FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/smacker.c
Date: 2025-03-23 22:11:24
Exec Total Coverage
Lines: 268 423 63.4%
Functions: 11 11 100.0%
Branches: 129 237 54.4%
Line Branch Exec Source
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 <stddef.h>
32
33 #include "libavutil/channel_layout.h"
34 #include "libavutil/mem.h"
35
36 #include "avcodec.h"
37
38 #define SMKTREE_BITS 9
39 #define SMK_NODE 0x80000000
40
41 #define SMKTREE_DECODE_MAX_RECURSION FFMIN(32, 3 * SMKTREE_BITS)
42 #define SMKTREE_DECODE_BIG_MAX_RECURSION 500
43
44 /* The maximum possible unchecked overread happens in decode_header_trees:
45 * Decoding the MMAP tree can overread by 6 * SMKTREE_BITS + 1, followed by
46 * three get_bits1, followed by at most 2 + 3 * 16 read bits when reading
47 * the TYPE tree before the next check. 64 is because of 64 bit reads. */
48 #if (6 * SMKTREE_BITS + 1 + 3 + (2 + 3 * 16) + 64) <= 8 * AV_INPUT_BUFFER_PADDING_SIZE
49 #define UNCHECKED_BITSTREAM_READER 1
50 #endif
51 #define BITSTREAM_READER_LE
52 #include "bytestream.h"
53 #include "codec_internal.h"
54 #include "decode.h"
55 #include "get_bits.h"
56
57 typedef struct SmackVContext {
58 AVCodecContext *avctx;
59 AVFrame *pic;
60
61 int *mmap_tbl, *mclr_tbl, *full_tbl, *type_tbl;
62 int mmap_last[3], mclr_last[3], full_last[3], type_last[3];
63 } SmackVContext;
64
65 typedef struct HuffEntry {
66 uint8_t value;
67 uint8_t length;
68 } HuffEntry;
69
70 /**
71 * Context used for code reconstructing
72 */
73 typedef struct HuffContext {
74 int current;
75 HuffEntry entries[256];
76 } HuffContext;
77
78 /* common parameters used for decode_bigtree */
79 typedef struct DBCtx {
80 int current, length;
81 int *values;
82 VLC *v1, *v2;
83 uint8_t vals[2];
84 int escapes[3];
85 int *last;
86 } DBCtx;
87
88 /* possible runs of blocks */
89 static const int block_runs[64] = {
90 1, 2, 3, 4, 5, 6, 7, 8,
91 9, 10, 11, 12, 13, 14, 15, 16,
92 17, 18, 19, 20, 21, 22, 23, 24,
93 25, 26, 27, 28, 29, 30, 31, 32,
94 33, 34, 35, 36, 37, 38, 39, 40,
95 41, 42, 43, 44, 45, 46, 47, 48,
96 49, 50, 51, 52, 53, 54, 55, 56,
97 57, 58, 59, 128, 256, 512, 1024, 2048 };
98
99 enum SmkBlockTypes {
100 SMK_BLK_MONO = 0,
101 SMK_BLK_FULL = 1,
102 SMK_BLK_SKIP = 2,
103 SMK_BLK_FILL = 3 };
104
105 /**
106 * Decode local frame tree
107 *
108 * Can read SMKTREE_DECODE_MAX_RECURSION before the first check;
109 * does not overread gb on success.
110 */
111 9904 static int smacker_decode_tree(AVCodecContext *avctx, GetBitContext *gb, HuffContext *hc, int length)
112 {
113
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 9904 if (length > SMKTREE_DECODE_MAX_RECURSION || length > 3 * SMKTREE_BITS) {
114 ✗ av_log(avctx, AV_LOG_ERROR, "Maximum tree recursion level exceeded.\n");
115 ✗ return AVERROR_INVALIDDATA;
116 }
117
118
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 9904 if(!get_bits1(gb)){ //Leaf
119
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 5007 if (hc->current >= 256) {
120 ✗ av_log(avctx, AV_LOG_ERROR, "Tree size exceeded!\n");
121 ✗ return AVERROR_INVALIDDATA;
122 }
123
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 5007 if (get_bits_left(gb) < 8)
124 ✗ return AVERROR_INVALIDDATA;
125 5007 hc->entries[hc->current++] = (HuffEntry){ get_bits(gb, 8), length };
126 5007 return 0;
127 } else { //Node
128 int r;
129 4897 length++;
130 4897 r = smacker_decode_tree(avctx, gb, hc, length);
131
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 4897 if(r)
132 ✗ return r;
133 4897 return smacker_decode_tree(avctx, gb, hc, length);
134 }
135 }
136
137 /**
138 * Decode header tree
139 *
140 * Checks before the first read, can overread by 6 * SMKTREE_BITS on success.
