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ffmpeg / libavcodec / truemotion2.c @ f66e4f5f

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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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 *
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 */
22

    
23
/**
24
 * @file truemotion2.c
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 * Duck TrueMotion2 decoder.
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 */
27

    
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#include "avcodec.h"
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#include "common.h"
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#include "bitstream.h"
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#include "dsputil.h"
32

    
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#define TM2_ESCAPE 0x80000000
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#define TM2_DELTAS 64
35
/* Huffman-coded streams of different types of blocks */
36
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};
38
/* Block types */
39
enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
40
                 TM2_UPDATE, TM2_STILL, TM2_MOTION};
41

    
42
typedef struct TM2Context{
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    AVCodecContext *avctx;
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    AVFrame pic;
45

    
46
    GetBitContext gb;
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    DSPContext dsp;
48

    
49
    /* TM2 streams */
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    int *tokens[TM2_NUM_STREAMS];
51
    int tok_lens[TM2_NUM_STREAMS];
52
    int tok_ptrs[TM2_NUM_STREAMS];
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    int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
54
    /* for blocks decoding */
55
    int D[4];
56
    int CD[4];
57
    int *last;
58
    int *clast;
59

    
60
    /* data for current and previous frame */
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    int *Y1, *U1, *V1, *Y2, *U2, *V2;
62
    int cur;
63
} TM2Context;
64

    
65
/**
66
* Huffman codes for each of streams
67
*/
68
typedef struct TM2Codes{
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    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
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    int length;
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} TM2Codes;
74

    
75
/**
76
* structure for gathering Huffman codes information
77
*/
78
typedef struct TM2Huff{
79
    int val_bits; ///< length of literal
80
    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;
89

    
90
static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
91
{
92
    if(length > huff->max_bits) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
94
        return -1;
95
    }
96

    
97
    if(!get_bits1(&ctx->gb)) { /* literal */
98
        if (length == 0) {
99
            length = 1;
100
        }
101
        if(huff->num >= huff->max_num) {
102
            av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
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            return -1;
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        }
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        huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
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        huff->bits[huff->num] = prefix;
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        huff->lens[huff->num] = length;
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        huff->num++;
109
        return 0;
110
    } else { /* non-terminal node */
111
        if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
112
            return -1;
113
        if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
114
            return -1;
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    }
116
    return 0;
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}
118

    
119
static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
120
{
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    TM2Huff huff;
122
    int res = 0;
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    huff.val_bits = get_bits(&ctx->gb, 5);
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    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;
129

    
130
    /* check for correct codes parameters */
131
    if((huff.val_bits < 1) || (huff.val_bits > 32) ||
132
       (huff.max_bits < 0) || (huff.max_bits > 32)) {
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        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
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               huff.val_bits, huff.max_bits);
135
        return -1;
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    }
137
    if((huff.nodes < 0) || (huff.nodes > 0x10000)) {
138
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
139
        return -1;
140
    }
141
    /* one-node tree */
142
    if(huff.max_bits == 0)
143
        huff.max_bits = 1;
144

    
145
    /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
146
    huff.max_num = (huff.nodes + 1) >> 1;
147
    huff.nums = av_mallocz(huff.max_num * sizeof(int));
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    huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
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    huff.lens = av_mallocz(huff.max_num * sizeof(int));
150

    
151
    if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
152
        res = -1;
153

    
154
    if(huff.num != huff.max_num) {
155
        av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
156
               huff.num, huff.max_num);
157
        res = -1;
158
    }
159

    
160
    /* convert codes to vlc_table */
161
    if(res != -1) {
162
        int i;
163

    
164
        res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
165
                    huff.lens, sizeof(int), sizeof(int),
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                    huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
167
        if(res < 0) {
168
            av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
169
            res = -1;
170
        } else
171
            res = 0;
172
        if(res != -1) {
173
            code->bits = huff.max_bits;
174
            code->length = huff.max_num;
175
            code->recode = av_malloc(code->length * sizeof(int));
176
            for(i = 0; i < code->length; i++)
177
                code->recode[i] = huff.nums[i];
178
        }
179
    }
180
    /* free allocated memory */
181
    av_free(huff.nums);
182
    av_free(huff.bits);
183
    av_free(huff.lens);
184

