Statistics
| Branch: | Revision:

ffmpeg / libavcodec / truemotion1.c @ e4141433

History | View | Annotate | Download (27.7 KB)

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 truemotion1.c
24
 * Duck TrueMotion v1 Video Decoder by
25
 * Alex Beregszaszi (alex@fsn.hu) 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
#include <unistd.h>
36

    
37
#include "common.h"
38
#include "avcodec.h"
39
#include "dsputil.h"
40

    
41
#include "truemotion1data.h"
42

    
43
typedef struct TrueMotion1Context {
44
    AVCodecContext *avctx;
45
    AVFrame frame;
46
    AVFrame prev_frame;
47

    
48
    uint8_t *buf;
49
    int size;
50

    
51
    uint8_t *mb_change_bits;
52
    int mb_change_bits_row_size;
53
    uint8_t *index_stream;
54
    int index_stream_size;
55

    
56
    int flags;
57
    int x, y, w, h;
58

    
59
    uint32_t y_predictor_table[1024];
60
    uint32_t c_predictor_table[1024];
61
    uint32_t fat_y_predictor_table[1024];
62
    uint32_t fat_c_predictor_table[1024];
63

    
64
    int compression;
65
    int block_type;
66
    int block_width;
67
    int block_height;
68

    
69
    int16_t ydt[8];
70
    int16_t cdt[8];
71
    int16_t fat_ydt[8];
72
    int16_t fat_cdt[8];
73

    
74
    int last_deltaset, last_vectable;
75

    
76
    unsigned int *vert_pred;
77

    
78
} TrueMotion1Context;
79

    
80
#define FLAG_SPRITE         32
81
#define FLAG_KEYFRAME       16
82
#define FLAG_INTERFRAME      8
83
#define FLAG_INTERPOLATED    4
84

    
85
struct frame_header {
86
    uint8_t header_size;
87
    uint8_t compression;
88
    uint8_t deltaset;
89
    uint8_t vectable;
90
    uint16_t ysize;
91
    uint16_t xsize;
92
    uint16_t checksum;
93
    uint8_t version;
94
    uint8_t header_type;
95
    uint8_t flags;
96
    uint8_t control;
97
    uint16_t xoffset;
98
    uint16_t yoffset;
99
    uint16_t width;
100
    uint16_t height;
101
};
102

    
103
#define ALGO_NOP        0
104
#define ALGO_RGB16V     1
105
#define ALGO_RGB16H     2
106
#define ALGO_RGB24H     3
107

    
108
/* these are the various block sizes that can occupy a 4x4 block */
109
#define BLOCK_2x2  0
110
#define BLOCK_2x4  1
111
#define BLOCK_4x2  2
112
#define BLOCK_4x4  3
113

    
114
typedef struct comp_types {
115
    int algorithm;
116
    int block_width; // vres
117
    int block_height; // hres
118
    int block_type;
119
} comp_types;
120

    
121
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
122
static comp_types compression_types[17] = {
123
    { ALGO_NOP,    0, 0, 0 },
124

    
125
    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
126
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
127
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
128
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
129

    
130
    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
131
    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
132
    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
133
    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
134

    
135
    { ALGO_NOP,    4, 4, BLOCK_4x4 },
136
    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
137
    { ALGO_NOP,    4, 2, BLOCK_4x2 },
138
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
139

    
140
    { ALGO_NOP,    2, 4, BLOCK_2x4 },
141
    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
142
    { ALGO_NOP,    2, 2, BLOCK_2x2 },
143
    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
144
};
145

    
146
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
147
{
148
    int i;
149

    
150
    if (delta_table_index > 3)
151
        return;
152

    
153
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
154
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
155
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
156
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
157

    
158
    /* Y skinny deltas need to be halved for some reason; maybe the
159
     * skinny Y deltas should be modified */
160
    for (i = 0; i < 8; i++)
161
    {
162
        /* drop the lsb before dividing by 2-- net effect: round down
163
         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
164
        s->ydt[i] &= 0xFFFE;
165
        s->ydt[i] /= 2;
166
    }
167
}
168

    
169
#ifdef WORDS_BIGENDIAN
170
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
171
#else
172
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
173
#endif
174
{
175
    int lo, hi;
176

