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
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 "get_bits.h"
38#include "bytestream.h"
39
40#define SMKTREE_BITS 9
41#define SMK_NODE 0x80000000
42
43/*
44 * Decoder context
45 */
46typedef 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 */
57typedef 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 */
67typedef 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 */
76static 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
86enum 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 */
95static 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 */
127static 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 */
172static 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
275static 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
322static 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 */
327static 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
348static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
349{
350    const uint8_t *buf = avpkt->data;
351    int buf_size = avpkt->size;
352    SmackVContext * const smk = avctx->priv_data;
353    uint8_t *out;
354    uint32_t *pal;
355    GetBitContext gb;
356    int blocks, blk, bw, bh;
357    int i;
358    int stride;
359
360    if(buf_size <= 769)
361        return 0;
362    if(smk->pic.data[0])
363            avctx->release_buffer(avctx, &smk->pic);
364
365    smk->pic.reference = 1;
366    smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
367    if(avctx->reget_buffer(avctx, &smk->pic) < 0){
368        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
369        return -1;
370    }
371
372    /* make the palette available on the way out */
373    pal = (uint32_t*)smk->pic.data[1];
374    smk->pic.palette_has_changed = buf[0] & 1;
375    smk->pic.key_frame = !!(buf[0] & 2);
376    if(smk->pic.key_frame)
377        smk->pic.pict_type = FF_I_TYPE;
378    else
379        smk->pic.pict_type = FF_P_TYPE;
380
381    buf++;
382    for(i = 0; i < 256; i++)
383        *pal++ = bytestream_get_be24(&buf);
384    buf_size -= 769;
385
386    last_reset(smk->mmap_tbl, smk->mmap_last);
387    last_reset(smk->mclr_tbl, smk->mclr_last);
388    last_reset(smk->full_tbl, smk->full_last);
389    last_reset(smk->type_tbl, smk->type_last);
390    init_get_bits(&gb, buf, buf_size * 8);
391
392    blk = 0;
393    bw = avctx->width >> 2;
394    bh = avctx->height >> 2;
395    blocks = bw * bh;
396    out = smk->pic.data[0];
397    stride = smk->pic.linesize[0];
398    while(blk < blocks) {
399        int type, run, mode;
400        uint16_t pix;
401
402        type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
403        run = block_runs[(type >> 2) & 0x3F];
404        switch(type & 3){
405        case SMK_BLK_MONO:
406            while(run-- && blk < blocks){
407                int clr, map;
408                int hi, lo;
409                clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
410                map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
411                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
412                hi = clr >> 8;
413                lo = clr & 0xFF;
414                for(i = 0; i < 4; i++) {
415                    if(map & 1) out[0] = hi; else out[0] = lo;
416                    if(map & 2) out[1] = hi; else out[1] = lo;
417                    if(map & 4) out[2] = hi; else out[2] = lo;
418                    if(map & 8) out[3] = hi; else out[3] = lo;
419                    map >>= 4;
420                    out += stride;
421                }
422                blk++;
423            }
424            break;
425        case SMK_BLK_FULL:
426            mode = 0;
427            if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
428                if(get_bits1(&gb)) mode = 1;
429                else if(get_bits1(&gb)) mode = 2;
430            }
431            while(run-- && blk < blocks){
432                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
433                switch(mode){
434                case 0:
435                    for(i = 0; i < 4; i++) {
436                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
437                        AV_WL16(out+2,pix);
438                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
439                        AV_WL16(out,pix);
440                        out += stride;
441                    }
442                    break;
443                case 1:
444                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
445                    out[0] = out[1] = pix & 0xFF;
446                    out[2] = out[3] = pix >> 8;
447                    out += stride;
448                    out[0] = out[1] = pix & 0xFF;
449                    out[2] = out[3] = pix >> 8;
450                    out += stride;
451                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
452                    out[0] = out[1] = pix & 0xFF;
453                    out[2] = out[3] = pix >> 8;
454                    out += stride;
455                    out[0] = out[1] = pix & 0xFF;
456                    out[2] = out[3] = pix >> 8;
457                    out += stride;
458                    break;
459                case 2:
460                    for(i = 0; i < 2; i++) {
461                        uint16_t pix1, pix2;
462                        pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
463                        pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
464                        AV_WL16(out,pix1);
465                        AV_WL16(out+2,pix2);
466                        out += stride;
467                        AV_WL16(out,pix1);
468                        AV_WL16(out+2,pix2);
469                        out += stride;
470                    }
471                    break;
472                }
473                blk++;
474            }
475            break;
476        case SMK_BLK_SKIP:
477            while(run-- && blk < blocks)
478                blk++;
479            break;
480        case SMK_BLK_FILL:
481            mode = type >> 8;
482            while(run-- && blk < blocks){
483                uint32_t col;
484                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
485                col = mode * 0x01010101;
