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Imported Debian version 2.4.3~trusty1
[deb_ffmpeg.git] / ffmpeg / libavcodec / smacker.c
CommitLineData
2ba45a60
DM		 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 "libavutil/channel_layout.h"
35#include "avcodec.h"
36#include "internal.h"
37#include "mathops.h"
38
39#define BITSTREAM_READER_LE
40#include "get_bits.h"
41#include "bytestream.h"
42
43#define SMKTREE_BITS 9
44#define SMK_NODE 0x80000000
45
46/*
47 * Decoder context
48 */
49typedef struct SmackVContext {
50 AVCodecContext *avctx;
51 AVFrame *pic;
52
53 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
54 int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
55} SmackVContext;
56
57/**
58 * Context used for code reconstructing
59 */
60typedef struct HuffContext {
61 int length;
62 int maxlength;
63 int current;
64 uint32_t *bits;
65 int *lengths;
66 int *values;
67} HuffContext;
68
69/* common parameters used for decode_bigtree */
70typedef struct DBCtx {
71 VLC *v1, *v2;
72 int *recode1, *recode2;
73 int escapes[3];
74 int *last;
75 int lcur;
76} DBCtx;
77
78/* possible runs of blocks */
79static const int block_runs[64] = {
80 1, 2, 3, 4, 5, 6, 7, 8,
81 9, 10, 11, 12, 13, 14, 15, 16,
82 17, 18, 19, 20, 21, 22, 23, 24,
83 25, 26, 27, 28, 29, 30, 31, 32,
84 33, 34, 35, 36, 37, 38, 39, 40,
85 41, 42, 43, 44, 45, 46, 47, 48,
86 49, 50, 51, 52, 53, 54, 55, 56,
87 57, 58, 59, 128, 256, 512, 1024, 2048 };
88
89enum SmkBlockTypes {
90 SMK_BLK_MONO = 0,
91 SMK_BLK_FULL = 1,
92 SMK_BLK_SKIP = 2,
93 SMK_BLK_FILL = 3 };
94
95/**
96 * Decode local frame tree
97 */
98static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
99{
100 if(length > 32 || length > 3*SMKTREE_BITS) {
101 av_log(NULL, AV_LOG_ERROR, "length too long\n");
102 return AVERROR_INVALIDDATA;
103 }
104 if(!get_bits1(gb)){ //Leaf
105 if(hc->current >= hc->length){
106 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
107 return AVERROR_INVALIDDATA;
108 }
109 if(length){
110 hc->bits[hc->current] = prefix;
111 hc->lengths[hc->current] = length;
112 } else {
113 hc->bits[hc->current] = 0;
114 hc->lengths[hc->current] = 0;
115 }
116 hc->values[hc->current] = get_bits(gb, 8);
117 hc->current++;
118 if(hc->maxlength < length)
119 hc->maxlength = length;
120 return 0;
121 } else { //Node
122 int r;
123 length++;
124 r = smacker_decode_tree(gb, hc, prefix, length);
125 if(r)
126 return r;
127 return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
128 }
129}
130
131/**
132 * Decode header tree
133 */
134static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
135{
136 if (hc->current + 1 >= hc->length) {
137 av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
138 return AVERROR_INVALIDDATA;
139 }
140 if(!get_bits1(gb)){ //Leaf
141 int val, i1, i2;
142 i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
143 i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
144 if (i1 < 0 || i2 < 0)
145 return AVERROR_INVALIDDATA;
146 val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
147 if(val == ctx->escapes[0]) {
148 ctx->last[0] = hc->current;
149 val = 0;
150 } else if(val == ctx->escapes[1]) {
151 ctx->last[1] = hc->current;
152 val = 0;
153 } else if(val == ctx->escapes[2]) {
154 ctx->last[2] = hc->current;
155 val = 0;
156 }
157
158 hc->values[hc->current++] = val;
159 return 1;
160 } else { //Node
161 int r = 0, r_new, t;
162
163 t = hc->current++;
164 r = smacker_decode_bigtree(gb, hc, ctx);
165 if(r < 0)
166 return r;
