FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h263dec.c
Date: 2025-10-19 14:07:46
Exec Total Coverage
Lines: 245 354 69.2%
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_mpv_unquantize_init(&unquant_dsp_ctx,
112 avctx->flags & AV_CODEC_FLAG_BITEXACT, 0);
113 // dct_unquantize defaults for H.263;
114 // they might change on a per-frame basis for MPEG-4;
115 // dct_unquantize_inter will be unset for MSMPEG4 codecs later.
116 290 s->dct_unquantize_intra = unquant_dsp_ctx.dct_unquantize_h263_intra;
117 290 s->dct_unquantize_inter = unquant_dsp_ctx.dct_unquantize_h263_inter;
118
119 /* select sub codec */
120
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 290 switch (avctx->codec->id) {
121 20 case AV_CODEC_ID_H263:
122 case AV_CODEC_ID_H263P:
123 20 avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
124 20 h->decode_header = ff_h263_decode_picture_header;
125 20 break;
126 185 case AV_CODEC_ID_MPEG4:
127 185 break;
128 2 case AV_CODEC_ID_MSMPEG4V1:
129 2 s->h263_pred = 1;
130 2 s->msmpeg4_version = MSMP4_V1;
131 2 break;
132 9 case AV_CODEC_ID_MSMPEG4V2:
133 9 s->h263_pred = 1;
134 9 s->msmpeg4_version = MSMP4_V2;
135 9 break;
136 13 case AV_CODEC_ID_MSMPEG4V3:
137 13 s->h263_pred = 1;
138 13 s->msmpeg4_version = MSMP4_V3;
139 13 break;
140 9 case AV_CODEC_ID_WMV1:
141 9 s->h263_pred = 1;
142 9 s->msmpeg4_version = MSMP4_WMV1;
143 9 break;
144 12 case AV_CODEC_ID_WMV2:
145 12 s->h263_pred = 1;
146 12 s->msmpeg4_version = MSMP4_WMV2;
147 12 break;
148 20 case AV_CODEC_ID_RV10:
149 case AV_CODEC_ID_RV20:
150 20 break;
151 #if CONFIG_H263I_DECODER
152 ✗ case AV_CODEC_ID_H263I:
153 ✗ h->decode_header = ff_intel_h263_decode_picture_header;
154 ✗ break;
155 #endif
156 #if CONFIG_FLV_DECODER
157 20 case AV_CODEC_ID_FLV1:
158 20 h->decode_header = ff_flv_decode_picture_header;
159 20 break;
160 #endif
161 ✗ default:
162 ✗ av_unreachable("Switch contains a case for every codec using ff_h263_decode_init()");
163 }
164
165
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 290 if (avctx->codec_tag == AV_RL32("L263") || avctx->codec_tag == AV_RL32("S263"))
166 ✗ if (avctx->extradata_size == 56 && avctx->extradata[0] == 1)
167 ✗ h->ehc_mode = 1;
168
169 /* for H.263, we allocate the images after having read the header */
170
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 290 if (avctx->codec->id != AV_CODEC_ID_H263 &&
171
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 270 avctx->codec->id != AV_CODEC_ID_H263P &&
172
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 270 avctx->codec->id != AV_CODEC_ID_MPEG4) {
173 85 avctx->pix_fmt = h263_get_format(avctx);
174
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 85 if ((ret = ff_mpv_common_init(s)) < 0)
175 ✗ return ret;
176 }
177
178 290 ff_h263dsp_init(&s->h263dsp);
179 290 ff_h263_decode_init_vlc();
180
181 290 return 0;
182 }
183
184 90854 static void report_decode_progress(H263DecContext *const h)
185 {
186
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 90854 if (h->c.pict_type != AV_PICTURE_TYPE_B && !h->partitioned_frame && !h->c.er.error_occurred)
187 74424 ff_thread_progress_report(&h->c.cur_pic.ptr->progress, h->c.mb_y);
188 90854 }
189
190 11948 static int decode_slice(H263DecContext *const h)
191 {
192 23896 const int part_mask = h->partitioned_frame
193
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 11948 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
194 11948 const int mb_size = 16 >> h->c.avctx->lowres;
195 int ret;
196
197 11948 h->last_resync_gb = h->gb;
198 11948 h->c.first_slice_line = 1;
199 11948 h->c.resync_mb_x = h->c.mb_x;
200 11948 h->c.resync_mb_y = h->c.mb_y;
201
202 11948 ff_set_qscale(&h->c, h->c.qscale);
203
204 #if CONFIG_MPEG4_DECODER
205
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 11948 if (h->c.studio_profile) {
206
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 30 if ((ret = ff_mpeg4_decode_studio_slice_header(h)) < 0)
207 ✗ return ret;
208 }
209 #endif
210
211
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 11948 if (h->c.avctx->hwaccel) {
