FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2dec.c
Date: 2024-04-25 15:36:26
Exec Total Coverage
Lines: 278 311 89.4%
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 "msmpeg4.h"
31 #include "msmpeg4_vc1_data.h"
32 #include "msmpeg4dec.h"
33 #include "simple_idct.h"
34 #include "wmv2.h"
35 #include "wmv2data.h"
36 #include "wmv2dec.h"
37
38 typedef struct WMV2DecContext {
39 MpegEncContext s;
40 WMV2Context common;
41 IntraX8Context x8;
42 int j_type_bit;
43 int j_type;
44 int abt_flag;
45 int abt_type;
46 int abt_type_table[6];
47 int per_mb_abt;
48 int per_block_abt;
49 int mspel_bit;
50 int cbp_table_index;
51 int top_left_mv_flag;
52 int per_mb_rl_bit;
53 int skip_type;
54
55 DECLARE_ALIGNED(32, int16_t, abt_block2)[6][64];
56 } WMV2DecContext;
57
58 1140894 static void wmv2_add_block(WMV2DecContext *w, int16_t *block1,
59 uint8_t *dst, int stride, int n)
60 {
61 1140894 MpegEncContext *const s = &w->s;
62
63
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 1140894 if (s->block_last_index[n] >= 0) {
64
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 180589 switch (w->abt_type_table[n]) {
65 149142 case 0:
66 149142 w->common.wdsp.idct_add(dst, stride, block1);
67 149142 break;
68 16469 case 1:
69 16469 ff_simple_idct84_add(dst, stride, block1);
70 16469 ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
71 16469 s->bdsp.clear_block(w->abt_block2[n]);
72 16469 break;
73 14978 case 2:
74 14978 ff_simple_idct48_add(dst, stride, block1);
75 14978 ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
76 14978 s->bdsp.clear_block(w->abt_block2[n]);
77 14978 break;
78 ✗ default:
79 ✗ av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
80 }
81 }
82 1140894 }
83
84 190149 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
85 uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
86 {
87 190149 WMV2DecContext *const w = (WMV2DecContext *) s;
88
89 190149 wmv2_add_block(w, block1[0], dest_y, s->linesize, 0);
90 190149 wmv2_add_block(w, block1[1], dest_y + 8, s->linesize, 1);
91 190149 wmv2_add_block(w, block1[2], dest_y + 8 * s->linesize, s->linesize, 2);
92 190149 wmv2_add_block(w, block1[3], dest_y + 8 + 8 * s->linesize, s->linesize, 3);
93
94
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 190149 if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
95 ✗ return;
96
97 190149 wmv2_add_block(w, block1[4], dest_cb, s->uvlinesize, 4);
98 190149 wmv2_add_block(w, block1[5], dest_cr, s->uvlinesize, 5);
99 }
100
101 645 static int parse_mb_skip(WMV2DecContext *w)
102 {
103 int mb_x, mb_y;
104 645 int coded_mb_count = 0;
105 645 MpegEncContext *const s = &w->s;
106 645 uint32_t *const mb_type = s->current_picture_ptr->mb_type;
107
108 645 w->skip_type = get_bits(&s->gb, 2);
109
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 645 switch (w->skip_type) {
110 230 case SKIP_TYPE_NONE:
111
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 3545 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
112
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 72180 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
113 68865 mb_type[mb_y * s->mb_stride + mb_x] =
114 MB_TYPE_16x16 | MB_TYPE_L0;
115 230 break;
116 28 case SKIP_TYPE_MPEG:
117
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 28 if (get_bits_left(&s->gb) < s->mb_height * s->mb_width)
118 ✗ return AVERROR_INVALIDDATA;
119
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 448 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
120
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 8820 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
121 8400 mb_type[mb_y * s->mb_stride + mb_x] =
122
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 8400 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
123 28 break;
124 354 case SKIP_TYPE_ROW:
125
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 5664 for (mb_y = 0; mb_y < s->mb_height; mb_y++) {
126
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 5310 if (get_bits_left(&s->gb) < 1)
127 ✗ return AVERROR_INVALIDDATA;
128
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 5310 if (get_bits1(&s->gb)) {
129
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 17220 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
130 16400 mb_type[mb_y * s->mb_stride + mb_x] =
