FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/msmpeg4dec.c
Date: 2025-07-01 21:35:40
Exec Total Coverage
Lines: 409 475 86.1%
Functions: 11 11 100.0%
Branches: 205 268 76.5%
Line Branch Exec Source
1 /*
2 * MSMPEG4 backend for encoder and decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2013 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * msmpeg4v1 & v2 stuff by Michael Niedermayer <michaelni@gmx.at>
7 *
8 * This file is part of FFmpeg.
9 *
10 * FFmpeg is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU Lesser General Public
12 * License as published by the Free Software Foundation; either
13 * version 2.1 of the License, or (at your option) any later version.
14 *
15 * FFmpeg is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * Lesser General Public License for more details.
19 *
20 * You should have received a copy of the GNU Lesser General Public
21 * License along with FFmpeg; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
23 */
24
25 #include "libavutil/thread.h"
26
27 #include "avcodec.h"
28 #include "codec_internal.h"
29 #include "mpegutils.h"
30 #include "mpegvideo.h"
31 #include "mpegvideodec.h"
32 #include "msmpeg4.h"
33 #include "msmpeg4dec.h"
34 #include "libavutil/imgutils.h"
35 #include "h263.h"
36 #include "h263data.h"
37 #include "h263dec.h"
38 #include "mpeg4videodec.h"
39 #include "msmpeg4data.h"
40 #include "msmpeg4_vc1_data.h"
41
42 #define V2_INTRA_CBPC_VLC_BITS 3
43 #define V2_MB_TYPE_VLC_BITS 7
44 #define MV_VLC_BITS 9
45 #define TEX_VLC_BITS 9
46
47 #define DEFAULT_INTER_INDEX 3
48
49 static const VLCElem *mv_tables[2];
50
51 5490 static inline int msmpeg4v1_pred_dc(MpegEncContext * s, int n,
52 int32_t **dc_val_ptr)
53 {
54 int i;
55
56
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 5490 if (n < 4) {
57 3660 i= 0;
58 } else {
59 1830 i= n-3;
60 }
61
62 5490 *dc_val_ptr= &s->last_dc[i];
63 5490 return s->last_dc[i];
64 }
65
66 /****************************************/
67 /* decoding stuff */
68
69 const VLCElem *ff_mb_non_intra_vlc[4];
70 static VLCElem v2_dc_lum_vlc[1472];
71 static VLCElem v2_dc_chroma_vlc[1506];
72 static VLCElem v2_intra_cbpc_vlc[8];
73 static VLCElem v2_mb_type_vlc[128];
74 VLCElem ff_inter_intra_vlc[8];
75
76 /* This is identical to H.263 except that its range is multiplied by 2. */
77 132268 static int msmpeg4v2_decode_motion(MpegEncContext * s, int pred, int f_code)
78 {
79 int code, val, sign, shift;
80
81 132268 code = get_vlc2(&s->gb, ff_h263_mv_vlc, H263_MV_VLC_BITS, 2);
82 ff_dlog(s->avctx, "MV code %d at %d %d pred: %d\n", code, s->mb_x,s->mb_y, pred);
83
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 132268 if (code < 0)
84 ✗ return 0xffff;
85
86
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 132268 if (code == 0)
87 68571 return pred;
88 63697 sign = get_bits1(&s->gb);
89 63697 shift = f_code - 1;
90 63697 val = code;
91
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 63697 if (shift) {
92 ✗ val = (val - 1) << shift;
93 ✗ val |= get_bits(&s->gb, shift);
94 ✗ val++;
95 }
96
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 63697 if (sign)
97 26289 val = -val;
98
99 63697 val += pred;
100
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 63697 if (val <= -64)
101 138 val += 64;
102
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 63559 else if (val >= 64)
103 13 val -= 64;
104
105 63697 return val;
106 }
107
108 76350 static int msmpeg4v12_decode_mb(MpegEncContext *s, int16_t block[6][64])
109 {
110 76350 MSMP4DecContext *const ms = mpv_to_msmpeg4(s);
111 int cbp, code, i;
112 76350 uint32_t * const mb_type_ptr = &s->cur_pic.mb_type[s->mb_x + s->mb_y*s->mb_stride];
113
114
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 76350 if (s->pict_type == AV_PICTURE_TYPE_P) {
115
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 70035 if (ms->use_skip_mb_code) {
116
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 70035 if (get_bits1(&s->gb)) {
117 /* skip mb */
118 1159 s->mb_intra = 0;
119
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 8113 for(i=0;i<6;i++)
120 6954 s->block_last_index[i] = -1;
121 1159 s->mv_dir = MV_DIR_FORWARD;
122 1159 s->mv_type = MV_TYPE_16X16;
123 1159 s->mv[0][0][0] = 0;
124 1159 s->mv[0][0][1] = 0;
125 1159 s->mb_skipped = 1;
126 1159 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
127 1159 return 0;
128 }
129 }
130
131
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 68876 if (s->msmpeg4_version == MSMP4_V2)
132 53160 code = get_vlc2(&s->gb, v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 1);
133 else
134 15716 code = get_vlc2(&s->gb, ff_h263_inter_MCBPC_vlc, INTER_MCBPC_VLC_BITS, 2);
135
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 68876 if(code<0 || code>7){