212 ✗ const uint8_t *start = h->gb.buffer + get_bits_count(&h->gb) / 8;
213 ✗ ret = FF_HW_CALL(h->c.avctx, decode_slice, start,
214 get_bits_bytesize(&h->gb, 0) - get_bits_count(&h->gb) / 8);
215 // ensure we exit decode loop
216 ✗ h->c.mb_y = h->c.mb_height;
217 ✗ return ret;
218 }
219
220 #if CONFIG_MPEG4_DECODER
221
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 11948 if (h->partitioned_frame) {
222 1728 const int qscale = h->c.qscale;
223
224 av_assert1(h->c.codec_id == AV_CODEC_ID_MPEG4);
225
226 1728 ret = ff_mpeg4_decode_partitions(h);
227
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 1728 if (ret < 0)
228 ✗ return ret;
229
230 /* restore variables which were modified */
231 1728 h->c.first_slice_line = 1;
232 1728 h->c.mb_x = h->c.resync_mb_x;
233 1728 h->c.mb_y = h->c.resync_mb_y;
234 1728 ff_set_qscale(&h->c, qscale);
235 }
236 #endif
237
238
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 95153 for (; h->c.mb_y < h->c.mb_height; h->c.mb_y++) {
239 /* per-row end of slice checks */
240
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 93807 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
241
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 19665 if (h->c.resync_mb_y + h->slice_height == h->c.mb_y) {
242 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
243 ✗ h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
244
245 ✗ return 0;
246 }
247 }
248
249
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 93807 if (h->c.msmpeg4_version == MSMP4_V1) {
250 750 h->c.last_dc[0] =
251 750 h->c.last_dc[1] =
252 750 h->c.last_dc[2] = 128;
253 }
254
255 93807 ff_init_block_index(&h->c);
256
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 2276297 for (; h->c.mb_x < h->c.mb_width; h->c.mb_x++) {
257 int ret;
258
259 2193092 ff_update_block_index(&h->c, h->c.avctx->bits_per_raw_sample,
260 2193092 h->c.avctx->lowres, h->c.chroma_x_shift);
261
262
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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)
263 7349 h->c.first_slice_line = 0;
264
265 /* DCT & quantize */
266
267 2193092 h->c.mv_dir = MV_DIR_FORWARD;
268 2193092 h->c.mv_type = MV_TYPE_16X16;
269 ff_dlog(h->c.avctx, "%d %06X\n",
270 get_bits_count(&h->gb), show_bits(&h->gb, 24));
271
272 ff_tlog(NULL, "Decoding MB at %dx%d\n", h->c.mb_x, h->c.mb_y);
273 2193092 ret = h->decode_mb(h);
274
275
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 2193092 if (h->c.h263_pred || h->c.h263_aic) {
276 1973654 int mb_xy = h->c.mb_y * h->c.mb_stride + h->c.mb_x;
277
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 1973654 if (!h->c.mb_intra) {
278 1738926 ff_h263_clean_intra_table_entries(&h->c, mb_xy);
279 } else
280 234728 h->c.mbintra_table[mb_xy] = 1;
281 }
282
283
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 2193092 if (h->c.pict_type != AV_PICTURE_TYPE_B)
284 1962433 ff_h263_update_motion_val(&h->c);
285
286
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 2193092 if (ret < 0) {
287 10602 const int xy = h->c.mb_x + h->c.mb_y * h->c.mb_stride;
288
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 10602 if (ret == SLICE_END) {
289 10602 ff_mpv_reconstruct_mb(&h->c, h->block);
290
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 10602 if (h->loop_filter)
291 ✗ ff_h263_loop_filter(&h->c);
292
293 10602 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
294 h->c.mb_x, h->c.mb_y, ER_MB_END & part_mask);
295
296 10602 h->padding_bug_score--;
297
298
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 10602 if (++h->c.mb_x >= h->c.mb_width) {
299 7649 h->c.mb_x = 0;
300 7649 report_decode_progress(h);
301 7649 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
302 7649 h->c.mb_y++;
303 }
304 10602 return 0;
305 ✗ } else if (ret == SLICE_NOEND) {
306 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
307 "Slice mismatch at MB: %d\n", xy);
308 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
309 ✗ h->c.mb_x + 1, h->c.mb_y,
310 ER_MB_END & part_mask);
311 ✗ return AVERROR_INVALIDDATA;
312 }
313 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
