FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/svq1dec.c
Date: 2025-06-01 09:29:47
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 12347 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 12347 list[0] = pixels;
183
184 /* recursively process vector */
185
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 256068 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
186
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 475095 SVQ1_PROCESS_VECTOR();
187
188 /* destination address and vector size */
189 243721 dst = (uint32_t *)list[i];
190 243721 width = 1 << ((4 + level) / 2);
191 243721 height = 1 << ((3 + level) / 2);
192
193 /* get number of stages (-1 skips vector, 0 for mean only) */
194 243721 stages = get_vlc2(bitbuf, svq1_intra_multistage[level], 4, 2) - 1;
195
196
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 243721 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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 243350 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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 243350 av_assert0(stages >= 0);
209
210 243350 mean = get_vlc2(bitbuf, svq1_intra_mean, 8, 3);
211
212
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 243350 if (stages == 0) {
213
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 218144 for (y = 0; y < height; y++)
214 158400 memset(&dst[y * (pitch / 4)], mean, width);
215 } else {
216
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 1132723 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_intra_codebooks);
217
218
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 682056 for (y = 0; y < height; y++) {
219
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 1079292 for (x = 0; x < width / 4; x++, codebook++) {
220 580842 n1 = n4;
221 580842 n2 = n4;
222
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 3508782 SVQ1_ADD_CODEBOOK()
223 /* store result */
224 580842 dst[x] = n1 << 8 | n2;
225 }
226 498450 dst += pitch / 4;
227 }
228 }
229 }
230
231 12347 return 0;
232 }
233
234 65737 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 65737 list[0] = pixels;
250
251 /* recursively process vector */
252
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 1299784 for (i = 0, m = 1, n = 1, level = 5; i < n; i++) {
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 2402357 SVQ1_PROCESS_VECTOR();
254
255 /* destination address and vector size */
256 1234047 dst = (uint32_t *)list[i];
257 1234047 width = 1 << ((4 + level) / 2);
258 1234047 height = 1 << ((3 + level) / 2);
259
260 /* get number of stages (-1 skips vector, 0 for mean only) */
261 1234047 stages = get_vlc2(bitbuf, svq1_inter_multistage[level], 3, 2) - 1;
262
263
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 1234047 if (stages == -1)
264 29883 continue; /* skip vector */
265
266
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 1204164 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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 1204164 av_assert0(stages >= 0);
273
274 1204164 mean = get_vlc2(bitbuf, svq1_inter_mean, 9, 3) - 256;
275
276
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 1204164 if (buggy) {
277 ✗ if (mean == -128)
278 ✗ mean = 128;
279 ✗ else if (mean == 128)
280 ✗ mean = -128;
281 }
282
283
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 3372007 SVQ1_CALC_CODEBOOK_ENTRIES(ff_svq1_inter_codebooks);
284
285
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 4433444 for (y = 0; y < height; y++) {
286
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 7240728 for (x = 0; x < width / 4; x++) {
287 4011448 n3 = dst[x];
288 /* add mean value to vector */
289 4011448 n1 = n4 + ((n3 & 0xFF00FF00) >> 8);
290 4011448 n2 = n4 + (n3 & 0x00FF00FF);
291
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 9367640 SVQ1_ADD_CODEBOOK()
292 /* store result */
293 4011448 dst[x] = n1 << 8 | n2;
294
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 4011448 if (codebook != NULL)
295 3641176 codebook++;
296 }
297 3229280 dst += pitch / 4;
