FFmpeg  4.3
smacker.c
Go to the documentation of this file.
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 
35 
36 #define BITSTREAM_READER_LE
37 #include "avcodec.h"
38 #include "bytestream.h"
39 #include "get_bits.h"
40 #include "internal.h"
41 #include "mathops.h"
42 
43 #define SMKTREE_BITS 9
44 #define SMK_NODE 0x80000000
45 
46 #define SMKTREE_DECODE_MAX_RECURSION 32
47 #define SMKTREE_DECODE_BIG_MAX_RECURSION 500
48 
49 typedef struct SmackVContext {
52 
54  int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
56 
57 /**
58  * Context used for code reconstructing
59  */
60 typedef 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 */
70 typedef 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 */
79 static 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 
93  SMK_BLK_FILL = 3 };
94 
95 /**
96  * Decode local frame tree
97  */
98 static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
99 {
100  if (length > SMKTREE_DECODE_MAX_RECURSION || length > 3 * SMKTREE_BITS) {
101  av_log(NULL, AV_LOG_ERROR, "Maximum tree recursion level exceeded.\n");
102  return AVERROR_INVALIDDATA;
103  }
104 
105  if(!get_bits1(gb)){ //Leaf
106  if(hc->current >= hc->length){
107  av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
108  return AVERROR_INVALIDDATA;
109  }
110  if(length){
111  hc->bits[hc->current] = prefix;
112  hc->lengths[hc->current] = length;
113  } else {
114  hc->bits[hc->current] = 0;
115  hc->lengths[hc->current] = 0;
116  }
117  hc->values[hc->current] = get_bits(gb, 8);
118  hc->current++;
119  if(hc->maxlength < length)
120  hc->maxlength = length;
121  return 0;
122  } else { //Node
123  int r;
124  length++;
125  r = smacker_decode_tree(gb, hc, prefix, length);
126  if(r)
127  return r;
128  return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
129  }
130 }
131 
132 /**
133  * Decode header tree
134  */
136  DBCtx *ctx, int length)
137 {
138  // Larger length can cause segmentation faults due to too deep recursion.
139  if (length > SMKTREE_DECODE_BIG_MAX_RECURSION) {
140  av_log(NULL, AV_LOG_ERROR, "Maximum bigtree recursion level exceeded.\n");
141  return AVERROR_INVALIDDATA;
142  }
143 
144  if (hc->current + 1 >= hc->length) {
145  av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
146  return AVERROR_INVALIDDATA;
147  }
148  if(!get_bits1(gb)){ //Leaf
149  int val, i1, i2;
150  i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
151  i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
152  if (i1 < 0 || i2 < 0)
153  return AVERROR_INVALIDDATA;
154  val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
155  if(val == ctx->escapes[0]) {
156  ctx->last[0] = hc->current;
157  val = 0;
158  } else if(val == ctx->escapes[1]) {
159  ctx->last[1] = hc->current;
160  val = 0;
161  } else if(val == ctx->escapes[2]) {
162  ctx->last[2] = hc->current;
163  val = 0;
164  }
165 
166  hc->values[hc->current++] = val;
167  return 1;
168  } else { //Node
169  int r = 0, r_new, t;
170 
171  t = hc->current++;
172  r = smacker_decode_bigtree(gb, hc, ctx, length + 1);
173  if(r < 0)
174  return r;
175  hc->values[t] = SMK_NODE | r;
176  r++;
177  r_new = smacker_decode_bigtree(gb, hc, ctx, length + 1);
178  if (r_new < 0)
179  return r_new;
180  return r + r_new;
181  }
182 }
183 
184 /**
185  * Store large tree as FFmpeg's vlc codes
186  */
187 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
188 {
189  int res;
190  HuffContext huff;
191  HuffContext tmp1, tmp2;
192  VLC vlc[2] = { { 0 } };
193  int escapes[3];
194  DBCtx ctx;
195  int err = 0;
196 
197  if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
198  av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
199  return AVERROR_INVALIDDATA;
200  }
201 
202  tmp1.length = 256;
203  tmp1.maxlength = 0;
204  tmp1.current = 0;
205  tmp1.bits = av_mallocz(256 * 4);
206  tmp1.lengths = av_mallocz(256 * sizeof(int));
