FFmpeg
 All Data Structures Namespaces Files Functions Variables Typedefs Enumerations Enumerator Macros Groups Pages
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 
47 typedef struct SmackVContext {
50 
52  int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
54 
55 /**
56  * Context used for code reconstructing
57  */
58 typedef struct HuffContext {
59  int length;
60  int maxlength;
61  int current;
62  uint32_t *bits;
63  int *lengths;
64  int *values;
65 } HuffContext;
66 
67 /* common parameters used for decode_bigtree */
68 typedef struct DBCtx {
69  VLC *v1, *v2;
70  int *recode1, *recode2;
71  int escapes[3];
72  int *last;
73  int lcur;
74 } DBCtx;
75 
76 /* possible runs of blocks */
77 static const int block_runs[64] = {
78  1, 2, 3, 4, 5, 6, 7, 8,
79  9, 10, 11, 12, 13, 14, 15, 16,
80  17, 18, 19, 20, 21, 22, 23, 24,
81  25, 26, 27, 28, 29, 30, 31, 32,
82  33, 34, 35, 36, 37, 38, 39, 40,
83  41, 42, 43, 44, 45, 46, 47, 48,
84  49, 50, 51, 52, 53, 54, 55, 56,
85  57, 58, 59, 128, 256, 512, 1024, 2048 };
86 
91  SMK_BLK_FILL = 3 };
92 
93 /**
94  * Decode local frame tree
95  */
96 static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
97 {
98  if(length > 32 || length > 3*SMKTREE_BITS) {
99  av_log(NULL, AV_LOG_ERROR, "length too long\n");
100  return AVERROR_INVALIDDATA;
101  }
102  if(!get_bits1(gb)){ //Leaf
103  if(hc->current >= hc->length){
104  av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
105  return AVERROR_INVALIDDATA;
106  }
107  if(length){
108  hc->bits[hc->current] = prefix;
109  hc->lengths[hc->current] = length;
110  } else {
111  hc->bits[hc->current] = 0;
112  hc->lengths[hc->current] = 0;
113  }
114  hc->values[hc->current] = get_bits(gb, 8);
115  hc->current++;
116  if(hc->maxlength < length)
117  hc->maxlength = length;
118  return 0;
119  } else { //Node
120  int r;
121  length++;
122  r = smacker_decode_tree(gb, hc, prefix, length);
123  if(r)
124  return r;
125  return smacker_decode_tree(gb, hc, prefix | (1 << (length - 1)), length);
126  }
127 }
128 
129 /**
130  * Decode header tree
131  */
133 {
134  if (hc->current + 1 >= hc->length) {
135  av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
136  return AVERROR_INVALIDDATA;
137  }
138  if(!get_bits1(gb)){ //Leaf
139  int val, i1, i2;
140  i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3) : 0;
141  i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3) : 0;
142  if (i1 < 0 || i2 < 0)
143  return AVERROR_INVALIDDATA;
144  val = ctx->recode1[i1] | (ctx->recode2[i2] << 8);
145  if(val == ctx->escapes[0]) {
146  ctx->last[0] = hc->current;
147  val = 0;
148  } else if(val == ctx->escapes[1]) {
149  ctx->last[1] = hc->current;
150  val = 0;
151  } else if(val == ctx->escapes[2]) {
152  ctx->last[2] = hc->current;
153  val = 0;
154  }
155 
156  hc->values[hc->current++] = val;
157  return 1;
158  } else { //Node
159  int r = 0, r_new, t;
160 
161  t = hc->current++;
162  r = smacker_decode_bigtree(gb, hc, ctx);
163  if(r < 0)
164  return r;
165  hc->values[t] = SMK_NODE | r;
166  r++;
167  r_new = smacker_decode_bigtree(gb, hc, ctx);
168  if (r_new < 0)
169  return r_new;
170  return r + r_new;
171  }
172 }
173 
174 /**
175  * Store large tree as FFmpeg's vlc codes
176  */
177 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
178 {
179  int res;
180  HuffContext huff;
181  HuffContext tmp1, tmp2;
182  VLC vlc[2] = { { 0 } };
183  int escapes[3];
184  DBCtx ctx;
185  int err = 0;
186 
187  if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
188  av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
189  return AVERROR_INVALIDDATA;
190  }
191 
192  tmp1.length = 256;
193  tmp1.maxlength = 0;
194  tmp1.current = 0;
