FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2dec.c
Date: 2025-07-28 20:30:09
Exec Total Coverage
Lines: 284 317 89.6%
Functions: 12 12 100.0%
Branches: 154 189 81.5%
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 "libavutil/mem_internal.h"
22
23 #include "avcodec.h"
24 #include "codec_internal.h"
25 #include "h263dec.h"
26 #include "intrax8.h"
27 #include "mathops.h"
28 #include "mpegutils.h"
29 #include "mpegvideo.h"
30 #include "mpegvideodec.h"
31 #include "msmpeg4.h"
32 #include "msmpeg4_vc1_data.h"
33 #include "msmpeg4dec.h"
34 #include "simple_idct.h"
35 #include "wmv2.h"
36 #include "wmv2data.h"
37 #include "wmv2dec.h"
38
39 typedef struct WMV2DecContext {
40 MSMP4DecContext ms;
41 WMV2Context common;
42 IntraX8Context x8;
43 int j_type_bit;
44 int j_type;
45 int abt_flag;
46 int abt_type;
47 int abt_type_table[6];
48 int per_mb_abt;
49 int per_block_abt;
50 int mspel_bit;
51 int cbp_table_index;
52 int top_left_mv_flag;
53 int per_mb_rl_bit;
54 int skip_type;
55
56 DECLARE_ALIGNED(32, int16_t, abt_block2)[6][64];
57 } WMV2DecContext;
58
59 1140894 static void wmv2_add_block(WMV2DecContext *w, int16_t blocks1[][64],
60 uint8_t *dst, int stride, int n)
61 {
62 1140894 H263DecContext *const h = &w->ms.h;
63
64
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 1140894 if (h->c.block_last_index[n] >= 0) {
65 180589 int16_t *block1 = blocks1[n];
66
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 180589 switch (w->abt_type_table[n]) {
67 149142 case 0:
68 149142 w->common.wdsp.idct_add(dst, stride, block1);
69 149142 break;
70 16469 case 1:
71 16469 ff_simple_idct84_add(dst, stride, block1);
72 16469 ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
73 16469 h->c.bdsp.clear_block(w->abt_block2[n]);
74 16469 break;
75 14978 case 2:
76 14978 ff_simple_idct48_add(dst, stride, block1);
77 14978 ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
78 14978 h->c.bdsp.clear_block(w->abt_block2[n]);
79 14978 break;
80 ✗ default:
81 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
82 }
83 }
84 1140894 }
85
86 190149 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
87 uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
88 {
89 190149 WMV2DecContext *const w = (WMV2DecContext *) s;
90
91 190149 wmv2_add_block(w, block1, dest_y, s->linesize, 0);
92 190149 wmv2_add_block(w, block1, dest_y + 8, s->linesize, 1);
93 190149 wmv2_add_block(w, block1, dest_y + 8 * s->linesize, s->linesize, 2);
94 190149 wmv2_add_block(w, block1, dest_y + 8 + 8 * s->linesize, s->linesize, 3);
95
96
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 190149 if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
97 ✗ return;
98
99 190149 wmv2_add_block(w, block1, dest_cb, s->uvlinesize, 4);
100 190149 wmv2_add_block(w, block1, dest_cr, s->uvlinesize, 5);
101 }
102
103 645 static int parse_mb_skip(WMV2DecContext *w)
104 {
105 645 H263DecContext *const h = &w->ms.h;
106 645 int coded_mb_count = 0;
107 645 uint32_t *const mb_type = h->c.cur_pic.mb_type;
108
109 645 w->skip_type = get_bits(&h->gb, 2);
110
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 645 switch (w->skip_type) {
111 230 case SKIP_TYPE_NONE:
112
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 3545 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++)
113
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 72180 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++)
114 68865 mb_type[mb_y * h->c.mb_stride + mb_x] =
115 MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
116 230 break;
117 28 case SKIP_TYPE_MPEG:
118
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 28 if (get_bits_left(&h->gb) < h->c.mb_height * h->c.mb_width)
119 ✗ return AVERROR_INVALIDDATA;
120
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 448 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++)
121
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 8820 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++)
