2 * Duck/ON2 TrueMotion 2 Decoder
3 * Copyright (c) 2005 Konstantin Shishkov
5 * This file is part of Libav.
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.
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.
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
24 * Duck TrueMotion2 decoder.
28 #include "bytestream.h"
33 #define TM2_ESCAPE 0x80000000
36 /* Huffman-coded streams of different types of blocks */
59 typedef struct TM2Context {
60 AVCodecContext *avctx;
67 int *tokens[TM2_NUM_STREAMS];
68 int tok_lens[TM2_NUM_STREAMS];
69 int tok_ptrs[TM2_NUM_STREAMS];
70 int deltas[TM2_NUM_STREAMS][TM2_DELTAS];
71 /* for blocks decoding */
77 /* data for current and previous frame */
78 int *Y1_base, *U1_base, *V1_base, *Y2_base, *U2_base, *V2_base;
79 int *Y1, *U1, *V1, *Y2, *U2, *V2;
80 int y_stride, uv_stride;
85 * Huffman codes for each of streams
87 typedef struct TM2Codes {
88 VLC vlc; ///< table for Libav bitstream reader
90 int *recode; ///< table for converting from code indexes to values
95 * structure for gathering Huffman codes information
97 typedef struct TM2Huff {
98 int val_bits; ///< length of literal
99 int max_bits; ///< maximum length of code
100 int min_bits; ///< minimum length of code
101 int nodes; ///< total number of nodes in tree
102 int num; ///< current number filled
103 int max_num; ///< total number of codes
104 int *nums; ///< literals
105 uint32_t *bits; ///< codes
106 int *lens; ///< codelengths
109 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
112 if (length > huff->max_bits) {
113 av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n",
115 return AVERROR_INVALIDDATA;
118 if (!get_bits1(&ctx->gb)) { /* literal */
122 if (huff->num >= huff->max_num) {
123 av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
124 return AVERROR_INVALIDDATA;
126 huff->nums[huff->num] = get_bits_long(&ctx->gb, huff->val_bits);
127 huff->bits[huff->num] = prefix;
128 huff->lens[huff->num] = length;
131 } else { /* non-terminal node */
132 if ((ret = tm2_read_tree(ctx, prefix << 1, length + 1, huff)) < 0)
134 if ((ret = tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff)) < 0)
140 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
145 huff.val_bits = get_bits(&ctx->gb, 5);
146 huff.max_bits = get_bits(&ctx->gb, 5);
147 huff.min_bits = get_bits(&ctx->gb, 5);
148 huff.nodes = get_bits_long(&ctx->gb, 17);
151 /* check for correct codes parameters */
152 if ((huff.val_bits < 1) || (huff.val_bits > 32) ||
153 (huff.max_bits < 0) || (huff.max_bits > 25)) {
154 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect tree parameters - literal "
155 "length: %i, max code length: %i\n", huff.val_bits, huff.max_bits);
156 return AVERROR_INVALIDDATA;
158 if ((huff.nodes <= 0) || (huff.nodes > 0x10000)) {
159 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of Huffman tree "
160 "nodes: %i\n", huff.nodes);
161 return AVERROR_INVALIDDATA;
164 if (huff.max_bits == 0)
167 /* allocate space for codes - it is exactly ceil(nodes / 2) entries */
168 huff.max_num = (huff.nodes + 1) >> 1;
169 huff.nums = av_mallocz(huff.max_num * sizeof(int));
170 huff.bits = av_mallocz(huff.max_num * sizeof(uint32_t));
171 huff.lens = av_mallocz(huff.max_num * sizeof(int));
173 res = tm2_read_tree(ctx, 0, 0, &huff);
175 if (huff.num != huff.max_num) {
176 av_log(ctx->avctx, AV_LOG_ERROR, "Got less codes than expected: %i of %i\n",
177 huff.num, huff.max_num);
178 res = AVERROR_INVALIDDATA;
181 /* convert codes to vlc_table */
185 res = init_vlc(&code->vlc, huff.max_bits, huff.max_num,
186 huff.lens, sizeof(int), sizeof(int),
187 huff.bits, sizeof(uint32_t), sizeof(uint32_t), 0);
189 av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
191 code->bits = huff.max_bits;
192 code->length = huff.max_num;
193 code->recode = av_malloc(code->length * sizeof(int));
194 for (i = 0; i < code->length; i++)
195 code->recode[i] = huff.nums[i];
198 /* free allocated memory */
206 static void tm2_free_codes(TM2Codes *code)
208 av_free(code->recode);
