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ffmpeg / libavcodec / smacker.c @ 909063f7

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1
/*
2
 * Smacker decoder
3
 * Copyright (c) 2006 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
6
 *
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 * FFmpeg is free software; you can redistribute it and/or
8
 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
10
 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * FFmpeg 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
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 * 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 FFmpeg; 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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 */
21

    
22
/**
23
 * @file smacker.c
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 * 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

    
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#define ALT_BITSTREAM_READER_LE
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#include "bitstream.h"
38
#include "bytestream.h"
39

    
40
#define SMKTREE_BITS 9
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#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;
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    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;
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    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;
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    int lcur;
73
} DBCtx;
74

    
75
/* 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,
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;
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            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);
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        hc->current++;
111
        if(hc->maxlength < length)
112
            hc->maxlength = length;
113
        return 0;
114
    } else { //Node
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        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
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        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;
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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;
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;
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            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