FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavcodec/wmv2dec.c
Date: 2024-07-17 14:05:47
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 "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 MpegEncContext s;
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 *block1,
60 uint8_t *dst, int stride, int n)
61 {
62 1140894 MpegEncContext *const s = &w->s;
63
64
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1140894 if (s->block_last_index[n] >= 0) {
65
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180589 switch (w->abt_type_table[n]) {
66 149142 case 0:
67 149142 w->common.wdsp.idct_add(dst, stride, block1);
68 149142 break;
69 16469 case 1:
70 16469 ff_simple_idct84_add(dst, stride, block1);
71 16469 ff_simple_idct84_add(dst + 4 * stride, stride, w->abt_block2[n]);
72 16469 s->bdsp.clear_block(w->abt_block2[n]);
73 16469 break;
74 14978 case 2:
75 14978 ff_simple_idct48_add(dst, stride, block1);
76 14978 ff_simple_idct48_add(dst + 4, stride, w->abt_block2[n]);
77 14978 s->bdsp.clear_block(w->abt_block2[n]);
78 14978 break;
79 default:
80 av_log(s->avctx, AV_LOG_ERROR, "internal error in WMV2 abt\n");
81 }
82 }
83 1140894 }
84
85 190149 void ff_wmv2_add_mb(MpegEncContext *s, int16_t block1[6][64],
86 uint8_t *dest_y, uint8_t *dest_cb, uint8_t *dest_cr)
87 {
88 190149 WMV2DecContext *const w = (WMV2DecContext *) s;
89
90 190149 wmv2_add_block(w, block1[0], dest_y, s->linesize, 0);
91 190149 wmv2_add_block(w, block1[1], dest_y + 8, s->linesize, 1);
92 190149 wmv2_add_block(w, block1[2], dest_y + 8 * s->linesize, s->linesize, 2);
93 190149 wmv2_add_block(w, block1[3], dest_y + 8 + 8 * s->linesize, s->linesize, 3);
94
95
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190149 if (s->avctx->flags & AV_CODEC_FLAG_GRAY)
96 return;
97
98 190149 wmv2_add_block(w, block1[4], dest_cb, s->uvlinesize, 4);
99 190149 wmv2_add_block(w, block1[5], dest_cr, s->uvlinesize, 5);
100 }
101
102 645 static int parse_mb_skip(WMV2DecContext *w)
103 {
104 int mb_x, mb_y;
105 645 int coded_mb_count = 0;
106 645 MpegEncContext *const s = &w->s;
107 645 uint32_t *const mb_type = s->cur_pic.mb_type;
108
109 645 w->skip_type = get_bits(&s->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 (mb_y = 0; mb_y < s->mb_height; mb_y++)
113
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72180 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
114 68865 mb_type[mb_y * s->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(&s->gb) < s->mb_height * s->mb_width)
119 return AVERROR_INVALIDDATA;
120
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448 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
121
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8820 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
122 8400 mb_type[mb_y * s->mb_stride + mb_x] =
123
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8400 (get_bits1(&s->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 (mb_y = 0; mb_y < s->mb_height; mb_y++) {
127
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5310 if (get_bits_left(&s->gb) < 1)
128 return AVERROR_INVALIDDATA;
129
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5310 if (get_bits1(&s->gb)) {
130
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17220 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
131 16400 mb_type[mb_y * s->mb_stride + mb_x] =
132 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
133 } else {
134
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94290 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
135 89800 mb_type[mb_y * s->mb_stride + mb_x] =
136
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89800 (get_bits1(&s->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 (mb_x = 0; mb_x < s->mb_width; mb_x++) {
142
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660 if (get_bits_left(&s->gb) < 1)
143 return AVERROR_INVALIDDATA;
144
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660 if (get_bits1(&s->gb)) {
145
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2736 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
146 2565 mb_type[mb_y * s->mb_stride + mb_x] =
147 MB_TYPE_SKIP | MB_TYPE_16x16 | MB_TYPE_FORWARD_MV;
148 } else {
149
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7824 for (mb_y = 0; mb_y < s->mb_height; mb_y++)
150 7335 mb_type[mb_y * s->mb_stride + mb_x] =
151
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7335 (get_bits1(&s->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 (mb_y = 0; mb_y < s->mb_height; mb_y++)
158
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202905 for (mb_x = 0; mb_x < s->mb_width; mb_x++)
159 193365 coded_mb_count += !IS_SKIP(mb_type[mb_y * s->mb_stride + mb_x]);
160
161
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645 if (coded_mb_count > get_bits_left(&s->gb))
162 return AVERROR_INVALIDDATA;
163
164 645 return 0;
165 }
166
167 12 static int decode_ext_header(WMV2DecContext *w)
168 {
169 12 MpegEncContext *const s = &w->s;
170 GetBitContext gb;
171 int fps;
172 int code;
173
174
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12 if (s->avctx->extradata_size < 4)
175 return AVERROR_INVALIDDATA;
176
177 12 init_get_bits(&gb, s->avctx->extradata, 32);
178
179 12 fps = get_bits(&gb, 5);
180 12 s->bit_rate = get_bits(&gb, 11) * 1024;
181 12 w->mspel_bit = get_bits1(&gb);
182 12 s->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 s->slice_height = s->mb_height / code;
193
194
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12 if (s->avctx->debug & FF_DEBUG_PICT_INFO)
195 av_log(s->avctx, AV_LOG_DEBUG,
196 "fps:%d, br:%"PRId64", 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, s->bit_rate, w->mspel_bit, w->abt_flag, w->j_type_bit,
200 w->top_left_mv_flag, w->per_mb_rl_bit, code, s->loop_filter,
201 code);
202 12 return 0;
203 }
204
205 674 int ff_wmv2_decode_picture_header(MpegEncContext *s)
206 {
207 int code;
208
209 674 s->pict_type = get_bits1(&s->gb) + 1;
210
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674 if (s->pict_type == AV_PICTURE_TYPE_I) {
211 29 code = get_bits(&s->gb, 7);
212 29 av_log(s->avctx, AV_LOG_DEBUG, "I7:%X/\n", code);
213 }
214 674 s->chroma_qscale = s->qscale = get_bits(&s->gb, 5);
215
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674 if (s->qscale <= 0)
216 return AVERROR_INVALIDDATA;
217
218
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674 if (s->pict_type != AV_PICTURE_TYPE_I && show_bits(&s->gb, 1)) {
219 387 GetBitContext gb = s->gb;
220 387 int skip_type = get_bits(&gb, 2);
221
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387 int run = skip_type == SKIP_TYPE_COL ? s->mb_width : s->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(MpegEncContext *s)
237 {
238 674 WMV2DecContext *const w = (WMV2DecContext *) s;
239
240
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674 if (s->pict_type == AV_PICTURE_TYPE_I) {
241 /* Is filling with zeroes really the right thing to do? */
242 29 memset(s->cur_pic.mb_type, 0,
243 29 sizeof(*s->cur_pic.mb_type) * 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->cur_pic.ptr,
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->cur_pic.motion_val[0][xy];
370
371 118424 A = s->cur_pic.motion_val[0][xy - 1];
372 118424 B = s->cur_pic.motion_val[0][xy - wrap];
373 118424 C = s->cur_pic.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->cur_pic.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_mpv_decode_close(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