141 */
142 81192 static int smacker_decode_bigtree(AVCodecContext *avctx, GetBitContext *gb, DBCtx *ctx, int length)
143 {
144 // Larger length can cause segmentation faults due to too deep recursion.
145
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 81192 if (length > SMKTREE_DECODE_BIG_MAX_RECURSION) {
146 ✗ av_log(NULL, AV_LOG_ERROR, "Maximum bigtree recursion level exceeded.\n");
147 ✗ return AVERROR_INVALIDDATA;
148 }
149
150
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 81192 if (ctx->current >= ctx->length) {
151 ✗ av_log(NULL, AV_LOG_ERROR, "Tree size exceeded!\n");
152 ✗ return AVERROR_INVALIDDATA;
153 }
154
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 81192 if (get_bits_left(gb) <= 0)
155 ✗ return AVERROR_INVALIDDATA;
156
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 81192 if(!get_bits1(gb)){ //Leaf
157 int val, i1, i2;
158 40602 i1 = ctx->v1->table ? get_vlc2(gb, ctx->v1->table, SMKTREE_BITS, 3)
159
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 40602 : ctx->vals[0];
160 40602 i2 = ctx->v2->table ? get_vlc2(gb, ctx->v2->table, SMKTREE_BITS, 3)
161
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 40602 : ctx->vals[1];
162 40602 val = i1 | (i2 << 8);
163
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 40602 if(val == ctx->escapes[0]) {
164 9 ctx->last[0] = ctx->current;
165 9 val = 0;
166
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 40593 } else if(val == ctx->escapes[1]) {
167 12 ctx->last[1] = ctx->current;
168 12 val = 0;
169
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 40581 } else if(val == ctx->escapes[2]) {
170 12 ctx->last[2] = ctx->current;
171 12 val = 0;
172 }
173
174 40602 ctx->values[ctx->current++] = val;
175 40602 return 1;
176 } else { //Node
177 40590 int r = 0, r_new, t;
178
179 40590 t = ctx->current++;
180 40590 r = smacker_decode_bigtree(avctx, gb, ctx, length + 1);
181
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 40590 if(r < 0)
182 ✗ return r;
183 40590 ctx->values[t] = SMK_NODE | r;
184 40590 r++;
185 40590 r_new = smacker_decode_bigtree(avctx, gb, ctx, length + 1);
186
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 40590 if (r_new < 0)
187 ✗ return r_new;
188 40590 return r + r_new;
189 }
190 }
191
192 /**
193 * Store large tree as FFmpeg's vlc codes
194 *
195 * Can read FFMAX(1 + SMKTREE_DECODE_MAX_RECURSION, 2 + 3 * 16) bits
196 * before the first check; can overread by 6 * SMKTREE_BITS + 1 on success.
