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1
/*
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 * Duck/ON2 TrueMotion 2 Decoder
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 * Copyright (c) 2005 Konstantin Shishkov
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 *
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 * This file is part of FFmpeg.
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 *
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 * FFmpeg 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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 * FFmpeg 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 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 libavcodec/truemotion2.c
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 * Duck TrueMotion2 decoder.
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 */
26

    
27
#include "avcodec.h"
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#include "get_bits.h"
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#include "dsputil.h"
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31
#define TM2_ESCAPE 0x80000000
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#define TM2_DELTAS 64
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/* Huffman-coded streams of different types of blocks */
34
enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
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     TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
36
/* Block types */
37
enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
38
                 TM2_UPDATE, TM2_STILL, TM2_MOTION};
39

    
40
typedef struct TM2Context{
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    AVCodecContext *avctx;
42
    AVFrame pic;
43

    
44
    GetBitContext gb;
45
    DSPContext dsp;
46

    
47
    /* TM2 streams */
48
    int *tokens[TM2_NUM_STREAMS];
49
    int tok_lens[TM2_NUM_STREAMS];
50
    int tok_ptrs[TM2_NUM_STREAMS];
51
    int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
52
    /* for blocks decoding */
53
    int D[4];
54
    int CD[4];
55
    int *last;
56
    int *clast;
57

    
58
    /* data for current and previous frame */
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    int *Y1, *U1, *V1, *Y2, *U2, *V2;
60
    int cur;
61
} TM2Context;
62

    
63
/**
64
* Huffman codes for each of streams
65
*/
66
typedef struct TM2Codes{
67
    VLC vlc; ///< table for FFmpeg bitstream reader
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    int bits;
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    int *recode; ///< table for converting from code indexes to values
70
    int length;
71
} TM2Codes;
72

    
73
/**
74
* structure for gathering Huffman codes information
75
*/
76
typedef struct TM2Huff{
77
    int val_bits; ///< length of literal
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    int max_bits; ///< maximum length of code
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    int min_bits; ///< minimum length of code
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    int nodes; ///< total number of nodes in tree
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    int num; ///< current number filled
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    int max_num; ///< total number of codes
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    int *nums; ///< literals
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    uint32_t *bits; ///< codes
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    int *lens; ///< codelengths
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} TM2Huff;
87

    
88
static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
89
{
90
    if(length > huff->max_bits) {
91
        av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
92
        return -1;
93
    }
94

    
95
    if(!get_bits1(&ctx->gb)) { /* literal */
96
        if (length == 0) {
97
            length = 1;
98
        }
99
        if(huff->num >= huff->max_num) {
100
            av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
101
            return -1;
102
        }
103
        huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
104
        huff->bits[huff->num] = prefix;
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        huff->lens[huff->num] = length;
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        huff->num++;
107
        return 0;
108
    } else { /* non-terminal node */
109
        if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
110
            return -1;
111
        if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
112
            return -1;
113
    }
114
    return 0;
115
}
116

    
117
static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
118
{
119
    TM2Huff huff;
120
    int res = 0;
121

    
122
    huff.val_bits = get_bits(&ctx->gb, 5);
123
    huff.max_bits = get_bits(&ctx->gb, 5);
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    huff.min_bits = get_bits(&ctx->gb, 5);
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    huff.nodes = get_bits_long(&ctx->gb, 17);
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    huff.num = 0;
127

    
128
    /* check for correct codes parameters */
129
    if((huff.val_bits < 1) || (huff.val_bits > 32) ||
130
       (huff.max_bits < 0) || (huff.max_bits > 32)) {
131
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
132
               huff.val_bits, huff.max_bits);
133
        return -1;
134
    }
135
    if((huff.nodes < 0) || (huff.nodes > 0x10000)) {
136
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
137
        return -1;
138
    }
139
    /* one-node tree */
140
    if(huff.max_bits == 0)
141
        huff.max_bits = 1;
142

    
143
    /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
144
    huff.max_num = (huff.nodes + 1) >> 1;
145
    huff.nums = av_mallocz(huff.max_num * sizeof(int));
146
    huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
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    huff.lens = av_mallocz(huff.max_num * sizeof(int));
148

    
149
    if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
150
        res = -1;
151

    
152
    if(huff.num != huff.max_num) {
153
        av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
154
               huff.num, huff.max_num);
155
        res = -1;
156
    }
157

