FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/svq1dec.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 297 356 83.4%
Functions: 12 14 85.7%
Branches: 171 229 74.7%
Line Branch Exec Source
1 /*
2 * SVQ1 decoder
3 * ported to MPlayer by Arpi <arpi@thot.banki.hu>
4 * ported to libavcodec by Nick Kurshev <nickols_k@mail.ru>
5 *
6 * Copyright (c) 2002 The Xine project
7 * Copyright (c) 2002 The FFmpeg project
8 *
9 * SVQ1 Encoder (c) 2004 Mike Melanson <melanson@pcisys.net>
10 *
11 * This file is part of FFmpeg.
12 *
13 * FFmpeg is free software; you can redistribute it and/or
14 * modify it under the terms of the GNU Lesser General Public
15 * License as published by the Free Software Foundation; either
16 * version 2.1 of the License, or (at your option) any later version.
17 *
18 * FFmpeg is distributed in the hope that it will be useful,
19 * but WITHOUT ANY WARRANTY; without even the implied warranty of
20 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
21 * Lesser General Public License for more details.
22 *
23 * You should have received a copy of the GNU Lesser General Public
24 * License along with FFmpeg; if not, write to the Free Software
25 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
26 */
27
28 /**
29 * @file
30 * Sorenson Vector Quantizer #1 (SVQ1) video codec.
31 * For more information of the SVQ1 algorithm, visit:
32 * http://www.pcisys.net/~melanson/codecs/
33 */
34
35 #include "libavutil/crc.h"
36 #include "libavutil/mem.h"
37 #include "libavutil/thread.h"
38
39 #include "avcodec.h"
40 #include "codec_internal.h"
41 #include "decode.h"
42 #include "get_bits.h"
43 #include "h263data.h"
44 #include "hpeldsp.h"
45 #include "mathops.h"
46 #include "svq1.h"
47
48 #define SVQ1_BLOCK_TYPE_VLC_BITS 3
49 static VLCElem svq1_block_type[8];
50 static VLCElem svq1_motion_component[176];
51 static const VLCElem *svq1_intra_multistage[6];
52 static const VLCElem *svq1_inter_multistage[6];
53 static VLCElem svq1_intra_mean[632];
54 static VLCElem svq1_inter_mean[1434];
55
56 /* motion vector (prediction) */
57 typedef struct svq1_pmv_s {
58 int x;
59 int y;
60 } svq1_pmv;
61
62 typedef struct SVQ1Context {
63 HpelDSPContext hdsp;
64 GetBitContext gb;
65 AVFrame *prev;
66
67 uint8_t *pkt_swapped;
68 int pkt_swapped_allocated;
69
70 svq1_pmv *pmv;
71 int pmv_allocated;
72
73 int width;
74 int height;
75 int frame_code;
76 int nonref; // 1 if the current frame won't be referenced
77
78 int last_tempref;
79 } SVQ1Context;
80
81 static const uint8_t string_table[256] = {
82 0x00, 0xD5, 0x7F, 0xAA, 0xFE, 0x2B, 0x81, 0x54,
83 0x29, 0xFC, 0x56, 0x83, 0xD7, 0x02, 0xA8, 0x7D,
84 0x52, 0x87, 0x2D, 0xF8, 0xAC, 0x79, 0xD3, 0x06,
85 0x7B, 0xAE, 0x04, 0xD1, 0x85, 0x50, 0xFA, 0x2F,
86 0xA4, 0x71, 0xDB, 0x0E, 0x5A, 0x8F, 0x25, 0xF0,
87 0x8D, 0x58, 0xF2, 0x27, 0x73, 0xA6, 0x0C, 0xD9,
88 0xF6, 0x23, 0x89, 0x5C, 0x08, 0xDD, 0x77, 0xA2,
89 0xDF, 0x0A, 0xA0, 0x75, 0x21, 0xF4, 0x5E, 0x8B,
90 0x9D, 0x48, 0xE2, 0x37, 0x63, 0xB6, 0x1C, 0xC9,
91 0xB4, 0x61, 0xCB, 0x1E, 0x4A, 0x9F, 0x35, 0xE0,
92 0xCF, 0x1A, 0xB0, 0x65, 0x31, 0xE4, 0x4E, 0x9B,
93 0xE6, 0x33, 0x99, 0x4C, 0x18, 0xCD, 0x67, 0xB2,
94 0x39, 0xEC, 0x46, 0x93, 0xC7, 0x12, 0xB8, 0x6D,
95 0x10, 0xC5, 0x6F, 0xBA, 0xEE, 0x3B, 0x91, 0x44,
96 0x6B, 0xBE, 0x14, 0xC1, 0x95, 0x40, 0xEA, 0x3F,
97 0x42, 0x97, 0x3D, 0xE8, 0xBC, 0x69, 0xC3, 0x16,
98 0xEF, 0x3A, 0x90, 0x45, 0x11, 0xC4, 0x6E, 0xBB,
99 0xC6, 0x13, 0xB9, 0x6C, 0x38, 0xED, 0x47, 0x92,
100 0xBD, 0x68, 0xC2, 0x17, 0x43, 0x96, 0x3C, 0xE9,
101 0x94, 0x41, 0xEB, 0x3E, 0x6A, 0xBF, 0x15, 0xC0,
102 0x4B, 0x9E, 0x34, 0xE1, 0xB5, 0x60, 0xCA, 0x1F,
103 0x62, 0xB7, 0x1D, 0xC8, 0x9C, 0x49, 0xE3, 0x36,
104 0x19, 0xCC, 0x66, 0xB3, 0xE7, 0x32, 0x98, 0x4D,
105 0x30, 0xE5, 0x4F, 0x9A, 0xCE, 0x1B, 0xB1, 0x64,
106 0x72, 0xA7, 0x0D, 0xD8, 0x8C, 0x59, 0xF3, 0x26,
107 0x5B, 0x8E, 0x24, 0xF1, 0xA5, 0x70, 0xDA, 0x0F,
108 0x20, 0xF5, 0x5F, 0x8A, 0xDE, 0x0B, 0xA1, 0x74,