298 }
299 }
300 65737 return 0;
301 }
302
303 79711 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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 239133 for (i = 0; i < 2; i++) {
310 /* get motion code */
311 159422 diff = get_vlc2(bitbuf, svq1_motion_component, 7, 2);
312
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 159422 if (diff < 0)
313 ✗ return AVERROR_INVALIDDATA;
314
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 159422 else if (diff) {
315
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 79034 if (get_bits1(bitbuf))
316 34296 diff = -diff;
317 }
318
319 /* add median of motion vector predictors and clip result */
320
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 159422 if (i == 1)
321 79711 mv->y = sign_extend(diff + mid_pred(pmv[0]->y, pmv[1]->y, pmv[2]->y), 6);
322 else
323 79711 mv->x = sign_extend(diff + mid_pred(pmv[0]->x, pmv[1]->x, pmv[2]->x), 6);
324 }
325
326 79711 return 0;
327 }
328
329 7430 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 7430 src = &previous[x + y * pitch];
337 7430 dst = current;
338
339
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 126310 for (i = 0; i < 16; i++) {
340 118880 memcpy(dst, src, 16);
341 118880 src += pitch;
342 118880 dst += pitch;
343 }
344 7430 }
345
346 61079 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 61079 pmv[0] = &motion[0];
359
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 61079 if (y == 0) {
360 5028 pmv[1] =
361 5028 pmv[2] = pmv[0];
362 } else {
363 56051 pmv[1] = &motion[x / 8 + 2];
364 56051 pmv[2] = &motion[x / 8 + 4];
365 }
366
367 61079 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
368
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 61079 if (result)
369 ✗ return result;
370
371 61079 motion[0].x =
372 61079 motion[x / 8 + 2].x =
373 61079 motion[x / 8 + 3].x = mv.x;
374 61079 motion[0].y =
375 61079 motion[x / 8 + 2].y =
376 61079 motion[x / 8 + 3].y = mv.y;
377
378 61079 mv.x = av_clip(mv.x, -2 * x, 2 * (width - x - 16));
379 61079 mv.y = av_clip(mv.y, -2 * y, 2 * (height - y - 16));
380
381 61079 src = &previous[(x + (mv.x >> 1)) + (y + (mv.y >> 1)) * pitch];
382 61079 dst = current;
383
384 61079 hdsp->put_pixels_tab[0][(mv.y & 1) << 1 | (mv.x & 1)](dst, src, pitch, 16);
385
386 61079 return 0;
387 }
388
389 4658 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 4658 pmv[0] = &motion[0];
402
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 4658 if (y == 0) {
403 731 pmv[1] =
404 731 pmv[2] = pmv[0];
405 } else {
406 3927 pmv[1] = &motion[(x / 8) + 2];
407 3927 pmv[2] = &motion[(x / 8) + 4];
408 }
409
410 4658 result = svq1_decode_motion_vector(bitbuf, &mv, pmv);
411
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 4658 if (result)
412 ✗ return result;
413
414 /* predict and decode motion vector (1) */
415 4658 pmv[0] = &mv;
416
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 4658 if (y == 0) {
417 731 pmv[1] =
418 731 pmv[2] = pmv[0];
419 } else {
420 3927 pmv[1] = &motion[(x / 8) + 3];
421 }
422 4658 result = svq1_decode_motion_vector(bitbuf, &motion[0], pmv);
423
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 4658 if (result)
424 ✗ return result;
425
426 /* predict and decode motion vector (2) */
427 4658 pmv[1] = &motion[0];
428 4658 pmv[2] = &motion[(x / 8) + 1];
429
430 4658 result = svq1_decode_motion_vector(bitbuf, &motion[(x / 8) + 2], pmv);
431
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 4658 if (result)
432 ✗ return result;
433
434 /* predict and decode motion vector (3) */
435 4658 pmv[2] = &motion[(x / 8) + 2];
436 4658 pmv[3] = &motion[(x / 8) + 3];
437
438 4658 result = svq1_decode_motion_vector(bitbuf, pmv[3], pmv);
439
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 4658 if (result)
440 ✗ return result;
441
442 /* form predictions */
443
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 23290 for (i = 0; i < 4; i++) {
444 18632 int mvx = pmv[i]->x + (i & 1) * 16;
445 18632 int mvy = pmv[i]->y + (i >> 1) * 16;
446
447 // FIXME: clipping or padding?