    
158
    /* convert codes to vlc_table */
159
    if(res != -1) {
160
        int i;
161

    
162
        res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
163
                    huff.lens, sizeof(int), sizeof(int),
164
                    huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
165
        if(res < 0) {
166
            av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
167
            res = -1;
168
        } else
169
            res = 0;
170
        if(res != -1) {
171
            code->bits = huff.max_bits;
172
            code->length = huff.max_num;
173
            code->recode = av_malloc(code->length * sizeof(int));
174
            for(i = 0; i < code->length; i++)
175
                code->recode[i] = huff.nums[i];
176
        }
177
    }
178
    /* free allocated memory */
179
    av_free(huff.nums);
180
    av_free(huff.bits);
181
    av_free(huff.lens);
182

    
183
    return res;
184
}
185

    
186
static void tm2_free_codes(TM2Codes *code)
187
{
188
    if(code->recode)
189
        av_free(code->recode);
190
    if(code->vlc.table)
191
        free_vlc(&code->vlc);
192
}
193

    
194
static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
195
{
196
    int val;
197
    val = get_vlc2(gb, code->vlc.table, code->bits, 1);
198
    return code->recode[val];
199
}
200

    
201
static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
202
{
203
    uint32_t magic;
204
    const uint8_t *obuf;
205
    int length;
206

    
207
    obuf = buf;
208

    
209
    magic = AV_RL32(buf);
210
    buf += 4;
211

    
212
    if(magic == 0x00000100) { /* old header */
213
/*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
214
        return 40;
215
    } else if(magic == 0x00000101) { /* new header */
216
        int w, h, size, flags, xr, yr;
217

    
218
        length = AV_RL32(buf);
219
        buf += 4;
220

    
221
        init_get_bits(&ctx->gb, buf, 32 * 8);
222
        size = get_bits_long(&ctx->gb, 31);
223
        h = get_bits(&ctx->gb, 15);
224
        w = get_bits(&ctx->gb, 15);
225
        flags = get_bits_long(&ctx->gb, 31);
226
        yr = get_bits(&ctx->gb, 9);
227
        xr = get_bits(&ctx->gb, 9);
228

    
229
        return 40;
230
    } else {
231
        av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
232
        return -1;
233
    }
234

    
235
    return buf - obuf;
236
}
237

    
238
static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
239
    int d, mb;
240
    int i, v;
241

    
242
    d = get_bits(&ctx->gb, 9);
243
    mb = get_bits(&ctx->gb, 5);
244

    
245
    if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
246
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
247
        return -1;
248
    }
249

    
250
    for(i = 0; i < d; i++) {
251
        v = get_bits_long(&ctx->gb, mb);
252
        if(v & (1 << (mb - 1)))
253
            ctx->deltas[stream_id][i] = v - (1 << mb);
254
        else
255
            ctx->deltas[stream_id][i] = v;
256
    }
257
    for(; i < TM2_DELTAS; i++)
258
        ctx->deltas[stream_id][i] = 0;
259

    
260
    return 0;
261
}
262

    
263
static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id) {
264
    int i;
265
    int cur = 0;
266
    int skip = 0;
267
    int len, toks;
268
    TM2Codes codes;
269

    
270
    /* get stream length in dwords */
271
    len = AV_RB32(buf); buf += 4; cur += 4;
272
    skip = len * 4 + 4;
273

    
274
    if(len == 0)
275
        return 4;
276

    
277
    toks = AV_RB32(buf); buf += 4; cur += 4;
278
    if(toks & 1) {
279
        len = AV_RB32(buf); buf += 4; cur += 4;
280
        if(len == TM2_ESCAPE) {
281
            len = AV_RB32(buf); buf += 4; cur += 4;
282
        }
283
        if(len > 0) {
284
            init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
285
            if(tm2_read_deltas(ctx, stream_id) == -1)
286
                return -1;
287
            buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
288
            cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
289
        }
290
    }
291
    /* skip unused fields */
292
    if(AV_RB32(buf) == TM2_ESCAPE) {
293
        buf += 4; cur += 4; /* some unknown length - could be escaped too */
294
    }
295
    buf += 4; cur += 4;
296
    buf += 4; cur += 4; /* unused by decoder */
297

    
298
    init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
299
    if(tm2_build_huff_table(ctx, &codes) == -1)
300
        return -1;
301
    buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
302
    cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
303

