FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h263dec.c
Date: 2026-01-23 19:11:46
Exec Total Coverage
Lines: 249 358 69.6%
Functions: 5 5 100.0%
Branches: 177 321 55.1%
Line Branch Exec Source
1 /*
2 * H.263 decoder
3 * Copyright (c) 2001 Fabrice Bellard
4 * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
5 *
6 * This file is part of FFmpeg.
7 *
8 * FFmpeg is free software; you can redistribute it and/or
9 * modify it under the terms of the GNU Lesser General Public
10 * License as published by the Free Software Foundation; either
11 * version 2.1 of the License, or (at your option) any later version.
12 *
13 * FFmpeg is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16 * Lesser General Public License for more details.
17 *
18 * You should have received a copy of the GNU Lesser General Public
19 * License along with FFmpeg; if not, write to the Free Software
20 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
21 */
22
23 /**
24 * @file
25 * H.263 decoder.
26 */
27
28 #define UNCHECKED_BITSTREAM_READER 1
29
30 #include "config_components.h"
31
32 #include "avcodec.h"
33 #include "codec_internal.h"
34 #include "decode.h"
35 #include "error_resilience.h"
36 #include "flvdec.h"
37 #include "h263.h"
38 #include "h263dec.h"
39 #include "hwaccel_internal.h"
40 #include "hwconfig.h"
41 #include "mpeg_er.h"
42 #include "mpeg4video.h"
43 #include "mpeg4videodec.h"
44 #include "mpegvideo.h"
45 #include "mpegvideodata.h"
46 #include "mpegvideodec.h"
47 #include "mpegvideo_unquantize.h"
48 #include "msmpeg4dec.h"
49 #include "thread.h"
50 #include "wmv2dec.h"
51
52 static const enum AVPixelFormat h263_hwaccel_pixfmt_list_420[] = {
53 #if CONFIG_H263_VAAPI_HWACCEL || CONFIG_MPEG4_VAAPI_HWACCEL
54 AV_PIX_FMT_VAAPI,
55 #endif
56 #if CONFIG_MPEG4_NVDEC_HWACCEL
57 AV_PIX_FMT_CUDA,
58 #endif
59 #if CONFIG_MPEG4_VDPAU_HWACCEL
60 AV_PIX_FMT_VDPAU,
61 #endif
62 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL || CONFIG_MPEG4_VIDEOTOOLBOX_HWACCEL
63 AV_PIX_FMT_VIDEOTOOLBOX,
64 #endif
65 AV_PIX_FMT_YUV420P,
66 AV_PIX_FMT_NONE
67 };
68
69 325 static enum AVPixelFormat h263_get_format(AVCodecContext *avctx)
70 {
71 /* MPEG-4 Studio Profile only, not supported by hardware */
72
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 325 if (avctx->bits_per_raw_sample > 8) {
73 av_assert1(((MpegEncContext *)avctx->priv_data)->studio_profile);
74 2 return avctx->pix_fmt;
75 }
76
77 if (CONFIG_GRAY && (avctx->flags & AV_CODEC_FLAG_GRAY)) {
78 if (avctx->color_range == AVCOL_RANGE_UNSPECIFIED)
79 avctx->color_range = AVCOL_RANGE_MPEG;
80 return AV_PIX_FMT_GRAY8;
81 }
82
83
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 323 if (avctx->codec_id == AV_CODEC_ID_H263 ||
84
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 303 avctx->codec_id == AV_CODEC_ID_H263P ||
85
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 303 avctx->codec_id == AV_CODEC_ID_MPEG4)
86 226 return avctx->pix_fmt = ff_get_format(avctx, h263_hwaccel_pixfmt_list_420);
87
88 97 return AV_PIX_FMT_YUV420P;
89 }
90
91 290 av_cold int ff_h263_decode_init(AVCodecContext *avctx)
92 {
93 290 H263DecContext *const h = avctx->priv_data;
94 290 MPVContext *const s = &h->c;
95 MPVUnquantDSPContext unquant_dsp_ctx;
96 int ret;
97
98 290 s->out_format = FMT_H263;
99
100 // set defaults
101 290 ret = ff_mpv_decode_init(s, avctx);
102
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 290 if (ret < 0)
103 ✗ return ret;
104
105 290 h->decode_mb = ff_h263_decode_mb;
106 290 s->low_delay = 1;
107
108 290 s->y_dc_scale_table =
109 290 s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
110
111 290 ff_permute_scantable(h->permutated_intra_h_scantable, ff_alternate_horizontal_scan,
112 290 s->idsp.idct_permutation);
113 290 ff_permute_scantable(h->permutated_intra_v_scantable, ff_alternate_vertical_scan,
114 290 s->idsp.idct_permutation);
115
116 290 ff_mpv_unquantize_init(&unquant_dsp_ctx,
117 avctx->flags & AV_CODEC_FLAG_BITEXACT, 0);
118 // dct_unquantize defaults for H.263;
119 // they might change on a per-frame basis for MPEG-4;
120 // dct_unquantize_inter will be unset for MSMPEG4 codecs later.