122 8400 mb_type[mb_y * h->c.mb_stride + mb_x] =
123
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 8400 (get_bits1(&h->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
124 28 break;
125 354 case SKIP_TYPE_ROW:
126
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 5664 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++) {
127
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 5310 if (get_bits_left(&h->gb) < 1)
128 ✗ return AVERROR_INVALIDDATA;
129
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 5310 if (get_bits1(&h->gb)) {
130
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 17220 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++)
131 16400 mb_type[mb_y * h->c.mb_stride + mb_x] =
132 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
133 } else {
134
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 94290 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++)
135 89800 mb_type[mb_y * h->c.mb_stride + mb_x] =
136
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 89800 (get_bits1(&h->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
137 }
138 }
139 354 break;
140 33 case SKIP_TYPE_COL:
141
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 693 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++) {
142
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 660 if (get_bits_left(&h->gb) < 1)
143 ✗ return AVERROR_INVALIDDATA;
144
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 660 if (get_bits1(&h->gb)) {
145
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 2736 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++)
146 2565 mb_type[mb_y * h->c.mb_stride + mb_x] =
147 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
148 } else {
149
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 7824 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++)
150 7335 mb_type[mb_y * h->c.mb_stride + mb_x] =
151
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 7335 (get_bits1(&h->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
152 }
153 }
154 33 break;
155 }
156
157
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 10185 for (int mb_y = 0; mb_y < h->c.mb_height; mb_y++)
158
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 202905 for (int mb_x = 0; mb_x < h->c.mb_width; mb_x++)
159 193365 coded_mb_count += !IS_SKIP(mb_type[mb_y * h->c.mb_stride + mb_x]);
160
161
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 645 if (coded_mb_count > get_bits_left(&h->gb))
162 ✗ return AVERROR_INVALIDDATA;
163
164 645 return 0;
165 }
166
167 12 static int decode_ext_header(WMV2DecContext *w)
168 {
169 12 H263DecContext *const h = &w->ms.h;
170 GetBitContext gb;
171 int fps;
172 int code;
173
174
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 12 if (h->c.avctx->extradata_size < 4)
175 ✗ return AVERROR_INVALIDDATA;
176
177 12 init_get_bits(&gb, h->c.avctx->extradata, 32);
178
179 12 fps = get_bits(&gb, 5);
180 12 w->ms.bit_rate = get_bits(&gb, 11) * 1024;
181 12 w->mspel_bit = get_bits1(&gb);
182 12 h->loop_filter = get_bits1(&gb);
183 12 w->abt_flag = get_bits1(&gb);
184 12 w->j_type_bit = get_bits1(&gb);
185 12 w->top_left_mv_flag = get_bits1(&gb);
186 12 w->per_mb_rl_bit = get_bits1(&gb);
187 12 code = get_bits(&gb, 3);
188
189
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 12 if (code == 0)
190 ✗ return AVERROR_INVALIDDATA;
191
192 12 h->slice_height = h->c.mb_height / code;
193
194
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 12 if (h->c.avctx->debug & FF_DEBUG_PICT_INFO)
195 ✗ av_log(h->c.avctx, AV_LOG_DEBUG,
196 "fps:%d, br:%d, qpbit:%d, abt_flag:%d, j_type_bit:%d, "
197 "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
198 "slices:%d\n",
199 fps, w->ms.bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
200 w->top_left_mv_flag, w->per_mb_rl_bit, code, h->loop_filter,
201 code);
202 12 return 0;