    
185
    return res;
186
}
187

    
188
static void tm2_free_codes(TM2Codes *code)
189
{
190
    if(code->recode)
191
        av_free(code->recode);
192
    if(code->vlc.table)
193
        free_vlc(&code->vlc);
194
}
195

    
196
static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
197
{
198
    int val;
199
    val = get_vlc2(gb, code->vlc.table, code->bits, 1);
200
    return code->recode[val];
201
}
202

    
203
static inline int tm2_read_header(TM2Context *ctx, uint8_t *buf)
204
{
205
    uint32_t magic;
206
    uint8_t *obuf;
207
    int length;
208

    
209
    obuf = buf;
210

    
211
    magic = AV_RL32(buf);
212
    buf += 4;
213

    
214
    if(magic == 0x00000100) { /* old header */
215
/*      av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
216
        return 40;
217
    } else if(magic == 0x00000101) { /* new header */
218
        int w, h, size, flags, xr, yr;
219

    
220
        length = AV_RL32(buf);
221
        buf += 4;
222

    
223
        init_get_bits(&ctx->gb, buf, 32 * 8);
224
        size = get_bits_long(&ctx->gb, 31);
225
        h = get_bits(&ctx->gb, 15);
226
        w = get_bits(&ctx->gb, 15);
227
        flags = get_bits_long(&ctx->gb, 31);
228
        yr = get_bits(&ctx->gb, 9);
229
        xr = get_bits(&ctx->gb, 9);
230

    
231
        return 40;
232
    } else {
233
        av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
234
        return -1;
235
    }
236

    
237
    return (buf - obuf);
238
}
239

    
240
static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
241
    int d, mb;
242
    int i, v;
243

    
244
    d = get_bits(&ctx->gb, 9);
245
    mb = get_bits(&ctx->gb, 5);
246

    
247
    if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
248
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
249
        return -1;
250
    }
251

    
252
    for(i = 0; i < d; i++) {
253
        v = get_bits_long(&ctx->gb, mb);
254
        if(v & (1 << (mb - 1)))
255
            ctx->deltas[stream_id][i] = v - (1 << mb);
256
        else
257
            ctx->deltas[stream_id][i] = v;
258
    }
259
    for(; i < TM2_DELTAS; i++)
260
        ctx->deltas[stream_id][i] = 0;
261

    
262
    return 0;
263
}
264

    
265
static int tm2_read_stream(TM2Context *ctx, uint8_t *buf, int stream_id) {
266
    int i;
267
    int cur = 0;
268
    int skip = 0;
269
    int len, toks;
270
    TM2Codes codes;
271

    
272
    /* get stream length in dwords */
273
    len = AV_RB32(buf); buf += 4; cur += 4;
274
    skip = len * 4 + 4;
275

    
276
    if(len == 0)
277
        return 4;
278

    
279
    toks = AV_RB32(buf); buf += 4; cur += 4;
280
    if(toks & 1) {
281
        len = AV_RB32(buf); buf += 4; cur += 4;
282
        if(len == TM2_ESCAPE) {
283
            len = AV_RB32(buf); buf += 4; cur += 4;
284
        }
285
        if(len > 0) {
286
            init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
287
            if(tm2_read_deltas(ctx, stream_id) == -1)
288
                return -1;
289
            buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
290
            cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
291
        }
292
    }
293
    /* skip unused fields */
294
    if(AV_RB32(buf) == TM2_ESCAPE) {
295
        buf += 4; cur += 4; /* some unknown length - could be escaped too */
296
    }
297
    buf += 4; cur += 4;
298
    buf += 4; cur += 4; /* unused by decoder */
299

    
300
    init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
301
    if(tm2_build_huff_table(ctx, &codes) == -1)
302
        return -1;
303
    buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
304
    cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
305

    
306
    toks >>= 1;
307
    /* check if we have sane number of tokens */
308
    if((toks < 0) || (toks > 0xFFFFFF)){
309
        av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
310
        tm2_free_codes(&codes);
311
        return -1;
312
    }
313
    ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
314
    ctx->tok_lens[stream_id] = toks;
315
    len = AV_RB32(buf); buf += 4; cur += 4;
316
    if(len > 0) {
317
        init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
318
        for(i = 0; i < toks; i++)
319
            ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
320
    } else {
321
        for(i = 0; i < toks; i++)
322
            ctx->tokens[stream_id][i] = codes.recode[0];
323
    }
324
    tm2_free_codes(&codes);
325