195  tmp1.bits = av_mallocz(256 * 4);
196  tmp1.lengths = av_mallocz(256 * sizeof(int));
197  tmp1.values = av_mallocz(256 * sizeof(int));
198 
199  tmp2.length = 256;
200  tmp2.maxlength = 0;
201  tmp2.current = 0;
202  tmp2.bits = av_mallocz(256 * 4);
203  tmp2.lengths = av_mallocz(256 * sizeof(int));
204  tmp2.values = av_mallocz(256 * sizeof(int));
205  if (!tmp1.bits || !tmp1.lengths || !tmp1.values ||
206  !tmp2.bits || !tmp2.lengths || !tmp2.values) {
207  err = AVERROR(ENOMEM);
208  goto error;
209  }
210 
211  if(get_bits1(gb)) {
212  res = smacker_decode_tree(gb, &tmp1, 0, 0);
213  if (res < 0) {
214  err = res;
215  goto error;
216  }
217  skip_bits1(gb);
218  if(tmp1.current > 1) {
219  res = init_vlc(&vlc[0], SMKTREE_BITS, tmp1.length,
220  tmp1.lengths, sizeof(int), sizeof(int),
221  tmp1.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  err = res;
225  goto error;
226  }
227  }
228  }
229  if (!vlc[0].table) {
230  av_log(smk->avctx, AV_LOG_ERROR, "Skipping low bytes tree\n");
231  }
232  if(get_bits1(gb)){
233  res = smacker_decode_tree(gb, &tmp2, 0, 0);
234  if (res < 0) {
235  err = res;
236  goto error;
237  }
238  skip_bits1(gb);
239  if(tmp2.current > 1) {
240  res = init_vlc(&vlc[1], SMKTREE_BITS, tmp2.length,
241  tmp2.lengths, sizeof(int), sizeof(int),
242  tmp2.bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
243  if(res < 0) {
244  av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
245  err = res;
246  goto error;
247  }
248  }
249  }
250  if (!vlc[1].table) {
251  av_log(smk->avctx, AV_LOG_ERROR, "Skipping high bytes tree\n");
252  }
253 
254  escapes[0] = get_bits(gb, 16);
255  escapes[1] = get_bits(gb, 16);
256  escapes[2] = get_bits(gb, 16);
257 
258  last[0] = last[1] = last[2] = -1;
259 
260  ctx.escapes[0] = escapes[0];
261  ctx.escapes[1] = escapes[1];
262  ctx.escapes[2] = escapes[2];
263  ctx.v1 = &vlc[0];
264  ctx.v2 = &vlc[1];
265  ctx.recode1 = tmp1.values;
266  ctx.recode2 = tmp2.values;
267  ctx.last = last;
268 
269  huff.length = ((size + 3) >> 2) + 4;
270  huff.maxlength = 0;
271  huff.current = 0;
272  huff.values = av_mallocz_array(huff.length, sizeof(int));
273  if (!huff.values) {
274  err = AVERROR(ENOMEM);
275  goto error;
276  }
277 
278  if (smacker_decode_bigtree(gb, &huff, &ctx) < 0)
279  err = -1;
280  skip_bits1(gb);
281  if(ctx.last[0] == -1) ctx.last[0] = huff.current++;
282  if(ctx.last[1] == -1) ctx.last[1] = huff.current++;
283  if(ctx.last[2] == -1) ctx.last[2] = huff.current++;
284  if (ctx.last[0] >= huff.length ||
285  ctx.last[1] >= huff.length ||
286  ctx.last[2] >= huff.length) {
287  av_log(smk->avctx, AV_LOG_ERROR, "Huffman codes out of range\n");
288  err = AVERROR_INVALIDDATA;
289  }
290 
291  *recodes = huff.values;
292 
293 error:
294  if(vlc[0].table)
295  ff_free_vlc(&vlc[0]);
296  if(vlc[1].table)
297  ff_free_vlc(&vlc[1]);
298  av_free(tmp1.bits);
299  av_free(tmp1.lengths);
300  av_free(tmp1.values);
301  av_free(tmp2.bits);
302  av_free(tmp2.lengths);
303  av_free(tmp2.values);
304 
305  return err;
306 }
307 
309  GetBitContext gb;
310  int mmap_size, mclr_size, full_size, type_size, ret;
311 
312  mmap_size = AV_RL32(smk->avctx->extradata);
313  mclr_size = AV_RL32(smk->avctx->extradata + 4);
314  full_size = AV_RL32(smk->avctx->extradata + 8);
315  type_size = AV_RL32(smk->avctx->extradata + 12);
316 
317  ret = init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
318  if (ret < 0)
319  return ret;
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 
373 static 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 */
378 static 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 
397 static 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)
