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1 348efc18 Kostya Shishkov
/*
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 * Smacker decoder
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 * Copyright (c) 2006 Konstantin Shishkov
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 *
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 * This library is free software; you can redistribute it and/or
6
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2 of the License, or (at your option) any later version.
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 *
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 * This library is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
13
 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with this library; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 *
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 */
20
21
/**
22
 * @file smacker.c
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 * Smacker decoder
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 */
25
26
/*
27
 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
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 */
29
30
#include <stdio.h>
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#include <stdlib.h>
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33
#include "common.h"
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#include "avcodec.h"
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36
#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
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39
#define SMKTREE_BITS 9
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#define SMK_NODE 0x80000000
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42
/*
43
 * Decoder context
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 */
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typedef struct SmackVContext {
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    AVCodecContext *avctx;
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    AVFrame pic;
48
49
    int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
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    int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
51
} SmackVContext;
52
53
/**
54
 * Context used for code reconstructing
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 */
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typedef struct HuffContext {
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    int length;
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    int maxlength;
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    int current;
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    uint32_t *bits;
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    int *lengths;
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    int *values;
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} HuffContext;
64
65
/* common parameters used for decode_bigtree */
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typedef struct DBCtx {
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    VLC *v1, *v2;
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    int *recode1, *recode2;
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    int escapes[3];
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    int *last;
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    int lcur;
72
} DBCtx;
73
74
/* possible runs of blocks */
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static const int block_runs[64] = {
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      1,    2,    3,    4,    5,    6,    7,    8,
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      9,   10,   11,   12,   13,   14,   15,   16,
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     17,   18,   19,   20,   21,   22,   23,   24,
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     25,   26,   27,   28,   29,   30,   31,   32,
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     33,   34,   35,   36,   37,   38,   39,   40,
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     41,   42,   43,   44,   45,   46,   47,   48,
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     49,   50,   51,   52,   53,   54,   55,   56,
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     57,   58,   59,  128,  256,  512, 1024, 2048 };
84
85
enum SmkBlockTypes {
86
    SMK_BLK_MONO = 0,
87
    SMK_BLK_FULL = 1,
88
    SMK_BLK_SKIP = 2,
89
    SMK_BLK_FILL = 3 };
90
91
/**
92
 * Decode local frame tree
93
 */
94
static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
95
{
96
    if(!get_bits1(gb)){ //Leaf
97
        if(hc->current >= 256){
98
            av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
99
            return -1;
100
        }
101
        if(length){
102
            hc->bits[hc->current] = prefix;
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            hc->lengths[hc->current] = length;
104
        } else {
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            hc->bits[hc->current] = 0;
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            hc->lengths[hc->current] = 0;
107
        }
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        hc->values[hc->current] = get_bits(gb, 8);
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        hc->current++;
110
        if(hc->maxlength < length)