    
304
    toks >>= 1;
305
    /* check if we have sane number of tokens */
306
    if((toks < 0) || (toks > 0xFFFFFF)){
307
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
308
        tm2_free_codes(&codes);
309
        return -1;
310
    }
311
    ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
312
    ctx->tok_lens[stream_id] = toks;
313
    len = AV_RB32(buf); buf += 4; cur += 4;
314
    if(len > 0) {
315
        init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
316
        for(i = 0; i < toks; i++)
317
            ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
318
    } else {
319
        for(i = 0; i < toks; i++)
320
            ctx->tokens[stream_id][i] = codes.recode[0];
321
    }
322
    tm2_free_codes(&codes);
323

    
324
    return skip;
325
}
326

    
327
static inline int GET_TOK(TM2Context *ctx,int type) {
328
    if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
329
        av_log(ctx->avctx, AV_LOG_ERROR, "Read token from stream %i out of bounds (%i>=%i)\n", type, ctx->tok_ptrs[type], ctx->tok_lens[type]);
330
        return 0;
331
    }
332
    if(type <= TM2_MOT)
333
        return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
334
    return ctx->tokens[type][ctx->tok_ptrs[type]++];
335
}
336

    
337
/* blocks decoding routines */
338

    
339
/* common Y, U, V pointers initialisation */
340
#define TM2_INIT_POINTERS() \
341
    int *last, *clast; \
342
    int *Y, *U, *V;\
343
    int Ystride, Ustride, Vstride;\
344
\
345
    Ystride = ctx->avctx->width;\
346
    Vstride = (ctx->avctx->width + 1) >> 1;\
347
    Ustride = (ctx->avctx->width + 1) >> 1;\
348
    Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
349
    V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
350
    U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
351
    last = ctx->last + bx * 4;\
352
    clast = ctx->clast + bx * 4;
353

    
354
#define TM2_INIT_POINTERS_2() \
355
    int *Yo, *Uo, *Vo;\
356
    int oYstride, oUstride, oVstride;\
357
\
358
    TM2_INIT_POINTERS();\
359
    oYstride = Ystride;\
360
    oVstride = Vstride;\
361
    oUstride = Ustride;\
362
    Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
363
    Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
364
    Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
365

    
366
/* recalculate last and delta values for next blocks */
367
#define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
368
    CD[0] = (CHR[1] - 128) - last[1];\
369
    CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
370
    last[0] = (int)CHR[stride + 0] - 128;\
371
    last[1] = (int)CHR[stride + 1] - 128;}
372

    
373
/* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
374
static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
375
{
376
    int ct, d;
377
    int i, j;
378

    
379
    for(j = 0; j < 4; j++){
380
        ct = ctx->D[j];
381
        for(i = 0; i < 4; i++){
382
            d = deltas[i + j * 4];
383
            ct += d;
384
            last[i] += ct;
385
            Y[i] = av_clip_uint8(last[i]);
386
        }
387
        Y += stride;
388
        ctx->D[j] = ct;
389
    }
390
}
391

    
392
static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
393
{
394
    int i, j;
395
    for(j = 0; j < 2; j++){
396
        for(i = 0; i < 2; i++){
397
            CD[j] += deltas[i + j * 2];
398
            last[i] += CD[j];
399
            data[i] = last[i] + 128;
400
        }
401
        data += stride;
402
    }
403
}
404

    
405
static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
406
{
407
    int t;
408
    int l;
409
    int prev;
410

    
411
    if(bx > 0)
412
        prev = clast[-3];
413
    else
414
        prev = 0;
415
    t = (CD[0] + CD[1]) >> 1;
416
    l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
417
    CD[1] = CD[0] + CD[1] - t;
418
    CD[0] = t;
419
    clast[0] = l;
420

    
421
    tm2_high_chroma(data, stride, clast, CD, deltas);
422
}
423

    
424
static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
425
{
426
    int i;
427
    int deltas[16];
428
    TM2_INIT_POINTERS();
429

    
430
    /* hi-res chroma */
431
    for(i = 0; i < 4; i++) {
432
        deltas[i] = GET_TOK(ctx, TM2_C_HI);
433
        deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
434
    }
435
    tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
436
    tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
437

    
438
    /* hi-res luma */
439
    for(i = 0; i < 16; i++)
440
        deltas[i] = GET_TOK(ctx, TM2_L_HI);
441

