2) {
645
                        APPLY_C_PREDICTOR();
646
                        APPLY_Y_PREDICTOR();
647
                        OUTPUT_PIXEL_PAIR();
648
                        APPLY_C_PREDICTOR();
649
                        APPLY_Y_PREDICTOR();
650
                        OUTPUT_PIXEL_PAIR();
651
                    } else {
652
                        APPLY_C_PREDICTOR();
653
                        APPLY_Y_PREDICTOR();
654
                        OUTPUT_PIXEL_PAIR();
655
                        APPLY_Y_PREDICTOR();
656
                        OUTPUT_PIXEL_PAIR();
657
                    }
658
                    break;
659

    
660
                case 1:
661
                case 3:
662
                    /* always apply 2 Y predictors on these iterations */
663
                    APPLY_Y_PREDICTOR();
664
                    OUTPUT_PIXEL_PAIR();
665
                    APPLY_Y_PREDICTOR();
666
                    OUTPUT_PIXEL_PAIR();
667
                    break;
668

    
669
                case 2:
670
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
671
                     * depending on the macroblock type */
672
                    if (s->block_type == BLOCK_2x2) {
673
                        APPLY_C_PREDICTOR();
674
                        APPLY_Y_PREDICTOR();
675
                        OUTPUT_PIXEL_PAIR();
676
                        APPLY_C_PREDICTOR();
677
                        APPLY_Y_PREDICTOR();
678
                        OUTPUT_PIXEL_PAIR();
679
                    } else if (s->block_type == BLOCK_4x2) {
680
                        APPLY_C_PREDICTOR();
681
                        APPLY_Y_PREDICTOR();
682
                        OUTPUT_PIXEL_PAIR();
683
                        APPLY_Y_PREDICTOR();
684
                        OUTPUT_PIXEL_PAIR();
685
                    } else {
686
                        APPLY_Y_PREDICTOR();
687
                        OUTPUT_PIXEL_PAIR();
688
                        APPLY_Y_PREDICTOR();
689
                        OUTPUT_PIXEL_PAIR();
690
                    }
691
                    break;
692
                }
693

    
694
            } else {
695

    
696
                /* skip (copy) four pixels, but reassign the horizontal
697
                 * predictor */
698
                *current_pixel_pair = *prev_pixel_pair++;
699
                *vert_pred++ = *current_pixel_pair++;
700
                *current_pixel_pair = *prev_pixel_pair++;
701
                horiz_pred = *current_pixel_pair - *vert_pred;
702
                *vert_pred++ = *current_pixel_pair++;
703

    
704
            }
705

    
706
            if (!keyframe) {
707
                mb_change_byte_mask <<= 1;
708

    
709
                /* next byte */
710
                if (!mb_change_byte_mask) {
711
                    mb_change_byte = mb_change_bits[mb_change_index++];
712
                    mb_change_byte_mask = 0x01;
713
                }
714
            }
715

    
716
            pixels_left -= 4;
717
        }
718

    
719
        /* next change row */
720
        if (((y + 1) & 3) == 0)
721
            mb_change_bits += s->mb_change_bits_row_size;
722

    
723
        current_line += s->frame.linesize[0];
724
        prev_line += s->prev_frame.linesize[0];
725
    }
726
}
727

    
728
static void truemotion1_decode_24bit(TrueMotion1Context *s)
729
{
730
    int y;
731
    int pixels_left;  /* remaining pixels on this line */
732
    unsigned int predictor_pair;
733
    unsigned int horiz_pred;
734
    unsigned int *vert_pred;
735
    unsigned int *current_pixel_pair;
736
    unsigned int *prev_pixel_pair;
737
    unsigned char *current_line = s->frame.data[0];
738
    unsigned char *prev_line = s->prev_frame.data[0];
739
    int keyframe = s->flags & FLAG_KEYFRAME;
740

    
741
    /* these variables are for managing the stream of macroblock change bits */
742
    unsigned char *mb_change_bits = s->mb_change_bits;
743
    unsigned char mb_change_byte;
744
    unsigned char mb_change_byte_mask;
745
    int mb_change_index;
746

    
747
    /* these variables are for managing the main index stream */
748
    int index_stream_index = 0;  /* yes, the index into the index stream */
749
    int index;
750

    
751
    /* clean out the line buffer */
752
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
753

    
754
    GET_NEXT_INDEX();
755

    
756
    for (y = 0; y < s->avctx->height; y++) {
757

    
758
        /* re-init variables for the next line iteration */
759
        horiz_pred = 0;
760
        current_pixel_pair = (unsigned int *)current_line;
761
        prev_pixel_pair = (unsigned int *)prev_line;
762
        vert_pred = s->vert_pred;
763
        mb_change_index = 0;
764
        mb_change_byte = mb_change_bits[mb_change_index++];
765
        mb_change_byte_mask = 0x01;
766
        pixels_left = s->avctx->width;
767