203 }
204
205 674 static int wmv2_decode_picture_header(H263DecContext *const h)
206 {
207 int code;
208
209 674 h->c.pict_type = get_bits1(&h->gb) + 1;
210
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 674 if (h->c.pict_type == AV_PICTURE_TYPE_I) {
211 29 code = get_bits(&h->gb, 7);
212 29 av_log(h->c.avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
213 }
214 674 h->c.chroma_qscale = h->c.qscale = get_bits(&h->gb, 5);
215
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 674 if (h->c.qscale <= 0)
216 ✗ return AVERROR_INVALIDDATA;
217
218
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 674 if (h->c.pict_type != AV_PICTURE_TYPE_I && show_bits(&h->gb, 1)) {
219 387 GetBitContext gb = h->gb;
220 387 int skip_type = get_bits(&gb, 2);
221
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 387 int run = skip_type == SKIP_TYPE_COL ? h->c.mb_width : h->c.mb_height;
222
223
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 387 while (run > 0) {
224 387 int block = FFMIN(run, 25);
225
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 387 if (get_bits(&gb, block) + 1 != 1<<block)
226 387 break;
227 ✗ run -= block;
228 }
229
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 387 if (!run)
230 ✗ return FRAME_SKIPPED;
231 }
232
233 674 return 0;
234 }
235
236 674 int ff_wmv2_decode_secondary_picture_header(H263DecContext *const h)
237 {
238 674 WMV2DecContext *const w = (WMV2DecContext *)h;
239
240
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 674 if (h->c.pict_type == AV_PICTURE_TYPE_I) {
241 /* Is filling with zeroes really the right thing to do? */
242 29 memset(h->c.cur_pic.mb_type, 0,
243 29 sizeof(*h->c.cur_pic.mb_type) * h->c.mb_height * h->c.mb_stride);
244
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 29 if (w->j_type_bit)
245 29 w->j_type = get_bits1(&h->gb);
246 else
247 ✗ w->j_type = 0; // FIXME check
248
249
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 29 if (!w->j_type) {
250
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 26 if (w->per_mb_rl_bit)
251 26 w->ms.per_mb_rl_table = get_bits1(&h->gb);
252 else
253 ✗ w->ms.per_mb_rl_table = 0;
254
255
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 26 if (!w->ms.per_mb_rl_table) {
256 26 w->ms.rl_chroma_table_index = decode012(&h->gb);
257 26 w->ms.rl_table_index = decode012(&h->gb);
258 }
259
260 26 w->ms.dc_table_index = get_bits1(&h->gb);
261
262 // at minimum one bit per macroblock is required at least in a valid frame,
263 // we discard frames much smaller than this. Frames smaller than 1/8 of the
264 // smallest "black/skip" frame generally contain not much recoverable content
265 // while at the same time they have the highest computational requirements
266 // per byte
267
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 26 if (get_bits_left(&h->gb) * 8LL < (h->c.width+15)/16 * ((h->c.height+15)/16))
268 ✗ return AVERROR_INVALIDDATA;
269 }
270 29 h->c.inter_intra_pred = 0;
271 29 h->c.no_rounding = 1;
272
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 29 if (h->c.avctx->debug & FF_DEBUG_PICT_INFO) {
273 ✗ av_log(h->c.avctx, AV_LOG_DEBUG,
274 "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
275 h->c.qscale, w->ms.rl_chroma_table_index, w->ms.rl_table_index,
276 w->ms.dc_table_index, w->ms.per_mb_rl_table, w->j_type);
277 }
278 } else {
279 int cbp_index;
280 int ret;
281 645 w->j_type = 0;
282
283 645 ret = parse_mb_skip(w);
284
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 645 if (ret < 0)
285 ✗ return ret;
286 645 cbp_index = decode012(&h->gb);
287 645 w->cbp_table_index = wmv2_get_cbp_table_index(h->c.qscale, cbp_index);
288
289
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 645 if (w->mspel_bit)
290 645 h->c.mspel = get_bits1(&h->gb);
291 else
292 ✗ h->c.mspel = 0; // FIXME check
293
294
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 645 if (w->abt_flag) {
