FFmpeg coverage

Directory: ../../../ffmpeg/
File: src/libavcodec/h263dec.c
Date: 2025-07-11 09:13:03
Exec Total Coverage
Lines: 245 354 69.2%
Functions: 5 5 100.0%
Branches: 178 323 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 91070 static void report_decode_progress(H263DecContext *const h)
185 {
186
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 91070 if (h->c.pict_type != AV_PICTURE_TYPE_B && !h->partitioned_frame && !h->c.er.error_occurred)
187 74496 ff_thread_progress_report(&h->c.cur_pic.ptr->progress, h->c.mb_y);
188 91070 }
189
190 11960 static int decode_slice(H263DecContext *const h)
191 {
192 23920 const int part_mask = h->partitioned_frame
193
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 11960 ? (ER_AC_END | ER_AC_ERROR) : 0x7F;
194 11960 const int mb_size = 16 >> h->c.avctx->lowres;
195 int ret;
196
197 11960 h->last_resync_gb = h->gb;
198 11960 h->c.first_slice_line = 1;
199 11960 h->c.resync_mb_x = h->c.mb_x;
200 11960 h->c.resync_mb_y = h->c.mb_y;
201
202 11960 ff_set_qscale(&h->c, h->c.qscale);
203
204
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 11960 if (h->c.studio_profile) {
205
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 30 if ((ret = ff_mpeg4_decode_studio_slice_header(h)) < 0)
206 ✗ return ret;
207 }
208
209
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 11960 if (h->c.avctx->hwaccel) {
210 ✗ const uint8_t *start = h->gb.buffer + get_bits_count(&h->gb) / 8;
211 ✗ ret = FF_HW_CALL(h->c.avctx, decode_slice, start, h->gb.buffer_end - start);
212 // ensure we exit decode loop
213 ✗ h->c.mb_y = h->c.mb_height;
214 ✗ return ret;
215 }
216
217
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 11960 if (h->partitioned_frame) {
218 1728 const int qscale = h->c.qscale;
219
220
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 1728 if (CONFIG_MPEG4_DECODER && h->c.codec_id == AV_CODEC_ID_MPEG4)
221
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 1728 if ((ret = ff_mpeg4_decode_partitions(h)) < 0)
222 ✗ return ret;
223
224 /* restore variables which were modified */
225 1728 h->c.first_slice_line = 1;
226 1728 h->c.mb_x = h->c.resync_mb_x;
227 1728 h->c.mb_y = h->c.resync_mb_y;
228 1728 ff_set_qscale(&h->c, qscale);
229 }
230
231
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 95369 for (; h->c.mb_y < h->c.mb_height; h->c.mb_y++) {
232 /* per-row end of slice checks */
233
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 94023 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
234
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 19665 if (h->c.resync_mb_y + h->slice_height == h->c.mb_y) {
235 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
236 ✗ h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
237
238 ✗ return 0;
239 }
240 }
241
242
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 94023 if (h->c.msmpeg4_version == MSMP4_V1) {
243 750 h->c.last_dc[0] =
244 750 h->c.last_dc[1] =
245 750 h->c.last_dc[2] = 128;
246 }
247
248 94023 ff_init_block_index(&h->c);
249
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 2281253 for (; h->c.mb_x < h->c.mb_width; h->c.mb_x++) {
250 int ret;
251
252 2197844 ff_update_block_index(&h->c, h->c.avctx->bits_per_raw_sample,
253 2197844 h->c.avctx->lowres, h->c.chroma_x_shift);
254
255
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 2197844 if (h->c.resync_mb_x == h->c.mb_x && h->c.resync_mb_y + 1 == h->c.mb_y)
256 7361 h->c.first_slice_line = 0;
257
258 /* DCT & quantize */
259
260 2197844 h->c.mv_dir = MV_DIR_FORWARD;
261 2197844 h->c.mv_type = MV_TYPE_16X16;
262 ff_dlog(h->c.avctx, "%d %06X\n",
263 get_bits_count(&h->gb), show_bits(&h->gb, 24));
264
265 ff_tlog(NULL, "Decoding MB at %dx%d\n", h->c.mb_x, h->c.mb_y);
266 2197844 ret = h->decode_mb(h);
267
268
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 2197844 if (h->c.h263_pred || h->c.h263_aic) {