109 0x09, 0xDC, 0x76, 0xA3, 0xF7, 0x22, 0x88, 0x5D,
110 0xD6, 0x03, 0xA9, 0x7C, 0x28, 0xFD, 0x57, 0x82,
111 0xFF, 0x2A, 0x80, 0x55, 0x01, 0xD4, 0x7E, 0xAB,
112 0x84, 0x51, 0xFB, 0x2E, 0x7A, 0xAF, 0x05, 0xD0,
113 0xAD, 0x78, 0xD2, 0x07, 0x53, 0x86, 0x2C, 0xF9
114 };
115
116 #define SVQ1_PROCESS_VECTOR() \
117 for (; level > 0; i++) { \
118 /* process next depth */ \
119 if (i == m) { \
120 m = n; \
121 if (--level == 0) \
122 break; \
123 } \
124 /* divide block if next bit set */ \
125 if (!get_bits1(bitbuf)) \
126 break; \
127 /* add child nodes */ \
128 list[n++] = list[i]; \
129 list[n++] = list[i] + (((level & 1) ? pitch : 1) << ((level >> 1) + 1));\
130 }
131
132 #define SVQ1_ADD_CODEBOOK() \
133 /* add codebook entries to vector */ \
134 for (j = 0; j < stages; j++) { \
135 n3 = codebook[entries[j]] ^ 0x80808080; \
136 n1 += (n3 & 0xFF00FF00) >> 8; \
137 n2 += n3 & 0x00FF00FF; \
138 } \
139 \
140 /* clip to [0..255] */ \
141 if (n1 & 0xFF00FF00) { \
142 n3 = (n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
143 n1 += 0x7F007F00; \
144 n1 |= (~n1 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
145 n1 &= n3 & 0x00FF00FF; \
146 } \
147 \
148 if (n2 & 0xFF00FF00) { \
149 n3 = (n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
150 n2 += 0x7F007F00; \
151 n2 |= (~n2 >> 15 & 0x00010001 | 0x01000100) - 0x00010001; \
152 n2 &= n3 & 0x00FF00FF; \
153 }
154
155 #define SVQ1_CALC_CODEBOOK_ENTRIES(cbook) \
156 codebook = (const uint32_t *)cbook[level]; \
157 if (stages > 0) \
158 bit_cache = get_bits(bitbuf, 4 * stages); \
159 /* calculate codebook entries for this vector */ \
160 for (j = 0; j < stages; j++) { \
161 entries[j] = (((bit_cache >> (4 * (stages - j - 1))) & 0xF) + \
162 16 * j) << (level + 1); \
163 } \
164 mean -= stages * 128; \
165 n4 = (mean << 16) + mean;
166
167 12441 static int svq1_decode_block_intra(GetBitContext *bitbuf, uint8_t *pixels,
168 ptrdiff_t pitch)
169 {
170 uint32_t bit_cache;
171 uint8_t *list[63];
172 uint32_t *dst;
173 const uint32_t *codebook;
174 int entries[6];
175 int i, j, m, n;
176 int stages;
177 unsigned mean;
178 unsigned x, y, width, height, level;
179 uint32_t n1, n2, n3, n4;
180
181 /* initialize list for breadth first processing of vectors */
182 12441 list[0] = pixels;
183
184 /* recursively process vector */
185
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 257446 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
186
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 477569 SVQ1_PROCESS_VECTOR();
187
188 /* destination address and vector size */
189 245005 dst = (uint32_t *)list[i];
190 245005 width = 1 << ((4 + level) / 2);
191 245005 height = 1 << ((3 + level) / 2);
192
193 /* get number of stages (-1 skips vector, 0 for mean only) */
194 245005 stages = get_vlc2(bitbuf, svq1_intra_multistage[level], 4, 2) - 1;
195
196
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 245005 if (stages == -1) {
197
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 4493 for (y = 0; y < height; y++)
198 4122 memset(&dst[y * (pitch / 4)], 0, width);
199 371 continue; /* skip vector */
200 }
201
202
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 244634 if ((stages > 0 && level >= 4)) {
203 ff_dlog(NULL,
204 "Error (svq1_decode_block_intra): invalid vector: stages=%i level=%i\n",
205 stages, level);
206 ✗ return AVERROR_INVALIDDATA; /* invalid vector */
207 }
208
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 244634 av_assert0(stages >= 0);
209
210 244634 mean = get_vlc2(bitbuf, svq1_intra_mean, 8, 3);
211
212
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 244634 if (stages == 0) {
213
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 219558 for (y = 0; y < height; y++)
214 159516 memset(&dst[y * (pitch / 4)], mean, width);
215 } else {
216
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 1138390 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks);