295 645 w->per_mb_abt = get_bits1(&h->gb) ^ 1;
296
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 645 if (!w->per_mb_abt)
297 187 w->abt_type = decode012(&h->gb);
298 }
299
300
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 645 if (w->per_mb_rl_bit)
301 645 w->ms.per_mb_rl_table = get_bits1(&h->gb);
302 else
303 ✗ w->ms.per_mb_rl_table = 0;
304
305
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 645 if (!w->ms.per_mb_rl_table) {
306 617 w->ms.rl_table_index = decode012(&h->gb);
307 617 w->ms.rl_chroma_table_index = w->ms.rl_table_index;
308 }
309
310
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 645 if (get_bits_left(&h->gb) < 2)
311 ✗ return AVERROR_INVALIDDATA;
312
313 645 w->ms.dc_table_index = get_bits1(&h->gb);
314 645 w->ms.mv_table_index = get_bits1(&h->gb);
315
316 645 h->c.inter_intra_pred = 0; // (h->c.width * h->c.height < 320 * 240 && w->ms.bit_rate <= II_BITRATE);
317 645 h->c.no_rounding ^= 1;
318
319
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 645 if (h->c.avctx->debug & FF_DEBUG_PICT_INFO) {
320 ✗ av_log(h->c.avctx, AV_LOG_DEBUG,
321 "rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d mspel:%d "
322 "per_mb_abt:%d abt_type:%d cbp:%d ii:%d\n",
323 w->ms.rl_table_index, w->ms.rl_chroma_table_index,
324 w->ms.dc_table_index, w->ms.mv_table_index,
325 w->ms.per_mb_rl_table, h->c.qscale, h->c.mspel,
326 w->per_mb_abt, w->abt_type, w->cbp_table_index,
327 h->c.inter_intra_pred);
328 }
329 }
330 674 w->ms.esc3_level_length = 0;
331 674 w->ms.esc3_run_length = 0;
332
333
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 674 if (w->j_type) {
334 3 ff_intrax8_decode_picture(&w->x8, h->c.cur_pic.ptr,
335 &h->gb, &h->c.mb_x, &h->c.mb_y,
336 3 2 * h->c.qscale, (h->c.qscale - 1) | 1,
337 h->loop_filter, h->c.low_delay);
338
339 3 ff_er_add_slice(&h->c.er, 0, 0,
340 3 (h->c.mb_x >> 1) - 1, (h->c.mb_y >> 1) - 1,
341 ER_MB_END);
342 3 return 1;
343 }
344
345 671 return 0;
346 }
347
348 118424 static inline void wmv2_decode_motion(WMV2DecContext *w, int *mx_ptr, int *my_ptr)
349 {
350 118424 H263DecContext *const h = &w->ms.h;
351
352 118424 ff_msmpeg4_decode_motion(&w->ms, mx_ptr, my_ptr);
353
354
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 118424 if ((((*mx_ptr) | (*my_ptr)) & 1) && h->c.mspel)
355 19528 w->common.hshift = get_bits1(&h->gb);
356 else
357 98896 w->common.hshift = 0;
358 118424 }
359
360 118424 static int16_t *wmv2_pred_motion(WMV2DecContext *w, int *px, int *py)
361 {
362 118424 H263DecContext *const h = &w->ms.h;
363 int diff, type;
364
365 118424 int wrap = h->c.b8_stride;
366 118424 int xy = h->c.block_index[0];
367
368 118424 int16_t *mot_val = h->c.cur_pic.motion_val[0][xy];
369
370 118424 const int16_t *A = h->c.cur_pic.motion_val[0][xy - 1];
371 118424 const int16_t *B = h->c.cur_pic.motion_val[0][xy - wrap];
372 118424 const int16_t *C = h->c.cur_pic.motion_val[0][xy + 2 - wrap];
373
374
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 118424 if (h->c.mb_x && !h->c.first_slice_line && !h->c.mspel && w->top_left_mv_flag)
375 22431 diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
376 else
377 95993 diff = 0;
378
379
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 118424 if (diff >= 8)
380 3203 type = get_bits1(&h->gb);
381 else
382 115221 type = 2;
383
384
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 118424 if (type == 0) {
385 1698 *px = A[0];
386 1698 *py = A[1];
387
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 116726 } else if (type == 1) {
388 1505 *px = B[0];
389 1505 *py = B[1];
390 } else {
391 /* special case for first (slice) line */
392
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 115221 if (h->c.first_slice_line) {
393 4281 *px = A[0];
394 4281 *py = A[1];
395 } else {
396 110940 *px = mid_pred(A[0], B[0], C[0]);
397 110940 *py = mid_pred(A[1], B[1], C[1]);
398 }
399 }
400
401 118424 return mot_val;
402 }
403
