FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2dec.c
Date: 2021-09-26 18:22:30
Exec Total Coverage
Lines: 249 279 89.2%
Branches: 148 181 81.8%

Line Branch Exec Source
1 /*
2 * Copyright (c) 2002 The FFmpeg Project
3 *
4 * This file is part of FFmpeg.
5 *
6 * FFmpeg is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU Lesser General Public
8 * License as published by the Free Software Foundation; either
9 * version 2.1 of the License, or (at your option) any later version.
10 *
11 * FFmpeg is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
14 * Lesser General Public License for more details.
15 *
16 * You should have received a copy of the GNU Lesser General Public
17 * License along with FFmpeg; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "avcodec.h"
22 #include "h263.h"
23 #include "internal.h"
24 #include "intrax8.h"
25 #include "mathops.h"
26 #include "mpegutils.h"
27 #include "mpegvideo.h"
28 #include "msmpeg4.h"
29 #include "msmpeg4data.h"
30 #include "wmv2.h"
31
32
33 645 static int parse_mb_skip(Wmv2Context *w)
34 {
35 int mb_x, mb_y;
36 645 int coded_mb_count = 0;
37 645 MpegEncContext *const s = &w->s;
38 645 uint32_t *const mb_type = s->current_picture_ptr->mb_type;
39
40 645 w->skip_type = get_bits(&s->gb, 2);
41
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645 switch (w->skip_type) {
42 230 case SKIP_TYPE_NONE:
43
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3545 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
44
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72180 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
45 68865 mb_type[mb_y * s->mb_stride + mb_x] =
46 MB_TYPE_16x16 | MB_TYPE_L0;
47 230 break;
48 28 case SKIP_TYPE_MPEG:
49
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28 if (get_bits_left(&s->gb) < s->mb_height * s->mb_width)
50 return AVERROR_INVALIDDATA;
51
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448 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
52
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8820 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
53 8400 mb_type[mb_y * s->mb_stride + mb_x] =
54
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8400 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
55 28 break;
56 354 case SKIP_TYPE_ROW:
57
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5664 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
58
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5310 if (get_bits_left(&s->gb) < 1)
59 return AVERROR_INVALIDDATA;
60
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5310 if (get_bits1(&s->gb)) {
61
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17220 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
62 16400 mb_type[mb_y * s->mb_stride + mb_x] =
63 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
64 } else {
65
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94290 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
66 89800 mb_type[mb_y * s->mb_stride + mb_x] =
67
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89800 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
68 }
69 }
70 354 break;
71 33 case SKIP_TYPE_COL:
72
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693 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
73
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660 if (get_bits_left(&s->gb) < 1)
74 return AVERROR_INVALIDDATA;
75
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660 if (get_bits1(&s->gb)) {
76
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2736 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
77 2565 mb_type[mb_y * s->mb_stride + mb_x] =
78 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
79 } else {
80
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7824 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
81 7335 mb_type[mb_y * s->mb_stride + mb_x] =
82
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7335 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
83 }
84 }
85 33 break;
86 }
87
88
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10185 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
89
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202905 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
90 193365 coded_mb_count += !IS_SKIP(mb_type[mb_y * s->mb_stride + mb_x]);
91
92
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645 if (coded_mb_count > get_bits_left(&s->gb))
93 return AVERROR_INVALIDDATA;
94
95 645 return 0;
96 }
97
98 5 static int decode_ext_header(Wmv2Context *w)
99 {
100 5 MpegEncContext *const s = &w->s;
101 GetBitContext gb;
102 int fps;
103 int code;
104
105
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5 if (s->avctx->extradata_size < 4)
106 return AVERROR_INVALIDDATA;
107
108 5 init_get_bits(&gb, s->avctx->extradata, 32);
109
110 5 fps = get_bits(&gb, 5);
111 5 s->bit_rate = get_bits(&gb, 11) * 1024;
112 5 w->mspel_bit = get_bits1(&gb);
113 5 s->loop_filter = get_bits1(&gb);
114 5 w->abt_flag = get_bits1(&gb);
115 5 w->j_type_bit = get_bits1(&gb);
116 5 w->top_left_mv_flag = get_bits1(&gb);
117 5 w->per_mb_rl_bit = get_bits1(&gb);
118 5 code = get_bits(&gb, 3);
119
120
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5 if (code == 0)
121 return AVERROR_INVALIDDATA;
122
123 5 s->slice_height = s->mb_height / code;
124
125
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5 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
126 av_log(s->avctx, AV_LOG_DEBUG,
