2 * Duck/ON2 TrueMotion 2 Decoder
3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of FFmpeg.
7 * FFmpeg 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.
12 * FFmpeg 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.
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with FFmpeg; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
24 * Duck TrueMotion2 decoder.
28 #include "bytestream.h"
32 #define TM2_ESCAPE 0x80000000
34 /* Huffman-coded streams of different types of blocks */
35 enum TM2_STREAMS{ TM2_C_HI = 0, TM2_C_LO, TM2_L_HI, TM2_L_LO,
36 TM2_UPD, TM2_MOT, TM2_TYPE, TM2_NUM_STREAMS};
38 enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
39 TM2_UPDATE, TM2_STILL, TM2_MOTION};
41 typedef struct TM2Context{
42 AVCodecContext *avctx;
52 int *tokens[TM2_NUM_STREAMS];
53 int tok_lens[TM2_NUM_STREAMS];
54 int tok_ptrs[TM2_NUM_STREAMS];
55 int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
56 /* for blocks decoding */
62 /* data for current and previous frame */
63 int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;
64 int *Y1, *U1, *V1, *Y2, *U2, *V2;
65 int y_stride, uv_stride;
70 * Huffman codes for each of streams
72 typedef struct TM2Codes{
73 VLC vlc; ///< table for FFmpeg bitstream reader
75 int *recode; ///< table for converting from code indexes to values
80 * structure for gathering Huffman codes information
82 typedef struct TM2Huff{
83 int val_bits; ///< length of literal
84 int max_bits; ///< maximum length of code
85 int min_bits; ///< minimum length of code
86 int nodes; ///< total number of nodes in tree
87 int num; ///< current number filled
88 int max_num; ///< total number of codes
89 int *nums; ///< literals
90 uint32_t *bits; ///< codes
91 int *lens; ///< codelengths
94 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
96 if(length > huff->max_bits) {
97 av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
101 if(!get_bits1(&ctx->gb)) { /* literal */
105 if(huff->num >= huff->max_num) {
106 av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
109 huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
110 huff->bits[huff->num] = prefix;
111 huff->lens[huff->num] = length;
114 } else { /* non-terminal node */
115 if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
117 if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
123 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
128 huff.val_bits = get_bits(&ctx->gb, 5);
129 huff.max_bits = get_bits(&ctx->gb, 5);
130 huff.min_bits = get_bits(&ctx->gb, 5);
131 huff.nodes = get_bits_long(&ctx->gb, 17);
134 /* check for correct codes parameters */
135 if((huff.val_bits < 1) || (huff.val_bits > 32) ||
136 (huff.max_bits < 0) || (huff.max_bits > 25)) {
137 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal length: %i, max code length: %i\n",
138 huff.val_bits, huff.max_bits);
141 if((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
142 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree nodes: %i\n", huff.nodes);
146 if(huff.max_bits == 0)
149 /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
150 huff.max_num = (huff.nodes + 1) >> 1;
151 huff.nums = av_mallocz(huff.max_num * sizeof(int));
152 huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
153 huff.lens = av_mallocz(huff.max_num * sizeof(int));
155 if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
158 if(huff.num != huff.max_num) {
159 av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
160 huff.num, huff.max_num);
164 /* convert codes to vlc_table */
168 res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
169 huff.lens, sizeof(int), sizeof(int),
170 huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
172 av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
177 code->bits = huff.max_bits;
178 code->length = huff.max_num;
179 code->recode = av_malloc(code->length * sizeof(int));
180 for(i = 0; i < code->length; i++)
181 code->recode[i] = huff.nums[i];
184 /* free allocated memory */
192 static void tm2_free_codes(TM2Codes *code)
194 av_free(code->recode);
196 ff_free_vlc(&code->vlc);
199 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