207  tmp1.values = av_mallocz(256 * sizeof(int));
208 
209  tmp2.length = 256;
210  tmp2.maxlength = 0;
211  tmp2.current = 0;
212  tmp2.bits = av_mallocz(256 * 4);
213  tmp2.lengths = av_mallocz(256 * sizeof(int));
214  tmp2.values = av_mallocz(256 * sizeof(int));
215  if (!tmp1.bits || !tmp1.lengths || !tmp1.values ||
216  !tmp2.bits || !tmp2.lengths || !tmp2.values) {
217  err = AVERROR(ENOMEM);
218  goto error;
219  }
220 
221  if(get_bits1(gb)) {
222  res = smacker_decode_tree(gb, &tmp1, 0, 0);
223  if (res < 0) {
224  err = res;
225  goto error;
226  }
227  skip_bits1(gb);
228  if(tmp1.current > 1) {
229  res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
230  tmp1.lengths, sizeof(int), sizeof(int),
231  tmp1.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
232  if(res < 0) {
233  av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
234  err = res;
235  goto error;
236  }
237  }
238  }
239  if (!vlc[0].table) {
240  av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
241  }
242  if(get_bits1(gb)){
243  res = smacker_decode_tree(gb, &tmp2, 0, 0);
244  if (res < 0) {
245  err = res;
246  goto error;
247  }
248  skip_bits1(gb);
249  if(tmp2.current > 1) {
250  res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
251  tmp2.lengths, sizeof(int), sizeof(int),
252  tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
253  if(res < 0) {
254  av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
255  err = res;
256  goto error;
257  }
258  }
259  }
260  if (!vlc[1].table) {
261  av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
262  }
263 
264  escapes[0] = get_bits(gb, 16);
265  escapes[1] = get_bits(gb, 16);
266  escapes[2] = get_bits(gb, 16);
267 
268  last[0] = last[1] = last[2] = -1;
269 
270  ctx.escapes[0] = escapes[0];
271  ctx.escapes[1] = escapes[1];
272  ctx.escapes[2] = escapes[2];
273  ctx.v1 = &vlc[0];
274  ctx.v2 = &vlc[1];
275  ctx.recode1 = tmp1.values;
276  ctx.recode2 = tmp2.values;
277  ctx.last = last;
278 
279  huff.length = ((size + 3) >> 2) + 4;
280  huff.maxlength = 0;
281  huff.current = 0;
282  huff.values = av_mallocz_array(huff.length, sizeof(int));
283  if (!huff.values) {
284  err = AVERROR(ENOMEM);
285  goto error;
286  }
287 
288  res = smacker_decode_bigtree(gb, &huff, &ctx, 0);
289  if (res < 0)
290  err = res;
291  skip_bits1(gb);
292  if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
293  if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
294  if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
295  if (ctx.last[0] >= huff.length ||
296  ctx.last[1] >= huff.length ||
297  ctx.last[2] >= huff.length) {
298  av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n");
299  err = AVERROR_INVALIDDATA;
300  }
301 
302  *recodes = huff.values;
303 
304 error:
305  if(vlc[0].table)
306  ff_free_vlc(&vlc[0]);
307  if(vlc[1].table)
308  ff_free_vlc(&vlc[1]);
309  av_free(tmp1.bits);
310  av_free(tmp1.lengths);
311  av_free(tmp1.values);
312  av_free(tmp2.bits);
313  av_free(tmp2.lengths);
314  av_free(tmp2.values);
315 
316  return err;
317 }
318 
320  GetBitContext gb;
321  int mmap_size, mclr_size, full_size, type_size, ret;
322  int skip = 0;
323 
324  mmap_size = AV_RL32(smk->avctx->extradata);
325  mclr_size = AV_RL32(smk->avctx->extradata + 4);
326  full_size = AV_RL32(smk->avctx->extradata + 8);
327  type_size = AV_RL32(smk->avctx->extradata + 12);
328 
329  ret = init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
330  if (ret < 0)
331  return ret;
332 
333  if(!get_bits1(&gb)) {
334  skip ++;
335  av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
336  smk->mmap_tbl = av_malloc(sizeof(int) * 2);
337  if (!smk->mmap_tbl)
338  return AVERROR(ENOMEM);
339  smk->mmap_tbl[0] = 0;
340  smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
341  } else {
342  ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
343  if (ret < 0)
344  return ret;
345  }
