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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
 *
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 * This file is part of Libav.
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 *
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 * Libav 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 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav 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 Libav; 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

    
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/**
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 * @file
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 * Duck TrueMotion v1 Video Decoder by
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 * Alex Beregszaszi and
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 * Mike Melanson (melanson@pcisys.net)
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 *
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 * The TrueMotion v1 decoder presently only decodes 16-bit TM1 data and
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 * outputs RGB555 (or RGB565) data. 24-bit TM1 data is not supported yet.
30
 */
31

    
32
#include <stdio.h>
33
#include <stdlib.h>
34
#include <string.h>
35

    
36
#include "avcodec.h"
37
#include "dsputil.h"
38
#include "libavutil/imgutils.h"
39

    
40
#include "truemotion1data.h"
41

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

    
46
    const uint8_t *buf;
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    int size;
48

    
49
    const uint8_t *mb_change_bits;
50
    int mb_change_bits_row_size;
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    const uint8_t *index_stream;
52
    int index_stream_size;
53

    
54
    int flags;
55
    int x, y, w, h;
56

    
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;
63
    int block_type;
64
    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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72
    int last_deltaset, last_vectable;
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74
    unsigned int *vert_pred;
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    int vert_pred_size;
76

    
77
} TrueMotion1Context;
78

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

    
84
struct frame_header {
85
    uint8_t header_size;
86
    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;
91
    uint16_t checksum;
92
    uint8_t version;
93
    uint8_t header_type;
94
    uint8_t flags;
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    uint8_t control;
96
    uint16_t xoffset;
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    uint16_t yoffset;
98
    uint16_t width;
99
    uint16_t height;
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};
101

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

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

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

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

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

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

    
134
    { 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 },
137
    { ALGO_RGB24H, 4, 2, BLOCK_4x2 },
138

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

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

    
149
    if (delta_table_index > 3)
150
        return;
151

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

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

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

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

    
183
static int make_cdt15_entry(int p1, int p2, int16_t *cdt)
184
{
185
    int r, b, lo;
186

    
187
    b = cdt[p2];
188
    r = cdt[p1] << 10;
189
    lo = b + r;
190
    return (lo + (lo << 16)) << 1;
191
}
192

    
193
#if HAVE_BIGENDIAN
194
static int make_ydt16_entry(int p2, int p1, int16_t *ydt)
195
#else
196
static int make_ydt16_entry(int p1, int p2, int16_t *ydt)
197
#endif
198
{
199
    int lo, hi;
200

    
201
    lo = ydt[p1];
202
    lo += (lo << 6) + (lo << 11);
203
    hi = ydt[p2];
204
    hi += (hi << 6) + (hi << 11);
205
    return (lo + (hi << 16)) << 1;
206
}
207

    
208
static int make_cdt16_entry(int p1, int p2, int16_t *cdt)
209
{
210
    int r, b, lo;
211

    
212
    b = cdt[p2];
213
    r = cdt[p1] << 11;
214
    lo = b + r;
215
    return (lo + (lo << 16)) << 1;
216
}
217

    
218
static int make_ydt24_entry(int p1, int p2, int16_t *ydt)
219
{
220
    int lo, hi;
221

    
222
    lo = ydt[p1];
223
    hi = ydt[p2];
224
    return (lo + (hi << 8) + (hi << 16)) << 1;
225
}
226

    
227
static int make_cdt24_entry(int p1, int p2, int16_t *cdt)
228
{
229
    int r, b;
230

    
231
    b = cdt[p2];
232
    r = cdt[p1]<<16;
233
    return (b+r) << 1;
234
}
235

    
236
static void gen_vector_table15(TrueMotion1Context *s, const uint8_t *sel_vector_table)
237
{
238
    int len, i, j;
239
    unsigned char delta_pair;
240

    
241
    for (i = 0; i < 1024; i += 4)
242
    {
243
        len = *sel_vector_table++ / 2;
244
        for (j = 0; j < len; j++)
245
        {
246
            delta_pair = *sel_vector_table++;
247
            s->y_predictor_table[i+j] = 0xfffffffe &
248
                make_ydt15_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
249
            s->c_predictor_table[i+j] = 0xfffffffe &
250
                make_cdt15_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
251
        }
252
        s->y_predictor_table[i+(j-1)] |= 1;
253
        s->c_predictor_table[i+(j-1)] |= 1;
254
    }
255
}
256

    
257
static void gen_vector_table16(TrueMotion1Context *s, const uint8_t *sel_vector_table)
258
{
259
    int len, i, j;
260
    unsigned char delta_pair;
261