167 hc->values[t] = SMK_NODE | r;
168 r++;
169 r_new = smacker_decode_bigtree(gb, hc, ctx);
170 if (r_new < 0)
171 return r_new;
172 return r + r_new;
173 }
174}
175
176/**
177 * Store large tree as FFmpeg's vlc codes
178 */
179static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
180{
181 int res;
182 HuffContext huff;
183 HuffContext tmp1, tmp2;
184 VLC vlc[2] = { { 0 } };
185 int escapes[3];
186 DBCtx ctx;
187 int err = 0;
188
189 if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
190 av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
191 return AVERROR_INVALIDDATA;
192 }
193
194 tmp1.length = 256;
195 tmp1.maxlength = 0;
196 tmp1.current = 0;
197 tmp1.bits = av_mallocz(256 * 4);
198 tmp1.lengths = av_mallocz(256 * sizeof(int));
199 tmp1.values = av_mallocz(256 * sizeof(int));
200
201 tmp2.length = 256;
202 tmp2.maxlength = 0;
203 tmp2.current = 0;
204 tmp2.bits = av_mallocz(256 * 4);
205 tmp2.lengths = av_mallocz(256 * sizeof(int));
206 tmp2.values = av_mallocz(256 * sizeof(int));
207 if (!tmp1.bits || !tmp1.lengths || !tmp1.values ||
208 !tmp2.bits || !tmp2.lengths || !tmp2.values) {
209 err = AVERROR(ENOMEM);
210 goto error;
211 }
212
213 if(get_bits1(gb)) {
214 res = smacker_decode_tree(gb, &tmp1, 0, 0);
215 if (res < 0) {
216 err = res;
217 goto error;
218 }
219 skip_bits1(gb);
220 if(tmp1.current > 1) {
221 res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
222 tmp1.lengths, sizeof(int), sizeof(int),
223 tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
224 if(res < 0) {
225 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
226 err = res;
227 goto error;
228 }
229 }
230 }
231 if (!vlc[0].table) {
232 av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
233 }
234 if(get_bits1(gb)){
235 res = smacker_decode_tree(gb, &tmp2, 0, 0);
236 if (res < 0) {
237 err = res;
238 goto error;
239 }
240 skip_bits1(gb);
241 if(tmp2.current > 1) {
242 res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
243 tmp2.lengths, sizeof(int), sizeof(int),
244 tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
245 if(res < 0) {
246 av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
247 err = res;
248 goto error;
249 }
250 }
251 }
252 if (!vlc[1].table) {
253 av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
254 }
255
256 escapes[0] = get_bits(gb, 16);
257 escapes[1] = get_bits(gb, 16);
258 escapes[2] = get_bits(gb, 16);
259
260 last[0] = last[1] = last[2] = -1;
261
262 ctx.escapes[0] = escapes[0];
263 ctx.escapes[1] = escapes[1];
264 ctx.escapes[2] = escapes[2];
265 ctx.v1 = &vlc[0];
266 ctx.v2 = &vlc[1];
267 ctx.recode1 = tmp1.values;
268 ctx.recode2 = tmp2.values;
269 ctx.last = last;
270
271 huff.length = ((size + 3) >> 2) + 4;
272 huff.maxlength = 0;
273 huff.current = 0;
274 huff.values = av_mallocz_array(huff.length, sizeof(int));
275 if (!huff.values) {
276 err = AVERROR(ENOMEM);
277 goto error;
278 }
279
280 if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)
281 err = -1;
282 skip_bits1(gb);
283 if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
284 if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
285 if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
286 if (ctx.last[0] >= huff.length ||
287 ctx.last[1] >= huff.length ||
288 ctx.last[2] >= huff.length) {
289 av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n");
290 err = AVERROR_INVALIDDATA;
291 }
292
293 *recodes = huff.values;
294
295error:
296 if(vlc[0].table)
297 ff_free_vlc(&vlc[0]);
298 if(vlc[1].table)
299 ff_free_vlc(&vlc[1]);