210 ff_free_vlc(&code->vlc);
213 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
216 val = get_vlc2(gb, code->vlc.table, code->bits, 1);
217 return code->recode[val];
220 #define TM2_OLD_HEADER_MAGIC 0x00000100
221 #define TM2_NEW_HEADER_MAGIC 0x00000101
223 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
225 uint32_t magic = AV_RL32(buf);
228 case TM2_OLD_HEADER_MAGIC:
229 avpriv_request_sample(ctx->avctx, "Old TM2 header");
231 case TM2_NEW_HEADER_MAGIC:
234 av_log(ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
235 return AVERROR_INVALIDDATA;
239 static int tm2_read_deltas(TM2Context *ctx, int stream_id)
244 d = get_bits(&ctx->gb, 9);
245 mb = get_bits(&ctx->gb, 5);
247 if ((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
248 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
249 return AVERROR_INVALIDDATA;
252 for (i = 0; i < d; i++) {
253 v = get_bits_long(&ctx->gb, mb);
254 if (v & (1 << (mb - 1)))
255 ctx->deltas[stream_id][i] = v - (1 << mb);
257 ctx->deltas[stream_id][i] = v;
259 for (; i < TM2_DELTAS; i++)
260 ctx->deltas[stream_id][i] = 0;
265 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id, int buf_size)
273 /* get stream length in dwords */
274 bytestream2_init(&gb, buf, buf_size);
275 len = bytestream2_get_be32(&gb);
281 if (len >= INT_MAX/4-1 || len < 0 || len > buf_size) {
282 av_log(ctx->avctx, AV_LOG_ERROR, "Error, invalid stream size.\n");
283 return AVERROR_INVALIDDATA;
286 toks = bytestream2_get_be32(&gb);
288 len = bytestream2_get_be32(&gb);
289 if (len == TM2_ESCAPE) {
290 len = bytestream2_get_be32(&gb);
293 pos = bytestream2_tell(&gb);
295 return AVERROR_INVALIDDATA;
296 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
297 if ((ret = tm2_read_deltas(ctx, stream_id)) < 0)
299 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
302 /* skip unused fields */
303 len = bytestream2_get_be32(&gb);
304 if (len == TM2_ESCAPE) { /* some unknown length - could be escaped too */
305 bytestream2_skip(&gb, 8); /* unused by decoder */
307 bytestream2_skip(&gb, 4); /* unused by decoder */
310 pos = bytestream2_tell(&gb);
312 return AVERROR_INVALIDDATA;
313 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
314 if ((ret = tm2_build_huff_table(ctx, &codes)) < 0)
316 bytestream2_skip(&gb, ((get_bits_count(&ctx->gb) + 31) >> 5) << 2);
319 /* check if we have sane number of tokens */
320 if ((toks < 0) || (toks > 0xFFFFFF)) {
321 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
322 tm2_free_codes(&codes);
323 return AVERROR_INVALIDDATA;
325 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
326 ctx->tok_lens[stream_id] = toks;
327 len = bytestream2_get_be32(&gb);
329 pos = bytestream2_tell(&gb);
331 return AVERROR_INVALIDDATA;
332 init_get_bits(&ctx->gb, buf + pos, (skip - pos) * 8);
333 for (i = 0; i < toks; i++) {
334 if (get_bits_left(&ctx->gb) <= 0) {
335 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
336 return AVERROR_INVALIDDATA;
338 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
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 for (i = 0; i < toks; i++) {
347 ctx->tokens[stream_id][i] = codes.recode[0];
348 if (stream_id <= TM2_MOT && ctx->tokens[stream_id][i] >= TM2_DELTAS) {
349 av_log(ctx->avctx, AV_LOG_ERROR, "Invalid delta token index %d for type %d, n=%d\n",
350 ctx->tokens[stream_id][i], stream_id, i);
351 return AVERROR_INVALIDDATA;
355 tm2_free_codes(&codes);
360 static inline int GET_TOK(TM2Context *ctx,int type)
362 if (ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
363 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]);
367 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
368 return ctx->tokens[type][ctx->tok_ptrs[type]++];
371 /* blocks decoding routines */
373 /* common Y, U, V pointers initialisation */
374 #define TM2_INIT_POINTERS() \
377 int Ystride, Ustride, Vstride;\
379 Ystride = ctx->y_stride;\
380 Vstride = ctx->uv_stride;\
381 Ustride = ctx->uv_stride;\
382 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
383 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