136 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", code, s->mb_x, s->mb_y);
137 ✗ return -1;
138 }
139
140 68876 s->mb_intra = code >>2;
141
142 68876 cbp = code & 0x3;
143 } else {
144 6315 s->mb_intra = 1;
145
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 6315 if (s->msmpeg4_version == MSMP4_V2)
146 5985 cbp = get_vlc2(&s->gb, v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 1);
147 else
148 330 cbp = get_vlc2(&s->gb, ff_h263_intra_MCBPC_vlc, INTRA_MCBPC_VLC_BITS, 2);
149
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 6315 if(cbp<0 || cbp>3){
150 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpc %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
151 ✗ return -1;
152 }
153 }
154
155
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 75191 if (!s->mb_intra) {
156 int mx, my, cbpy;
157
158 66134 cbpy = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
159
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 66134 if(cbpy<0){
160 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpy %d invalid at %d %d\n", cbp, s->mb_x, s->mb_y);
161 ✗ return -1;
162 }
163
164 66134 cbp|= cbpy<<2;
165
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 66134 if (s->msmpeg4_version == MSMP4_V1 || (cbp&3) != 3)
166 55724 cbp ^= 0x3C;
167
168 66134 ff_h263_pred_motion(s, 0, 0, &mx, &my);
169 66134 mx= msmpeg4v2_decode_motion(s, mx, 1);
170 66134 my= msmpeg4v2_decode_motion(s, my, 1);
171
172 66134 s->mv_dir = MV_DIR_FORWARD;
173 66134 s->mv_type = MV_TYPE_16X16;
174 66134 s->mv[0][0][0] = mx;
175 66134 s->mv[0][0][1] = my;
176 66134 *mb_type_ptr = MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
177 } else {
178 int v;
179
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 9057 if (s->msmpeg4_version == MSMP4_V2) {
180 8142 s->ac_pred = get_bits1(&s->gb);
181 8142 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
182
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 8142 if (v < 0) {
183 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
184 ✗ return -1;
185 }
186 8142 cbp|= v<<2;
187 } else{
188 915 s->ac_pred = 0;
189 915 v = get_vlc2(&s->gb, ff_h263_cbpy_vlc, CBPY_VLC_BITS, 1);
190
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 915 if (v < 0) {
191 ✗ av_log(s->avctx, AV_LOG_ERROR, "cbpy vlc invalid\n");
192 ✗ return -1;
193 }
194 915 cbp|= v<<2;
195
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 915 if(s->pict_type==AV_PICTURE_TYPE_P) cbp^=0x3C;
196 }
197 9057 *mb_type_ptr = MB_TYPE_INTRA;
198 }
199
200 75191 s->bdsp.clear_blocks(s->block[0]);
201
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 526337 for (i = 0; i < 6; i++) {
202
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 451146 if (ff_msmpeg4_decode_block(ms, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
203 {
204 ✗ av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
205 ✗ return -1;
206 }
207 }
208 75191 return 0;
209 }
210
211 129600 static int msmpeg4v34_decode_mb(MpegEncContext *s, int16_t block[6][64])
212 {
213 129600 MSMP4DecContext *const ms = mpv_to_msmpeg4(s);
214 int cbp, code, i;
215 uint8_t *coded_val;
216 129600 uint32_t * const mb_type_ptr = &s->cur_pic.mb_type[s->mb_x + s->mb_y*s->mb_stride];
217
218
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 129600 if (get_bits_left(&s->gb) <= 0)
219 ✗ return AVERROR_INVALIDDATA;
220
221
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 129600 if (s->pict_type == AV_PICTURE_TYPE_P) {
222
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 116442 if (ms->use_skip_mb_code) {
223
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 116442 if (get_bits1(&s->gb)) {
224 /* skip mb */
225 1554 s->mb_intra = 0;
226
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 10878 for(i=0;i<6;i++)
227 9324 s->block_last_index[i] = -1;
228 1554 s->mv_dir = MV_DIR_FORWARD;
229 1554 s->mv_type = MV_TYPE_16X16;
230 1554 s->mv[0][0][0] = 0;
231 1554 s->mv[0][0][1] = 0;
232 1554 s->mb_skipped = 1;
233 1554 *mb_type_ptr = MB_TYPE_SKIP | MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
234
235 1554 return 0;
236 }
237 }
238
239 114888 code = get_vlc2(&s->gb, ff_mb_non_intra_vlc[DEFAULT_INTER_INDEX], MB_NON_INTRA_VLC_BITS, 3);
240 //s->mb_intra = (code & 0x40) ? 0 : 1;
241 114888 s->mb_intra = (~code & 0x40) >> 6;
242
243 114888 cbp = code & 0x3f;
244 } else {
245 13158 s->mb_intra = 1;
246 13158 code = get_vlc2(&s->gb, ff_msmp4_mb_i_vlc, MSMP4_MB_INTRA_VLC_BITS, 2);
247 /* predict coded block pattern */
248 13158 cbp = 0;
249
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 92106 for(i=0;i<6;i++) {
250 78948 int val = ((code >> (5 - i)) & 1);
251
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 78948 if (i < 4) {
252 52632 int pred = ff_msmpeg4_coded_block_pred(s, i, &coded_val);
253 52632 val = val ^ pred;
