Use bitstream_init8() where appropriate
[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 <inttypes.h>
28
29 #include "avcodec.h"
30 #include "bitstream.h"
31 #include "bswapdsp.h"
32 #include "bytestream.h"
33 #include "internal.h"
34
35 #define TM2_ESCAPE 0x80000000
36 #define TM2_DELTAS 64
37
38 /* Huffman-coded streams of different types of blocks */
39 enum TM2_STREAMS {
40 TM2_C_HI = 0,
41 TM2_C_LO,
42 TM2_L_HI,
43 TM2_L_LO,
44 TM2_UPD,
45 TM2_MOT,
46 TM2_TYPE,
47 TM2_NUM_STREAMS
48 };
49
50 /* Block types */
51 enum TM2_BLOCKS {
52 TM2_HI_RES = 0,
53 TM2_MED_RES,
54 TM2_LOW_RES,
55 TM2_NULL_RES,
56 TM2_UPDATE,
57 TM2_STILL,
58 TM2_MOTION
59 };
60
61 typedef struct TM2Context {
62 AVCodecContext *avctx;
63 AVFrame *pic;
64
65 BitstreamContext bc;
66 BswapDSPContext bdsp;
67
68 /* TM2 streams */
69 int *tokens[TM2_NUM_STREAMS];
70 int tok_lens[TM2_NUM_STREAMS];
71 int tok_ptrs[TM2_NUM_STREAMS];
72 int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
73 /* for blocks decoding */
74 int D[4];
75 int CD[4];
76 int *last;
77 int *clast;
78
79 /* data for current and previous frame */
80 int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;
81 int *Y1, *U1, *V1, *Y2, *U2, *V2;
82 int y_stride, uv_stride;
83 int cur;
84 } TM2Context;
85
86 /**
87 * Huffman codes for each of streams
88 */
89 typedef struct TM2Codes {
90 VLC vlc; ///< table for Libav bitstream reader
91 int bits;
92 int *recode; ///< table for converting from code indexes to values
93 int length;
94 } TM2Codes;
95
96 /**
97 * structure for gathering Huffman codes information
98 */
99 typedef struct TM2Huff {
100 int val_bits; ///< length of literal
101 int max_bits; ///< maximum length of code
102 int min_bits; ///< minimum length of code
103 int nodes; ///< total number of nodes in tree
104 int num; ///< current number filled
105 int max_num; ///< total number of codes
106 int *nums; ///< literals
107 uint32_t *bits; ///< codes
108 int *lens; ///< codelengths
109 } TM2Huff;
110
111 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
112 {
113 int ret;
114 if (length > huff->max_bits) {
115 av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n",
116 huff->max_bits);
117 return AVERROR_INVALIDDATA;
118 }
119
120 if (!bitstream_read_bit(&ctx->bc)) { /* literal */
121 if (length == 0) {
122 length = 1;
123 }
124 if (huff->num >= huff->max_num) {
125 av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
126 return AVERROR_INVALIDDATA;
127 }
128 huff->nums[huff->num] = bitstream_read(&ctx->bc, huff->val_bits);
129 huff->bits[huff->num] = prefix;
130 huff->lens[huff->num] = length;
131 huff->num++;
132 return 0;
133 } else { /* non-terminal node */
134 if ((ret = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)
135 return ret;
136 if ((ret = tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff)) < 0)
137 return ret;
138 }
139 return 0;
140 }
141
142 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
143 {
144 TM2Huff huff;
145 int res = 0;
146
147 huff.val_bits = bitstream_read(&ctx->bc, 5);
148 huff.max_bits = bitstream_read(&ctx->bc, 5);
149 huff.min_bits = bitstream_read(&ctx->bc, 5);
150 huff.nodes = bitstream_read(&ctx->bc, 17);
151 huff.num = 0;
152
153 /* check for correct codes parameters */
154 if ((huff.val_bits < 1) || (huff.val_bits > 32) ||
155 (huff.max_bits < 0) || (huff.max_bits > 25)) {
156 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "
157 "length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);
158 return AVERROR_INVALIDDATA;
159 }
160 if ((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
161 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "
162 "nodes: %i\n", huff.nodes);
163 return AVERROR_INVALIDDATA;
164 }
165 /* one-node tree */
166 if (huff.max_bits == 0)
167 huff.max_bits = 1;
168
