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
23 * @file libavcodec/truemotion2.c
24 * Duck TrueMotion2 decoder.
28 #include "bitstream.h"
31 #define TM2_ESCAPE 0x80000000
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};
37 enum TM2_BLOCKS{ TM2_HI_RES = 0, TM2_MED_RES, TM2_LOW_RES, TM2_NULL_RES,
38 TM2_UPDATE, TM2_STILL, TM2_MOTION};
40 typedef struct TM2Context{
41 AVCodecContext *avctx;
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 */
58 /* data for current and previous frame */
59 int *Y1, *U1, *V1, *Y2, *U2, *V2;
64 * Huffman codes for each of streams
66 typedef struct TM2Codes{
67 VLC vlc; ///< table for FFmpeg bitstream reader
69 int *recode; ///< table for converting from code indexes to values
74 * structure for gathering Huffman codes information
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
88 static int tm2_read_tree(TM2Context *ctx, uint32_t prefix, int length, TM2Huff *huff)
90 if(length > huff->max_bits) {
91 av_log(ctx->avctx, AV_LOG_ERROR, "Tree exceeded its given depth (%i)\n", huff->max_bits);
95 if(!get_bits1(&ctx->gb)) { /* literal */
99 if(huff->num >= huff->max_num) {
100 av_log(ctx->avctx, AV_LOG_DEBUG, "Too many literals\n");
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;
108 } else { /* non-terminal node */
109 if(tm2_read_tree(ctx, prefix << 1, length + 1, huff) == -1)
111 if(tm2_read_tree(ctx, (prefix << 1) | 1, length + 1, huff) == -1)
117 static int tm2_build_huff_table(TM2Context *ctx, TM2Codes *code)
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);
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);
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);
140 if(huff.max_bits == 0)
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));
149 if(tm2_read_tree(ctx, 0, 0, &huff) == -1)
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);
158 /* convert codes to vlc_table */
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);
166 av_log(ctx->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
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];
178 /* free allocated memory */
186 static void tm2_free_codes(TM2Codes *code)
189 av_free(code->recode);
191 free_vlc(&code->vlc);
194 static inline int tm2_get_token(GetBitContext *gb, TM2Codes *code)
197 val = get_vlc2(gb, code->vlc.table, code->bits, 1);
198 return code->recode[val];
201 static inline int tm2_read_header(TM2Context *ctx, const uint8_t *buf)
209 magic = AV_RL32(buf);
212 if(magic == 0x00000100) { /* old header */
213 /* av_log (ctx->avctx, AV_LOG_ERROR, "TM2 old header: not implemented (yet)\n"); */
215 } else if(magic == 0x00000101) { /* new header */
216 int w, h, size, flags, xr, yr;
218 length = AV_RL32(buf);
221 init_get_bits(&ctx->gb, buf, 32 * 8);
222 size = get_bits_long(&ctx->gb, 31);
223 h = get_bits(&ctx->gb, 15);
224 w = get_bits(&ctx->gb, 15);
225 flags = get_bits_long(&ctx->gb, 31);
226 yr = get_bits(&ctx->gb, 9);
227 xr = get_bits(&ctx->gb, 9);
231 av_log (ctx->avctx, AV_LOG_ERROR, "Not a TM2 header: 0x%08X\n", magic);
238 static int tm2_read_deltas(TM2Context *ctx, int stream_id) {
242 d = get_bits(&ctx->gb, 9);
243 mb = get_bits(&ctx->gb, 5);
245 if((d < 1) || (d > TM2_DELTAS) || (mb < 1) || (mb > 32)) {