131 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
132 } else {
133
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 94290 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
134 89800 mb_type[mb_y * s->mb_stride + mb_x] =
135
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 89800 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
136 }
137 }
138 354 break;
139 33 case SKIP_TYPE_COL:
140
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 693 for (mb_x = 0; mb_x < s->mb_width; mb_x++) {
141
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 660 if (get_bits_left(&s->gb) < 1)
142 ✗ return AVERROR_INVALIDDATA;
143
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 660 if (get_bits1(&s->gb)) {
144
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 2736 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
145 2565 mb_type[mb_y * s->mb_stride + mb_x] =
146 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_L0;
147 } else {
148
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 7824 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
149 7335 mb_type[mb_y * s->mb_stride + mb_x] =
150
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 7335 (get_bits1(&s->gb) ? MB_TYPE_SKIP : 0) | MB_TYPE_16x16 | MB_TYPE_L0;
151 }
152 }
153 33 break;
154 }
155
156
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 10185 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
157
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 202905 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
158 193365 coded_mb_count += !IS_SKIP(mb_type[mb_y * s->mb_stride + mb_x]);
159
160
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 645 if (coded_mb_count > get_bits_left(&s->gb))
161 ✗ return AVERROR_INVALIDDATA;
162
163 645 return 0;
164 }
165
166 12 static int decode_ext_header(WMV2DecContext *w)
167 {
168 12 MpegEncContext *const s = &w->s;
169 GetBitContext gb;
170 int fps;
171 int code;
172
173
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 12 if (s->avctx->extradata_size < 4)
174 ✗ return AVERROR_INVALIDDATA;
175
176 12 init_get_bits(&gb, s->avctx->extradata, 32);
177
178 12 fps = get_bits(&gb, 5);
179 12 s->bit_rate = get_bits(&gb, 11) * 1024;
180 12 w->mspel_bit = get_bits1(&gb);
181 12 s->loop_filter = get_bits1(&gb);
182 12 w->abt_flag = get_bits1(&gb);
183 12 w->j_type_bit = get_bits1(&gb);
184 12 w->top_left_mv_flag = get_bits1(&gb);
185 12 w->per_mb_rl_bit = get_bits1(&gb);
186 12 code = get_bits(&gb, 3);
187
188
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 12 if (code == 0)
189 ✗ return AVERROR_INVALIDDATA;
190
191 12 s->slice_height = s->mb_height / code;
192
193
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 12 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
194 ✗ av_log(s->avctx, AV_LOG_DEBUG,
195 "fps:%d, br:%"PRId64", qpbit:%d, abt_flag:%d, j_type_bit:%d, "
196 "tl_mv_flag:%d, mbrl_bit:%d, code:%d, loop_filter:%d, "
197 "slices:%d\n",
198 fps, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
199 w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
200 code);
201 12 return 0;
202 }
203
204 674 int ff_wmv2_decode_picture_header(MpegEncContext *s)
205 {
206 int code;
207
208 674 s->pict_type = get_bits1(&s->gb) + 1;
209
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 674 if (s->pict_type == AV_PICTURE_TYPE_I) {
210 29 code = get_bits(&s->gb, 7);
211 29 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
212 }
213 674 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
214
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 674 if (s->qscale <= 0)
215 ✗ return AVERROR_INVALIDDATA;
216
217
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 674 if (s->pict_type != AV_PICTURE_TYPE_I && show_bits(&s->gb, 1)) {
218 387 GetBitContext gb = s->gb;
219 387 int skip_type = get_bits(&gb, 2);
220
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 387 int run = skip_type == SKIP_TYPE_COL ? s->mb_width : s->mb_height;
221
222
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 387 while (run > 0) {
223 387 int block = FFMIN(run, 25);
224
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 387 if (get_bits(&gb, block) + 1 != 1<<block)
225 387 break;
226 ✗ run -= block;
227 }
228
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 387 if (!run)