169 /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
170 huff.max_num = (huff.nodes + 1) >> 1;
171 huff.nums = av_mallocz(huff.max_num * sizeof(int));
172 huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
173 huff.lens = av_mallocz(huff.max_num * sizeof(int));
174 if (!huff.nums || !huff.bits || !huff.lens) {
175 res = AVERROR(ENOMEM);
176 goto out;
177 }
178
179 res = tm2_read_tree(ctx, 0, 0, &huff);
180
181 if (huff.num != huff.max_num) {
182 av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
183 huff.num, huff.max_num);
184 res = AVERROR_INVALIDDATA;
185 }
186
187 /* convert codes to vlc_table */
188 if (res >= 0) {
189 int i;
190
191 res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
192 huff.lens, sizeof(int), sizeof(int),
193 huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
194 if (res < 0)
195 av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
196 else {
197 code->bits = huff.max_bits;
198 code->length = huff.max_num;
199 code->recode = av_malloc(code->length * sizeof(int));
200 if (!code->recode) {
201 res = AVERROR(ENOMEM);
202 goto out;
203 }
204 for (i = 0; i < code->length; i++)
205 code->recode[i] = huff.nums[i];
206 }
207 }
208
209 out:
210 /* free allocated memory */
211 av_free(huff.nums);
212 av_free(huff.bits);
213 av_free(huff.lens);
214
215 return res;
216 }
217
218 static void tm2_free_codes(TM2Codes *code)
219 {
220 av_free(code->recode);
221 if (code->vlc.table)
222 ff_free_vlc(&code->vlc);
223 }
224
225 static inline int tm2_get_token(BitstreamContext *bc, TM2Codes *code)
226 {
227 int val;
228 val = bitstream_read_vlc(bc, code->vlc.table, code->bits, 1);
229 return code->recode[val];
230 }
231
232 #define TM2_OLD_HEADER_MAGIC 0x00000100
233 #define TM2_NEW_HEADER_MAGIC 0x00000101
234
235 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
236 {
237 uint32_t magic = AV_RL32(buf);
238
239 switch (magic) {
240 case TM2_OLD_HEADER_MAGIC:
241 avpriv_request_sample(ctx->avctx, "Old TM2 header");
242 return 0;
243 case TM2_NEW_HEADER_MAGIC:
244 return 0;
245 default:
246 av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08"PRIX32"\n",
247 magic);
248 return AVERROR_INVALIDDATA;
249 }
250 }
251
252 static int tm2_read_deltas(TM2Context *ctx, int stream_id)
253 {
254 int d, mb;
255 int i, v;
256
257 d = bitstream_read(&ctx->bc, 9);
258 mb = bitstream_read(&ctx->bc, 5);
259
260 if ((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
261 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
262 return AVERROR_INVALIDDATA;
263 }
264
265 for (i = 0; i < d; i++) {
266 v = bitstream_read(&ctx->bc, mb);
267 if (v & (1 << (mb - 1)))
268 ctx->deltas[stream_id][i] = v - (1 << mb);
269 else
270 ctx->deltas[stream_id][i] = v;
271 }
272 for (; i < TM2_DELTAS; i++)
273 ctx->deltas[stream_id][i] = 0;
274
275 return 0;
276 }
277
278 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
279 {
280 int i, ret;
281 int skip = 0;
282 int len, toks, pos;
283 TM2Codes codes;
284 GetByteContext gb;
285
286 /* get stream length in dwords */
287 bytestream2_init(&gb, buf, buf_size);
288 len = bytestream2_get_be32(&gb);
289 skip = len * 4 + 4;
290
291 if (len == 0)
292 return 4;
293
294 if (len >= INT_MAX / 4 - 1 || len < 0 || skip > buf_size) {
295 av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
296 return AVERROR_INVALIDDATA;
297 }
298
299 toks = bytestream2_get_be32(&gb);
300 if (toks & 1) {
301 len = bytestream2_get_be32(&gb);
302 if (len == TM2_ESCAPE) {
303 len = bytestream2_get_be32(&gb);
304 }
305 if (len > 0) {
306 pos = bytestream2_tell(&gb);
307 if (skip <= pos)
308 return AVERROR_INVALIDDATA;
309 bitstream_init8(&ctx->bc, buf + pos, skip - pos);
310 if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)
311 return ret;
312 bytestream2_skip(&gb, ((bitstream_tell(&ctx->bc) + 31) >> 5) << 2);