346  if(!get_bits1(&gb)) {
347  skip ++;
348  av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
349  smk->mclr_tbl = av_malloc(sizeof(int) * 2);
350  if (!smk->mclr_tbl)
351  return AVERROR(ENOMEM);
352  smk->mclr_tbl[0] = 0;
353  smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
354  } else {
355  ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
356  if (ret < 0)
357  return ret;
358  }
359  if(!get_bits1(&gb)) {
360  skip ++;
361  av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
362  smk->full_tbl = av_malloc(sizeof(int) * 2);
363  if (!smk->full_tbl)
364  return AVERROR(ENOMEM);
365  smk->full_tbl[0] = 0;
366  smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
367  } else {
368  ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
369  if (ret < 0)
370  return ret;
371  }
372  if(!get_bits1(&gb)) {
373  skip ++;
374  av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
375  smk->type_tbl = av_malloc(sizeof(int) * 2);
376  if (!smk->type_tbl)
377  return AVERROR(ENOMEM);
378  smk->type_tbl[0] = 0;
379  smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
380  } else {
381  ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
382  if (ret < 0)
383  return ret;
384  }
385  if (skip == 4)
386  return AVERROR_INVALIDDATA;
387 
388  return 0;
389 }
390 
391 static av_always_inline void last_reset(int *recode, int *last) {
392  recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
393 }
394 
395 /* get code and update history */
396 static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
397  register int *table = recode;
398  int v;
399 
400  while(*table & SMK_NODE) {
401  if (get_bits_left(gb) < 1)
402  return AVERROR_INVALIDDATA;
403  if(get_bits1(gb))
404  table += (*table) & (~SMK_NODE);
405  table++;
406  }
407  v = *table;
408 
409  if(v != recode[last[0]]) {
410  recode[last[2]] = recode[last[1]];
411  recode[last[1]] = recode[last[0]];
412  recode[last[0]] = v;
413  }
414  return v;
415 }
416 
417 static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame,
418  AVPacket *avpkt)
419 {
420  SmackVContext * const smk = avctx->priv_data;
421  uint8_t *out;
422  uint32_t *pal;
423  GetByteContext gb2;
424  GetBitContext gb;
425  int blocks, blk, bw, bh;
426  int i, ret;
427  int stride;
428  int flags;
429 
430  if (avpkt->size <= 769)
431  return AVERROR_INVALIDDATA;
432 
433  if ((ret = ff_reget_buffer(avctx, smk->pic, 0)) < 0)
434  return ret;
435 
436  /* make the palette available on the way out */
437  pal = (uint32_t*)smk->pic->data[1];
438  bytestream2_init(&gb2, avpkt->data, avpkt->size);
439  flags = bytestream2_get_byteu(&gb2);
440  smk->pic->palette_has_changed = flags & 1;
441  smk->pic->key_frame = !!(flags & 2);
442  if (smk->pic->key_frame)
444  else
446 
447  for(i = 0; i < 256; i++)
448  *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);
449 
450  last_reset(smk->mmap_tbl, smk->mmap_last);
451  last_reset(smk->mclr_tbl, smk->mclr_last);
452  last_reset(smk->full_tbl, smk->full_last);
453  last_reset(smk->type_tbl, smk->type_last);
454  if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0)
455  return ret;
456 
457  blk = 0;
458  bw = avctx->width >> 2;
459  bh = avctx->height >> 2;
460  blocks = bw * bh;
461  stride = smk->pic->linesize[0];
462  while(blk < blocks) {
463  int type, run, mode;
464  uint16_t pix;
465 
466  type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
467  if (type < 0)
468  return type;
469  run = block_runs[(type >> 2) & 0x3F];
470  switch(type & 3){
471  case SMK_BLK_MONO:
472  while(run-- && blk < blocks){
473  int clr, map;
474  int hi, lo;
475  clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
476  map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
477  out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
478  hi = clr >> 8;
479  lo = clr & 0xFF;
480  for(i = 0; i < 4; i++) {
481  if(map & 1) out[0] = hi; else out[0] = lo;