217
218
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 686286 for (y = 0; y < height; y++) {
219
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 1086688 for (x = 0; x < width / 4; x++, codebook++) {
220 584994 n1 = n4;
221 584994 n2 = n4;
222
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 3531784 SVQ1_ADD_CODEBOOK()
223 /* store result */
224 584994 dst[x] = n1 << 8 | n2;
225 }
226 501694 dst += pitch / 4;
227 }
228 }
229 }
230
231 12441 return 0;
232 }
233
234 65975 static int svq1_decode_block_non_intra(GetBitContext *bitbuf, uint8_t *pixels,
235 ptrdiff_t pitch, int buggy)
236 {
237 uint32_t bit_cache;
238 uint8_t *list[63];
239 uint32_t *dst;
240 const uint32_t *codebook;
241 int entries[6];
242 int i, j, m, n;
243 int stages;
244 unsigned mean;
245 int x, y, width, height, level;
246 uint32_t n1, n2, n3, n4;
247
248 /* initialize list for breadth first processing of vectors */
249 65975 list[0] = pixels;
250
251 /* recursively process vector */
252
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 1302647 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
253
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 2407369 SVQ1_PROCESS_VECTOR();
254
255 /* destination address and vector size */
256 1236672 dst = (uint32_t *)list[i];
257 1236672 width = 1 << ((4 + level) / 2);
258 1236672 height = 1 << ((3 + level) / 2);
259
260 /* get number of stages (-1 skips vector, 0 for mean only) */
261 1236672 stages = get_vlc2(bitbuf, svq1_inter_multistage[level], 3, 2) - 1;
262
263
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 1236672 if (stages == -1)
264 30871 continue; /* skip vector */
265
266
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 1205801 if ((stages > 0 && level >= 4)) {
267 ff_dlog(NULL,
268 "Error (svq1_decode_block_non_intra): invalid vector: stages=%i level=%i\n",
269 stages, level);
270 ✗ return AVERROR_INVALIDDATA; /* invalid vector */
271 }
272
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 1205801 av_assert0(stages >= 0);
273
274 1205801 mean = get_vlc2(bitbuf, svq1_inter_mean, 9, 3) - 256;
275
276
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 1205801 if (buggy) {
277 ✗ if (mean == -128)
278 ✗ mean = 128;
279 ✗ else if (mean == 128)
280 ✗ mean = -128;
281 }
282
283
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 3378590 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks);
284
285
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 4440519 for (y = 0; y < height; y++) {
286
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 7254136 for (x = 0; x < width / 4; x++) {
287 4019418 n3 = dst[x];
288 /* add mean value to vector */
289 4019418 n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
290 4019418 n2 = n4 + (n3 & 0x00FF00FF);
291
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 9396766 SVQ1_ADD_CODEBOOK()
292 /* store result */
293 4019418 dst[x] = n1 << 8 | n2;
294
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 4019418 if (codebook != NULL)
295 3648410 codebook++;
296 }
297 3234718 dst += pitch / 4;
298 }
299 }
300 65975 return 0;
301 }
302
303 80333 static int svq1_decode_motion_vector(GetBitContext *bitbuf, svq1_pmv *mv,
304 svq1_pmv **pmv)
305 {
306 int diff;
307 int i;
308
309
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 240999 for (i = 0; i < 2; i++) {
310 /* get motion code */
311 160666 diff = get_vlc2(bitbuf, svq1_motion_component, 7, 2);
312
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 160666 if (diff < 0)
313 ✗ return AVERROR_INVALIDDATA;
314
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 160666 else if (diff) {
315
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 79666 if (get_bits1(bitbuf))
316 34620 diff = -diff;
317 }
318
319 /* add median of motion vector predictors and clip result */
320
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 160666 if (i == 1)
321 80333 mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