314 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
315 h->c.mb_x, h->c.mb_y, ER_MB_ERROR & part_mask);
316
317 ✗ if ((h->c.avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&h->gb) > 0)
318 ✗ continue;
319 ✗ return AVERROR_INVALIDDATA;
320 }
321
322 2182490 ff_mpv_reconstruct_mb(&h->c, h->block);
323
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 2182490 if (h->loop_filter)
324 141300 ff_h263_loop_filter(&h->c);
325 }
326
327 83205 report_decode_progress(h);
328 83205 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
329
330 83205 h->c.mb_x = 0;
331 }
332
333 av_assert1(h->c.mb_x == 0 && h->c.mb_y == h->c.mb_height);
334
335 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
336
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
337 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
338 ✗ get_bits_left(&h->gb) >= 48 &&
339 ✗ show_bits(&h->gb, 24) == 0x4010 &&
340 ✗ !h->data_partitioning)
341 ✗ h->padding_bug_score += 32;
342
343 /* try to detect the padding bug */
344
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
345 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
346 ✗ get_bits_left(&h->gb) >= 0 &&
347 ✗ get_bits_left(&h->gb) < 137 &&
348 ✗ !h->data_partitioning) {
349 ✗ const int bits_count = get_bits_count(&h->gb);
350 ✗ const int bits_left = h->gb.size_in_bits - bits_count;
351
352 ✗ if (bits_left == 0) {
353 ✗ h->padding_bug_score += 16;
354 ✗ } else if (bits_left != 1) {
355 ✗ int v = show_bits(&h->gb, 8);
356 ✗ v |= 0x7F >> (7 - (bits_count & 7));
357
358 ✗ if (v == 0x7F && bits_left <= 8)
359 ✗ h->padding_bug_score--;
360 ✗ else if (v == 0x7F && ((get_bits_count(&h->gb) + 8) & 8) &&
361 bits_left <= 16)
362 ✗ h->padding_bug_score += 4;
363 else
364 ✗ h->padding_bug_score++;
365 }
366 }
367
368
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
369 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
370 ✗ get_bits_left(&h->gb) >= 8 &&
371 ✗ get_bits_left(&h->gb) < 300 &&
372 ✗ h->c.pict_type == AV_PICTURE_TYPE_I &&
373 ✗ show_bits(&h->gb, 8) == 0 &&
374 ✗ !h->data_partitioning) {
375
376 ✗ h->padding_bug_score += 32;
377 }
378
379
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
380 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
381 ✗ get_bits_left(&h->gb) >= 64 &&
382 ✗ AV_RB64(h->gb.buffer + (get_bits_bytesize(&h->gb, 0) - 8)) == 0xCDCDCDCDFC7F0000) {
383
384 ✗ h->padding_bug_score += 32;
385 }
386
387
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 1346 if (h->c.workaround_bugs & FF_BUG_AUTODETECT) {
388 1346 if (
389
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 1346 (h->padding_bug_score > -2 && !h->data_partitioning))
390 1346 h->c.workaround_bugs |= FF_BUG_NO_PADDING;
391 else
392 ✗ h->c.workaround_bugs &= ~FF_BUG_NO_PADDING;
393 }
394
395 // handle formats which don't have unique end markers
396
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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
397 1346 int left = get_bits_left(&h->gb);
398 1346 int max_extra = 7;
399
400 /* no markers in M$ crap */
401
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 1346 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.pict_type == AV_PICTURE_TYPE_I)
402 90 max_extra += 17;
403
404 /* buggy padding but the frame should still end approximately at
405 * the bitstream end */
406
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 1346 if ((h->c.workaround_bugs & FF_BUG_NO_PADDING) &&
407
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 1346 (h->c.avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
408 ✗ max_extra += 48;
409
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 1346 else if ((h->c.workaround_bugs & FF_BUG_NO_PADDING))
410 1346 max_extra += 256 * 256 * 256 * 64;
411
412
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 1346 if (left > max_extra)
413 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
414 "discarding %d junk bits at end, next would be %X\n",
415 left, show_bits(&h->gb, 24));
416
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 1346 else if (left < 0)
417 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