313 }
314 }
315 /* skip unused fields */
316 len = bytestream2_get_be32(&gb);
317 if (len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
318 bytestream2_skip(&gb, 8); /* unused by decoder */
319 } else {
320 bytestream2_skip(&gb, 4); /* unused by decoder */
321 }
322
323 pos = bytestream2_tell(&gb);
324 if (skip <= pos)
325 return AVERROR_INVALIDDATA;
326 bitstream_init8(&ctx->bc, buf + pos, skip - pos);
327 if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)
328 return ret;
329 bytestream2_skip(&gb, ((bitstream_tell(&ctx->bc) + 31) >> 5) << 2);
330
331 toks >>= 1;
332 /* check if we have sane number of tokens */
333 if ((toks < 0) || (toks > 0xFFFFFF)) {
334 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
335 tm2_free_codes(&codes);
336 return AVERROR_INVALIDDATA;
337 }
338 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
339 ctx->tok_lens[stream_id] = toks;
340 len = bytestream2_get_be32(&gb);
341 if (len > 0) {
342 pos = bytestream2_tell(&gb);
343 if (skip <= pos)
344 return AVERROR_INVALIDDATA;
345 bitstream_init8(&ctx->bc, buf + pos, skip - pos);
346 for (i = 0; i < toks; i++) {
347 if (bitstream_bits_left(&ctx->bc) <= 0) {
348 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
349 return AVERROR_INVALIDDATA;
350 }
351 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->bc, &codes);
352 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
353 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
354 ctx->tokens[stream_id][i], stream_id, i);
355 return AVERROR_INVALIDDATA;
356 }
357 }
358 } else {
359 for (i = 0; i < toks; i++) {
360 ctx->tokens[stream_id][i] = codes.recode[0];
361 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
362 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
363 ctx->tokens[stream_id][i], stream_id, i);
364 return AVERROR_INVALIDDATA;
365 }
366 }
367 }
368 tm2_free_codes(&codes);
369
370 return skip;
371 }
372
373 static inline int GET_TOK(TM2Context *ctx,int type)
374 {
375 if (ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
376 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]);
377 return 0;
378 }
379 if (type <= TM2_MOT)
380 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
381 return ctx->tokens[type][ctx->tok_ptrs[type]++];
382 }
383
384 /* blocks decoding routines */
385
386 /* common Y, U, V pointers initialisation */
387 #define TM2_INIT_POINTERS() \
388 int *last, *clast; \
389 int *Y, *U, *V;\
390 int Ystride, Ustride, Vstride;\
391 \
392 Ystride = ctx->y_stride;\
393 Vstride = ctx->uv_stride;\
394 Ustride = ctx->uv_stride;\
395 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
396 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
397 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
398 last = ctx->last + bx * 4;\
399 clast = ctx->clast + bx * 4;
400
401 #define TM2_INIT_POINTERS_2() \
402 int *Yo, *Uo, *Vo;\
403 int oYstride, oUstride, oVstride;\
404 \
405 TM2_INIT_POINTERS();\
406 oYstride = Ystride;\
407 oVstride = Vstride;\
408 oUstride = Ustride;\
409 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
410 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
411 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
412
413 /* recalculate last and delta values for next blocks */
414 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
415 CD[0] = CHR[1] - last[1];\
416 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
417 last[0] = (int)CHR[stride + 0];\
418 last[1] = (int)CHR[stride + 1];}
419
420 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
421 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
422 {
423 int ct, d;
424 int i, j;
425
426 for (j = 0; j < 4; j++){
427 ct = ctx->D[j];
428 for (i = 0; i < 4; i++){
429 d = deltas[i + j * 4];
430 ct += d;
431 last[i] += ct;
