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1
/*
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 * 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
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 * 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
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 * 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
/**
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 * @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>
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#include <unistd.h>
36

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

    
40
#include "truemotion1data.h"
41

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

    
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    uint8_t *buf;
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    int size;
48

    
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    uint8_t *mb_change_bits;
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    int mb_change_bits_row_size;
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    uint8_t *index_stream;
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    int index_stream_size;
53

    
54
    int flags;
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    int x, y, w, h;
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57
    uint32_t y_predictor_table[1024];
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    uint32_t c_predictor_table[1024];
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    uint32_t fat_y_predictor_table[1024];
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    uint32_t fat_c_predictor_table[1024];
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62
    int compression;
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    int block_type;
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    int block_width;
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    int block_height;
66

    
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    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];
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    int last_deltaset, last_vectable;
73

    
74
    unsigned int *vert_pred;
75

    
76
} TrueMotion1Context;
77

    
78
#define FLAG_SPRITE         32
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#define FLAG_KEYFRAME       16
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#define FLAG_INTERFRAME      8
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#define FLAG_INTERPOLATED    4
82

    
83
struct frame_header {
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    uint8_t header_size;
85
    uint8_t compression;
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    uint8_t deltaset;
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    uint8_t vectable;
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    uint16_t ysize;
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    uint16_t xsize;
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    uint16_t checksum;
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    uint8_t version;
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    uint8_t header_type;
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    uint8_t flags;
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    uint8_t control;
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    uint16_t xoffset;
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    uint16_t yoffset;
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    uint16_t width;
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    uint16_t height;
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};
100

    
101
#define ALGO_NOP        0
102
#define ALGO_RGB16V     1
103
#define ALGO_RGB16H     2
104
#define ALGO_RGB24H     3
105

    
106
/* these are the various block sizes that can occupy a 4x4 block */
107
#define BLOCK_2x2  0
108
#define BLOCK_2x4  1
109
#define BLOCK_4x2  2
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#define BLOCK_4x4  3
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112
typedef struct comp_types {
113
    int algorithm;
114
    int block_width; // vres
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    int block_height; // hres
116
    int block_type;
117
} comp_types;
118

    
119
/* { valid for metatype }, algorithm, num of deltas, vert res, horiz res */
120
static comp_types compression_types[17] = {
121
    { ALGO_NOP,    0, 0, 0 },
122

    
123
    { ALGO_RGB16V, 4, 4, BLOCK_4x4 },
124
    { ALGO_RGB16H, 4, 4, BLOCK_4x4 },
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    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
126
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
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    { ALGO_RGB16V, 2, 4, BLOCK_2x4 },
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    { ALGO_RGB16H, 2, 4, BLOCK_2x4 },
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    { ALGO_RGB16V, 2, 2, BLOCK_2x2 },
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    { ALGO_RGB16H, 2, 2, BLOCK_2x2 },
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133
    { ALGO_NOP,    4, 4, BLOCK_4x4 },
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    { ALGO_RGB24H, 4, 4, BLOCK_4x4 },
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    { ALGO_NOP,    4, 2, BLOCK_4x2 },
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    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
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138
    { ALGO_NOP,    2, 4, BLOCK_2x4 },
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    { ALGO_RGB24H, 2, 4, BLOCK_2x4 },
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    { ALGO_NOP,    2, 2, BLOCK_2x2 },
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    { ALGO_RGB24H, 2, 2, BLOCK_2x2 }
142
};
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144
static void select_delta_tables(TrueMotion1Context *s, int delta_table_index)
145
{
146
    int i;
147

    
148
    if (delta_table_index > 3)
149
        return;
150

    
151
    memcpy(s->ydt, ydts[delta_table_index], 8 * sizeof(int16_t));
152
    memcpy(s->cdt, cdts[delta_table_index], 8 * sizeof(int16_t));
153
    memcpy(s->fat_ydt, fat_ydts[delta_table_index], 8 * sizeof(int16_t));
154
    memcpy(s->fat_cdt, fat_cdts[delta_table_index], 8 * sizeof(int16_t));
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156
    /* Y skinny deltas need to be halved for some reason; maybe the
157
     * skinny Y deltas should be modified */
158
    for (i = 0; i < 8; i++)
159
    {
160
        /* drop the lsb before dividing by 2-- net effect: round down
161
         * when dividing a negative number (e.g., -3/2 = -2, not -1) */
162
        s->ydt[i] &= 0xFFFE;
163
        s->ydt[i] /= 2;
164
    }
165
}
166