202 val = get_vlc2(gb, code->vlc.table, code->bits, 1);
205 return code->recode[val];
208 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
212 magic = AV_RL32(buf);
215 if(magic == 0x00000100) { /* old header */
216 av_log_missing_feature(ctx->avctx, "TM2 old header", 1);
218 } else if(magic == 0x00000101) { /* new header */
221 av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
226 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
230 d = get_bits(&ctx->gb, 9);
231 mb = get_bits(&ctx->gb, 5);
233 if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
234 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
238 for(i = 0; i < d; i++) {
239 v = get_bits_long(&ctx->gb, mb);
240 if(v & (1 << (mb - 1)))
241 ctx->deltas[stream_id][i] = v - (1 << mb);
243 ctx->deltas[stream_id][i] = v;
245 for(; i < TM2_DELTAS; i++)
246 ctx->deltas[stream_id][i] = 0;
251 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
260 av_log(ctx->avctx, AV_LOG_ERROR, "not enough space for len left\n");
261 return AVERROR_INVALIDDATA;
264 /* get stream length in dwords */
265 bytestream2_init(&gb, buf, buf_size);
266 len = bytestream2_get_be32(&gb);
272 if (len >= INT_MAX/4-1 || len < 0 || skip > buf_size) {
273 av_log(ctx->avctx, AV_LOG_ERROR, "invalid stream size\n");
274 return AVERROR_INVALIDDATA;
277 toks = bytestream2_get_be32(&gb);
279 len = bytestream2_get_be32(&gb);
280 if(len == TM2_ESCAPE) {
281 len = bytestream2_get_be32(&gb);
284 pos = bytestream2_tell(&gb);
286 return AVERROR_INVALIDDATA;
287 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
288 if(tm2_read_deltas(ctx, stream_id) == -1)
289 return AVERROR_INVALIDDATA;
290 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
293 /* skip unused fields */
294 len = bytestream2_get_be32(&gb);
295 if(len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
296 bytestream2_skip(&gb, 8); /* unused by decoder */
298 bytestream2_skip(&gb, 4); /* unused by decoder */
301 pos = bytestream2_tell(&gb);
303 return AVERROR_INVALIDDATA;
304 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
305 if(tm2_build_huff_table(ctx, &codes) == -1)
306 return AVERROR_INVALIDDATA;
307 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
310 /* check if we have sane number of tokens */
311 if((toks < 0) || (toks > 0xFFFFFF)){
312 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
313 tm2_free_codes(&codes);
314 return AVERROR_INVALIDDATA;
316 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
317 ctx->tok_lens[stream_id] = toks;
318 len = bytestream2_get_be32(&gb);
320 pos = bytestream2_tell(&gb);
322 return AVERROR_INVALIDDATA;
323 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
324 for(i = 0; i < toks; i++) {
325 if (get_bits_left(&ctx->gb) <= 0) {
326 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
327 return AVERROR_INVALIDDATA;
329 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
330 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS || ctx->tokens[stream_id][i]<0) {
331 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
332 ctx->tokens[stream_id][i], stream_id, i);
333 return AVERROR_INVALIDDATA;
337 for(i = 0; i < toks; i++) {
338 ctx->tokens[stream_id][i] = codes.recode[0];
339 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
340 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
341 ctx->tokens[stream_id][i], stream_id, i);
342 return AVERROR_INVALIDDATA;
346 tm2_free_codes(&codes);
351 static inline int GET_TOK(TM2Context *ctx,int type) {
352 if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
353 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]);
356 if(type <= TM2_MOT) {
357 if (ctx->tokens[type][ctx->tok_ptrs[type]] >= TM2_DELTAS) {
358 av_log(ctx->avctx, AV_LOG_ERROR, "token %d is too large\n", ctx->tokens[type][ctx->tok_ptrs[type]]);
361 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
363 return ctx->tokens[type][ctx->tok_ptrs[type]++];
366 /* blocks decoding routines */
368 /* common Y, U, V pointers initialisation */
369 #define TM2_INIT_POINTERS() \
372 int Ystride, Ustride, Vstride;\
374 Ystride = ctx->y_stride;\
375 Vstride = ctx->uv_stride;\
376 Ustride = ctx->uv_stride;\