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            hc->maxlength = length;
112
        return 0;
113
    } else { //Node
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        int r;
115
        length++;
116
        r = smacker_decode_tree(gb, hc, prefix, length);
117
        if(r)
118
            return r;
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        return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
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    }
121
}
122
123
/**
124
 * Decode header tree
125
 */
126
static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
127
{
128
    if(!get_bits1(gb)){ //Leaf
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        int val, i1, i2, b1, b2;
130
        if(hc->current >= hc->length){
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            av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
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            return -1;
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        }
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        b1 = get_bits_count(gb);
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        i1 = get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3);
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        b1 = get_bits_count(gb) - b1;
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        b2 = get_bits_count(gb);
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        i2 = get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3);
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        b2 = get_bits_count(gb) - b2;
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        val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
141
        if(val == ctx->escapes[0]) {
142
            ctx->last[0] = hc->current;
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            val = 0;
144
        } else if(val == ctx->escapes[1]) {
145
            ctx->last[1] = hc->current;
146
            val = 0;
147
        } else if(val == ctx->escapes[2]) {
148
            ctx->last[2] = hc->current;
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            val = 0;
150
        }
151
152
        hc->values[hc->current++] = val;
153
        return 1;
154
    } else { //Node
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        int r = 0, t;
156
157
        t = hc->current++;
158
        r = smacker_decode_bigtree(gb, hc, ctx);
159
        if(r < 0)
160
            return r;
161
        hc->values[t] = SMK_NODE | r;
162
        r++;
163
        r += smacker_decode_bigtree(gb, hc, ctx);
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        return r;
165
    }
166
}
167
168
/**
169
 * Store large tree as FFmpeg's vlc codes
170
 */
171
static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
172
{
173
    int res;
174
    HuffContext huff;
175
    HuffContext tmp1, tmp2;
176
    VLC vlc[2];
177
    int escapes[3];
178
    DBCtx ctx;
179
180 3a1a7e32 Michael Niedermayer
    if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
181
        av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
182
        return -1;
183
    }
184
185 348efc18 Kostya Shishkov
    tmp1.length = 256;
186
    tmp1.maxlength = 0;
187
    tmp1.current = 0;
188
    tmp1.bits = av_mallocz(256 * 4);
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    tmp1.lengths = av_mallocz(256 * sizeof(int));
190
    tmp1.values = av_mallocz(256 * sizeof(int));
191
192
    tmp2.length = 256;
193
    tmp2.maxlength = 0;
194
    tmp2.current = 0;
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    tmp2.bits = av_mallocz(256 * 4);
196
    tmp2.lengths = av_mallocz(256 * sizeof(int));
197
    tmp2.values = av_mallocz(256 * sizeof(int));
198
199
    memset(&vlc[0], 0, sizeof(VLC));
200
    memset(&vlc[1], 0, sizeof(VLC));
201
202
    if(get_bits1(gb)) {
203
        smacker_decode_tree(gb, &tmp1, 0, 0);
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        get_bits1(gb);
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        res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
206
                    tmp1.lengths, sizeof(int), sizeof(int),
207
                    tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
208
        if(res < 0) {
209
            av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
210
            return -1;
211
        }
212
    } else {
213
        av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
214
    }
215
    if(get_bits1(gb)){
216
        smacker_decode_tree(gb, &tmp2, 0, 0);
217
        get_bits1(gb);
218
        res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
219
                    tmp2.lengths, sizeof(int), sizeof(int),
220
                    tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
221
        if(res < 0) {
222
            av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
223
            return -1;
224
        }
225
    } else {
226
        av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
227
    }
228
229
    escapes[0]  = get_bits(gb, 8);
230
    escapes[0] |= get_bits(gb, 8) << 8;
231
    escapes[1]  = get_bits(gb, 8);
232
    escapes[1] |= get_bits(gb, 8) << 8;
233
    escapes[2]  = get_bits(gb, 8);
234
    escapes[2] |= get_bits(gb, 8) << 8;
235
236
    last[0] = last[1] = last[2] = -1;
237
238
    ctx.escapes[0] = escapes[0];
239
    ctx.escapes[1] = escapes[1];
240