    
167
#ifdef WORDS_BIGENDIAN
168
static int make_ydt15_entry(int p2, int p1, int16_t *ydt)
169
#else
170
static int make_ydt15_entry(int p1, int p2, int16_t *ydt)
171
#endif
172
{
173
    int lo, hi;
174

    
175
    lo = ydt[p1];
176
    lo += (lo << 5) + (lo << 10);
177
    hi = ydt[p2];
178
    hi += (hi << 5) + (hi << 10);
179
    return ((lo + (hi << 16)) << 1);
180
}
181

    
182
#ifdef WORDS_BIGENDIAN
183
static int make_cdt15_entry(int p2, int p1, int16_t *cdt)
184
#else
185
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
186
#endif
187
{
188
    int r, b, lo;
189

    
190
    b = cdt[p2];
191
    r = cdt[p1] << 10;
192
    lo = b + r;
193
    return ((lo + (lo << 16)) << 1);
194
}
195

    
196
#ifdef WORDS_BIGENDIAN
197
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
198
#else
199
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
200
#endif
201
{
202
    int lo, hi;
203

    
204
    lo = ydt[p1];
205
    lo += (lo << 6) + (lo << 11);
206
    hi = ydt[p2];
207
    hi += (hi << 6) + (hi << 11);
208
    return ((lo + (hi << 16)) << 1);
209
}
210

    
211
#ifdef WORDS_BIGENDIAN
212
static int make_cdt16_entry(int p2, int p1, int16_t *cdt)
213
#else
214
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
215
#endif
216
{
217
    int r, b, lo;
218

    
219
    b = cdt[p2];
220
    r = cdt[p1] << 11;
221
    lo = b + r;
222
    return ((lo + (lo << 16)) << 1);
223
}
224

    
225
#ifdef WORDS_BIGENDIAN
226
static int make_ydt24_entry(int p2, int p1, int16_t *ydt)
227
#else
228
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
229
#endif
230
{
231
    int lo, hi;
232

    
233
    lo = ydt[p1];
234
    hi = ydt[p2];
235
    return ((lo + (hi << 8) + (hi << 16)) << 1);
236
}
237

    
238
#ifdef WORDS_BIGENDIAN
239
static int make_cdt24_entry(int p2, int p1, int16_t *cdt)
240
#else
241
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
242
#endif
243
{
244
    int r, b;
245

    
246
    b = cdt[p2];
247
    r = cdt[p1]<<16;
248
    return ((b+r) << 1);
249
}
250

    
251
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
252
{
253
    int len, i, j;
254
    unsigned char delta_pair;
255

    
256
    for (i = 0; i < 1024; i += 4)
257
    {
258
        len = *sel_vector_table++ / 2;
259
        for (j = 0; j < len; j++)
260
        {
261
            delta_pair = *sel_vector_table++;
262
            s->y_predictor_table[i+j] = 0xfffffffe &
263
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
264
            s->c_predictor_table[i+j] = 0xfffffffe &
265
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
266
        }
267
        s->y_predictor_table[i+(j-1)] |= 1;
268
        s->c_predictor_table[i+(j-1)] |= 1;
269
    }
270
}
271

    
272
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
273
{
274
    int len, i, j;
275
    unsigned char delta_pair;
276

    
277
    for (i = 0; i < 1024; i += 4)
278
    {
279
        len = *sel_vector_table++ / 2;
280
        for (j = 0; j < len; j++)
281
        {
282
            delta_pair = *sel_vector_table++;
283
            s->y_predictor_table[i+j] = 0xfffffffe &
284
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
285
            s->c_predictor_table[i+j] = 0xfffffffe &
286
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
287
        }
288
        s->y_predictor_table[i+(j-1)] |= 1;
289
        s->c_predictor_table[i+(j-1)] |= 1;
290
    }
291
}
292