254 52632 *coded_val = val;
255 }
256 78948 cbp |= val << (5 - i);
257 }
258 }
259
260
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 128046 if (!s->mb_intra) {
261 int mx, my;
262
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 109652 if (ms->per_mb_rl_table && cbp) {
263 ✗ ms->rl_table_index = decode012(&s->gb);
264 ✗ ms->rl_chroma_table_index = ms->rl_table_index;
265 }
266 109652 ff_h263_pred_motion(s, 0, 0, &mx, &my);
267 109652 ff_msmpeg4_decode_motion(ms, &mx, &my);
268 109652 s->mv_dir = MV_DIR_FORWARD;
269 109652 s->mv_type = MV_TYPE_16X16;
270 109652 s->mv[0][0][0] = mx;
271 109652 s->mv[0][0][1] = my;
272 109652 *mb_type_ptr = MB_TYPE_FORWARD_MV | MB_TYPE_16x16;
273 } else {
274 ff_dlog(s->avctx, "I at %d %d %d %06X\n", s->mb_x, s->mb_y,
275 ((cbp & 3) ? 1 : 0) +((cbp & 0x3C)? 2 : 0),
276 show_bits(&s->gb, 24));
277 18394 s->ac_pred = get_bits1(&s->gb);
278 18394 *mb_type_ptr = MB_TYPE_INTRA;
279
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 18394 if(s->inter_intra_pred){
280 ✗ s->h263_aic_dir= get_vlc2(&s->gb, ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 1);
281 ff_dlog(s->avctx, "%d%d %d %d/",
282 s->ac_pred, s->h263_aic_dir, s->mb_x, s->mb_y);
283 }
284
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 18394 if (ms->per_mb_rl_table && cbp) {
285 ✗ ms->rl_table_index = decode012(&s->gb);
286 ✗ ms->rl_chroma_table_index = ms->rl_table_index;
287 }
288 }
289
290 128046 s->bdsp.clear_blocks(s->block[0]);
291
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 896322 for (i = 0; i < 6; i++) {
292
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 768276 if (ff_msmpeg4_decode_block(ms, block[i], i, (cbp >> (5 - i)) & 1, NULL) < 0)
293 {
294 ✗ av_log(s->avctx, AV_LOG_ERROR, "\nerror while decoding block: %d x %d (%d)\n", s->mb_x, s->mb_y, i);
295 ✗ return -1;
296 }
297 }
298
299 128046 return 0;
300 }
301
302 /* init all vlc decoding tables */
303 26 static av_cold void msmpeg4_decode_init_static(void)
304 {
305 static VLCElem vlc_buf[3714 + 2694 + 1636 + 2648 + 1532 + 2488];
306 26 VLCInitState state = VLC_INIT_STATE(vlc_buf);
307
308 26 INIT_FIRST_VLC_RL(ff_rl_table[0], 642);
309 26 INIT_FIRST_VLC_RL(ff_rl_table[1], 1104);
310 26 INIT_FIRST_VLC_RL(ff_rl_table[2], 554);
311
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 858 VLC_INIT_RL(ff_rl_table[3], 940);
312
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 858 VLC_INIT_RL(ff_rl_table[4], 962);
313 /* ff_rl_table[5] coincides with ff_h263_rl_inter which has just been
314 * initialized in ff_h263_decode_init() earlier. So just copy the VLCs. */
315 av_assert1(ff_h263_rl_inter.rl_vlc[0]);
316 26 memcpy(ff_rl_table[5].rl_vlc, ff_h263_rl_inter.rl_vlc, sizeof(ff_rl_table[5].rl_vlc));
317
318 26 VLC_INIT_STATIC_TABLE(v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 512,
319 &ff_v2_dc_lum_table[0][1], 8, 4,
320 &ff_v2_dc_lum_table[0][0], 8, 4, 0);
321 26 VLC_INIT_STATIC_TABLE(v2_dc_chroma_vlc, MSMP4_DC_VLC_BITS, 512,
322 &ff_v2_dc_chroma_table[0][1], 8, 4,
323 &ff_v2_dc_chroma_table[0][0], 8, 4, 0);
324
325 26 VLC_INIT_STATIC_TABLE(v2_intra_cbpc_vlc, V2_INTRA_CBPC_VLC_BITS, 4,
326 &ff_v2_intra_cbpc[0][1], 2, 1,
327 &ff_v2_intra_cbpc[0][0], 2, 1, 0);
328 26 VLC_INIT_STATIC_TABLE(v2_mb_type_vlc, V2_MB_TYPE_VLC_BITS, 8,
329 &ff_v2_mb_type[0][1], 2, 1,
330 &ff_v2_mb_type[0][0], 2, 1, 0);
331
332 26 mv_tables[0] = ff_vlc_init_tables_from_lengths(&state, MV_VLC_BITS,
333 MSMPEG4_MV_TABLES_NB_ELEMS,
334 ff_msmp4_mv_table0_lens, 1,
335 ff_msmp4_mv_table0, 2, 2,
336 0, 0);
337 26 mv_tables[1] = ff_vlc_init_tables_from_lengths(&state, MV_VLC_BITS,
338 MSMPEG4_MV_TABLES_NB_ELEMS,
339 ff_msmp4_mv_table1_lens, 1,
340 ff_msmp4_mv_table1, 2, 2,
341 0, 0);
342
343
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 130 for (unsigned i = 0; i < 4; i++) {
344 104 ff_mb_non_intra_vlc[i] =
345 104 ff_vlc_init_tables_sparse(&state, MB_NON_INTRA_VLC_BITS, 128,
346 104 &ff_wmv2_inter_table[i][0][1], 8, 4,
347 104 &ff_wmv2_inter_table[i][0][0], 8, 4,
348 NULL, 0, 0, 0);
349 }
350
351 26 VLC_INIT_STATIC_TABLE(ff_inter_intra_vlc, INTER_INTRA_VLC_BITS, 4,
352 &ff_table_inter_intra[0][1], 2, 1,
353 &ff_table_inter_intra[0][0], 2, 1, 0);
354 26 ff_msmp4_vc1_vlcs_init_once();
355 26 }
356
357 45 av_cold int ff_msmpeg4_decode_init(AVCodecContext *avctx)
358 {
359 static AVOnce init_static_once = AV_ONCE_INIT;
360 45 MpegEncContext *s = avctx->priv_data;
361 int ret;
362
363
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 45 if ((ret = av_image_check_size(avctx->width, avctx->height, 0, avctx)) < 0)
364 ✗ return ret;
365
366
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 45 if (ff_h263_decode_init(avctx) < 0)
367 ✗ return -1;
368
369 // We unquantize inter blocks as we parse them.