229 ✗ return FRAME_SKIPPED;
230 }
231
232 674 return 0;
233 }
234
235 674 int ff_wmv2_decode_secondary_picture_header(MpegEncContext *s)
236 {
237 674 WMV2DecContext *const w = (WMV2DecContext *) s;
238
239
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 674 if (s->pict_type == AV_PICTURE_TYPE_I) {
240 /* Is filling with zeroes really the right thing to do? */
241 29 memset(s->current_picture_ptr->mb_type, 0,
242 sizeof(*s->current_picture_ptr->mb_type) *
243 29 s->mb_height * s->mb_stride);
244
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 29 if (w->j_type_bit)
245 29 w->j_type = get_bits1(&s->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 s->per_mb_rl_table = get_bits1(&s->gb);
252 else
253 ✗ s->per_mb_rl_table = 0;
254
255
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 26 if (!s->per_mb_rl_table) {
256 26 s->rl_chroma_table_index = decode012(&s->gb);
257 26 s->rl_table_index = decode012(&s->gb);
258 }
259
260 26 s->dc_table_index = get_bits1(&s->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(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
268 ✗ return AVERROR_INVALIDDATA;
269 }
270 29 s->inter_intra_pred = 0;
271 29 s->no_rounding = 1;
272
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 29 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
273 ✗ av_log(s->avctx, AV_LOG_DEBUG,
274 "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d j_type:%d \n",
275 s->qscale, s->rl_chroma_table_index, s->rl_table_index,
276 s->dc_table_index, s->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(&s->gb);
287 645 w->cbp_table_index = wmv2_get_cbp_table_index(s, cbp_index);
288
289
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 645 if (w->mspel_bit)
290 645 s->mspel = get_bits1(&s->gb);
291 else
292 ✗ s->mspel = 0; // FIXME check
293
294
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 645 if (w->abt_flag) {
295 645 w->per_mb_abt = get_bits1(&s->gb) ^ 1;
296
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 645 if (!w->per_mb_abt)
297 187 w->abt_type = decode012(&s->gb);
298 }
299
300
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 645 if (w->per_mb_rl_bit)
301 645 s->per_mb_rl_table = get_bits1(&s->gb);
302 else
303 ✗ s->per_mb_rl_table = 0;
304
305
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 645 if (!s->per_mb_rl_table) {
306 617 s->rl_table_index = decode012(&s->gb);
307 617 s->rl_chroma_table_index = s->rl_table_index;
308 }
309
310
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 645 if (get_bits_left(&s->gb) < 2)
311 ✗ return AVERROR_INVALIDDATA;
312
313 645 s->dc_table_index = get_bits1(&s->gb);
314 645 s->mv_table_index = get_bits1(&s->gb);
315
316 645 s->inter_intra_pred = 0; // (s->width * s->height < 320 * 240 && s->bit_rate <= II_BITRATE);
317 645 s->no_rounding ^= 1;
318
319
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 645 if (s->avctx->debug & FF_DEBUG_PICT_INFO) {
320 ✗ av_log(s->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 s->rl_table_index, s->rl_chroma_table_index,
324 s->dc_table_index, s->mv_table_index,
325 s->per_mb_rl_table, s->qscale, s->mspel,
326 w->per_mb_abt, w->abt_type, w->cbp_table_index,
327 s->inter_intra_pred);
328 }
329 }
330 674 s->esc3_level_length = 0;
331 674 s->esc3_run_length = 0;
332
333
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 674 if (w->j_type) {
334 3 ff_intrax8_decode_picture(&w->x8, &s->current_picture,
335 &s->gb, &s->mb_x, &s->mb_y,
336 3 2 * s->qscale, (s->qscale - 1) | 1,
337 s->loop_filter, s->low_delay);
338
339 3 ff_er_add_slice(&w->s.er, 0, 0,
340 3 (w->s.mb_x >> 1) - 1, (w->s.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 MpegEncContext *const s = &w->s;
351
352 118424 ff_msmpeg4_decode_motion(s, mx_ptr, my_ptr);
353
354
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 118424 if ((((*mx_ptr) | (*my_ptr)) & 1) && s->mspel)
355 19528 w->common.hshift = get_bits1(&s->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 MpegEncContext *const s = &w->s;
363 int xy, wrap, diff, type;
364 int16_t *A, *B, *C, *mot_val;
365
366 118424 wrap = s->b8_stride;
367 118424 xy = s->block_index[0];
368
369 118424 mot_val = s->current_picture.motion_val[0][xy];
370
371 118424 A = s->current_picture.motion_val[0][xy - 1];
372 118424 B = s->current_picture.motion_val[0][xy - wrap];