300 av_free(tmp1.bits);
301 av_free(tmp1.lengths);
302 av_free(tmp1.values);
303 av_free(tmp2.bits);
304 av_free(tmp2.lengths);
305 av_free(tmp2.values);
306
307 return err;
308}
309
310static int decode_header_trees(SmackVContext *smk) {
311 GetBitContext gb;
312 int mmap_size, mclr_size, full_size, type_size, ret;
313
314 mmap_size = AV_RL32(smk->avctx->extradata);
315 mclr_size = AV_RL32(smk->avctx->extradata + 4);
316 full_size = AV_RL32(smk->avctx->extradata + 8);
317 type_size = AV_RL32(smk->avctx->extradata + 12);
318
319 init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
320
321 if(!get_bits1(&gb)) {
322 av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
323 smk->mmap_tbl = av_malloc(sizeof(int) * 2);
324 if (!smk->mmap_tbl)
325 return AVERROR(ENOMEM);
326 smk->mmap_tbl[0] = 0;
327 smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
328 } else {
329 ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
330 if (ret < 0)
331 return ret;
332 }
333 if(!get_bits1(&gb)) {
334 av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
335 smk->mclr_tbl = av_malloc(sizeof(int) * 2);
336 if (!smk->mclr_tbl)
337 return AVERROR(ENOMEM);
338 smk->mclr_tbl[0] = 0;
339 smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
340 } else {
341 ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
342 if (ret < 0)
343 return ret;
344 }
345 if(!get_bits1(&gb)) {
346 av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
347 smk->full_tbl = av_malloc(sizeof(int) * 2);
348 if (!smk->full_tbl)
349 return AVERROR(ENOMEM);
350 smk->full_tbl[0] = 0;
351 smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
352 } else {
353 ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
354 if (ret < 0)
355 return ret;
356 }
357 if(!get_bits1(&gb)) {
358 av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
359 smk->type_tbl = av_malloc(sizeof(int) * 2);
360 if (!smk->type_tbl)
361 return AVERROR(ENOMEM);
362 smk->type_tbl[0] = 0;
363 smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
364 } else {
365 ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
366 if (ret < 0)
367 return ret;
368 }
369
370 return 0;
371}
372
373static av_always_inline void last_reset(int *recode, int *last) {
374 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
375}
376
377/* get code and update history */
378static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
379 register int *table = recode;
380 int v;
381
382 while(*table & SMK_NODE) {
383 if(get_bits1(gb))
384 table += (*table) & (~SMK_NODE);
385 table++;
386 }
387 v = *table;
388
389 if(v != recode[last[0]]) {
390 recode[last[2]] = recode[last[1]];
391 recode[last[1]] = recode[last[0]];
392 recode[last[0]] = v;
393 }
394 return v;
395}
396
397static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
398 AVPacket *avpkt)
399{
400 SmackVContext * const smk = avctx->priv_data;
401 uint8_t *out;
402 uint32_t *pal;
403 GetByteContext gb2;
404 GetBitContext gb;
405 int blocks, blk, bw, bh;
406 int i, ret;
407 int stride;
408 int flags;
409
410 if (avpkt->size <= 769)
411 return AVERROR_INVALIDDATA;
412
413 if ((ret = ff_reget_buffer(avctx, smk->pic)) < 0)
414 return ret;
415
416 /* make the palette available on the way out */
417 pal = (uint32_t*)smk->pic->data[1];
418 bytestream2_init(&gb2, avpkt->data, avpkt->size);
419 flags = bytestream2_get_byteu(&gb2);
420 smk->pic->palette_has_changed = flags & 1;
421 smk->pic->key_frame = !!(flags & 2);
422 if (smk->pic->key_frame)