404 710544 static inline int wmv2_decode_inter_block(WMV2DecContext *w, int16_t *block,
405 int n, int cbp)
406 {
407 710544 H263DecContext *const h = &w->ms.h;
408 static const int sub_cbp_table[3] = { 2, 3, 1 };
409 int sub_cbp, ret;
410
411
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 710544 if (!cbp) {
412 529955 h->c.block_last_index[n] = -1;
413 529955 return 0;
414 }
415
416
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 180589 if (w->per_block_abt)
417 20828 w->abt_type = decode012(&h->gb);
418 180589 w->abt_type_table[n] = w->abt_type;
419
420
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 180589 if (w->abt_type) {
421
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 31447 const uint8_t *scantable = w->abt_type == 1 ? ff_wmv2_scantableA : ff_wmv2_scantableB;
422
423 31447 sub_cbp = sub_cbp_table[decode012(&h->gb)];
424
425
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 31447 if (sub_cbp & 1) {
426 18950 ret = ff_msmpeg4_decode_block(&w->ms, block, n, 1, scantable);
427
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 18950 if (ret < 0)
428 ✗ return ret;
429 }
430
431
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 31447 if (sub_cbp & 2) {
432 19090 ret = ff_msmpeg4_decode_block(&w->ms, w->abt_block2[n], n, 1, scantable);
433
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 19090 if (ret < 0)
434 ✗ return ret;
435 }
436
437 31447 h->c.block_last_index[n] = 63;
438
439 31447 return 0;
440 } else {
441 149142 return ff_msmpeg4_decode_block(&w->ms, block, n, 1,
442 149142 h->c.inter_scantable.permutated);
443 }
444 }
445
446 201150 static int wmv2_decode_mb(H263DecContext *const h)
447 {
448 /* The following is only allowed because this decoder
449 * does not use slice threading. */
450 201150 WMV2DecContext *const w = (WMV2DecContext *) h;
451 201150 MSMP4DecContext *const ms = &w->ms;
452 int cbp, code, i, ret;
453 uint8_t *coded_val;
454
455
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 201150 if (w->j_type)
456 ✗ return 0;
457
458
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 201150 if (h->c.pict_type == AV_PICTURE_TYPE_P) {
459
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 193365 if (IS_SKIP(h->c.cur_pic.mb_type[h->c.mb_y * h->c.mb_stride + h->c.mb_x])) {
460 /* skip mb */
461 71725 h->c.mb_intra = 0;
462
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 502075 for (i = 0; i < 6; i++)
463 430350 h->c.block_last_index[i] = -1;
464 71725 h->c.mv_dir = MV_DIR_FORWARD;
465 71725 h->c.mv_type = MV_TYPE_16X16;
466 71725 h->c.mv[0][0][0] = 0;
467 71725 h->c.mv[0][0][1] = 0;
468 71725 h->c.mb_skipped = 1;
469 71725 w->common.hshift = 0;
470 71725 return 0;
471 }
472
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 121640 if (get_bits_left(&h->gb) <= 0)
473 ✗ return AVERROR_INVALIDDATA;
474
475 121640 code = get_vlc2(&h->gb, ff_mb_non_intra_vlc[w->cbp_table_index],
476 MB_NON_INTRA_VLC_BITS, 3);
477 121640 h->c.mb_intra = (~code & 0x40) >> 6;
478
479 121640 cbp = code & 0x3f;
480 } else {
481 7785 h->c.mb_intra = 1;
482
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 7785 if (get_bits_left(&h->gb) <= 0)
483 ✗ return AVERROR_INVALIDDATA;
484 7785 code = get_vlc2(&h->gb, ff_msmp4_mb_i_vlc,
485 MSMP4_MB_INTRA_VLC_BITS, 2);
486 /* predict coded block pattern */
487 7785 cbp = 0;
488
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 54495 for (i = 0; i < 6; i++) {
489 46710 int val = ((code >> (5 - i)) & 1);
490
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 46710 if (i < 4) {
491 31140 int pred = ff_msmpeg4_coded_block_pred(&h->c, i, &coded_val);
492 31140 val = val ^ pred;
493 31140 *coded_val = val;
494 }
495 46710 cbp |= val << (5 - i);
496 }
497 }
498
499
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 129425 if (!h->c.mb_intra) {
500 int mx, my;
501 118424 wmv2_pred_motion(w, &mx, &my);
502
503
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 118424 if (cbp) {
