truemotion1.c 26.9 KB
Newer Older
1 2 3 4
/*
 * Duck TrueMotion 1.0 Decoder
 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
 *
5 6 7
 * This file is part of FFmpeg.
 *
 * FFmpeg is free software; you can redistribute it and/or
8 9
 * modify it under the terms of the GNU Lesser General Public
 * 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 14 15 16 17
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
18
 * License along with FFmpeg; if not, write to the Free Software
19
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 21 22
 */

/**
23
 * @file
24
 * Duck TrueMotion v1 Video Decoder by
25
 * Alex Beregszaszi and
26 27 28
 * Mike Melanson (melanson@pcisys.net)
 *
 * 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 33 34 35 36 37 38 39 40 41 42 43 44
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include "avcodec.h"
#include "dsputil.h"

#include "truemotion1data.h"

typedef struct TrueMotion1Context {
    AVCodecContext *avctx;
    AVFrame frame;

Michael Niedermayer's avatar
Michael Niedermayer committed
45
    const uint8_t *buf;
46 47
    int size;

Michael Niedermayer's avatar
Michael Niedermayer committed
48
    const uint8_t *mb_change_bits;
49
    int mb_change_bits_row_size;
Michael Niedermayer's avatar
Michael Niedermayer committed
50
    const uint8_t *index_stream;
51 52 53 54
    int index_stream_size;

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

56 57
    uint32_t y_predictor_table[1024];
    uint32_t c_predictor_table[1024];
58 59
    uint32_t fat_y_predictor_table[1024];
    uint32_t fat_c_predictor_table[1024];
60

61 62 63 64 65
    int compression;
    int block_type;
    int block_width;
    int block_height;

66 67 68 69
    int16_t ydt[8];
    int16_t cdt[8];
    int16_t fat_ydt[8];
    int16_t fat_cdt[8];
70

71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112
    int last_deltaset, last_vectable;

    unsigned int *vert_pred;

} TrueMotion1Context;

#define FLAG_SPRITE         32
#define FLAG_KEYFRAME       16
#define FLAG_INTERFRAME      8
#define FLAG_INTERPOLATED    4

struct frame_header {
    uint8_t header_size;
    uint8_t compression;
    uint8_t deltaset;
    uint8_t vectable;
    uint16_t ysize;
    uint16_t xsize;
    uint16_t checksum;
    uint8_t version;
    uint8_t header_type;
    uint8_t flags;
    uint8_t control;
    uint16_t xoffset;
    uint16_t yoffset;
    uint16_t width;
    uint16_t height;
};

#define ALGO_NOP        0
#define ALGO_RGB16V     1
#define ALGO_RGB16H     2
#define ALGO_RGB24H     3

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

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

118
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
119
static const comp_types compression_types[17] = {
120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149
    { ALGO_NOP,    0, 0, 0 },

    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },

    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },

    { ALGO_NOP,    4, 4, BLOCK_4x4 },
    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
    { ALGO_NOP,    4, 2, BLOCK_4x2 },
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },

    { ALGO_NOP,    2, 4, BLOCK_2x4 },
    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
    { ALGO_NOP,    2, 2, BLOCK_2x2 },
    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
};

static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
{
    int i;

    if (delta_table_index > 3)
        return;

150 151 152 153
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
154 155 156 157 158 159 160 161 162 163 164 165

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

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

174 175 176 177
    lo = ydt[p1];
    lo += (lo << 5) + (lo << 10);
    hi = ydt[p2];
    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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

297 298 299 300 301 302
    for (i = 0; i < 1024; i += 4)
    {
        len = *sel_vector_table++ / 2;
        for (j = 0; j < len; j++)
        {
            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);
311 312 313
        }
        s->y_predictor_table[i+(j-1)] |= 1;
        s->c_predictor_table[i+(j-1)] |= 1;
314 315
        s->fat_y_predictor_table[i+(j-1)] |= 1;
        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 */
321 322 323 324 325
static int truemotion1_decode_header(TrueMotion1Context *s)
{
    int i;
    struct frame_header header;
    uint8_t header_buffer[128];  /* logical maximum size of the header */
Michael Niedermayer's avatar
Michael Niedermayer committed
326
    const uint8_t *sel_vector_table;
327 328 329 330 331 332 333 334 335

