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libavcodec/mpeg12dec.c: support DVB CC format 0x0502 in user_data
[FFMpeg-mirror.git] / tools / target_dec_fuzzer.c
blob432e94881688a2828c48678b1afdb3509977aeed
1 /*
2 * This file is part of FFmpeg.
3 *
4 * FFmpeg is free software; you can redistribute it and/or
5 * modify it under the terms of the GNU Lesser General Public
6 * License as published by the Free Software Foundation; either
7 * version 2.1 of the License, or (at your option) any later version.
8 *
9 * FFmpeg is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12 * Lesser General Public License for more details.
13 *
14 * You should have received a copy of the GNU Lesser General Public
15 * License along with FFmpeg; if not, write to the Free Software
16 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
17 */
18
19 /* Targeted fuzzer that targets specific codecs depending on two
20 compile-time flags.
21 INSTRUCTIONS:
22
23 * Get the very fresh clang, e.g. see http://libfuzzer.info#versions
24 * Get and build libFuzzer:
25 svn co http://llvm.org/svn/llvm-project/llvm/trunk/lib/Fuzzer
26 ./Fuzzer/build.sh
27 * build ffmpeg for fuzzing:
28 FLAGS="-fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp -g" CC="clang $FLAGS" CXX="clang++ $FLAGS" ./configure --disable-x86asm
29 make clean && make -j
30 * build the fuzz target.
31 Choose the value of FFMPEG_CODEC (e.g. AV_CODEC_ID_DVD_SUBTITLE) and
32 choose one of FUZZ_FFMPEG_VIDEO, FUZZ_FFMPEG_AUDIO, FUZZ_FFMPEG_SUBTITLE.
33 clang -fsanitize=address -fsanitize-coverage=trace-pc-guard,trace-cmp tools/target_dec_fuzzer.c -o target_dec_fuzzer -I. -DFFMPEG_CODEC=AV_CODEC_ID_MPEG1VIDEO -DFUZZ_FFMPEG_VIDEO ../../libfuzzer/libFuzzer.a -Llibavcodec -Llibavdevice -Llibavfilter -Llibavformat -Llibavutil -Llibpostproc -Llibswscale -Llibswresample -Wl,--as-needed -Wl,-z,noexecstack -Wl,--warn-common -Wl,-rpath-link=:libpostproc:libswresample:libswscale:libavfilter:libavdevice:libavformat:libavcodec:libavutil -lavdevice -lavfilter -lavformat -lavcodec -lswresample -lswscale -lavutil -ldl -lxcb -lxcb-shm -lxcb -lxcb-xfixes -lxcb -lxcb-shape -lxcb -lX11 -lasound -lm -lbz2 -lz -pthread
34 * create a corpus directory and put some samples there (empty dir is ok too):
35 mkdir CORPUS && cp some-files CORPUS
36
37 * Run fuzzing:
38 ./target_dec_fuzzer -max_len=100000 CORPUS
39
40 More info:
41 http://libfuzzer.info
42 http://tutorial.libfuzzer.info
43 https://github.com/google/oss-fuzz
44 http://lcamtuf.coredump.cx/afl/
45 https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html
46 */
47
48 #include "config.h"
49 #include "libavutil/avassert.h"
50 #include "libavutil/avstring.h"
51 #include "libavutil/cpu.h"
52 #include "libavutil/imgutils.h"
53 #include "libavutil/intreadwrite.h"
54 #include "libavutil/mem.h"
55
56 #include "libavcodec/avcodec.h"
57 #include "libavcodec/bytestream.h"
58 #include "libavcodec/codec_internal.h"
59 #include "libavformat/avformat.h"
60
61 //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected
62 #include "libavcodec/internal.h"
63
64 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
65
66 extern const FFCodec * codec_list[];
67
68 static void error(const char *err)
69 {
70 fprintf(stderr, "%s", err);
71 exit(1);
72 }
73
74 static const FFCodec *c = NULL;
75 static const FFCodec *AVCodecInitialize(enum AVCodecID codec_id)