373 118424 C = s->current_picture.motion_val[0][xy + 2 - wrap];
374
375
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 118424 if (s->mb_x && !s->first_slice_line && !s->mspel && w->top_left_mv_flag)
376 22431 diff = FFMAX(FFABS(A[0] - B[0]), FFABS(A[1] - B[1]));
377 else
378 95993 diff = 0;
379
380
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 118424 if (diff >= 8)
381 3203 type = get_bits1(&s->gb);
382 else
383 115221 type = 2;
384
385
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 118424 if (type == 0) {
386 1698 *px = A[0];
387 1698 *py = A[1];
388
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 116726 } else if (type == 1) {
389 1505 *px = B[0];
390 1505 *py = B[1];
391 } else {
392 /* special case for first (slice) line */
393
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 115221 if (s->first_slice_line) {
394 4281 *px = A[0];
395 4281 *py = A[1];
396 } else {
397 110940 *px = mid_pred(A[0], B[0], C[0]);
398 110940 *py = mid_pred(A[1], B[1], C[1]);
399 }
400 }
401
402 118424 return mot_val;
403 }
404
405 710544 static inline int wmv2_decode_inter_block(WMV2DecContext *w, int16_t *block,
406 int n, int cbp)
407 {
408 710544 MpegEncContext *const s = &w->s;
409 static const int sub_cbp_table[3] = { 2, 3, 1 };
410 int sub_cbp, ret;
411
412
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 710544 if (!cbp) {
413 529955 s->block_last_index[n] = -1;
414 529955 return 0;
415 }
416
417
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 180589 if (w->per_block_abt)
418 20828 w->abt_type = decode012(&s->gb);
419 180589 w->abt_type_table[n] = w->abt_type;
420
421
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 180589 if (w->abt_type) {
422
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 31447 const uint8_t *scantable = w->abt_type == 1 ? ff_wmv2_scantableA : ff_wmv2_scantableB;
423
424 31447 sub_cbp = sub_cbp_table[decode012(&s->gb)];
425
426
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 31447 if (sub_cbp & 1)
427
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 18950 if ((ret = ff_msmpeg4_decode_block(s, block, n, 1, scantable)) < 0)
428 ✗ return ret;
429
430
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 31447 if (sub_cbp & 2)
431
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 19090 if ((ret = ff_msmpeg4_decode_block(s, w->abt_block2[n], n, 1, scantable)) < 0)
432 ✗ return ret;
433
434 31447 s->block_last_index[n] = 63;
435
436 31447 return 0;
437 } else {
438 149142 return ff_msmpeg4_decode_block(s, block, n, 1,
439 149142 s->inter_scantable.permutated);
440 }
441 }
442
443 201150 static int wmv2_decode_mb(MpegEncContext *s, int16_t block[6][64])
444 {
445 /* The following is only allowed because this encoder
446 * does not use slice threading. */
447 201150 WMV2DecContext *const w = (WMV2DecContext *) s;
448 int cbp, code, i, ret;
449 uint8_t *coded_val;
450
451
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 201150 if (w->j_type)
452 ✗ return 0;
453
454
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 201150 if (s->pict_type == AV_PICTURE_TYPE_P) {
455
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 193365 if (IS_SKIP(s->current_picture.mb_type[s->mb_y * s->mb_stride + s->mb_x])) {
456 /* skip mb */
457 71725 s->mb_intra = 0;
458
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 502075 for (i = 0; i < 6; i++)
459 430350 s->block_last_index[i] = -1;
460 71725 s->mv_dir = MV_DIR_FORWARD;
461 71725 s->mv_type = MV_TYPE_16X16;
462 71725 s->mv[0][0][0] = 0;
463 71725 s->mv[0][0][1] = 0;
464 71725 s->mb_skipped = 1;
465 71725 w->common.hshift = 0;
466 71725 return 0;
467 }
468
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 121640 if (get_bits_left(&s->gb) <= 0)
469 ✗ return AVERROR_INVALIDDATA;
470
471 121640 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[w->cbp_table_index],
472 MB_NON_INTRA_VLC_BITS, 3);
473 121640 s->mb_intra = (~code & 0x40) >> 6;
474
475 121640 cbp = code & 0x3f;
476 } else {
477 7785 s->mb_intra = 1;
478
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 7785 if (get_bits_left(&s->gb) <= 0)
479 ✗ return AVERROR_INVALIDDATA;
480 7785 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc,
481 MSMP4_MB_INTRA_VLC_BITS, 2);
482 /* predict coded block pattern */
483 7785 cbp = 0;
484