    
293
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
294
{
295
    int len, i, j;
296
    unsigned char delta_pair;
297

    
298
    for (i = 0; i < 1024; i += 4)
299
    {
300
        len = *sel_vector_table++ / 2;
301
        for (j = 0; j < len; j++)
302
        {
303
            delta_pair = *sel_vector_table++;
304
            s->y_predictor_table[i+j] = 0xfffffffe &
305
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
306
            s->c_predictor_table[i+j] = 0xfffffffe &
307
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
308
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
309
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
310
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
311
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
312
        }
313
        s->y_predictor_table[i+(j-1)] |= 1;
314
        s->c_predictor_table[i+(j-1)] |= 1;
315
        s->fat_y_predictor_table[i+(j-1)] |= 1;
316
        s->fat_c_predictor_table[i+(j-1)] |= 1;
317
    }
318
}
319

    
320
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
321
 * there was an error while decoding the header */
322
static int truemotion1_decode_header(TrueMotion1Context *s)
323
{
324
    int i;
325
    struct frame_header header;
326
    uint8_t header_buffer[128];  /* logical maximum size of the header */
327
    const uint8_t *sel_vector_table;
328

    
329
    /* There is 1 change bit per 4 pixels, so each change byte represents
330
     * 32 pixels; divide width by 4 to obtain the number of change bits and
331
     * then round up to the nearest byte. */
332
    s->mb_change_bits_row_size = ((s->avctx->width >> 2) + 7) >> 3;
333

    
334
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
335
    if (s->buf[0] < 0x10)
336
    {
337
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
338
        return -1;
339
    }
340

    
341
    /* unscramble the header bytes with a XOR operation */
342
    memset(header_buffer, 0, 128);
343
    for (i = 1; i < header.header_size; i++)
344
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
345

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

    
357
    /* Version 2 */
358
    if (header.version >= 2)
359
    {
360
        if (header.header_type > 3)
361
        {
362
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
363
            return -1;
364
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
365
            s->flags = header.flags;
366
            if (!(s->flags & FLAG_INTERFRAME))
367
                s->flags |= FLAG_KEYFRAME;
368
        } else
369
            s->flags = FLAG_KEYFRAME;
370
    } else /* Version 1 */
371
        s->flags = FLAG_KEYFRAME;
372

    
373
    if (s->flags & FLAG_SPRITE) {
374
        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
375
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
376
#if 0
377
        s->w = header.width;
378
        s->h = header.height;
379
        s->x = header.xoffset;
380
        s->y = header.yoffset;
381
#else
382
        return -1;
383
#endif
384
    } else {
385
        s->w = header.xsize;
386
        s->h = header.ysize;
387
        if (header.header_type < 2) {
388
            if ((s->w < 213) && (s->h >= 176))
389
            {
390
                s->flags |= FLAG_INTERPOLATED;
391
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
392
            }
393
        }
394
    }
395

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

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

    
405
    if ((header.compression & 1) && header.header_type)
406
        sel_vector_table = pc_tbl2;
407
    else {
408
        if (header.vectable < 4)
409
            sel_vector_table = tables[header.vectable - 1];
410
        else {
411
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
412
            return -1;
413
        }
414
    }
415

    
416
    // FIXME: where to place this ?!?!
417
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
418
        s->avctx->pix_fmt = PIX_FMT_RGB32;
419
    else
420
        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
421

    
422
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
423
    {
424
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
425
            gen_vector_table24(s, sel_vector_table);
426
        else
427
        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
428
            gen_vector_table15(s, sel_vector_table);
429
        else
430
            gen_vector_table16(s, sel_vector_table);
431
    }
432

    
433
    /* set up pointers to the other key data chunks */
434
    s->mb_change_bits = s->buf + header.header_size;
435
    if (s->flags & FLAG_KEYFRAME) {
436
        /* no change bits specified for a keyframe; only index bytes */
437
        s->index_stream = s->mb_change_bits;
438
    } else {
439
        /* one change bit per 4x4 block */
440
        s->index_stream = s->mb_change_bits +
441
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
442
    }
443
    s->index_stream_size = s->size - (s->index_stream - s->buf);
444