76 {
77 const AVCodec *res;
78
79 res = avcodec_find_decoder(codec_id);
80 if (!res)
81 error("Failed to find decoder");
82 return ffcodec(res);
83 }
84
85 static int subtitle_handler(AVCodecContext *avctx, AVFrame *unused,
86 int *got_sub_ptr, const AVPacket *avpkt)
87 {
88 AVSubtitle sub;
89 int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
90 if (ret >= 0 && *got_sub_ptr)
91 avsubtitle_free(&sub);
92 return ret;
93 }
94
95 static int audio_video_handler(AVCodecContext *avctx, AVFrame *frame,
96 int *got_frame, const AVPacket *dummy)
97 {
98 int ret = avcodec_receive_frame(avctx, frame);
99 *got_frame = ret >= 0;
100 return ret;
101 }
102
103 // Ensure we don't loop forever
104 const uint32_t maxiteration = 8096;
105
106 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
107
108 static int fuzz_video_get_buffer(AVCodecContext *ctx, AVFrame *frame)
109 {
110 ptrdiff_t linesize1[4];
111 size_t size[4];
112 int linesize_align[AV_NUM_DATA_POINTERS];
113 int i, ret, w = frame->width, h = frame->height;
114
115 avcodec_align_dimensions2(ctx, &w, &h, linesize_align);
116 ret = av_image_fill_linesizes(frame->linesize, ctx->pix_fmt, w);
117 if (ret < 0)
118 return ret;
119
120 for (i = 0; i < 4 && frame->linesize[i]; i++)
121 linesize1[i] = frame->linesize[i] =
122 FFALIGN(frame->linesize[i], linesize_align[i]);
123 for (; i < 4; i++)
124 linesize1[i] = 0;
125
126 ret = av_image_fill_plane_sizes(size, ctx->pix_fmt, h, linesize1);
127 if (ret < 0)
128 return ret;
129
130 frame->extended_data = frame->data;
131 for (i = 0; i < 4 && size[i]; i++) {
132 switch(ctx->codec_id) {
133 case AV_CODEC_ID_FFV1:
134 frame->buf[i] = av_buffer_alloc(size[i]);
135 break;
136 default:
137 frame->buf[i] = av_buffer_allocz(size[i]);
138 }
139
140 if (!frame->buf[i])
141 goto fail;
142 frame->data[i] = frame->buf[i]->data;
143 }
144 for (; i < AV_NUM_DATA_POINTERS; i++) {
145 frame->data[i] = NULL;
146 frame->linesize[i] = 0;
147 }
148
149 return 0;
150 fail:
151 av_frame_unref(frame);
152 return AVERROR(ENOMEM);
153 }
154
155 static int fuzz_get_buffer2(AVCodecContext *ctx, AVFrame *frame, int flags)
156 {
157 switch (ctx->codec_type) {
158 case AVMEDIA_TYPE_VIDEO:
159 return (ctx->codec->capabilities & AV_CODEC_CAP_DR1)
160 ? fuzz_video_get_buffer(ctx, frame)
161 : avcodec_default_get_buffer2(ctx, frame, flags);
162 case AVMEDIA_TYPE_AUDIO:
163 return avcodec_default_get_buffer2(ctx, frame, flags);
164 default:
165 return AVERROR(EINVAL);
166 }
167 }
168
169 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
170 uint64_t maxpixels_per_frame = 4096 * 4096;
171 uint64_t maxpixels;
172
173 uint64_t maxsamples_per_frame = 256*1024*32;
174 uint64_t maxsamples;
175 const uint64_t fuzz_tag = FUZZ_TAG;
176 const uint8_t *last = data;
177 const uint8_t *end = data + size;
178 uint32_t it = 0;
179 uint64_t ec_pixels = 0;
180 uint64_t nb_samples = 0;
181 int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
182 int *got_picture_ptr,
183 const AVPacket *avpkt) = NULL;
184 AVCodecParserContext *parser = NULL;
185 uint64_t keyframes = 0;
186 uint64_t flushpattern = -1;
187 AVDictionary *opts = NULL;
188
189 if (!c) {
190 #ifdef FFMPEG_DECODER
191 #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
192 #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
193 extern FFCodec DECODER_SYMBOL(FFMPEG_DECODER);