    
442
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
443
}
444

    
445
static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
446
{
447
    int i;
448
    int deltas[16];
449
    TM2_INIT_POINTERS();
450

    
451
    /* low-res chroma */
452
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
453
    deltas[1] = deltas[2] = deltas[3] = 0;
454
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
455

    
456
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
457
    deltas[1] = deltas[2] = deltas[3] = 0;
458
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
459

    
460
    /* hi-res luma */
461
    for(i = 0; i < 16; i++)
462
        deltas[i] = GET_TOK(ctx, TM2_L_HI);
463

    
464
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
465
}
466

    
467
static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
468
{
469
    int i;
470
    int t1, t2;
471
    int deltas[16];
472
    TM2_INIT_POINTERS();
473

    
474
    /* low-res chroma */
475
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
476
    deltas[1] = deltas[2] = deltas[3] = 0;
477
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
478

    
479
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
480
    deltas[1] = deltas[2] = deltas[3] = 0;
481
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
482

    
483
    /* low-res luma */
484
    for(i = 0; i < 16; i++)
485
        deltas[i] = 0;
486

    
487
    deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
488
    deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
489
    deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
490
    deltas[10] = GET_TOK(ctx, TM2_L_LO);
491

    
492
    if(bx > 0)
493
        last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
494
    else
495
        last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
496
    last[2] = (last[1] + last[3]) >> 1;
497

    
498
    t1 = ctx->D[0] + ctx->D[1];
499
    ctx->D[0] = t1 >> 1;
500
    ctx->D[1] = t1 - (t1 >> 1);
501
    t2 = ctx->D[2] + ctx->D[3];
502
    ctx->D[2] = t2 >> 1;
503
    ctx->D[3] = t2 - (t2 >> 1);
504

    
505
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
506
}
507

    
508
static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
509
{
510
    int i;
511
    int ct;
512
    int left, right, diff;
513
    int deltas[16];
514
    TM2_INIT_POINTERS();
515

    
516
    /* null chroma */
517
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
518
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
519

    
520
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
521
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
522

    
523
    /* null luma */
524
    for(i = 0; i < 16; i++)
525
        deltas[i] = 0;
526

    
527
    ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
528

    
529
    if(bx > 0)
530
        left = last[-1] - ct;
531
    else
532
        left = 0;
533

    
534
    right = last[3];
535
    diff = right - left;
536
    last[0] = left + (diff >> 2);
537
    last[1] = left + (diff >> 1);
538
    last[2] = right - (diff >> 2);
539
    last[3] = right;
540
    {
541
        int tp = left;
542

    
543
        ctx->D[0] = (tp + (ct >> 2)) - left;
544
        left += ctx->D[0];
545
        ctx->D[1] = (tp + (ct >> 1)) - left;
546
        left += ctx->D[1];
547
        ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
548
        left += ctx->D[2];
549
        ctx->D[3] = (tp + ct) - left;
550
    }
551
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
552
}
553

    
554
static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
555
{
556
    int i, j;
557
    TM2_INIT_POINTERS_2();
558

    
559
    /* update chroma */
560
    for(j = 0; j < 2; j++){
561
        for(i = 0; i < 2; i++){
562
            U[i] = Uo[i];
563
            V[i] = Vo[i];
564
        }
565
        U += Ustride; V += Vstride;
566
        Uo += oUstride; Vo += oVstride;
567
    }
568
    U -= Ustride * 2;
569
    V -= Vstride * 2;
570
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
571
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
572

    
573
    /* update deltas */
574
    ctx->D[0] = Yo[3] - last[3];
575
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
576
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
577
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
578

    
579
    for(j = 0; j < 4; j++){
580
        for(i = 0; i < 4; i++){
581
            Y[i] = Yo[i];
582
            last[i] = Yo[i];
583
        }
584
        Y += Ystride;
585
        Yo += oYstride;
586
    }
587
}
588

    
589
static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
590
{
591
    int i, j;
592
    int d;
593
    TM2_INIT_POINTERS_2();
594

    
595
    /* update chroma */
596
    for(j = 0; j < 2; j++){
597
        for(i = 0; i < 2; i++){
598
            U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
599
            V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
600
        }
601
        U += Ustride; V += Vstride;
602
        Uo += oUstride; Vo += oVstride;
603
    }
604
    U -= Ustride * 2;
605
    V -= Vstride * 2;
606
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
607
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
608