370 45 s->dct_unquantize_inter = NULL;
371
372 45 ff_msmpeg4_common_init(s);
373
374
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 45 switch (s->msmpeg4_version) {
375 11 case MSMP4_V1:
376 case MSMP4_V2:
377 11 s->decode_mb= msmpeg4v12_decode_mb;
378 11 break;
379 22 case MSMP4_V3:
380 case MSMP4_WMV1:
381 22 s->decode_mb= msmpeg4v34_decode_mb;
382 22 break;
383 12 case MSMP4_WMV2:
384 12 break;
385 ✗ default:
386 ✗ av_unreachable("List contains all cases using ff_msmpeg4_decode_init()");
387 }
388
389 45 s->slice_height= s->mb_height; //to avoid 1/0 if the first frame is not a keyframe
390
391 45 ff_thread_once(&init_static_once, msmpeg4_decode_init_static);
392
393 45 return 0;
394 }
395
396 675 int ff_msmpeg4_decode_picture_header(MpegEncContext * s)
397 {
398 675 MSMP4DecContext *const ms = mpv_to_msmpeg4(s);
399 int code;
400
401 // at minimum one bit per macroblock is required at least in a valid frame,
402 // we discard frames much smaller than this. Frames smaller than 1/8 of the
403 // smallest "black/skip" frame generally contain not much recoverable content
404 // while at the same time they have the highest computational requirements
405 // per byte
406
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 675 if (get_bits_left(&s->gb) * 8LL < (s->width+15)/16 * ((s->height+15)/16))
407 ✗ return AVERROR_INVALIDDATA;
408
409
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 675 if (s->msmpeg4_version == MSMP4_V1) {
410 50 int start_code = get_bits_long(&s->gb, 32);
411
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 50 if(start_code!=0x00000100){
412 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid startcode\n");
413 ✗ return -1;
414 }
415
416 50 skip_bits(&s->gb, 5); // frame number */
417 }
418
419 675 s->pict_type = get_bits(&s->gb, 2) + 1;
420
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 675 if (s->pict_type != AV_PICTURE_TYPE_I &&
421
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 611 s->pict_type != AV_PICTURE_TYPE_P){
422 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid picture type\n");
423 ✗ return -1;
424 }
425 675 s->chroma_qscale= s->qscale = get_bits(&s->gb, 5);
426
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 675 if(s->qscale==0){
427 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid qscale\n");
428 ✗ return -1;
429 }
430
431
2/2
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 675 if (s->pict_type == AV_PICTURE_TYPE_I) {
432 64 code = get_bits(&s->gb, 5);
433
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 64 if (s->msmpeg4_version == MSMP4_V1) {
434
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✓ Branch 3 taken 1 times.
 1 if(code==0 || code>s->mb_height){
435 ✗ av_log(s->avctx, AV_LOG_ERROR, "invalid slice height %d\n", code);
436 ✗ return -1;
437 }
438
439 1 s->slice_height = code;
440 }else{
441 /* 0x17: one slice, 0x18: two slices, ... */
442
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✓ Branch 1 taken 63 times.