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

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

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

345 346 347
    header.compression = header_buffer[0];
    header.deltaset = header_buffer[1];
    header.vectable = header_buffer[2];
348 349 350
    header.ysize = AV_RL16(&header_buffer[3]);
    header.xsize = AV_RL16(&header_buffer[5]);
    header.checksum = AV_RL16(&header_buffer[7]);
351 352 353 354 355 356 357 358 359 360
    header.version = header_buffer[9];
    header.header_type = header_buffer[10];
    header.flags = header_buffer[11];
    header.control = header_buffer[12];

    /* Version 2 */
    if (header.version >= 2)
    {
        if (header.header_type > 3)
        {
361
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
362 363 364 365 366 367 368 369 370
            return -1;
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
            s->flags = header.flags;
            if (!(s->flags & FLAG_INTERFRAME))
                s->flags |= FLAG_KEYFRAME;
        } else
            s->flags = FLAG_KEYFRAME;
    } else /* Version 1 */
        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");
374 375
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
#if 0
376 377 378 379
        s->w = header.width;
        s->h = header.height;
        s->x = header.xoffset;
        s->y = header.yoffset;
380 381 382
#else
        return -1;
#endif
383 384 385 386 387
    } else {
        s->w = header.xsize;
        s->h = header.ysize;
        if (header.header_type < 2) {
            if ((s->w < 213) && (s->h >= 176))
388
            {
389
                s->flags |= FLAG_INTERPOLATED;
390 391
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
            }
392 393 394
        }
    }

395
    if (header.compression >= 17) {
Alex Beregszaszi's avatar
Alex Beregszaszi committed
396
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
397 398
        return -1;
    }
399 400

    if ((header.deltaset != s->last_deltaset) ||
401 402 403 404 405 406 407 408 409
        (header.vectable != s->last_vectable))
        select_delta_tables(s, header.deltaset);

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

415 416
    // FIXME: where to place this ?!?!
    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
420 421 422 423

    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
    {
        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);
430 431 432 433 434 435 436 437 438
    }

    /* set up pointers to the other key data chunks */
    s->mb_change_bits = s->buf + header.header_size;
    if (s->flags & FLAG_KEYFRAME) {
        /* no change bits specified for a keyframe; only index bytes */
        s->index_stream = s->mb_change_bits;
    } else {
        /* one change bit per 4x4 block */
439
        s->index_stream = s->mb_change_bits +
440 441 442 443 444 445 446 447 448 449 450
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
    }
    s->index_stream_size = s->size - (s->index_stream - s->buf);

    s->last_deltaset = header.deltaset;
    s->last_vectable = header.vectable;
    s->compression = header.compression;
    s->block_width = compression_types[header.compression].block_width;
    s->block_height = compression_types[header.compression].block_height;
    s->block_type = compression_types[header.compression].block_type;

451
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
452 453 454 455 456 457 458
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
            s->block_height, s->block_type,
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
            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;
466 467 468

    s->avctx = avctx;

469 470
    // FIXME: it may change ?
//    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;
476 477 478

    /* there is a vertical predictor for each pixel in a line; each vertical
     * predictor is 0 to start with */
479
    s->vert_pred =
480
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
481 482 483 484

    return 0;
}

485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510
/*
Block decoding order:

dxi: Y-Y
dxic: Y-C-Y
dxic2: Y-C-Y-C

hres,vres,i,i%vres (0 < i < 4)
2x2 0: 0 dxic2
2x2 1: 1 dxi
2x2 2: 0 dxic2
2x2 3: 1 dxi
2x4 0: 0 dxic2
2x4 1: 1 dxi
2x4 2: 2 dxi
2x4 3: 3 dxi
4x2 0: 0 dxic
4x2 1: 1 dxi
4x2 2: 0 dxic
4x2 3: 1 dxi
4x4 0: 0 dxic
4x4 1: 1 dxi
4x4 2: 2 dxi
4x4 3: 3 dxi
*/