377 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
378 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
379 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
380 last = ctx->last + bx * 4;\
381 clast = ctx->clast + bx * 4;
383 #define TM2_INIT_POINTERS_2() \
385 int oYstride, oUstride, oVstride;\
387 TM2_INIT_POINTERS();\
391 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
392 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
393 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
395 /* recalculate last and delta values for next blocks */
396 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
397 CD[0] = CHR[1] - last[1];\
398 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
399 last[0] = (int)CHR[stride + 0];\
400 last[1] = (int)CHR[stride + 1];}
402 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
403 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
408 for(j = 0; j < 4; j++){
410 for(i = 0; i < 4; i++){
411 d = deltas[i + j * 4];
414 Y[i] = av_clip_uint8(last[i]);
421 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
424 for(j = 0; j < 2; j++){
425 for(i = 0; i < 2; i++){
426 CD[j] += deltas[i + j * 2];
434 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
444 t = (CD[0] + CD[1]) >> 1;
445 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
446 CD[1] = CD[0] + CD[1] - t;
450 tm2_high_chroma(data, stride, clast, CD, deltas);
453 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
460 for(i = 0; i < 4; i++) {
461 deltas[i] = GET_TOK(ctx, TM2_C_HI);
462 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
464 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
465 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
468 for(i = 0; i < 16; i++)
469 deltas[i] = GET_TOK(ctx, TM2_L_HI);
471 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
474 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
481 deltas[0] = GET_TOK(ctx, TM2_C_LO);
482 deltas[1] = deltas[2] = deltas[3] = 0;
483 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
485 deltas[0] = GET_TOK(ctx, TM2_C_LO);
486 deltas[1] = deltas[2] = deltas[3] = 0;
487 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
490 for(i = 0; i < 16; i++)
491 deltas[i] = GET_TOK(ctx, TM2_L_HI);
493 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
496 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
504 deltas[0] = GET_TOK(ctx, TM2_C_LO);
505 deltas[1] = deltas[2] = deltas[3] = 0;
506 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
508 deltas[0] = GET_TOK(ctx, TM2_C_LO);
509 deltas[1] = deltas[2] = deltas[3] = 0;
510 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
513 for(i = 0; i < 16; i++)
516 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
517 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
518 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
519 deltas[10] = GET_TOK(ctx, TM2_L_LO);
522 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
524 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
525 last[2] = (last[1] + last[3]) >> 1;
527 t1 = ctx->D[0] + ctx->D[1];
529 ctx->D[1] = t1 - (t1 >> 1);
530 t2 = ctx->D[2] + ctx->D[3];
532 ctx->D[3] = t2 - (t2 >> 1);
534 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
537 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
541 int left, right, diff;
546 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
547 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
549 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
550 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
553 for(i = 0; i < 16; i++)
556 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
559 left = last[-1] - ct;
565 last[0] = left + (diff >> 2);
566 last[1] = left + (diff >> 1);
567 last[2] = right - (diff >> 2);
572 ctx->D[0] = (tp + (ct >> 2)) - left;
574 ctx->D[1] = (tp + (ct >> 1)) - left;
576 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
578 ctx->D[3] = (tp + ct) - left;
580 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
583 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
586 TM2_INIT_POINTERS_2();
589 for(j = 0; j < 2; j++){
590 for(i = 0; i < 2; i++){
594 U += Ustride; V += Vstride;