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 54495 for (i = 0; i < 6; i++) {
485 46710 int val = ((code >> (5 - i)) & 1);
486
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 46710 if (i < 4) {
487 31140 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
488 31140 val = val ^ pred;
489 31140 *coded_val = val;
490 }
491 46710 cbp |= val << (5 - i);
492 }
493 }
494
495
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 129425 if (!s->mb_intra) {
496 int mx, my;
497 118424 wmv2_pred_motion(w, &mx, &my);
498
499
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 118424 if (cbp) {
500 76773 s->bdsp.clear_blocks(s->block[0]);
501
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 76773 if (s->per_mb_rl_table) {
502 1656 s->rl_table_index = decode012(&s->gb);
503 1656 s->rl_chroma_table_index = s->rl_table_index;
504 }
505
506
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 76773 if (w->abt_flag && w->per_mb_abt) {
507 37493 w->per_block_abt = get_bits1(&s->gb);
508
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 37493 if (!w->per_block_abt)
509 30618 w->abt_type = decode012(&s->gb);
510 } else
511 39280 w->per_block_abt = 0;
512 }
513
514 118424 wmv2_decode_motion(w, &mx, &my);
515
516 118424 s->mv_dir = MV_DIR_FORWARD;
517 118424 s->mv_type = MV_TYPE_16X16;
518 118424 s->mv[0][0][0] = mx;
519 118424 s->mv[0][0][1] = my;
520
521
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 828968 for (i = 0; i < 6; i++) {
522
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 710544 if ((ret = wmv2_decode_inter_block(w, block[i], i, (cbp >> (5 - i)) & 1)) < 0) {
523 ✗ av_log(s->avctx, AV_LOG_ERROR,
524 "\nerror while decoding inter block: %d x %d (%d)\n",
525 s->mb_x, s->mb_y, i);
526 ✗ return ret;
527 }
528 }
529 } else {
530 11001 if (s->pict_type == AV_PICTURE_TYPE_P)
531 ff_dlog(s->avctx, "%d%d ", s->inter_intra_pred, cbp);
532 ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
533 ((cbp & 3) ? 1 : 0) + ((cbp & 0x3C) ? 2 : 0),
534 show_bits(&s->gb, 24));
535 11001 s->ac_pred = get_bits1(&s->gb);
536
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 11001 if (s->inter_intra_pred) {
537 ✗ s->h263_aic_dir = get_vlc2(&s->gb, ff_inter_intra_vlc,
538 INTER_INTRA_VLC_BITS, 1);
539 ff_dlog(s->avctx, "%d%d %d %d/",
540 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
541 }
542
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 11001 if (s->per_mb_rl_table && cbp) {
543 128 s->rl_table_index = decode012(&s->gb);
544 128 s->rl_chroma_table_index = s->rl_table_index;
545 }
546
547 11001 s->bdsp.clear_blocks(s->block[0]);
548
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 77007 for (i = 0; i < 6; i++) {
549
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 66006 if ((ret = ff_msmpeg4_decode_block(s, block[i], i, (cbp >> (5 - i)) & 1, NULL)) < 0) {
550 ✗ av_log(s->avctx, AV_LOG_ERROR,
551 "\nerror while decoding intra block: %d x %d (%d)\n",
552 s->mb_x, s->mb_y, i);
553 ✗ return ret;
554 }
555 }
556 }
557
558 129425 return 0;
559 }
560
561 12 static av_cold int wmv2_decode_init(AVCodecContext *avctx)
562 {
563 12 WMV2DecContext *const w = avctx->priv_data;
564 12 MpegEncContext *const s = &w->s;
565 int ret;
566
567 12 s->private_ctx = &w->common;
568
569
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 12 if ((ret = ff_msmpeg4_decode_init(avctx)) < 0)
570 ✗ return ret;
571
572 12 s->decode_mb = wmv2_decode_mb;
573
574 12 ff_wmv2_common_init(s);
575
576 12 decode_ext_header(w);
577
578 12 return ff_intrax8_common_init(avctx, &w->x8,
579 12 w->s.block, w->s.block_last_index,
580 w->s.mb_width, w->s.mb_height);
581 }
582
583 12 static av_cold int wmv2_decode_end(AVCodecContext *avctx)
584 {
585 12 WMV2DecContext *const w = avctx->priv_data;
586
587 12 ff_intrax8_common_end(&w->x8);
588 12 return ff_h263_decode_end(avctx);
589 }
590
591 const FFCodec ff_wmv2_decoder = {
592 .p.name = "wmv2",
593 CODEC_LONG_NAME("Windows Media Video 8"),
594 .p.type = AVMEDIA_TYPE_VIDEO,
595 .p.id = AV_CODEC_ID_WMV2,
596 .priv_data_size = sizeof(WMV2DecContext),
597 .init = wmv2_decode_init,
598 .close = wmv2_decode_end,
599 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
600 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
601 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
602 };
603