418 else
419 1346 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
420 1346 h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
421
422 1346 return 0;
423 }
424
425 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
426 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
427 get_bits_left(&h->gb), show_bits(&h->gb, 24), h->padding_bug_score);
428
429 ✗ 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,
430 ER_MB_END & part_mask);
431
432 ✗ return AVERROR_INVALIDDATA;
433 }
434
435 5751 int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *pict,
436 int *got_frame, AVPacket *avpkt)
437 {
438 5751 H263DecContext *const h = avctx->priv_data;
439 5751 MPVContext *const s = &h->c;
440 5751 const uint8_t *buf = avpkt->data;
441 5751 int buf_size = avpkt->size;
442 int ret;
443 5751 int slice_ret = 0;
444 int bak_width, bak_height;
445
446 /* no supplementary picture */
447
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 5751 if (buf_size == 0) {
448 /* special case for last picture */
449
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 109 if ((!h->c.low_delay || h->skipped_last_frame) && h->c.next_pic.ptr) {
450
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 23 if ((ret = av_frame_ref(pict, h->c.next_pic.ptr->f)) < 0)
451 ✗ return ret;
452
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 23 if (h->skipped_last_frame) {
453 /* If the stream ended with an NVOP, we output the last frame
454 * in display order, but with the props from the last input
455 * packet so that the stream's end time is correct. */
456 ✗ ret = ff_decode_frame_props(avctx, pict);
457 ✗ if (ret < 0)
458 ✗ return ret;
459 }
460
461 23 ff_mpv_unref_picture(&h->c.next_pic);
462
463 23 *got_frame = 1;
464 }
465
466 109 return 0;
467 }
468
469 // h->gb might be overridden in ff_mpeg4_decode_picture_header() below.
470 5642 ret = init_get_bits8(&h->gb, buf, buf_size);
471
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 5642 if (ret < 0)
472 ✗ return ret;
473
474 5642 bak_width = h->c.width;
475 5642 bak_height = h->c.height;
476
477 /* let's go :-) */
478 5642 ret = h->decode_header(h);
479
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 5642 if (ret < 0 || ret == FRAME_SKIPPED) {
480 ✗ if ( h->c.width != bak_width
481 ✗ || h->c.height != bak_height) {
482 ✗ av_log(h->c.avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
483 ✗ h->c.width = bak_width;
484 ✗ h->c.height= bak_height;
485
486 }
487 }
488
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 5642 if (ret == FRAME_SKIPPED)
489 ✗ return buf_size;
490
491 /* skip if the header was thrashed */
492
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 5642 if (ret < 0) {
493 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "header damaged\n");
494 ✗ return ret;
495 }
496
497
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 5642 if (!h->c.context_initialized) {
498 193 avctx->pix_fmt = h263_get_format(avctx);
499
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 193 if ((ret = ff_mpv_common_init(s)) < 0)
500 ✗ return ret;
501 }
502
503 5642 avctx->has_b_frames = !h->c.low_delay;
504
505 #if CONFIG_MPEG4_DECODER
506
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 5642 if (avctx->codec_id == AV_CODEC_ID_MPEG4) {
507
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 3517 if (h->c.pict_type != AV_PICTURE_TYPE_B && h->c.mb_num/2 > get_bits_left(&h->gb))
508 ✗ return AVERROR_INVALIDDATA;
509 3517 ff_mpeg4_workaround_bugs(avctx);
510
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 3517 if (h->c.studio_profile != (h->c.idsp.idct == NULL))
511 1 ff_mpv_idct_init(s);
512 }
513 #endif
514
515 /* After H.263 & MPEG-4 header decode we have the height, width,
516 * and other parameters. So then we could init the picture. */
517
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 5642 if (h->c.width != avctx->coded_width ||
518
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 5596 h->c.height != avctx->coded_height ||
519
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 5596 h->c.context_reinit) {
520 /* H.263 could change picture size any time */