    
177
    lo = ydt[p1];
178
    lo += (lo << 5) + (lo << 10);
179
    hi = ydt[p2];
180
    hi += (hi << 5) + (hi << 10);
181
    return ((lo + (hi << 16)) << 1);
182
}
183

    
184
#ifdef WORDS_BIGENDIAN
185
static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
186
#else
187
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
188
#endif
189
{
190
    int r, b, lo;
191

    
192
    b = cdt[p2];
193
    r = cdt[p1] << 10;
194
    lo = b + r;
195
    return ((lo + (lo << 16)) << 1);
196
}
197

    
198
#ifdef WORDS_BIGENDIAN
199
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
200
#else
201
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
202
#endif
203
{
204
    int lo, hi;
205

    
206
    lo = ydt[p1];
207
    lo += (lo << 6) + (lo << 11);
208
    hi = ydt[p2];
209
    hi += (hi << 6) + (hi << 11);
210
    return ((lo + (hi << 16)) << 1);
211
}
212

    
213
#ifdef WORDS_BIGENDIAN
214
static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
215
#else
216
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
217
#endif
218
{
219
    int r, b, lo;
220

    
221
    b = cdt[p2];
222
    r = cdt[p1] << 11;
223
    lo = b + r;
224
    return ((lo + (lo << 16)) << 1);
225
}
226

    
227
#ifdef WORDS_BIGENDIAN
228
static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
229
#else
230
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
231
#endif
232
{
233
    int lo, hi;
234

    
235
    lo = ydt[p1];
236
    hi = ydt[p2];
237
    return ((lo + (hi << 8) + (hi << 16)) << 1);
238
}
239

    
240
#ifdef WORDS_BIGENDIAN
241
static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
242
#else
243
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
244
#endif
245
{
246
    int r, b;
247

    
248
    b = cdt[p2];
249
    r = cdt[p1]<<16;
250
    return ((b+r) << 1);
251
}
252

    
253
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
254
{
255
    int len, i, j;
256
    unsigned char delta_pair;
257

    
258
    for (i = 0; i < 1024; i += 4)
259
    {
260
        len = *sel_vector_table++ / 2;
261
        for (j = 0; j < len; j++)
262
        {
263
            delta_pair = *sel_vector_table++;
264
            s->y_predictor_table[i+j] = 0xfffffffe &
265
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
266
            s->c_predictor_table[i+j] = 0xfffffffe &
267
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
268
        }
269
        s->y_predictor_table[i+(j-1)] |= 1;
270
        s->c_predictor_table[i+(j-1)] |= 1;
271
    }
272
}
273

    
274
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
275
{
276
    int len, i, j;
277
    unsigned char delta_pair;
278

    
279
    for (i = 0; i < 1024; i += 4)
280
    {
281
        len = *sel_vector_table++ / 2;
282
        for (j = 0; j < len; j++)
283
        {
284
            delta_pair = *sel_vector_table++;
285
            s->y_predictor_table[i+j] = 0xfffffffe &
286
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
287
            s->c_predictor_table[i+j] = 0xfffffffe &
288
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
289
        }
290
        s->y_predictor_table[i+(j-1)] |= 1;
291
        s->c_predictor_table[i+(j-1)] |= 1;
292
    }
293
}
294

    
295
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
296
{
297
    int len, i, j;
298
    unsigned char delta_pair;
299

    
300
    for (i = 0; i < 1024; i += 4)
301
    {
302
        len = *sel_vector_table++ / 2;
303
        for (j = 0; j < len; j++)
304
        {
305
            delta_pair = *sel_vector_table++;
306
            s->y_predictor_table[i+j] = 0xfffffffe &
307
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
308
            s->c_predictor_table[i+j] = 0xfffffffe &
309
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
310
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
311
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
312
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
313
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
314
        }
315
        s->y_predictor_table[i+(j-1)] |= 1;
316
        s->c_predictor_table[i+(j-1)] |= 1;
317
        s->fat_y_predictor_table[i+(j-1)] |= 1;
318
        s->fat_c_predictor_table[i+(j-1)] |= 1;
319
    }
320
}
321

    
322
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
323
 * there was an error while decoding the header */
324
static int truemotion1_decode_header(TrueMotion1Context *s)
325
{
326
    int i;
327
    struct frame_header header;
328
    uint8_t header_buffer[128];  /* logical maximum size of the header */
329
    const uint8_t *sel_vector_table;
330