246 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect delta table: %i deltas x %i bits\n", d, mb);
250 for(i = 0; i < d; i++) {
251 v = get_bits_long(&ctx->gb, mb);
252 if(v & (1 << (mb - 1)))
253 ctx->deltas[stream_id][i] = v - (1 << mb);
255 ctx->deltas[stream_id][i] = v;
257 for(; i < TM2_DELTAS; i++)
258 ctx->deltas[stream_id][i] = 0;
263 static int tm2_read_stream(TM2Context *ctx, const uint8_t *buf, int stream_id) {
270 /* get stream length in dwords */
271 len = AV_RB32(buf); buf += 4; cur += 4;
277 toks = AV_RB32(buf); buf += 4; cur += 4;
279 len = AV_RB32(buf); buf += 4; cur += 4;
280 if(len == TM2_ESCAPE) {
281 len = AV_RB32(buf); buf += 4; cur += 4;
284 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
285 if(tm2_read_deltas(ctx, stream_id) == -1)
287 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
288 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
291 /* skip unused fields */
292 if(AV_RB32(buf) == TM2_ESCAPE) {
293 buf += 4; cur += 4; /* some unknown length - could be escaped too */
296 buf += 4; cur += 4; /* unused by decoder */
298 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
299 if(tm2_build_huff_table(ctx, &codes) == -1)
301 buf += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
302 cur += ((get_bits_count(&ctx->gb) + 31) >> 5) << 2;
305 /* check if we have sane number of tokens */
306 if((toks < 0) || (toks > 0xFFFFFF)){
307 av_log(ctx->avctx, AV_LOG_ERROR, "Incorrect number of tokens: %i\n", toks);
308 tm2_free_codes(&codes);
311 ctx->tokens[stream_id] = av_realloc(ctx->tokens[stream_id], toks * sizeof(int));
312 ctx->tok_lens[stream_id] = toks;
313 len = AV_RB32(buf); buf += 4; cur += 4;
315 init_get_bits(&ctx->gb, buf, (skip - cur) * 8);
316 for(i = 0; i < toks; i++)
317 ctx->tokens[stream_id][i] = tm2_get_token(&ctx->gb, &codes);
319 for(i = 0; i < toks; i++)
320 ctx->tokens[stream_id][i] = codes.recode[0];
322 tm2_free_codes(&codes);
327 static inline int GET_TOK(TM2Context *ctx,int type) {
328 if(ctx->tok_ptrs[type] >= ctx->tok_lens[type]) {
329 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]);
333 return ctx->deltas[type][ctx->tokens[type][ctx->tok_ptrs[type]++]];
334 return ctx->tokens[type][ctx->tok_ptrs[type]++];
337 /* blocks decoding routines */
339 /* common Y, U, V pointers initialisation */
340 #define TM2_INIT_POINTERS() \
343 int Ystride, Ustride, Vstride;\
345 Ystride = ctx->avctx->width;\
346 Vstride = (ctx->avctx->width + 1) >> 1;\
347 Ustride = (ctx->avctx->width + 1) >> 1;\
348 Y = (ctx->cur?ctx->Y2:ctx->Y1) + by * 4 * Ystride + bx * 4;\
349 V = (ctx->cur?ctx->V2:ctx->V1) + by * 2 * Vstride + bx * 2;\
350 U = (ctx->cur?ctx->U2:ctx->U1) + by * 2 * Ustride + bx * 2;\
351 last = ctx->last + bx * 4;\
352 clast = ctx->clast + bx * 4;
354 #define TM2_INIT_POINTERS_2() \
356 int oYstride, oUstride, oVstride;\
358 TM2_INIT_POINTERS();\
362 Yo = (ctx->cur?ctx->Y1:ctx->Y2) + by * 4 * oYstride + bx * 4;\
363 Vo = (ctx->cur?ctx->V1:ctx->V2) + by * 2 * oVstride + bx * 2;\
364 Uo = (ctx->cur?ctx->U1:ctx->U2) + by * 2 * oUstride + bx * 2;
366 /* recalculate last and delta values for next blocks */
367 #define TM2_RECALC_BLOCK(CHR, stride, last, CD) {\
368 CD[0] = (CHR[1] - 128) - last[1];\