322 else
323 80333 mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
324 }
325
326 80333 return 0;
327 }
328
329 6710 static void svq1_skip_block(uint8_t *current, uint8_t *previous,
330 ptrdiff_t pitch, int x, int y)
331 {
332 uint8_t *src;
333 uint8_t *dst;
334 int i;
335
336 6710 src = &previous[x + y * pitch];
337 6710 dst = current;
338
339
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 114070 for (i = 0; i < 16; i++) {
340 107360 memcpy(dst, src, 16);
341 107360 src += pitch;
342 107360 dst += pitch;
343 }
344 6710 }
345
346 61189 static int svq1_motion_inter_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,
347 uint8_t *current, uint8_t *previous,
348 ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
349 int width, int height)
350 {
351 uint8_t *src;
352 uint8_t *dst;
353 svq1_pmv mv;
354 svq1_pmv *pmv[3];
355 int result;
356
357 /* predict and decode motion vector */
358 61189 pmv[0] = &motion[0];
359
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 61189 if (y == 0) {
360 5038 pmv[1] =
361 5038 pmv[2] = pmv[0];
362 } else {
363 56151 pmv[1] = &motion[x / 8 + 2];
364 56151 pmv[2] = &motion[x / 8 + 4];
365 }
366
367 61189 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
368
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 61189 if (result)
369 ✗ return result;
370
371 61189 motion[0].x =
372 61189 motion[x / 8 + 2].x =
373 61189 motion[x / 8 + 3].x = mv.x;
374 61189 motion[0].y =
375 61189 motion[x / 8 + 2].y =
376 61189 motion[x / 8 + 3].y = mv.y;
377
378 61189 mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
379 61189 mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
380
381 61189 src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
382 61189 dst = current;
383
384 61189 hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
385
386 61189 return 0;
387 }
388
389 4786 static int svq1_motion_inter_4v_block(HpelDSPContext *hdsp, GetBitContext *bitbuf,
390 uint8_t *current, uint8_t *previous,
391 ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
392 int width, int height)
393 {
394 uint8_t *src;
395 uint8_t *dst;
396 svq1_pmv mv;
397 svq1_pmv *pmv[4];
398 int i, result;
399
400 /* predict and decode motion vector (0) */
401 4786 pmv[0] = &motion[0];
402
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 4786 if (y == 0) {
403 740 pmv[1] =
404 740 pmv[2] = pmv[0];
405 } else {
406 4046 pmv[1] = &motion[(x / 8) + 2];
407 4046 pmv[2] = &motion[(x / 8) + 4];
408 }
409
410 4786 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
411
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 4786 if (result)
412 ✗ return result;
413
414 /* predict and decode motion vector (1) */
415 4786 pmv[0] = &mv;
416
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 4786 if (y == 0) {
417 740 pmv[1] =
418 740 pmv[2] = pmv[0];
419 } else {
420 4046 pmv[1] = &motion[(x / 8) + 3];
421 }
422 4786 result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
423
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 4786 if (result)
424 ✗ return result;
425
426 /* predict and decode motion vector (2) */
427 4786 pmv[1] = &motion[0];
428 4786 pmv[2] = &motion[(x / 8) + 1];
429
430 4786 result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);
431
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 4786 if (result)
432 ✗ return result;
433
434 /* predict and decode motion vector (3) */
435 4786 pmv[2] = &motion[(x / 8) + 2];
436 4786 pmv[3] = &motion[(x / 8) + 3];
437
438 4786 result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);
439
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 4786 if (result)
440 ✗ return result;
441
442 /* form predictions */
443
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 23930 for (i = 0; i < 4; i++) {
444 19144 int mvx = pmv[i]->x + (i & 1) * 16;
445 19144 int mvy = pmv[i]->y + (i >> 1) * 16;
446
447 // FIXME: clipping or padding?