197 */
198 12 static int smacker_decode_header_tree(SmackVContext *smk, GetBitContext *gb, int **recodes, int *last, int size)
199 {
200 12 VLC vlc[2] = { { 0 } };
201 int escapes[3];
202 DBCtx ctx;
203 int err;
204
205
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 12 if(size >= UINT_MAX>>4){ // (((size + 3) >> 2) + 3) << 2 must not overflow
206 ✗ av_log(smk->avctx, AV_LOG_ERROR, "size too large\n");
207 ✗ return AVERROR_INVALIDDATA;
208 }
209
210
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 36 for (int i = 0; i < 2; i++) {
211 HuffContext h;
212 24 h.current = 0;
213
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 24 if (!get_bits1(gb)) {
214 ✗ ctx.vals[i] = 0;
215 ✗ av_log(smk->avctx, AV_LOG_ERROR, "Skipping %s bytes tree\n",
216 i ? "high" : "low");
217 ✗ continue;
218 }
219 24 err = smacker_decode_tree(smk->avctx, gb, &h, 0);
220
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 24 if (err < 0)
221 ✗ goto error;
222 24 skip_bits1(gb);
223
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 24 if (h.current > 1) {
224 24 err = ff_vlc_init_from_lengths(&vlc[i], SMKTREE_BITS, h.current,
225 &h.entries[0].length, sizeof(*h.entries),
226 &h.entries[0].value, sizeof(*h.entries), 1,
227 24 0, VLC_INIT_OUTPUT_LE, smk->avctx);
228
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 24 if (err < 0) {
229 ✗ av_log(smk->avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
230 ✗ goto error;
231 }
232 } else
233 ✗ ctx.vals[i] = h.entries[0].value;
234 }
235
236 12 escapes[0] = get_bits(gb, 16);
237 12 escapes[1] = get_bits(gb, 16);
238 12 escapes[2] = get_bits(gb, 16);
239
240 12 last[0] = last[1] = last[2] = -1;
241
242 12 ctx.escapes[0] = escapes[0];
243 12 ctx.escapes[1] = escapes[1];
244 12 ctx.escapes[2] = escapes[2];
245 12 ctx.v1 = &vlc[0];
246 12 ctx.v2 = &vlc[1];
247 12 ctx.last = last;
248 12 ctx.length = (size + 3) >> 2;
249 12 ctx.current = 0;
250 12 ctx.values = av_malloc_array(ctx.length + 3, sizeof(ctx.values[0]));
251
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 12 if (!ctx.values) {
252 ✗ err = AVERROR(ENOMEM);
253 ✗ goto error;
254 }
255 12 *recodes = ctx.values;
256
257 12 err = smacker_decode_bigtree(smk->avctx, gb, &ctx, 0);
258
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 12 if (err < 0)
259 ✗ goto error;
260 12 skip_bits1(gb);
261
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 12 if (ctx.last[0] == -1) ctx.last[0] = ctx.current++;
262
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 12 if (ctx.last[1] == -1) ctx.last[1] = ctx.current++;
263
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 12 if (ctx.last[2] == -1) ctx.last[2] = ctx.current++;
264
265 12 err = 0;
266 12 error:
267
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 36 for (int i = 0; i < 2; i++) {
268 24 ff_vlc_free(&vlc[i]);
269 }
270
271 12 return err;
272 }
273
274 3 static int decode_header_trees(SmackVContext *smk) {
275 GetBitContext gb;
276 int mmap_size, mclr_size, full_size, type_size, ret;
277 3 int skip = 0;
278
279 3 mmap_size = AV_RL32(smk->avctx->extradata);
280 3 mclr_size = AV_RL32(smk->avctx->extradata + 4);
281 3 full_size = AV_RL32(smk->avctx->extradata + 8);
282 3 type_size = AV_RL32(smk->avctx->extradata + 12);
283
284 3 ret = init_get_bits8(&gb, smk->avctx->extradata + 16, smk->avctx->extradata_size - 16);
285
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 3 if (ret < 0)
286 ✗ return ret;
287
288
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 3 if(!get_bits1(&gb)) {