511 512 513
#define GET_NEXT_INDEX() \
{\
    if (index_stream_index >= s->index_stream_size) { \
Alex Beregszaszi's avatar
Alex Beregszaszi committed
514
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536
        return; \
    } \
    index = s->index_stream[index_stream_index++] * 4; \
}

#define APPLY_C_PREDICTOR() \
    predictor_pair = s->c_predictor_table[index]; \
    horiz_pred += (predictor_pair >> 1); \
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->c_predictor_table[index]; \
            horiz_pred += ((predictor_pair >> 1) * 5); \
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                index++; \
        } \
    } else \
        index++;

537 538
#define APPLY_C_PREDICTOR_24() \
    predictor_pair = s->c_predictor_table[index]; \
539
    horiz_pred += (predictor_pair >> 1); \
540 541 542 543 544
    if (predictor_pair & 1) { \
        GET_NEXT_INDEX() \
        if (!index) { \
            GET_NEXT_INDEX() \
            predictor_pair = s->fat_c_predictor_table[index]; \
545
            horiz_pred += (predictor_pair >> 1); \
546 547 548 549 550 551
            if (predictor_pair & 1) \
                GET_NEXT_INDEX() \
            else \
                index++; \
        } \
    } else \
552
        index++;
553 554


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

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

589 590
#define OUTPUT_PIXEL_PAIR() \
    *current_pixel_pair = *vert_pred + horiz_pred; \
591
    *vert_pred++ = *current_pixel_pair++;
592 593 594 595 596 597 598 599 600 601 602 603 604

static void truemotion1_decode_16bit(TrueMotion1Context *s)
{
    int y;
    int pixels_left;  /* remaining pixels on this line */
    unsigned int predictor_pair;
    unsigned int horiz_pred;
    unsigned int *vert_pred;
    unsigned int *current_pixel_pair;
    unsigned char *current_line = s->frame.data[0];
    int keyframe = s->flags & FLAG_KEYFRAME;

    /* these variables are for managing the stream of macroblock change bits */
Michael Niedermayer's avatar
Michael Niedermayer committed
605
    const unsigned char *mb_change_bits = s->mb_change_bits;
606 607 608 609 610 611 612 613 614
    unsigned char mb_change_byte;
    unsigned char mb_change_byte_mask;
    int mb_change_index;

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

    /* clean out the line buffer */
615
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635

    GET_NEXT_INDEX();

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

        /* re-init variables for the next line iteration */
        horiz_pred = 0;
        current_pixel_pair = (unsigned int *)current_line;
        vert_pred = s->vert_pred;
        mb_change_index = 0;
        mb_change_byte = mb_change_bits[mb_change_index++];
        mb_change_byte_mask = 0x01;
        pixels_left = s->avctx->width;

        while (pixels_left > 0) {

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

                switch (y & 3) {
                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) {
639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                    } else {
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                    }
                    break;

                case 1:
                case 3:
                    /* always apply 2 Y predictors on these iterations */
                    APPLY_Y_PREDICTOR();
                    OUTPUT_PIXEL_PAIR();
                    APPLY_Y_PREDICTOR();
                    OUTPUT_PIXEL_PAIR();
                    break;

                case 2:
664
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689
                     * depending on the macroblock type */
                    if (s->block_type == BLOCK_2x2) {
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                    } else if (s->block_type == BLOCK_4x2) {
                        APPLY_C_PREDICTOR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                    } else {
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR();
                        OUTPUT_PIXEL_PAIR();
                    }
                    break;
                }

            } else {

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

696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718
            }

            if (!keyframe) {
                mb_change_byte_mask <<= 1;