    
768
        while (pixels_left > 0) {
769

    
770
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
771

    
772
                switch (y & 3) {
773
                case 0:
774
                    /* if macroblock width is 2, apply C-Y-C-Y; else
775
                     * apply C-Y-Y */
776
                    if (s->block_width == 2) {
777
                        APPLY_C_PREDICTOR_24();
778
                        APPLY_Y_PREDICTOR_24();
779
                        OUTPUT_PIXEL_PAIR();
780
                        APPLY_C_PREDICTOR_24();
781
                        APPLY_Y_PREDICTOR_24();
782
                        OUTPUT_PIXEL_PAIR();
783
                    } else {
784
                        APPLY_C_PREDICTOR_24();
785
                        APPLY_Y_PREDICTOR_24();
786
                        OUTPUT_PIXEL_PAIR();
787
                        APPLY_Y_PREDICTOR_24();
788
                        OUTPUT_PIXEL_PAIR();
789
                    }
790
                    break;
791

    
792
                case 1:
793
                case 3:
794
                    /* always apply 2 Y predictors on these iterations */
795
                    APPLY_Y_PREDICTOR_24();
796
                    OUTPUT_PIXEL_PAIR();
797
                    APPLY_Y_PREDICTOR_24();
798
                    OUTPUT_PIXEL_PAIR();
799
                    break;
800

    
801
                case 2:
802
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
803
                     * depending on the macroblock type */
804
                    if (s->block_type == BLOCK_2x2) {
805
                        APPLY_C_PREDICTOR_24();
806
                        APPLY_Y_PREDICTOR_24();
807
                        OUTPUT_PIXEL_PAIR();
808
                        APPLY_C_PREDICTOR_24();
809
                        APPLY_Y_PREDICTOR_24();
810
                        OUTPUT_PIXEL_PAIR();
811
                    } else if (s->block_type == BLOCK_4x2) {
812
                        APPLY_C_PREDICTOR_24();
813
                        APPLY_Y_PREDICTOR_24();
814
                        OUTPUT_PIXEL_PAIR();
815
                        APPLY_Y_PREDICTOR_24();
816
                        OUTPUT_PIXEL_PAIR();
817
                    } else {
818
                        APPLY_Y_PREDICTOR_24();
819
                        OUTPUT_PIXEL_PAIR();
820
                        APPLY_Y_PREDICTOR_24();
821
                        OUTPUT_PIXEL_PAIR();
822
                    }
823
                    break;
824
                }
825

    
826
            } else {
827

    
828
                /* skip (copy) four pixels, but reassign the horizontal
829
                 * predictor */
830
                *current_pixel_pair = *prev_pixel_pair++;
831
                *vert_pred++ = *current_pixel_pair++;
832
                *current_pixel_pair = *prev_pixel_pair++;
833
                horiz_pred = *current_pixel_pair - *vert_pred;
834
                *vert_pred++ = *current_pixel_pair++;
835

    
836
            }
837

    
838
            if (!keyframe) {
839
                mb_change_byte_mask <<= 1;
840

    
841
                /* next byte */
842
                if (!mb_change_byte_mask) {
843
                    mb_change_byte = mb_change_bits[mb_change_index++];
844
                    mb_change_byte_mask = 0x01;
845
                }
846
            }
847

    
848
            pixels_left -= 4;
849
        }
850

    
851
        /* next change row */
852
        if (((y + 1) & 3) == 0)
853
            mb_change_bits += s->mb_change_bits_row_size;
854

    
855
        current_line += s->frame.linesize[0];
856
        prev_line += s->prev_frame.linesize[0];
857
    }
858
}
859

    
860

    
861
static int truemotion1_decode_frame(AVCodecContext *avctx,
862
                                    void *data, int *data_size,
863
                                    uint8_t *buf, int buf_size)
864
{
865
    TrueMotion1Context *s = avctx->priv_data;
866

    
867
    s->buf = buf;
868
    s->size = buf_size;
869

    
870
    if (truemotion1_decode_header(s) == -1)
871
        return -1;
872

    
873
    s->frame.reference = 1;
874
    if (avctx->get_buffer(avctx, &s->frame) < 0) {
875
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
876
        return -1;
877
    }
878

    
879
    /* check for a do-nothing frame and copy the previous frame */
880
    if (compression_types[s->compression].algorithm == ALGO_NOP)
881
    {
882
        memcpy(s->frame.data[0], s->prev_frame.data[0],
883
            s->frame.linesize[0] * s->avctx->height);
884
    } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
885
        truemotion1_decode_24bit(s);
886
    } else {
887
        truemotion1_decode_16bit(s);
888
    }
889

    
890
    if (s->prev_frame.data[0])
891
        avctx->release_buffer(avctx, &s->prev_frame);
892

    
893
    /* shuffle frames */
894
    s->prev_frame = s->frame;
895

    
896
    *data_size = sizeof(AVFrame);
897
    *(AVFrame*)data = s->frame;
898

    
899
    /* report that the buffer was completely consumed */
900
    return buf_size;
901
}
902

    
903
static int truemotion1_decode_end(AVCodecContext *avctx)
904
{
905
    TrueMotion1Context *s = avctx->priv_data;
906

    
907
    /* release the last frame */
908
    if (s->prev_frame.data[0])
909
        avctx->release_buffer(avctx, &s->prev_frame);
910

    
911
    av_free(s->vert_pred);
912

    
913
    return 0;
914
}
915

    
916
AVCodec truemotion1_decoder = {
917
    "truemotion1",
918
    CODEC_TYPE_VIDEO,
919
    CODEC_ID_TRUEMOTION1,
920
    sizeof(TrueMotion1Context),
921
    truemotion1_decode_init,
922
    NULL,
923
    truemotion1_decode_end,
924
    truemotion1_decode_frame,
925
    CODEC_CAP_DR1,
926
};