    
445
    s->last_deltaset = header.deltaset;
446
    s->last_vectable = header.vectable;
447
    s->compression = header.compression;
448
    s->block_width = compression_types[header.compression].block_width;
449
    s->block_height = compression_types[header.compression].block_height;
450
    s->block_type = compression_types[header.compression].block_type;
451

    
452
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
453
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
454
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
455
            s->block_height, s->block_type,
456
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
457
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
458
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
459
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
460

    
461
    return header.header_size;
462
}
463

    
464
static int truemotion1_decode_init(AVCodecContext *avctx)
465
{
466
    TrueMotion1Context *s = avctx->priv_data;
467

    
468
    s->avctx = avctx;
469

    
470
    // FIXME: it may change ?
471
//    if (avctx->bits_per_sample == 24)
472
//        avctx->pix_fmt = PIX_FMT_RGB24;
473
//    else
474
//        avctx->pix_fmt = PIX_FMT_RGB555;
475

    
476
    s->frame.data[0] = NULL;
477

    
478
    /* there is a vertical predictor for each pixel in a line; each vertical
479
     * predictor is 0 to start with */
480
    s->vert_pred =
481
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
482

    
483
    return 0;
484
}
485

    
486
/*
487
Block decoding order:
488

489
dxi: Y-Y
490
dxic: Y-C-Y
491
dxic2: Y-C-Y-C
492

493
hres,vres,i,i%vres (0 < i < 4)
494
2x2 0: 0 dxic2
495
2x2 1: 1 dxi
496
2x2 2: 0 dxic2
497
2x2 3: 1 dxi
498
2x4 0: 0 dxic2
499
2x4 1: 1 dxi
500
2x4 2: 2 dxi
501
2x4 3: 3 dxi
502
4x2 0: 0 dxic
503
4x2 1: 1 dxi
504
4x2 2: 0 dxic
505
4x2 3: 1 dxi
506
4x4 0: 0 dxic
507
4x4 1: 1 dxi
508
4x4 2: 2 dxi
509
4x4 3: 3 dxi
510
*/
511

    
512
#define GET_NEXT_INDEX() \
513
{\
514
    if (index_stream_index >= s->index_stream_size) { \
515
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
516
        return; \
517
    } \
518
    index = s->index_stream[index_stream_index++] * 4; \
519
}
520

    
521
#define APPLY_C_PREDICTOR() \
522
    predictor_pair = s->c_predictor_table[index]; \
523
    horiz_pred += (predictor_pair >> 1); \
524
    if (predictor_pair & 1) { \
525
        GET_NEXT_INDEX() \
526
        if (!index) { \
527
            GET_NEXT_INDEX() \
528
            predictor_pair = s->c_predictor_table[index]; \
529
            horiz_pred += ((predictor_pair >> 1) * 5); \
530
            if (predictor_pair & 1) \
531
                GET_NEXT_INDEX() \
532
            else \
533
                index++; \
534
        } \
535
    } else \
536
        index++;
537

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

    
555

    
556
#define APPLY_Y_PREDICTOR() \
557
    predictor_pair = s->y_predictor_table[index]; \
558
    horiz_pred += (predictor_pair >> 1); \
559
    if (predictor_pair & 1) { \
560
        GET_NEXT_INDEX() \
561
        if (!index) { \
562
            GET_NEXT_INDEX() \
563
            predictor_pair = s->y_predictor_table[index]; \
564
            horiz_pred += ((predictor_pair >> 1) * 5); \
565
            if (predictor_pair & 1) \
566
                GET_NEXT_INDEX() \
567
            else \
568
                index++; \
569
        } \
570
    } else \
571
        index++;
572

    
573
#define APPLY_Y_PREDICTOR_24() \
574
    predictor_pair = s->y_predictor_table[index]; \
575
    horiz_pred += (predictor_pair >> 1); \
576
    if (predictor_pair & 1) { \
577
        GET_NEXT_INDEX() \
578
        if (!index) { \
579
            GET_NEXT_INDEX() \
580
            predictor_pair = s->fat_y_predictor_table[index]; \
581
            horiz_pred += (predictor_pair >> 1); \
582
            if (predictor_pair & 1) \
583
                GET_NEXT_INDEX() \
584
            else \
585
                index++; \
586
        } \
587
    } else \
588
        index++;
589