432 Y[i] = av_clip_uint8(last[i]);
433 }
434 Y += stride;
435 ctx->D[j] = ct;
436 }
437 }
438
439 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
440 {
441 int i, j;
442 for (j = 0; j < 2; j++) {
443 for (i = 0; i < 2; i++) {
444 CD[j] += deltas[i + j * 2];
445 last[i] += CD[j];
446 data[i] = last[i];
447 }
448 data += stride;
449 }
450 }
451
452 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
453 {
454 int t;
455 int l;
456 int prev;
457
458 if (bx > 0)
459 prev = clast[-3];
460 else
461 prev = 0;
462 t = (CD[0] + CD[1]) >> 1;
463 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
464 CD[1] = CD[0] + CD[1] - t;
465 CD[0] = t;
466 clast[0] = l;
467
468 tm2_high_chroma(data, stride, clast, CD, deltas);
469 }
470
471 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
472 {
473 int i;
474 int deltas[16];
475 TM2_INIT_POINTERS();
476
477 /* hi-res chroma */
478 for (i = 0; i < 4; i++) {
479 deltas[i] = GET_TOK(ctx, TM2_C_HI);
480 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
481 }
482 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
483 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
484
485 /* hi-res luma */
486 for (i = 0; i < 16; i++)
487 deltas[i] = GET_TOK(ctx, TM2_L_HI);
488
489 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
490 }
491
492 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
493 {
494 int i;
495 int deltas[16];
496 TM2_INIT_POINTERS();
497
498 /* low-res chroma */
499 deltas[0] = GET_TOK(ctx, TM2_C_LO);
500 deltas[1] = deltas[2] = deltas[3] = 0;
501 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
502
503 deltas[0] = GET_TOK(ctx, TM2_C_LO);
504 deltas[1] = deltas[2] = deltas[3] = 0;
505 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
506
507 /* hi-res luma */
508 for (i = 0; i < 16; i++)
509 deltas[i] = GET_TOK(ctx, TM2_L_HI);
510
511 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
512 }
513
514 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
515 {
516 int i;
517 int t1, t2;
518 int deltas[16];
519 TM2_INIT_POINTERS();
520
521 /* low-res chroma */
522 deltas[0] = GET_TOK(ctx, TM2_C_LO);
523 deltas[1] = deltas[2] = deltas[3] = 0;
524 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
525
526 deltas[0] = GET_TOK(ctx, TM2_C_LO);
527 deltas[1] = deltas[2] = deltas[3] = 0;
528 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
529
530 /* low-res luma */
531 for (i = 0; i < 16; i++)
532 deltas[i] = 0;
533
534 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
535 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
536 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
537 deltas[10] = GET_TOK(ctx, TM2_L_LO);
538
539 if (bx > 0)
540 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
541 else
542 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
543 last[2] = (last[1] + last[3]) >> 1;
544
545 t1 = ctx->D[0] + ctx->D[1];
546 ctx->D[0] = t1 >> 1;
547 ctx->D[1] = t1 - (t1 >> 1);
548 t2 = ctx->D[2] + ctx->D[3];
549 ctx->D[2] = t2 >> 1;
550 ctx->D[3] = t2 - (t2 >> 1);
551
552 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
553 }
554
555 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
556 {
557 int i;
558 int ct;
559 int left, right, diff;
560 int deltas[16];
561 TM2_INIT_POINTERS();
562
563 /* null chroma */
564 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
565 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
566
567 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
568 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
569
570 /* null luma */
571 for (i = 0; i < 16; i++)
572 deltas[i] = 0;
573
574 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
575
576 if (bx > 0)
577 left = last[-1] - ct;
578 else
579 left = 0;
580
581 right = last[3];
582 diff = right - left;
583 last[0] = left + (diff >> 2);