424  else
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 
551 {
552  SmackVContext * const smk = avctx->priv_data;
553 
554  av_freep(&smk->mmap_tbl);
555  av_freep(&smk->mclr_tbl);
556  av_freep(&smk->full_tbl);
557  av_freep(&smk->type_tbl);
558 
559  av_frame_free(&smk->pic);
560 
561  return 0;
562 }
563 
564 
566 {
567  SmackVContext * const c = avctx->priv_data;
568  int ret;
569 
570  c->avctx = avctx;
571 
572  avctx->pix_fmt = AV_PIX_FMT_PAL8;
573 
574  c->pic = av_frame_alloc();
575  if (!c->pic)
576  return AVERROR(ENOMEM);
577 
578  /* decode huffman trees from extradata */
579  if(avctx->extradata_size < 16){
580  av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
581  decode_end(avctx);
582  return AVERROR(EINVAL);
583  }
584 
585  ret = decode_header_trees(c);
586  if (ret < 0) {
587  decode_end(avctx);
588  return ret;
589  }
590 
591  return 0;
592 }
593 
594 
596 {
597  if (avctx->channels < 1 || avctx->channels > 2) {
598  av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
599  return AVERROR(EINVAL);
600  }
603 
604  return 0;
605 }
606 
607 /**
608  * Decode Smacker audio data
609  */
610 static int smka_decode_frame(AVCodecContext *avctx, void *data,
611  int *got_frame_ptr, AVPacket *avpkt)
612 {
613  AVFrame *frame = data;
614  const uint8_t *buf = avpkt->data;
615  int buf_size = avpkt->size;
616  GetBitContext gb;
617  HuffContext h[4] = { { 0 } };
618  VLC vlc[4] = { { 0 } };
619  int16_t *samples;
620  uint8_t *samples8;
621  int val;
622  int i, res, ret;
623  int unp_size;
624  int bits, stereo;
625  int pred[2] = {0, 0};
626 
627  if (buf_size <= 4) {
628  av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
629  return AVERROR(EINVAL);
630  }
631 
632  unp_size = AV_RL32(buf);
633 
634  if (unp_size > (1U<<24)) {
635  av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
636  return AVERROR_INVALIDDATA;
637  }
638 
639  if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)
640  return ret;
641 
642  if(!get_bits1(&gb)){
643  av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
644  *got_frame_ptr = 0;
645  return 1;
646  }
647  stereo = get_bits1(&gb);
648  bits = get_bits1(&gb);
649  if (stereo ^ (avctx->channels != 1)) {
650  av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
651  return AVERROR(EINVAL);
652  }
653  if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {
654  av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
655  return AVERROR(EINVAL);
656  }
657 
658  /* get output buffer */
659  frame->nb_samples = unp_size / (avctx->channels * (bits + 1));
660  if (unp_size % (avctx->channels * (bits + 1))) {
661  av_log(avctx, AV_LOG_ERROR, "unp_size %d is odd\n", unp_size);
662  return AVERROR(EINVAL);
663  }
664  if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
665  return ret;
666  samples = (int16_t *)frame->data[0];
667  samples8 = frame->data[0];
668 
669  // Initialize
670  for(i = 0; i < (1 << (bits + stereo)); i++) {
671  h[i].length = 256;
672  h[i].maxlength = 0;
673  h[i].current = 0;
674  h[i].bits = av_mallocz(256 * 4);
675  h[i].lengths = av_mallocz(256 * sizeof(int));
676  h[i].values = av_mallocz(256 * sizeof(int));
677  if (!h[i].bits || !h[i].lengths || !h[i].values) {
678  ret = AVERROR(ENOMEM);
679  goto error;
680  }
681  skip_bits1(&gb);
682  if (smacker_decode_tree(&gb, &h[i], 0, 0) < 0) {
683  ret = AVERROR_INVALIDDATA;
684  goto error;
685  }
686  skip_bits1(&gb);
687  if(h[i].current > 1) {
688  res = init_vlc(&vlc[i], SMKTREE_BITS, h[i].length,
689  h[i].lengths, sizeof(int), sizeof(int),
690  h[i].bits, sizeof(uint32_t), sizeof(uint32_t), INIT_VLC_LE);
691  if(res < 0) {
692  av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