127 "fps:%d, br:%"PRId64", qpbit:%d, abt_flag:%d, j_type_bit:%d, "
128 "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
129 "slices:%d\n",
130 fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
131 w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
132 code);
133 5 return 0;
134 }
135
136 674 int ff_wmv2_decode_picture_header(MpegEncContext *s)
137 {
138 674 Wmv2Context *const w = (Wmv2Context *) s;
139 int code;
140
141
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674 if (s->picture_number == 0)
142 5 decode_ext_header(w);
143
144 674 s->pict_type = get_bits1(&s->gb) + 1;
145
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674 if (s->pict_type == AV_PICTURE_TYPE_I) {
146 29 code = get_bits(&s->gb, 7);
147 29 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
148 }
149 674 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
150
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674 if (s->qscale <= 0)
151 return AVERROR_INVALIDDATA;
152
153
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674 if (s->pict_type != AV_PICTURE_TYPE_I && show_bits(&s->gb, 1)) {
154 387 GetBitContext gb = s->gb;
155 387 int skip_type = get_bits(&gb, 2);
156
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387 int run = skip_type == SKIP_TYPE_COL ? s->mb_width : s->mb_height;
157
158
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387 while (run > 0) {
159 387 int block = FFMIN(run, 25);
160
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387 if (get_bits(&gb, block) + 1 != 1<<block)
161 387 break;
162 run -= block;
163 }
164
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387 if (!run)
165 return FRAME_SKIPPED;
166 }
167
168 674 return 0;
169 }
170
171 674 int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
172 {
173 674 Wmv2Context *const w = (Wmv2Context *) s;
174
175
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674 if (s->pict_type == AV_PICTURE_TYPE_I) {
176
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29 if (w->j_type_bit)
177 29 w->j_type = get_bits1(&s->gb);
178 else
179 w->j_type = 0; // FIXME check
180
181
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29 if (!w->j_type) {
182
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26 if (w->per_mb_rl_bit)
183 26 s->per_mb_rl_table = get_bits1(&s->gb);
184 else
185 s->per_mb_rl_table = 0;
186
187
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26 if (!s->per_mb_rl_table) {
188 26 s->rl_chroma_table_index = decode012(&s->gb);
189 26 s->rl_table_index = decode012(&s->gb);
190 }
191
192 26 s->dc_table_index = get_bits1(&s->gb);
193
194 // at minimum one bit per macroblock is required at least in a valid frame,
195 // we discard frames much smaller than this. Frames smaller than 1/8 of the
196 // smallest "black/skip" frame generally contain not much recoverable content
197 // while at the same time they have the highest computational requirements
198 // per byte
199
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26 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
200 return AVERROR_INVALIDDATA;
201 }
202 29 s->inter_intra_pred = 0;
203 29 s->no_rounding = 1;
204
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29 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
205 av_log(s->avctx, AV_LOG_DEBUG,
206 "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
207 s->qscale, s->rl_chroma_table_index, s->rl_table_index,
208 s->dc_table_index, s->per_mb_rl_table, w->j_type);
209 }
210 } else {
211 int cbp_index;
212 int ret;
213 645 w->j_type = 0;
214
215 645 ret = parse_mb_skip(w);
216
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645 if (ret < 0)
217 return ret;
218 645 cbp_index = decode012(&s->gb);
219 645 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
220
221
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645 if (w->mspel_bit)
222 645 s->mspel = get_bits1(&s->gb);
223 else
224 s->mspel = 0; // FIXME check
225
226
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645 if (w->abt_flag) {
227 645 w->per_mb_abt = get_bits1(&s->gb) ^ 1;
228
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645 if (!w->per_mb_abt)
229 187 w->abt_type = decode012(&s->gb);
230 }
231
232
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645 if (w->per_mb_rl_bit)
233 645 s->per_mb_rl_table = get_bits1(&s->gb);
234 else
235 s->per_mb_rl_table = 0;
236
237
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645 if (!s->per_mb_rl_table) {
238 617 s->rl_table_index = decode012(&s->gb);
239 617 s->rl_chroma_table_index = s->rl_table_index;
240 }
241
242
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645 if (get_bits_left(&s->gb) < 2)
243 return AVERROR_INVALIDDATA;
244
245 645 s->dc_table_index = get_bits1(&s->gb);
246 645 s->mv_table_index = get_bits1(&s->gb);
247
248 645 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
249 645 s->no_rounding ^= 1;
250
251
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645 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
252 av_log(s->avctx, AV_LOG_DEBUG,
253 "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
254 "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
255 s->rl_table_index, s->rl_chroma_table_index,
256 s->dc_table_index, s->mv_table_index,
257 s->per_mb_rl_table, s->qscale, s->mspel,
258 w->per_mb_abt, w->abt_type, w->cbp_table_index,
259 s->inter_intra_pred);
260 }
261 }
262 674 s->esc3_level_length = 0;
263 674 s->esc3_run_length = 0;
264 674 s->picture_number++; // FIXME ?