269 1978406 int mb_xy = h->c.mb_y * h->c.mb_stride + h->c.mb_x;
270
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 1978406 if (!h->c.mb_intra) {
271 1742658 ff_h263_clean_intra_table_entries(&h->c, mb_xy);
272 } else
273 235748 h->c.mbintra_table[mb_xy] = 1;
274 }
275
276
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 2197844 if (h->c.pict_type != AV_PICTURE_TYPE_B)
277 1964017 ff_h263_update_motion_val(&h->c);
278
279
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 2197844 if (ret < 0) {
280 10614 const int xy = h->c.mb_x + h->c.mb_y * h->c.mb_stride;
281
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 10614 if (ret == SLICE_END) {
282 10614 ff_mpv_reconstruct_mb(&h->c, h->block);
283
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 10614 if (h->loop_filter)
284 ✗ ff_h263_loop_filter(&h->c);
285
286 10614 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
287 h->c.mb_x, h->c.mb_y, ER_MB_END & part_mask);
288
289 10614 h->padding_bug_score--;
290
291
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 10614 if (++h->c.mb_x >= h->c.mb_width) {
292 7661 h->c.mb_x = 0;
293 7661 report_decode_progress(h);
294 7661 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
295 7661 h->c.mb_y++;
296 }
297 10614 return 0;
298 ✗ } else if (ret == SLICE_NOEND) {
299 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
300 "Slice mismatch at MB: %d\n", xy);
301 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
302 ✗ h->c.mb_x + 1, h->c.mb_y,
303 ER_MB_END & part_mask);
304 ✗ return AVERROR_INVALIDDATA;
305 }
306 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
307 ✗ ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
308 h->c.mb_x, h->c.mb_y, ER_MB_ERROR & part_mask);
309
310 ✗ if ((h->c.avctx->err_recognition & AV_EF_IGNORE_ERR) && get_bits_left(&h->gb) > 0)
311 ✗ continue;
312 ✗ return AVERROR_INVALIDDATA;
313 }
314
315 2187230 ff_mpv_reconstruct_mb(&h->c, h->block);
316
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 2187230 if (h->loop_filter)
317 141300 ff_h263_loop_filter(&h->c);
318 }
319
320 83409 report_decode_progress(h);
321 83409 ff_mpeg_draw_horiz_band(&h->c, h->c.mb_y * mb_size, mb_size);
322
323 83409 h->c.mb_x = 0;
324 }
325
326 av_assert1(h->c.mb_x == 0 && h->c.mb_y == h->c.mb_height);
327
328 // Detect incorrect padding with wrong stuffing codes used by NEC N-02B
329
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
330 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
331 ✗ get_bits_left(&h->gb) >= 48 &&
332 ✗ show_bits(&h->gb, 24) == 0x4010 &&
333 ✗ !h->data_partitioning)
334 ✗ h->padding_bug_score += 32;
335
336 /* try to detect the padding bug */
337
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 1346 if (h->c.codec_id == AV_CODEC_ID_MPEG4 &&
338 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
339 ✗ get_bits_left(&h->gb) >= 0 &&
340 ✗ get_bits_left(&h->gb) < 137 &&
341 ✗ !h->data_partitioning) {
342 ✗ const int bits_count = get_bits_count(&h->gb);
343 ✗ const int bits_left = h->gb.size_in_bits - bits_count;
344
345 ✗ if (bits_left == 0) {
346 ✗ h->padding_bug_score += 16;
347 ✗ } else if (bits_left != 1) {
348 ✗ int v = show_bits(&h->gb, 8);
349 ✗ v |= 0x7F >> (7 - (bits_count & 7));
350
351 ✗ if (v == 0x7F && bits_left <= 8)
352 ✗ h->padding_bug_score--;
353 ✗ else if (v == 0x7F && ((get_bits_count(&h->gb) + 8) & 8) &&
354 bits_left <= 16)
355 ✗ h->padding_bug_score += 4;
356 else
357 ✗ h->padding_bug_score++;
358 }
359 }
360
361
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
362 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
363 ✗ get_bits_left(&h->gb) >= 8 &&
364 ✗ get_bits_left(&h->gb) < 300 &&
365 ✗ h->c.pict_type == AV_PICTURE_TYPE_I &&
366 ✗ show_bits(&h->gb, 8) == 0 &&
367 ✗ !h->data_partitioning) {
368
369 ✗ h->padding_bug_score += 32;
370 }
371
372