121 290 s->dct_unquantize_intra = unquant_dsp_ctx.dct_unquantize_h263_intra;
122 290 s->dct_unquantize_inter = unquant_dsp_ctx.dct_unquantize_h263_inter;
123
124 /* select sub codec */
125
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 290 switch (avctx->codec->id) {
126 20 case AV_CODEC_ID_H263:
127 case AV_CODEC_ID_H263P:
128 20 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
129 20 h->decode_header = ff_h263_decode_picture_header;
130 20 break;
131 185 case AV_CODEC_ID_MPEG4:
132 185 break;
133 2 case AV_CODEC_ID_MSMPEG4V1:
134 2 s->h263_pred = 1;
135 2 s->msmpeg4_version = MSMP4_V1;
136 2 break;
137 9 case AV_CODEC_ID_MSMPEG4V2:
138 9 s->h263_pred = 1;
139 9 s->msmpeg4_version = MSMP4_V2;
140 9 break;
141 13 case AV_CODEC_ID_MSMPEG4V3:
142 13 s->h263_pred = 1;
143 13 s->msmpeg4_version = MSMP4_V3;
144 13 break;
145 9 case AV_CODEC_ID_WMV1:
146 9 s->h263_pred = 1;
147 9 s->msmpeg4_version = MSMP4_WMV1;
148 9 break;
149 12 case AV_CODEC_ID_WMV2:
150 12 s->h263_pred = 1;
151 12 s->msmpeg4_version = MSMP4_WMV2;
152 12 break;
153 20 case AV_CODEC_ID_RV10:
154 case AV_CODEC_ID_RV20:
155 20 break;
156 #if CONFIG_H263I_DECODER
157 ✗ case AV_CODEC_ID_H263I:
158 ✗ h->decode_header = ff_intel_h263_decode_picture_header;
159 ✗ break;
160 #endif
161 #if CONFIG_FLV_DECODER
162 20 case AV_CODEC_ID_FLV1:
163 20 h->decode_header = ff_flv_decode_picture_header;
164 20 break;
165 #endif
166 ✗ default:
167 ✗ av_unreachable("Switch contains a case for every codec using ff_h263_decode_init()");
168 }
169
170
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 290 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
171 ✗ if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
172 ✗ h->ehc_mode = 1;
173
174 /* for H.263, we allocate the images after having read the header */
175
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 290 if (avctx->codec->id != AV_CODEC_ID_H263 &&
176
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 270 avctx->codec->id != AV_CODEC_ID_H263P &&
177
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 270 avctx->codec->id != AV_CODEC_ID_MPEG4) {
178 85 avctx->pix_fmt = h263_get_format(avctx);
179
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 85 if ((ret = ff_mpv_common_init(s)) < 0)
180 ✗ return ret;
181 }
182
183 290 ff_h263dsp_init(&s->h263dsp);
184 290 ff_h263_decode_init_vlc();
185
186 290 return 0;
187 }
188
189 90854 static void report_decode_progress(H263DecContext *const h)
190 {
191
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 90854 if (h->c.pict_type != AV_PICTURE_TYPE_B && !h->partitioned_frame && !h->c.er.error_occurred)
192 74424 ff_thread_progress_report(&h->c.cur_pic.ptr->progress, h->c.mb_y);
193 90854 }
194
195 11948 static int decode_slice(H263DecContext *const h)
196 {
197 23896 const int part_mask = h->partitioned_frame
198
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 11948 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
199 11948 const int mb_size = 16 >> h->c.avctx->lowres;
200 int ret;
201
202 11948 h->last_resync_gb = h->gb;
203 11948 h->c.first_slice_line = 1;
204 11948 h->c.resync_mb_x = h->c.mb_x;
205 11948 h->c.resync_mb_y = h->c.mb_y;
206
207 11948 ff_set_qscale(&h->c, h->c.qscale);
208
209 #if CONFIG_MPEG4_DECODER
210
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 11948 if (h->c.studio_profile) {
211
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 30 if ((ret = ff_mpeg4_decode_studio_slice_header(h)) < 0)
212 ✗ return ret;
213 }
214 #endif
215
216
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 11948 if (h->c.avctx->hwaccel) {
217 ✗ const uint8_t *start = h->gb.buffer + get_bits_count(&h->gb) / 8;
218 ✗ ret = FF_HW_CALL(h->c.avctx, decode_slice, start,
219 get_bits_bytesize(&h->gb, 0) - get_bits_count(&h->gb) / 8);
220 // ensure we exit decode loop
221 ✗ h->c.mb_y = h->c.mb_height;
222 ✗ return ret;
223 }
224
225 #if CONFIG_MPEG4_DECODER
226
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 11948 if (h->partitioned_frame) {
227 1728 const int qscale = h->c.qscale;