448 19144 mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
449 19144 mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
450
451 19144 src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
452 19144 dst = current;
453
454 19144 hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
455
456 /* select next block */
457
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 19144 if (i & 1)
458 9572 current += 8 * (pitch - 1);
459 else
460 9572 current += 8;
461 }
462
463 4786 return 0;
464 }
465
466 76501 static int svq1_decode_delta_block(AVCodecContext *avctx, HpelDSPContext *hdsp,
467 GetBitContext *bitbuf,
468 uint8_t *current, uint8_t *previous,
469 ptrdiff_t pitch, svq1_pmv *motion, int x, int y,
470 int width, int height, int buggy)
471 {
472 uint32_t block_type;
473 76501 int result = 0;
474
475 /* get block type */
476 76501 block_type = get_vlc2(bitbuf, svq1_block_type,
477 SVQ1_BLOCK_TYPE_VLC_BITS, 1);
478
479 /* reset motion vectors */
480
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 76501 if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
481 10526 motion[0].x =
482 10526 motion[0].y =
483 10526 motion[x / 8 + 2].x =
484 10526 motion[x / 8 + 2].y =
485 10526 motion[x / 8 + 3].x =
486 10526 motion[x / 8 + 3].y = 0;
487 }
488
489
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 76501 switch (block_type) {
490 6710 case SVQ1_BLOCK_SKIP:
491 6710 svq1_skip_block(current, previous, pitch, x, y);
492 6710 break;
493
494 61189 case SVQ1_BLOCK_INTER:
495 61189 result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,
496 pitch, motion, x, y, width, height);
497
498
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 61189 if (result != 0) {
499 ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
500 ✗ break;
501 }
502 61189 result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
503 61189 break;
504
505 4786 case SVQ1_BLOCK_INTER_4V:
506 4786 result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,
507 pitch, motion, x, y, width, height);
508
509
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 4786 if (result != 0) {
510 ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
511 ✗ break;
512 }
513 4786 result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
514 4786 break;
515
516 3816 case SVQ1_BLOCK_INTRA:
517 3816 result = svq1_decode_block_intra(bitbuf, current, pitch);
518 3816 break;
519 }
520
521 76501 return result;
522 }
523
524 ✗ static void svq1_parse_string(GetBitContext *bitbuf, uint8_t out[257])
525 {
526 uint8_t seed;
527 int i;
528
529 ✗ out[0] = get_bits(bitbuf, 8);
530 ✗ seed = string_table[out[0]];
531
532 ✗ for (i = 1; i <= out[0]; i++) {
533 ✗ out[i] = get_bits(bitbuf, 8) ^ seed;
534 ✗ seed = string_table[out[i] ^ seed];
535 }
536 ✗ out[i] = 0;
537 ✗ }
538
539 365 static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame, int * buggy)
540 {
541 365 SVQ1Context *s = avctx->priv_data;
542 365 GetBitContext *bitbuf = &s->gb;
543 int frame_size_code;
544 365 int width = s->width;
545 365 int height = s->height;
546 int tempref;
547
548 365 tempref = get_bits(bitbuf, 8); /* temporal_reference */
549
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 365 *buggy = tempref == 0 && s->last_tempref == 0 && avctx->extradata_size == 0;
550 365 s->last_tempref = tempref;
551
552 /* frame type */
553 365 s->nonref = 0;
554
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 365 switch (get_bits(bitbuf, 2)) {
555 37 case 0:
556 37 frame->pict_type = AV_PICTURE_TYPE_I;
557 37 break;
558 ✗ case 2:
559 ✗ s->nonref = 1;
560 328 case 1:
561 328 frame->pict_type = AV_PICTURE_TYPE_P;
562 328 break;
563 ✗ default:
564 ✗ av_log(avctx, AV_LOG_ERROR, "Invalid frame type.\n");
565 ✗ return AVERROR_INVALIDDATA;
566 }
567
568
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 365 if (frame->pict_type == AV_PICTURE_TYPE_I) {
569 /* unknown fields */
570
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 37 if (s->frame_code == 0x50 || s->frame_code == 0x60) {
571 1 int csum = get_bits(bitbuf, 16);
572
573 1 csum = av_bswap16(av_crc(av_crc_get_table(AV_CRC_16_CCITT), av_bswap16(csum), bitbuf->buffer, bitbuf->size_in_bits >> 3));
574
575 ff_dlog(avctx, "%s checksum (%02x) for packet data\n",
576 (csum == 0) ? "correct" : "incorrect", csum);
577 }
578
579
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 37 if ((s->frame_code ^ 0x10) >= 0x50) {
580 uint8_t msg[257];
581
582 ✗ svq1_parse_string(bitbuf, msg);
583
584 ✗ av_log(avctx, AV_LOG_INFO,
585 "embedded message:\n%s\n", ((char *)msg) + 1);
586 }
587
588 37 skip_bits(bitbuf, 2);
589 37 skip_bits(bitbuf, 2);
590 37 skip_bits1(bitbuf);
591
592 /* load frame size */
593 37 frame_size_code = get_bits(bitbuf, 3);
594
595
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 37 if (frame_size_code == 7) {
596 /* load width, height (12 bits each) */
597 6 width = get_bits(bitbuf, 12);
598 6 height = get_bits(bitbuf, 12);
599
600
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 6 if (!width || !height)
601 ✗ return AVERROR_INVALIDDATA;
602 } else {
603 /* get width, height from table */
604 31 width = ff_svq1_frame_size_table[frame_size_code][0];
605 31 height = ff_svq1_frame_size_table[frame_size_code][1];
606 }
607 }
608
609 /* unknown fields */
610
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 365 if (get_bits1(bitbuf)) {
611 ✗ skip_bits1(bitbuf); /* use packet checksum if (1) */
612 ✗ skip_bits1(bitbuf); /* component checksums after image data if (1) */
613
614 ✗ if (get_bits(bitbuf, 2) != 0)
615 ✗ return AVERROR_INVALIDDATA;
616 }
617
618
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 365 if (get_bits1(bitbuf)) {
619 165 skip_bits1(bitbuf);
620 165 skip_bits(bitbuf, 4);
621 165 skip_bits1(bitbuf);
622 165 skip_bits(bitbuf, 2);
623
624
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 165 if (skip_1stop_8data_bits(bitbuf) < 0)
625 ✗ return AVERROR_INVALIDDATA;
626 }
627
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 365 if (get_bits_left(bitbuf) <= 0)
628 ✗ return AVERROR_INVALIDDATA;
629
630 365 s->width = width;
631 365 s->height = height;
632 365 return 0;
633 }
634
635 365 static int svq1_decode_frame(AVCodecContext *avctx, AVFrame *cur,
636 int *got_frame, AVPacket *avpkt)
637 {
638 365 const uint8_t *buf = avpkt->data;
639 365 int buf_size = avpkt->size;
640 365 SVQ1Context *s = avctx->priv_data;
641 uint8_t *current;
642 int result, i, x, y, width, height, buggy;
643 int ret;
644
645 /* initialize bit buffer */
646 365 ret = init_get_bits8(&s->gb, buf, buf_size);
647
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 365 if (ret < 0)
648 ✗ return ret;
649
650 /* decode frame header */
651 365 s->frame_code = get_bits(&s->gb, 22);
652
653
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 365 if ((s->frame_code & ~0x70) || !(s->frame_code & 0x60))
654 ✗ return AVERROR_INVALIDDATA;
655
656 /* swap some header bytes (why?) */
657
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 365 if (s->frame_code != 0x20) {
658 uint32_t *src;
659
660
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 6 if (buf_size < 9 * 4) {
661 ✗ av_log(avctx, AV_LOG_ERROR, "Input packet too small\n");