194 codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER);
195
196 #if FFMPEG_DECODER == tiff || FFMPEG_DECODER == tdsc
197 extern FFCodec DECODER_SYMBOL(mjpeg);
198 codec_list[1] = &DECODER_SYMBOL(mjpeg);
199 #endif
200
201 c = &DECODER_SYMBOL(FFMPEG_DECODER);
202 #else
203 c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
204 #endif
205 av_log_set_level(AV_LOG_PANIC);
206 }
207
208 switch (c->p.type) {
209 case AVMEDIA_TYPE_AUDIO :
210 case AVMEDIA_TYPE_VIDEO : decode_handler = audio_video_handler ; break;
211 case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
212 }
213 switch (c->p.id) {
214 case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break;
215 }
216 maxpixels = maxpixels_per_frame * maxiteration;
217 maxsamples = maxsamples_per_frame * maxiteration;
218 switch (c->p.id) {
219 case AV_CODEC_ID_AASC: maxpixels /= 1024; break;
220 case AV_CODEC_ID_AGM: maxpixels /= 1024; break;
221 case AV_CODEC_ID_ANM: maxpixels /= 1024; break;
222 case AV_CODEC_ID_APE: maxsamples /= 16384; break;
223 case AV_CODEC_ID_ARBC: maxpixels /= 1024; break;
224 case AV_CODEC_ID_ARGO: maxpixels /= 1024; break;
225 case AV_CODEC_ID_BETHSOFTVID: maxpixels /= 8192; break;
226 case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break;
227 case AV_CODEC_ID_BONK: maxsamples /= 1<<20; break;
228 case AV_CODEC_ID_CDTOONS: maxpixels /= 1024; break;
229 case AV_CODEC_ID_CFHD: maxpixels /= 16384; break;
230 case AV_CODEC_ID_CINEPAK: maxpixels /= 128; break;
231 case AV_CODEC_ID_COOK: maxsamples /= 1<<20; break;
232 case AV_CODEC_ID_CSCD: maxpixels /= 1024; break;
233 case AV_CODEC_ID_DFA: maxpixels /= 1024; break;
234 case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break;
235 case AV_CODEC_ID_DSICINVIDEO: maxpixels /= 1024; break;
236 case AV_CODEC_ID_DST: maxsamples /= 1<<20; break;
237 case AV_CODEC_ID_DVB_SUBTITLE: av_dict_set_int(&opts, "compute_clut", -2, 0); break;
238 case AV_CODEC_ID_DXA: maxpixels /= 32; break;
239 case AV_CODEC_ID_DXV: maxpixels /= 32; break;
240 case AV_CODEC_ID_EXR: maxpixels /= 1024; break;
241 case AV_CODEC_ID_FFV1: maxpixels /= 32; break;
242 case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break;
243 case AV_CODEC_ID_FLAC: maxsamples /= 1024; break;
244 case AV_CODEC_ID_FLIC: maxpixels /= 1024; break;
245 case AV_CODEC_ID_FLV1: maxpixels /= 1024; break;
246 case AV_CODEC_ID_FMVC: maxpixels /= 1024; break;
247 case AV_CODEC_ID_G2M: maxpixels /= 1024; break;
248 case AV_CODEC_ID_GEM: maxpixels /= 512; break;
249 case AV_CODEC_ID_GDV: maxpixels /= 512; break;
250 case AV_CODEC_ID_GIF: maxpixels /= 16; break;
251 case AV_CODEC_ID_H264: maxpixels /= 256; break;
252 case AV_CODEC_ID_HAP: maxpixels /= 128; break;
253 case AV_CODEC_ID_HEVC: maxpixels /= 16384; break;
254 case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break;
255 case AV_CODEC_ID_HQ_HQA: maxpixels /= 128; break;
256 case AV_CODEC_ID_IFF_ILBM: maxpixels /= 4096; break;
257 case AV_CODEC_ID_INDEO4: maxpixels /= 128; break;
258 case AV_CODEC_ID_INTERPLAY_ACM: maxsamples /= 16384; break;
259 case AV_CODEC_ID_JPEG2000: maxpixels /= 16384; break;
260 case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break;
261 case AV_CODEC_ID_LOCO: maxpixels /= 1024; break;
262 case AV_CODEC_ID_VORBIS: maxsamples /= 1024; break;
263 case AV_CODEC_ID_LSCR: maxpixels /= 16; break;