228
229 av_assert1(h->c.codec_id == AV_CODEC_ID_MPEG4);
230
231 1728 ret = ff_mpeg4_decode_partitions(h);
232
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 1728 if (ret < 0)
233 ✗ return ret;
234
235 /* restore variables which were modified */
236 1728 h->c.first_slice_line = 1;
237 1728 h->c.mb_x = h->c.resync_mb_x;
238 1728 h->c.mb_y = h->c.resync_mb_y;
239 1728 ff_set_qscale(&h->c, qscale);
240 }
241 #endif
242
243
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 95153 for (; h->c.mb_y < h->c.mb_height; h->c.mb_y++) {
244 /* per-row end of slice checks */
245
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 93807 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
246
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 19665 if (h->c.resync_mb_y + h->slice_height == h->c.mb_y) {
247 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
248 ✗ h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
249
250 ✗ return 0;
251 }
252 }
253
254
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 93807 if (h->c.msmpeg4_version == MSMP4_V1) {
255 750 h->last_dc[0] =
256 750 h->last_dc[1] =
257 750 h->last_dc[2] = 128;
258 }
259
260 93807 ff_init_block_index(&h->c);
261
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 2276297 for (; h->c.mb_x < h->c.mb_width; h->c.mb_x++) {
262 int ret;
263
264 2193092 ff_update_block_index(&h->c, h->c.avctx->bits_per_raw_sample,
265 2193092 h->c.avctx->lowres, h->c.chroma_x_shift);
266
267
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 2193092 if (h->c.resync_mb_x == h->c.mb_x && h->c.resync_mb_y + 1 == h->c.mb_y)
268 7349 h->c.first_slice_line = 0;
269
270 /* DCT & quantize */
271
272 2193092 h->c.mv_dir = MV_DIR_FORWARD;
273 2193092 h->c.mv_type = MV_TYPE_16X16;
274 ff_dlog(h->c.avctx, "%d %06X\n",
275 get_bits_count(&h->gb), show_bits(&h->gb, 24));
276
277 ff_tlog(NULL, "Decoding MB at %dx%d\n", h->c.mb_x, h->c.mb_y);
278 2193092 ret = h->decode_mb(h);
279
280
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 2193092 if (h->c.h263_pred || h->c.h263_aic) {
281 1973654 int mb_xy = h->c.mb_y * h->c.mb_stride + h->c.mb_x;
282
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 1973654 if (!h->c.mb_intra) {
283 1738926 ff_h263_clean_intra_table_entries(&h->c, mb_xy);
284 } else
285 234728 h->c.mbintra_table[mb_xy] = 1;
286 }
287
288
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 2193092 if (h->c.pict_type != AV_PICTURE_TYPE_B)
289 1962433 ff_h263_update_motion_val(&h->c);
290
291
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 2193092 if (ret < 0) {
292 10602 const int xy = h->c.mb_x + h->c.mb_y * h->c.mb_stride;
293
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 10602 if (ret == SLICE_END) {
294 10602 ff_mpv_reconstruct_mb(&h->c, h->block);
295
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 10602 if (h->loop_filter)
296 ✗ ff_h263_loop_filter(&h->c);
297
298 10602 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
299 h->c.mb_x, h->c.mb_y, ER_MB_END & part_mask);
300
301 10602 h->padding_bug_score--;
302
303
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 10602 if (++h->c.mb_x >= h->c.mb_width) {
304 7649 h->c.mb_x = 0;
305 7649 report_decode_progress(h);
306 7649 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
307 7649 h->c.mb_y++;
308 }
309 10602 return 0;
310 ✗ } else if (ret == SLICE_NOEND) {
311 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
312 "Slice mismatch at MB: %d\n", xy);
313 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
314 ✗ h->c.mb_x + 1, h->c.mb_y,
315 ER_MB_END & part_mask);
316 ✗ return AVERROR_INVALIDDATA;
317 }
318 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
319 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
320 h->c.mb_x, h->c.mb_y, ER_MB_ERROR & part_mask);
321
322 ✗ if ((h->c.avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&h->gb) > 0)
323 ✗ continue;
324 ✗ return AVERROR_INVALIDDATA;
325 }
326
327 2182490 ff_mpv_reconstruct_mb(&h->c, h->block);
328