289 ✗ skip ++;
290 ✗ av_log(smk->avctx, AV_LOG_INFO, "Skipping MMAP tree\n");
291 ✗ smk->mmap_tbl = av_malloc(sizeof(int) * 2);
292 ✗ if (!smk->mmap_tbl)
293 ✗ return AVERROR(ENOMEM);
294 ✗ smk->mmap_tbl[0] = 0;
295 ✗ smk->mmap_last[0] = smk->mmap_last[1] = smk->mmap_last[2] = 1;
296 } else {
297 3 ret = smacker_decode_header_tree(smk, &gb, &smk->mmap_tbl, smk->mmap_last, mmap_size);
298
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 3 if (ret < 0)
299 ✗ return ret;
300 }
301
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 3 if(!get_bits1(&gb)) {
302 ✗ skip ++;
303 ✗ av_log(smk->avctx, AV_LOG_INFO, "Skipping MCLR tree\n");
304 ✗ smk->mclr_tbl = av_malloc(sizeof(int) * 2);
305 ✗ if (!smk->mclr_tbl)
306 ✗ return AVERROR(ENOMEM);
307 ✗ smk->mclr_tbl[0] = 0;
308 ✗ smk->mclr_last[0] = smk->mclr_last[1] = smk->mclr_last[2] = 1;
309 } else {
310 3 ret = smacker_decode_header_tree(smk, &gb, &smk->mclr_tbl, smk->mclr_last, mclr_size);
311
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 3 if (ret < 0)
312 ✗ return ret;
313 }
314
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 3 if(!get_bits1(&gb)) {
315 ✗ skip ++;
316 ✗ av_log(smk->avctx, AV_LOG_INFO, "Skipping FULL tree\n");
317 ✗ smk->full_tbl = av_malloc(sizeof(int) * 2);
318 ✗ if (!smk->full_tbl)
319 ✗ return AVERROR(ENOMEM);
320 ✗ smk->full_tbl[0] = 0;
321 ✗ smk->full_last[0] = smk->full_last[1] = smk->full_last[2] = 1;
322 } else {
323 3 ret = smacker_decode_header_tree(smk, &gb, &smk->full_tbl, smk->full_last, full_size);
324
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 3 if (ret < 0)
325 ✗ return ret;
326 }
327
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 3 if(!get_bits1(&gb)) {
328 ✗ skip ++;
329 ✗ av_log(smk->avctx, AV_LOG_INFO, "Skipping TYPE tree\n");
330 ✗ smk->type_tbl = av_malloc(sizeof(int) * 2);
331 ✗ if (!smk->type_tbl)
332 ✗ return AVERROR(ENOMEM);
333 ✗ smk->type_tbl[0] = 0;
334 ✗ smk->type_last[0] = smk->type_last[1] = smk->type_last[2] = 1;
335 } else {
336 3 ret = smacker_decode_header_tree(smk, &gb, &smk->type_tbl, smk->type_last, type_size);
337
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 3 if (ret < 0)
338 ✗ return ret;
339 }
340
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 3 if (skip == 4 || get_bits_left(&gb) < 0)
341 ✗ return AVERROR_INVALIDDATA;
342
343 3 return 0;
344 }
345
346 400 static av_always_inline void last_reset(int *recode, int *last) {
347 400 recode[last[0]] = recode[last[1]] = recode[last[2]] = 0;
348 400 }
349
350 /* Get code and update history.
351 * Checks before reading, does not overread. */
352 721937 static av_always_inline int smk_get_code(GetBitContext *gb, int *recode, int *last) {
353 721937 register int *table = recode;
354 int v;
355
356
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 5893869 while(*table & SMK_NODE) {
357
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 5171932 if (get_bits_left(gb) < 1)
358 ✗ return AVERROR_INVALIDDATA;
359
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 5171932 if(get_bits1(gb))
360 2453865 table += (*table) & (~SMK_NODE);
361 5171932 table++;
362 }
363 721937 v = *table;
364
365
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 721937 if(v != recode[last[0]]) {
366 603120 recode[last[2]] = recode[last[1]];
367 603120 recode[last[1]] = recode[last[0]];
368 603120 recode[last[0]] = v;
369 }
370 721937 return v;
371 }
372
373 100 static int decode_frame(AVCodecContext *avctx, AVFrame *rframe,
