8d72bb6df088de729ffb7e589a00290e9a2be9b6
[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 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
276 if(tm2_read_deltas(ctx, stream_id) == -1)
277 return -1;
278 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
279 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
280 }
281 }
282 /* skip unused fields */
283 if(AV_RB32(buf) == TM2_ESCAPE) {
284 buf += 4; cur += 4; /* some unknown length - could be escaped too */
285 }
286 buf += 4; cur += 4;
287 buf += 4; cur += 4; /* unused by decoder */
288
289 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
290 if(tm2_build_huff_table(ctx, &codes) == -1)
291 return -1;
292 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
293 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
294
295 toks >>= 1;
296 /* check if we have sane number of tokens */
297 if((toks < 0) || (toks > 0xFFFFFF)){
298 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
299 tm2_free_codes(&codes);
300 return -1;
301 }
302 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
303 ctx->tok_lens[stream_id] = toks;
304 len = AV_RB32(buf); buf += 4; cur += 4;
305 if(len > 0) {
306 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
307 for(i = 0; i < toks; i++) {
308 if (get_bits_left(&ctx->gb) <= 0) {
309 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
310 return -1;
311 }
312 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
313 }
314 } else {
315 for(i = 0; i < toks; i++)
316 ctx->tokens[stream_id][i] = codes.recode[0];
317 }
318 tm2_free_codes(&codes);
319
320 return skip;
321 }
322
323 static inline int GET_TOK(TM2Context *ctx,int type) {
324 if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
325 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]);
326 return 0;
327 }
328 if(type <= TM2_MOT)
329 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
330 return ctx->tokens[type][ctx->tok_ptrs[type]++];
331 }
332
333 /* blocks decoding routines */
334
335 /* common Y, U, V pointers initialisation */
336 #define TM2_INIT_POINTERS() \
337 int *last, *clast; \
338 int *Y, *U, *V;\
339 int Ystride, Ustride, Vstride;\
340 \
341 Ystride = ctx->avctx->width;\
342 Vstride = (ctx->avctx->width + 1) >> 1;\
343 Ustride = (ctx->avctx->width + 1) >> 1;\
344 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
345 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
346 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
347 last = ctx->last + bx * 4;\
348 clast = ctx->clast + bx * 4;
349
350 #define TM2_INIT_POINTERS_2() \
351 int *Yo, *Uo, *Vo;\
352 int oYstride, oUstride, oVstride;\
353 \
354 TM2_INIT_POINTERS();\
355 oYstride = Ystride;\
356 oVstride = Vstride;\
357 oUstride = Ustride;\
358 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
359 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
360 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
361
362 /* recalculate last and delta values for next blocks */
363 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
364 CD[0] = CHR[1] - last[1];\
365 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
366 last[0] = (int)CHR[stride + 0];\
367 last[1] = (int)CHR[stride + 1];}
368
369 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
370 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
371 {
372 int ct, d;
373 int i, j;
374
375 for(j = 0; j < 4; j++){
376 ct = ctx->D[j];
377 for(i = 0; i < 4; i++){
378 d = deltas[i + j * 4];
379 ct += d;
380 last[i] += ct;
381 Y[i] = av_clip_uint8(last[i]);
382 }
383 Y += stride;
384 ctx->D[j] = ct;
385 }
386 }
387
388 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
389 {
390 int i, j;
391 for(j = 0; j < 2; j++){
392 for(i = 0; i < 2; i++){
393 CD[j] += deltas[i + j * 2];
394 last[i] += CD[j];
395 data[i] = last[i];
396 }
397 data += stride;
398 }
399 }
400
401 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
402 {
403 int t;
404 int l;
405 int prev;
406
407 if(bx > 0)
408 prev = clast[-3];