    
609
    /* update deltas */
610
    ctx->D[0] = Yo[3] - last[3];
611
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
612
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
613
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
614

    
615
    for(j = 0; j < 4; j++){
616
        d = last[3];
617
        for(i = 0; i < 4; i++){
618
            Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
619
            last[i] = Y[i];
620
        }
621
        ctx->D[j] = last[3] - d;
622
        Y += Ystride;
623
        Yo += oYstride;
624
    }
625
}
626

    
627
static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
628
{
629
    int i, j;
630
    int mx, my;
631
    TM2_INIT_POINTERS_2();
632

    
633
    mx = GET_TOK(ctx, TM2_MOT);
634
    my = GET_TOK(ctx, TM2_MOT);
635

    
636
    Yo += my * oYstride + mx;
637
    Uo += (my >> 1) * oUstride + (mx >> 1);
638
    Vo += (my >> 1) * oVstride + (mx >> 1);
639

    
640
    /* copy chroma */
641
    for(j = 0; j < 2; j++){
642
        for(i = 0; i < 2; i++){
643
            U[i] = Uo[i];
644
            V[i] = Vo[i];
645
        }
646
        U += Ustride; V += Vstride;
647
        Uo += oUstride; Vo += oVstride;
648
    }
649
    U -= Ustride * 2;
650
    V -= Vstride * 2;
651
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
652
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
653

    
654
    /* copy luma */
655
    for(j = 0; j < 4; j++){
656
        for(i = 0; i < 4; i++){
657
            Y[i] = Yo[i];
658
        }
659
        Y += Ystride;
660
        Yo += oYstride;
661
    }
662
    /* calculate deltas */
663
    Y -= Ystride * 4;
664
    ctx->D[0] = Y[3] - last[3];
665
    ctx->D[1] = Y[3 + Ystride] - Y[3];
666
    ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
667
    ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
668
    for(i = 0; i < 4; i++)
669
        last[i] = Y[i + Ystride * 3];
670
}
671

    
672
static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
673
{
674
    int i, j;
675
    int bw, bh;
676
    int type;
677
    int keyframe = 1;
678
    uint8_t *Y, *U, *V;
679
    int *src;
680

    
681
    bw = ctx->avctx->width >> 2;
682
    bh = ctx->avctx->height >> 2;
683

    
684
    for(i = 0; i < TM2_NUM_STREAMS; i++)
685
        ctx->tok_ptrs[i] = 0;
686

    
687
    if (ctx->tok_lens[TM2_TYPE]<bw*bh){
688
        av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
689
        return -1;
690
    }
691

    
692
    memset(ctx->last, 0, 4 * bw * sizeof(int));
693
    memset(ctx->clast, 0, 4 * bw * sizeof(int));
694

    
695
    for(j = 0; j < bh; j++) {
696
        memset(ctx->D, 0, 4 * sizeof(int));
697
        memset(ctx->CD, 0, 4 * sizeof(int));
698
        for(i = 0; i < bw; i++) {
699
            type = GET_TOK(ctx, TM2_TYPE);
700
            switch(type) {
701
            case TM2_HI_RES:
702
                tm2_hi_res_block(ctx, p, i, j);
703
                break;
704
            case TM2_MED_RES:
705
                tm2_med_res_block(ctx, p, i, j);
706
                break;
707
            case TM2_LOW_RES:
708
                tm2_low_res_block(ctx, p, i, j);
709
                break;
710
            case TM2_NULL_RES:
711
                tm2_null_res_block(ctx, p, i, j);
712
                break;
713
            case TM2_UPDATE:
714
                tm2_update_block(ctx, p, i, j);
715
                keyframe = 0;
716
                break;
717
            case TM2_STILL:
718
                tm2_still_block(ctx, p, i, j);
719
                keyframe = 0;
720
                break;
721
            case TM2_MOTION:
722
                tm2_motion_block(ctx, p, i, j);
723
                keyframe = 0;
724
                break;
725
            default:
726
                av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
727
            }
728
        }
729
    }
730