    
331
    /* There is 1 change bit per 4 pixels, so each change byte represents
332
     * 32 pixels; divide width by 4 to obtain the number of change bits and
333
     * then round up to the nearest byte. */
334
    s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
335

    
336
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
337
    if (s->buf[0] < 0x10)
338
    {
339
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
340
        return -1;
341
    }
342

    
343
    /* unscramble the header bytes with a XOR operation */
344
    memset(header_buffer, 0, 128);
345
    for (i = 1; i < header.header_size; i++)
346
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
347

    
348
    header.compression = header_buffer[0];
349
    header.deltaset = header_buffer[1];
350
    header.vectable = header_buffer[2];
351
    header.ysize = AV_RL16(&header_buffer[3]);
352
    header.xsize = AV_RL16(&header_buffer[5]);
353
    header.checksum = AV_RL16(&header_buffer[7]);
354
    header.version = header_buffer[9];
355
    header.header_type = header_buffer[10];
356
    header.flags = header_buffer[11];
357
    header.control = header_buffer[12];
358

    
359
    /* Version 2 */
360
    if (header.version >= 2)
361
    {
362
        if (header.header_type > 3)
363
        {
364
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
365
            return -1;
366
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
367
            s->flags = header.flags;
368
            if (!(s->flags & FLAG_INTERFRAME))
369
                s->flags |= FLAG_KEYFRAME;
370
        } else
371
            s->flags = FLAG_KEYFRAME;
372
    } else /* Version 1 */
373
        s->flags = FLAG_KEYFRAME;
374

    
375
    if (s->flags & FLAG_SPRITE) {
376
        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
377
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
378
#if 0
379
        s->w = header.width;
380
        s->h = header.height;
381
        s->x = header.xoffset;
382
        s->y = header.yoffset;
383
#else
384
        return -1;
385
#endif
386
    } else {
387
        s->w = header.xsize;
388
        s->h = header.ysize;
389
        if (header.header_type < 2) {
390
            if ((s->w < 213) && (s->h >= 176))
391
            {
392
                s->flags |= FLAG_INTERPOLATED;
393
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
394
            }
395
        }
396
    }
397

    
398
    if (header.compression > 17) {
399
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
400
        return -1;
401
    }
402

    
403
    if ((header.deltaset != s->last_deltaset) ||
404
        (header.vectable != s->last_vectable))
405
        select_delta_tables(s, header.deltaset);
406

    
407
    if ((header.compression & 1) && header.header_type)
408
        sel_vector_table = pc_tbl2;
409
    else {
410
        if (header.vectable < 4)
411
            sel_vector_table = tables[header.vectable - 1];
412
        else {
413
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
414
            return -1;
415
        }
416
    }
417

    
418
    // FIXME: where to place this ?!?!
419
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
420
        s->avctx->pix_fmt = PIX_FMT_RGB32;
421
    else
422
        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
423

    
424
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
425
    {
426
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
427
            gen_vector_table24(s, sel_vector_table);
428
        else
429
        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
430
            gen_vector_table15(s, sel_vector_table);
431
        else
432
            gen_vector_table16(s, sel_vector_table);
433
    }
434

    
435
    /* set up pointers to the other key data chunks */
436
    s->mb_change_bits = s->buf + header.header_size;
437
    if (s->flags & FLAG_KEYFRAME) {
438
        /* no change bits specified for a keyframe; only index bytes */
439
        s->index_stream = s->mb_change_bits;
440
    } else {
441
        /* one change bit per 4x4 block */
442
        s->index_stream = s->mb_change_bits +
443
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
444
    }
445
    s->index_stream_size = s->size - (s->index_stream - s->buf);
446

    
447
    s->last_deltaset = header.deltaset;
448
    s->last_vectable = header.vectable;
449
    s->compression = header.compression;
450
    s->block_width = compression_types[header.compression].block_width;
451
    s->block_height = compression_types[header.compression].block_height;
452
    s->block_type = compression_types[header.compression].block_type;
453

    
454
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
455
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
456
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
457
            s->block_height, s->block_type,
458
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
459
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
460
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
461
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
462

    
463
    return header.header_size;
464
}
465

    
466
static int truemotion1_decode_init(AVCodecContext *avctx)
467
{
468
    TrueMotion1Context *s = avctx->priv_data;
469