409 else
410 prev = 0;
411 t = (CD[0] + CD[1]) >> 1;
412 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
413 CD[1] = CD[0] + CD[1] - t;
414 CD[0] = t;
415 clast[0] = l;
416
417 tm2_high_chroma(data, stride, clast, CD, deltas);
418 }
419
420 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
421 {
422 int i;
423 int deltas[16];
424 TM2_INIT_POINTERS();
425
426 /* hi-res chroma */
427 for(i = 0; i < 4; i++) {
428 deltas[i] = GET_TOK(ctx, TM2_C_HI);
429 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
430 }
431 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
432 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
433
434 /* hi-res luma */
435 for(i = 0; i < 16; i++)
436 deltas[i] = GET_TOK(ctx, TM2_L_HI);
437
438 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
439 }
440
441 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
442 {
443 int i;
444 int deltas[16];
445 TM2_INIT_POINTERS();
446
447 /* low-res chroma */
448 deltas[0] = GET_TOK(ctx, TM2_C_LO);
449 deltas[1] = deltas[2] = deltas[3] = 0;
450 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
451
452 deltas[0] = GET_TOK(ctx, TM2_C_LO);
453 deltas[1] = deltas[2] = deltas[3] = 0;
454 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
455
456 /* hi-res luma */
457 for(i = 0; i < 16; i++)
458 deltas[i] = GET_TOK(ctx, TM2_L_HI);
459
460 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
461 }
462
463 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
464 {
465 int i;
466 int t1, t2;
467 int deltas[16];
468 TM2_INIT_POINTERS();
469
470 /* low-res chroma */
471 deltas[0] = GET_TOK(ctx, TM2_C_LO);
472 deltas[1] = deltas[2] = deltas[3] = 0;
473 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
474
475 deltas[0] = GET_TOK(ctx, TM2_C_LO);
476 deltas[1] = deltas[2] = deltas[3] = 0;
477 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
478
479 /* low-res luma */
480 for(i = 0; i < 16; i++)
481 deltas[i] = 0;
482
483 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
484 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
485 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
486 deltas[10] = GET_TOK(ctx, TM2_L_LO);
487
488 if(bx > 0)
489 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
490 else
491 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
492 last[2] = (last[1] + last[3]) >> 1;
493
494 t1 = ctx->D[0] + ctx->D[1];
495 ctx->D[0] = t1 >> 1;
496 ctx->D[1] = t1 - (t1 >> 1);
497 t2 = ctx->D[2] + ctx->D[3];
498 ctx->D[2] = t2 >> 1;
499 ctx->D[3] = t2 - (t2 >> 1);
500
501 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
502 }
503
504 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
505 {
506 int i;
507 int ct;
508 int left, right, diff;
509 int deltas[16];
510 TM2_INIT_POINTERS();
511
512 /* null chroma */
513 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
514 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
515
516 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
517 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
518
519 /* null luma */
520 for(i = 0; i < 16; i++)
521 deltas[i] = 0;
522
523 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
524
525 if(bx > 0)
526 left = last[-1] - ct;
527 else
528 left = 0;
529
530 right = last[3];
531 diff = right - left;
532 last[0] = left + (diff >> 2);
533 last[1] = left + (diff >> 1);
534 last[2] = right - (diff >> 2);
535 last[3] = right;
536 {
537 int tp = left;
538
539 ctx->D[0] = (tp + (ct >> 2)) - left;
540 left += ctx->D[0];
541 ctx->D[1] = (tp + (ct >> 1)) - left;
542 left += ctx->D[1];
543 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
544 left += ctx->D[2];
545 ctx->D[3] = (tp + ct) - left;
546 }
547 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
548 }
549
550 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
551 {
552 int i, j;
553 TM2_INIT_POINTERS_2();
554
555 /* update chroma */
556 for(j = 0; j < 2; j++){
557 for(i = 0; i < 2; i++){
558 U[i] = Uo[i];
559 V[i] = Vo[i];
560 }