 63 if (code < 0x17){
443 ✗ av_log(s->avctx, AV_LOG_ERROR, "error, slice code was %X\n", code);
444 ✗ return -1;
445 }
446
447 63 s->slice_height = s->mb_height / (code - 0x16);
448 }
449
450
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 64 switch(s->msmpeg4_version){
451 21 case MSMP4_V1:
452 case MSMP4_V2:
453 21 ms->rl_chroma_table_index = 2;
454 21 ms->rl_table_index = 2;
455
456 21 ms->dc_table_index = 0; //not used
457 21 break;
458 23 case MSMP4_V3:
459 23 ms->rl_chroma_table_index = decode012(&s->gb);
460 23 ms->rl_table_index = decode012(&s->gb);
461
462 23 ms->dc_table_index = get_bits1(&s->gb);
463 23 break;
464 20 case MSMP4_WMV1:
465 20 ff_msmpeg4_decode_ext_header(s, (2+5+5+17+7)/8);
466
467
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 20 if (ms->bit_rate > MBAC_BITRATE)
468 20 ms->per_mb_rl_table = get_bits1(&s->gb);
469 else
470 ✗ ms->per_mb_rl_table = 0;
471
472
1/2
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 20 if (!ms->per_mb_rl_table) {
473 20 ms->rl_chroma_table_index = decode012(&s->gb);
474 20 ms->rl_table_index = decode012(&s->gb);
475 }
476
477 20 ms->dc_table_index = get_bits1(&s->gb);
478 20 s->inter_intra_pred= 0;
479 20 break;
480 ✗ default:
481 ✗ av_unreachable("ff_msmpeg4_decode_picture_header() only used by MSMP4V1-3, WMV1");
482 }
483 64 s->no_rounding = 1;
484
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 64 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
485 ✗ av_log(s->avctx, AV_LOG_DEBUG, "qscale:%d rlc:%d rl:%d dc:%d mbrl:%d slice:%d \n",
486 s->qscale,
487 ms->rl_chroma_table_index,
488 ms->rl_table_index,
489 ms->dc_table_index,
490 ms->per_mb_rl_table,
491 s->slice_height);
492 } else {
493
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 611 switch(s->msmpeg4_version){
494 229 case MSMP4_V1:
495 case MSMP4_V2:
496
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 229 if (s->msmpeg4_version == MSMP4_V1)
497 49 ms->use_skip_mb_code = 1;
498 else
499 180 ms->use_skip_mb_code = get_bits1(&s->gb);
500 229 ms->rl_table_index = 2;
501 229 ms->rl_chroma_table_index = ms->rl_table_index;
502 229 ms->dc_table_index = 0; //not used
503 229 ms->mv_table_index = 0;
504 229 break;
505 202 case MSMP4_V3:
506 202 ms->use_skip_mb_code = get_bits1(&s->gb);
507 202 ms->rl_table_index = decode012(&s->gb);
508 202 ms->rl_chroma_table_index = ms->rl_table_index;
509
510 202 ms->dc_table_index = get_bits1(&s->gb);
511
512 202 ms->mv_table_index = get_bits1(&s->gb);
513 202 break;
514 180 case MSMP4_WMV1:
515 180 ms->use_skip_mb_code = get_bits1(&s->gb);
516
517
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 180 if (ms->bit_rate > MBAC_BITRATE)
518 180 ms->per_mb_rl_table = get_bits1(&s->gb);
519 else
520 ✗ ms->per_mb_rl_table = 0;
521
522
1/2
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✗ Branch 1 not taken.
 180 if (!ms->per_mb_rl_table) {
523 180 ms->rl_table_index = decode012(&s->gb);
524 180 ms->rl_chroma_table_index = ms->rl_table_index;
525 }
526
527 180 ms->dc_table_index = get_bits1(&s->gb);
528
529 180 ms->mv_table_index = get_bits1(&s->gb);
530
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 225 s->inter_intra_pred = s->width*s->height < 320*240 &&
531
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 45 ms->bit_rate <= II_BITRATE;
532 180 break;
533 ✗ default:
534 ✗ av_unreachable("ff_msmpeg4_decode_picture_header() only used by MSMP4V1-3, WMV1");
535 }
536
537
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 611 if(s->avctx->debug&FF_DEBUG_PICT_INFO)
538 ✗ av_log(s->avctx, AV_LOG_DEBUG, "skip:%d rl:%d rlc:%d dc:%d mv:%d mbrl:%d qp:%d \n",
539 ms->use_skip_mb_code,
540 ms->rl_table_index,
541 ms->rl_chroma_table_index,
542 ms->dc_table_index,
543 ms->mv_table_index,
544 ms->per_mb_rl_table,
545 s->qscale);
546
547
2/2
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 611 if(s->flipflop_rounding){
548 382 s->no_rounding ^= 1;
549 }else{
550 229 s->no_rounding = 0;
551 }
552 }
553 ff_dlog(s->avctx, "%d %d %d %d %d\n", s->pict_type, ms->bit_rate,
554 s->inter_intra_pred, s->width, s->height);
555
556 675 ms->esc3_level_length = 0;
557 675 ms->esc3_run_length = 0;
558
559 675 return 0;
560 }
561
562 64 int ff_msmpeg4_decode_ext_header(MpegEncContext * s, int buf_size)
563 {
564 64 MSMP4DecContext *const ms = mpv_to_msmpeg4(s);
565 64 int left= buf_size*8 - get_bits_count(&s->gb);
566
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 64 int length = s->msmpeg4_version >= MSMP4_V3 ? 17 : 16;
567 /* the alt_bitstream reader could read over the end so we need to check it */
568
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 64 if(left>=length && left<length+8)
569 {
570 63 skip_bits(&s->gb, 5); /* fps */
571 63 ms->bit_rate = get_bits(&s->gb, 11) * 1024;
572
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 63 if (s->msmpeg4_version >= MSMP4_V3)
573 43 s->flipflop_rounding= get_bits1(&s->gb);
574 else
575 20 s->flipflop_rounding= 0;
576 }
577
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 1 else if(left<length+8)
578 {
579 1 s->flipflop_rounding= 0;
580
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✗ Branch 1 not taken.