264 case AV_CODEC_ID_MMVIDEO: maxpixels /= 256; break;
265 case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break;
266 case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break;
267 case AV_CODEC_ID_MSA1: maxpixels /= 16384; break;
268 case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
269 case AV_CODEC_ID_MSS2: maxpixels /= 16384; break;
270 case AV_CODEC_ID_MSZH: maxpixels /= 128; break;
271 case AV_CODEC_ID_MTS2: maxpixels /= 4096; break;
272 case AV_CODEC_ID_MV30: maxpixels /= 128; break;
273 case AV_CODEC_ID_MVC2: maxpixels /= 128; break;
274 case AV_CODEC_ID_MVHA: maxpixels /= 16384; break;
275 case AV_CODEC_ID_MVDV: maxpixels /= 1024; break;
276 case AV_CODEC_ID_MWSC: maxpixels /= 256; break;
277 case AV_CODEC_ID_MXPEG: maxpixels /= 128; break;
278 case AV_CODEC_ID_NUV: maxpixels /= 128; break;
279 case AV_CODEC_ID_OPUS: maxsamples /= 16384; break;
280 case AV_CODEC_ID_PNG: maxpixels /= 128; break;
281 case AV_CODEC_ID_APNG: maxpixels /= 128; break;
282 case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
283 case AV_CODEC_ID_PAF_VIDEO: maxpixels /= 16; break;
284 case AV_CODEC_ID_PRORES: maxpixels /= 256; break;
285 case AV_CODEC_ID_QPEG: maxpixels /= 256; break;
286 case AV_CODEC_ID_RKA: maxsamples /= 1<<20; break;
287 case AV_CODEC_ID_RSCC: maxpixels /= 256; break;
288 case AV_CODEC_ID_RASC: maxpixels /= 256; break;
289 case AV_CODEC_ID_RTV1: maxpixels /= 16; break;
290 case AV_CODEC_ID_RV30: maxpixels /= 256; break;
291 case AV_CODEC_ID_SANM: maxpixels /= 16; break;
292 case AV_CODEC_ID_SCPR: maxpixels /= 32; break;
293 case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break;
294 case AV_CODEC_ID_SIMBIOSIS_IMX:maxpixels /= 16384; break;
295 case AV_CODEC_ID_SPEEX: maxsamples /= 128; break;
296 case AV_CODEC_ID_SMACKAUDIO: maxsamples /= 4096; break;
297 case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break;
298 case AV_CODEC_ID_SNOW: maxpixels /= 128; break;
299 case AV_CODEC_ID_SRGC: maxpixels /= 128; break;
300 case AV_CODEC_ID_TARGA: maxpixels /= 128; break;
301 case AV_CODEC_ID_TAK: maxsamples /= 1024; break;
302 case AV_CODEC_ID_TGV: maxpixels /= 32; break;
303 case AV_CODEC_ID_THEORA: maxpixels /= 16384; break;
304 case AV_CODEC_ID_TQI: maxpixels /= 1024; break;
305 case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break;
306 case AV_CODEC_ID_TSCC: maxpixels /= 1024; break;
307 case AV_CODEC_ID_UTVIDEO: maxpixels /= 1024; break;
308 case AV_CODEC_ID_VB: maxpixels /= 1024; break;
309 case AV_CODEC_ID_VC1: maxpixels /= 8192; break;
310 case AV_CODEC_ID_VC1IMAGE: maxpixels /= 8192; break;
311 case AV_CODEC_ID_VMNC: maxpixels /= 8192; break;
312 case AV_CODEC_ID_VMDVIDEO: maxpixels /= 1024; break;
313 case AV_CODEC_ID_VMIX: maxpixels /= 8192; break;
314 case AV_CODEC_ID_VP3: maxpixels /= 4096; break;
315 case AV_CODEC_ID_VP4: maxpixels /= 4096; break;
316 case AV_CODEC_ID_VP5: maxpixels /= 256; break;
317 case AV_CODEC_ID_VP6F: maxpixels /= 4096; break;
318 case AV_CODEC_ID_VP6A: maxpixels /= 4096; break;
319 case AV_CODEC_ID_VP7: maxpixels /= 256; break;
320 case AV_CODEC_ID_VP9: maxpixels /= 4096; break;
321 case AV_CODEC_ID_WAVPACK: maxsamples /= 1024; break;
322 case AV_CODEC_ID_WCMV: maxpixels /= 1024; break;
323 case AV_CODEC_ID_WMV3IMAGE: maxpixels /= 8192; break;
324 case AV_CODEC_ID_WMV2: maxpixels /= 1024; break;
325 case AV_CODEC_ID_WMV3: maxpixels /= 1024; break;
