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/*
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 * Duck TrueMotion 1.0 Decoder
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 * Copyright (C) 2003 Alex Beregszaszi & Mike Melanson
4
 *
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 * This library is free software; you can redistribute it and/or
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 * 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 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * 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 this library; 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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 */
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20
/**
21
 * @file truemotion1.c
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 * Duck TrueMotion v1 Video Decoder by
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 * Alex Beregszaszi (alex@fsn.hu) 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.
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 */
29

    
30
#include <stdio.h>
31
#include <stdlib.h>
32
#include <string.h>
33
#include <unistd.h>
34

    
35
#include "common.h"
36
#include "avcodec.h"
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#include "dsputil.h"
38

    
39
#include "truemotion1data.h"
40

    
41
typedef struct TrueMotion1Context {
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    AVCodecContext *avctx;
43
    AVFrame frame;
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    AVFrame prev_frame;
45

    
46
    uint8_t *buf;
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    int size;
48

    
49
    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;
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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];
61

    
62
    int compression;
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    int block_type;
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    int block_width;
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    int block_height;
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67
    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
79
#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 {
84
    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;
92
    uint8_t header_type;
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    uint8_t flags;
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    uint8_t control;
95
    uint16_t xoffset;
96
    uint16_t yoffset;
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    uint16_t width;
98
    uint16_t height;
99
};
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
110
#define BLOCK_4x4  3
111

    
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 },
125
    { ALGO_RGB16V, 4, 2, BLOCK_4x2 },
126
    { ALGO_RGB16H, 4, 2, BLOCK_4x2 },
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128
    { 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 },
136
    { 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 },
141
    { 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 = LE_16(&header_buffer[3]);
350
    header.xsize = LE_16(&header_buffer[5]);
351
    header.checksum = LE_16(&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
        s->w = header.width;
376
        s->h = header.height;
377
        s->x = header.xoffset;
378
        s->y = header.yoffset;
379
    } else {
380
        s->w = header.xsize;
381
        s->h = header.ysize;
382
        if (header.header_type < 2) {
383
            if ((s->w < 213) && (s->h >= 176))
384
            {
385
                s->flags |= FLAG_INTERPOLATED;
386
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
387
            }
388
        }
389
    }
390

    
391
    if (header.compression > 17) {
392
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
393
        return -1;
394
    }
395

    
396
    if ((header.deltaset != s->last_deltaset) ||
397
        (header.vectable != s->last_vectable))
398
        select_delta_tables(s, header.deltaset);
399

    
400
    if ((header.compression & 1) && header.header_type)
401
        sel_vector_table = pc_tbl2;
402
    else {
403
        if (header.vectable < 4)
404
            sel_vector_table = tables[header.vectable - 1];
405
        else {
406
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
407
            return -1;
408
        }
409
    }
410

    
411
    // FIXME: where to place this ?!?!
412
    if (compression_types[header.compression].algorithm == ALGO_RGB24H)
413
        s->avctx->pix_fmt = PIX_FMT_RGBA32;
414
    else
415
        s->avctx->pix_fmt = PIX_FMT_RGB555; // RGB565 is supported aswell
416

    
417
    if ((header.deltaset != s->last_deltaset) || (header.vectable != s->last_vectable))
418
    {
419
        if (compression_types[header.compression].algorithm == ALGO_RGB24H)
420
            gen_vector_table24(s, sel_vector_table);
421
        else
422
        if (s->avctx->pix_fmt == PIX_FMT_RGB555)
423
            gen_vector_table15(s, sel_vector_table);
424
        else
425
            gen_vector_table16(s, sel_vector_table);
426
    }
427

    
428
    /* set up pointers to the other key data chunks */
429
    s->mb_change_bits = s->buf + header.header_size;
430
    if (s->flags & FLAG_KEYFRAME) {
431
        /* no change bits specified for a keyframe; only index bytes */
432
        s->index_stream = s->mb_change_bits;
433
    } else {
434
        /* one change bit per 4x4 block */
435
        s->index_stream = s->mb_change_bits +
436
            (s->mb_change_bits_row_size * (s->avctx->height >> 2));
437
    }
438
    s->index_stream_size = s->size - (s->index_stream - s->buf);
439

    
440
    s->last_deltaset = header.deltaset;
441
    s->last_vectable = header.vectable;
442
    s->compression = header.compression;
443
    s->block_width = compression_types[header.compression].block_width;
444
    s->block_height = compression_types[header.compression].block_height;
445
    s->block_type = compression_types[header.compression].block_type;
446