    
326
    return skip;
327
}
328

    
329
static inline int GET_TOK(TM2Context *ctx,int type) {
330
    if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
331
        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]);
332
        return 0;
333
    }
334
    if(type <= TM2_MOT)
335
        return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
336
    return ctx->tokens[type][ctx->tok_ptrs[type]++];
337
}
338

    
339
/* blocks decoding routines */
340

    
341
/* common Y, U, V pointers initialisation */
342
#define TM2_INIT_POINTERS() \
343
    int *last, *clast; \
344
    int *Y, *U, *V;\
345
    int Ystride, Ustride, Vstride;\
346
\
347
    Ystride = ctx->avctx->width;\
348
    Vstride = (ctx->avctx->width + 1) >> 1;\
349
    Ustride = (ctx->avctx->width + 1) >> 1;\
350
    Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
351
    V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
352
    U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
353
    last = ctx->last + bx * 4;\
354
    clast = ctx->clast + bx * 4;
355

    
356
#define TM2_INIT_POINTERS_2() \
357
    int *Yo, *Uo, *Vo;\
358
    int oYstride, oUstride, oVstride;\
359
\
360
    TM2_INIT_POINTERS();\
361
    oYstride = Ystride;\
362
    oVstride = Vstride;\
363
    oUstride = Ustride;\
364
    Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
365
    Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
366
    Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
367

    
368
/* recalculate last and delta values for next blocks */
369
#define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
370
    CD[0] = (CHR[1] - 128) - last[1];\
371
    CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
372
    last[0] = (int)CHR[stride + 0] - 128;\
373
    last[1] = (int)CHR[stride + 1] - 128;}
374

    
375
/* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
376
static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
377
{
378
    int ct, d;
379
    int i, j;
380

    
381
    for(j = 0; j < 4; j++){
382
        ct = ctx->D[j];
383
        for(i = 0; i < 4; i++){
384
            d = deltas[i + j * 4];
385
            ct += d;
386
            last[i] += ct;
387
            Y[i] = av_clip_uint8(last[i]);
388
        }
389
        Y += stride;
390
        ctx->D[j] = ct;
391
    }
392
}
393

    
394
static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
395
{
396
    int i, j;
397
    for(j = 0; j < 2; j++){
398
        for(i = 0; i < 2; i++){
399
            CD[j] += deltas[i + j * 2];
400
            last[i] += CD[j];
401
            data[i] = last[i] + 128;
402
        }
403
        data += stride;
404
    }
405
}
406

    
407
static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
408
{
409
    int t;
410
    int l;
411
    int prev;
412

    
413
    if(bx > 0)
414
        prev = clast[-3];
415
    else
416
        prev = 0;
417
    t = (CD[0] + CD[1]) >> 1;
418
    l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
419
    CD[1] = CD[0] + CD[1] - t;
420
    CD[0] = t;
421
    clast[0] = l;
422

    
423
    tm2_high_chroma(data, stride, clast, CD, deltas);
424
}
425

    
426
static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
427
{
428
    int i;
429
    int deltas[16];
430
    TM2_INIT_POINTERS();
431

    
432
    /* hi-res chroma */
433
    for(i = 0; i < 4; i++) {
434
        deltas[i] = GET_TOK(ctx, TM2_C_HI);
435
        deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
436
    }
437
    tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
438
    tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
439

    
440
    /* hi-res luma */
441
    for(i = 0; i < 16; i++)
442
        deltas[i] = GET_TOK(ctx, TM2_L_HI);
443

    
444
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
445
}
446

    
447
static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
448
{
449
    int i;
450
    int deltas[16];
451
    TM2_INIT_POINTERS();
452

    
453
    /* low-res chroma */
454
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
455
    deltas[1] = deltas[2] = deltas[3] = 0;
456
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
457

    
458
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
459
    deltas[1] = deltas[2] = deltas[3] = 0;
460
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
461

    
462
    /* hi-res luma */
463
    for(i = 0; i < 16; i++)
464
        deltas[i] = GET_TOK(ctx, TM2_L_HI);
465

    
466
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
467
}
468

    
469
static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
470
{
471
    int i;
472
    int t1, t2;
473
    int deltas[16];
474
    TM2_INIT_POINTERS();
475