693  ret = AVERROR_INVALIDDATA;
694  goto error;
695  }
696  }
697  }
698  /* this codec relies on wraparound instead of clipping audio */
699  if(bits) { //decode 16-bit data
700  for(i = stereo; i >= 0; i--)
701  pred[i] = sign_extend(av_bswap16(get_bits(&gb, 16)), 16);
702  for(i = 0; i <= stereo; i++)
703  *samples++ = pred[i];
704  for(; i < unp_size / 2; i++) {
705  if(get_bits_left(&gb)<0)
706  return AVERROR_INVALIDDATA;
707  if(i & stereo) {
708  if(vlc[2].table)
709  res = get_vlc2(&gb, vlc[2].table, SMKTREE_BITS, 3);
710  else
711  res = 0;
712  if (res < 0) {
713  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
714  return AVERROR_INVALIDDATA;
715  }
716  val = h[2].values[res];
717  if(vlc[3].table)
718  res = get_vlc2(&gb, vlc[3].table, SMKTREE_BITS, 3);
719  else
720  res = 0;
721  if (res < 0) {
722  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
723  return AVERROR_INVALIDDATA;
724  }
725  val |= h[3].values[res] << 8;
726  pred[1] += sign_extend(val, 16);
727  *samples++ = pred[1];
728  } else {
729  if(vlc[0].table)
730  res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
731  else
732  res = 0;
733  if (res < 0) {
734  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
735  return AVERROR_INVALIDDATA;
736  }
737  val = h[0].values[res];
738  if(vlc[1].table)
739  res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
740  else
741  res = 0;
742  if (res < 0) {
743  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
744  return AVERROR_INVALIDDATA;
745  }
746  val |= h[1].values[res] << 8;
747  pred[0] += sign_extend(val, 16);
748  *samples++ = pred[0];
749  }
750  }
751  } else { //8-bit data
752  for(i = stereo; i >= 0; i--)
753  pred[i] = get_bits(&gb, 8);
754  for(i = 0; i <= stereo; i++)
755  *samples8++ = pred[i];
756  for(; i < unp_size; i++) {
757  if(get_bits_left(&gb)<0)
758  return AVERROR_INVALIDDATA;
759  if(i & stereo){
760  if(vlc[1].table)
761  res = get_vlc2(&gb, vlc[1].table, SMKTREE_BITS, 3);
762  else
763  res = 0;
764  if (res < 0) {
765  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
766  return AVERROR_INVALIDDATA;
767  }
768  pred[1] += sign_extend(h[1].values[res], 8);
769  *samples8++ = pred[1];
770  } else {
771  if(vlc[0].table)
772  res = get_vlc2(&gb, vlc[0].table, SMKTREE_BITS, 3);
773  else
774  res = 0;
775  if (res < 0) {
776  av_log(avctx, AV_LOG_ERROR, "invalid vlc\n");
777  return AVERROR_INVALIDDATA;
778  }
779  pred[0] += sign_extend(h[0].values[res], 8);
780  *samples8++ = pred[0];
781  }
782  }
783  }
784 
785  *got_frame_ptr = 1;
786  ret = buf_size;
787 
788 error:
789  for(i = 0; i < 4; i++) {
790  if(vlc[i].table)
791  ff_free_vlc(&vlc[i]);
792  av_free(h[i].bits);
793  av_free(h[i].lengths);
794  av_free(h[i].values);
795  }
796 
797  return ret;
798 }
799 
801  .name = "smackvid",
802  .long_name = NULL_IF_CONFIG_SMALL("Smacker video"),
803  .type = AVMEDIA_TYPE_VIDEO,
805  .priv_data_size = sizeof(SmackVContext),
806  .init = decode_init,
807  .close = decode_end,
808  .decode = decode_frame,
809  .capabilities = AV_CODEC_CAP_DR1,
810 };
811 
813  .name = "smackaud",
814  .long_name = NULL_IF_CONFIG_SMALL("Smacker audio"),
815  .type = AVMEDIA_TYPE_AUDIO,
817  .init = smka_decode_init,
818  .decode = smka_decode_frame,
819  .capabilities = AV_CODEC_CAP_DR1,
820 };
static int decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt)
Definition: smacker.c:397
int type_last[3]
Definition: smacker.c:52
#define NULL
Definition: coverity.c:32
const char const char void * val
Definition: avisynth_c.h:771
#define SMK_NODE
Definition: smacker.c:44
#define AVERROR_INVALIDDATA
Invalid data found when processing input.