662 ✗ return AVERROR_INVALIDDATA;
663 }
664
665 6 av_fast_padded_malloc(&s->pkt_swapped,
666 6 &s->pkt_swapped_allocated,
667 buf_size);
668
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 6 if (!s->pkt_swapped)
669 ✗ return AVERROR(ENOMEM);
670
671 6 memcpy(s->pkt_swapped, buf, buf_size);
672 6 buf = s->pkt_swapped;
673 6 init_get_bits(&s->gb, buf, buf_size * 8);
674 6 skip_bits(&s->gb, 22);
675
676 6 src = (uint32_t *)(s->pkt_swapped + 4);
677
678
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 30 for (i = 0; i < 4; i++)
679 24 src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
680 }
681
682 365 result = svq1_decode_frame_header(avctx, cur, &buggy);
683
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 365 if (result != 0) {
684 ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
685 ✗ return result;
686 }
687
688 365 result = ff_set_dimensions(avctx, s->width, s->height);
689
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 365 if (result < 0)
690 ✗ return result;
691
692
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 365 if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
693
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 365 (avctx->skip_frame >= AVDISCARD_NONKEY &&
694 ✗ cur->pict_type != AV_PICTURE_TYPE_I) ||
695
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 365 avctx->skip_frame >= AVDISCARD_ALL)
696 ✗ return buf_size;
697
698 365 result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);
699
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 365 if (result < 0)
700 ✗ return result;
701
702 365 av_fast_padded_malloc(&s->pmv, &s->pmv_allocated, (FFALIGN(s->width, 16) / 8 + 3) * sizeof(*s->pmv));
703
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 365 if (!s->pmv)
704 ✗ return AVERROR(ENOMEM);
705
706 /* decode y, u and v components */
707
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 1460 for (i = 0; i < 3; i++) {
708 1095 int linesize = cur->linesize[i];
709
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 1095 if (i == 0) {
710 365 width = FFALIGN(s->width, 16);
711 365 height = FFALIGN(s->height, 16);
712 } else {
713
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 730 if (avctx->flags & AV_CODEC_FLAG_GRAY)
714 ✗ break;
715 730 width = FFALIGN(s->width / 4, 16);
716 730 height = FFALIGN(s->height / 4, 16);
717 }
718
719 1095 current = cur->data[i];
720
721
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 1095 if (cur->pict_type == AV_PICTURE_TYPE_I) {
722 /* keyframe */
723
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 766 for (y = 0; y < height; y += 16) {
724
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 9280 for (x = 0; x < width; x += 16) {
725 8625 result = svq1_decode_block_intra(&s->gb, &current[x],
726 linesize);
727
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 8625 if (result) {
728 ✗ av_log(avctx, AV_LOG_ERROR,
729 "Error in svq1_decode_block %i (keyframe)\n",
730 result);
731 ✗ return result;
732 }
733 }
734 655 current += 16 * linesize;
735 }
736 } else {
737 /* delta frame */
738 984 uint8_t *previous = s->prev->data[i];
739
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 984 if (!previous ||
740
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 984 s->prev->width != s->width || s->prev->height != s->height) {
741 ✗ av_log(avctx, AV_LOG_ERROR, "Missing reference frame.\n");
742 ✗ return AVERROR_INVALIDDATA;
743 }
744
745 984 memset(s->pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
746
747
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 6795 for (y = 0; y < height; y += 16) {