482  if(map & 2) out[1] = hi; else out[1] = lo;
483  if(map & 4) out[2] = hi; else out[2] = lo;
484  if(map & 8) out[3] = hi; else out[3] = lo;
485  map >>= 4;
486  out += stride;
487  }
488  blk++;
489  }
490  break;
491  case SMK_BLK_FULL:
492  mode = 0;
493  if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
494  if(get_bits1(&gb)) mode = 1;
495  else if(get_bits1(&gb)) mode = 2;
496  }
497  while(run-- && blk < blocks){
498  out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
499  switch(mode){
500  case 0:
501  for(i = 0; i < 4; i++) {
502  pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
503  AV_WL16(out+2,pix);
504  pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
505  AV_WL16(out,pix);
506  out += stride;
507  }
508  break;
509  case 1:
510  pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
511  out[0] = out[1] = pix & 0xFF;
512  out[2] = out[3] = pix >> 8;
513  out += stride;
514  out[0] = out[1] = pix & 0xFF;
515  out[2] = out[3] = pix >> 8;
516  out += stride;
517  pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
518  out[0] = out[1] = pix & 0xFF;
519  out[2] = out[3] = pix >> 8;
520  out += stride;
521  out[0] = out[1] = pix & 0xFF;
522  out[2] = out[3] = pix >> 8;
523  break;
524  case 2:
525  for(i = 0; i < 2; i++) {
526  uint16_t pix1, pix2;
527  pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
528  pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
529  AV_WL16(out,pix1);
530  AV_WL16(out+2,pix2);
531  out += stride;
532  AV_WL16(out,pix1);
533  AV_WL16(out+2,pix2);
534  out += stride;
535  }
536  break;
537  }
538  blk++;
539  }
540  break;
541  case SMK_BLK_SKIP:
542  while(run-- && blk < blocks)
543  blk++;
544  break;
545  case SMK_BLK_FILL:
546  mode = type >> 8;
547  while(run-- && blk < blocks){
548  uint32_t col;
549  out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
550  col = mode * 0x01010101U;
551  for(i = 0; i < 4; i++) {
552  *((uint32_t*)out) = col;
553  out += stride;
554  }
555  blk++;
556  }
557  break;
558  }
559 
560  }
561 
562  if ((ret = av_frame_ref(data, smk->pic)) < 0)
563  return ret;
564 
565  *got_frame = 1;
566 
567  /* always report that the buffer was completely consumed */
568  return avpkt->size;
569 }
570 
571 
573 {
574  SmackVContext * const smk = avctx->priv_data;
575 
576  av_freep(&smk->mmap_tbl);
577  av_freep(&smk->mclr_tbl);
578  av_freep(&smk->full_tbl);
579  av_freep(&smk->type_tbl);
580 
581  av_frame_free(&smk->pic);
582 
583  return 0;
584 }
585 
586 
588 {
589  SmackVContext * const c = avctx->priv_data;
590  int ret;
591 
592  c->avctx = avctx;
593 
594  avctx->pix_fmt = AV_PIX_FMT_PAL8;
595 
596  c->pic = av_frame_alloc();
597  if (!c->pic)
598  return AVERROR(ENOMEM);
599 
600  /* decode huffman trees from extradata */
601  if(avctx->extradata_size < 16){
602  av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
603  decode_end(avctx);
604  return AVERROR(EINVAL);
605  }
606 
607  ret = decode_header_trees(c);
608  if (ret < 0) {
609  decode_end(avctx);
610  return ret;
611  }
612 
613  return 0;
614 }
615 
616 
618 {
619  if (avctx->channels < 1 || avctx->channels > 2) {
620  av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
621  return AVERROR_INVALIDDATA;
622  }
625 
626  return 0;
627 }
628 
629 /**
630  * Decode Smacker audio data
631  */
633  int *got_frame_ptr, AVPacket *avpkt)
634 {
635  AVFrame *frame = data;
636  const uint8_t *buf = avpkt->data;
637  int buf_size = avpkt->size;
638  GetBitContext gb;
639  HuffContext h[4] = { { 0 } };
640  VLC vlc[4] = { { 0 } };
641  int16_t *samples;
642  uint8_t *samples8;
643  int val;
644  int i, res, ret;
645  int unp_size;
646  int bits, stereo;
647  int pred[2] = {0, 0};
648 
649  if (buf_size <= 4) {
650  av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
651  return AVERROR_INVALIDDATA;
652  }
653 
654  unp_size = AV_RL32(buf);
655 