326 case AV_CODEC_ID_WS_VQA: maxpixels /= 16384; break;
327 case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024; break;
328 case AV_CODEC_ID_WMAPRO: maxsamples /= 16384; break;
329 case AV_CODEC_ID_YLC: maxpixels /= 1024; break;
330 case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break;
331 case AV_CODEC_ID_ZLIB: maxpixels /= 4096; break;
332 }
333
334 maxsamples_per_frame = FFMIN(maxsamples_per_frame, maxsamples);
335 maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels);
336
337 AVCodecContext* ctx = avcodec_alloc_context3(&c->p);
338 AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL);
339 if (!ctx || !parser_avctx)
340 error("Failed memory allocation");
341
342 if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
343 ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
344
345 ctx->max_samples = maxsamples_per_frame;
346 ctx->get_buffer2 = fuzz_get_buffer2;
347 if (c->p.capabilities & AV_CODEC_CAP_EXPERIMENTAL)
348 ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
349
350 if (size > 1024) {
351 GetByteContext gbc;
352 int extradata_size;
353 int flags;
354 uint64_t request_channel_layout;
355 int64_t flags64;
356
357 size -= 1024;
358 bytestream2_init(&gbc, data + size, 1024);
359 ctx->width = bytestream2_get_le32(&gbc);
360 ctx->height = bytestream2_get_le32(&gbc);
361 ctx->bit_rate = bytestream2_get_le64(&gbc);
362 ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
363 // Try to initialize a parser for this codec, note, this may fail which just means we test without one
364 flags = bytestream2_get_byte(&gbc);
365 if (flags & 1)
366 parser = av_parser_init(c->p.id);
367 if (flags & 2)
368 ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
369 if (flags & 4) {
370 ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL;
371 if (flags & 8)
372 ctx->err_recognition |= AV_EF_EXPLODE;
373 }
374 if ((flags & 0x10) && c->p.id != AV_CODEC_ID_H264)
375 ctx->flags2 |= AV_CODEC_FLAG2_FAST;
376 if (flags & 0x80)
377 ctx->export_side_data |= AV_CODEC_EXPORT_DATA_MVS;
378
379 if (flags & 0x40)
380 av_force_cpu_flags(0);
381
382 extradata_size = bytestream2_get_le32(&gbc);
383
384 ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
385 ctx->ch_layout.nb_channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
386 ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
387 ctx->codec_tag = bytestream2_get_le32(&gbc);
388 if (c->codec_tags) {
389 int n;
390 for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++);
391 ctx->codec_tag = c->codec_tags[ctx->codec_tag % n];
392 }
393 keyframes = bytestream2_get_le64(&gbc);
394 request_channel_layout = bytestream2_get_le64(&gbc);
395
396 ctx->idct_algo = bytestream2_get_byte(&gbc) % 25;
397 flushpattern = bytestream2_get_le64(&gbc);
398 ctx->skip_frame = bytestream2_get_byte(&gbc) - 254 + AVDISCARD_ALL;
399
400
401 if (flags & 0x20) {
402 switch (ctx->codec_id) {
403 case AV_CODEC_ID_AC3:
404 case AV_CODEC_ID_EAC3:
405 av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0);
406 av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0);
407 av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0);
408 av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0);
409 break;
410 }
411 }
412
413 // Keep the deprecated request_channel_layout behavior to ensure old fuzzing failures
414 // remain reproducible.