265
266
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674 if (w->j_type) {
267 3 ff_intrax8_decode_picture(&w->x8, &s->current_picture,
268 &s->gb, &s->mb_x, &s->mb_y,
269 3 2 * s->qscale, (s->qscale - 1) | 1,
270 s->loop_filter, s->low_delay);
271
272 3 ff_er_add_slice(&w->s.er, 0, 0,
273 3 (w->s.mb_x >> 1) - 1, (w->s.mb_y >> 1) - 1,
274 ER_MB_END);
275 3 return 1;
276 }
277
278 671 return 0;
279 }
280
281 118424 static inline void wmv2_decode_motion(Wmv2Context *w, int *mx_ptr, int *my_ptr)
282 {
283 118424 MpegEncContext *const s = &w->s;
284
285 118424 ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
286
287
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118424 if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
288 19528 w->hshift = get_bits1(&s->gb);
289 else
290 98896 w->hshift = 0;
291 118424 }
292
293 118424 static int16_t *wmv2_pred_motion(Wmv2Context *w, int *px, int *py)
294 {
295 118424 MpegEncContext *const s = &w->s;
296 int xy, wrap, diff, type;
297 int16_t *A, *B, *C, *mot_val;
298
299 118424 wrap = s->b8_stride;
300 118424 xy = s->block_index[0];
301
302 118424 mot_val = s->current_picture.motion_val[0][xy];
303
304 118424 A = s->current_picture.motion_val[0][xy - 1];
305 118424 B = s->current_picture.motion_val[0][xy - wrap];
306 118424 C = s->current_picture.motion_val[0][xy + 2 - wrap];
307
308
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118424 if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
309 22431 diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
310 else
311 95993 diff = 0;
312
313
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118424 if (diff >= 8)
314 3203 type = get_bits1(&s->gb);
315 else
316 115221 type = 2;
317
318
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118424 if (type == 0) {
319 1698 *px = A[0];
320 1698 *py = A[1];
321
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116726 } else if (type == 1) {
322 1505 *px = B[0];
323 1505 *py = B[1];
324 } else {
325 /* special case for first (slice) line */
326
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115221 if (s->first_slice_line) {
327 4281 *px = A[0];
328 4281 *py = A[1];
329 } else {
330 110940 *px = mid_pred(A[0], B[0], C[0]);
331 110940 *py = mid_pred(A[1], B[1], C[1]);
332 }
333 }
334
335 118424 return mot_val;
336 }
337
338 710544 static inline int wmv2_decode_inter_block(Wmv2Context *w, int16_t *block,
339 int n, int cbp)
340 {
341 710544 MpegEncContext *const s = &w->s;
342 static const int sub_cbp_table[3] = { 2, 3, 1 };
343 int sub_cbp, ret;
344
345
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710544 if (!cbp) {
346 529955 s->block_last_index[n] = -1;
347 529955 return 0;
348 }
349
350
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180589 if (w->per_block_abt)
351 20828 w->abt_type = decode012(&s->gb);
352 180589 w->abt_type_table[n] = w->abt_type;
353
354
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180589 if (w->abt_type) {
355 // const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].permutated;
356 31447 const uint8_t *scantable = w->abt_scantable[w->abt_type - 1].scantable;
357 // const uint8_t *scantable = w->abt_type - 1 ? w->abt_scantable[1].permutated : w->abt_scantable[0].scantable;
358
359 31447 sub_cbp = sub_cbp_table[decode012(&s->gb)];
360
361
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31447 if (sub_cbp & 1)
362
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18950 if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
363 return ret;
364
365
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31447 if (sub_cbp & 2)
366
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19090 if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
367 return ret;
368
369 31447 s->block_last_index[n] = 63;
370
371 31447 return 0;
372 } else {
373 149142 return ff_msmpeg4_decode_block(s, block, n, 1,
374 149142 s->inter_scantable.permutated);
375 }
376 }
377
378 201150 int ff_wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
379 {
380 201150 Wmv2Context *const w = (Wmv2Context *) s;
381 int cbp, code, i, ret;
382 uint8_t *coded_val;
383
384
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201150 if (w->j_type)
385 return 0;
386
387
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201150 if (s->pict_type == AV_PICTURE_TYPE_P) {
388
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193365 if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
389 /* skip mb */
390 71725 s->mb_intra = 0;
391
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502075 for (i = 0; i < 6; i++)
392 430350 s->block_last_index[i] = -1;
393 71725 s->mv_dir = MV_DIR_FORWARD;
394 71725 s->mv_type = MV_TYPE_16X16;
395 71725 s->mv[0][0][0] = 0;
396 71725 s->mv[0][0][1] = 0;
397 71725 s->mb_skipped = 1;
398 71725 w->hshift = 0;