423 smk->pic->pict_type = AV_PICTURE_TYPE_I;
424 else
425 smk->pic->pict_type = AV_PICTURE_TYPE_P;
426
427 for(i = 0; i < 256; i++)
428 *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);
429
430 last_reset(smk->mmap_tbl, smk->mmap_last);
431 last_reset(smk->mclr_tbl, smk->mclr_last);
432 last_reset(smk->full_tbl, smk->full_last);
433 last_reset(smk->type_tbl, smk->type_last);
434 if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0)
435 return ret;
436
437 blk = 0;
438 bw = avctx->width >> 2;
439 bh = avctx->height >> 2;
440 blocks = bw * bh;
441 stride = smk->pic->linesize[0];
442 while(blk < blocks) {
443 int type, run, mode;
444 uint16_t pix;
445
446 type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
447 run = block_runs[(type >> 2) & 0x3F];
448 switch(type & 3){
449 case SMK_BLK_MONO:
450 while(run-- && blk < blocks){
451 int clr, map;
452 int hi, lo;
453 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
454 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
455 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
456 hi = clr >> 8;
457 lo = clr & 0xFF;
458 for(i = 0; i < 4; i++) {
459 if(map & 1) out[0] = hi; else out[0] = lo;
460 if(map & 2) out[1] = hi; else out[1] = lo;
461 if(map & 4) out[2] = hi; else out[2] = lo;
462 if(map & 8) out[3] = hi; else out[3] = lo;
463 map >>= 4;
464 out += stride;
465 }
466 blk++;
467 }
468 break;
469 case SMK_BLK_FULL:
470 mode = 0;
471 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
472 if(get_bits1(&gb)) mode = 1;
473 else if(get_bits1(&gb)) mode = 2;
474 }
475 while(run-- && blk < blocks){
476 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
477 switch(mode){
478 case 0:
479 for(i = 0; i < 4; i++) {
480 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
481 AV_WL16(out+2,pix);
482 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
483 AV_WL16(out,pix);
484 out += stride;
485 }
486 break;
487 case 1:
488 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
489 out[0] = out[1] = pix & 0xFF;
490 out[2] = out[3] = pix >> 8;
491 out += stride;
492 out[0] = out[1] = pix & 0xFF;
493 out[2] = out[3] = pix >> 8;
494 out += stride;
495 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
496 out[0] = out[1] = pix & 0xFF;
497 out[2] = out[3] = pix >> 8;
498 out += stride;
499 out[0] = out[1] = pix & 0xFF;
500 out[2] = out[3] = pix >> 8;
501 break;
502 case 2:
503 for(i = 0; i < 2; i++) {
504 uint16_t pix1, pix2;
505 pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
506 pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
507 AV_WL16(out,pix1);
508 AV_WL16(out+2,pix2);
509 out += stride;
510 AV_WL16(out,pix1);
511 AV_WL16(out+2,pix2);
512 out += stride;
513 }
514 break;
515 }
516 blk++;
517 }
518 break;
519 case SMK_BLK_SKIP:
520 while(run-- && blk < blocks)
521 blk++;
522 break;
523 case SMK_BLK_FILL:
524 mode = type >> 8;
525 while(run-- && blk < blocks){
526 uint32_t col;
527 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
528 col = mode * 0x01010101;
529 for(i = 0; i < 4; i++) {
530 *((uint32_t*)out) = col;
531 out += stride;
532 }
533 blk++;
534 }
535 break;
536 }
537
538 }
539
540 if ((ret = av_frame_ref(data, smk->pic)) < 0)
541 return ret;
542
543 *got_frame = 1;
544
545 /* always report that the buffer was completely consumed */
546 return avpkt->size;
547}
548
549
550
551/*
552 *
553 * Uninit smacker decoder
554 *
555 */
556static av_cold int decode_end(AVCodecContext *avctx)
557{
558 SmackVContext * const smk = avctx->priv_data;
559