748
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 82312 for (x = 0; x < width; x += 16) {
749 76501 result = svq1_decode_delta_block(avctx, &s->hdsp,
750 &s->gb, &current[x],
751 previous, linesize,
752 s->pmv, x, y, width, height, buggy);
753
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 76501 if (result != 0) {
754 ff_dlog(avctx,
755 "Error in svq1_decode_delta_block %i\n",
756 result);
757 ✗ return result;
758 }
759 }
760
761 5811 s->pmv[0].x =
762 5811 s->pmv[0].y = 0;
763
764 5811 current += 16 * linesize;
765 }
766 }
767 }
768
769
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 365 if (!s->nonref) {
770 365 result = av_frame_replace(s->prev, cur);
771
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 365 if (result < 0)
772 ✗ return result;
773 }
774
775 365 *got_frame = 1;
776 365 result = buf_size;
777
778 365 return result;
779 }
780
781 9 static av_cold void svq1_static_init(void)
782 {
783 static VLCElem table[196];
784 9 VLCInitState state = VLC_INIT_STATE(table);
785
786 9 VLC_INIT_STATIC_TABLE(svq1_block_type, SVQ1_BLOCK_TYPE_VLC_BITS, 4,
787 &ff_svq1_block_type_vlc[0][1], 2, 1,
788 &ff_svq1_block_type_vlc[0][0], 2, 1, 0);
789
790 9 VLC_INIT_STATIC_TABLE(svq1_motion_component, 7, 33,
791 &ff_mvtab[0][1], 2, 1,
792 &ff_mvtab[0][0], 2, 1, 0);
793
794
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 63 for (int i = 0; i < 6; i++) {
795 54 svq1_intra_multistage[i] =
796 54 ff_vlc_init_tables(&state, 4, 8,
797 54 &ff_svq1_intra_multistage_vlc[i][0][1], 2, 1,
798 54 &ff_svq1_intra_multistage_vlc[i][0][0], 2, 1, 0);
799 54 svq1_inter_multistage[i] =
800 54 ff_vlc_init_tables(&state, 3, 8,
801 54 &ff_svq1_inter_multistage_vlc[i][0][1], 2, 1,
802 54 &ff_svq1_inter_multistage_vlc[i][0][0], 2, 1, 0);
803 }
804
805 9 VLC_INIT_STATIC_TABLE(svq1_intra_mean, 8, 256,
806 &ff_svq1_intra_mean_vlc[0][1], 4, 2,
807 &ff_svq1_intra_mean_vlc[0][0], 4, 2, 0);
808
809 9 VLC_INIT_STATIC_TABLE(svq1_inter_mean, 9, 512,
810 &ff_svq1_inter_mean_vlc[0][1], 4, 2,
811 &ff_svq1_inter_mean_vlc[0][0], 4, 2, 0);
812 9 }
813
814 15 static av_cold int svq1_decode_init(AVCodecContext *avctx)
815 {
816 static AVOnce init_static_once = AV_ONCE_INIT;
817 15 SVQ1Context *s = avctx->priv_data;
818
819 15 s->prev = av_frame_alloc();
820
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 15 if (!s->prev)
821 ✗ return AVERROR(ENOMEM);
822
823 15 s->width = avctx->width + 3 & ~3;
824 15 s->height = avctx->height + 3 & ~3;
825 15 avctx->pix_fmt = AV_PIX_FMT_YUV410P;
826
827 15 ff_hpeldsp_init(&s->hdsp, avctx->flags);
828
829 15 ff_thread_once(&init_static_once, svq1_static_init);
830
831 15 s->last_tempref = 0xFF;
832
833 15 return 0;
834 }
835
836 15 static av_cold int svq1_decode_end(AVCodecContext *avctx)
837 {
838 15 SVQ1Context *s = avctx->priv_data;
839
840 15 av_frame_free(&s->prev);
841 15 av_freep(&s->pkt_swapped);
842 15 s->pkt_swapped_allocated = 0;
843 15 av_freep(&s->pmv);
844 15 s->pmv_allocated = 0;
845
846 15 return 0;
847 }
848
849 ✗ static void svq1_flush(AVCodecContext *avctx)
850 {
851 ✗ SVQ1Context *s = avctx->priv_data;
852
853 ✗ av_frame_unref(s->prev);
854 ✗ }
855
856 const FFCodec ff_svq1_decoder = {
857 .p.name = "svq1",
858 CODEC_LONG_NAME("Sorenson Vector Quantizer 1 / Sorenson Video 1 / SVQ1"),
859 .p.type = AVMEDIA_TYPE_VIDEO,
860 .p.id = AV_CODEC_ID_SVQ1,
861 .priv_data_size = sizeof(SVQ1Context),
862 .init = svq1_decode_init,
863 .close = svq1_decode_end,
864 FF_CODEC_DECODE_CB(svq1_decode_frame),
865 .p.capabilities = AV_CODEC_CAP_DR1,
866 .flush = svq1_flush,
867 };
868