    
476
    /* low-res chroma */
477
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
478
    deltas[1] = deltas[2] = deltas[3] = 0;
479
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
480

    
481
    deltas[0] = GET_TOK(ctx, TM2_C_LO);
482
    deltas[1] = deltas[2] = deltas[3] = 0;
483
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
484

    
485
    /* low-res luma */
486
    for(i = 0; i < 16; i++)
487
        deltas[i] = 0;
488

    
489
    deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
490
    deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
491
    deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
492
    deltas[10] = GET_TOK(ctx, TM2_L_LO);
493

    
494
    if(bx > 0)
495
        last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
496
    else
497
        last[0] = (last[1]  - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
498
    last[2] = (last[1] + last[3]) >> 1;
499

    
500
    t1 = ctx->D[0] + ctx->D[1];
501
    ctx->D[0] = t1 >> 1;
502
    ctx->D[1] = t1 - (t1 >> 1);
503
    t2 = ctx->D[2] + ctx->D[3];
504
    ctx->D[2] = t2 >> 1;
505
    ctx->D[3] = t2 - (t2 >> 1);
506

    
507
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
508
}
509

    
510
static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
511
{
512
    int i;
513
    int ct;
514
    int left, right, diff;
515
    int deltas[16];
516
    TM2_INIT_POINTERS();
517

    
518
    /* null chroma */
519
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
520
    tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
521

    
522
    deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
523
    tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
524

    
525
    /* null luma */
526
    for(i = 0; i < 16; i++)
527
        deltas[i] = 0;
528

    
529
    ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
530

    
531
    if(bx > 0)
532
        left = last[-1] - ct;
533
    else
534
        left = 0;
535

    
536
    right = last[3];
537
    diff = right - left;
538
    last[0] = left + (diff >> 2);
539
    last[1] = left + (diff >> 1);
540
    last[2] = right - (diff >> 2);
541
    last[3] = right;
542
    {
543
        int tp = left;
544

    
545
        ctx->D[0] = (tp + (ct >> 2)) - left;
546
        left += ctx->D[0];
547
        ctx->D[1] = (tp + (ct >> 1)) - left;
548
        left += ctx->D[1];
549
        ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
550
        left += ctx->D[2];
551
        ctx->D[3] = (tp + ct) - left;
552
    }
553
    tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
554
}
555

    
556
static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
557
{
558
    int i, j;
559
    TM2_INIT_POINTERS_2();
560

    
561
    /* update chroma */
562
    for(j = 0; j < 2; j++){
563
        for(i = 0; i < 2; i++){
564
            U[i] = Uo[i];
565
            V[i] = Vo[i];
566
        }
567
        U += Ustride; V += Vstride;
568
        Uo += oUstride; Vo += oVstride;
569
    }
570
    U -= Ustride * 2;
571
    V -= Vstride * 2;
572
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
573
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
574

    
575
    /* update deltas */
576
    ctx->D[0] = Yo[3] - last[3];
577
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
578
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
579
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
580

    
581
    for(j = 0; j < 4; j++){
582
        for(i = 0; i < 4; i++){
583
            Y[i] = Yo[i];
584
            last[i] = Yo[i];
585
        }
586
        Y += Ystride;
587
        Yo += oYstride;
588
    }
589
}
590

    
591
static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
592
{
593
    int i, j;
594
    int d;
595
    TM2_INIT_POINTERS_2();
596

    
597
    /* update chroma */
598
    for(j = 0; j < 2; j++){
599
        for(i = 0; i < 2; i++){
600
            U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
601
            V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
602
        }
603
        U += Ustride; V += Vstride;
604
        Uo += oUstride; Vo += oVstride;
605
    }
606
    U -= Ustride * 2;
607
    V -= Vstride * 2;
608
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
609
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
610

    
611
    /* update deltas */
612
    ctx->D[0] = Yo[3] - last[3];
613
    ctx->D[1] = Yo[3 + oYstride] - Yo[3];
614
    ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
615
    ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
616

    
617
    for(j = 0; j < 4; j++){
618
        d = last[3];
619
        for(i = 0; i < 4; i++){
620
            Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
621
            last[i] = Y[i];
622
        }
623
        ctx->D[j] = last[3] - d;
624
        Y += Ystride;
625
        Yo += oYstride;
626
    }
627
}
628

    
629
static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
630
{
631
    int i, j;
632
    int mx, my;
633
    TM2_INIT_POINTERS_2();
634