595 Uo += oUstride; Vo += oVstride;
599 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
600 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
603 ctx->D[0] = Yo[3] - last[3];
604 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
605 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
606 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
608 for(j = 0; j < 4; j++){
609 for(i = 0; i < 4; i++){
618 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
622 TM2_INIT_POINTERS_2();
625 for(j = 0; j < 2; j++){
626 for(i = 0; i < 2; i++){
627 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
628 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
630 U += Ustride; V += Vstride;
631 Uo += oUstride; Vo += oVstride;
635 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
636 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
639 ctx->D[0] = Yo[3] - last[3];
640 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
641 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
642 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
644 for(j = 0; j < 4; j++){
646 for(i = 0; i < 4; i++){
647 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
650 ctx->D[j] = last[3] - d;
656 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
660 TM2_INIT_POINTERS_2();
662 mx = GET_TOK(ctx, TM2_MOT);
663 my = GET_TOK(ctx, TM2_MOT);
664 mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width - bx * 4);
665 my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
667 if (4*bx+mx<0 || 4*by+my<0 || 4*bx+mx+4 > ctx->avctx->width || 4*by+my+4 > ctx->avctx->height) {
668 av_log(ctx->avctx, AV_LOG_ERROR, "MV out of picture\n");
672 Yo += my * oYstride + mx;
673 Uo += (my >> 1) * oUstride + (mx >> 1);
674 Vo += (my >> 1) * oVstride + (mx >> 1);
677 for(j = 0; j < 2; j++){
678 for(i = 0; i < 2; i++){
682 U += Ustride; V += Vstride;
683 Uo += oUstride; Vo += oVstride;
687 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
688 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
691 for(j = 0; j < 4; j++){
692 for(i = 0; i < 4; i++){
698 /* calculate deltas */
700 ctx->D[0] = Y[3] - last[3];
701 ctx->D[1] = Y[3 + Ystride] - Y[3];
702 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
703 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
704 for(i = 0; i < 4; i++)
705 last[i] = Y[i + Ystride * 3];
708 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
711 int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
717 for(i = 0; i < TM2_NUM_STREAMS; i++)
718 ctx->tok_ptrs[i] = 0;
720 if (ctx->tok_lens[TM2_TYPE]<bw*bh){
721 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
725 memset(ctx->last, 0, 4 * bw * sizeof(int));
726 memset(ctx->clast, 0, 4 * bw * sizeof(int));
728 for(j = 0; j < bh; j++) {
729 memset(ctx->D, 0, 4 * sizeof(int));
730 memset(ctx->CD, 0, 4 * sizeof(int));
731 for(i = 0; i < bw; i++) {
732 type = GET_TOK(ctx, TM2_TYPE);
735 tm2_hi_res_block(ctx, p, i, j);
738 tm2_med_res_block(ctx, p, i, j);
741 tm2_low_res_block(ctx, p, i, j);
744 tm2_null_res_block(ctx, p, i, j);
747 tm2_update_block(ctx, p, i, j);
751 tm2_still_block(ctx, p, i, j);
755 tm2_motion_block(ctx, p, i, j);
759 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
764 /* copy data from our buffer to AVFrame */
765 Y = (ctx->cur?ctx->Y2:ctx->Y1);
766 U = (ctx->cur?ctx->U2:ctx->U1);
767 V = (ctx->cur?ctx->V2:ctx->V1);
769 for(j = 0; j < h; j++){
770 for(i = 0; i < w; i++){
771 int y = Y[i], u = U[i >> 1], v = V[i >> 1];
772 dst[3*i+0] = av_clip_uint8(y + v);
773 dst[3*i+1] = av_clip_uint8(y);
774 dst[3*i+2] = av_clip_uint8(y + u);
777 /* horizontal edge extension */
778 Y[-4] = Y[-3] = Y[-2] = Y[-1] = Y[0];
779 Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w] = Y[w - 1];
781 /* vertical edge extension */
783 memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
784 memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
785 memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
786 memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
787 } else if (j == h - 1) {
788 memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
789 memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
