100l, since we already check for buf_size == 769 we should also
[libav.git] / libavcodec / smacker.c
1 /*
2 * Smacker decoder
3 * Copyright (c) 2006 Konstantin Shishkov
4 *
5 * This file is part of FFmpeg.
6 *
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.
11 *
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.
16 *
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
20 */
21
22 /**
23 * @file smacker.c
24 * Smacker decoder
25 */
26
27 /*
28 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
29 */
30
31 #include <stdio.h>
32 #include <stdlib.h>
33
34 #include "avcodec.h"
35
36 #define ALT_BITSTREAM_READER_LE
37 #include "bitstream.h"
38 #include "bytestream.h"
39
40 #define SMKTREE_BITS 9
41 #define SMK_NODE 0x80000000
42
43 /*
44 * Decoder context
45 */
46 typedef struct SmackVContext {
47 AVCodecContext *avctx;
48 AVFrame pic;
49
50 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
51 int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
52 } SmackVContext;
53
54 /**
55 * Context used for code reconstructing
56 */
57 typedef struct HuffContext {
58 int length;
59 int maxlength;
60 int current;
61 uint32_t *bits;
62 int *lengths;
63 int *values;
64 } HuffContext;
65
66 /* common parameters used for decode_bigtree */
67 typedef struct DBCtx {
68 VLC *v1, *v2;
69 int *recode1, *recode2;
70 int escapes[3];
71 int *last;
72 int lcur;
73 } DBCtx;
74
75 /* possible runs of blocks */
76 static const int block_runs[64] = {
77 1, 2, 3, 4, 5, 6, 7, 8,
78 9, 10, 11, 12, 13, 14, 15, 16,
79 17, 18, 19, 20, 21, 22, 23, 24,
80 25, 26, 27, 28, 29, 30, 31, 32,
81 33, 34, 35, 36, 37, 38, 39, 40,
82 41, 42, 43, 44, 45, 46, 47, 48,
83 49, 50, 51, 52, 53, 54, 55, 56,
84 57, 58, 59, 128, 256, 512, 1024, 2048 };
85
86 enum SmkBlockTypes {
87 SMK_BLK_MONO = 0,
88 SMK_BLK_FULL = 1,
89 SMK_BLK_SKIP = 2,
90 SMK_BLK_FILL = 3 };
91
92 /**
93 * Decode local frame tree
94 */
95 static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
96 {
97 if(!get_bits1(gb)){ //Leaf
98 if(hc->current >= 256){
99 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
100 return -1;
101 }
102 if(length){
103 hc->bits[hc->current] = prefix;
104 hc->lengths[hc->current] = length;
105 } else {
106 hc->bits[hc->current] = 0;
107 hc->lengths[hc->current] = 0;
108 }
109 hc->values[hc->current] = get_bits(gb, 8);
110 hc->current++;
111 if(hc->maxlength < length)
112 hc->maxlength = length;
113 return 0;
114 } else { //Node
115 int r;
116 length++;
117 r = smacker_decode_tree(gb, hc, prefix, length);
118 if(r)
119 return r;
120 return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
121 }
122 }
123
124 /**
125 * Decode header tree
126 */
127 static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
128 {
129 if(!get_bits1(gb)){ //Leaf
130 int val, i1, i2, b1, b2;
131 if(hc->current >= hc->length){
132 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
133 return -1;
134 }
135 b1 = get_bits_count(gb);
136 i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3);
137 b1 = get_bits_count(gb) - b1;
138 b2 = get_bits_count(gb);
139 i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3);
140 b2 = get_bits_count(gb) - b2;
141 val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
142 if(val == ctx->escapes[0]) {
143 ctx->last[0] = hc->current;
144 val = 0;
145 } else if(val == ctx->escapes[1]) {
146 ctx->last[1] = hc->current;
147 val = 0;
148 } else if(val == ctx->escapes[2]) {
149 ctx->last[2] = hc->current;
150 val = 0;
151 }
152
153 hc->values[hc->current++] = val;
154 return 1;
155 } else { //Node
156 int r = 0, t;
157