384 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
385 last = ctx->last + bx * 4;\
386 clast = ctx->clast + bx * 4;
388 #define TM2_INIT_POINTERS_2() \
390 int oYstride, oUstride, oVstride;\
392 TM2_INIT_POINTERS();\
396 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
397 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
398 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
400 /* recalculate last and delta values for next blocks */
401 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
402 CD[0] = CHR[1] - last[1];\
403 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
404 last[0] = (int)CHR[stride + 0];\
405 last[1] = (int)CHR[stride + 1];}
407 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
408 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
413 for (j = 0; j < 4; j++){
415 for (i = 0; i < 4; i++){
416 d = deltas[i + j * 4];
419 Y[i] = av_clip_uint8(last[i]);
426 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
429 for (j = 0; j < 2; j++) {
430 for (i = 0; i < 2; i++) {
431 CD[j] += deltas[i + j * 2];
439 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
449 t = (CD[0] + CD[1]) >> 1;
450 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
451 CD[1] = CD[0] + CD[1] - t;
455 tm2_high_chroma(data, stride, clast, CD, deltas);
458 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
465 for (i = 0; i < 4; i++) {
466 deltas[i] = GET_TOK(ctx, TM2_C_HI);
467 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
469 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
470 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
473 for (i = 0; i < 16; i++)
474 deltas[i] = GET_TOK(ctx, TM2_L_HI);
476 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
479 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
486 deltas[0] = GET_TOK(ctx, TM2_C_LO);
487 deltas[1] = deltas[2] = deltas[3] = 0;
488 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
490 deltas[0] = GET_TOK(ctx, TM2_C_LO);
491 deltas[1] = deltas[2] = deltas[3] = 0;
492 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
495 for (i = 0; i < 16; i++)
496 deltas[i] = GET_TOK(ctx, TM2_L_HI);
498 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
501 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
509 deltas[0] = GET_TOK(ctx, TM2_C_LO);
510 deltas[1] = deltas[2] = deltas[3] = 0;
511 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
513 deltas[0] = GET_TOK(ctx, TM2_C_LO);
514 deltas[1] = deltas[2] = deltas[3] = 0;
515 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
518 for (i = 0; i < 16; i++)
521 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
522 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
523 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
524 deltas[10] = GET_TOK(ctx, TM2_L_LO);
527 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
529 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
530 last[2] = (last[1] + last[3]) >> 1;
532 t1 = ctx->D[0] + ctx->D[1];
534 ctx->D[1] = t1 - (t1 >> 1);
535 t2 = ctx->D[2] + ctx->D[3];
537 ctx->D[3] = t2 - (t2 >> 1);
539 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
542 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
546 int left, right, diff;
551 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
552 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
554 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
555 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
558 for (i = 0; i < 16; i++)
561 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
564 left = last[-1] - ct;
570 last[0] = left + (diff >> 2);
571 last[1] = left + (diff >> 1);
572 last[2] = right - (diff >> 2);
577 ctx->D[0] = (tp + (ct >> 2)) - left;
579 ctx->D[1] = (tp + (ct >> 1)) - left;
581 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
583 ctx->D[3] = (tp + ct) - left;
585 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
588 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
591 TM2_INIT_POINTERS_2();
594 for (j = 0; j < 2; j++) {
595 for (i = 0; i < 2; i++){