415 if (request_channel_layout) {
416 switch (ctx->codec_id) {
417 case AV_CODEC_ID_AC3:
418 case AV_CODEC_ID_EAC3:
419 case AV_CODEC_ID_MLP:
420 case AV_CODEC_ID_TRUEHD:
421 case AV_CODEC_ID_DTS:
422 if (request_channel_layout & ~INT64_MIN) {
423 char *downmix_layout = av_mallocz(19);
424 if (!downmix_layout)
425 error("Failed memory allocation");
426 av_strlcatf(downmix_layout, 19, "0x%"PRIx64, request_channel_layout & ~INT64_MIN);
427 av_dict_set(&opts, "downmix", downmix_layout, AV_DICT_DONT_STRDUP_VAL);
428 }
429 if (ctx->codec_id != AV_CODEC_ID_DTS)
430 break;
431 // fall-through
432 case AV_CODEC_ID_DOLBY_E:
433 av_dict_set_int(&opts, "channel_order", !!(request_channel_layout & INT64_MIN), 0);
434 break;
435 }
436 }
437
438 flags64 = bytestream2_get_le64(&gbc);
439 if (flags64 &1)
440 ctx->debug |= FF_DEBUG_SKIP;
441 if (flags64 &2)
442 ctx->debug |= FF_DEBUG_QP;
443 if (flags64 &4)
444 ctx->debug |= FF_DEBUG_MB_TYPE;
445 if (flags64 & 8)
446 ctx->export_side_data |= AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS;
447 if (flags64 & 0x10)
448 ctx->err_recognition |= AV_EF_CRCCHECK;
449
450 ctx->workaround_bugs = bytestream2_get_le32(&gbc);
451
452 if (c->p.max_lowres) {
453 ctx->lowres = bytestream2_get_byte(&gbc) % (c->p.max_lowres+1);
454 }
455
456 if (extradata_size < size) {
457 ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
458 if (ctx->extradata) {
459 ctx->extradata_size = extradata_size;
460 size -= ctx->extradata_size;
461 memcpy(ctx->extradata, data + size, ctx->extradata_size);
462 }
463 }
464 if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
465 ctx->width = ctx->height = 0;
466 }
467
468 int res = avcodec_open2(ctx, &c->p, &opts);
469 if (res < 0) {
470 avcodec_free_context(&ctx);
471 av_free(parser_avctx);
472 av_parser_close(parser);
473 av_dict_free(&opts);
474 return 0; // Failure of avcodec_open2() does not imply that a issue was found
475 }
476 parser_avctx->codec_id = ctx->codec_id;
477 parser_avctx->extradata_size = ctx->extradata_size;
478 parser_avctx->extradata = ctx->extradata ? av_memdup(ctx->extradata, ctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE) : NULL;
479
480
481 int got_frame;
482 AVFrame *frame = av_frame_alloc();
483 AVPacket *avpkt = av_packet_alloc();
484 AVPacket *parsepkt = av_packet_alloc();
485 if (!frame || !avpkt || !parsepkt)
486 error("Failed memory allocation");
487
488 // Read very simple container
489 while (data < end && it < maxiteration) {
490 // Search for the TAG
491 while (data + sizeof(fuzz_tag) < end) {
492 if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
493 break;
494 data++;
495 }
496 if (data + sizeof(fuzz_tag) > end)
497 data = end;
498
499 res = av_new_packet(parsepkt, data - last);
500 if (res < 0)
501 error("Failed memory allocation");
502 memcpy(parsepkt->data, last, data - last);
503 parsepkt->flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
504 keyframes = (keyframes >> 2) + (keyframes<<62);
505 data += sizeof(fuzz_tag);
506 last = data;
507
508 while (parsepkt->size > 0) {
509 int decode_more;
510
511 if (parser) {
512 int ret = av_parser_parse2(parser, parser_avctx, &avpkt->data, &avpkt->size,