    
262
    for (i = 0; i < 1024; i += 4)
263
    {
264
        len = *sel_vector_table++ / 2;
265
        for (j = 0; j < len; j++)
266
        {
267
            delta_pair = *sel_vector_table++;
268
            s->y_predictor_table[i+j] = 0xfffffffe &
269
                make_ydt16_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
270
            s->c_predictor_table[i+j] = 0xfffffffe &
271
                make_cdt16_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
272
        }
273
        s->y_predictor_table[i+(j-1)] |= 1;
274
        s->c_predictor_table[i+(j-1)] |= 1;
275
    }
276
}
277

    
278
static void gen_vector_table24(TrueMotion1Context *s, const uint8_t *sel_vector_table)
279
{
280
    int len, i, j;
281
    unsigned char delta_pair;
282

    
283
    for (i = 0; i < 1024; i += 4)
284
    {
285
        len = *sel_vector_table++ / 2;
286
        for (j = 0; j < len; j++)
287
        {
288
            delta_pair = *sel_vector_table++;
289
            s->y_predictor_table[i+j] = 0xfffffffe &
290
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->ydt);
291
            s->c_predictor_table[i+j] = 0xfffffffe &
292
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->cdt);
293
            s->fat_y_predictor_table[i+j] = 0xfffffffe &
294
                make_ydt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_ydt);
295
            s->fat_c_predictor_table[i+j] = 0xfffffffe &
296
                make_cdt24_entry(delta_pair >> 4, delta_pair & 0xf, s->fat_cdt);
297
        }
298
        s->y_predictor_table[i+(j-1)] |= 1;
299
        s->c_predictor_table[i+(j-1)] |= 1;
300
        s->fat_y_predictor_table[i+(j-1)] |= 1;
301
        s->fat_c_predictor_table[i+(j-1)] |= 1;
302
    }
303
}
304

    
305
/* Returns the number of bytes consumed from the bytestream. Returns -1 if
306
 * there was an error while decoding the header */
307
static int truemotion1_decode_header(TrueMotion1Context *s)
308
{
309
    int i;
310
    int width_shift = 0;
311
    int new_pix_fmt;
312
    struct frame_header header;
313
    uint8_t header_buffer[128];  /* logical maximum size of the header */
314
    const uint8_t *sel_vector_table;
315

    
316
    header.header_size = ((s->buf[0] >> 5) | (s->buf[0] << 3)) & 0x7f;
317
    if (s->buf[0] < 0x10)
318
    {
319
        av_log(s->avctx, AV_LOG_ERROR, "invalid header size (%d)\n", s->buf[0]);
320
        return -1;
321
    }
322

    
323
    /* unscramble the header bytes with a XOR operation */
324
    memset(header_buffer, 0, 128);
325
    for (i = 1; i < header.header_size; i++)
326
        header_buffer[i - 1] = s->buf[i] ^ s->buf[i + 1];
327

    
328
    header.compression = header_buffer[0];
329
    header.deltaset = header_buffer[1];
330
    header.vectable = header_buffer[2];
331
    header.ysize = AV_RL16(&header_buffer[3]);
332
    header.xsize = AV_RL16(&header_buffer[5]);
333
    header.checksum = AV_RL16(&header_buffer[7]);
334
    header.version = header_buffer[9];
335
    header.header_type = header_buffer[10];
336
    header.flags = header_buffer[11];
337
    header.control = header_buffer[12];
338

    
339
    /* Version 2 */
340
    if (header.version >= 2)
341
    {
342
        if (header.header_type > 3)
343
        {
344
            av_log(s->avctx, AV_LOG_ERROR, "invalid header type (%d)\n", header.header_type);
345
            return -1;
346
        } else if ((header.header_type == 2) || (header.header_type == 3)) {
347
            s->flags = header.flags;
348
            if (!(s->flags & FLAG_INTERFRAME))
349
                s->flags |= FLAG_KEYFRAME;
350
        } else
351
            s->flags = FLAG_KEYFRAME;
352
    } else /* Version 1 */
353
        s->flags = FLAG_KEYFRAME;
354

    
355
    if (s->flags & FLAG_SPRITE) {
356
        av_log(s->avctx, AV_LOG_INFO, "SPRITE frame found, please report the sample to the developers\n");
357
        /* FIXME header.width, height, xoffset and yoffset aren't initialized */
358
#if 0
359
        s->w = header.width;
360
        s->h = header.height;
361
        s->x = header.xoffset;
362
        s->y = header.yoffset;
363
#else
364
        return -1;
365
#endif
366
    } else {
367
        s->w = header.xsize;
368
        s->h = header.ysize;
369
        if (header.header_type < 2) {
370
            if ((s->w < 213) && (s->h >= 176))
371
            {
372
                s->flags |= FLAG_INTERPOLATED;
373
                av_log(s->avctx, AV_LOG_INFO, "INTERPOLATION selected, please report the sample to the developers\n");
374
            }
375
        }
376
    }
377