    
590
#define OUTPUT_PIXEL_PAIR() \
591
    *current_pixel_pair = *vert_pred + horiz_pred; \
592
    *vert_pred++ = *current_pixel_pair++;
593

    
594
static void truemotion1_decode_16bit(TrueMotion1Context *s)
595
{
596
    int y;
597
    int pixels_left;  /* remaining pixels on this line */
598
    unsigned int predictor_pair;
599
    unsigned int horiz_pred;
600
    unsigned int *vert_pred;
601
    unsigned int *current_pixel_pair;
602
    unsigned char *current_line = s->frame.data[0];
603
    int keyframe = s->flags & FLAG_KEYFRAME;
604

    
605
    /* these variables are for managing the stream of macroblock change bits */
606
    unsigned char *mb_change_bits = s->mb_change_bits;
607
    unsigned char mb_change_byte;
608
    unsigned char mb_change_byte_mask;
609
    int mb_change_index;
610

    
611
    /* these variables are for managing the main index stream */
612
    int index_stream_index = 0;  /* yes, the index into the index stream */
613
    int index;
614

    
615
    /* clean out the line buffer */
616
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
617

    
618
    GET_NEXT_INDEX();
619

    
620
    for (y = 0; y < s->avctx->height; y++) {
621

    
622
        /* re-init variables for the next line iteration */
623
        horiz_pred = 0;
624
        current_pixel_pair = (unsigned int *)current_line;
625
        vert_pred = s->vert_pred;
626
        mb_change_index = 0;
627
        mb_change_byte = mb_change_bits[mb_change_index++];
628
        mb_change_byte_mask = 0x01;
629
        pixels_left = s->avctx->width;
630

    
631
        while (pixels_left > 0) {
632

    
633
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
634

    
635
                switch (y & 3) {
636
                case 0:
637
                    /* if macroblock width is 2, apply C-Y-C-Y; else
638
                     * apply C-Y-Y */
639
                    if (s->block_width == 2) {
640
                        APPLY_C_PREDICTOR();
641
                        APPLY_Y_PREDICTOR();
642
                        OUTPUT_PIXEL_PAIR();
643
                        APPLY_C_PREDICTOR();
644
                        APPLY_Y_PREDICTOR();
645
                        OUTPUT_PIXEL_PAIR();
646
                    } else {
647
                        APPLY_C_PREDICTOR();
648
                        APPLY_Y_PREDICTOR();
649
                        OUTPUT_PIXEL_PAIR();
650
                        APPLY_Y_PREDICTOR();
651
                        OUTPUT_PIXEL_PAIR();
652
                    }
653
                    break;
654

    
655
                case 1:
656
                case 3:
657
                    /* always apply 2 Y predictors on these iterations */
658
                    APPLY_Y_PREDICTOR();
659
                    OUTPUT_PIXEL_PAIR();
660
                    APPLY_Y_PREDICTOR();
661
                    OUTPUT_PIXEL_PAIR();
662
                    break;
663

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

    
689
            } else {
690

    
691
                /* skip (copy) four pixels, but reassign the horizontal
692
                 * predictor */
693
                *vert_pred++ = *current_pixel_pair++;
694
                horiz_pred = *current_pixel_pair - *vert_pred;
695
                *vert_pred++ = *current_pixel_pair++;
696

    
697
            }
698

    
699
            if (!keyframe) {
700
                mb_change_byte_mask <<= 1;
701

    
702
                /* next byte */
703
                if (!mb_change_byte_mask) {
704
                    mb_change_byte = mb_change_bits[mb_change_index++];
705
                    mb_change_byte_mask = 0x01;
706
                }
707
            }
708

    
709
            pixels_left -= 4;
710
        }
711

    
712
        /* next change row */
713
        if (((y + 1) & 3) == 0)
714
            mb_change_bits += s->mb_change_bits_row_size;
715

    
716
        current_line += s->frame.linesize[0];
717
    }
718
}
719

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

    
731
    /* these variables are for managing the stream of macroblock change bits */
732
    unsigned char *mb_change_bits = s->mb_change_bits;
733
    unsigned char mb_change_byte;
734
    unsigned char mb_change_byte_mask;
735
    int mb_change_index;
736