158 t = hc->current++;
159 r = smacker_decode_bigtree(gb, hc, ctx);
160 if(r < 0)
161 return r;
162 hc->values[t] = SMK_NODE | r;
163 r++;
164 r += smacker_decode_bigtree(gb, hc, ctx);
165 return r;
166 }
167 }
168
169 /**
170 * Store large tree as FFmpeg's vlc codes
171 */
172 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
173 {
174 int res;
175 HuffContext huff;
176 HuffContext tmp1, tmp2;
177 VLC vlc[2];
178 int escapes[3];
179 DBCtx ctx;
180
181 if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
182 av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
183 return -1;
184 }
185
186 tmp1.length = 256;
187 tmp1.maxlength = 0;
188 tmp1.current = 0;
189 tmp1.bits = av_mallocz(256 * 4);
190 tmp1.lengths = av_mallocz(256 * sizeof(int));
191 tmp1.values = av_mallocz(256 * sizeof(int));
192
193 tmp2.length = 256;
194 tmp2.maxlength = 0;
195 tmp2.current = 0;
196 tmp2.bits = av_mallocz(256 * 4);
197 tmp2.lengths = av_mallocz(256 * sizeof(int));
198 tmp2.values = av_mallocz(256 * sizeof(int));
199
200 memset(&vlc[0], 0, sizeof(VLC));
201 memset(&vlc[1], 0, sizeof(VLC));
202
203 if(get_bits1(gb)) {
204 smacker_decode_tree(gb, &tmp1, 0, 0);
205 skip_bits1(gb);
206 res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
207 tmp1.lengths, sizeof(int), sizeof(int),
208 tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
209 if(res < 0) {
210 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
211 return -1;
212 }
213 } else {
214 av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
215 }
216 if(get_bits1(gb)){
217 smacker_decode_tree(gb, &tmp2, 0, 0);
218 skip_bits1(gb);
219 res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
220 tmp2.lengths, sizeof(int), sizeof(int),
221 tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
222 if(res < 0) {
223 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
224 return -1;
225 }
226 } else {
227 av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
228 }
229
230 escapes[0] = get_bits(gb, 8);
231 escapes[0] |= get_bits(gb, 8) << 8;
232 escapes[1] = get_bits(gb, 8);
233 escapes[1] |= get_bits(gb, 8) << 8;
234 escapes[2] = get_bits(gb, 8);
235 escapes[2] |= get_bits(gb, 8) << 8;
236
237 last[0] = last[1] = last[2] = -1;
238
239 ctx.escapes[0] = escapes[0];
240 ctx.escapes[1] = escapes[1];
241 ctx.escapes[2] = escapes[2];
242 ctx.v1 = &vlc[0];
243 ctx.v2 = &vlc[1];
244 ctx.recode1 = tmp1.values;
245 ctx.recode2 = tmp2.values;
246 ctx.last = last;
247
248 huff.length = ((size + 3) >> 2) + 3;
249 huff.maxlength = 0;
250 huff.current = 0;
251 huff.values = av_mallocz(huff.length * sizeof(int));
252
253 smacker_decode_bigtree(gb, &huff, &ctx);
254 skip_bits1(gb);
255 if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
256 if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
257 if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
258
259 *recodes = huff.values;
260
261 if(vlc[0].table)
262 free_vlc(&vlc[0]);
263 if(vlc[1].table)
264 free_vlc(&vlc[1]);
265 av_free(tmp1.bits);
266 av_free(tmp1.lengths);
267 av_free(tmp1.values);
268 av_free(tmp2.bits);
269 av_free(tmp2.lengths);
270 av_free(tmp2.values);
271
272 return 0;
273 }
274
275 static int decode_header_trees(SmackVContext *smk) {
276 GetBitContext gb;
277 int mmap_size, mclr_size, full_size, type_size;
278
279 mmap_size = AV_RL32(smk->avctx->extradata);
280 mclr_size = AV_RL32(smk->avctx->extradata + 4);
281 full_size = AV_RL32(smk->avctx->extradata + 8);
282 type_size = AV_RL32(smk->avctx->extradata + 12);
283
284 init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
285