    ctx.escapes[2] = escapes[2];
241
    ctx.v1 = &vlc[0];
242
    ctx.v2 = &vlc[1];
243
    ctx.recode1 = tmp1.values;
244
    ctx.recode2 = tmp2.values;
245
    ctx.last = last;
246
247
    huff.length = ((size + 3) >> 2) + 3;
248
    huff.maxlength = 0;
249
    huff.current = 0;
250
    huff.values = av_mallocz(huff.length * sizeof(int));
251
252
    smacker_decode_bigtree(gb, &huff, &ctx);
253
    get_bits1(gb);
254
    if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
255
    if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
256
    if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
257
258
    *recodes = huff.values;
259
260
    if(vlc[0].table)
261
        free_vlc(&vlc[0]);
262
    if(vlc[1].table)
263
        free_vlc(&vlc[1]);
264
    av_free(tmp1.bits);
265
    av_free(tmp1.lengths);
266
    av_free(tmp1.values);
267
    av_free(tmp2.bits);
268
    av_free(tmp2.lengths);
269
    av_free(tmp2.values);
270
271
    return 0;
272
}
273
274
static int decode_header_trees(SmackVContext *smk) {
275
    GetBitContext gb;
276
    int mmap_size, mclr_size, full_size, type_size;
277
278
    mmap_size = LE_32(smk->avctx->extradata);
279
    mclr_size = LE_32(smk->avctx->extradata + 4);
280
    full_size = LE_32(smk->avctx->extradata + 8);
281
    type_size = LE_32(smk->avctx->extradata + 12);
282
283
    init_get_bits(&gb, smk->avctx->extradata + 16, (smk->avctx->extradata_size - 16) * 8);
284
285
    if(!get_bits1(&gb)) {
286
        av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
287
        smk->mmap_tbl = av_malloc(sizeof(int) * 2);
288
        smk->mmap_tbl[0] = 0;
289
        smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
290
    } else {
291
        smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
292
    }
293
    if(!get_bits(&gb, 1)) {
294
        av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
295
        smk->mclr_tbl = av_malloc(sizeof(int) * 2);
296
        smk->mclr_tbl[0] = 0;
297
        smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
298
    } else {
299
        smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
300
    }
301
    if(!get_bits(&gb, 1)) {
302
        av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
303
        smk->full_tbl = av_malloc(sizeof(int) * 2);
304
        smk->full_tbl[0] = 0;
305
        smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
306
    } else {
307
        smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
308
    }
309
    if(!get_bits(&gb, 1)) {
310
        av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
311
        smk->type_tbl = av_malloc(sizeof(int) * 2);
312
        smk->type_tbl[0] = 0;
313
        smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
314
    } else {
315
        smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
316
    }
317
318
    return 0;
319
}
320
321
static always_inline void last_reset(int *recode, int *last) {
322
    recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
323
}
324
325
/* get code and update history */
326
static always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
327
    register int *table = recode;
328
    int v, b;
329
330
    b = get_bits_count(gb);
331
    while(*table & SMK_NODE) {
332
        if(get_bits1(gb))
333
            table += (*table) & (~SMK_NODE);
334
        table++;
335
    }
336
    v = *table;
337
    b = get_bits_count(gb) - b;
338
339
    if(v != recode[last[0]]) {
340
        recode[last[2]] = recode[last[1]];
341
        recode[last[1]] = recode[last[0]];
342
        recode[last[0]] = v;
343
    }
344
    return v;
345
}
346
347
static int decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
348
{
349
    SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
350
    uint8_t *out;
351
    uint32_t *pal;
352
    GetBitContext gb;
353
    int blocks, blk, bw, bh;
354
    int i;
355
    int stride;
356
357
    if(buf_size == 769)
358
        return 0;
359
    if(smk->pic.data[0])
360
            avctx->release_buffer(avctx, &smk->pic);
361
362
    smk->pic.reference = 1;
363
    smk->pic.buffer_hints = FF_BUFFER_HINTS_VALID | FF_BUFFER_HINTS_PRESERVE | FF_BUFFER_HINTS_REUSABLE;
364
    if(avctx->reget_buffer(avctx, &smk->pic) < 0){
365
        av_log(avctx, AV_LOG_ERROR, "get_buffer() failed\n");
366
        return -1;
367
    }
368
369
    /* make the palette available on the way out */
370
    out = buf + 1;
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
    for(i = 0; i < 256; i++) {
380
        int r, g, b;
381
        r = *out++;
382
        g = *out++;
383
        b = *out++;
384
        *pal++ = (r << 16) | (g << 8) | b;
385
    }
386
387
    last_reset(smk->mmap_tbl, smk->mmap_last);
388
    last_reset(smk->mclr_tbl, smk->mclr_last);
389
    last_reset(smk->full_tbl, smk->full_last);
390
    last_reset(smk->type_tbl, smk->type_last);
391
    init_get_bits(&gb, buf + 769, (buf_size - 769) * 8);
392
393
    blk = 0;
394
    bw = avctx->width >> 2;
395
    bh = avctx->height >> 2;
396
    blocks = bw * bh;
397
    out = smk->pic.data[0];
398
    stride = smk->pic.linesize[0];
399
    while(blk < blocks) {
400
        int type, run, mode;
401
        uint16_t pix;
402
403
        type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
404
        run = block_runs[(type >> 2) & 0x3F];
405
        switch(type & 3){
406
        case SMK_BLK_MONO:
407
            while(run-- && blk < blocks){
408
                int clr, map;
409