521 47 h->c.context_reinit = 0;
522
523 47 ret = ff_set_dimensions(avctx, h->c.width, h->c.height);
524
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 47 if (ret < 0)
525 ✗ return ret;
526
527 47 ff_set_sar(avctx, avctx->sample_aspect_ratio);
528
529
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 47 if ((ret = ff_mpv_common_frame_size_change(s)))
530 ✗ return ret;
531
532
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 47 if (avctx->pix_fmt != h263_get_format(avctx)) {
533 ✗ av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
534 ✗ avctx->pix_fmt = AV_PIX_FMT_NONE;
535 ✗ return AVERROR_UNKNOWN;
536 }
537 }
538
539 /* skip B-frames if we don't have reference frames */
540
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 5642 if (!h->c.last_pic.ptr &&
541
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 369 (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.droppable))
542 ✗ return buf_size;
543
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 5642 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
544
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 174 h->c.pict_type == AV_PICTURE_TYPE_B) ||
545
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 5642 (avctx->skip_frame >= AVDISCARD_NONKEY &&
546
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 174 h->c.pict_type != AV_PICTURE_TYPE_I) ||
547
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 5595 avctx->skip_frame >= AVDISCARD_ALL)
548 171 return buf_size;
549
550
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 5471 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
551 ✗ return ret;
552
553
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 5471 if (!h->divx_packed)
554 5456 ff_thread_finish_setup(avctx);
555
556
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 5471 if (avctx->hwaccel) {
557 ✗ ret = FF_HW_CALL(avctx, start_frame, NULL,
558 h->gb.buffer, get_bits_bytesize(&h->gb, 0));
559 ✗ if (ret < 0 )
560 ✗ return ret;
561 }
562
563 5471 ff_mpv_er_frame_start_ext(s, h->partitioned_frame,
564 5471 s->pp_time, s->pb_time);
565
566 /* the second part of the wmv2 header contains the MB skip bits which
567 * are stored in current_picture->mb_type which is not available before
568 * ff_mpv_frame_start() */
569 #if CONFIG_WMV2_DECODER
570
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 5471 if (h->c.msmpeg4_version == MSMP4_WMV2) {
571 674 ret = ff_wmv2_decode_secondary_picture_header(h);
572
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 674 if (ret < 0)
573 ✗ return ret;
574
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 674 if (ret == 1)
575 3 goto frame_end;
576 }
577 #endif
578
579 /* decode each macroblock */
580 5468 h->c.mb_x = 0;
581 5468 h->c.mb_y = 0;
582
583 5468 slice_ret = decode_slice(h);
584
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 11948 while (h->c.mb_y < h->c.mb_height) {
585
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 6480 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
586 ✗ if (h->slice_height == 0 || h->c.mb_x != 0 || slice_ret < 0 ||
587 ✗ (h->c.mb_y % h->slice_height) != 0 || get_bits_left(&h->gb) < 0)
588 break;
589 } else {
590 6480 int prev_x = h->c.mb_x, prev_y = h->c.mb_y;
591
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 6480 if (ff_h263_resync(h) < 0)
592 ✗ break;
593
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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)
594 29 h->c.er.error_occurred = 1;
595 }
596
597
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 6480 if (h->c.msmpeg4_version < MSMP4_WMV1 && h->c.h263_pred)
598 3936 ff_mpeg4_clean_buffers(s);
599
600
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 6480 if (decode_slice(h) < 0)
601 ✗ slice_ret = AVERROR_INVALIDDATA;
602 }
603
604
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 5468 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.msmpeg4_version < MSMP4_WMV1 &&
605
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 475 h->c.pict_type == AV_PICTURE_TYPE_I)
606
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 44 if (!CONFIG_MSMPEG4DEC ||