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 2182490 if (h->loop_filter)
329 141300 ff_h263_loop_filter(&h->c);
330 }
331
332 83205 report_decode_progress(h);
333 83205 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
334
335 83205 h->c.mb_x = 0;
336 }
337
338 av_assert1(h->c.mb_x == 0 && h->c.mb_y == h->c.mb_height);
339
340 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
341
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
342 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
343 ✗ get_bits_left(&h->gb) >= 48 &&
344 ✗ show_bits(&h->gb, 24) == 0x4010 &&
345 ✗ !h->data_partitioning)
346 ✗ h->padding_bug_score += 32;
347
348 /* try to detect the padding bug */
349
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
350 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
351 ✗ get_bits_left(&h->gb) >= 0 &&
352 ✗ get_bits_left(&h->gb) < 137 &&
353 ✗ !h->data_partitioning) {
354 ✗ const int bits_count = get_bits_count(&h->gb);
355 ✗ const int bits_left = h->gb.size_in_bits - bits_count;
356
357 ✗ if (bits_left == 0) {
358 ✗ h->padding_bug_score += 16;
359 ✗ } else if (bits_left != 1) {
360 ✗ int v = show_bits(&h->gb, 8);
361 ✗ v |= 0x7F >> (7 - (bits_count & 7));
362
363 ✗ if (v == 0x7F && bits_left <= 8)
364 ✗ h->padding_bug_score--;
365 ✗ else if (v == 0x7F && ((get_bits_count(&h->gb) + 8) & 8) &&
366 bits_left <= 16)
367 ✗ h->padding_bug_score += 4;
368 else
369 ✗ h->padding_bug_score++;
370 }
371 }
372
373
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
374 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
375 ✗ get_bits_left(&h->gb) >= 8 &&
376 ✗ get_bits_left(&h->gb) < 300 &&
377 ✗ h->c.pict_type == AV_PICTURE_TYPE_I &&
378 ✗ show_bits(&h->gb, 8) == 0 &&
379 ✗ !h->data_partitioning) {
380
381 ✗ h->padding_bug_score += 32;
382 }
383
384
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
385 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
386 ✗ get_bits_left(&h->gb) >= 64 &&
387 ✗ AV_RB64(h->gb.buffer + (get_bits_bytesize(&h->gb, 0) - 8)) == 0xCDCDCDCDFC7F0000) {
388
389 ✗ h->padding_bug_score += 32;
390 }
391
392
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 1346 if (h->c.workaround_bugs & FF_BUG_AUTODETECT) {
393 1346 if (
394
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 1346 (h->padding_bug_score > -2 && !h->data_partitioning))
395 1346 h->c.workaround_bugs |= FF_BUG_NO_PADDING;
396 else
397 ✗ h->c.workaround_bugs &= ~FF_BUG_NO_PADDING;
398 }
399
400 // handle formats which don't have unique end markers
401
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 1346 if (h->c.msmpeg4_version != MSMP4_UNUSED || (h->c.workaround_bugs & FF_BUG_NO_PADDING)) { // FIXME perhaps solve this more cleanly
402 1346 int left = get_bits_left(&h->gb);
403 1346 int max_extra = 7;
404
405 /* no markers in M$ crap */
406
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 1346 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.pict_type == AV_PICTURE_TYPE_I)
407 90 max_extra += 17;
408
409 /* buggy padding but the frame should still end approximately at
410 * the bitstream end */
411
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412
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 1346 (h->c.avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
413 ✗ max_extra += 48;
414
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 1346 else if ((h->c.workaround_bugs & FF_BUG_NO_PADDING))
415 1346 max_extra += 256 * 256 * 256 * 64;
416
417
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 1346 if (left > max_extra)
418 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
419 "discarding %d junk bits at end, next would be %X\n",
420 left, show_bits(&h->gb, 24));
421
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 1346 else if (left < 0)
422 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
423 else
424 1346 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
425 1346 h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
426
427 1346 return 0;
428 }
429
430 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