    
447
    if (s->avctx->debug & FF_DEBUG_PICT_INFO)
448
        av_log(s->avctx, AV_LOG_INFO, "tables: %d / %d c:%d %dx%d t:%d %s%s%s%s\n",
449
            s->last_deltaset, s->last_vectable, s->compression, s->block_width,
450
            s->block_height, s->block_type,
451
            s->flags & FLAG_KEYFRAME ? " KEY" : "",
452
            s->flags & FLAG_INTERFRAME ? " INTER" : "",
453
            s->flags & FLAG_SPRITE ? " SPRITE" : "",
454
            s->flags & FLAG_INTERPOLATED ? " INTERPOL" : "");
455

    
456
    return header.header_size;
457
}
458

    
459
static int truemotion1_decode_init(AVCodecContext *avctx)
460
{
461
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
462

    
463
    s->avctx = avctx;
464

    
465
    // FIXME: it may change ?
466
//    if (avctx->bits_per_sample == 24)
467
//        avctx->pix_fmt = PIX_FMT_RGB24;
468
//    else
469
//        avctx->pix_fmt = PIX_FMT_RGB555;
470

    
471
    avctx->has_b_frames = 0;
472
    s->frame.data[0] = s->prev_frame.data[0] = NULL;
473

    
474
    /* there is a vertical predictor for each pixel in a line; each vertical
475
     * predictor is 0 to start with */
476
    s->vert_pred =
477
        (unsigned int *)av_malloc(s->avctx->width * sizeof(unsigned int));
478

    
479
    return 0;
480
}
481

    
482
/*
483
Block decoding order:
484

485
dxi: Y-Y
486
dxic: Y-C-Y
487
dxic2: Y-C-Y-C
488

489
hres,vres,i,i%vres (0 < i < 4)
490
2x2 0: 0 dxic2
491
2x2 1: 1 dxi
492
2x2 2: 0 dxic2
493
2x2 3: 1 dxi
494
2x4 0: 0 dxic2
495
2x4 1: 1 dxi
496
2x4 2: 2 dxi
497
2x4 3: 3 dxi
498
4x2 0: 0 dxic
499
4x2 1: 1 dxi
500
4x2 2: 0 dxic
501
4x2 3: 1 dxi
502
4x4 0: 0 dxic
503
4x4 1: 1 dxi
504
4x4 2: 2 dxi
505
4x4 3: 3 dxi
506
*/
507

    
508
#define GET_NEXT_INDEX() \
509
{\
510
    if (index_stream_index >= s->index_stream_size) { \
511
        av_log(s->avctx, AV_LOG_INFO, " help! truemotion1 decoder went out of bounds\n"); \
512
        return; \
513
    } \
514
    index = s->index_stream[index_stream_index++] * 4; \
515
}
516

    
517
#define APPLY_C_PREDICTOR() \
518
    predictor_pair = s->c_predictor_table[index]; \
519
    horiz_pred += (predictor_pair >> 1); \
520
    if (predictor_pair & 1) { \
521
        GET_NEXT_INDEX() \
522
        if (!index) { \
523
            GET_NEXT_INDEX() \
524
            predictor_pair = s->c_predictor_table[index]; \
525
            horiz_pred += ((predictor_pair >> 1) * 5); \
526
            if (predictor_pair & 1) \
527
                GET_NEXT_INDEX() \
528
            else \
529
                index++; \
530
        } \
531
    } else \
532
        index++;
533

    
534
#define APPLY_C_PREDICTOR_24() \
535
    predictor_pair = s->c_predictor_table[index]; \
536
    horiz_pred += (predictor_pair >> 1); \
537
    if (predictor_pair & 1) { \
538
        GET_NEXT_INDEX() \
539
        if (!index) { \
540
            GET_NEXT_INDEX() \
541
            predictor_pair = s->fat_c_predictor_table[index]; \
542
            horiz_pred += (predictor_pair >> 1); \
543
            if (predictor_pair & 1) \
544
                GET_NEXT_INDEX() \
545
            else \
546
                index++; \
547
        } \
548
    } else \
549
        index++;
550

    
551

    
552
#define APPLY_Y_PREDICTOR() \
553
    predictor_pair = s->y_predictor_table[index]; \
554
    horiz_pred += (predictor_pair >> 1); \
555
    if (predictor_pair & 1) { \
556
        GET_NEXT_INDEX() \
557
        if (!index) { \
558
            GET_NEXT_INDEX() \
559
            predictor_pair = s->y_predictor_table[index]; \
560
            horiz_pred += ((predictor_pair >> 1) * 5); \
561
            if (predictor_pair & 1) \
562
                GET_NEXT_INDEX() \
563
            else \
564
                index++; \
565
        } \
566
    } else \
567
        index++;
568