                /* next byte */
                if (!mb_change_byte_mask) {
                    mb_change_byte = mb_change_bits[mb_change_index++];
                    mb_change_byte_mask = 0x01;
                }
            }

            pixels_left -= 4;
        }

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

        current_line += s->frame.linesize[0];
    }
}

719 720 721 722 723 724 725 726 727 728 729 730
static void truemotion1_decode_24bit(TrueMotion1Context *s)
{
    int y;
    int pixels_left;  /* remaining pixels on this line */
    unsigned int predictor_pair;
    unsigned int horiz_pred;
    unsigned int *vert_pred;
    unsigned int *current_pixel_pair;
    unsigned char *current_line = s->frame.data[0];
    int keyframe = s->flags & FLAG_KEYFRAME;

    /* these variables are for managing the stream of macroblock change bits */
Michael Niedermayer's avatar
Michael Niedermayer committed
731
    const unsigned char *mb_change_bits = s->mb_change_bits;
732 733 734 735 736 737 738 739 740
    unsigned char mb_change_byte;
    unsigned char mb_change_byte_mask;
    int mb_change_index;

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

    /* clean out the line buffer */
741
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
742 743 744 745 746 747

    GET_NEXT_INDEX();

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

        /* re-init variables for the next line iteration */
748
        horiz_pred = 0;
749 750 751 752 753 754 755 756 757 758 759 760 761
        current_pixel_pair = (unsigned int *)current_line;
        vert_pred = s->vert_pred;
        mb_change_index = 0;
        mb_change_byte = mb_change_bits[mb_change_index++];
        mb_change_byte_mask = 0x01;
        pixels_left = s->avctx->width;

        while (pixels_left > 0) {

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

                switch (y & 3) {
                case 0:
762
                    /* if macroblock width is 2, apply C-Y-C-Y; else
763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789
                     * apply C-Y-Y */
                    if (s->block_width == 2) {
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                    } else {
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                    }
                    break;

                case 1:
                case 3:
                    /* always apply 2 Y predictors on these iterations */
                    APPLY_Y_PREDICTOR_24();
                    OUTPUT_PIXEL_PAIR();
                    APPLY_Y_PREDICTOR_24();
                    OUTPUT_PIXEL_PAIR();
                    break;

                case 2:
790
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815
                     * depending on the macroblock type */
                    if (s->block_type == BLOCK_2x2) {
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                    } else if (s->block_type == BLOCK_4x2) {
                        APPLY_C_PREDICTOR_24();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                    } else {
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                        APPLY_Y_PREDICTOR_24();
                        OUTPUT_PIXEL_PAIR();
                    }
                    break;
                }

            } else {

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

822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845
            }

            if (!keyframe) {
                mb_change_byte_mask <<= 1;

                /* next byte */
                if (!mb_change_byte_mask) {
                    mb_change_byte = mb_change_bits[mb_change_index++];
                    mb_change_byte_mask = 0x01;
                }
            }

            pixels_left -= 4;
        }

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

        current_line += s->frame.linesize[0];
    }
}


846 847
static int truemotion1_decode_frame(AVCodecContext *avctx,
                                    void *data, int *data_size,
848
                                    AVPacket *avpkt)
849
{
850 851
    const uint8_t *buf = avpkt->data;
    int buf_size = avpkt->size;
852
    TrueMotion1Context *s = avctx->priv_data;
853 854 855 856 857 858 859

    s->buf = buf;
    s->size = buf_size;

    if (truemotion1_decode_header(s) == -1)
        return -1;

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

868
    if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
869
        truemotion1_decode_24bit(s);
870
    } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
871 872 873 874 875 876 877 878 879 880
        truemotion1_decode_16bit(s);
    }

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

    /* report that the buffer was completely consumed */
    return buf_size;
}

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

885 886
    if (s->frame.data[0])
        avctx->release_buffer(avctx, &s->frame);
887 888 889 890 891 892 893 894

    av_free(s->vert_pred);

    return 0;
}

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