369 CD[1] = (int)CHR[stride + 1] - (int)CHR[1];\
370 last[0] = (int)CHR[stride + 0] - 128;\
371 last[1] = (int)CHR[stride + 1] - 128;}
373 /* common operations - add deltas to 4x4 block of luma or 2x2 blocks of chroma */
374 static inline void tm2_apply_deltas(TM2Context *ctx, int* Y, int stride, int *deltas, int *last)
379 for(j = 0; j < 4; j++){
381 for(i = 0; i < 4; i++){
382 d = deltas[i + j * 4];
385 Y[i] = av_clip_uint8(last[i]);
392 static inline void tm2_high_chroma(int *data, int stride, int *last, int *CD, int *deltas)
395 for(j = 0; j < 2; j++){
396 for(i = 0; i < 2; i++){
397 CD[j] += deltas[i + j * 2];
399 data[i] = last[i] + 128;
405 static inline void tm2_low_chroma(int *data, int stride, int *clast, int *CD, int *deltas, int bx)
415 t = (CD[0] + CD[1]) >> 1;
416 l = (prev - CD[0] - CD[1] + clast[1]) >> 1;
417 CD[1] = CD[0] + CD[1] - t;
421 tm2_high_chroma(data, stride, clast, CD, deltas);
424 static inline void tm2_hi_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
431 for(i = 0; i < 4; i++) {
432 deltas[i] = GET_TOK(ctx, TM2_C_HI);
433 deltas[i + 4] = GET_TOK(ctx, TM2_C_HI);
435 tm2_high_chroma(U, Ustride, clast, ctx->CD, deltas);
436 tm2_high_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas + 4);
439 for(i = 0; i < 16; i++)
440 deltas[i] = GET_TOK(ctx, TM2_L_HI);
442 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
445 static inline void tm2_med_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
452 deltas[0] = GET_TOK(ctx, TM2_C_LO);
453 deltas[1] = deltas[2] = deltas[3] = 0;
454 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
456 deltas[0] = GET_TOK(ctx, TM2_C_LO);
457 deltas[1] = deltas[2] = deltas[3] = 0;
458 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
461 for(i = 0; i < 16; i++)
462 deltas[i] = GET_TOK(ctx, TM2_L_HI);
464 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
467 static inline void tm2_low_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
475 deltas[0] = GET_TOK(ctx, TM2_C_LO);
476 deltas[1] = deltas[2] = deltas[3] = 0;
477 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
479 deltas[0] = GET_TOK(ctx, TM2_C_LO);
480 deltas[1] = deltas[2] = deltas[3] = 0;
481 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
484 for(i = 0; i < 16; i++)
487 deltas[ 0] = GET_TOK(ctx, TM2_L_LO);
488 deltas[ 2] = GET_TOK(ctx, TM2_L_LO);
489 deltas[ 8] = GET_TOK(ctx, TM2_L_LO);
490 deltas[10] = GET_TOK(ctx, TM2_L_LO);
493 last[0] = (last[-1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3] + last[1]) >> 1;
495 last[0] = (last[1] - ctx->D[0] - ctx->D[1] - ctx->D[2] - ctx->D[3])>> 1;
496 last[2] = (last[1] + last[3]) >> 1;
498 t1 = ctx->D[0] + ctx->D[1];
500 ctx->D[1] = t1 - (t1 >> 1);
501 t2 = ctx->D[2] + ctx->D[3];
503 ctx->D[3] = t2 - (t2 >> 1);
505 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
508 static inline void tm2_null_res_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
512 int left, right, diff;
517 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
518 tm2_low_chroma(U, Ustride, clast, ctx->CD, deltas, bx);
520 deltas[0] = deltas[1] = deltas[2] = deltas[3] = 0;
521 tm2_low_chroma(V, Vstride, clast + 2, ctx->CD + 2, deltas, bx);
524 for(i = 0; i < 16; i++)