286 if(!get_bits1(&gb)) {
287 av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
288 smk->mmap_tbl = av_malloc(sizeof(int) * 2);
289 smk->mmap_tbl[0] = 0;
290 smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
291 } else {
292 smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
293 }
294 if(!get_bits1(&gb)) {
295 av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
296 smk->mclr_tbl = av_malloc(sizeof(int) * 2);
297 smk->mclr_tbl[0] = 0;
298 smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
299 } else {
300 smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
301 }
302 if(!get_bits1(&gb)) {
303 av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
304 smk->full_tbl = av_malloc(sizeof(int) * 2);
305 smk->full_tbl[0] = 0;
306 smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
307 } else {
308 smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
309 }
310 if(!get_bits1(&gb)) {
311 av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
312 smk->type_tbl = av_malloc(sizeof(int) * 2);
313 smk->type_tbl[0] = 0;
314 smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
315 } else {
316 smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
317 }
318
319 return 0;
320 }
321
322 static av_always_inline void last_reset(int *recode, int *last) {
323 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
324 }
325
326 /* get code and update history */
327 static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
328 register int *table = recode;
329 int v, b;
330
331 b = get_bits_count(gb);
332 while(*table & SMK_NODE) {
333 if(get_bits1(gb))
334 table += (*table) & (~SMK_NODE);
335 table++;
336 }
337 v = *table;
338 b = get_bits_count(gb) - b;
339
340 if(v != recode[last[0]]) {
341 recode[last[2]] = recode[last[1]];
342 recode[last[1]] = recode[last[0]];
343 recode[last[0]] = v;
344 }
345 return v;
346 }
347
348 static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
349 {
350 SmackVContext * const smk = avctx->priv_data;
351 uint8_t *out;
352 uint32_t *pal;
353 GetBitContext gb;
354 int blocks, blk, bw, bh;
355 int i;
356 int stride;
357
358 if(buf_size <= 769)
359 return 0;
360 if(smk->pic.data[0])
361 avctx->release_buffer(avctx, &smk->pic);
362
363 smk->pic.reference = 1;
364 smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
365 if(avctx->reget_buffer(avctx, &smk->pic) < 0){
366 av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
367 return -1;
368 }
369
370 /* make the palette available on the way out */
371 pal = (uint32_t*)smk->pic.data[1];
372 smk->pic.palette_has_changed = buf[0] & 1;
373 smk->pic.key_frame = !!(buf[0] & 2);
374 if(smk->pic.key_frame)
375 smk->pic.pict_type = FF_I_TYPE;
376 else
377 smk->pic.pict_type = FF_P_TYPE;
378
379 buf++;
380 for(i = 0; i < 256; i++)
381 *pal++ = bytestream_get_be24(&buf);
382 buf_size -= 769;
383
384 last_reset(smk->mmap_tbl, smk->mmap_last);
385 last_reset(smk->mclr_tbl, smk->mclr_last);
386 last_reset(smk->full_tbl, smk->full_last);
387 last_reset(smk->type_tbl, smk->type_last);
388 init_get_bits(&gb, buf, buf_size * 8);
389
390 blk = 0;
391 bw = avctx->width >> 2;
392 bh = avctx->height >> 2;
393 blocks = bw * bh;
394 out = smk->pic.data[0];
395 stride = smk->pic.linesize[0];
396 while(blk < blocks) {
397 int type, run, mode;
398 uint16_t pix;
399
400 type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
401 run = block_runs[(type >> 2) & 0x3F];
402 switch(type & 3){
403 case SMK_BLK_MONO:
404 while(run-- && blk < blocks){
405 int clr, map;
406 int hi, lo;
407 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