Definition: error.h:59
This structure describes decoded (raw) audio or video data.
Definition: frame.h:184
ptrdiff_t const GLvoid * data
Definition: opengl_enc.c:101
int lcur
Definition: smacker.c:73
static const int block_runs[64]
Definition: smacker.c:77
static unsigned int get_bits(GetBitContext *s, int n)
Read 1-25 bits.
Definition: get_bits.h:247
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int current
Definition: smacker.c:61
int length
Definition: smacker.c:59
int * recode1
Definition: smacker.c:70
int * recode2
Definition: smacker.c:70
int size
Definition: avcodec.h:1591
#define av_bswap16
Definition: bswap.h:31
enum AVPixelFormat pix_fmt
Pixel format, see AV_PIX_FMT_xxx.
Definition: avcodec.h:1887
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:133
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:252
uint8_t run
Definition: svq3.c:205
#define AV_CH_LAYOUT_STEREO
#define blk(i)
Definition: sha.c:185
static av_cold int decode_init(AVCodecContext *avctx)
Definition: smacker.c:565
AVCodec.
Definition: avcodec.h:3573
int escapes[3]
Definition: smacker.c:71
VLC * v2
Definition: smacker.c:69
uint8_t bits
Definition: crc.c:296
enum AVSampleFormat sample_fmt
audio sample format
Definition: avcodec.h:2429
uint8_t
#define av_cold
Definition: attributes.h:82
#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:140
VLC * v1
Definition: smacker.c:69
8 bits with AV_PIX_FMT_RGB32 palette
Definition: pixfmt.h:73
mode
Definition: f_perms.c:27
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:374
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1774
static av_cold int smka_decode_init(AVCodecContext *avctx)
Definition: smacker.c:595
static AVFrame * frame
Definition: smacker.c:68
uint8_t * data
Definition: avcodec.h:1590
int maxlength
Definition: smacker.c:60
bitstream reader API header.
ptrdiff_t size
Definition: opengl_enc.c:101
int bits_per_coded_sample
bits per sample/pixel from the demuxer (needed for huffyuv).
Definition: avcodec.h:3053
#define av_log(a,...)
int * type_tbl
Definition: smacker.c:51
int full_last[3]
Definition: smacker.c:52
#define U(x)
Definition: vp56_arith.h:37
static int get_bits_left(GetBitContext *gb)
Definition: get_bits.h:568
#define AV_LOG_ERROR
Something went wrong and cannot losslessly be recovered.
Definition: log.h:176
AVCodec ff_smacker_decoder
Definition: smacker.c:800
#define init_vlc(vlc, nb_bits, nb_codes,bits, bits_wrap, bits_size,codes, codes_wrap, codes_size,flags)
Definition: vlc.h:38
#define AVERROR(e)
Definition: error.h:43
SmkBlockTypes
Definition: smacker.c:87
void av_frame_free(AVFrame **frame)
Free the frame and any dynamically allocated objects in it, e.g.
Definition: frame.c:153
static const struct endianess table[]
static int smacker_decode_tree(GetBitContext *gb, HuffContext *hc, uint32_t prefix, int length)
Decode local frame tree.
Definition: smacker.c:96
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:176
const char * r
Definition: vf_curves.c:111
GLsizei GLsizei * length
Definition: opengl_enc.c:115
const char * name
Name of the codec implementation.
Definition: avcodec.h:3580
AVFrame * pic
Definition: smacker.c:49
int * mmap_tbl
Definition: smacker.c:51
static void * av_mallocz_array(size_t nmemb, size_t size)
Definition: mem.h:226
Definition: vlc.h:26
uint64_t channel_layout
Audio channel layout.
Definition: avcodec.h:2472
static int smka_decode_frame(AVCodecContext *avctx, void *data, int *got_frame_ptr, AVPacket *avpkt)
Decode Smacker audio data.