    
470
    s->avctx = avctx;
471

    
472
    // FIXME: it may change ?
473
//    if (avctx->bits_per_sample == 24)
474
//        avctx->pix_fmt = PIX_FMT_RGB24;
475
//    else
476
//        avctx->pix_fmt = PIX_FMT_RGB555;
477

    
478
    s->frame.data[0] = s->prev_frame.data[0] = NULL;
479

    
480
    /* there is a vertical predictor for each pixel in a line; each vertical
481
     * predictor is 0 to start with */
482
    s->vert_pred =
483
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
484

    
485
    return 0;
486
}
487

    
488
/*
489
Block decoding order:
490

491
dxi: Y-Y
492
dxic: Y-C-Y
493
dxic2: Y-C-Y-C
494

495
hres,vres,i,i%vres (0 < i < 4)
496
2x2 0: 0 dxic2
497
2x2 1: 1 dxi
498
2x2 2: 0 dxic2
499
2x2 3: 1 dxi
500
2x4 0: 0 dxic2
501
2x4 1: 1 dxi
502
2x4 2: 2 dxi
503
2x4 3: 3 dxi
504
4x2 0: 0 dxic
505
4x2 1: 1 dxi
506
4x2 2: 0 dxic
507
4x2 3: 1 dxi
508
4x4 0: 0 dxic
509
4x4 1: 1 dxi
510
4x4 2: 2 dxi
511
4x4 3: 3 dxi
512
*/
513

    
514
#define GET_NEXT_INDEX() \
515
{\
516
    if (index_stream_index >= s->index_stream_size) { \
517
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
518
        return; \
519
    } \
520
    index = s->index_stream[index_stream_index++] * 4; \
521
}
522

    
523
#define APPLY_C_PREDICTOR() \
524
    predictor_pair = s->c_predictor_table[index]; \
525
    horiz_pred += (predictor_pair >> 1); \
526
    if (predictor_pair & 1) { \
527
        GET_NEXT_INDEX() \
528
        if (!index) { \
529
            GET_NEXT_INDEX() \
530
            predictor_pair = s->c_predictor_table[index]; \
531
            horiz_pred += ((predictor_pair >> 1) * 5); \
532
            if (predictor_pair & 1) \
533
                GET_NEXT_INDEX() \
534
            else \
535
                index++; \
536
        } \
537
    } else \
538
        index++;
539

    
540
#define APPLY_C_PREDICTOR_24() \
541
    predictor_pair = s->c_predictor_table[index]; \
542
    horiz_pred += (predictor_pair >> 1); \
543
    if (predictor_pair & 1) { \
544
        GET_NEXT_INDEX() \
545
        if (!index) { \
546
            GET_NEXT_INDEX() \
547
            predictor_pair = s->fat_c_predictor_table[index]; \
548
            horiz_pred += (predictor_pair >> 1); \
549
            if (predictor_pair & 1) \
550
                GET_NEXT_INDEX() \
551
            else \
552
                index++; \
553
        } \
554
    } else \
555
        index++;
556

    
557

    
558
#define APPLY_Y_PREDICTOR() \
559
    predictor_pair = s->y_predictor_table[index]; \
560
    horiz_pred += (predictor_pair >> 1); \
561
    if (predictor_pair & 1) { \
562
        GET_NEXT_INDEX() \
563
        if (!index) { \
564
            GET_NEXT_INDEX() \
565
            predictor_pair = s->y_predictor_table[index]; \
566
            horiz_pred += ((predictor_pair >> 1) * 5); \
567
            if (predictor_pair & 1) \
568
                GET_NEXT_INDEX() \
569
            else \
570
                index++; \
571
        } \
572
    } else \
573
        index++;
574

    
575
#define APPLY_Y_PREDICTOR_24() \
576
    predictor_pair = s->y_predictor_table[index]; \
577
    horiz_pred += (predictor_pair >> 1); \
578
    if (predictor_pair & 1) { \
579
        GET_NEXT_INDEX() \
580
        if (!index) { \
581
            GET_NEXT_INDEX() \
582
            predictor_pair = s->fat_y_predictor_table[index]; \
583
            horiz_pred += (predictor_pair >> 1); \
584
            if (predictor_pair & 1) \
585
                GET_NEXT_INDEX() \
586
            else \
587
                index++; \
588
        } \
589
    } else \
590
        index++;
591