431 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
432 get_bits_left(&h->gb), show_bits(&h->gb, 24), h->padding_bug_score);
433
434 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y, h->c.mb_x, h->c.mb_y,
435 ER_MB_END & part_mask);
436
437 ✗ return AVERROR_INVALIDDATA;
438 }
439
440 5751 int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *pict,
441 int *got_frame, AVPacket *avpkt)
442 {
443 5751 H263DecContext *const h = avctx->priv_data;
444 5751 MPVContext *const s = &h->c;
445 5751 const uint8_t *buf = avpkt->data;
446 5751 int buf_size = avpkt->size;
447 int ret;
448 5751 int slice_ret = 0;
449 int bak_width, bak_height;
450
451 /* no supplementary picture */
452
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 5751 if (buf_size == 0) {
453 /* special case for last picture */
454
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 109 if ((!h->c.low_delay || h->skipped_last_frame) && h->c.next_pic.ptr) {
455
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 23 if ((ret = av_frame_ref(pict, h->c.next_pic.ptr->f)) < 0)
456 ✗ return ret;
457
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 23 if (h->skipped_last_frame) {
458 /* If the stream ended with an NVOP, we output the last frame
459 * in display order, but with the props from the last input
460 * packet so that the stream's end time is correct. */
461 ✗ ret = ff_decode_frame_props(avctx, pict);
462 ✗ if (ret < 0)
463 ✗ return ret;
464 }
465
466 23 ff_mpv_unref_picture(&h->c.next_pic);
467
468 23 *got_frame = 1;
469 }
470
471 109 return 0;
472 }
473
474 // h->gb might be overridden in ff_mpeg4_decode_picture_header() below.
475 5642 ret = init_get_bits8(&h->gb, buf, buf_size);
476
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 5642 if (ret < 0)
477 ✗ return ret;
478
479 5642 bak_width = h->c.width;
480 5642 bak_height = h->c.height;
481
482 /* let's go :-) */
483 5642 ret = h->decode_header(h);
484
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 5642 if (ret < 0 || ret == FRAME_SKIPPED) {
485 ✗ if ( h->c.width != bak_width
486 ✗ || h->c.height != bak_height) {
487 ✗ av_log(h->c.avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
488 ✗ h->c.width = bak_width;
489 ✗ h->c.height= bak_height;
490
491 }
492 }
493
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 5642 if (ret == FRAME_SKIPPED)
494 ✗ return buf_size;
495
496 /* skip if the header was thrashed */
497
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 5642 if (ret < 0) {
498 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "header damaged\n");
499 ✗ return ret;
500 }
501
502
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 5642 if (!h->c.context_initialized) {
503 193 avctx->pix_fmt = h263_get_format(avctx);
504
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 193 if ((ret = ff_mpv_common_init(s)) < 0)
505 ✗ return ret;
506 }
507
508 5642 avctx->has_b_frames = !h->c.low_delay;
509
510 #if CONFIG_MPEG4_DECODER
511
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 5642 if (avctx->codec_id == AV_CODEC_ID_MPEG4) {
512
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 3517 if (h->c.pict_type != AV_PICTURE_TYPE_B && h->c.mb_num/2 > get_bits_left(&h->gb))
513 ✗ return AVERROR_INVALIDDATA;
514 3517 ff_mpeg4_workaround_bugs(avctx);
515
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 3517 if (h->c.studio_profile != (h->c.idsp.idct == NULL))
516 1 ff_mpv_idct_init(s);
517 }
518 #endif
519
520 /* After H.263 & MPEG-4 header decode we have the height, width,
521 * and other parameters. So then we could init the picture. */
522
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 5642 if (h->c.width != avctx->coded_width ||
523
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 5596 h->c.height != avctx->coded_height ||
524
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 5596 h->c.context_reinit) {
525 /* H.263 could change picture size any time */
526 47 h->c.context_reinit = 0;
527
528 47 ret = ff_set_dimensions(avctx, h->c.width, h->c.height);
529