 1 if (s->msmpeg4_version != MSMP4_V2)
581 1 av_log(s->avctx, AV_LOG_ERROR, "ext header missing, %d left\n", left);
582 }
583 else
584 {
585 ✗ av_log(s->avctx, AV_LOG_ERROR, "I-frame too long, ignoring ext header\n");
586 }
587
588 64 return 0;
589 }
590
591 230712 static int msmpeg4_decode_dc(MSMP4DecContext *const ms, int n, int *dir_ptr)
592 {
593 230712 MpegEncContext *const s = &ms->m;
594 int level, pred;
595
596
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 230712 if (s->msmpeg4_version <= MSMP4_V2) {
597
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 54342 if (n < 4) {
598 36228 level = get_vlc2(&s->gb, v2_dc_lum_vlc, MSMP4_DC_VLC_BITS, 3);
599 } else {
600 18114 level = get_vlc2(&s->gb, v2_dc_chroma_vlc, MSMP4_DC_VLC_BITS, 3);
601 }
602
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 54342 if (level < 0) {
603 ✗ av_log(s->avctx, AV_LOG_ERROR, "illegal dc vlc\n");
604 ✗ *dir_ptr = 0;
605 ✗ return -1;
606 }
607 54342 level-=256;
608 } else {
609 176370 level = get_vlc2(&s->gb, ff_msmp4_dc_vlc[ms->dc_table_index][n >= 4],
610 MSMP4_DC_VLC_BITS, 3);
611
612
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 176370 if (level == DC_MAX) {
613 48 level = get_bits(&s->gb, 8);
614
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 48 if (get_bits1(&s->gb))
615 6 level = -level;
616
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 176322 } else if (level != 0) {
617
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 153813 if (get_bits1(&s->gb))
618 74512 level = -level;
619 }
620 }
621
622
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 230712 if (s->msmpeg4_version == MSMP4_V1) {
623 int32_t *dc_val;
624 5490 pred = msmpeg4v1_pred_dc(s, n, &dc_val);
625 5490 level += pred;
626
627 /* update predictor */
628 5490 *dc_val= level;
629 }else{
630 int16_t *dc_val;
631 225222 pred = ff_msmpeg4_pred_dc(s, n, &dc_val, dir_ptr);
632 225222 level += pred;
633
634 /* update predictor */
635
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 225222 if (n < 4) {
636 150148 *dc_val = level * s->y_dc_scale;
637 } else {
638 75074 *dc_val = level * s->c_dc_scale;
639 }
640 }
641
642 230712 return level;
643 }
644
645 1472610 int ff_msmpeg4_decode_block(MSMP4DecContext *const ms, int16_t * block,
646 int n, int coded, const uint8_t *scan_table)
647 {
648 1472610 MpegEncContext *const s = &ms->m;
649 int level, i, last, run, run_diff;
650 1472610 int dc_pred_dir = -1; //unused but its passed around, so it needs to be initialized
651 const RLTable *rl;
652 const RL_VLC_ELEM *rl_vlc;
653 int qmul, qadd;
654
655
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 1472610 if (s->mb_intra) {
656 230712 qmul=1;
657 230712 qadd=0;
658
659 /* DC coef */
660 230712 level = msmpeg4_decode_dc(ms, n, &dc_pred_dir);
661
662
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 230712 if (level < 0){
663 ✗ av_log(s->avctx, AV_LOG_ERROR, "dc overflow- block: %d qscale: %d//\n", n, s->qscale);
664 ✗ if(s->inter_intra_pred) level=0;
665 }
666
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 230712 if (n < 4) {
667 153808 rl = &ff_rl_table[ms->rl_table_index];
668
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 153808 if(level > 256*s->y_dc_scale){
669 ✗ av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ L qscale: %d//\n", s->qscale);
670 ✗ if(!s->inter_intra_pred) return -1;
671 }
672 } else {
673 76904 rl = &ff_rl_table[3 + ms->rl_chroma_table_index];
674
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 76904 if(level > 256*s->c_dc_scale){
675 ✗ av_log(s->avctx, AV_LOG_ERROR, "dc overflow+ C qscale: %d//\n", s->qscale);
676 ✗ if(!s->inter_intra_pred) return -1;
677 }
678 }
679 230712 block[0] = level;
680
681 230712 run_diff = s->msmpeg4_version >= MSMP4_WMV1;
682 230712 i = 0;
683
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 230712 if (!coded) {
684 42456 goto not_coded;
685 }
686
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 188256 if (s->ac_pred) {
687
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✓ Branch 1 taken 1296 times.
 3224 if (dc_pred_dir == 0)
688 1928 scan_table = s->permutated_intra_v_scantable; /* left */
689 else
690 1296 scan_table = s->permutated_intra_h_scantable; /* top */
691 } else {
692 185032 scan_table = s->intra_scantable.permutated;
693 }
694 188256 rl_vlc= rl->rl_vlc[0];
695 } else {
696 1241898 qmul = s->qscale << 1;
697 1241898 qadd = (s->qscale - 1) | 1;
698 1241898 i = -1;
699 1241898 rl = &ff_rl_table[3 + ms->rl_table_index];
700
701
2/2
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✓ Branch 1 taken 935880 times.