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 1346 if (h->c.codec_id == AV_CODEC_ID_H263 &&
373 ✗ (h->c.workaround_bugs & FF_BUG_AUTODETECT) &&
374 ✗ get_bits_left(&h->gb) >= 64 &&
375 ✗ AV_RB64(h->gb.buffer_end - 8) == 0xCDCDCDCDFC7F0000) {
376
377 ✗ h->padding_bug_score += 32;
378 }
379
380
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 1346 if (h->c.workaround_bugs & FF_BUG_AUTODETECT) {
381 1346 if (
382
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 1346 (h->padding_bug_score > -2 && !h->data_partitioning))
383 1346 h->c.workaround_bugs |= FF_BUG_NO_PADDING;
384 else
385 ✗ h->c.workaround_bugs &= ~FF_BUG_NO_PADDING;
386 }
387
388 // handle formats which don't have unique end markers
389
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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
390 1346 int left = get_bits_left(&h->gb);
391 1346 int max_extra = 7;
392
393 /* no markers in M$ crap */
394
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 1346 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.pict_type == AV_PICTURE_TYPE_I)
395 90 max_extra += 17;
396
397 /* buggy padding but the frame should still end approximately at
398 * the bitstream end */
399
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 1346 if ((h->c.workaround_bugs & FF_BUG_NO_PADDING) &&
400
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 1346 (h->c.avctx->err_recognition & (AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
401 ✗ max_extra += 48;
402
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 1346 else if ((h->c.workaround_bugs & FF_BUG_NO_PADDING))
403 1346 max_extra += 256 * 256 * 256 * 64;
404
405
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 1346 if (left > max_extra)
406 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
407 "discarding %d junk bits at end, next would be %X\n",
408 left, show_bits(&h->gb, 24));
409
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 1346 else if (left < 0)
410 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
411 else
412 1346 ff_er_add_slice(&h->c.er, h->c.resync_mb_x, h->c.resync_mb_y,
413 1346 h->c.mb_x - 1, h->c.mb_y, ER_MB_END);
414
415 1346 return 0;
416 }
417
418 ✗ av_log(h->c.avctx, AV_LOG_ERROR,
419 "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
420 get_bits_left(&h->gb), show_bits(&h->gb, 24), h->padding_bug_score);
421
422 ✗ 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,
423 ER_MB_END & part_mask);
424
425 ✗ return AVERROR_INVALIDDATA;
426 }
427
428 5763 int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *pict,
429 int *got_frame, AVPacket *avpkt)
430 {
431 5763 H263DecContext *const h = avctx->priv_data;
432 5763 MPVContext *const s = &h->c;
433 5763 const uint8_t *buf = avpkt->data;
434 5763 int buf_size = avpkt->size;
435 int ret;
436 5763 int slice_ret = 0;
437 int bak_width, bak_height;
438
439 /* no supplementary picture */
440
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 5763 if (buf_size == 0) {
441 /* special case for last picture */
442
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 109 if ((!h->c.low_delay || h->skipped_last_frame) && h->c.next_pic.ptr) {
443
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 23 if ((ret = av_frame_ref(pict, h->c.next_pic.ptr->f)) < 0)
444 ✗ return ret;
445
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 23 if (h->skipped_last_frame) {
446 /* If the stream ended with an NVOP, we output the last frame
447 * in display order, but with the props from the last input
448 * packet so that the stream's end time is correct. */
449 ✗ ret = ff_decode_frame_props(avctx, pict);
450 ✗ if (ret < 0)
451 ✗ return ret;
452 }
453
454 23 ff_mpv_unref_picture(&h->c.next_pic);
455
456 23 *got_frame = 1;
457 }
458
459 109 return 0;
460 }
461
462 // h->gb might be overridden in ff_mpeg4_decode_picture_header() below.