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 47 if (ret < 0)
530 ✗ return ret;
531
532 47 ff_set_sar(avctx, avctx->sample_aspect_ratio);
533
534
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 47 if ((ret = ff_mpv_common_frame_size_change(s)))
535 ✗ return ret;
536
537
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 47 if (avctx->pix_fmt != h263_get_format(avctx)) {
538 ✗ av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
539 ✗ avctx->pix_fmt = AV_PIX_FMT_NONE;
540 ✗ return AVERROR_UNKNOWN;
541 }
542 }
543
544 /* skip B-frames if we don't have reference frames */
545
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 5642 if (!h->c.last_pic.ptr &&
546
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 369 (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.droppable))
547 ✗ return buf_size;
548
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 5642 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
549
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 174 h->c.pict_type == AV_PICTURE_TYPE_B) ||
550
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 5642 (avctx->skip_frame >= AVDISCARD_NONKEY &&
551
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 174 h->c.pict_type != AV_PICTURE_TYPE_I) ||
552
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 5595 avctx->skip_frame >= AVDISCARD_ALL)
553 171 return buf_size;
554
555
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 5471 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
556 ✗ return ret;
557
558
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 5471 if (!h->divx_packed)
559 5456 ff_thread_finish_setup(avctx);
560
561
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 5471 if (avctx->hwaccel) {
562 ✗ ret = FF_HW_CALL(avctx, start_frame, NULL,
563 h->gb.buffer, get_bits_bytesize(&h->gb, 0));
564 ✗ if (ret < 0 )
565 ✗ return ret;
566 }
567
568 5471 ff_mpv_er_frame_start_ext(s, h->partitioned_frame,
569 5471 s->pp_time, s->pb_time);
570
571 /* the second part of the wmv2 header contains the MB skip bits which
572 * are stored in current_picture->mb_type which is not available before
573 * ff_mpv_frame_start() */
574 #if CONFIG_WMV2_DECODER
575
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 5471 if (h->c.msmpeg4_version == MSMP4_WMV2) {
576 674 ret = ff_wmv2_decode_secondary_picture_header(h);
577
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 674 if (ret < 0)
578 ✗ return ret;
579
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 674 if (ret == 1)
580 3 goto frame_end;
581 }
582 #endif
583
584 /* decode each macroblock */
585 5468 h->c.mb_x = 0;
586 5468 h->c.mb_y = 0;
587
588 5468 slice_ret = decode_slice(h);
589
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 11948 while (h->c.mb_y < h->c.mb_height) {
590
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 6480 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
591 ✗ if (h->slice_height == 0 || h->c.mb_x != 0 || slice_ret < 0 ||
592 ✗ (h->c.mb_y % h->slice_height) != 0 || get_bits_left(&h->gb) < 0)
593 break;
594 } else {
595 6480 int prev_x = h->c.mb_x, prev_y = h->c.mb_y;
596
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 6480 if (ff_h263_resync(h) < 0)
597 ✗ break;
598
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 6480 if (prev_y * h->c.mb_width + prev_x < h->c.mb_y * h->c.mb_width + h->c.mb_x)
599 29 h->c.er.error_occurred = 1;
600 }
601
602
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 6480 if (h->c.msmpeg4_version < MSMP4_WMV1 && h->c.h263_pred)
603 3936 ff_mpeg4_clean_buffers(s);
604
605
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 6480 if (decode_slice(h) < 0)
606 ✗ slice_ret = AVERROR_INVALIDDATA;
607 }
608
609
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 5468 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.msmpeg4_version < MSMP4_WMV1 &&
610
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 475 h->c.pict_type == AV_PICTURE_TYPE_I)
611
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 44 if (!CONFIG_MSMPEG4DEC ||