656  if (unp_size > (1U<<24)) {
657  av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
658  return AVERROR_INVALIDDATA;
659  }
660 
661  if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)
662  return ret;
663 
664  if(!get_bits1(&gb)){
665  av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
666  *got_frame_ptr = 0;
667  return 1;
668  }
669  stereo = get_bits1(&gb);
670  bits = get_bits1(&gb);
671  if (stereo ^ (avctx->channels != 1)) {
672  av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
673  return AVERROR_INVALIDDATA;
674  }
675  if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {
676  av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
677  return AVERROR_INVALIDDATA;
678  }
679 
680  /* get output buffer */
681  frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
682  if (unp_size % (avctx->channels * (bits + 1))) {
683  av_log(avctx, AV_LOG_ERROR,
684  "The buffer does not contain an integer number of samples\n");
685  return AVERROR_INVALIDDATA;
686  }
687  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
688  return ret;
689  samples = (int16_t *)frame->data[0];
690  samples8 = frame->data[0];
691 
692  // Initialize
693  for(i = 0; i < (1 << (bits + stereo)); i++) {
694  h[i].length = 256;
695  h[i].maxlength = 0;
696  h[i].current = 0;
697  h[i].bits = av_mallocz(256 * 4);
698  h[i].lengths = av_mallocz(256 * sizeof(int));
699  h[i].values = av_mallocz(256 * sizeof(int));
700  if (!h[i].bits || !h[i].lengths || !h[i].values) {
701  ret = AVERROR(ENOMEM);
702  goto error;
703  }
704  skip_bits1(&gb);
705  if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) {
706  ret = AVERROR_INVALIDDATA;
707  goto error;
708  }
709  skip_bits1(&gb);
710  if(h[i].current > 1) {
711  res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
712  h[i].lengths, sizeof(int), sizeof(int),
713  h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
714  if(res < 0) {
715  av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
716  ret = AVERROR_INVALIDDATA;
717  goto error;
718  }
719  }
720  }
721  /* this codec relies on wraparound instead of clipping audio */
722  if(bits) { //decode 16-bit data
723  for(i = stereo; i >= 0; i--)
724  pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
725  for(i = 0; i <= stereo; i++)
726  *samples++ = pred[i];
727  for(; i < unp_size / 2; i++) {
728  if (get_bits_left(&gb) < 0) {
729  ret = AVERROR_INVALIDDATA;
730  goto error;
731  }
732  if(i & stereo) {
733  if(vlc[2].table)
734  res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
735  else
736  res = 0;
737  if (res < 0) {
738  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
739  ret = AVERROR_INVALIDDATA;
740  goto error;
741  }
742  val = h[2].values[res];
743  if(vlc[3].table)
744  res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
745  else
746  res = 0;
747  if (res < 0) {
748  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
749  ret = AVERROR_INVALIDDATA;
750  goto error;
751  }
752  val |= h[3].values[res] << 8;
753  pred[1] += (unsigned)sign_extend(val, 16);
754  *samples++ = pred[1];
755  } else {
756  if(vlc[0].table)
757  res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
758  else
759  res = 0;
760  if (res < 0) {
761  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
762  ret = AVERROR_INVALIDDATA;
763  goto error;
764  }
765  val = h[0].values[res];
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  ret = AVERROR_INVALIDDATA;
773  goto error;
774  }
775  val |= h[1].values[res] << 8;
776  pred[0] += (unsigned)sign_extend(val, 16);
777  *samples++ = pred[0];
778  }
779  }
780  } else { //8-bit data
781  for(i = stereo; i >= 0; i--)
782  pred[i] = get_bits(&gb, 8);
783  for(i = 0; i <= stereo; i++)
784  *samples8++ = pred[i];
785  for(; i < unp_size; i++) {
786  if (get_bits_left(&gb) < 0) {
787  ret = AVERROR_INVALIDDATA;
788  goto error;
789  }
790  if(i & stereo){