513 parsepkt->data, parsepkt->size,
514 parsepkt->pts, parsepkt->dts, parsepkt->pos);
515 if (avpkt->data == parsepkt->data) {
516 avpkt->buf = av_buffer_ref(parsepkt->buf);
517 if (!avpkt->buf)
518 error("Failed memory allocation");
519 } else {
520 if (av_packet_make_refcounted(avpkt) < 0)
521 error("Failed memory allocation");
522 }
523 parsepkt->data += ret;
524 parsepkt->size -= ret;
525 parsepkt->pos += ret;
526 avpkt->pts = parser->pts;
527 avpkt->dts = parser->dts;
528 avpkt->pos = parser->pos;
529 if ( parser->key_frame == 1 ||
530 (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I))
531 avpkt->flags |= AV_PKT_FLAG_KEY;
532 avpkt->flags |= parsepkt->flags & AV_PKT_FLAG_DISCARD;
533 } else {
534 av_packet_move_ref(avpkt, parsepkt);
535 }
536
537 if (!(flushpattern & 7))
538 avcodec_flush_buffers(ctx);
539 flushpattern = (flushpattern >> 3) + (flushpattern << 61);
540
541 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
542 int ret = avcodec_send_packet(ctx, avpkt);
543 decode_more = ret >= 0;
544 if(!decode_more) {
545 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
546 if (it > 20 || ec_pixels > 4 * ctx->max_pixels) {
547 ctx->error_concealment = 0;
548 ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE);
549 }
550 if (ec_pixels > maxpixels)
551 goto maximums_reached;
552 }
553 } else
554 decode_more = 1;
555
556 // Iterate through all data
557 while (decode_more && it++ < maxiteration) {
558 av_frame_unref(frame);
559 int ret = decode_handler(ctx, frame, &got_frame, avpkt);
560
561 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
562 if (it > 20 || ec_pixels > 4 * ctx->max_pixels) {
563 ctx->error_concealment = 0;
564 ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE);
565 }
566 if (ec_pixels > maxpixels)
567 goto maximums_reached;
568
569 if (ctx->codec_type == AVMEDIA_TYPE_AUDIO &&
570 frame->nb_samples == 0 && !got_frame &&
571 (avpkt->flags & AV_PKT_FLAG_DISCARD))
572 nb_samples += ctx->max_samples;
573
574 nb_samples += frame->nb_samples;
575 if (nb_samples > maxsamples)
576 goto maximums_reached;
577
578 if (ret <= 0 || ret > avpkt->size)
579 break;
580
581 if (ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
582 avpkt->data += ret;
583 avpkt->size -= ret;
584 decode_more = avpkt->size > 0;
585 } else
586 decode_more = ret >= 0;
587 }
588 av_packet_unref(avpkt);
589 }
590 av_packet_unref(parsepkt);
591 }
592 maximums_reached:
593
594 av_packet_unref(avpkt);
595
596 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE)
597 avcodec_send_packet(ctx, NULL);
598
599 do {
600 got_frame = 0;
601 av_frame_unref(frame);
602 decode_handler(ctx, frame, &got_frame, avpkt);
603
604 nb_samples += frame->nb_samples;
605 if (nb_samples > maxsamples)
606 break;
607 } while (got_frame == 1 && it++ < maxiteration);
608
609 fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it);
610
611 av_frame_free(&frame);
612 avcodec_free_context(&ctx);
613 avcodec_free_context(&parser_avctx);
614 av_parser_close(parser);
615 av_packet_free(&avpkt);
616 av_packet_free(&parsepkt);
617 av_dict_free(&opts);
618 return 0;
619 }
Mirror of the official FFMpeg Git repo