504 76773 h->c.bdsp.clear_blocks(h->block[0]);
505
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 76773 if (ms->per_mb_rl_table) {
506 1656 ms->rl_table_index = decode012(&h->gb);
507 1656 ms->rl_chroma_table_index = ms->rl_table_index;
508 }
509
510
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 76773 if (w->abt_flag && w->per_mb_abt) {
511 37493 w->per_block_abt = get_bits1(&h->gb);
512
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 37493 if (!w->per_block_abt)
513 30618 w->abt_type = decode012(&h->gb);
514 } else
515 39280 w->per_block_abt = 0;
516 }
517
518 118424 wmv2_decode_motion(w, &mx, &my);
519
520 118424 h->c.mv_dir = MV_DIR_FORWARD;
521 118424 h->c.mv_type = MV_TYPE_16X16;
522 118424 h->c.mv[0][0][0] = mx;
523 118424 h->c.mv[0][0][1] = my;
524
525
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 828968 for (i = 0; i < 6; i++) {
526
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 710544 if ((ret = wmv2_decode_inter_block(w, h->block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
527 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
528 "\nerror while decoding inter block: %d x %d (%d)\n",
529 h->c.mb_x, h->c.mb_y, i);
530 ✗ return ret;
531 }
532 }
533 } else {
534 11001 if (h->c.pict_type == AV_PICTURE_TYPE_P)
535 ff_dlog(h->c.avctx, "%d%d ", h->c.inter_intra_pred, cbp);
536 ff_dlog(h->c.avctx, "I at %d %d %d %06X\n", h->c.mb_x, h->c.mb_y,
537 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
538 show_bits(&h->gb, 24));
539 11001 h->c.ac_pred = get_bits1(&h->gb);
540
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 11001 if (h->c.inter_intra_pred) {
541 ✗ h->c.h263_aic_dir = get_vlc2(&h->gb, ff_inter_intra_vlc,
542 INTER_INTRA_VLC_BITS, 1);
543 ff_dlog(h->c.avctx, "%d%d %d %d/",
544 h->c.ac_pred, h->c.h263_aic_dir, h->c.mb_x, h->c.mb_y);
545 }
546
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 11001 if (ms->per_mb_rl_table && cbp) {
547 128 ms->rl_table_index = decode012(&h->gb);
548 128 ms->rl_chroma_table_index = ms->rl_table_index;
549 }
550
551 11001 h->c.bdsp.clear_blocks(h->block[0]);
552
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 77007 for (i = 0; i < 6; i++) {
553 66006 ret = ff_msmpeg4_decode_block(ms, h->block[i], i, (cbp >> (5 - i)) & 1, NULL);
554
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 66006 if (ret < 0) {
555 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
556 "\nerror while decoding intra block: %d x %d (%d)\n",
557 h->c.mb_x, h->c.mb_y, i);
558 ✗ return ret;
559 }
560 }
561 }
562
563 129425 return 0;
564 }
565
566 12 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
567 {
568 12 WMV2DecContext *const w = avctx->priv_data;
569 12 H263DecContext *const h = &w->ms.h;
570 12 MpegEncContext *const s = &h->c;
571 int ret;
572
573 12 s->private_ctx = &w->common;
574
575
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 12 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
576 ✗ return ret;
577
578 12 h->decode_header = wmv2_decode_picture_header;
579 12 h->decode_mb = wmv2_decode_mb;
580
581 12 ff_wmv2_common_init(s);
582
583 12 decode_ext_header(w);
584
585 12 return ff_intrax8_common_init(avctx, &w->x8, h->block[0],
586 s->mb_width, s->mb_height);
587 }
588
589 12 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
590 {
591 12 WMV2DecContext *const w = avctx->priv_data;
592
593 12 ff_intrax8_common_end(&w->x8);
594 12 return ff_mpv_decode_close(avctx);
595 }
596
597 const FFCodec ff_wmv2_decoder = {
598 .p.name = "wmv2",
599 CODEC_LONG_NAME("Windows Media Video 8"),
600 .p.type = AVMEDIA_TYPE_VIDEO,
601 .p.id = AV_CODEC_ID_WMV2,
602 .priv_data_size = sizeof(WMV2DecContext),
603 .init = wmv2_decode_init,
604 .close = wmv2_decode_end,
605 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
606 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
607 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
608 };
609