463 5654 ret = init_get_bits8(&h->gb, buf, buf_size);
464
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 5654 if (ret < 0)
465 ✗ return ret;
466
467 5654 bak_width = h->c.width;
468 5654 bak_height = h->c.height;
469
470 /* let's go :-) */
471 5654 ret = h->decode_header(h);
472
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 5654 if (ret < 0 || ret == FRAME_SKIPPED) {
473 ✗ if ( h->c.width != bak_width
474 ✗ || h->c.height != bak_height) {
475 ✗ av_log(h->c.avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
476 ✗ h->c.width = bak_width;
477 ✗ h->c.height= bak_height;
478
479 }
480 }
481
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 5654 if (ret == FRAME_SKIPPED)
482 ✗ return buf_size;
483
484 /* skip if the header was thrashed */
485
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 5654 if (ret < 0) {
486 ✗ av_log(h->c.avctx, AV_LOG_ERROR, "header damaged\n");
487 ✗ return ret;
488 }
489
490
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 5654 if (!h->c.context_initialized) {
491 193 avctx->pix_fmt = h263_get_format(avctx);
492
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 193 if ((ret = ff_mpv_common_init(s)) < 0)
493 ✗ return ret;
494 }
495
496 5654 avctx->has_b_frames = !h->c.low_delay;
497
498
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 5654 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4) {
499
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 3529 if (h->c.pict_type != AV_PICTURE_TYPE_B && h->c.mb_num/2 > get_bits_left(&h->gb))
500 ✗ return AVERROR_INVALIDDATA;
501 3529 ff_mpeg4_workaround_bugs(avctx);
502
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 3529 if (h->c.studio_profile != (h->c.idsp.idct == NULL))
503 1 ff_mpv_idct_init(s);
504 }
505
506 /* After H.263 & MPEG-4 header decode we have the height, width,
507 * and other parameters. So then we could init the picture. */
508
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 5654 if (h->c.width != avctx->coded_width ||
509
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 5608 h->c.height != avctx->coded_height ||
510
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 5608 h->c.context_reinit) {
511 /* H.263 could change picture size any time */
512 47 h->c.context_reinit = 0;
513
514 47 ret = ff_set_dimensions(avctx, h->c.width, h->c.height);
515
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 47 if (ret < 0)
516 ✗ return ret;
517
518 47 ff_set_sar(avctx, avctx->sample_aspect_ratio);
519
520
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 47 if ((ret = ff_mpv_common_frame_size_change(s)))
521 ✗ return ret;
522
523
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 47 if (avctx->pix_fmt != h263_get_format(avctx)) {
524 ✗ av_log(avctx, AV_LOG_ERROR, "format change not supported\n");
525 ✗ avctx->pix_fmt = AV_PIX_FMT_NONE;
526 ✗ return AVERROR_UNKNOWN;
527 }
528 }
529
530 /* skip B-frames if we don't have reference frames */
531
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 5654 if (!h->c.last_pic.ptr &&
532
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 369 (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.droppable))
533 ✗ return buf_size;
534
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 5654 if ((avctx->skip_frame >= AVDISCARD_NONREF &&
535
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 174 h->c.pict_type == AV_PICTURE_TYPE_B) ||
536
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 5654 (avctx->skip_frame >= AVDISCARD_NONKEY &&