791  if(vlc[1].table)
792  res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
793  else
794  res = 0;
795  if (res < 0) {
796  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
797  ret = AVERROR_INVALIDDATA;
798  goto error;
799  }
800  pred[1] += sign_extend(h[1].values[res], 8);
801  *samples8++ = pred[1];
802  } else {
803  if(vlc[0].table)
804  res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
805  else
806  res = 0;
807  if (res < 0) {
808  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
809  ret = AVERROR_INVALIDDATA;
810  goto error;
811  }
812  pred[0] += sign_extend(h[0].values[res], 8);
813  *samples8++ = pred[0];
814  }
815  }
816  }
817 
818  *got_frame_ptr = 1;
819  ret = buf_size;
820 
821 error:
822  for(i = 0; i < 4; i++) {
823  if(vlc[i].table)
824  ff_free_vlc(&vlc[i]);
825  av_free(h[i].bits);
826  av_free(h[i].lengths);
827  av_free(h[i].values);
828  }
829 
830  return ret;
831 }
832 
834  .name = "smackvid",
835  .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
836  .type = AVMEDIA_TYPE_VIDEO,
838  .priv_data_size = sizeof(SmackVContext),
839  .init = decode_init,
840  .close = decode_end,
841  .decode = decode_frame,
842  .capabilities = AV_CODEC_CAP_DR1,
843 };
844 
846  .name = "smackaud",
847  .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
848  .type = AVMEDIA_TYPE_AUDIO,
850  .init = smka_decode_init,
851  .decode = smka_decode_frame,
852  .capabilities = AV_CODEC_CAP_DR1,
853 };
static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx, int length)
Decode header tree.
Definition: smacker.c:135
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: smacker.c:417
int type_last[3]
Definition: smacker.c:54
#define NULL
Definition: coverity.c:32
#define SMK_NODE
Definition: smacker.c:44
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
int size
This structure describes decoded (raw) audio or video data.
Definition: frame.h:300
int lcur
Definition: smacker.c:75
static const int block_runs[64]
Definition: smacker.c:79
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:379
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int current
Definition: smacker.c:63
int length
Definition: smacker.c:61
int * recode1
Definition: smacker.c:72
int * recode2
Definition: smacker.c:72
int size
Definition: packet.h:356
#define av_bswap16
Definition: bswap.h:31
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:736
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
uint8_t run
Definition: svq3.c:208
#define AV_CH_LAYOUT_STEREO
static void error(const char *err)
#define init_vlc(vlc, nb_bits, nb_codes, bits, bits_wrap, bits_size, codes, codes_wrap, codes_size, flags)
Definition: vlc.h:38
#define blk(i)
Definition: sha.c:185
static av_cold int decode_init(AVCodecContext *avctx)
Definition: smacker.c:587
int stride
Definition: mace.c:144
AVCodec.
Definition: codec.h:190
static void decode(AVCodecContext *dec_ctx, AVPacket *pkt, AVFrame *frame, FILE *outfile)
Definition: decode_audio.c:71
int escapes[3]
Definition: smacker.c:73
VLC * v2
Definition: smacker.c:71
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:1194
uint8_t
#define av_cold
Definition: attributes.h:88
#define av_malloc(s)
AV_SAMPLE_FMT_U8
AVFrame * av_frame_alloc(void)
Allocate an AVFrame and set its fields to default values.
Definition: frame.c:190
VLC * v1
Definition: smacker.c:71
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:77
int av_frame_ref(AVFrame *dst, const AVFrame *src)
Set up a new reference to the data described by the source frame.
Definition: frame.c:444
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:627
static av_cold int smka_decode_init(AVCodecContext *avctx)
Definition: smacker.c:617
static AVFrame * frame
Definition: smacker.c:70
const char data[16]
Definition: mxf.c:91
uint8_t * data
Definition: packet.h:355
int maxlength
Definition: smacker.c:62
bitstream reader API header.
