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ffmpeg / libavcodec / smacker.c @ 2029f312

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1
/*
2
 * Smacker decoder
3
 * Copyright (c) 2006 Konstantin Shishkov
4
 *
5
 * This file is part of FFmpeg.
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 *
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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,
13
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
15
 * 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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 *
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 */
22

    
23
/**
24
 * @file smacker.c
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 * Smacker decoder
26
 */
27

    
28
/*
29
 * Based on http://wiki.multimedia.cx/index.php?title=Smacker
30
 */
31

    
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#include <stdio.h>
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#include <stdlib.h>
34

    
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#include "avcodec.h"
36

    
37
#define ALT_BITSTREAM_READER_LE
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#include "bitstream.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 {
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    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 {
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    int length;
59
    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;
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;
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            hc->lengths[hc->current] = 0;
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        }
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
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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);
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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;
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);
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        get_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
        get_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
    get_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_bits(&gb, 1)) {
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_bits(&gb, 1)) {
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_bits(&gb, 1)) {
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, 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
    out = buf + 1;
372
    pal = (uint32_t*)smk->pic.data[1];
373
    smk->pic.palette_has_changed = buf[0] & 1;
374
    smk->pic.key_frame = !!(buf[0] & 2);
375
    if(smk->pic.key_frame)
376
        smk->pic.pict_type = FF_I_TYPE;
377
    else
378
        smk->pic.pict_type = FF_P_TYPE;
379

    
380
    for(i = 0; i < 256; i++) {
381
        int r, g, b;
382
        r = *out++;
383
        g = *out++;
384
        b = *out++;
385
        *pal++ = (r << 16) | (g << 8) | b;
386
    }
387

    
388
    last_reset(smk->mmap_tbl, smk->mmap_last);
389
    last_reset(smk->mclr_tbl, smk->mclr_last);
390
    last_reset(smk->full_tbl, smk->full_last);
391
    last_reset(smk->type_tbl, smk->type_last);
392
    init_get_bits(&gb, buf + 769, (buf_size - 769) * 8);
393

    
394
    blk = 0;
395
    bw = avctx->width >> 2;
396
    bh = avctx->height >> 2;
397
    blocks = bw * bh;
398
    out = smk->pic.data[0];
399
    stride = smk->pic.linesize[0];
400
    while(blk < blocks) {
401
        int type, run, mode;
402
        uint16_t pix;
403

    
404
        type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
405
        run = block_runs[(type >> 2) & 0x3F];
406
        switch(type & 3){
407
        case SMK_BLK_MONO:
408
            while(run-- && blk < blocks){
409
                int clr, map;
410
                int hi, lo;
411
                clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
412
                map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
413
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
414
                hi = clr >> 8;
415
                lo = clr & 0xFF;
416
                for(i = 0; i < 4; i++) {
417
                    if(map & 1) out[0] = hi; else out[0] = lo;
418
                    if(map & 2) out[1] = hi; else out[1] = lo;
419
                    if(map & 4) out[2] = hi; else out[2] = lo;
420
                    if(map & 8) out[3] = hi; else out[3] = lo;
421
                    map >>= 4;
422
                    out += stride;
423
                }
424
                blk++;
425
            }
426
            break;
427
        case SMK_BLK_FULL:
428
            mode = 0;
429
            if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
430
                if(get_bits1(&gb)) mode = 1;
431
                else if(get_bits1(&gb)) mode = 2;
432
            }
433
            while(run-- && blk < blocks){
434
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
435
                switch(mode){
436
                case 0:
437
                    for(i = 0; i < 4; i++) {
438
                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
439
                        out[2] = pix & 0xFF;
440
                        out[3] = pix >> 8;
441
                        pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
442
                        out[0] = pix & 0xFF;
443
                        out[1] = pix >> 8;
444
                        out += stride;
445
                    }
446
                    break;
447
                case 1:
448
                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
449
                    out[0] = out[1] = pix & 0xFF;
450
                    out[2] = out[3] = pix >> 8;
451
                    out += stride;
452
                    out[0] = out[1] = pix & 0xFF;
453
                    out[2] = out[3] = pix >> 8;
454
                    out += stride;
455
                    pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
456
                    out[0] = out[1] = pix & 0xFF;
457
                    out[2] = out[3] = pix >> 8;
458
                    out += stride;
459
                    out[0] = out[1] = pix & 0xFF;
460
                    out[2] = out[3] = pix >> 8;
461
                    out += stride;
462
                    break;
463
                case 2:
464
                    for(i = 0; i < 2; i++) {
465
                        uint16_t pix1, pix2;
466
                        pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
467
                        pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
468
                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
469
                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
470
                        out += stride;
471
                        out[0] = pix1 & 0xFF; out[1] = pix1 >> 8;
472
                        out[2] = pix2 & 0xFF; out[3] = pix2 >> 8;
473
                        out += stride;
474
                    }
475
                    break;
476
                }
477
                blk++;
478
            }
479
            break;
480
        case SMK_BLK_SKIP:
481
            while(run-- && blk < blocks)
482
                blk++;
483
            break;
484
        case SMK_BLK_FILL:
485
            mode = type >> 8;
486
            while(run-- && blk < blocks){
487
                uint32_t col;
488
                out = smk->pic.data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
489
                col = mode * 0x01010101;
490
                for(i = 0; i < 4; i++) {
491
                    *((uint32_t*)out) = col;
492
                    out += stride;
493
                }
494
                blk++;
495
            }
496
            break;
497
        }
498

    
499
    }
500

    
501
    *data_size = sizeof(AVFrame);
502
    *(AVFrame*)data = smk->pic;
503

    
504
    /* always report that the buffer was completely consumed */
505
    return buf_size;
506
}
507