374 int *got_frame, AVPacket *avpkt)
375 {
376 100 SmackVContext * const smk = avctx->priv_data;
377 uint8_t *out;
378 uint32_t *pal;
379 GetByteContext gb2;
380 GetBitContext gb;
381 int blocks, blk, bw, bh;
382 int i, ret;
383 int stride;
384 int flags;
385
386
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 100 if (avpkt->size <= 769)
387 ✗ return AVERROR_INVALIDDATA;
388
389
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 100 if ((ret = ff_reget_buffer(avctx, smk->pic, 0)) < 0)
390 ✗ return ret;
391
392 /* make the palette available on the way out */
393 100 pal = (uint32_t*)smk->pic->data[1];
394 100 bytestream2_init(&gb2, avpkt->data, avpkt->size);
395 100 flags = bytestream2_get_byteu(&gb2);
396 #if FF_API_PALETTE_HAS_CHANGED
397 FF_DISABLE_DEPRECATION_WARNINGS
398 100 smk->pic->palette_has_changed = flags & 1;
399 FF_ENABLE_DEPRECATION_WARNINGS
400 #endif
401
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 100 if (flags & 2) {
402 1 smk->pic->flags |= AV_FRAME_FLAG_KEY;
403 1 smk->pic->pict_type = AV_PICTURE_TYPE_I;
404 } else {
405 99 smk->pic->flags &= ~AV_FRAME_FLAG_KEY;
406 99 smk->pic->pict_type = AV_PICTURE_TYPE_P;
407 }
408
409
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 25700 for(i = 0; i < 256; i++)
410 25600 *pal++ = 0xFFU << 24 | bytestream2_get_be24u(&gb2);
411
412 100 last_reset(smk->mmap_tbl, smk->mmap_last);
413 100 last_reset(smk->mclr_tbl, smk->mclr_last);
414 100 last_reset(smk->full_tbl, smk->full_last);
415 100 last_reset(smk->type_tbl, smk->type_last);
416
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 100 if ((ret = init_get_bits8(&gb, avpkt->data + 769, avpkt->size - 769)) < 0)
417 ✗ return ret;
418
419 100 blk = 0;
420 100 bw = avctx->width >> 2;
421 100 bh = avctx->height >> 2;
422 100 blocks = bw * bh;
423 100 stride = smk->pic->linesize[0];
424
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 44693 while(blk < blocks) {
425 int type, run, mode;
426 uint16_t pix;
427
428 44593 type = smk_get_code(&gb, smk->type_tbl, smk->type_last);
429
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 44593 if (type < 0)
430 ✗ return type;
431 44593 run = block_runs[(type >> 2) & 0x3F];
432
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 44593 switch(type & 3){
433 15331 case SMK_BLK_MONO:
434
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 43679 while(run-- && blk < blocks){
435 int clr, map;
436 int hi, lo;
437 28348 clr = smk_get_code(&gb, smk->mclr_tbl, smk->mclr_last);
438 28348 map = smk_get_code(&gb, smk->mmap_tbl, smk->mmap_last);
439 28348 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
440 28348 hi = clr >> 8;
441 28348 lo = clr & 0xFF;
442
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 141740 for(i = 0; i < 4; i++) {
443
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 113392 if(map & 1) out[0] = hi; else out[0] = lo;
444
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 113392 if(map & 2) out[1] = hi; else out[1] = lo;
445
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 113392 if(map & 4) out[2] = hi; else out[2] = lo;
446
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 113392 if(map & 8) out[3] = hi; else out[3] = lo;
447 113392 map >>= 4;
448 113392 out += stride;
449 }
450 28348 blk++;
451 }
452 15331 break;
453 11617 case SMK_BLK_FULL:
454 11617 mode = 0;
455
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 11617 if(avctx->codec_tag == MKTAG('S', 'M', 'K', '4')) { // In case of Smacker v4 we have three modes
