truemotion2: check size before GetBitContext initialisation
[libav.git] / libavcodec / truemotion2.c
1 /*
2 * Duck/ON2 TrueMotion 2 Decoder
3 * Copyright (c) 2005 Konstantin Shishkov
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 /**
23 * @file
24 * Duck TrueMotion2 decoder.
25 */
26
27 #include "avcodec.h"
28 #include "get_bits.h"
29 #include "dsputil.h"
30
31 #define TM2_ESCAPE 0x80000000
32 #define TM2_DELTAS 64
33 /* 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,
35 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{
41 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 */
59 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 Libav bitstream reader
68 int bits;
69 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
78 int max_bits; ///< maximum length of code
79 int min_bits; ///< minimum length of code
80 int nodes; ///< total number of nodes in tree
81 int num; ///< current number filled
82 int max_num; ///< total number of codes
83 int *nums; ///< literals
84 uint32_t *bits; ///< codes
85 int *lens; ///< codelengths
86 } 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;
105 huff->lens[huff->num] = length;
106 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);
124 huff.min_bits = get_bits(&ctx->gb, 5);
125 huff.nodes = get_bits_long(&ctx->gb, 17);
126 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));
147 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 av_free(code->recode);
189 if(code->vlc.table)
190 free_vlc(&code->vlc);
191 }
192
193 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
194 {
195 int val;
196 val = get_vlc2(gb, code->vlc.table, code->bits, 1);
197 return code->recode[val];
198 }
199
200 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
201 {
202 uint32_t magic;
203 const uint8_t *obuf;
204
205 obuf = buf;
206
207 magic = AV_RL32(buf);
208 buf += 4;
209
210 if(magic == 0x00000100) { /* old header */
211 /* av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
212 return 40;
213 } else if(magic == 0x00000101) { /* new header */
214 return 40;
215 } else {
216 av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
217 return -1;
218 }
219
220 return buf - obuf;
221 }
222
223 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
224 int d, mb;
225 int i, v;
226
227 d = get_bits(&ctx->gb, 9);
228 mb = get_bits(&ctx->gb, 5);
229
230 if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
231 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
232 return -1;
233 }
234
235 for(i = 0; i < d; i++) {
236 v = get_bits_long(&ctx->gb, mb);
237 if(v & (1 << (mb - 1)))
238 ctx->deltas[stream_id][i] = v - (1 << mb);
239 else
240 ctx->deltas[stream_id][i] = v;
241 }
242 for(; i < TM2_DELTAS; i++)
243 ctx->deltas[stream_id][i] = 0;
244
245 return 0;
246 }
247
248 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
249 {
250 int i;
251 int cur = 0;
252 int skip = 0;
253 int len, toks;
254 TM2Codes codes;
255
256 /* get stream length in dwords */
257 len = AV_RB32(buf); buf += 4; cur += 4;
258 skip = len * 4 + 4;
259
260 if(len == 0)
261 return 4;
262
263 if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {
264 av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
265 return -1;
266 }
267
268 toks = AV_RB32(buf); buf += 4; cur += 4;
269 if(toks & 1) {
270 len = AV_RB32(buf); buf += 4; cur += 4;
271 if(len == TM2_ESCAPE) {
272 len = AV_RB32(buf); buf += 4; cur += 4;
273 }
274 if(len > 0) {
275 if (skip <= cur)
276 return -1;
277 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
278 if(tm2_read_deltas(ctx, stream_id) == -1)
279 return -1;
280 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
281 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
282 }
283 }
284 /* skip unused fields */
285 if(AV_RB32(buf) == TM2_ESCAPE) {
286 buf += 4; cur += 4; /* some unknown length - could be escaped too */
287 }
288 buf += 4; cur += 4;
289 buf += 4; cur += 4; /* unused by decoder */
290
291 if (skip <= cur)
292 return -1;
293 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
294 if(tm2_build_huff_table(ctx, &codes) == -1)
295 return -1;
296 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
297 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
298
299 toks >>= 1;
300 /* check if we have sane number of tokens */
301 if((toks < 0) || (toks > 0xFFFFFF)){
302 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
303 tm2_free_codes(&codes);
304 return -1;
305 }
306 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
307 ctx->tok_lens[stream_id] = toks;
308 len = AV_RB32(buf); buf += 4; cur += 4;
309 if(len > 0) {