    
378
    if (header.compression >= 17) {
379
        av_log(s->avctx, AV_LOG_ERROR, "invalid compression type (%d)\n", header.compression);
380
        return -1;
381
    }
382

    
383
    if ((header.deltaset != s->last_deltaset) ||
384
        (header.vectable != s->last_vectable))
385
        select_delta_tables(s, header.deltaset);
386

    
387
    if ((header.compression & 1) && header.header_type)
388
        sel_vector_table = pc_tbl2;
389
    else {
390
        if (header.vectable > 0 && header.vectable < 4)
391
            sel_vector_table = tables[header.vectable - 1];
392
        else {
393
            av_log(s->avctx, AV_LOG_ERROR, "invalid vector table id (%d)\n", header.vectable);
394
            return -1;
395
        }
396
    }
397

    
398
    if (compression_types[header.compression].algorithm == ALGO_RGB24H) {
399
        new_pix_fmt = PIX_FMT_RGB32;
400
        width_shift = 1;
401
    } else
402
        new_pix_fmt = PIX_FMT_RGB555; // RGB565 is supported as well
403

    
404
    s->w >>= width_shift;
405
    if (av_image_check_size(s->w, s->h, 0, s->avctx) < 0)
406
        return -1;
407

    
408
    if (s->w != s->avctx->width || s->h != s->avctx->height ||
409
        new_pix_fmt != s->avctx->pix_fmt) {
410
        if (s->frame.data[0])
411
            s->avctx->release_buffer(s->avctx, &s->frame);
412
        s->avctx->sample_aspect_ratio = (AVRational){ 1 << width_shift, 1 };
413
        s->avctx->pix_fmt = new_pix_fmt;
414
        avcodec_set_dimensions(s->avctx, s->w, s->h);
415
        av_fast_malloc(&s->vert_pred, &s->vert_pred_size, s->avctx->width * sizeof(unsigned int));
416
    }
417

    
418
    /* There is 1 change bit per 4 pixels, so each change byte represents
419
     * 32 pixels; divide width by 4 to obtain the number of change bits and
420
     * then round up to the nearest byte. */
421
    s->mb_change_bits_row_size = ((s->avctx->width >> (2 - width_shift)) + 7) >> 3;
422

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

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

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

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

    
462
    return header.header_size;
463
}
464

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

    
469
    s->avctx = avctx;
470

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

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

    
479
    /* there is a vertical predictor for each pixel in a line; each vertical
480
     * predictor is 0 to start with */
481
    av_fast_malloc(&s->vert_pred, &s->vert_pred_size, 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
    const 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
    const 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 -= 2;
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
                                    AVPacket *avpkt)
850
{
851
    const uint8_t *buf = avpkt->data;
852
    int buf_size = avpkt->size;
853
    TrueMotion1Context *s = avctx->priv_data;
854

    
855
    s->buf = buf;
856
    s->size = buf_size;
857

    
858
    if (truemotion1_decode_header(s) == -1)
859
        return -1;
860

    
861
    s->frame.reference = 1;
862
    s->frame.buffer_hints = FF_BUFFER_HINTS_VALID |
863
        FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
864
    if (avctx->reget_buffer(avctx, &s->frame) < 0) {
865
        av_log(s->avctx, AV_LOG_ERROR, "get_buffer() failed\n");
866
        return -1;
867
    }
868

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

    
875
    *data_size = sizeof(AVFrame);
876
    *(AVFrame*)data = s->frame;
877

    
878
    /* report that the buffer was completely consumed */
879
    return buf_size;
880
}
881

    
882
static av_cold int truemotion1_decode_end(AVCodecContext *avctx)
883
{
884
    TrueMotion1Context *s = avctx->priv_data;
885

    
886
    if (s->frame.data[0])
887
        avctx->release_buffer(avctx, &s->frame);
888

    
889
    av_free(s->vert_pred);
890

    
891
    return 0;
892
}
893

    
894
AVCodec ff_truemotion1_decoder = {
895
    "truemotion1",
896
    AVMEDIA_TYPE_VIDEO,
897
    CODEC_ID_TRUEMOTION1,
898
    sizeof(TrueMotion1Context),
899
    truemotion1_decode_init,
900
    NULL,
901
    truemotion1_decode_end,
902
    truemotion1_decode_frame,
903
    CODEC_CAP_DR1,
904
    .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 1.0"),
905
};