    
635
    mx = GET_TOK(ctx, TM2_MOT);
636
    my = GET_TOK(ctx, TM2_MOT);
637

    
638
    Yo += my * oYstride + mx;
639
    Uo += (my >> 1) * oUstride + (mx >> 1);
640
    Vo += (my >> 1) * oVstride + (mx >> 1);
641

    
642
    /* copy chroma */
643
    for(j = 0; j < 2; j++){
644
        for(i = 0; i < 2; i++){
645
            U[i] = Uo[i];
646
            V[i] = Vo[i];
647
        }
648
        U += Ustride; V += Vstride;
649
        Uo += oUstride; Vo += oVstride;
650
    }
651
    U -= Ustride * 2;
652
    V -= Vstride * 2;
653
    TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
654
    TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
655

    
656
    /* copy luma */
657
    for(j = 0; j < 4; j++){
658
        for(i = 0; i < 4; i++){
659
            Y[i] = Yo[i];
660
        }
661
        Y += Ystride;
662
        Yo += oYstride;
663
    }
664
    /* calculate deltas */
665
    Y -= Ystride * 4;
666
    ctx->D[0] = Y[3] - last[3];
667
    ctx->D[1] = Y[3 + Ystride] - Y[3];
668
    ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
669
    ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
670
    for(i = 0; i < 4; i++)
671
        last[i] = Y[i + Ystride * 3];
672
}
673

    
674
static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
675
{
676
    int i, j;
677
    int bw, bh;
678
    int type;
679
    int keyframe = 1;
680
    uint8_t *Y, *U, *V;
681
    int *src;
682

    
683
    bw = ctx->avctx->width >> 2;
684
    bh = ctx->avctx->height >> 2;
685

    
686
    for(i = 0; i < TM2_NUM_STREAMS; i++)
687
        ctx->tok_ptrs[i] = 0;
688

    
689
    if (ctx->tok_lens[TM2_TYPE]<bw*bh){
690
        av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
691
        return -1;
692
    }
693

    
694
    memset(ctx->last, 0, 4 * bw * sizeof(int));
695
    memset(ctx->clast, 0, 4 * bw * sizeof(int));
696

    
697
    for(j = 0; j < bh; j++) {
698
        memset(ctx->D, 0, 4 * sizeof(int));
699
        memset(ctx->CD, 0, 4 * sizeof(int));
700
        for(i = 0; i < bw; i++) {
701
            type = GET_TOK(ctx, TM2_TYPE);
702
            switch(type) {
703
            case TM2_HI_RES:
704
                tm2_hi_res_block(ctx, p, i, j);
705
                break;
706
            case TM2_MED_RES:
707
                tm2_med_res_block(ctx, p, i, j);
708
                break;
709
            case TM2_LOW_RES:
710
                tm2_low_res_block(ctx, p, i, j);
711
                break;
712
            case TM2_NULL_RES:
713
                tm2_null_res_block(ctx, p, i, j);
714
                break;
715
            case TM2_UPDATE:
716
                tm2_update_block(ctx, p, i, j);
717
                keyframe = 0;
718
                break;
719
            case TM2_STILL:
720
                tm2_still_block(ctx, p, i, j);
721
                keyframe = 0;
722
                break;
723
            case TM2_MOTION:
724
                tm2_motion_block(ctx, p, i, j);
725
                keyframe = 0;
726
                break;
727
            default:
728
                av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
729
            }
730
        }
731
    }
732

    
733
    /* copy data from our buffer to AVFrame */
734
    Y = p->data[0];
735
    src = (ctx->cur?ctx->Y2:ctx->Y1);
736
    for(j = 0; j < ctx->avctx->height; j++){
737
        for(i = 0; i < ctx->avctx->width; i++){
738
            Y[i] = av_clip_uint8(*src++);
739
        }
740
        Y += p->linesize[0];
741
    }
742
    U = p->data[2];
743
    src = (ctx->cur?ctx->U2:ctx->U1);
744
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
745
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
746
            U[i] = av_clip_uint8(*src++);
747
        }
748
        U += p->linesize[2];
749
    }
750
    V = p->data[1];
751
    src = (ctx->cur?ctx->V2:ctx->V1);
752
    for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
753
        for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
754
            V[i] = av_clip_uint8(*src++);
755
        }
756
        V += p->linesize[1];
757
    }
758