612 44 ff_msmpeg4_decode_ext_header(h, buf_size) < 0)
613 ✗ h->c.er.error_status_table[h->c.mb_num - 1] = ER_MB_ERROR;
614
615 5468 frame_end:
616
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 5471 if (!h->c.studio_profile)
617 5470 ff_er_frame_end(&h->c.er, NULL);
618
619
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 5471 if (avctx->hwaccel) {
620 ✗ ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
621 ✗ if (ret < 0)
622 ✗ return ret;
623 }
624
625 5471 ff_mpv_frame_end(s);
626
627 #if CONFIG_MPEG4_DECODER
628
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 5471 if (avctx->codec_id == AV_CODEC_ID_MPEG4)
629 3369 ff_mpeg4_frame_end(avctx, avpkt);
630 #endif
631
632 av_assert1(h->c.pict_type == h->c.cur_pic.ptr->f->pict_type);
633
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 5471 if (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.low_delay) {
634
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 5022 if ((ret = av_frame_ref(pict, h->c.cur_pic.ptr->f)) < 0)
635 ✗ return ret;
636 5022 ff_print_debug_info(s, h->c.cur_pic.ptr, pict);
637 5022 ff_mpv_export_qp_table(s, pict, h->c.cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
638
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 449 } else if (h->c.last_pic.ptr) {
639
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 423 if ((ret = av_frame_ref(pict, h->c.last_pic.ptr->f)) < 0)
640 ✗ return ret;
641 423 ff_print_debug_info(s, h->c.last_pic.ptr, pict);
642 423 ff_mpv_export_qp_table(s, pict, h->c.last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
643 }
644
645
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 5471 if (h->c.last_pic.ptr || h->c.low_delay) {
646
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 5445 if ( pict->format == AV_PIX_FMT_YUV420P
647
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 5444 && (h->c.codec_tag == AV_RL32("GEOV") || h->c.codec_tag == AV_RL32("GEOX"))) {
648 ✗ for (int p = 0; p < 3; p++) {
649 ✗ int h = AV_CEIL_RSHIFT(pict->height, !!p);
650
651 ✗ pict->data[p] += (h - 1) * pict->linesize[p];
652 ✗ pict->linesize[p] *= -1;
653 }
654 }
655 5445 *got_frame = 1;
656 }
657
658
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 5471 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
659 ✗ return slice_ret;
660 else
661 5471 return buf_size;
662 }
663
664 static const AVCodecHWConfigInternal *const h263_hw_config_list[] = {
665 #if CONFIG_H263_VAAPI_HWACCEL
666 HWACCEL_VAAPI(h263),
667 #endif
668 #if CONFIG_MPEG4_NVDEC_HWACCEL
669 HWACCEL_NVDEC(mpeg4),
670 #endif
671 #if CONFIG_MPEG4_VDPAU_HWACCEL
672 HWACCEL_VDPAU(mpeg4),
673 #endif
674 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
675 HWACCEL_VIDEOTOOLBOX(h263),
676 #endif
677 NULL
678 };
679
680 const FFCodec ff_h263_decoder = {
681 .p.name = "h263",
682 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
683 .p.type = AVMEDIA_TYPE_VIDEO,
684 .p.id = AV_CODEC_ID_H263,
685 .priv_data_size = sizeof(H263DecContext),
686 .init = ff_h263_decode_init,
687 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
688 .close = ff_mpv_decode_close,
689 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
690 AV_CODEC_CAP_DELAY,
691 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
692 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
693 .flush = ff_mpeg_flush,
694 .p.max_lowres = 3,
695 .hw_configs = h263_hw_config_list,
696 };
697
698 const FFCodec ff_h263p_decoder = {
699 .p.name = "h263p",
700 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
701 .p.type = AVMEDIA_TYPE_VIDEO,
702 .p.id = AV_CODEC_ID_H263P,
703 .priv_data_size = sizeof(H263DecContext),
704 .init = ff_h263_decode_init,
705 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
706 .close = ff_mpv_decode_close,
707 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
708 AV_CODEC_CAP_DELAY,
709 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
710 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
711 .flush = ff_mpeg_flush,
712 .p.max_lowres = 3,
713 .hw_configs = h263_hw_config_list,
714 };
715