                int hi, lo;
410
                clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
411
                map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
412
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
413
                hi = clr >> 8;
414
                lo = clr & 0xFF;
415
                for(i = 0; i < 4; i++) {
416
                    if(map & 1) out[0] = hi; else out[0] = lo;
417
                    if(map & 2) out[1] = hi; else out[1] = lo;
418
                    if(map & 4) out[2] = hi; else out[2] = lo;
419
                    if(map & 8) out[3] = hi; else out[3] = lo;
420
                    map >>= 4;
421
                    out += stride;
422
                }
423
                blk++;
424
            }
425
            break;
426
        case SMK_BLK_FULL:
427
            mode = 0;
428 103eee53 Kostya Shishkov
            if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
429 348efc18 Kostya Shishkov
                if(get_bits1(&gb)) mode = 1;
430
                else if(get_bits1(&gb)) mode = 2;
431
            }
432
            while(run-- && blk < blocks){
433
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
434
                switch(mode){
435
                case 0:
436
                    for(i = 0; i < 4; i++) {
437
                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
438
                        out[2] = pix & 0xFF;
439
                        out[3] = pix >> 8;
440
                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
441
                        out[0] = pix & 0xFF;
442
                        out[1] = pix >> 8;
443
                        out += stride;
444
                    }
445
                    break;
446
                case 1:
447
                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
448
                    out[0] = out[1] = pix & 0xFF;
449
                    out[2] = out[3] = pix >> 8;
450
                    out += stride;
451
                    out[0] = out[1] = pix & 0xFF;
452
                    out[2] = out[3] = pix >> 8;
453
                    out += stride;
454
                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
455
                    out[0] = out[1] = pix & 0xFF;
456
                    out[2] = out[3] = pix >> 8;
457
                    out += stride;
458
                    out[0] = out[1] = pix & 0xFF;
459
                    out[2] = out[3] = pix >> 8;
460
                    out += stride;
461
                    break;
462
                case 2:
463
                    for(i = 0; i < 2; i++) {
464
                        uint16_t pix1, pix2;
465
                        pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
466
                        pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
467
                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
468
                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
469
                        out += stride;
470
                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
471
                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
472
                        out += stride;
473
                    }
474
                    break;
475
                }
476
                blk++;
477
            }
478
            break;
479
        case SMK_BLK_SKIP:
480
            while(run-- && blk < blocks)
481
                blk++;
482
            break;
483
        case SMK_BLK_FILL:
484
            mode = type >> 8;
485
            while(run-- && blk < blocks){
486
                uint32_t col;
487
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
488
                col = mode * 0x01010101;
489
                for(i = 0; i < 4; i++) {
490
                    *((uint32_t*)out) = col;
491
                    out += stride;
492
                }
493
                blk++;
494
            }
495
            break;
496
        }
497
498
    }
499
500
    *data_size = sizeof(AVFrame);
501
    *(AVFrame*)data = smk->pic;
502
503
    /* always report that the buffer was completely consumed */
504
    return buf_size;
505
}
506
507
508
509
/*
510
 *
511
 * Init smacker decoder
512
 *
513
 */
514
static int decode_init(AVCodecContext *avctx)
515
{
516
    SmackVContext * const c = (SmackVContext *)avctx->priv_data;
517
518
    c->avctx = avctx;
519
    avctx->has_b_frames = 0;
520
521
    c->pic.data[0] = NULL;
522
523
    if (avcodec_check_dimensions(avctx, avctx->height, avctx->width) < 0) {
524
        return 1;
525
    }
526
527
    avctx->pix_fmt = PIX_FMT_PAL8;
528
529
530
    /* decode huffman trees from extradata */
531
    if(avctx->extradata_size < 16){
532
        av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
533
        return -1;
534
    }
535
536
    decode_header_trees(c);
537
538
539
    return 0;
540
}
541
542
543
544
/*
545
 *
546
 * Uninit smacker decoder
547
 *
548
 */
549
static int decode_end(AVCodecContext *avctx)
550
{
551
    SmackVContext * const smk = (SmackVContext *)avctx->priv_data;
552
553
    if(smk->mmap_tbl)
554
        av_free(smk->mmap_tbl);
555
    if(smk->mclr_tbl)
556
        av_free(smk->mclr_tbl);
557
    if(smk->full_tbl)
558
        av_free(smk->full_tbl);
559
    if(smk->type_tbl)
560
        av_free(smk->type_tbl);
561
562
    if (smk->pic.data[0])
563
        avctx->release_buffer(avctx, &smk->pic);
564
565
    return 0;
566
}
567
568
569
static int smka_decode_init(AVCodecContext *avctx)