790 memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
791 memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
796 /* horizontal edge extension */
797 U[-2] = U[-1] = U[0];
798 V[-2] = V[-1] = V[0];
799 U[cw + 1] = U[cw] = U[cw - 1];
800 V[cw + 1] = V[cw] = V[cw - 1];
802 /* vertical edge extension */
804 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
805 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
806 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
807 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
808 } else if (j == h - 1) {
809 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
810 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
811 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
812 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
818 dst += p->linesize[0];
824 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
825 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
828 static int decode_frame(AVCodecContext *avctx,
829 void *data, int *got_frame,
832 const uint8_t *buf = avpkt->data;
833 int buf_size = avpkt->size & ~3;
834 TM2Context * const l = avctx->priv_data;
835 AVFrame * const p = &l->pic;
838 av_fast_padded_malloc(&l->buffer, &l->buffer_size, buf_size);
840 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
841 return AVERROR(ENOMEM);
844 p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
845 if((ret = avctx->reget_buffer(avctx, p)) < 0){
846 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
850 l->dsp.bswap_buf((uint32_t*)l->buffer, (const uint32_t*)buf, buf_size >> 2);
851 skip = tm2_read_header(l, l->buffer);
854 return AVERROR_INVALIDDATA;
857 for(i = 0; i < TM2_NUM_STREAMS; i++){
858 if (skip >= buf_size) {
859 av_log(avctx, AV_LOG_ERROR, "no space for tm2_read_stream\n");
860 return AVERROR_INVALIDDATA;
863 t = tm2_read_stream(l, l->buffer + skip, tm2_stream_order[i], buf_size - skip);
869 p->key_frame = tm2_decode_blocks(l, p);
871 p->pict_type = AV_PICTURE_TYPE_I;
873 p->pict_type = AV_PICTURE_TYPE_P;
877 *(AVFrame*)data = l->pic;
882 static av_cold int decode_init(AVCodecContext *avctx){
883 TM2Context * const l = avctx->priv_data;
884 int i, w = avctx->width, h = avctx->height;
886 if((avctx->width & 3) || (avctx->height & 3)){
887 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
888 return AVERROR_INVALIDDATA;
893 avctx->pix_fmt = AV_PIX_FMT_BGR24;
894 avcodec_get_frame_defaults(&l->pic);
896 ff_dsputil_init(&l->dsp, avctx);
898 l->last = av_malloc(4 * sizeof(*l->last) * (w >> 2));
899 l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));
901 for(i = 0; i < TM2_NUM_STREAMS; i++) {
908 l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);
909 l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);
913 l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);
914 l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);
915 l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);
916 l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);
919 if (!l->Y1_base || !l->Y2_base || !l->U1_base ||
920 !l->V1_base || !l->U2_base || !l->V2_base ||
921 !l->last || !l->clast) {
922 av_freep(l->Y1_base);
923 av_freep(l->Y2_base);
924 av_freep(l->U1_base);
925 av_freep(l->U2_base);
926 av_freep(l->V1_base);
927 av_freep(l->V2_base);
930 return AVERROR(ENOMEM);
932 l->Y1 = l->Y1_base + l->y_stride * 4 + 4;
933 l->Y2 = l->Y2_base + l->y_stride * 4 + 4;
934 l->U1 = l->U1_base + l->uv_stride * 2 + 2;
935 l->U2 = l->U2_base + l->uv_stride * 2 + 2;
936 l->V1 = l->V1_base + l->uv_stride * 2 + 2;
937 l->V2 = l->V2_base + l->uv_stride * 2 + 2;
942 static av_cold int decode_end(AVCodecContext *avctx){
943 TM2Context * const l = avctx->priv_data;
944 AVFrame *pic = &l->pic;
949 for(i = 0; i < TM2_NUM_STREAMS; i++)
950 av_free(l->tokens[i]);
959 av_freep(&l->buffer);
963 avctx->release_buffer(avctx, pic);
968 AVCodec ff_truemotion2_decoder = {
969 .name = "truemotion2",
970 .type = AVMEDIA_TYPE_VIDEO,
971 .id = AV_CODEC_ID_TRUEMOTION2,
972 .priv_data_size = sizeof(TM2Context),
975 .decode = decode_frame,
976 .capabilities = CODEC_CAP_DR1,
977 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),