    
569
#define APPLY_Y_PREDICTOR_24() \
570
    predictor_pair = s->y_predictor_table[index]; \
571
    horiz_pred += (predictor_pair >> 1); \
572
    if (predictor_pair & 1) { \
573
        GET_NEXT_INDEX() \
574
        if (!index) { \
575
            GET_NEXT_INDEX() \
576
            predictor_pair = s->fat_y_predictor_table[index]; \
577
            horiz_pred += (predictor_pair >> 1); \
578
            if (predictor_pair & 1) \
579
                GET_NEXT_INDEX() \
580
            else \
581
                index++; \
582
        } \
583
    } else \
584
        index++;
585

    
586
#define OUTPUT_PIXEL_PAIR() \
587
    *current_pixel_pair = *vert_pred + horiz_pred; \
588
    *vert_pred++ = *current_pixel_pair++; \
589
    prev_pixel_pair++;
590

    
591
static void truemotion1_decode_16bit(TrueMotion1Context *s)
592
{
593
    int y;
594
    int pixels_left;  /* remaining pixels on this line */
595
    unsigned int predictor_pair;
596
    unsigned int horiz_pred;
597
    unsigned int *vert_pred;
598
    unsigned int *current_pixel_pair;
599
    unsigned int *prev_pixel_pair;
600
    unsigned char *current_line = s->frame.data[0];
601
    unsigned char *prev_line = s->prev_frame.data[0];
602
    int keyframe = s->flags & FLAG_KEYFRAME;
603

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

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

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

    
617
    GET_NEXT_INDEX();
618

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

    
621
        /* re-init variables for the next line iteration */
622
        horiz_pred = 0;
623
        current_pixel_pair = (unsigned int *)current_line;
624
        prev_pixel_pair = (unsigned int *)prev_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
                *current_pixel_pair = *prev_pixel_pair++;
694
                *vert_pred++ = *current_pixel_pair++;
695
                *current_pixel_pair = *prev_pixel_pair++;
696
                horiz_pred = *current_pixel_pair - *vert_pred;
697
                *vert_pred++ = *current_pixel_pair++;
698

    
699
            }
700

    
701
            if (!keyframe) {
702
                mb_change_byte_mask <<= 1;
703

    
704
                /* next byte */
705
                if (!mb_change_byte_mask) {
706
                    mb_change_byte = mb_change_bits[mb_change_index++];
707
                    mb_change_byte_mask = 0x01;
708
                }
709
            }
710

    
711
            pixels_left -= 4;
712
        }
713

    
714
        /* next change row */
715
        if (((y + 1) & 3) == 0)
716
            mb_change_bits += s->mb_change_bits_row_size;
717

    
718
        current_line += s->frame.linesize[0];
719
        prev_line += s->prev_frame.linesize[0];
720
    }
721
}
722

    
723
static void truemotion1_decode_24bit(TrueMotion1Context *s)
724
{
725
    int y;
726
    int pixels_left;  /* remaining pixels on this line */
727
    unsigned int predictor_pair;
728
    unsigned int horiz_pred;
729
    unsigned int *vert_pred;
730
    unsigned int *current_pixel_pair;
731
    unsigned int *prev_pixel_pair;
732
    unsigned char *current_line = s->frame.data[0];
733
    unsigned char *prev_line = s->prev_frame.data[0];
734
    int keyframe = s->flags & FLAG_KEYFRAME;
735

    
736
    /* these variables are for managing the stream of macroblock change bits */
737
    unsigned char *mb_change_bits = s->mb_change_bits;
738
    unsigned char mb_change_byte;
739
    unsigned char mb_change_byte_mask;
740
    int mb_change_index;
741

    
742
    /* these variables are for managing the main index stream */
743
    int index_stream_index = 0;  /* yes, the index into the index stream */
744
    int index;
745

    
746
    /* clean out the line buffer */
747
    memset(s->vert_pred, 0, s->avctx->width * sizeof(unsigned int));
748

    
749
    GET_NEXT_INDEX();
750

    
751
    for (y = 0; y < s->avctx->height; y++) {
752

    
753
        /* re-init variables for the next line iteration */
754
        horiz_pred = 0;
755
        current_pixel_pair = (unsigned int *)current_line;
756
        prev_pixel_pair = (unsigned int *)prev_line;
757
        vert_pred = s->vert_pred;
758
        mb_change_index = 0;
759
        mb_change_byte = mb_change_bits[mb_change_index++];
760
        mb_change_byte_mask = 0x01;
761
        pixels_left = s->avctx->width;
762

    
763
        while (pixels_left > 0) {
764

    
765
            if (keyframe || ((mb_change_byte & mb_change_byte_mask) == 0)) {
766

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

    
787
                case 1:
788
                case 3:
789
                    /* always apply 2 Y predictors on these iterations */
790
                    APPLY_Y_PREDICTOR_24();
791
                    OUTPUT_PIXEL_PAIR();
792
                    APPLY_Y_PREDICTOR_24();
793
                    OUTPUT_PIXEL_PAIR();
794
                    break;
795