561 U += Ustride; V += Vstride;
562 Uo += oUstride; Vo += oVstride;
563 }
564 U -= Ustride * 2;
565 V -= Vstride * 2;
566 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
567 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
568
569 /* update deltas */
570 ctx->D[0] = Yo[3] - last[3];
571 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
572 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
573 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
574
575 for(j = 0; j < 4; j++){
576 for(i = 0; i < 4; i++){
577 Y[i] = Yo[i];
578 last[i] = Yo[i];
579 }
580 Y += Ystride;
581 Yo += oYstride;
582 }
583 }
584
585 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
586 {
587 int i, j;
588 int d;
589 TM2_INIT_POINTERS_2();
590
591 /* update chroma */
592 for(j = 0; j < 2; j++){
593 for(i = 0; i < 2; i++){
594 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
595 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
596 }
597 U += Ustride; V += Vstride;
598 Uo += oUstride; Vo += oVstride;
599 }
600 U -= Ustride * 2;
601 V -= Vstride * 2;
602 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
603 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
604
605 /* update deltas */
606 ctx->D[0] = Yo[3] - last[3];
607 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
608 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
609 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
610
611 for(j = 0; j < 4; j++){
612 d = last[3];
613 for(i = 0; i < 4; i++){
614 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
615 last[i] = Y[i];
616 }
617 ctx->D[j] = last[3] - d;
618 Y += Ystride;
619 Yo += oYstride;
620 }
621 }
622
623 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
624 {
625 int i, j;
626 int mx, my;
627 TM2_INIT_POINTERS_2();
628
629 mx = GET_TOK(ctx, TM2_MOT);
630 my = GET_TOK(ctx, TM2_MOT);
631
632 Yo += my * oYstride + mx;
633 Uo += (my >> 1) * oUstride + (mx >> 1);
634 Vo += (my >> 1) * oVstride + (mx >> 1);
635
636 /* copy chroma */
637 for(j = 0; j < 2; j++){
638 for(i = 0; i < 2; i++){
639 U[i] = Uo[i];
640 V[i] = Vo[i];
641 }
642 U += Ustride; V += Vstride;
643 Uo += oUstride; Vo += oVstride;
644 }
645 U -= Ustride * 2;
646 V -= Vstride * 2;
647 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
648 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
649
650 /* copy luma */
651 for(j = 0; j < 4; j++){
652 for(i = 0; i < 4; i++){
653 Y[i] = Yo[i];
654 }
655 Y += Ystride;
656 Yo += oYstride;
657 }
658 /* calculate deltas */
659 Y -= Ystride * 4;
660 ctx->D[0] = Y[3] - last[3];
661 ctx->D[1] = Y[3 + Ystride] - Y[3];
662 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
663 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
664 for(i = 0; i < 4; i++)
665 last[i] = Y[i + Ystride * 3];
666 }
667
668 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
669 {
670 int i, j;
671 int bw, bh;
672 int type;
673 int keyframe = 1;
674 int *Y, *U, *V;
675 uint8_t *dst;
676
677 bw = ctx->avctx->width >> 2;
678 bh = ctx->avctx->height >> 2;
679
680 for(i = 0; i < TM2_NUM_STREAMS; i++)
681 ctx->tok_ptrs[i] = 0;
682
683 if (ctx->tok_lens[TM2_TYPE]<bw*bh){
684 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
685 return -1;
686 }
687
688 memset(ctx->last, 0, 4 * bw * sizeof(int));
689 memset(ctx->clast, 0, 4 * bw * sizeof(int));
690
691 for(j = 0; j < bh; j++) {
692 memset(ctx->D, 0, 4 * sizeof(int));
693 memset(ctx->CD, 0, 4 * sizeof(int));
694 for(i = 0; i < bw; i++) {
695 type = GET_TOK(ctx, TM2_TYPE);
696 switch(type) {
697 case TM2_HI_RES:
698 tm2_hi_res_block(ctx, p, i, j);
699 break;
700 case TM2_MED_RES:
701 tm2_med_res_block(ctx, p, i, j);
702 break;
703 case TM2_LOW_RES:
704 tm2_low_res_block(ctx, p, i, j);
705 break;
706 case TM2_NULL_RES:
707 tm2_null_res_block(ctx, p, i, j);
708 break;
709 case TM2_UPDATE:
710 tm2_update_block(ctx, p, i, j);
711 keyframe = 0;
712 break;
713 case TM2_STILL:
714 tm2_still_block(ctx, p, i, j);
715 keyframe = 0;
716 break;