    
592
#define OUTPUT_PIXEL_PAIR() \
593
    *current_pixel_pair = *vert_pred + horiz_pred; \
594
    *vert_pred++ = *current_pixel_pair++; \
595
    prev_pixel_pair++;
596

    
597
static void truemotion1_decode_16bit(TrueMotion1Context *s)
598
{
599
    int y;
600
    int pixels_left;  /* remaining pixels on this line */
601
    unsigned int predictor_pair;
602
    unsigned int horiz_pred;
603
    unsigned int *vert_pred;
604
    unsigned int *current_pixel_pair;
605
    unsigned int *prev_pixel_pair;
606
    unsigned char *current_line = s->frame.data[0];
607
    unsigned char *prev_line = s->prev_frame.data[0];
608
    int keyframe = s->flags & FLAG_KEYFRAME;
609

    
610
    /* these variables are for managing the stream of macroblock change bits */
611
    unsigned char *mb_change_bits = s->mb_change_bits;
612
    unsigned char mb_change_byte;
613
    unsigned char mb_change_byte_mask;
614
    int mb_change_index;
615

    
616
    /* these variables are for managing the main index stream */
617
    int index_stream_index = 0;  /* yes, the index into the index stream */
618
    int index;
619

    
620
    /* clean out the line buffer */
621
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
622

    
623
    GET_NEXT_INDEX();
624

    
625
    for (y = 0; y < s->avctx->height; y++) {
626

    
627
        /* re-init variables for the next line iteration */
628
        horiz_pred = 0;
629
        current_pixel_pair = (unsigned int *)current_line;
630
        prev_pixel_pair = (unsigned int *)prev_line;
631
        vert_pred = s->vert_pred;
632
        mb_change_index = 0;
633
        mb_change_byte = mb_change_bits[mb_change_index++];
634
        mb_change_byte_mask = 0x01;
635
        pixels_left = s->avctx->width;
636

    
637
        while (pixels_left > 0) {
638

    
639
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
640

    
641
                switch (y & 3) {
642
                case 0:
643
                    /* if macroblock width is 2, apply C-Y-C-Y; else
644
                     * apply C-Y-Y */
645
                    if (s->block_width == 2) {
646
                        APPLY_C_PREDICTOR();
647
                        APPLY_Y_PREDICTOR();
648
                        OUTPUT_PIXEL_PAIR();
649
                        APPLY_C_PREDICTOR();
650
                        APPLY_Y_PREDICTOR();
651
                        OUTPUT_PIXEL_PAIR();
652
                    } else {
653
                        APPLY_C_PREDICTOR();
654
                        APPLY_Y_PREDICTOR();
655
                        OUTPUT_PIXEL_PAIR();
656
                        APPLY_Y_PREDICTOR();
657
                        OUTPUT_PIXEL_PAIR();
658
                    }
659
                    break;
660

    
661
                case 1:
662
                case 3:
663
                    /* always apply 2 Y predictors on these iterations */
664
                    APPLY_Y_PREDICTOR();
665
                    OUTPUT_PIXEL_PAIR();
666
                    APPLY_Y_PREDICTOR();
667
                    OUTPUT_PIXEL_PAIR();
668
                    break;
669

    
670
                case 2:
671
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
672
                     * depending on the macroblock type */
673
                    if (s->block_type == BLOCK_2x2) {
674
                        APPLY_C_PREDICTOR();
675
                        APPLY_Y_PREDICTOR();
676
                        OUTPUT_PIXEL_PAIR();
677
                        APPLY_C_PREDICTOR();
678
                        APPLY_Y_PREDICTOR();
679
                        OUTPUT_PIXEL_PAIR();
680
                    } else if (s->block_type == BLOCK_4x2) {
681
                        APPLY_C_PREDICTOR();
682
                        APPLY_Y_PREDICTOR();
683
                        OUTPUT_PIXEL_PAIR();
684
                        APPLY_Y_PREDICTOR();
685
                        OUTPUT_PIXEL_PAIR();
686
                    } else {
687
                        APPLY_Y_PREDICTOR();
688
                        OUTPUT_PIXEL_PAIR();
689
                        APPLY_Y_PREDICTOR();
690
                        OUTPUT_PIXEL_PAIR();
691
                    }
692
                    break;
693
                }
694