Definition: smacker.c:610
int ff_reget_buffer(AVCodecContext *avctx, AVFrame *frame)
Identical in function to av_frame_make_writable(), except it uses ff_get_buffer() to allocate the buf...
Definition: utils.c:977
audio channel layout utility functions
enum AVPictureType pict_type
Picture type of the frame.
Definition: frame.h:258
int mmap_last[3]
Definition: smacker.c:52
int width
picture width / height.
Definition: avcodec.h:1846
Context used for code reconstructing.
Definition: smacker.c:58
AVFormatContext * ctx
Definition: movenc.c:48
static av_cold int decode_end(AVCodecContext *avctx)
Definition: smacker.c:550
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:535
int * mclr_tbl
Definition: smacker.c:51
#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's vlc codes.
Definition: smacker.c:177
static const float pred[4]
Definition: siprdata.h:259
int * full_tbl
Definition: smacker.c:51
#define AV_LOG_INFO
Standard information.
Definition: log.h:187
Libavcodec external API header.
AVCodec ff_smackaud_decoder
Definition: smacker.c:812
int linesize[AV_NUM_DATA_POINTERS]
For video, size in bytes of each picture line.
Definition: frame.h:215
static int init_get_bits8(GetBitContext *s, const uint8_t *buffer, int byte_size)
Initialize GetBitContext.
Definition: get_bits.h:437
main external API structure.
Definition: avcodec.h:1659
int ff_get_buffer(AVCodecContext *avctx, AVFrame *frame, int flags)
Get a buffer for a frame.
Definition: utils.c:928
unsigned int codec_tag
fourcc (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
Definition: avcodec.h:1691
void * buf
Definition: avisynth_c.h:690
GLint GLenum type
Definition: opengl_enc.c:105
int extradata_size
Definition: avcodec.h:1775
static unsigned int get_bits1(GetBitContext *s)
Definition: get_bits.h:299
static void skip_bits1(GetBitContext *s)
Definition: get_bits.h:324
static int smacker_decode_bigtree(GetBitContext *gb, HuffContext *hc, DBCtx *ctx)
Decode header tree.
Definition: smacker.c:132
int palette_has_changed
Tell user application that palette has changed from previous frame.
Definition: frame.h:328
const VDPAUPixFmtMap * map
int * last
Definition: smacker.c:72
static av_const int sign_extend(int val, unsigned bits)
Definition: mathops.h:139
static int flags
Definition: cpu.c:47
uint8_t * data[AV_NUM_DATA_POINTERS]
pointer to the picture/channel planes.
Definition: frame.h:198
int * lengths
Definition: smacker.c:63
AVCodecContext * avctx
Definition: smacker.c:48
static int decode(AVCodecContext *avctx, void *data, int *got_sub, AVPacket *avpkt)
Definition: ccaption_dec.c:752
common internal api header.
uint32_t * bits
Definition: smacker.c:62
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:378
#define SMKTREE_BITS
Definition: smacker.c:43
void * priv_data
Definition: avcodec.h:1701
#define av_free(p)
int channels
number of audio channels
Definition: avcodec.h:2422
VLC_TYPE(* table)[2]
code, bits
Definition: vlc.h:28
int key_frame
1 -> keyframe, 0-> not
Definition: frame.h:253
int mclr_last[3]
Definition: smacker.c:52
int * values
Definition: smacker.c:64
FILE * out
Definition: movenc.c:54
#define av_freep(p)
#define av_always_inline
Definition: attributes.h:39
static int decode_header_trees(SmackVContext *smk)
Definition: smacker.c:308
static av_always_inline void last_reset(int *recode, int *last)
Definition: smacker.c:373
#define stride
#define AV_CH_LAYOUT_MONO
#define MKTAG(a, b, c, d)
Definition: common.h:342
uint64_t_TMPL AV_WL64 unsigned int_TMPL AV_RL32
Definition: bytestream.h:87
This structure stores compressed data.
Definition: avcodec.h:1567
void ff_free_vlc(VLC *vlc)
Definition: bitstream.c:360
int nb_samples
number of audio samples (per channel) described by this frame
Definition: frame.h:241
#define AV_CODEC_CAP_DR1
Codec uses get_buffer() for allocating buffers and supports custom allocators.
Definition: avcodec.h:958
Predicted.
Definition: avutil.h:269