717 case TM2_MOTION:
718 tm2_motion_block(ctx, p, i, j);
719 keyframe = 0;
720 break;
721 default:
722 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
723 }
724 }
725 }
726
727 /* copy data from our buffer to AVFrame */
728 Y = (ctx->cur?ctx->Y2:ctx->Y1);
729 U = (ctx->cur?ctx->U2:ctx->U1);
730 V = (ctx->cur?ctx->V2:ctx->V1);
731 dst = p->data[0];
732 for(j = 0; j < ctx->avctx->height; j++){
733 for(i = 0; i < ctx->avctx->width; i++){
734 int y = Y[i], u = U[i >> 1], v = V[i >> 1];
735 dst[3*i+0] = av_clip_uint8(y + v);
736 dst[3*i+1] = av_clip_uint8(y);
737 dst[3*i+2] = av_clip_uint8(y + u);
738 }
739 Y += ctx->avctx->width;
740 if (j & 1) {
741 U += ctx->avctx->width >> 1;
742 V += ctx->avctx->width >> 1;
743 }
744 dst += p->linesize[0];
745 }
746
747 return keyframe;
748 }
749
750 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
751 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
752 };
753
754 static int decode_frame(AVCodecContext *avctx,
755 void *data, int *data_size,
756 AVPacket *avpkt)
757 {
758 const uint8_t *buf = avpkt->data;
759 int buf_size = avpkt->size;
760 TM2Context * const l = avctx->priv_data;
761 AVFrame * const p= (AVFrame*)&l->pic;
762 int i, skip, t;
763 uint8_t *swbuf;
764
765 swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
766 if(!swbuf){
767 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
768 return -1;
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 av_free(swbuf);
775 return -1;
776 }
777
778 l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
779 skip = tm2_read_header(l, swbuf);
780
781 if(skip == -1){
782 av_free(swbuf);
783 return -1;
784 }
785
786 for(i = 0; i < TM2_NUM_STREAMS; i++){
787 t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i], buf_size);
788 if(t == -1){
789 av_free(swbuf);
790 return -1;
791 }
792 skip += t;
793 }
794 p->key_frame = tm2_decode_blocks(l, p);
795 if(p->key_frame)
796 p->pict_type = AV_PICTURE_TYPE_I;
797 else
798 p->pict_type = AV_PICTURE_TYPE_P;
799
800 l->cur = !l->cur;
801 *data_size = sizeof(AVFrame);
802 *(AVFrame*)data = l->pic;
803 av_free(swbuf);
804
805 return buf_size;
806 }
807
808 static av_cold int decode_init(AVCodecContext *avctx){
809 TM2Context * const l = avctx->priv_data;
810 int i;
811
812 if((avctx->width & 3) || (avctx->height & 3)){
813 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
814 return -1;
815 }
816
817 l->avctx = avctx;
818 l->pic.data[0]=NULL;
819 avctx->pix_fmt = PIX_FMT_BGR24;
820
821 dsputil_init(&l->dsp, avctx);
822
823 l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
824 l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
825
826 for(i = 0; i < TM2_NUM_STREAMS; i++) {
827 l->tokens[i] = NULL;
828 l->tok_lens[i] = 0;
829 }
830
831 l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
832 l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
833 l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
834 l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
835 l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
836 l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
837 l->cur = 0;
838
839 return 0;
840 }
841
842 static av_cold int decode_end(AVCodecContext *avctx){
843 TM2Context * const l = avctx->priv_data;
844 AVFrame *pic = &l->pic;
845 int i;
846
847 av_free(l->last);
848 av_free(l->clast);
849 for(i = 0; i < TM2_NUM_STREAMS; i++)
850 av_free(l->tokens[i]);
851 if(l->Y1){
852 av_free(l->Y1);
853 av_free(l->U1);
854 av_free(l->V1);
855 av_free(l->Y2);
856 av_free(l->U2);
857 av_free(l->V2);
858 }
859
860 if (pic->data[0])
861 avctx->release_buffer(avctx, pic);
862
863 return 0;
864 }
865
866 AVCodec ff_truemotion2_decoder = {
867 .name = "truemotion2",
868 .type = AVMEDIA_TYPE_VIDEO,
869 .id = CODEC_ID_TRUEMOTION2,
870 .priv_data_size = sizeof(TM2Context),
871 .init = decode_init,
872 .close = decode_end,
873 .decode = decode_frame,
874 .capabilities = CODEC_CAP_DR1,
875 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
876 };