599 U += Ustride; V += Vstride;
600 Uo += oUstride; Vo += oVstride;
604 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
605 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
608 ctx->D[0] = Yo[3] - last[3];
609 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
610 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
611 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
613 for (j = 0; j < 4; j++) {
614 for (i = 0; i < 4; i++) {
623 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
627 TM2_INIT_POINTERS_2();
630 for (j = 0; j < 2; j++) {
631 for (i = 0; i < 2; i++) {
632 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
633 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
642 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
643 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
646 ctx->D[0] = Yo[3] - last[3];
647 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
648 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
649 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
651 for (j = 0; j < 4; j++) {
653 for (i = 0; i < 4; i++) {
654 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
657 ctx->D[j] = last[3] - d;
663 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
667 TM2_INIT_POINTERS_2();
669 mx = GET_TOK(ctx, TM2_MOT);
670 my = GET_TOK(ctx, TM2_MOT);
671 mx = av_clip(mx, -(bx * 4 + 4), ctx->avctx->width - bx * 4);
672 my = av_clip(my, -(by * 4 + 4), ctx->avctx->height - by * 4);
674 Yo += my * oYstride + mx;
675 Uo += (my >> 1) * oUstride + (mx >> 1);
676 Vo += (my >> 1) * oVstride + (mx >> 1);
679 for (j = 0; j < 2; j++) {
680 for (i = 0; i < 2; i++) {
691 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
692 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
695 for (j = 0; j < 4; j++) {
696 for (i = 0; i < 4; i++) {
702 /* calculate deltas */
704 ctx->D[0] = Y[3] - last[3];
705 ctx->D[1] = Y[3 + Ystride] - Y[3];
706 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
707 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
708 for (i = 0; i < 4; i++)
709 last[i] = Y[i + Ystride * 3];
712 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
715 int w = ctx->avctx->width, h = ctx->avctx->height, bw = w >> 2, bh = h >> 2, cw = w >> 1;
721 for (i = 0; i < TM2_NUM_STREAMS; i++)
722 ctx->tok_ptrs[i] = 0;
724 if (ctx->tok_lens[TM2_TYPE]<bw*bh) {
725 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
726 return AVERROR_INVALIDDATA;
729 memset(ctx->last, 0, 4 * bw * sizeof(int));
730 memset(ctx->clast, 0, 4 * bw * sizeof(int));
732 for (j = 0; j < bh; j++) {
733 memset(ctx->D, 0, 4 * sizeof(int));
734 memset(ctx->CD, 0, 4 * sizeof(int));
735 for (i = 0; i < bw; i++) {
736 type = GET_TOK(ctx, TM2_TYPE);
739 tm2_hi_res_block(ctx, p, i, j);
742 tm2_med_res_block(ctx, p, i, j);
745 tm2_low_res_block(ctx, p, i, j);
748 tm2_null_res_block(ctx, p, i, j);
751 tm2_update_block(ctx, p, i, j);
755 tm2_still_block(ctx, p, i, j);
759 tm2_motion_block(ctx, p, i, j);
763 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
768 /* copy data from our buffer to AVFrame */
769 Y = (ctx->cur?ctx->Y2:ctx->Y1);
770 U = (ctx->cur?ctx->U2:ctx->U1);
771 V = (ctx->cur?ctx->V2:ctx->V1);
773 for (j = 0; j < h; j++) {
774 for (i = 0; i < w; i++) {
775 int y = Y[i], u = U[i >> 1], v = V[i >> 1];
776 dst[3*i+0] = av_clip_uint8(y + v);
777 dst[3*i+1] = av_clip_uint8(y);
778 dst[3*i+2] = av_clip_uint8(y + u);
781 /* horizontal edge extension */
782 Y[-4] = Y[-3] = Y[-2] = Y[-1] = Y[0];
783 Y[w + 3] = Y[w + 2] = Y[w + 1] = Y[w] = Y[w - 1];
785 /* vertical edge extension */
787 memcpy(Y - 4 - 1 * ctx->y_stride, Y - 4, ctx->y_stride);
788 memcpy(Y - 4 - 2 * ctx->y_stride, Y - 4, ctx->y_stride);
789 memcpy(Y - 4 - 3 * ctx->y_stride, Y - 4, ctx->y_stride);
790 memcpy(Y - 4 - 4 * ctx->y_stride, Y - 4, ctx->y_stride);
791 } else if (j == h - 1) {
792 memcpy(Y - 4 + 1 * ctx->y_stride, Y - 4, ctx->y_stride);
793 memcpy(Y - 4 + 2 * ctx->y_stride, Y - 4, ctx->y_stride);
794 memcpy(Y - 4 + 3 * ctx->y_stride, Y - 4, ctx->y_stride);