    
695
            } else {
696

    
697
                /* skip (copy) four pixels, but reassign the horizontal
698
                 * predictor */
699
                *current_pixel_pair = *prev_pixel_pair++;
700
                *vert_pred++ = *current_pixel_pair++;
701
                *current_pixel_pair = *prev_pixel_pair++;
702
                horiz_pred = *current_pixel_pair - *vert_pred;
703
                *vert_pred++ = *current_pixel_pair++;
704

    
705
            }
706

    
707
            if (!keyframe) {
708
                mb_change_byte_mask <<= 1;
709

    
710
                /* next byte */
711
                if (!mb_change_byte_mask) {
712
                    mb_change_byte = mb_change_bits[mb_change_index++];
713
                    mb_change_byte_mask = 0x01;
714
                }
715
            }
716

    
717
            pixels_left -= 4;
718
        }
719

    
720
        /* next change row */
721
        if (((y + 1) & 3) == 0)
722
            mb_change_bits += s->mb_change_bits_row_size;
723

    
724
        current_line += s->frame.linesize[0];
725
        prev_line += s->prev_frame.linesize[0];
726
    }
727
}
728

    
729
static void truemotion1_decode_24bit(TrueMotion1Context *s)
730
{
731
    int y;
732
    int pixels_left;  /* remaining pixels on this line */
733
    unsigned int predictor_pair;
734
    unsigned int horiz_pred;
735
    unsigned int *vert_pred;
736
    unsigned int *current_pixel_pair;
737
    unsigned int *prev_pixel_pair;
738
    unsigned char *current_line = s->frame.data[0];
739
    unsigned char *prev_line = s->prev_frame.data[0];
740
    int keyframe = s->flags & FLAG_KEYFRAME;
741

    
742
    /* these variables are for managing the stream of macroblock change bits */
743
    unsigned char *mb_change_bits = s->mb_change_bits;
744
    unsigned char mb_change_byte;
745
    unsigned char mb_change_byte_mask;
746
    int mb_change_index;
747

    
748
    /* these variables are for managing the main index stream */
749
    int index_stream_index = 0;  /* yes, the index into the index stream */
750
    int index;
751

    
752
    /* clean out the line buffer */
753
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
754

    
755
    GET_NEXT_INDEX();
756

    
757
    for (y = 0; y < s->avctx->height; y++) {
758

    
759
        /* re-init variables for the next line iteration */
760
        horiz_pred = 0;
761
        current_pixel_pair = (unsigned int *)current_line;
762
        prev_pixel_pair = (unsigned int *)prev_line;
763
        vert_pred = s->vert_pred;
764
        mb_change_index = 0;
765
        mb_change_byte = mb_change_bits[mb_change_index++];
766
        mb_change_byte_mask = 0x01;
767
        pixels_left = s->avctx->width;
768

    
769
        while (pixels_left > 0) {
770

    
771
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
772

    
773
                switch (y & 3) {
774
                case 0:
775
                    /* if macroblock width is 2, apply C-Y-C-Y; else
776
                     * apply C-Y-Y */
777
                    if (s->block_width == 2) {
778
                        APPLY_C_PREDICTOR_24();
779
                        APPLY_Y_PREDICTOR_24();
780
                        OUTPUT_PIXEL_PAIR();
781
                        APPLY_C_PREDICTOR_24();
782
                        APPLY_Y_PREDICTOR_24();
783
                        OUTPUT_PIXEL_PAIR();
784
                    } else {
785
                        APPLY_C_PREDICTOR_24();
786
                        APPLY_Y_PREDICTOR_24();
787
                        OUTPUT_PIXEL_PAIR();
788
                        APPLY_Y_PREDICTOR_24();
789
                        OUTPUT_PIXEL_PAIR();
790
                    }
791
                    break;
792

    
793
                case 1:
794
                case 3:
795
                    /* always apply 2 Y predictors on these iterations */
796
                    APPLY_Y_PREDICTOR_24();
797
                    OUTPUT_PIXEL_PAIR();
798
                    APPLY_Y_PREDICTOR_24();
799
                    OUTPUT_PIXEL_PAIR();
800
                    break;
801