584 last[1] = left + (diff >> 1);
585 last[2] = right - (diff >> 2);
586 last[3] = right;
587 {
588 int tp = left;
589
590 ctx->D[0] = (tp + (ct >> 2)) - left;
591 left += ctx->D[0];
592 ctx->D[1] = (tp + (ct >> 1)) - left;
593 left += ctx->D[1];
594 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
595 left += ctx->D[2];
596 ctx->D[3] = (tp + ct) - left;
597 }
598 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
599 }
600
601 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
602 {
603 int i, j;
604 TM2_INIT_POINTERS_2();
605
606 /* update chroma */
607 for (j = 0; j < 2; j++) {
608 for (i = 0; i < 2; i++){
609 U[i] = Uo[i];
610 V[i] = Vo[i];
611 }
612 U += Ustride; V += Vstride;
613 Uo += oUstride; Vo += oVstride;
614 }
615 U -= Ustride * 2;
616 V -= Vstride * 2;
617 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
618 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
619
620 /* update deltas */
621 ctx->D[0] = Yo[3] - last[3];
622 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
623 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
624 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
625
626 for (j = 0; j < 4; j++) {
627 for (i = 0; i < 4; i++) {
628 Y[i] = Yo[i];
629 last[i] = Yo[i];
630 }
631 Y += Ystride;
632 Yo += oYstride;
633 }
634 }
635
636 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
637 {
638 int i, j;
639 int d;
640 TM2_INIT_POINTERS_2();
641
642 /* update chroma */
643 for (j = 0; j < 2; j++) {
644 for (i = 0; i < 2; i++) {
645 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
646 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
647 }
648 U += Ustride;
649 V += Vstride;
650 Uo += oUstride;
651 Vo += oVstride;
652 }
653 U -= Ustride * 2;
654 V -= Vstride * 2;
655 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
656 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
657
658 /* update deltas */
659 ctx->D[0] = Yo[3] - last[3];
660 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
661 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
662 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
663
664 for (j = 0; j < 4; j++) {
665 d = last[3];
666 for (i = 0; i < 4; i++) {
667 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
668 last[i] = Y[i];
669 }
670 ctx->D[j] = last[3] - d;
671 Y += Ystride;
672 Yo += oYstride;
673 }
674 }
675
676 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
677 {
678 int i, j;
679 int mx, my;
680 TM2_INIT_POINTERS_2();
681
682 mx = GET_TOK(ctx, TM2_MOT);
683 my = GET_TOK(ctx, TM2_MOT);
684 mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width - bx * 4);
685 my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
686
687 Yo += my * oYstride + mx;
688 Uo += (my >> 1) * oUstride + (mx >> 1);
689 Vo += (my >> 1) * oVstride + (mx >> 1);
690
691 /* copy chroma */
692 for (j = 0; j < 2; j++) {
693 for (i = 0; i < 2; i++) {
694 U[i] = Uo[i];
695 V[i] = Vo[i];
696 }
697 U += Ustride;
698 V += Vstride;
699 Uo += oUstride;
700 Vo += oVstride;
701 }
702 U -= Ustride * 2;
703 V -= Vstride * 2;
704 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
705 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
706
707 /* copy luma */
708 for (j = 0; j < 4; j++) {
709 for (i = 0; i < 4; i++) {
710 Y[i] = Yo[i];
711 }
712 Y += Ystride;
713 Yo += oYstride;
714 }
715 /* calculate deltas */
716 Y -= Ystride * 4;
717 ctx->D[0] = Y[3] - last[3];
718 ctx->D[1] = Y[3 + Ystride] - Y[3];
719 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
720 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
721 for (i = 0; i < 4; i++)
722 last[i] = Y[i + Ystride * 3];
723 }
724
725 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
726 {
727 int i, j;
728 int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
729 int type;