527 ct = ctx->D[0] + ctx->D[1] + ctx->D[2] + ctx->D[3];
530 left = last[-1] - ct;
536 last[0] = left + (diff >> 2);
537 last[1] = left + (diff >> 1);
538 last[2] = right - (diff >> 2);
543 ctx->D[0] = (tp + (ct >> 2)) - left;
545 ctx->D[1] = (tp + (ct >> 1)) - left;
547 ctx->D[2] = ((tp + ct) - (ct >> 2)) - left;
549 ctx->D[3] = (tp + ct) - left;
551 tm2_apply_deltas(ctx, Y, Ystride, deltas, last);
554 static inline void tm2_still_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
557 TM2_INIT_POINTERS_2();
560 for(j = 0; j < 2; j++){
561 for(i = 0; i < 2; i++){
565 U += Ustride; V += Vstride;
566 Uo += oUstride; Vo += oVstride;
570 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
571 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
574 ctx->D[0] = Yo[3] - last[3];
575 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
576 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
577 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
579 for(j = 0; j < 4; j++){
580 for(i = 0; i < 4; i++){
589 static inline void tm2_update_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
593 TM2_INIT_POINTERS_2();
596 for(j = 0; j < 2; j++){
597 for(i = 0; i < 2; i++){
598 U[i] = Uo[i] + GET_TOK(ctx, TM2_UPD);
599 V[i] = Vo[i] + GET_TOK(ctx, TM2_UPD);
601 U += Ustride; V += Vstride;
602 Uo += oUstride; Vo += oVstride;
606 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
607 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
610 ctx->D[0] = Yo[3] - last[3];
611 ctx->D[1] = Yo[3 + oYstride] - Yo[3];
612 ctx->D[2] = Yo[3 + oYstride * 2] - Yo[3 + oYstride];
613 ctx->D[3] = Yo[3 + oYstride * 3] - Yo[3 + oYstride * 2];
615 for(j = 0; j < 4; j++){
617 for(i = 0; i < 4; i++){
618 Y[i] = Yo[i] + GET_TOK(ctx, TM2_UPD);
621 ctx->D[j] = last[3] - d;
627 static inline void tm2_motion_block(TM2Context *ctx, AVFrame *pic, int bx, int by)
631 TM2_INIT_POINTERS_2();
633 mx = GET_TOK(ctx, TM2_MOT);
634 my = GET_TOK(ctx, TM2_MOT);
636 Yo += my * oYstride + mx;
637 Uo += (my >> 1) * oUstride + (mx >> 1);
638 Vo += (my >> 1) * oVstride + (mx >> 1);
641 for(j = 0; j < 2; j++){
642 for(i = 0; i < 2; i++){
646 U += Ustride; V += Vstride;
647 Uo += oUstride; Vo += oVstride;
651 TM2_RECALC_BLOCK(U, Ustride, clast, ctx->CD);
652 TM2_RECALC_BLOCK(V, Vstride, (clast + 2), (ctx->CD + 2));
655 for(j = 0; j < 4; j++){
656 for(i = 0; i < 4; i++){
662 /* calculate deltas */
664 ctx->D[0] = Y[3] - last[3];
665 ctx->D[1] = Y[3 + Ystride] - Y[3];
666 ctx->D[2] = Y[3 + Ystride * 2] - Y[3 + Ystride];
667 ctx->D[3] = Y[3 + Ystride * 3] - Y[3 + Ystride * 2];
668 for(i = 0; i < 4; i++)
669 last[i] = Y[i + Ystride * 3];
672 static int tm2_decode_blocks(TM2Context *ctx, AVFrame *p)
681 bw = ctx->avctx->width >> 2;
682 bh = ctx->avctx->height >> 2;
684 for(i = 0; i < TM2_NUM_STREAMS; i++)
685 ctx->tok_ptrs[i] = 0;
687 if (ctx->tok_lens[TM2_TYPE]<bw*bh){
688 av_log(ctx->avctx,AV_LOG_ERROR,"Got %i tokens for %i blocks\n",ctx->tok_lens[TM2_TYPE],bw*bh);
692 memset(ctx->last, 0, 4 * bw * sizeof(int));
693 memset(ctx->clast, 0, 4 * bw * sizeof(int));
695 for(j = 0; j < bh; j++) {
696 memset(ctx->D, 0, 4 * sizeof(int));
697 memset(ctx->CD, 0, 4 * sizeof(int));
698 for(i = 0; i < bw; i++) {