560 av_freep(&smk->mmap_tbl);
561 av_freep(&smk->mclr_tbl);
562 av_freep(&smk->full_tbl);
563 av_freep(&smk->type_tbl);
564
565 av_frame_free(&smk->pic);
566
567 return 0;
568}
569
570
571/*
572 *
573 * Init smacker decoder
574 *
575 */
576static av_cold int decode_init(AVCodecContext *avctx)
577{
578 SmackVContext * const c = avctx->priv_data;
579 int ret;
580
581 c->avctx = avctx;
582
583 avctx->pix_fmt = AV_PIX_FMT_PAL8;
584
585 c->pic = av_frame_alloc();
586 if (!c->pic)
587 return AVERROR(ENOMEM);
588
589 /* decode huffman trees from extradata */
590 if(avctx->extradata_size < 16){
591 av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
592 return AVERROR(EINVAL);
593 }
594
595 ret = decode_header_trees(c);
596 if (ret < 0) {
597 decode_end(avctx);
598 return ret;
599 }
600
601 return 0;
602}
603
604
605static av_cold int smka_decode_init(AVCodecContext *avctx)
606{
607 if (avctx->channels < 1 || avctx->channels > 2) {
608 av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
609 return AVERROR(EINVAL);
610 }
611 avctx->channel_layout = (avctx->channels==2) ? AV_CH_LAYOUT_STEREO : AV_CH_LAYOUT_MONO;
612 avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
613
614 return 0;
615}
616
617/**
618 * Decode Smacker audio data
619 */
620static int smka_decode_frame(AVCodecContext *avctx, void *data,
621 int *got_frame_ptr, AVPacket *avpkt)
622{
623 AVFrame *frame = data;
624 const uint8_t *buf = avpkt->data;
625 int buf_size = avpkt->size;
626 GetBitContext gb;
627 HuffContext h[4] = { { 0 } };
628 VLC vlc[4] = { { 0 } };
629 int16_t *samples;
630 uint8_t *samples8;
631 int val;
632 int i, res, ret;
633 int unp_size;
634 int bits, stereo;
635 int pred[2] = {0, 0};
636
637 if (buf_size <= 4) {
638 av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
639 return AVERROR(EINVAL);
640 }
641
642 unp_size = AV_RL32(buf);
643
644 if (unp_size > (1U<<24)) {
645 av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
646 return AVERROR_INVALIDDATA;
647 }
648
649 if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)
650 return ret;
651
652 if(!get_bits1(&gb)){
653 av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
654 *got_frame_ptr = 0;
655 return 1;
656 }
657 stereo = get_bits1(&gb);
658 bits = get_bits1(&gb);
659 if (stereo ^ (avctx->channels != 1)) {
660 av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
661 return AVERROR(EINVAL);
662 }
663 if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {
664 av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
665 return AVERROR(EINVAL);
666 }
667
668 /* get output buffer */
669 frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
670 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
671 return ret;
672 samples = (int16_t *)frame->data[0];
673 samples8 = frame->data[0];
674
675 // Initialize
676 for(i = 0; i < (1 << (bits + stereo)); i++) {
677 h[i].length = 256;
678 h[i].maxlength = 0;
679 h[i].current = 0;
680 h[i].bits = av_mallocz(256 * 4);
681 h[i].lengths = av_mallocz(256 * sizeof(int));
682 h[i].values = av_mallocz(256 * sizeof(int));
683 if (!h[i].bits || !h[i].lengths || !h[i].values) {
684 ret = AVERROR(ENOMEM);
685 goto error;
686 }
687 skip_bits1(&gb);
688 if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) {
689 ret = AVERROR_INVALIDDATA;
690 goto error;
691 }
692 skip_bits1(&gb);
693 if(h[i].current > 1) {
694 res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
695 h[i].lengths, sizeof(int), sizeof(int),
696 h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