399 71725 return 0;
400 }
401
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121640 if (get_bits_left(&s->gb) <= 0)
402 return AVERROR_INVALIDDATA;
403
404 121640 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index].table,
405 MB_NON_INTRA_VLC_BITS, 3);
406 121640 s->mb_intra = (~code & 0x40) >> 6;
407
408 121640 cbp = code & 0x3f;
409 } else {
410 7785 s->mb_intra = 1;
411
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7785 if (get_bits_left(&s->gb) <= 0)
412 return AVERROR_INVALIDDATA;
413 7785 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc.table, MB_INTRA_VLC_BITS, 2);
414 /* predict coded block pattern */
415 7785 cbp = 0;
416
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54495 for (i = 0; i < 6; i++) {
417 46710 int val = ((code >> (5 - i)) & 1);
418
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46710 if (i < 4) {
419 31140 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
420 31140 val = val ^ pred;
421 31140 *coded_val = val;
422 }
423 46710 cbp |= val << (5 - i);
424 }
425 }
426
427
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129425 if (!s->mb_intra) {
428 int mx, my;
429 118424 wmv2_pred_motion(w, &mx, &my);
430
431
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118424 if (cbp) {
432 76773 s->bdsp.clear_blocks(s->block[0]);
433
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76773 if (s->per_mb_rl_table) {
434 1656 s->rl_table_index = decode012(&s->gb);
435 1656 s->rl_chroma_table_index = s->rl_table_index;
436 }
437
438
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76773 if (w->abt_flag && w->per_mb_abt) {
439 37493 w->per_block_abt = get_bits1(&s->gb);
440
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37493 if (!w->per_block_abt)
441 30618 w->abt_type = decode012(&s->gb);
442 } else
443 39280 w->per_block_abt = 0;
444 }
445
446 118424 wmv2_decode_motion(w, &mx, &my);
447
448 118424 s->mv_dir = MV_DIR_FORWARD;
449 118424 s->mv_type = MV_TYPE_16X16;
450 118424 s->mv[0][0][0] = mx;
451 118424 s->mv[0][0][1] = my;
452
453
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828968 for (i = 0; i < 6; i++) {
454
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710544 if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
455 av_log(s->avctx, AV_LOG_ERROR,
456 "\nerror while decoding inter block: %d x %d (%d)\n",
457 s->mb_x, s->mb_y, i);
458 return ret;
459 }
460 }
461 } else {
462 11001 if (s->pict_type == AV_PICTURE_TYPE_P)
463 ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
464 ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
465 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
466 show_bits(&s->gb, 24));
467 11001 s->ac_pred = get_bits1(&s->gb);
468
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11001 if (s->inter_intra_pred) {
469 s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc.table,
470 INTER_INTRA_VLC_BITS, 1);
471 ff_dlog(s->avctx, "%d%d %d %d/",
472 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
473 }
474
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11001 if (s->per_mb_rl_table && cbp) {
475 128 s->rl_table_index = decode012(&s->gb);
476 128 s->rl_chroma_table_index = s->rl_table_index;
477 }
478
479 11001 s->bdsp.clear_blocks(s->block[0]);
480
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77007 for (i = 0; i < 6; i++) {
481
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66006 if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
482 av_log(s->avctx, AV_LOG_ERROR,
483 "\nerror while decoding intra block: %d x %d (%d)\n",
484 s->mb_x, s->mb_y, i);
485 return ret;
486 }
487 }
488 }
489
490 129425 return 0;
491 }
492
493 12 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
494 {
495 12 Wmv2Context *const w = avctx->priv_data;
496 int ret;
497
498
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12 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
499 return ret;
500
501 12 ff_wmv2_common_init(w);
502
503 12 return ff_intrax8_common_init(avctx, &w->x8, &w->s.idsp,
504 12 w->s.block, w->s.block_last_index,
505 w->s.mb_width, w->s.mb_height);
506 }
507
508 12 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
509 {
510 12 Wmv2Context *w = avctx->priv_data;
511
512 12 ff_intrax8_common_end(&w->x8);
513 12 return ff_h263_decode_end(avctx);
514 }
515
516 const AVCodec ff_wmv2_decoder = {
517 .name = "wmv2",
518 .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
519 .type = AVMEDIA_TYPE_VIDEO,
520 .id = AV_CODEC_ID_WMV2,
521 .priv_data_size = sizeof(Wmv2Context),
522 .init = wmv2_decode_init,
523 .close = wmv2_decode_end,
524 .decode = ff_h263_decode_frame,
525 .capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
526 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
527 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
528 AV_PIX_FMT_NONE },
529 };
530