#define SMKTREE_DECODE_BIG_MAX_RECURSION
Definition: smacker.c:47
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:1750
#define av_log(a,...)
static const uint16_t table[]
Definition: prosumer.c:206
int * type_tbl
Definition: smacker.c:53
int full_last[3]
Definition: smacker.c:54
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:849
#define i(width, name, range_min, range_max)
Definition: cbs_h2645.c:269
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodec ff_smacker_decoder
Definition: smacker.c:833
#define SMKTREE_DECODE_MAX_RECURSION
Definition: smacker.c:46
#define AVERROR(e)
Definition: error.h:43
SmkBlockTypes
Definition: smacker.c:89
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:203
static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
Decode local frame tree.
Definition: smacker.c:98
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:186
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Identical in function to ff_get_buffer(), except it reuses the existing buffer if available...
Definition: decode.c:1960
const char * r
Definition: vf_curves.c:114
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:239
const char * name
Name of the codec implementation.
Definition: codec.h:197
uint8_t bits
Definition: vp3data.h:202
AVFrame * pic
Definition: smacker.c:51
int * mmap_tbl
Definition: smacker.c:53
Definition: vlc.h:26
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:1237
static int smka_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode Smacker audio data.
Definition: smacker.c:632
audio channel layout utility functions
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:383
int mmap_last[3]
Definition: smacker.c:54
int width
picture width / height.
Definition: avcodec.h:699
Context used for code reconstructing.
Definition: smacker.c:60
AVFormatContext * ctx
Definition: movenc.c:48
static av_cold int decode_end(AVCodecContext *avctx)
Definition: smacker.c:572
static av_always_inline int get_vlc2(GetBitContext *s, VLC_TYPE(*table)[2], int bits, int max_depth)
Parse a vlc code.
Definition: get_bits.h:797
#define AV_RL32
Definition: intreadwrite.h:146
int * mclr_tbl
Definition: smacker.c:53
#define INIT_VLC_LE
Definition: vlc.h:54
static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
Store large tree as FFmpeg&#39;s vlc codes.
Definition: smacker.c:187
static const float pred[4]
Definition: siprdata.h:259
int * full_tbl
Definition: smacker.c:53
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
Libavcodec external API header.
AVCodec ff_smackaud_decoder
Definition: smacker.c:845
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:331
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:677
main external API structure.
Definition: avcodec.h:526
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> (&#39;D&#39;<<24) + (&#39;C&#39;<<16) + (&#39;B&#39;<<8) + &#39;A&#39;).
Definition: avcodec.h:551
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: decode.c:1854
int extradata_size
Definition: avcodec.h:628
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:498
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:538
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:457
cl_device_type type
const VDPAUPixFmtMap * map
int * last
Definition: smacker.c:74
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:130
#define flags(name, subs,...)
Definition: cbs_av1.c:564
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:314
int * lengths
Definition: smacker.c:65
AVCodecContext * avctx
Definition: smacker.c:50
common internal api header.
uint32_t * bits
Definition: smacker.c:64
signed 16 bits
Definition: samplefmt.h:61
static double c[64]
#define AV_WL16(p, v)
Definition: intreadwrite.h:412
static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last)
Definition: smacker.c:396
#define SMKTREE_BITS
Definition: smacker.c:43
void * priv_data
Definition: avcodec.h:553
#define av_free(p)
int channels
number of audio channels
Definition: avcodec.h:1187
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:378
int mclr_last[3]
Definition: smacker.c:54
int * values
Definition: smacker.c:66
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define av_always_inline
Definition: attributes.h:45
static int decode_header_trees(SmackVContext *smk)
Definition: smacker.c:319
static av_always_inline void last_reset(int *recode, int *last)
Definition: smacker.c:391
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:406
static double val(void *priv, double ch)
Definition: aeval.c:76
This structure stores compressed data.
Definition: packet.h:332
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:359
mode
Use these values in ebur128_init (or&#39;ed).
Definition: ebur128.h:83
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:366
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: codec.h:50
Predicted.
Definition: avutil.h:275
void * av_mallocz_array(size_t nmemb, size_t size)
Allocate a memory block for an array with av_mallocz().
Definition: mem.c:192