 1241898 if (s->msmpeg4_version == MSMP4_V2)
702 306018 run_diff = 0;
703 else
704 935880 run_diff = 1;
705
706
2/2
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✓ Branch 1 taken 608175 times.
 1241898 if (!coded) {
707 633723 s->block_last_index[n] = i;
708 633723 return 0;
709 }
710
2/2
✓ Branch 0 taken 420993 times.
✓ Branch 1 taken 187182 times.
 608175 if(!scan_table)
711 420993 scan_table = s->inter_scantable.permutated;
712 608175 rl_vlc= rl->rl_vlc[s->qscale];
713 }
714 {
715 796431 OPEN_READER(re, &s->gb);
716 for(;;) {
717 9175903 UPDATE_CACHE(re, &s->gb);
718
2/2
✓ Branch 1 taken 297834 times.
✓ Branch 2 taken 4688333 times.
 4986167 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 0);
719
2/2
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 4986167 if (level==0) {
720 int cache;
721 162066 cache= GET_CACHE(re, &s->gb);
722 /* escape */
723
4/4
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 162066 if (s->msmpeg4_version == MSMP4_V1 || (cache&0x80000000)==0) {
724
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✓ Branch 2 taken 19659 times.
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 96392 if (s->msmpeg4_version == MSMP4_V1 || (cache&0x40000000)==0) {
725 /* third escape */
726
2/2
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✓ Branch 1 taken 21891 times.
 41550 if (s->msmpeg4_version != MSMP4_V1)
727 19659 LAST_SKIP_BITS(re, &s->gb, 2);
728 41550 UPDATE_CACHE(re, &s->gb);
729
2/2
✓ Branch 0 taken 34734 times.
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 41550 if (s->msmpeg4_version <= MSMP4_V3) {
730 34734 last= SHOW_UBITS(re, &s->gb, 1); SKIP_CACHE(re, &s->gb, 1);
731 34734 run= SHOW_UBITS(re, &s->gb, 6); SKIP_CACHE(re, &s->gb, 6);
732 34734 level= SHOW_SBITS(re, &s->gb, 8);
733 34734 SKIP_COUNTER(re, &s->gb, 1+6+8);
734 }else{
735 int sign;
736 6816 last= SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
737
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 6816 if (!ms->esc3_level_length) {
738 int ll;
739 ff_dlog(s->avctx, "ESC-3 %X at %d %d\n",
740 show_bits(&s->gb, 24), s->mb_x, s->mb_y);
741
2/2
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 384 if(s->qscale<8){
742 78 ll= SHOW_UBITS(re, &s->gb, 3); SKIP_BITS(re, &s->gb, 3);
743
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✓ Branch 1 taken 78 times.
 78 if(ll==0){
744 ✗ ll= 8+SHOW_UBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1);
745 }
746 }else{
747 306 ll=2;
748
4/4
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✓ Branch 3 taken 1708 times.
✓ Branch 4 taken 26 times.
 2014 while(ll<8 && SHOW_UBITS(re, &s->gb, 1)==0){
749 1708 ll++;
750 1708 SKIP_BITS(re, &s->gb, 1);
751 }
752
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 306 if(ll<8) SKIP_BITS(re, &s->gb, 1);
753 }
754
755 384 ms->esc3_level_length = ll;
756 384 ms->esc3_run_length = SHOW_UBITS(re, &s->gb, 2) + 3; SKIP_BITS(re, &s->gb, 2);
757 384 UPDATE_CACHE(re, &s->gb);
758 }
759 6816 run = SHOW_UBITS(re, &s->gb, ms->esc3_run_length);
760 6816 SKIP_BITS(re, &s->gb, ms->esc3_run_length);
761
762 6816 sign= SHOW_UBITS(re, &s->gb, 1);
763 6816 SKIP_BITS(re, &s->gb, 1);
764
765 6816 level = SHOW_UBITS(re, &s->gb, ms->esc3_level_length);
766 6816 SKIP_BITS(re, &s->gb, ms->esc3_level_length);
767
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 6816 if(sign) level= -level;
768 }
769
770 //level = level * qmul + (level>0) * qadd - (level<=0) * qadd ;
771
2/2
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 41550 if (level>0) level= level * qmul + qadd;
772 20607 else level= level * qmul - qadd;
773 41550 i+= run + 1;
774
2/2
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✓ Branch 1 taken 22662 times.
 41550 if(last) i+=192;
775 } else {
776 /* second escape */
777 54842 SKIP_BITS(re, &s->gb, 2);
778
2/2
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✓ Branch 2 taken 47352 times.
 54842 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
779 54842 i+= run + rl->max_run[run>>7][level/qmul] + run_diff; //FIXME opt indexing
780 54842 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
781 54842 LAST_SKIP_BITS(re, &s->gb, 1);
782 }
783 } else {
784 /* first escape */
785 65674 SKIP_BITS(re, &s->gb, 1);
786
2/2
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✓ Branch 2 taken 56779 times.