486                for(i = 0; i < 4; i++) {
487                    *((uint32_t*)out) = col;
488                    out += stride;
489                }
490                blk++;
491            }
492            break;
493        }
494
495    }
496
497    *data_size = sizeof(AVFrame);
498    *(AVFrame*)data = smk->pic;
499
500    /* always report that the buffer was completely consumed */
501    return buf_size;
502}
503
504
505
506/*
507 *
508 * Init smacker decoder
509 *
510 */
511static av_cold int decode_init(AVCodecContext *avctx)
512{
513    SmackVContext * const c = avctx->priv_data;
514
515    c->avctx = avctx;
516
517    avctx->pix_fmt = PIX_FMT_PAL8;
518
519
520    /* decode huffman trees from extradata */
521    if(avctx->extradata_size < 16){
522        av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
523        return -1;
524    }
525
526    decode_header_trees(c);
527
528
529    return 0;
530}
531
532
533
534/*
535 *
536 * Uninit smacker decoder
537 *
538 */
539static av_cold int decode_end(AVCodecContext *avctx)
540{
541    SmackVContext * const smk = avctx->priv_data;
542
543    av_freep(&smk->mmap_tbl);
544    av_freep(&smk->mclr_tbl);
545    av_freep(&smk->full_tbl);
546    av_freep(&smk->type_tbl);
547
548    if (smk->pic.data[0])
549        avctx->release_buffer(avctx, &smk->pic);
550
551    return 0;
552}
553
554
555static av_cold int smka_decode_init(AVCodecContext *avctx)
556{
557    avctx->channel_layout = (avctx->channels==2) ? CH_LAYOUT_STEREO : CH_LAYOUT_MONO;
558    avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? SAMPLE_FMT_U8 : SAMPLE_FMT_S16;
559    return 0;
560}
561
562/**
563 * Decode Smacker audio data
564 */
565static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, AVPacket *avpkt)
566{
567    const uint8_t *buf = avpkt->data;
568    int buf_size = avpkt->size;
569    GetBitContext gb;
570    HuffContext h[4];
571    VLC vlc[4];
572    int16_t *samples = data;
573    int8_t *samples8 = data;
574    int val;
575    int i, res;
576    int unp_size;
577    int bits, stereo;
578    int pred[2] = {0, 0};
579
580    unp_size = AV_RL32(buf);
581
582    init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
583
584    if(!get_bits1(&gb)){
585        av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
586        *data_size = 0;
587        return 1;
588    }
589    stereo = get_bits1(&gb);
590    bits = get_bits1(&gb);
591    if (unp_size & 0xC0000000 || unp_size > *data_size) {
592        av_log(avctx, AV_LOG_ERROR, "Frame is too large to fit in buffer\n");
593        return -1;
594    }
595
596    memset(vlc, 0, sizeof(VLC) * 4);
597    memset(h, 0, sizeof(HuffContext) * 4);
598    // Initialize
599    for(i = 0; i < (1 << (bits + stereo)); i++) {
600        h[i].length = 256;
601        h[i].maxlength = 0;
602        h[i].current = 0;
603        h[i].bits = av_mallocz(256 * 4);
604        h[i].lengths = av_mallocz(256 * sizeof(int));
605        h[i].values = av_mallocz(256 * sizeof(int));
606        skip_bits1(&gb);
607        smacker_decode_tree(&gb, &h[i], 0, 0);
608        skip_bits1(&gb);
609        if(h[i].current > 1) {
610            res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
611                    h[i].lengths, sizeof(int), sizeof(int),
612                    h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
613            if(res < 0) {
614                av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
615                return -1;
616            }
617        }
618    }
619    if(bits) { //decode 16-bit data
620        for(i = stereo; i >= 0; i--)
621            pred[i] = bswap_16(get_bits(&gb, 16));
622        for(i = 0; i < stereo; i++)
623            *samples++ = pred[i];
624        for(i = 0; i < unp_size / 2; i++) {
625            if(i & stereo) {
626                if(vlc[2].table)
627                    res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
628                else
629                    res = 0;
630                val  = h[2].values[res];
631                if(vlc[3].table)
632                    res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
633                else
634                    res = 0;
635                val |= h[3].values[res] << 8;
636                pred[1] += (int16_t)val;
637                *samples++ = pred[1];
638            } else {
639                if(vlc[0].table)
640                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
641                else
642                    res = 0;
643                val  = h[0].values[res];
644                if(vlc[1].table)
645                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
646                else
647                    res = 0;
648                val |= h[1].values[res] << 8;
649                pred[0] += val;
650                *samples++ = pred[0];
651            }
652        }
653    } else { //8-bit data
654        for(i = stereo; i >= 0; i--)
655            pred[i] = get_bits(&gb, 8);
656        for(i = 0; i < stereo; i++)
657            *samples8++ = pred[i];
658        for(i = 0; i < unp_size; i++) {
659            if(i & stereo){
660                if(vlc[1].table)
661                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
662                else
663                    res = 0;
664                pred[1] += (int8_t)h[1].values[res];
665                *samples8++ = pred[1];
666            } else {
667                if(vlc[0].table)
668                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
669                else
670                    res = 0;
671                pred[0] += (int8_t)h[0].values[res];
672                *samples8++ = pred[0];
673            }
674        }
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
692AVCodec smacker_decoder = {
693    "smackvid",
694    AVMEDIA_TYPE_VIDEO,
695    CODEC_ID_SMACKVIDEO,
696    sizeof(SmackVContext),
697    decode_init,
698    NULL,
699    decode_end,
700    decode_frame,
701    CODEC_CAP_DR1,
702    .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
703};
704
705AVCodec smackaud_decoder = {
706    "smackaud",
707    AVMEDIA_TYPE_AUDIO,
708    CODEC_ID_SMACKAUDIO,
709    0,
710    smka_decode_init,
711    NULL,
712    NULL,
713    smka_decode_frame,
714    .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
715};
716
717