730 int keyframe = 1;
731 int *Y, *U, *V;
732 uint8_t *dst;
733
734 for (i = 0; i < TM2_NUM_STREAMS; i++)
735 ctx->tok_ptrs[i] = 0;
736
737 if (ctx->tok_lens[TM2_TYPE]<bw*bh) {
738 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
739 return AVERROR_INVALIDDATA;
740 }
741
742 memset(ctx->last, 0, 4 * bw * sizeof(int));
743 memset(ctx->clast, 0, 4 * bw * sizeof(int));
744
745 for (j = 0; j < bh; j++) {
746 memset(ctx->D, 0, 4 * sizeof(int));
747 memset(ctx->CD, 0, 4 * sizeof(int));
748 for (i = 0; i < bw; i++) {
749 type = GET_TOK(ctx, TM2_TYPE);
750 switch(type) {
751 case TM2_HI_RES:
752 tm2_hi_res_block(ctx, p, i, j);
753 break;
754 case TM2_MED_RES:
755 tm2_med_res_block(ctx, p, i, j);
756 break;
757 case TM2_LOW_RES:
758 tm2_low_res_block(ctx, p, i, j);
759 break;
760 case TM2_NULL_RES:
761 tm2_null_res_block(ctx, p, i, j);
762 break;
763 case TM2_UPDATE:
764 tm2_update_block(ctx, p, i, j);
765 keyframe = 0;
766 break;
767 case TM2_STILL:
768 tm2_still_block(ctx, p, i, j);
769 keyframe = 0;
770 break;
771 case TM2_MOTION:
772 tm2_motion_block(ctx, p, i, j);
773 keyframe = 0;
774 break;
775 default:
776 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
777 }
778 }
779 }
780
781 /* copy data from our buffer to AVFrame */
782 Y = (ctx->cur?ctx->Y2:ctx->Y1);
783 U = (ctx->cur?ctx->U2:ctx->U1);
784 V = (ctx->cur?ctx->V2:ctx->V1);
785 dst = p->data[0];
786 for (j = 0; j < h; j++) {
787 for (i = 0; i < w; i++) {
788 int y = Y[i], u = U[i >> 1], v = V[i >> 1];
789 dst[3*i+0] = av_clip_uint8(y + v);
790 dst[3*i+1] = av_clip_uint8(y);
791 dst[3*i+2] = av_clip_uint8(y + u);
792 }
793
794 /* horizontal edge extension */
795 Y[-4] = Y[-3] = Y[-2] = Y[-1] = Y[0];
796 Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w] = Y[w - 1];
797
798 /* vertical edge extension */
799 if (j == 0) {
800 memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
801 memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
802 memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
803 memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
804 } else if (j == h - 1) {
805 memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
806 memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
807 memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
808 memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
809 }
810
811 Y += ctx->y_stride;
812 if (j & 1) {
813 /* horizontal edge extension */
814 U[-2] = U[-1] = U[0];
815 V[-2] = V[-1] = V[0];
816 U[cw + 1] = U[cw] = U[cw - 1];
817 V[cw + 1] = V[cw] = V[cw - 1];
818
819 /* vertical edge extension */
820 if (j == 1) {
821 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
822 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
823 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
824 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
825 } else if (j == h - 1) {
826 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
827 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
828 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
829 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
830 }
831
832 U += ctx->uv_stride;
833 V += ctx->uv_stride;
834 }
835 dst += p->linesize[0];
836 }
837
838 return keyframe;
839 }
840
841 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
842 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
843 };
844
845 #define TM2_HEADER_SIZE 40
846
847 static int decode_frame(AVCodecContext *avctx,
848 void *data, int *got_frame,
849 AVPacket *avpkt)
850 {
851 TM2Context * const l = avctx->priv_data;
852 const uint8_t *buf = avpkt->data;
853 int buf_size = avpkt->size & ~3;
854 AVFrame * const p = l->pic;
855 int offset = TM2_HEADER_SIZE;
856 int i, t, ret;
857 uint8_t *swbuf;
858
859 swbuf = av_malloc(buf_size + AV_INPUT_BUFFER_PADDING_SIZE);