456 ✗ if (get_bits_left(&gb) < 1)
457 ✗ return AVERROR_INVALIDDATA;
458 ✗ if(get_bits1(&gb)) mode = 1;
459 ✗ else if(get_bits1(&gb)) mode = 2;
460 }
461
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 89198 while(run-- && blk < blocks){
462 77581 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
463
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 77581 switch(mode){
464 77581 case 0:
465
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 387905 for(i = 0; i < 4; i++) {
466 310324 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
467 310324 AV_WL16(out+2,pix);
468 310324 pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
469 310324 AV_WL16(out,pix);
470 310324 out += stride;
471 }
472 77581 break;
473 ✗ case 1:
474 ✗ pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
475 ✗ out[0] = out[1] = pix & 0xFF;
476 ✗ out[2] = out[3] = pix >> 8;
477 ✗ out += stride;
478 ✗ out[0] = out[1] = pix & 0xFF;
479 ✗ out[2] = out[3] = pix >> 8;
480 ✗ out += stride;
481 ✗ pix = smk_get_code(&gb, smk->full_tbl, smk->full_last);
482 ✗ out[0] = out[1] = pix & 0xFF;
483 ✗ out[2] = out[3] = pix >> 8;
484 ✗ out += stride;
485 ✗ out[0] = out[1] = pix & 0xFF;
486 ✗ out[2] = out[3] = pix >> 8;
487 ✗ break;
488 ✗ case 2:
489 ✗ for(i = 0; i < 2; i++) {
490 uint16_t pix1, pix2;
491 ✗ pix2 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
492 ✗ pix1 = smk_get_code(&gb, smk->full_tbl, smk->full_last);
493 ✗ AV_WL16(out,pix1);
494 ✗ AV_WL16(out+2,pix2);
495 ✗ out += stride;
496 ✗ AV_WL16(out,pix1);
497 ✗ AV_WL16(out+2,pix2);
498 ✗ out += stride;
499 }
500 ✗ break;
501 }
502 77581 blk++;
503 }
504 11617 break;
505 10001 case SMK_BLK_SKIP:
506
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 288422 while(run-- && blk < blocks)
507 278421 blk++;
508 10001 break;
509 7644 case SMK_BLK_FILL:
510 7644 mode = type >> 8;
511
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 23294 while(run-- && blk < blocks){
512 uint32_t col;
513 15650 out = smk->pic->data[0] + (blk / bw) * (stride * 4) + (blk % bw) * 4;
514 15650 col = mode * 0x01010101U;
515
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 78250 for(i = 0; i < 4; i++) {
516 62600 *((uint32_t*)out) = col;
517 62600 out += stride;
518 }
519 15650 blk++;
520 }
521 7644 break;
522 }
523
524 }
525
526
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 100 if ((ret = av_frame_ref(rframe, smk->pic)) < 0)
527 ✗ return ret;
528
529 100 *got_frame = 1;
530
531 /* always report that the buffer was completely consumed */
532 100 return avpkt->size;
533 }
534
535
536 3 static av_cold int decode_end(AVCodecContext *avctx)
537 {
538 3 SmackVContext * const smk = avctx->priv_data;
539
540 3 av_freep(&smk->mmap_tbl);
541 3 av_freep(&smk->mclr_tbl);
542 3 av_freep(&smk->full_tbl);
543 3 av_freep(&smk->type_tbl);
544
545 3 av_frame_free(&smk->pic);
546
547 3 return 0;
548 }
549
550
551 3 static av_cold int decode_init(AVCodecContext *avctx)
552 {
553 3 SmackVContext * const c = avctx->priv_data;
554 int ret;
555
556 3 c->avctx = avctx;
557
558 3 avctx->pix_fmt = AV_PIX_FMT_PAL8;
559
560 3 c->pic = av_frame_alloc();
561
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 3 if (!c->pic)
562 ✗ return AVERROR(ENOMEM);
563
564 /* decode huffman trees from extradata */
565
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 3 if (avctx->extradata_size <= 16){
566 ✗ av_log(avctx, AV_LOG_ERROR, "Extradata missing!\n");
567 ✗ return AVERROR(EINVAL);
568 }
569