    
508

    
509

    
510
/*
511
 *
512
 * Init smacker decoder
513
 *
514
 */
515
static int decode_init(AVCodecContext *avctx)
516
{
517
    SmackVContext * const c = avctx->priv_data;
518

    
519
    c->avctx = avctx;
520

    
521
    c->pic.data[0] = NULL;
522

    
523
    if (avcodec_check_dimensions(avctx, avctx->width, avctx->height) < 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 = avctx->priv_data;
552

    
553
    av_freep(&smk->mmap_tbl);
554
    av_freep(&smk->mclr_tbl);
555
    av_freep(&smk->full_tbl);
556
    av_freep(&smk->type_tbl);
557

    
558
    if (smk->pic.data[0])
559
        avctx->release_buffer(avctx, &smk->pic);
560

    
561
    return 0;
562
}
563

    
564

    
565
static int smka_decode_init(AVCodecContext *avctx)
566
{
567
    return 0;
568
}
569

    
570
/**
571
 * Decode Smacker audio data
572
 */
573
static int smka_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size)
574
{
575
    GetBitContext gb;
576
    HuffContext h[4];
577
    VLC vlc[4];
578
    int16_t *samples = data;
579
    int val;
580
    int i, res;
581
    int unp_size;
582
    int bits, stereo;
583
    int pred[2] = {0, 0};
584

    
585
    unp_size = AV_RL32(buf);
586

    
587
    init_get_bits(&gb, buf + 4, (buf_size - 4) * 8);
588

    
589
    if(!get_bits1(&gb)){
590
        av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
591
        *data_size = 0;
592
        return 1;
593
    }
594
    stereo = get_bits1(&gb);
595
    bits = get_bits1(&gb);
596

    
597
    memset(vlc, 0, sizeof(VLC) * 4);
598
    memset(h, 0, sizeof(HuffContext) * 4);
599
    // Initialize
600
    for(i = 0; i < (1 << (bits + stereo)); i++) {
601
        h[i].length = 256;
602
        h[i].maxlength = 0;
603
        h[i].current = 0;
604
        h[i].bits = av_mallocz(256 * 4);
605
        h[i].lengths = av_mallocz(256 * sizeof(int));
606
        h[i].values = av_mallocz(256 * sizeof(int));
607
        get_bits1(&gb);
608
        smacker_decode_tree(&gb, &h[i], 0, 0);
609
        get_bits1(&gb);
610
        if(h[i].current > 1) {
611
            res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
612
                    h[i].lengths, sizeof(int), sizeof(int),
613
                    h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
614
            if(res < 0) {
615
                av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
616
                return -1;
617
            }
618
        }
619
    }
620
    if(bits) { //decode 16-bit data
621
        for(i = stereo; i >= 0; i--)
622
            pred[i] = bswap_16(get_bits(&gb, 16));
623
        for(i = 0; i < stereo; i++)
624
            *samples++ = pred[i];
625
        for(i = 0; i < unp_size / 2; i++) {
626
            if(i & stereo) {
627
                if(vlc[2].table)
628
                    res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
629
                else
630
                    res = 0;
631
                val  = h[2].values[res];
632
                if(vlc[3].table)
633
                    res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
634
                else
635
                    res = 0;
636
                val |= h[3].values[res] << 8;
637
                pred[1] += (int16_t)val;
638
                *samples++ = pred[1];
639
            } else {
640
                if(vlc[0].table)
641
                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
642
                else
643
                    res = 0;
644
                val  = h[0].values[res];
645
                if(vlc[1].table)
646
                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
647
                else
648
                    res = 0;
649
                val |= h[1].values[res] << 8;
650
                pred[0] += val;
651
                *samples++ = pred[0];
652
            }
653
        }
654
    } else { //8-bit data
655
        for(i = stereo; i >= 0; i--)
656
            pred[i] = get_bits(&gb, 8);
657
        for(i = 0; i < stereo; i++)
658
            *samples++ = (pred[i] - 0x80) << 8;
659
        for(i = 0; i < unp_size; i++) {
660
            if(i & stereo){
661
                if(vlc[1].table)
662
                    res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
663
                else
664
                    res = 0;
665
                pred[1] += (int8_t)h[1].values[res];
666
                *samples++ = (pred[1] - 0x80) << 8;
667
            } else {
668
                if(vlc[0].table)
669
                    res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
670
                else
671
                    res = 0;
672
                pred[0] += (int8_t)h[0].values[res];
673
                *samples++ = (pred[0] - 0x80) << 8;
674
            }
675
        }
676
        unp_size *= 2;
677
    }
678

    
679
    for(i = 0; i < 4; i++) {
680
        if(vlc[i].table)
681
            free_vlc(&vlc[i]);
682
        if(h[i].bits)
683
            av_free(h[i].bits);
684
        if(h[i].lengths)
685
            av_free(h[i].lengths);
686
        if(h[i].values)
687
            av_free(h[i].values);
688
    }
689

    
690
    *data_size = unp_size;
691
    return buf_size;
692
}
693

    
694
AVCodec smacker_decoder = {
695
    "smackvid",
696
    CODEC_TYPE_VIDEO,
697
    CODEC_ID_SMACKVIDEO,
698
    sizeof(SmackVContext),
699
    decode_init,
700
    NULL,
701
    decode_end,
702
    decode_frame
703
};
704

    
705
AVCodec smackaud_decoder = {
706
    "smackaud",
707
    CODEC_TYPE_AUDIO,
708
    CODEC_ID_SMACKAUDIO,
709
    0,
710
    smka_decode_init,
711
    NULL,
712
    NULL,
713
    smka_decode_frame
714
};
715