860 if (!swbuf) {
861 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
862 return AVERROR(ENOMEM);
863 }
864
865 if ((ret = ff_reget_buffer(avctx, p)) < 0) {
866 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
867 av_free(swbuf);
868 return ret;
869 }
870
871 l->bdsp.bswap_buf((uint32_t *) swbuf, (const uint32_t *) buf,
872 buf_size >> 2);
873
874 if ((ret = tm2_read_header(l, swbuf)) < 0) {
875 av_free(swbuf);
876 return ret;
877 }
878
879 for (i = 0; i < TM2_NUM_STREAMS; i++) {
880 if (offset >= buf_size) {
881 av_free(swbuf);
882 return AVERROR_INVALIDDATA;
883 }
884 t = tm2_read_stream(l, swbuf + offset, tm2_stream_order[i],
885 buf_size - offset);
886 if (t < 0) {
887 av_free(swbuf);
888 return t;
889 }
890 offset += t;
891 }
892 p->key_frame = tm2_decode_blocks(l, p);
893 if (p->key_frame)
894 p->pict_type = AV_PICTURE_TYPE_I;
895 else
896 p->pict_type = AV_PICTURE_TYPE_P;
897
898 l->cur = !l->cur;
899 *got_frame = 1;
900 ret = av_frame_ref(data, l->pic);
901 av_free(swbuf);
902
903 return (ret < 0) ? ret : buf_size;
904 }
905
906 static av_cold int decode_init(AVCodecContext *avctx)
907 {
908 TM2Context * const l = avctx->priv_data;
909 int i, w = avctx->width, h = avctx->height;
910
911 if ((avctx->width & 3) || (avctx->height & 3)) {
912 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
913 return AVERROR(EINVAL);
914 }
915
916 l->avctx = avctx;
917 avctx->pix_fmt = AV_PIX_FMT_BGR24;
918
919 l->pic = av_frame_alloc();
920 if (!l->pic)
921 return AVERROR(ENOMEM);
922
923 ff_bswapdsp_init(&l->bdsp);
924
925 l->last = av_malloc(4 * sizeof(*l->last) * (w >> 2));
926 l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));
927
928 for (i = 0; i < TM2_NUM_STREAMS; i++) {
929 l->tokens[i] = NULL;
930 l->tok_lens[i] = 0;
931 }
932
933 w += 8;
934 h += 8;
935 l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);
936 l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);
937 l->y_stride = w;
938 w = (w + 1) >> 1;
939 h = (h + 1) >> 1;
940 l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);
941 l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);
942 l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);
943 l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);
944 l->uv_stride = w;
945 l->cur = 0;
946 if (!l->Y1_base || !l->Y2_base || !l->U1_base ||
947 !l->V1_base || !l->U2_base || !l->V2_base ||
948 !l->last || !l->clast) {
949 av_freep(&l->Y1_base);
950 av_freep(&l->Y2_base);
951 av_freep(&l->U1_base);
952 av_freep(&l->U2_base);
953 av_freep(&l->V1_base);
954 av_freep(&l->V2_base);
955 av_freep(&l->last);
956 av_freep(&l->clast);
957 return AVERROR(ENOMEM);
958 }
959 l->Y1 = l->Y1_base + l->y_stride * 4 + 4;
960 l->Y2 = l->Y2_base + l->y_stride * 4 + 4;
961 l->U1 = l->U1_base + l->uv_stride * 2 + 2;
962 l->U2 = l->U2_base + l->uv_stride * 2 + 2;
963 l->V1 = l->V1_base + l->uv_stride * 2 + 2;
964 l->V2 = l->V2_base + l->uv_stride * 2 + 2;
965
966 return 0;
967 }
968
969 static av_cold int decode_end(AVCodecContext *avctx)
970 {
971 TM2Context * const l = avctx->priv_data;
972 int i;
973
974 av_free(l->last);
975 av_free(l->clast);
976 for (i = 0; i < TM2_NUM_STREAMS; i++)
977 av_free(l->tokens[i]);
978 if (l->Y1) {
979 av_free(l->Y1_base);
980 av_free(l->U1_base);
981 av_free(l->V1_base);
982 av_free(l->Y2_base);
983 av_free(l->U2_base);
984 av_free(l->V2_base);
985 }
986
987 av_frame_free(&l->pic);
988
989 return 0;
990 }
991
992 AVCodec ff_truemotion2_decoder = {
993 .name = "truemotion2",
994 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
995 .type = AVMEDIA_TYPE_VIDEO,
996 .id = AV_CODEC_ID_TRUEMOTION2,
997 .priv_data_size = sizeof(TM2Context),
998 .init = decode_init,
999 .close = decode_end,
1000 .decode = decode_frame,
1001 .capabilities = AV_CODEC_CAP_DR1,
1002 };