795 memcpy(Y - 4 + 4 * ctx->y_stride, Y - 4, ctx->y_stride);
800 /* horizontal edge extension */
801 U[-2] = U[-1] = U[0];
802 V[-2] = V[-1] = V[0];
803 U[cw + 1] = U[cw] = U[cw - 1];
804 V[cw + 1] = V[cw] = V[cw - 1];
806 /* vertical edge extension */
808 memcpy(U - 2 - 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
809 memcpy(V - 2 - 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
810 memcpy(U - 2 - 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
811 memcpy(V - 2 - 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
812 } else if (j == h - 1) {
813 memcpy(U - 2 + 1 * ctx->uv_stride, U - 2, ctx->uv_stride);
814 memcpy(V - 2 + 1 * ctx->uv_stride, V - 2, ctx->uv_stride);
815 memcpy(U - 2 + 2 * ctx->uv_stride, U - 2, ctx->uv_stride);
816 memcpy(V - 2 + 2 * ctx->uv_stride, V - 2, ctx->uv_stride);
822 dst += p->linesize[0];
828 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
829 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
832 #define TM2_HEADER_SIZE 40
834 static int decode_frame(AVCodecContext *avctx,
835 void *data, int *got_frame,
838 TM2Context * const l = avctx->priv_data;
839 const uint8_t *buf = avpkt->data;
840 int buf_size = avpkt->size & ~3;
841 AVFrame * const p = l->pic;
842 int offset = TM2_HEADER_SIZE;
846 swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
848 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
849 return AVERROR(ENOMEM);
852 if ((ret = ff_reget_buffer(avctx, p)) < 0) {
853 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
858 l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
860 if ((ret = tm2_read_header(l, swbuf)) < 0) {
865 for (i = 0; i < TM2_NUM_STREAMS; i++) {
866 if (offset >= buf_size) {
868 return AVERROR_INVALIDDATA;
870 t = tm2_read_stream(l, swbuf + offset, tm2_stream_order[i],
878 p->key_frame = tm2_decode_blocks(l, p);
880 p->pict_type = AV_PICTURE_TYPE_I;
882 p->pict_type = AV_PICTURE_TYPE_P;
886 ret = av_frame_ref(data, l->pic);
889 return (ret < 0) ? ret : buf_size;
892 static av_cold int decode_init(AVCodecContext *avctx)
894 TM2Context * const l = avctx->priv_data;
895 int i, w = avctx->width, h = avctx->height;
897 if ((avctx->width & 3) || (avctx->height & 3)) {
898 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
899 return AVERROR(EINVAL);
903 avctx->pix_fmt = AV_PIX_FMT_BGR24;
905 l->pic = av_frame_alloc();
907 return AVERROR(ENOMEM);
909 ff_dsputil_init(&l->dsp, avctx);
911 l->last = av_malloc(4 * sizeof(*l->last) * (w >> 2));
912 l->clast = av_malloc(4 * sizeof(*l->clast) * (w >> 2));
914 for (i = 0; i < TM2_NUM_STREAMS; i++) {
921 l->Y1_base = av_malloc(sizeof(*l->Y1_base) * w * h);
922 l->Y2_base = av_malloc(sizeof(*l->Y2_base) * w * h);
926 l->U1_base = av_malloc(sizeof(*l->U1_base) * w * h);
927 l->V1_base = av_malloc(sizeof(*l->V1_base) * w * h);
928 l->U2_base = av_malloc(sizeof(*l->U2_base) * w * h);
929 l->V2_base = av_malloc(sizeof(*l->V1_base) * w * h);
932 if (!l->Y1_base || !l->Y2_base || !l->U1_base ||
933 !l->V1_base || !l->U2_base || !l->V2_base ||
934 !l->last || !l->clast) {
935 av_freep(&l->Y1_base);
936 av_freep(&l->Y2_base);
937 av_freep(&l->U1_base);
938 av_freep(&l->U2_base);
939 av_freep(&l->V1_base);
940 av_freep(&l->V2_base);
943 return AVERROR(ENOMEM);
945 l->Y1 = l->Y1_base + l->y_stride * 4 + 4;
946 l->Y2 = l->Y2_base + l->y_stride * 4 + 4;
947 l->U1 = l->U1_base + l->uv_stride * 2 + 2;
948 l->U2 = l->U2_base + l->uv_stride * 2 + 2;
949 l->V1 = l->V1_base + l->uv_stride * 2 + 2;
950 l->V2 = l->V2_base + l->uv_stride * 2 + 2;
955 static av_cold int decode_end(AVCodecContext *avctx)
957 TM2Context * const l = avctx->priv_data;
962 for (i = 0; i < TM2_NUM_STREAMS; i++)
963 av_free(l->tokens[i]);
973 av_frame_free(&l->pic);
978 AVCodec ff_truemotion2_decoder = {
979 .name = "truemotion2",
980 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),
981 .type = AVMEDIA_TYPE_VIDEO,
982 .id = AV_CODEC_ID_TRUEMOTION2,
983 .priv_data_size = sizeof(TM2Context),
986 .decode = decode_frame,
987 .capabilities = CODEC_CAP_DR1,