    
737
    /* these variables are for managing the main index stream */
738
    int index_stream_index = 0;  /* yes, the index into the index stream */
739
    int index;
740

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

    
744
    GET_NEXT_INDEX();
745

    
746
    for (y = 0; y < s->avctx->height; y++) {
747

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

    
757
        while (pixels_left > 0) {
758

    
759
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
760

    
761
                switch (y & 3) {
762
                case 0:
763
                    /* if macroblock width is 2, apply C-Y-C-Y; else
764
                     * apply C-Y-Y */
765
                    if (s->block_width == 2) {
766
                        APPLY_C_PREDICTOR_24();
767
                        APPLY_Y_PREDICTOR_24();
768
                        OUTPUT_PIXEL_PAIR();
769
                        APPLY_C_PREDICTOR_24();
770
                        APPLY_Y_PREDICTOR_24();
771
                        OUTPUT_PIXEL_PAIR();
772
                    } else {
773
                        APPLY_C_PREDICTOR_24();
774
                        APPLY_Y_PREDICTOR_24();
775
                        OUTPUT_PIXEL_PAIR();
776
                        APPLY_Y_PREDICTOR_24();
777
                        OUTPUT_PIXEL_PAIR();
778
                    }
779
                    break;
780

    
781
                case 1:
782
                case 3:
783
                    /* always apply 2 Y predictors on these iterations */
784
                    APPLY_Y_PREDICTOR_24();
785
                    OUTPUT_PIXEL_PAIR();
786
                    APPLY_Y_PREDICTOR_24();
787
                    OUTPUT_PIXEL_PAIR();
788
                    break;
789

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

    
815
            } else {
816

    
817
                /* skip (copy) four pixels, but reassign the horizontal
818
                 * predictor */
819
                *vert_pred++ = *current_pixel_pair++;
820
                horiz_pred = *current_pixel_pair - *vert_pred;
821
                *vert_pred++ = *current_pixel_pair++;
822

    
823
            }
824

    
825
            if (!keyframe) {
826
                mb_change_byte_mask <<= 1;
827

    
828
                /* next byte */
829
                if (!mb_change_byte_mask) {
830
                    mb_change_byte = mb_change_bits[mb_change_index++];
831
                    mb_change_byte_mask = 0x01;
832
                }
833
            }
834

    
835
            pixels_left -= 4;
836
        }
837

    
838
        /* next change row */
839
        if (((y + 1) & 3) == 0)
840
            mb_change_bits += s->mb_change_bits_row_size;
841

    
842
        current_line += s->frame.linesize[0];
843
    }
844
}
845

    
846

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

    
853
    s->buf = buf;
854
    s->size = buf_size;
855

    
856
    if (truemotion1_decode_header(s) == -1)
857
        return -1;
858

    
859
    s->frame.reference = 1;
860
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
861
        FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
862
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
863
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
864
        return -1;
865
    }
866

    
867
    if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
868
        truemotion1_decode_24bit(s);
869
    } else if (compression_types[s->compression].algorithm != ALGO_NOP) {
870
        truemotion1_decode_16bit(s);
871
    }
872

    
873
    *data_size = sizeof(AVFrame);
874
    *(AVFrame*)data = s->frame;
875

    
876
    /* report that the buffer was completely consumed */
877
    return buf_size;
878
}
879

    
880
static int truemotion1_decode_end(AVCodecContext *avctx)
881
{
882
    TrueMotion1Context *s = avctx->priv_data;
883

    
884
    if (s->frame.data[0])
885
        avctx->release_buffer(avctx, &s->frame);
886

    
887
    av_free(s->vert_pred);
888

    
889
    return 0;
890
}
891

    
892
AVCodec truemotion1_decoder = {
893
    "truemotion1",
894
    CODEC_TYPE_VIDEO,
895
    CODEC_ID_TRUEMOTION1,
896
    sizeof(TrueMotion1Context),
897
    truemotion1_decode_init,
898
    NULL,
899
    truemotion1_decode_end,
900
    truemotion1_decode_frame,
901
    CODEC_CAP_DR1,
902
};