408 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
409 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
410 hi = clr >> 8;
411 lo = clr & 0xFF;
412 for(i = 0; i < 4; i++) {
413 if(map & 1) out[0] = hi; else out[0] = lo;
414 if(map & 2) out[1] = hi; else out[1] = lo;
415 if(map & 4) out[2] = hi; else out[2] = lo;
416 if(map & 8) out[3] = hi; else out[3] = lo;
417 map >>= 4;
418 out += stride;
419 }
420 blk++;
421 }
422 break;
423 case SMK_BLK_FULL:
424 mode = 0;
425 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
426 if(get_bits1(&gb)) mode = 1;
427 else if(get_bits1(&gb)) mode = 2;
428 }
429 while(run-- && blk < blocks){
430 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
431 switch(mode){
432 case 0:
433 for(i = 0; i < 4; i++) {
434 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
435 AV_WL16(out+2,pix);
436 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
437 AV_WL16(out,pix);
438 out += stride;
439 }
440 break;
441 case 1:
442 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
443 out[0] = out[1] = pix & 0xFF;
444 out[2] = out[3] = pix >> 8;
445 out += stride;
446 out[0] = out[1] = pix & 0xFF;
447 out[2] = out[3] = pix >> 8;
448 out += stride;
449 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
450 out[0] = out[1] = pix & 0xFF;
451 out[2] = out[3] = pix >> 8;
452 out += stride;
453 out[0] = out[1] = pix & 0xFF;
454 out[2] = out[3] = pix >> 8;
455 out += stride;
456 break;
457 case 2:
458 for(i = 0; i < 2; i++) {
459 uint16_t pix1, pix2;
460 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
461 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
462 AV_WL16(out,pix1);
463 AV_WL16(out+2,pix2);
464 out += stride;
465 AV_WL16(out,pix1);
466 AV_WL16(out+2,pix2);
467 out += stride;
468 }
469 break;
470 }
471 blk++;
472 }
473 break;
474 case SMK_BLK_SKIP:
475 while(run-- && blk < blocks)
476 blk++;
477 break;
478 case SMK_BLK_FILL:
479 mode = type >> 8;
480 while(run-- && blk < blocks){
481 uint32_t col;
482 out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
483 col = mode * 0x01010101;
484 for(i = 0; i < 4; i++) {
485 *((uint32_t*)out) = col;
486 out += stride;
487 }
488 blk++;
489 }
490 break;
491 }
492
493 }
494
495 *data_size = sizeof(AVFrame);
496 *(AVFrame*)data = smk->pic;
497
498 /* always report that the buffer was completely consumed */
499 return buf_size;
500 }
501
502
503
504 /*
505 *
506 * Init smacker decoder
507 *
508 */
509 static int decode_init(AVCodecContext *avctx)
510 {
511 SmackVContext * const c = avctx->priv_data;
512
513 c->avctx = avctx;
514
515 c->pic.data[0] = NULL;
516
517 if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 0) {
518 return 1;
519 }
520
521 avctx->pix_fmt = PIX_FMT_PAL8;
522
523
524 /* decode huffman trees from extradata */
525 if(avctx->extradata_size < 16){
526 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
527 return -1;
528 }
529
530 decode_header_trees(c);
531
532
533 return 0;
534 }
535
536
537
538 /*
539 *
540 * Uninit smacker decoder
541 *
542 */
543 static int decode_end(AVCodecContext *avctx)
544 {
545 SmackVContext * const smk = avctx->priv_data;
546
547 av_freep(&smk->mmap_tbl);
548 av_freep(&smk->mclr_tbl);
549 av_freep(&smk->full_tbl);
550 av_freep(&smk->type_tbl);
551
552 if (smk->pic.data[0])
553 avctx->release_buffer(avctx, &smk->pic);
554
555 return 0;
556 }
557
558
559 static int smka_decode_init(AVCodecContext *avctx)
560 {
561 return 0;
562 }
563
564 /**
565 * Decode Smacker audio data
566 */
567 static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, const uint8_t *buf, int buf_size)