697 if(res < 0) {
698 av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
699 ret = AVERROR_INVALIDDATA;
700 goto error;
701 }
702 }
703 }
704 /* this codec relies on wraparound instead of clipping audio */
705 if(bits) { //decode 16-bit data
706 for(i = stereo; i >= 0; i--)
707 pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
708 for(i = 0; i <= stereo; i++)
709 *samples++ = pred[i];
710 for(; i < unp_size / 2; i++) {
711 if(get_bits_left(&gb)<0)
712 return AVERROR_INVALIDDATA;
713 if(i & stereo) {
714 if(vlc[2].table)
715 res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
716 else
717 res = 0;
718 if (res < 0) {
719 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
720 return AVERROR_INVALIDDATA;
721 }
722 val = h[2].values[res];
723 if(vlc[3].table)
724 res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
725 else
726 res = 0;
727 if (res < 0) {
728 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
729 return AVERROR_INVALIDDATA;
730 }
731 val |= h[3].values[res] << 8;
732 pred[1] += sign_extend(val, 16);
733 *samples++ = pred[1];
734 } else {
735 if(vlc[0].table)
736 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
737 else
738 res = 0;
739 if (res < 0) {
740 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
741 return AVERROR_INVALIDDATA;
742 }
743 val = h[0].values[res];
744 if(vlc[1].table)
745 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
746 else
747 res = 0;
748 if (res < 0) {
749 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
750 return AVERROR_INVALIDDATA;
751 }
752 val |= h[1].values[res] << 8;
753 pred[0] += sign_extend(val, 16);
754 *samples++ = pred[0];
755 }
756 }
757 } else { //8-bit data
758 for(i = stereo; i >= 0; i--)
759 pred[i] = get_bits(&gb, 8);
760 for(i = 0; i <= stereo; i++)
761 *samples8++ = pred[i];
762 for(; i < unp_size; i++) {
763 if(get_bits_left(&gb)<0)
764 return AVERROR_INVALIDDATA;
765 if(i & stereo){
766 if(vlc[1].table)
767 res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
768 else
769 res = 0;
770 if (res < 0) {
771 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
772 return AVERROR_INVALIDDATA;
773 }
774 pred[1] += sign_extend(h[1].values[res], 8);
775 *samples8++ = pred[1];
776 } else {
777 if(vlc[0].table)
778 res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
779 else
780 res = 0;
781 if (res < 0) {
782 av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
783 return AVERROR_INVALIDDATA;
784 }
785 pred[0] += sign_extend(h[0].values[res], 8);
786 *samples8++ = pred[0];
787 }
788 }
789 }
790
791 *got_frame_ptr = 1;
792 ret = buf_size;
793
794error:
795 for(i = 0; i < 4; i++) {
796 if(vlc[i].table)
797 ff_free_vlc(&vlc[i]);
798 av_free(h[i].bits);
799 av_free(h[i].lengths);
800 av_free(h[i].values);
801 }
802
803 return ret;
804}
805
806AVCodec ff_smacker_decoder = {
807 .name = "smackvid",
808 .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
809 .type = AVMEDIA_TYPE_VIDEO,
810 .id = AV_CODEC_ID_SMACKVIDEO,
811 .priv_data_size = sizeof(SmackVContext),
812 .init = decode_init,
813 .close = decode_end,
814 .decode = decode_frame,
815 .capabilities = CODEC_CAP_DR1,
816};
817
818AVCodec ff_smackaud_decoder = {
819 .name = "smackaud",
820 .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
821 .type = AVMEDIA_TYPE_AUDIO,
822 .id = AV_CODEC_ID_SMACKAUDIO,
823 .init = smka_decode_init,
824 .decode = smka_decode_frame,
825 .capabilities = CODEC_CAP_DR1,
826};
ffmpeg Piment Noir Debian package repository