537
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 174 h->c.pict_type != AV_PICTURE_TYPE_I) ||
538
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 5607 avctx->skip_frame >= AVDISCARD_ALL)
539 171 return buf_size;
540
541
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 5483 if ((ret = ff_mpv_frame_start(s, avctx)) < 0)
542 ✗ return ret;
543
544
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 5483 if (!h->divx_packed)
545 5468 ff_thread_finish_setup(avctx);
546
547
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 5483 if (avctx->hwaccel) {
548 ✗ ret = FF_HW_CALL(avctx, start_frame, NULL,
549 h->gb.buffer, h->gb.buffer_end - h->gb.buffer);
550 ✗ if (ret < 0 )
551 ✗ return ret;
552 }
553
554 5483 ff_mpv_er_frame_start_ext(s, h->partitioned_frame,
555 5483 s->pp_time, s->pb_time);
556
557 /* the second part of the wmv2 header contains the MB skip bits which
558 * are stored in current_picture->mb_type which is not available before
559 * ff_mpv_frame_start() */
560 #if CONFIG_WMV2_DECODER
561
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 5483 if (h->c.msmpeg4_version == MSMP4_WMV2) {
562 674 ret = ff_wmv2_decode_secondary_picture_header(h);
563
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 674 if (ret < 0)
564 ✗ return ret;
565
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 674 if (ret == 1)
566 3 goto frame_end;
567 }
568 #endif
569
570 /* decode each macroblock */
571 5480 h->c.mb_x = 0;
572 5480 h->c.mb_y = 0;
573
574 5480 slice_ret = decode_slice(h);
575
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 11960 while (h->c.mb_y < h->c.mb_height) {
576
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 6480 if (h->c.msmpeg4_version != MSMP4_UNUSED) {
577 ✗ if (h->slice_height == 0 || h->c.mb_x != 0 || slice_ret < 0 ||
578 ✗ (h->c.mb_y % h->slice_height) != 0 || get_bits_left(&h->gb) < 0)
579 break;
580 } else {
581 6480 int prev_x = h->c.mb_x, prev_y = h->c.mb_y;
582
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 6480 if (ff_h263_resync(h) < 0)
583 ✗ break;
584
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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)
585 29 h->c.er.error_occurred = 1;
586 }
587
588
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 6480 if (h->c.msmpeg4_version < MSMP4_WMV1 && h->c.h263_pred)
589 3936 ff_mpeg4_clean_buffers(s);
590
591
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 6480 if (decode_slice(h) < 0)
592 ✗ slice_ret = AVERROR_INVALIDDATA;
593 }
594
595
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 5480 if (h->c.msmpeg4_version != MSMP4_UNUSED && h->c.msmpeg4_version < MSMP4_WMV1 &&
596
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 475 h->c.pict_type == AV_PICTURE_TYPE_I)
597
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 44 if (!CONFIG_MSMPEG4DEC ||
598 44 ff_msmpeg4_decode_ext_header(h, buf_size) < 0)
599 ✗ h->c.er.error_status_table[h->c.mb_num - 1] = ER_MB_ERROR;
600
601 5480 frame_end:
602
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 5483 if (!h->c.studio_profile)
603 5482 ff_er_frame_end(&h->c.er, NULL);
604
605
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 5483 if (avctx->hwaccel) {
606 ✗ ret = FF_HW_SIMPLE_CALL(avctx, end_frame);
607 ✗ if (ret < 0)
608 ✗ return ret;
609 }
610
611 5483 ff_mpv_frame_end(s);
612
613
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 5483 if (CONFIG_MPEG4_DECODER && avctx->codec_id == AV_CODEC_ID_MPEG4)