568 {
569 GetBitContext gb;
570 HuffContext h[4];
571 VLC vlc[4];
572 int16_t *samples = data;
573 int val;
574 int i, res;
575 int unp_size;
576 int bits, stereo;
577 int pred[2] = {0, 0};
578
579 unp_size = AV_RL32(buf);
580
581 init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
582
583 if(!get_bits1(&gb)){
584 av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
585 *data_size = 0;
586 return 1;
587 }
588 stereo = get_bits1(&gb);
589 bits = get_bits1(&gb);
590 if (unp_size & 0xC0000000 || (unp_size << !bits) > *data_size) {
591 av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n");
592 return -1;
593 }
594
595 memset(vlc, 0, sizeof(VLC) * 4);
596 memset(h, 0, sizeof(HuffContext) * 4);
597 // Initialize
598 for(i = 0; i < (1 << (bits + stereo)); i++) {
599 h[i].length = 256;
600 h[i].maxlength = 0;
601 h[i].current = 0;
602 h[i].bits = av_mallocz(256 * 4);
603 h[i].lengths = av_mallocz(256 * sizeof(int));
604 h[i].values = av_mallocz(256 * sizeof(int));
605 skip_bits1(&gb);
606 smacker_decode_tree(&gb, &h[i], 0, 0);
607 skip_bits1(&gb);
608 if(h[i].current > 1) {
609 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
610 h[i].lengths, sizeof(int), sizeof(int),
611 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
612 if(res < 0) {
613 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
614 return -1;
615 }
616 }
617 }
618 if(bits) { //decode 16-bit data
619 for(i = stereo; i >= 0; i--)
620 pred[i] = bswap_16(get_bits(&gb, 16));
621 for(i = 0; i < stereo; i++)
622 *samples++ = pred[i];
623 for(i = 0; i < unp_size / 2; i++) {
624 if(i & stereo) {
625 if(vlc[2].table)
626 res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
627 else
628 res = 0;
629 val = h[2].values[res];
630 if(vlc[3].table)
631 res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
632 else
633 res = 0;
634 val |= h[3].values[res] << 8;
635 pred[1] += (int16_t)val;
636 *samples++ = pred[1];
637 } else {
638 if(vlc[0].table)
639 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
640 else
641 res = 0;
642 val = h[0].values[res];
643 if(vlc[1].table)
644 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
645 else
646 res = 0;
647 val |= h[1].values[res] << 8;
648 pred[0] += val;
649 *samples++ = pred[0];
650 }
651 }
652 } else { //8-bit data
653 for(i = stereo; i >= 0; i--)
654 pred[i] = get_bits(&gb, 8);
655 for(i = 0; i < stereo; i++)
656 *samples++ = (pred[i] - 0x80) << 8;
657 for(i = 0; i < unp_size; i++) {
658 if(i & stereo){
659 if(vlc[1].table)
660 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
661 else
662 res = 0;
663 pred[1] += (int8_t)h[1].values[res];
664 *samples++ = (pred[1] - 0x80) << 8;
665 } else {
666 if(vlc[0].table)
667 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
668 else
669 res = 0;
670 pred[0] += (int8_t)h[0].values[res];
671 *samples++ = (pred[0] - 0x80) << 8;
672 }
673 }
674 unp_size *= 2;
675 }
676
677 for(i = 0; i < 4; i++) {
678 if(vlc[i].table)
679 free_vlc(&vlc[i]);
680 if(h[i].bits)
681 av_free(h[i].bits);
682 if(h[i].lengths)
683 av_free(h[i].lengths);
684 if(h[i].values)
685 av_free(h[i].values);
686 }
687
688 *data_size = unp_size;
689 return buf_size;
690 }
691
692 AVCodec smacker_decoder = {
693 "smackvid",
694 CODEC_TYPE_VIDEO,
695 CODEC_ID_SMACKVIDEO,
696 sizeof(SmackVContext),
697 decode_init,
698 NULL,
699 decode_end,
700 decode_frame
701 };
702
703 AVCodec smackaud_decoder = {
704 "smackaud",
705 CODEC_TYPE_AUDIO,
706 CODEC_ID_SMACKAUDIO,
707 0,
708 smka_decode_init,
709 NULL,
710 NULL,
711 smka_decode_frame
712 };
713