699 type = GET_TOK(ctx, TM2_TYPE);
702 tm2_hi_res_block(ctx, p, i, j);
705 tm2_med_res_block(ctx, p, i, j);
708 tm2_low_res_block(ctx, p, i, j);
711 tm2_null_res_block(ctx, p, i, j);
714 tm2_update_block(ctx, p, i, j);
718 tm2_still_block(ctx, p, i, j);
722 tm2_motion_block(ctx, p, i, j);
726 av_log(ctx->avctx, AV_LOG_ERROR, "Skipping unknown block type %i\n", type);
731 /* copy data from our buffer to AVFrame */
733 src = (ctx->cur?ctx->Y2:ctx->Y1);
734 for(j = 0; j < ctx->avctx->height; j++){
735 for(i = 0; i < ctx->avctx->width; i++){
736 Y[i] = av_clip_uint8(*src++);
741 src = (ctx->cur?ctx->U2:ctx->U1);
742 for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
743 for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
744 U[i] = av_clip_uint8(*src++);
749 src = (ctx->cur?ctx->V2:ctx->V1);
750 for(j = 0; j < (ctx->avctx->height + 1) >> 1; j++){
751 for(i = 0; i < (ctx->avctx->width + 1) >> 1; i++){
752 V[i] = av_clip_uint8(*src++);
760 static const int tm2_stream_order[TM2_NUM_STREAMS] = {
761 TM2_C_HI, TM2_C_LO, TM2_L_HI, TM2_L_LO, TM2_UPD, TM2_MOT, TM2_TYPE
764 static int decode_frame(AVCodecContext *avctx,
765 void *data, int *data_size,
766 const uint8_t *buf, int buf_size)
768 TM2Context * const l = avctx->priv_data;
769 AVFrame * const p= (AVFrame*)&l->pic;
773 swbuf = av_malloc(buf_size + FF_INPUT_BUFFER_PADDING_SIZE);
775 av_log(avctx, AV_LOG_ERROR, "Cannot allocate temporary buffer\n");
779 p->buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
780 if(avctx->reget_buffer(avctx, p) < 0){
781 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
786 l->dsp.bswap_buf((uint32_t*)swbuf, (const uint32_t*)buf, buf_size >> 2);
787 skip = tm2_read_header(l, swbuf);
794 for(i = 0; i < TM2_NUM_STREAMS; i++){
795 t = tm2_read_stream(l, swbuf + skip, tm2_stream_order[i]);
802 p->key_frame = tm2_decode_blocks(l, p);
804 p->pict_type = FF_I_TYPE;
806 p->pict_type = FF_P_TYPE;
809 *data_size = sizeof(AVFrame);
810 *(AVFrame*)data = l->pic;
816 static av_cold int decode_init(AVCodecContext *avctx){
817 TM2Context * const l = avctx->priv_data;
820 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
823 if((avctx->width & 3) || (avctx->height & 3)){
824 av_log(avctx, AV_LOG_ERROR, "Width and height must be multiple of 4\n");
830 avctx->pix_fmt = PIX_FMT_YUV420P;
832 dsputil_init(&l->dsp, avctx);
834 l->last = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
835 l->clast = av_malloc(4 * sizeof(int) * (avctx->width >> 2));
837 for(i = 0; i < TM2_NUM_STREAMS; i++) {
842 l->Y1 = av_malloc(sizeof(int) * avctx->width * avctx->height);
843 l->U1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
844 l->V1 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
845 l->Y2 = av_malloc(sizeof(int) * avctx->width * avctx->height);
846 l->U2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
847 l->V2 = av_malloc(sizeof(int) * ((avctx->width + 1) >> 1) * ((avctx->height + 1) >> 1));
853 static av_cold int decode_end(AVCodecContext *avctx){
854 TM2Context * const l = avctx->priv_data;
861 for(i = 0; i < TM2_NUM_STREAMS; i++)
863 av_free(l->tokens[i]);
875 AVCodec truemotion2_decoder = {
878 CODEC_ID_TRUEMOTION2,
885 .long_name = NULL_IF_CONFIG_SMALL("Duck TrueMotion 2.0"),