614 3381 ff_mpeg4_frame_end(avctx, avpkt);
615
616 av_assert1(h->c.pict_type == h->c.cur_pic.ptr->f->pict_type);
617
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 5483 if (h->c.pict_type == AV_PICTURE_TYPE_B || h->c.low_delay) {
618
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 5030 if ((ret = av_frame_ref(pict, h->c.cur_pic.ptr->f)) < 0)
619 ✗ return ret;
620 5030 ff_print_debug_info(s, h->c.cur_pic.ptr, pict);
621 5030 ff_mpv_export_qp_table(s, pict, h->c.cur_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
622
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 453 } else if (h->c.last_pic.ptr) {
623
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 427 if ((ret = av_frame_ref(pict, h->c.last_pic.ptr->f)) < 0)
624 ✗ return ret;
625 427 ff_print_debug_info(s, h->c.last_pic.ptr, pict);
626 427 ff_mpv_export_qp_table(s, pict, h->c.last_pic.ptr, FF_MPV_QSCALE_TYPE_MPEG1);
627 }
628
629
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 5483 if (h->c.last_pic.ptr || h->c.low_delay) {
630
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 5457 if ( pict->format == AV_PIX_FMT_YUV420P
631
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 5456 && (h->c.codec_tag == AV_RL32("GEOV") || h->c.codec_tag == AV_RL32("GEOX"))) {
632 ✗ for (int p = 0; p < 3; p++) {
633 ✗ int h = AV_CEIL_RSHIFT(pict->height, !!p);
634
635 ✗ pict->data[p] += (h - 1) * pict->linesize[p];
636 ✗ pict->linesize[p] *= -1;
637 }
638 }
639 5457 *got_frame = 1;
640 }
641
642
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 5483 if (slice_ret < 0 && (avctx->err_recognition & AV_EF_EXPLODE))
643 ✗ return slice_ret;
644 else
645 5483 return buf_size;
646 }
647
648 static const AVCodecHWConfigInternal *const h263_hw_config_list[] = {
649 #if CONFIG_H263_VAAPI_HWACCEL
650 HWACCEL_VAAPI(h263),
651 #endif
652 #if CONFIG_MPEG4_NVDEC_HWACCEL
653 HWACCEL_NVDEC(mpeg4),
654 #endif
655 #if CONFIG_MPEG4_VDPAU_HWACCEL
656 HWACCEL_VDPAU(mpeg4),
657 #endif
658 #if CONFIG_H263_VIDEOTOOLBOX_HWACCEL
659 HWACCEL_VIDEOTOOLBOX(h263),
660 #endif
661 NULL
662 };
663
664 const FFCodec ff_h263_decoder = {
665 .p.name = "h263",
666 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
667 .p.type = AVMEDIA_TYPE_VIDEO,
668 .p.id = AV_CODEC_ID_H263,
669 .priv_data_size = sizeof(H263DecContext),
670 .init = ff_h263_decode_init,
671 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
672 .close = ff_mpv_decode_close,
673 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
674 AV_CODEC_CAP_DELAY,
675 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
676 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
677 .flush = ff_mpeg_flush,
678 .p.max_lowres = 3,
679 .hw_configs = h263_hw_config_list,
680 };
681
682 const FFCodec ff_h263p_decoder = {
683 .p.name = "h263p",
684 CODEC_LONG_NAME("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
685 .p.type = AVMEDIA_TYPE_VIDEO,
686 .p.id = AV_CODEC_ID_H263P,
687 .priv_data_size = sizeof(H263DecContext),
688 .init = ff_h263_decode_init,
689 FF_CODEC_DECODE_CB(ff_h263_decode_frame),
690 .close = ff_mpv_decode_close,
691 .p.capabilities = AV_CODEC_CAP_DRAW_HORIZ_BAND | AV_CODEC_CAP_DR1 |
692 AV_CODEC_CAP_DELAY,
693 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP |
694 FF_CODEC_CAP_SKIP_FRAME_FILL_PARAM,
695 .flush = ff_mpeg_flush,
696 .p.max_lowres = 3,
697 .hw_configs = h263_hw_config_list,
698 };
699