570
{
571
    return 0;
572
}
573
574
/**
575
 * Decode Smacker audio data
576
 */
577
static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
578
{
579
    GetBitContext gb;
580
    HuffContext h[4];
581
    VLC vlc[4];
582
    int16_t *samples = data;
583
    int val;
584
    int i, res;
585
    int unp_size;
586
    int bits, stereo;
587
    int pred[2] = {0, 0};
588
589
    unp_size = LE_32(buf);
590
591
    init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
592
593
    if(!get_bits1(&gb)){
594
        av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
595
        *data_size = 0;
596
        return 1;
597
    }
598
    stereo = get_bits1(&gb);
599
    bits = get_bits1(&gb);
600
601
    memset(vlc, 0, sizeof(VLC) * 4);
602
    memset(h, 0, sizeof(HuffContext) * 4);
603
    // Initialize
604
    for(i = 0; i < (1 << (bits + stereo)); i++) {
605
        h[i].length = 256;
606
        h[i].maxlength = 0;
607
        h[i].current = 0;
608
        h[i].bits = av_mallocz(256 * 4);
609
        h[i].lengths = av_mallocz(256 * sizeof(int));
610
        h[i].values = av_mallocz(256 * sizeof(int));
611
        get_bits1(&gb);
612
        smacker_decode_tree(&gb, &h[i], 0, 0);
613
        get_bits1(&gb);
614 76fabb45 Kostya Shishkov
        if(h[i].current > 1) {
615
            res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
616 348efc18 Kostya Shishkov
                    h[i].lengths, sizeof(int), sizeof(int),
617
                    h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
618 76fabb45 Kostya Shishkov
            if(res < 0) {
619
                av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
620
                return -1;
621
            }
622 348efc18 Kostya Shishkov
        }
623
    }
624
    if(bits) { //decode 16-bit data
625
        pred[0]  = get_bits(&gb, 8);
626
        pred[0] |= get_bits(&gb, 8);
627 76fabb45 Kostya Shishkov
        *samples++ = pred[0];
628 348efc18 Kostya Shishkov
        if(stereo) {
629
            pred[1]  = get_bits(&gb, 8);
630
            pred[1] |= get_bits(&gb, 8);
631 76fabb45 Kostya Shishkov
            *samples++ = pred[1];
632 348efc18 Kostya Shishkov
        }
633
        for(i = 0; i < unp_size / 2; i++) {
634
            if(i & stereo) {
635 76fabb45 Kostya Shishkov
                if(vlc[2].table)
636
                    res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
637
                else
638
                    res = 0;
639
                val  = h[2].values[res];
640
                if(vlc[3].table)
641
                    res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
642
                else
643
                    res = 0;
644
                val |= h[3].values[res] << 8;
645
                pred[1] += (int16_t)val;
646 348efc18 Kostya Shishkov
                *samples++ = pred[1];
647
            } else {
648 76fabb45 Kostya Shishkov
                if(vlc[0].table)
649
                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
650
                else
651
                    res = 0;
652
                val  = h[0].values[res];
653
                if(vlc[1].table)
654
                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
655
                else
656
                    res = 0;
657
                val |= h[1].values[res] << 8;
658 348efc18 Kostya Shishkov
                pred[0] += val;
659
                *samples++ = pred[0];
660
            }
661
        }
662
    } else { //8-bit data
663
        pred[0] = get_bits(&gb, 8);
664 76fabb45 Kostya Shishkov
        *samples++ = (pred[0] - 0x80) << 8;
665
        if(stereo) {
666 348efc18 Kostya Shishkov
            pred[1] = get_bits(&gb, 8);
667 76fabb45 Kostya Shishkov
            *samples++ = (pred[1] - 0x80) << 8;
668
        }
669 348efc18 Kostya Shishkov
        for(i = 0; i < unp_size; i++) {
670
            if(i & stereo){
671 76fabb45 Kostya Shishkov
                if(vlc[1].table)
672
                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
673
                else
674
                    res = 0;
675
                pred[1] += (int8_t)h[1].values[res];
676 348efc18 Kostya Shishkov
                *samples++ = (pred[1] - 0x80) << 8;
677
            } else {
678 76fabb45 Kostya Shishkov
                if(vlc[0].table)
679
                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
680
                else
681
                    res = 0;
682
                pred[0] += (int8_t)h[0].values[res];
683 348efc18 Kostya Shishkov
                *samples++ = (pred[0] - 0x80) << 8;
684
            }
685
        }
686
        unp_size *= 2;
687
    }
688
689
    for(i = 0; i < 4; i++) {
690
        if(vlc[i].table)
691
            free_vlc(&vlc[i]);
692
        if(h[i].bits)
693
            av_free(h[i].bits);
694
        if(h[i].lengths)
695
            av_free(h[i].lengths);
696
        if(h[i].values)
697
            av_free(h[i].values);
698
    }
699
700
    *data_size = unp_size;
701
    return buf_size;
702
}
703
704
AVCodec smacker_decoder = {
705
    "smackvid",
706
    CODEC_TYPE_VIDEO,
707
    CODEC_ID_SMACKVIDEO,
708
    sizeof(SmackVContext),
709
    decode_init,
710
    NULL,
711
    decode_end,
712
    decode_frame
713
};
714
715
AVCodec smackaud_decoder = {
716
    "smackaud",
717
    CODEC_TYPE_AUDIO,
718
    CODEC_ID_SMACKAUDIO,
719
    0,
720
    smka_decode_init,
721
    NULL,
722
    NULL,
723
    smka_decode_frame
724
};