310 if (skip <= cur)
311 return -1;
312 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
313 for(i = 0; i < toks; i++) {
314 if (get_bits_left(&ctx->gb) <= 0) {
315 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
316 return -1;
317 }
318 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
319 }
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] - last[1];\
371 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
372 last[0] = (int)CHR[stride + 0];\
373 last[1] = (int)CHR[stride + 1];}
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];
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 int *Y, *U, *V;
681 uint8_t *dst;
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 = (ctx->cur?ctx->Y2:ctx->Y1);
735 U = (ctx->cur?ctx->U2:ctx->U1);
736 V = (ctx->cur?ctx->V2:ctx->V1);
737 dst = p->data[0];
738 for(j = 0; j < ctx->avctx->height; j++){
739 for(i = 0; i < ctx->avctx->width; i++){
740 int y = Y[i], u = U[i >> 1], v = V[i >> 1];
741 dst[3*i+0] = av_clip_uint8(y + v);
742 dst[3*i+1] = av_clip_uint8(y);
743 dst[3*i+2] = av_clip_uint8(y + u);
744 }
745 Y += ctx->avctx->width;
746 if (j & 1) {
747 U += ctx->avctx->width >> 1;
748 V += ctx->avctx->width >> 1;
749 }
750 dst += p->linesize[0];
751 }
752
753 return keyframe;
754 }
755
756 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
757 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
758 };
759
760 static int decode_frame(AVCodecContext *avctx,
761 void *data, int *data_size,
762 AVPacket *avpkt)
763 {
764 const uint8_t *buf = avpkt->data;
765 int buf_size = avpkt->size;
766 TM2Context * const l = avctx->priv_data;
767 AVFrame * const p= (AVFrame*)&l->pic;
768 int i, skip, t;
769 uint8_t *swbuf;
770
771 swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
772 if(!swbuf){
773 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
774 return -1;
775 }
776 p->reference = 1;
777 p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
778 if(avctx->reget_buffer(avctx, p) < 0){
779 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
780 av_free(swbuf);
781 return -1;
782 }
783
784 l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
785 skip = tm2_read_header(l, swbuf);
786
787 if(skip == -1){
788 av_free(swbuf);
789 return -1;
790 }
791
792 for(i = 0; i < TM2_NUM_STREAMS; i++){
793 t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);
794 if(t == -1){
795 av_free(swbuf);
796 return -1;
797 }
798 skip += t;
799 }
800 p->key_frame = tm2_decode_blocks(l, p);
801 if(p->key_frame)
802 p->pict_type = AV_PICTURE_TYPE_I;
803 else
804 p->pict_type = AV_PICTURE_TYPE_P;
805
806 l->cur = !l->cur;
807 *data_size = sizeof(AVFrame);
808 *(AVFrame*)data = l->pic;
809 av_free(swbuf);
810
811 return buf_size;
812 }
813
814 static av_cold int decode_init(AVCodecContext *avctx){
815 TM2Context * const l = avctx->priv_data;
816 int i;
817
818 if((avctx->width & 3) || (avctx->height & 3)){
819 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
820 return -1;
821 }
822
823 l->avctx = avctx;
824 l->pic.data[0]=NULL;
825 avctx->pix_fmt = PIX_FMT_BGR24;
826
827 dsputil_init(&l->dsp, avctx);
828
829 l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
830 l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
831
832 for(i = 0; i < TM2_NUM_STREAMS; i++) {
833 l->tokens[i] = NULL;
834 l->tok_lens[i] = 0;
835 }
836
837 l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
838 l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
839 l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
840 l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
841 l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
842 l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
843 l->cur = 0;
844
845 return 0;
846 }
847
848 static av_cold int decode_end(AVCodecContext *avctx){
849 TM2Context * const l = avctx->priv_data;
850 AVFrame *pic = &l->pic;
851 int i;
852
853 av_free(l->last);
854 av_free(l->clast);
855 for(i = 0; i < TM2_NUM_STREAMS; i++)
856 av_free(l->tokens[i]);
857 if(l->Y1){
858 av_free(l->Y1);
859 av_free(l->U1);
860 av_free(l->V1);
861 av_free(l->Y2);
862 av_free(l->U2);
863 av_free(l->V2);
864 }
865
866 if (pic->data[0])
867 avctx->release_buffer(avctx, pic);
868
869 return 0;
870 }
871
872 AVCodec ff_truemotion2_decoder = {
873 .name = "truemotion2",
874 .type = AVMEDIA_TYPE_VIDEO,
875 .id = CODEC_ID_TRUEMOTION2,
876 .priv_data_size = sizeof(TM2Context),
877 .init = decode_init,
878 .close = decode_end,
879 .decode = decode_frame,
880 .capabilities = CODEC_CAP_DR1,
881 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
882 };