    
802
                case 2:
803
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
804
                     * depending on the macroblock type */
805
                    if (s->block_type == BLOCK_2x2) {
806
                        APPLY_C_PREDICTOR_24();
807
                        APPLY_Y_PREDICTOR_24();
808
                        OUTPUT_PIXEL_PAIR();
809
                        APPLY_C_PREDICTOR_24();
810
                        APPLY_Y_PREDICTOR_24();
811
                        OUTPUT_PIXEL_PAIR();
812
                    } else if (s->block_type == BLOCK_4x2) {
813
                        APPLY_C_PREDICTOR_24();
814
                        APPLY_Y_PREDICTOR_24();
815
                        OUTPUT_PIXEL_PAIR();
816
                        APPLY_Y_PREDICTOR_24();
817
                        OUTPUT_PIXEL_PAIR();
818
                    } else {
819
                        APPLY_Y_PREDICTOR_24();
820
                        OUTPUT_PIXEL_PAIR();
821
                        APPLY_Y_PREDICTOR_24();
822
                        OUTPUT_PIXEL_PAIR();
823
                    }
824
                    break;
825
                }
826

    
827
            } else {
828

    
829
                /* skip (copy) four pixels, but reassign the horizontal
830
                 * predictor */
831
                *current_pixel_pair = *prev_pixel_pair++;
832
                *vert_pred++ = *current_pixel_pair++;
833
                *current_pixel_pair = *prev_pixel_pair++;
834
                horiz_pred = *current_pixel_pair - *vert_pred;
835
                *vert_pred++ = *current_pixel_pair++;
836

    
837
            }
838

    
839
            if (!keyframe) {
840
                mb_change_byte_mask <<= 1;
841

    
842
                /* next byte */
843
                if (!mb_change_byte_mask) {
844
                    mb_change_byte = mb_change_bits[mb_change_index++];
845
                    mb_change_byte_mask = 0x01;
846
                }
847
            }
848

    
849
            pixels_left -= 4;
850
        }
851

    
852
        /* next change row */
853
        if (((y + 1) & 3) == 0)
854
            mb_change_bits += s->mb_change_bits_row_size;
855

    
856
        current_line += s->frame.linesize[0];
857
        prev_line += s->prev_frame.linesize[0];
858
    }
859
}
860

    
861

    
862
static int truemotion1_decode_frame(AVCodecContext *avctx,
863
                                    void *data, int *data_size,
864
                                    uint8_t *buf, int buf_size)
865
{
866
    TrueMotion1Context *s = avctx->priv_data;
867

    
868
    s->buf = buf;
869
    s->size = buf_size;
870

    
871
    if (truemotion1_decode_header(s) == -1)
872
        return -1;
873

    
874
    s->frame.reference = 1;
875
    if (avctx->get_buffer(avctx, &s->frame) < 0) {
876
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
877
        return -1;
878
    }
879

    
880
    /* check for a do-nothing frame and copy the previous frame */
881
    if (compression_types[s->compression].algorithm == ALGO_NOP)
882
    {
883
        memcpy(s->frame.data[0], s->prev_frame.data[0],
884
            s->frame.linesize[0] * s->avctx->height);
885
    } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
886
        truemotion1_decode_24bit(s);
887
    } else {
888
        truemotion1_decode_16bit(s);
889
    }
890

    
891
    if (s->prev_frame.data[0])
892
        avctx->release_buffer(avctx, &s->prev_frame);
893

    
894
    /* shuffle frames */
895
    s->prev_frame = s->frame;
896

    
897
    *data_size = sizeof(AVFrame);
898
    *(AVFrame*)data = s->frame;
899

    
900
    /* report that the buffer was completely consumed */
901
    return buf_size;
902
}
903

    
904
static int truemotion1_decode_end(AVCodecContext *avctx)
905
{
906
    TrueMotion1Context *s = avctx->priv_data;
907

    
908
    /* release the last frame */
909
    if (s->prev_frame.data[0])
910
        avctx->release_buffer(avctx, &s->prev_frame);
911

    
912
    av_free(s->vert_pred);
913

    
914
    return 0;
915
}
916

    
917
AVCodec truemotion1_decoder = {
918
    "truemotion1",
919
    CODEC_TYPE_VIDEO,
920
    CODEC_ID_TRUEMOTION1,
921
    sizeof(TrueMotion1Context),
922
    truemotion1_decode_init,
923
    NULL,
924
    truemotion1_decode_end,
925
    truemotion1_decode_frame,
926
    CODEC_CAP_DR1,
927
};