570 3 ret = decode_header_trees(c);
571
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 3 if (ret < 0) {
572 ✗ return ret;
573 }
574
575 3 return 0;
576 }
577
578
579 3 static av_cold int smka_decode_init(AVCodecContext *avctx)
580 {
581 3 int channels = avctx->ch_layout.nb_channels;
582
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 3 if (channels < 1 || channels > 2) {
583 ✗ av_log(avctx, AV_LOG_ERROR, "invalid number of channels\n");
584 ✗ return AVERROR_INVALIDDATA;
585 }
586 3 av_channel_layout_uninit(&avctx->ch_layout);
587 3 av_channel_layout_default(&avctx->ch_layout, channels);
588 3 avctx->sample_fmt = avctx->bits_per_coded_sample == 8 ? AV_SAMPLE_FMT_U8 : AV_SAMPLE_FMT_S16;
589
590 3 return 0;
591 }
592
593 /**
594 * Decode Smacker audio data
595 */
596 86 static int smka_decode_frame(AVCodecContext *avctx, AVFrame *frame,
597 int *got_frame_ptr, AVPacket *avpkt)
598 {
599 86 const uint8_t *buf = avpkt->data;
600 86 int buf_size = avpkt->size;
601 GetBitContext gb;
602 86 VLC vlc[4] = { { 0 } };
603 int16_t *samples;
604 uint8_t *samples8;
605 uint8_t values[4];
606 int i, res, ret;
607 int unp_size;
608 int bits, stereo;
609 unsigned pred[2], val, val2;
610
611
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 86 if (buf_size <= 4) {
612 ✗ av_log(avctx, AV_LOG_ERROR, "packet is too small\n");
613 ✗ return AVERROR_INVALIDDATA;
614 }
615
616 86 unp_size = AV_RL32(buf);
617
618
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 86 if (unp_size > (1U<<24)) {
619 ✗ av_log(avctx, AV_LOG_ERROR, "packet is too big\n");
620 ✗ return AVERROR_INVALIDDATA;
621 }
622
623
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 86 if ((ret = init_get_bits8(&gb, buf + 4, buf_size - 4)) < 0)
624 ✗ return ret;
625
626
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 86 if(!get_bits1(&gb)){
627 ✗ av_log(avctx, AV_LOG_INFO, "Sound: no data\n");
628 ✗ *got_frame_ptr = 0;
629 ✗ return 1;
630 }
631 86 stereo = get_bits1(&gb);
632 86 bits = get_bits1(&gb);
633
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 86 if (stereo ^ (avctx->ch_layout.nb_channels != 1)) {
634 ✗ av_log(avctx, AV_LOG_ERROR, "channels mismatch\n");
635 ✗ return AVERROR_INVALIDDATA;
636 }
637
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 86 if (bits == (avctx->sample_fmt == AV_SAMPLE_FMT_U8)) {
638 ✗ av_log(avctx, AV_LOG_ERROR, "sample format mismatch\n");
639 ✗ return AVERROR_INVALIDDATA;
640 }
641
642 /* get output buffer */
643 86 frame->nb_samples = unp_size / (avctx->ch_layout.nb_channels * (bits + 1));
644
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 86 if (unp_size % (avctx->ch_layout.nb_channels * (bits + 1))) {
645 ✗ av_log(avctx, AV_LOG_ERROR,
646 "The buffer does not contain an integer number of samples\n");
647 ✗ return AVERROR_INVALIDDATA;
648 }
649
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 86 if ((ret = ff_get_buffer(avctx, frame, 0)) < 0)
650 ✗ return ret;
651 86 samples = (int16_t *)frame->data[0];
652 86 samples8 = frame->data[0];
653
654 // Initialize
655
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 172 for(i = 0; i < (1 << (bits + stereo)); i++) {
656 HuffContext h;
657 86 h.current = 0;
658 86 skip_bits1(&gb);
659
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 86 if ((ret = smacker_decode_tree(avctx, &gb, &h, 0)) < 0)
660 ✗ goto error;
661 86 skip_bits1(&gb);
662
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 86 if (h.current > 1) {
663 80 ret = ff_vlc_init_from_lengths(&vlc[i], SMKTREE_BITS, h.current,