    
731
    /* copy data from our buffer to AVFrame */
732
    Y = p->data[0];
733
    src = (ctx->cur?ctx->Y2:ctx->Y1);
734
    for(j = 0; j < ctx->avctx->height; j++){
735
        for(i = 0; i < ctx->avctx->width; i++){
736
            Y[i] = av_clip_uint8(*src++);
737
        }
738
        Y += p->linesize[0];
739
    }
740
    U = p->data[2];
741
    src = (ctx->cur?ctx->U2:ctx->U1);
742
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
743
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
744
            U[i] = av_clip_uint8(*src++);
745
        }
746
        U += p->linesize[2];
747
    }
748
    V = p->data[1];
749
    src = (ctx->cur?ctx->V2:ctx->V1);
750
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
751
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
752
            V[i] = av_clip_uint8(*src++);
753
        }
754
        V += p->linesize[1];
755
    }
756

    
757
    return keyframe;
758
}
759

    
760
static const int tm2_stream_order[TM2_NUM_STREAMS] = {
761
    TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
762
};
763

    
764
static int decode_frame(AVCodecContext *avctx,
765
                        void *data, int *data_size,
766
                        AVPacket *avpkt)
767
{
768
    const uint8_t *buf = avpkt->data;
769
    int buf_size = avpkt->size;
770
    TM2Context * const l = avctx->priv_data;
771
    AVFrame * const p= (AVFrame*)&l->pic;
772
    int i, skip, t;
773
    uint8_t *swbuf;
774

    
775
    swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
776
    if(!swbuf){
777
        av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
778
        return -1;
779
    }
780
    p->reference = 1;
781
    p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
782
    if(avctx->reget_buffer(avctx, p) < 0){
783
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
784
        av_free(swbuf);
785
        return -1;
786
    }
787

    
788
    l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
789
    skip = tm2_read_header(l, swbuf);
790

    
791
    if(skip == -1){
792
        av_free(swbuf);
793
        return -1;
794
    }
795

    
796
    for(i = 0; i < TM2_NUM_STREAMS; i++){
797
        t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i]);
798
        if(t == -1){
799
            av_free(swbuf);
800
            return -1;
801
        }
802
        skip += t;
803
    }
804
    p->key_frame = tm2_decode_blocks(l, p);
805
    if(p->key_frame)
806
        p->pict_type = FF_I_TYPE;
807
    else
808
        p->pict_type = FF_P_TYPE;
809

    
810
    l->cur = !l->cur;
811
    *data_size = sizeof(AVFrame);
812
    *(AVFrame*)data = l->pic;
813
    av_free(swbuf);
814

    
815
    return buf_size;
816
}
817

    
818
static av_cold int decode_init(AVCodecContext *avctx){
819
    TM2Context * const l = avctx->priv_data;
820
    int i;
821

    
822
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
823
        return -1;
824
    }
825
    if((avctx->width & 3) || (avctx->height & 3)){
826
        av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
827
        return -1;
828
    }
829

    
830
    l->avctx = avctx;
831
    l->pic.data[0]=NULL;
832
    avctx->pix_fmt = PIX_FMT_YUV420P;
833

    
834
    dsputil_init(&l->dsp, avctx);
835

    
836
    l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
837
    l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
838

    
839
    for(i = 0; i < TM2_NUM_STREAMS; i++) {
840
        l->tokens[i] = NULL;
841
        l->tok_lens[i] = 0;
842
    }
843

    
844
    l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
845
    l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
846
    l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
847
    l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
848
    l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
849
    l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
850
    l->cur = 0;
851

    
852
    return 0;
853
}
854

    
855
static av_cold int decode_end(AVCodecContext *avctx){
856
    TM2Context * const l = avctx->priv_data;
857
    int i;
858

    
859
    if(l->last)
860
        av_free(l->last);
861
    if(l->clast)
862
        av_free(l->clast);
863
    for(i = 0; i < TM2_NUM_STREAMS; i++)
864
        if(l->tokens[i])
865
            av_free(l->tokens[i]);
866
    if(l->Y1){
867
        av_free(l->Y1);
868
        av_free(l->U1);
869
        av_free(l->V1);
870
        av_free(l->Y2);
871
        av_free(l->U2);
872
        av_free(l->V2);
873
    }
874
    return 0;
875
}
876

    
877
AVCodec truemotion2_decoder = {
878
    "truemotion2",
879
    CODEC_TYPE_VIDEO,
880
    CODEC_ID_TRUEMOTION2,
881
    sizeof(TM2Context),
882
    decode_init,
883
    NULL,
884
    decode_end,
885
    decode_frame,
886
    CODEC_CAP_DR1,
887
    .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
888
};