448 18632 mvx = av_clip(mvx, -2 * x, 2 * (width - x - 8));
449 18632 mvy = av_clip(mvy, -2 * y, 2 * (height - y - 8));
450
451 18632 src = &previous[(x + (mvx >> 1)) + (y + (mvy >> 1)) * pitch];
452 18632 dst = current;
453
454 18632 hdsp->put_pixels_tab[1][((mvy & 1) << 1) | (mvx & 1)](dst, src, pitch, 8);
455
456 /* select next block */
457
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 18632 if (i & 1)
458 9316 current += 8 * (pitch - 1);
459 else
460 9316 current += 8;
461 }
462
463 4658 return 0;
464 }
465
466 76981 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 76981 int result = 0;
474
475 /* get block type */
476 76981 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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 76981 if (block_type == SVQ1_BLOCK_SKIP || block_type == SVQ1_BLOCK_INTRA) {
481 11244 motion[0].x =
482 11244 motion[0].y =
483 11244 motion[x / 8 + 2].x =
484 11244 motion[x / 8 + 2].y =
485 11244 motion[x / 8 + 3].x =
486 11244 motion[x / 8 + 3].y = 0;
487 }
488
489
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 76981 switch (block_type) {
490 7430 case SVQ1_BLOCK_SKIP:
491 7430 svq1_skip_block(current, previous, pitch, x, y);
492 7430 break;
493
494 61079 case SVQ1_BLOCK_INTER:
495 61079 result = svq1_motion_inter_block(hdsp, bitbuf, current, previous,
496 pitch, motion, x, y, width, height);
497
498
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 61079 if (result != 0) {
499 ff_dlog(avctx, "Error in svq1_motion_inter_block %i\n", result);
500 ✗ break;
501 }
502 61079 result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
503 61079 break;
504
505 4658 case SVQ1_BLOCK_INTER_4V:
506 4658 result = svq1_motion_inter_4v_block(hdsp, bitbuf, current, previous,
507 pitch, motion, x, y, width, height);
508
509
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 4658 if (result != 0) {
510 ff_dlog(avctx, "Error in svq1_motion_inter_4v_block %i\n", result);
511 ✗ break;
512 }
513 4658 result = svq1_decode_block_non_intra(bitbuf, current, pitch, buggy);
514 4658 break;
515
516 3814 case SVQ1_BLOCK_INTRA:
517 3814 result = svq1_decode_block_intra(bitbuf, current, pitch);
518 3814 break;
519 }
520
521 76981 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
539 362 static int svq1_decode_frame_header(AVCodecContext *avctx, AVFrame *frame, int * buggy)
540 {
541 362 SVQ1Context *s = avctx->priv_data;
542 362 GetBitContext *bitbuf = &s->gb;
543 int frame_size_code;
544 362 int width = s->width;
545 362 int height = s->height;
546 int tempref;
547
548 362 tempref = get_bits(bitbuf, 8); /* temporal_reference */
549
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 362 *buggy = tempref == 0 && s->last_tempref == 0 && avctx->extradata_size == 0;
550 362 s->last_tempref = tempref;
551
552 /* frame type */
553 362 s->nonref = 0;
554
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 362 switch (get_bits(bitbuf, 2)) {
555 36 case 0:
556 36 frame->pict_type = AV_PICTURE_TYPE_I;
557 36 break;
558 ✗ case 2:
559 ✗ s->nonref = 1;
560 326 case 1:
561 326 frame->pict_type = AV_PICTURE_TYPE_P;
562 326 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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 362 if (frame->pict_type == AV_PICTURE_TYPE_I) {
569 /* unknown fields */
570
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 36 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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 36 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 36 skip_bits(bitbuf, 2);
589 36 skip_bits(bitbuf, 2);
590 36 skip_bits1(bitbuf);
591
592 /* load frame size */
593 36 frame_size_code = get_bits(bitbuf, 3);
594
595
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 36 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 30 width = ff_svq1_frame_size_table[frame_size_code][0];
605 30 height = ff_svq1_frame_size_table[frame_size_code][1];
606 }
607 }
608
609 /* unknown fields */
610
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 362 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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 362 if (get_bits1(bitbuf)) {
619 162 skip_bits1(bitbuf);
620 162 skip_bits(bitbuf, 4);
621 162 skip_bits1(bitbuf);
622 162 skip_bits(bitbuf, 2);
623
624
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 162 if (skip_1stop_8data_bits(bitbuf) < 0)
625 ✗ return AVERROR_INVALIDDATA;
626 }
627
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 362 if (get_bits_left(bitbuf) <= 0)
628 ✗ return AVERROR_INVALIDDATA;
629
630 362 s->width = width;
631 362 s->height = height;
632 362 return 0;
633 }
634
635 362 static int svq1_decode_frame(AVCodecContext *avctx, AVFrame *cur,
636 int *got_frame, AVPacket *avpkt)
637 {
638 362 const uint8_t *buf = avpkt->data;