    
759
    return keyframe;
760
}
761

    
762
static int decode_frame(AVCodecContext *avctx,
763
                        void *data, int *data_size,
764
                        uint8_t *buf, int buf_size)
765
{
766
    TM2Context * const l = avctx->priv_data;
767
    AVFrame * const p= (AVFrame*)&l->pic;
768
    int skip, t;
769

    
770
    p->reference = 1;
771
    p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
772
    if(avctx->reget_buffer(avctx, p) < 0){
773
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
774
        return -1;
775
    }
776

    
777
    l->dsp.bswap_buf((uint32_t*)buf, (uint32_t*)buf, buf_size >> 2);
778
    skip = tm2_read_header(l, buf);
779

    
780
    if(skip == -1)
781
        return -1;
782

    
783
    t = tm2_read_stream(l, buf + skip, TM2_C_HI);
784
    if(t == -1)
785
        return -1;
786
    skip += t;
787
    t = tm2_read_stream(l, buf + skip, TM2_C_LO);
788
    if(t == -1)
789
        return -1;
790
    skip += t;
791
    t = tm2_read_stream(l, buf + skip, TM2_L_HI);
792
    if(t == -1)
793
        return -1;
794
    skip += t;
795
    t = tm2_read_stream(l, buf + skip, TM2_L_LO);
796
    if(t == -1)
797
        return -1;
798
    skip += t;
799
    t = tm2_read_stream(l, buf + skip, TM2_UPD);
800
    if(t == -1)
801
        return -1;
802
    skip += t;
803
    t = tm2_read_stream(l, buf + skip, TM2_MOT);
804
    if(t == -1)
805
        return -1;
806
    skip += t;
807
    t = tm2_read_stream(l, buf + skip, TM2_TYPE);
808
    if(t == -1)
809
        return -1;
810
    p->key_frame = tm2_decode_blocks(l, p);
811
    if(p->key_frame)
812
        p->pict_type = FF_I_TYPE;
813
    else
814
        p->pict_type = FF_P_TYPE;
815

    
816
    l->cur = !l->cur;
817
    *data_size = sizeof(AVFrame);
818
    *(AVFrame*)data = l->pic;
819

    
820
    return buf_size;
821
}
822

    
823
static int decode_init(AVCodecContext *avctx){
824
    TM2Context * const l = avctx->priv_data;
825
    int i;
826

    
827
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
828
        return -1;
829
    }
830
    if((avctx->width & 3) || (avctx->height & 3)){
831
        av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
832
        return -1;
833
    }
834

    
835
    l->avctx = avctx;
836
    l->pic.data[0]=NULL;
837
    avctx->has_b_frames = 0;
838
    avctx->pix_fmt = PIX_FMT_YUV420P;
839

    
840
    dsputil_init(&l->dsp, avctx);
841

    
842
    l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
843
    l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
844

    
845
    for(i = 0; i < TM2_NUM_STREAMS; i++) {
846
        l->tokens[i] = NULL;
847
        l->tok_lens[i] = 0;
848
    }
849

    
850
    l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
851
    l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
852
    l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
853
    l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
854
    l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
855
    l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
856
    l->cur = 0;
857

    
858
    return 0;
859
}
860

    
861
static int decode_end(AVCodecContext *avctx){
862
    TM2Context * const l = avctx->priv_data;
863
    int i;
864

    
865
    if(l->last)
866
        av_free(l->last);
867
    if(l->clast)
868
        av_free(l->clast);
869
    for(i = 0; i < TM2_NUM_STREAMS; i++)
870
        if(l->tokens[i])
871
            av_free(l->tokens[i]);
872
    if(l->Y1){
873
        av_free(l->Y1);
874
        av_free(l->U1);
875
        av_free(l->V1);
876
        av_free(l->Y2);
877
        av_free(l->U2);
878
        av_free(l->V2);
879
    }
880
    return 0;
881
}
882

    
883
AVCodec truemotion2_decoder = {
884
    "truemotion2",
885
    CODEC_TYPE_VIDEO,
886
    CODEC_ID_TRUEMOTION2,
887
    sizeof(TM2Context),
888
    decode_init,
889
    NULL,
890
    decode_end,
891
    decode_frame,
892
    CODEC_CAP_DR1,
893
};