 65674 GET_RL_VLC(level, run, re, &s->gb, rl_vlc, TEX_VLC_BITS, 2, 1);
787 65674 i+= run;
788 65674 level = level + rl->max_level[run>>7][(run-1)&63] * qmul;//FIXME opt indexing
789 65674 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
790 65674 LAST_SKIP_BITS(re, &s->gb, 1);
791 }
792 } else {
793 4824101 i+= run;
794 4824101 level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1);
795 4824101 LAST_SKIP_BITS(re, &s->gb, 1);
796 }
797
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 4986167 if (i > 62){
798 796431 i-= 192;
799
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 796431 if(i&(~63)){
800 ✗ const int left= get_bits_left(&s->gb);
801 ✗ if (((i + 192 == 64 && level / qmul == -1) ||
802 ✗ !(s->avctx->err_recognition & (AV_EF_BITSTREAM|AV_EF_COMPLIANT))) &&
803 left >= 0) {
804 ✗ av_log(s->avctx, AV_LOG_ERROR, "ignoring overflow at %d %d\n", s->mb_x, s->mb_y);
805 ✗ i = 63;
806 ✗ break;
807 }else{
808 ✗ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %d\n", s->mb_x, s->mb_y);
809 ✗ return -1;
810 }
811 }
812
813 796431 block[scan_table[i]] = level;
814 796431 break;
815 }
816
817 4189736 block[scan_table[i]] = level;
818 }
819 796431 CLOSE_READER(re, &s->gb);
820 }
821
2/2
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 796431 if (s->mb_intra) {
822 188256 not_coded:
823 230712 ff_mpeg4_pred_ac(s, block, n, dc_pred_dir);
824 }
825 838887 s->block_last_index[n] = i;
826
827 838887 return 0;
828 }
829
830 228076 void ff_msmpeg4_decode_motion(MSMP4DecContext *const ms, int *mx_ptr, int *my_ptr)
831 {
832 228076 const VLCElem *const mv_vlc = mv_tables[ms->mv_table_index];
833 228076 MpegEncContext *const s = &ms->m;
834 int sym, mx, my;
835
836 228076 sym = get_vlc2(&s->gb, mv_vlc, MV_VLC_BITS, 2);
837
2/2
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 228076 if (sym) {
838 226220 mx = sym >> 8;
839 226220 my = sym & 0xFF;
840 } else {
841 /* Escape */
842 1856 mx = get_bits(&s->gb, 6);
843 1856 my = get_bits(&s->gb, 6);
844 }
845
846 228076 mx += *mx_ptr - 32;
847 228076 my += *my_ptr - 32;
848 /* WARNING : they do not do exactly modulo encoding */
849
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 228076 if (mx <= -64)
850 22 mx += 64;
851
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 228054 else if (mx >= 64)
852 10 mx -= 64;
853
854
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 228076 if (my <= -64)
855 6 my += 64;
856
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 228070 else if (my >= 64)
857 4 my -= 64;
858 228076 *mx_ptr = mx;
859 228076 *my_ptr = my;
860 228076 }
861
862 const FFCodec ff_msmpeg4v1_decoder = {
863 .p.name = "msmpeg4v1",
864 CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 1"),
865 .p.type = AVMEDIA_TYPE_VIDEO,
866 .p.id = AV_CODEC_ID_MSMPEG4V1,
867 .priv_data_size = sizeof(MSMP4DecContext),
868 .init = ff_msmpeg4_decode_init,
869 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
870 .close = ff_mpv_decode_close,
871 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
872 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
873 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
874 .p.max_lowres = 3,
875 };
876
877 const FFCodec ff_msmpeg4v2_decoder = {
878 .p.name = "msmpeg4v2",
879 CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 2"),
880 .p.type = AVMEDIA_TYPE_VIDEO,
881 .p.id = AV_CODEC_ID_MSMPEG4V2,
882 .priv_data_size = sizeof(MSMP4DecContext),
883 .init = ff_msmpeg4_decode_init,
884 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
885 .close = ff_mpv_decode_close,
886 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
887 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
888 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
889 .p.max_lowres = 3,
890 };
891
892 const FFCodec ff_msmpeg4v3_decoder = {
893 .p.name = "msmpeg4",
894 CODEC_LONG_NAME("MPEG-4 part 2 Microsoft variant version 3"),
895 .p.type = AVMEDIA_TYPE_VIDEO,
896 .p.id = AV_CODEC_ID_MSMPEG4V3,
897 .priv_data_size = sizeof(MSMP4DecContext),
898 .init = ff_msmpeg4_decode_init,
899 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
900 .close = ff_mpv_decode_close,
901 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
902 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
903 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
904 .p.max_lowres = 3,
905 };
906
907 const FFCodec ff_wmv1_decoder = {
908 .p.name = "wmv1",
909 CODEC_LONG_NAME("Windows Media Video 7"),
910 .p.type = AVMEDIA_TYPE_VIDEO,
911 .p.id = AV_CODEC_ID_WMV1,
912 .priv_data_size = sizeof(MSMP4DecContext),
913 .init = ff_msmpeg4_decode_init,
914 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
915 .close = ff_mpv_decode_close,
916 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1,
917 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
918 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
919 .p.max_lowres = 3,
920 };
921