639 362 int buf_size = avpkt->size;
640 362 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 */
646 362 ret = init_get_bits8(&s->gb, buf, buf_size);
647
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 362 if (ret < 0)
648 ✗ return ret;
649
650 /* decode frame header */
651 362 s->frame_code = get_bits(&s->gb, 22);
652
653
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 362 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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 362 if (s->frame_code != 0x20) {
658 uint32_t *src;
659
660
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 10 if (buf_size < 9 * 4) {
661 ✗ av_log(avctx, AV_LOG_ERROR, "Input packet too small\n");
662 ✗ return AVERROR_INVALIDDATA;
663 }
664
665 10 av_fast_padded_malloc(&s->pkt_swapped,
666 10 &s->pkt_swapped_allocated,
667 buf_size);
668
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 10 if (!s->pkt_swapped)
669 ✗ return AVERROR(ENOMEM);
670
671 10 memcpy(s->pkt_swapped, buf, buf_size);
672 10 buf = s->pkt_swapped;
673 10 init_get_bits(&s->gb, buf, buf_size * 8);
674 10 skip_bits(&s->gb, 22);
675
676 10 src = (uint32_t *)(s->pkt_swapped + 4);
677
678
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 50 for (i = 0; i < 4; i++)
679 40 src[i] = ((src[i] << 16) | (src[i] >> 16)) ^ src[7 - i];
680 }
681
682 362 result = svq1_decode_frame_header(avctx, cur, &buggy);
683
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 362 if (result != 0) {
684 ff_dlog(avctx, "Error in svq1_decode_frame_header %i\n", result);
685 ✗ return result;
686 }
687
688 362 result = ff_set_dimensions(avctx, s->width, s->height);
689
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 362 if (result < 0)
690 ✗ return result;
691
692
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 362 if ((avctx->skip_frame >= AVDISCARD_NONREF && s->nonref) ||
693
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 362 (avctx->skip_frame >= AVDISCARD_NONKEY &&
694 ✗ cur->pict_type != AV_PICTURE_TYPE_I) ||
695
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 362 avctx->skip_frame >= AVDISCARD_ALL)
696 ✗ return buf_size;
697
698 362 result = ff_get_buffer(avctx, cur, s->nonref ? 0 : AV_GET_BUFFER_FLAG_REF);
699
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 362 if (result < 0)
700 ✗ return result;
701
702 362 av_fast_padded_malloc(&s->pmv, &s->pmv_allocated, (FFALIGN(s->width, 16) / 8 + 3) * sizeof(*s->pmv));
703
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 362 if (!s->pmv)
704 ✗ return AVERROR(ENOMEM);
705
706 /* decode y, u and v components */
707
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 1448 for (i = 0; i < 3; i++) {
708 1086 int linesize = cur->linesize[i];
709
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 1086 if (i == 0) {
710 362 width = FFALIGN(s->width, 16);
711 362 height = FFALIGN(s->height, 16);
712 } else {
713
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 724 if (avctx->flags & AV_CODEC_FLAG_GRAY)
714 ✗ break;
715 724 width = FFALIGN(s->width / 4, 16);
716 724 height = FFALIGN(s->height / 4, 16);
717 }
718
719 1086 current = cur->data[i];
720
721
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 1086 if (cur->pict_type == AV_PICTURE_TYPE_I) {
722 /* keyframe */
723
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 751 for (y = 0; y < height; y += 16) {
724
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 9176 for (x = 0; x < width; x += 16) {
725 8533 result = svq1_decode_block_intra(&s->gb, &current[x],
726 linesize);
727
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 8533 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 }
734 643 current += 16 * linesize;
735 }
736 } else {
737 /* delta frame */
738 978 uint8_t *previous = s->prev->data[i];
739
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 978 if (!previous ||
740
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 978 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
745 978 memset(s->pmv, 0, ((width / 8) + 3) * sizeof(svq1_pmv));
746
747
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 6789 for (y = 0; y < height; y += 16) {
748
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 82792 for (x = 0; x < width; x += 16) {
749 76981 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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 76981 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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 362 if (!s->nonref) {
770 362 result = av_frame_replace(s->prev, cur);
771
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 362 if (result < 0)
772 ✗ return result;
773 }
774
775 362 *got_frame = 1;
776 362 result = buf_size;
777
778 362 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