    
796
                case 2:
797
                    /* this iteration might be C-Y-C-Y, Y-Y, or C-Y-Y
798
                     * depending on the macroblock type */
799
                    if (s->block_type == BLOCK_2x2) {
800
                        APPLY_C_PREDICTOR_24();
801
                        APPLY_Y_PREDICTOR_24();
802
                        OUTPUT_PIXEL_PAIR();
803
                        APPLY_C_PREDICTOR_24();
804
                        APPLY_Y_PREDICTOR_24();
805
                        OUTPUT_PIXEL_PAIR();
806
                    } else if (s->block_type == BLOCK_4x2) {
807
                        APPLY_C_PREDICTOR_24();
808
                        APPLY_Y_PREDICTOR_24();
809
                        OUTPUT_PIXEL_PAIR();
810
                        APPLY_Y_PREDICTOR_24();
811
                        OUTPUT_PIXEL_PAIR();
812
                    } else {
813
                        APPLY_Y_PREDICTOR_24();
814
                        OUTPUT_PIXEL_PAIR();
815
                        APPLY_Y_PREDICTOR_24();
816
                        OUTPUT_PIXEL_PAIR();
817
                    }
818
                    break;
819
                }
820

    
821
            } else {
822

    
823
                /* skip (copy) four pixels, but reassign the horizontal
824
                 * predictor */
825
                *current_pixel_pair = *prev_pixel_pair++;
826
                *vert_pred++ = *current_pixel_pair++;
827
                *current_pixel_pair = *prev_pixel_pair++;
828
                horiz_pred = *current_pixel_pair - *vert_pred;
829
                *vert_pred++ = *current_pixel_pair++;
830

    
831
            }
832

    
833
            if (!keyframe) {
834
                mb_change_byte_mask <<= 1;
835

    
836
                /* next byte */
837
                if (!mb_change_byte_mask) {
838
                    mb_change_byte = mb_change_bits[mb_change_index++];
839
                    mb_change_byte_mask = 0x01;
840
                }
841
            }
842

    
843
            pixels_left -= 4;
844
        }
845

    
846
        /* next change row */
847
        if (((y + 1) & 3) == 0)
848
            mb_change_bits += s->mb_change_bits_row_size;
849

    
850
        current_line += s->frame.linesize[0];
851
        prev_line += s->prev_frame.linesize[0];
852
    }
853
}
854

    
855

    
856
static int truemotion1_decode_frame(AVCodecContext *avctx,
857
                                    void *data, int *data_size,
858
                                    uint8_t *buf, int buf_size)
859
{
860
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
861

    
862
    s->buf = buf;
863
    s->size = buf_size;
864

    
865
    if (truemotion1_decode_header(s) == -1)
866
        return -1;
867

    
868
    s->frame.reference = 1;
869
    if (avctx->get_buffer(avctx, &s->frame) < 0) {
870
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
871
        return -1;
872
    }
873

    
874
    /* check for a do-nothing frame and copy the previous frame */
875
    if (compression_types[s->compression].algorithm == ALGO_NOP)
876
    {
877
        memcpy(s->frame.data[0], s->prev_frame.data[0],
878
            s->frame.linesize[0] * s->avctx->height);
879
    } else if (compression_types[s->compression].algorithm == ALGO_RGB24H) {
880
        truemotion1_decode_24bit(s);
881
    } else {
882
        truemotion1_decode_16bit(s);
883
    }
884

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

    
888
    /* shuffle frames */
889
    s->prev_frame = s->frame;
890

    
891
    *data_size = sizeof(AVFrame);
892
    *(AVFrame*)data = s->frame;
893

    
894
    /* report that the buffer was completely consumed */
895
    return buf_size;
896
}
897

    
898
static int truemotion1_decode_end(AVCodecContext *avctx)
899
{
900
    TrueMotion1Context *s = (TrueMotion1Context *)avctx->priv_data;
901

    
902
    /* release the last frame */
903
    if (s->prev_frame.data[0])
904
        avctx->release_buffer(avctx, &s->prev_frame);
905

    
906
    av_free(s->vert_pred);
907

    
908
    return 0;
909
}
910

    
911
AVCodec truemotion1_decoder = {
912
    "truemotion1",
913
    CODEC_TYPE_VIDEO,
914
    CODEC_ID_TRUEMOTION1,
915
    sizeof(TrueMotion1Context),
916
    truemotion1_decode_init,
917
    NULL,
918
    truemotion1_decode_end,
919
    truemotion1_decode_frame,
920
    CODEC_CAP_DR1,
921
};