607 44 ff_msmpeg4_decode_ext_header(h, buf_size) < 0)
608 ✗ h->c.er.error_status_table[h->c.mb_num - 1] = ER_MB_ERROR;
609
610 5468 frame_end:
611
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 5471 if (!h->c.studio_profile)
612 5470 ff_er_frame_end(&h->c.er, NULL);
613
614
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 5471 if (avctx->hwaccel) {
615 ✗ ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
616 ✗ if (ret < 0)
617 ✗ return ret;
618 }
619
620 5471 ff_mpv_frame_end(s);
621
622 #if CONFIG_MPEG4_DECODER
623
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 5471 if (avctx->codec_id == AV_CODEC_ID_MPEG4)
624 3369 ff_mpeg4_frame_end(avctx, avpkt);
625 #endif
626
627 av_assert1(h->c.pict_type == h->c.cur_pic.ptr->f->pict_type);
628
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 5471 if (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.low_delay) {
629
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 5022 if ((ret = av_frame_ref(pict, h->c.cur_pic.ptr->f)) < 0)
630 ✗ return ret;
631 5022 ff_print_debug_info(s, h->c.cur_pic.ptr, pict);
632 5022 ff_mpv_export_qp_table(s, pict, h->c.cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
633
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 449 } else if (h->c.last_pic.ptr) {
634
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 423 if ((ret = av_frame_ref(pict, h->c.last_pic.ptr->f)) < 0)
635 ✗ return ret;
636 423 ff_print_debug_info(s, h->c.last_pic.ptr, pict);
637 423 ff_mpv_export_qp_table(s, pict, h->c.last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
638 }
639
640
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 5471 if (h->c.last_pic.ptr || h->c.low_delay) {
641
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 5445 if ( pict->format == AV_PIX_FMT_YUV420P
642
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 5444 && (h->c.codec_tag == AV_RL32("GEOV") || h->c.codec_tag == AV_RL32("GEOX"))) {
643 ✗ for (int p = 0; p < 3; p++) {
644 ✗ int h = AV_CEIL_RSHIFT(pict->height, !!p);
645
646 ✗ pict->data[p] += (h - 1) * pict->linesize[p];
647 ✗ pict->linesize[p] *= -1;
648 }
649 }
650 5445 *got_frame = 1;
651 }
652
653
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 5471 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
654 ✗ return slice_ret;
655 else
656 5471 return buf_size;
657 }
658
659 static const AVCodecHWConfigInternal *const h263_hw_config_list[] = {
660 #if CONFIG_H263_VAAPI_HWACCEL
661 HWACCEL_VAAPI(h263),
662 #endif
663 #if CONFIG_MPEG4_NVDEC_HWACCEL
664 HWACCEL_NVDEC(mpeg4),
665 #endif
666 #if CONFIG_MPEG4_VDPAU_HWACCEL
667 HWACCEL_VDPAU(mpeg4),
668 #endif
669 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
670 HWACCEL_VIDEOTOOLBOX(h263),
671 #endif
672 NULL
673 };
674
675 const FFCodec ff_h263_decoder = {
676 .p.name = "h263",
677 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
678 .p.type = AVMEDIA_TYPE_VIDEO,
679 .p.id = AV_CODEC_ID_H263,
680 .priv_data_size = sizeof(H263DecContext),
681 .init = ff_h263_decode_init,
682 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
683 .close = ff_mpv_decode_close,
684 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
685 AV_CODEC_CAP_DELAY,
686 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
687 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
688 .flush = ff_mpeg_flush,
689 .p.max_lowres = 3,
690 .hw_configs = h263_hw_config_list,
691 };
692
693 const FFCodec ff_h263p_decoder = {
694 .p.name = "h263p",
695 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
696 .p.type = AVMEDIA_TYPE_VIDEO,
697 .p.id = AV_CODEC_ID_H263P,
698 .priv_data_size = sizeof(H263DecContext),
699 .init = ff_h263_decode_init,
700 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
701 .close = ff_mpv_decode_close,
702 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
703 AV_CODEC_CAP_DELAY,
704 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
705 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
706 .flush = ff_mpeg_flush,
707 .p.max_lowres = 3,
708 .hw_configs = h263_hw_config_list,
709 };
710