664 &h.entries[0].length, sizeof(*h.entries),
665 &h.entries[0].value, sizeof(*h.entries), 1,
666 0, VLC_INIT_OUTPUT_LE, avctx);
667
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 80 if (ret < 0) {
668 ✗ av_log(avctx, AV_LOG_ERROR, "Cannot build VLC table\n");
669 ✗ goto error;
670 }
671 } else
672 6 values[i] = h.entries[0].value;
673 }
674 /* this codec relies on wraparound instead of clipping audio */
675
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 86 if(bits) { //decode 16-bit data
676 ✗ for(i = stereo; i >= 0; i--)
677 ✗ pred[i] = av_bswap16(get_bits(&gb, 16));
678 ✗ for(i = 0; i <= stereo; i++)
679 ✗ *samples++ = pred[i];
680 ✗ unp_size /= 2;
681
682 ✗ if (vlc[0 ].table || vlc[ 1].table ||
683 ✗ vlc[2*stereo].table || vlc[2*stereo+1].table) {
684 ✗ for(; i < unp_size ; i++) {
685 ✗ unsigned idx = 2 * (i & stereo);
686 ✗ if (get_bits_left(&gb) < 0) {
687 ✗ ret = AVERROR_INVALIDDATA;
688 ✗ goto error;
689 }
690 ✗ if (vlc[idx].table)
691 ✗ res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
692 else
693 ✗ res = values[idx];
694 ✗ val = res;
695 ✗ if (vlc[++idx].table)
696 ✗ res = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
697 else
698 ✗ res = values[idx];
699 ✗ val |= res << 8;
700 ✗ pred[idx / 2] += val;
701 ✗ *samples++ = pred[idx / 2];
702 }
703 ✗ } else if (stereo) {
704 ✗ val = 256*values[1] + values[0];
705 ✗ val2 = 256*values[3] + values[2];
706 ✗ for(; i < unp_size; i+=2) {
707 ✗ pred[0] += val;
708 ✗ pred[1] += val2;
709 ✗ *samples++ = pred[0];
710 ✗ *samples++ = pred[1];
711 }
712 } else {
713 ✗ val = 256*values[1] + values[0];
714 ✗ for(; i < unp_size; i++) {
715 ✗ pred[0] += val;
716 ✗ *samples++ = pred[0];
717 }
718 }
719 } else { //8-bit data
720
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 172 for(i = stereo; i >= 0; i--)
721 86 pred[i] = get_bits(&gb, 8);
722
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 172 for(i = 0; i <= stereo; i++)
723 86 *samples8++ = pred[i];
724
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 156552 for(; i < unp_size; i++) {
725 156466 unsigned idx = i & stereo;
726
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 156466 if (get_bits_left(&gb) < 0) {
727 ✗ ret = AVERROR_INVALIDDATA;
728 ✗ goto error;
729 }
730
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 156466 if (vlc[idx].table)
731 147216 val = get_vlc2(&gb, vlc[idx].table, SMKTREE_BITS, 3);
732 else
733 9250 val = values[idx];
734 156466 pred[idx] += val;
735 156466 *samples8++ = pred[idx];
736 }
737 }
738
739 86 *got_frame_ptr = 1;
740 86 ret = buf_size;
741
742 86 error:
743
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 430 for(i = 0; i < 4; i++) {
744 344 ff_vlc_free(&vlc[i]);
745 }
746
747 86 return ret;
748 }
749
750 const FFCodec ff_smacker_decoder = {
751 .p.name = "smackvid",
752 CODEC_LONG_NAME("Smacker video"),
753 .p.type = AVMEDIA_TYPE_VIDEO,
754 .p.id = AV_CODEC_ID_SMACKVIDEO,
755 .priv_data_size = sizeof(SmackVContext),
756 .init = decode_init,
757 .close = decode_end,
758 FF_CODEC_DECODE_CB(decode_frame),
759 .p.capabilities = AV_CODEC_CAP_DR1,
760 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
761 };
762
763 const FFCodec ff_smackaud_decoder = {
764 .p.name = "smackaud",
765 CODEC_LONG_NAME("Smacker audio"),
766 .p.type = AVMEDIA_TYPE_AUDIO,
767 .p.id = AV_CODEC_ID_SMACKAUDIO,
768 .init = smka_decode_init,
769 FF_CODEC_DECODE_CB(smka_decode_frame),
770 .p.capabilities = AV_CODEC_CAP_DR1,
771 };
772