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
55 #include "libavcodec/avcodec.h"
56 #include "libavcodec/bytestream.h"
57 #include "libavcodec/codec_internal.h"
58 #include "libavformat/avformat.h"
59
60 //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected
61 #include "libavcodec/internal.h"
62
63 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
64
65 extern const FFCodec * codec_list[];
66
error(const char *err)67 static void error(const char *err)
68 {
69 fprintf(stderr, "%s", err);
70 exit(1);
71 }
72
73 static const FFCodec *c = NULL;
AVCodecInitialize(enum AVCodecID codec_id)74 static const FFCodec *AVCodecInitialize(enum AVCodecID codec_id)
75 {
76 const AVCodec *res;
77
78 res = avcodec_find_decoder(codec_id);
79 if (!res)
80 error("Failed to find decoder");
81 return ffcodec(res);
82 }
83
subtitle_handler(AVCodecContext *avctx, void *frame, int *got_sub_ptr, AVPacket *avpkt)84 static int subtitle_handler(AVCodecContext *avctx, void *frame,
85 int *got_sub_ptr, AVPacket *avpkt)
86 {
87 AVSubtitle sub;
88 int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt);
89 if (ret >= 0 && *got_sub_ptr)
90 avsubtitle_free(&sub);
91 return ret;
92 }
93
audio_video_handler(AVCodecContext *avctx, AVFrame *frame, int *got_frame, const AVPacket *dummy)94 static int audio_video_handler(AVCodecContext *avctx, AVFrame *frame,
95 int *got_frame, const AVPacket *dummy)
96 {
97 int ret = avcodec_receive_frame(avctx, frame);
98 *got_frame = ret >= 0;
99 return ret;
100 }
101
102 // Ensure we don't loop forever
103 const uint32_t maxiteration = 8096;
104
105 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
106
fuzz_video_get_buffer(AVCodecContext *ctx, AVFrame *frame)107 static int fuzz_video_get_buffer(AVCodecContext *ctx, AVFrame *frame)
108 {
109 ptrdiff_t linesize1[4];
110 size_t size[4];
111 int linesize_align[AV_NUM_DATA_POINTERS];
112 int i, ret, w = frame->width, h = frame->height;
113
114 avcodec_align_dimensions2(ctx, &w, &h, linesize_align);
115 ret = av_image_fill_linesizes(frame->linesize, ctx->pix_fmt, w);
116 if (ret < 0)
117 return ret;
118
119 for (i = 0; i < 4 && frame->linesize[i]; i++)
120 linesize1[i] = frame->linesize[i] =
121 FFALIGN(frame->linesize[i], linesize_align[i]);
122 for (; i < 4; i++)
123 linesize1[i] = 0;
124
125 ret = av_image_fill_plane_sizes(size, ctx->pix_fmt, h, linesize1);
126 if (ret < 0)
127 return ret;
128
129 frame->extended_data = frame->data;
130 for (i = 0; i < 4 && size[i]; i++) {
131 frame->buf[i] = av_buffer_alloc(size[i]);
132 if (!frame->buf[i])
133 goto fail;
134 frame->data[i] = frame->buf[i]->data;
135 }
136 for (; i < AV_NUM_DATA_POINTERS; i++) {
137 frame->data[i] = NULL;
138 frame->linesize[i] = 0;
139 }
140
141 return 0;
142 fail:
143 av_frame_unref(frame);
144 return AVERROR(ENOMEM);
145 }
146
fuzz_get_buffer2(AVCodecContext *ctx, AVFrame *frame, int flags)147 static int fuzz_get_buffer2(AVCodecContext *ctx, AVFrame *frame, int flags)
148 {
149 switch (ctx->codec_type) {
150 case AVMEDIA_TYPE_VIDEO:
151 return (ctx->codec->capabilities & AV_CODEC_CAP_DR1)
152 ? fuzz_video_get_buffer(ctx, frame)
153 : avcodec_default_get_buffer2(ctx, frame, flags);
154 case AVMEDIA_TYPE_AUDIO:
155 return avcodec_default_get_buffer2(ctx, frame, flags);
156 default:
157 return AVERROR(EINVAL);
158 }
159 }
160
LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)161 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
162 uint64_t maxpixels_per_frame = 4096 * 4096;
163 uint64_t maxpixels;
164
165 uint64_t maxsamples_per_frame = 256*1024*32;
166 uint64_t maxsamples;
167 const uint64_t fuzz_tag = FUZZ_TAG;
168 const uint8_t *last = data;
169 const uint8_t *end = data + size;
170 uint32_t it = 0;
171 uint64_t ec_pixels = 0;
172 uint64_t nb_samples = 0;
173 int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture,
174 int *got_picture_ptr,
175 const AVPacket *avpkt) = NULL;
176 AVCodecParserContext *parser = NULL;
177 uint64_t keyframes = 0;
178 uint64_t flushpattern = -1;
179 AVDictionary *opts = NULL;
180
181 if (!c) {
182 #ifdef FFMPEG_DECODER
183 #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder
184 #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC)
185 extern FFCodec DECODER_SYMBOL(FFMPEG_DECODER);
186 codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER);
187
188 #if FFMPEG_DECODER == tiff || FFMPEG_DECODER == tdsc
189 extern FFCodec DECODER_SYMBOL(mjpeg);
190 codec_list[1] = &DECODER_SYMBOL(mjpeg);
191 #endif
192
193 c = &DECODER_SYMBOL(FFMPEG_DECODER);
194 #else
195 c = AVCodecInitialize(FFMPEG_CODEC); // Done once.
196 #endif
197 av_log_set_level(AV_LOG_PANIC);
198 }
199
200 switch (c->p.type) {
201 case AVMEDIA_TYPE_AUDIO :
202 case AVMEDIA_TYPE_VIDEO : decode_handler = audio_video_handler ; break;
203 case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break;
204 }
205 switch (c->p.id) {
206 case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break;
207 }
208 maxpixels = maxpixels_per_frame * maxiteration;
209 maxsamples = maxsamples_per_frame * maxiteration;
210 switch (c->p.id) {
211 case AV_CODEC_ID_AASC: maxpixels /= 1024; break;
212 case AV_CODEC_ID_AGM: maxpixels /= 1024; break;
213 case AV_CODEC_ID_ANM: maxpixels /= 1024; break;
214 case AV_CODEC_ID_ARBC: maxpixels /= 1024; break;
215 case AV_CODEC_ID_ARGO: maxpixels /= 1024; break;
216 case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break;
217 case AV_CODEC_ID_CDTOONS: maxpixels /= 1024; break;
218 case AV_CODEC_ID_CFHD: maxpixels /= 16384; break;
219 case AV_CODEC_ID_CINEPAK: maxpixels /= 128; break;
220 case AV_CODEC_ID_COOK: maxsamples /= 1<<20; break;
221 case AV_CODEC_ID_CSCD: maxpixels /= 1024; break;
222 case AV_CODEC_ID_DFA: maxpixels /= 1024; break;
223 case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break;
224 case AV_CODEC_ID_DSICINVIDEO: maxpixels /= 1024; break;
225 case AV_CODEC_ID_DST: maxsamples /= 1<<20; break;
226 case AV_CODEC_ID_DVB_SUBTITLE: av_dict_set_int(&opts, "compute_clut", -2, 0); break;
227 case AV_CODEC_ID_DXA: maxpixels /= 32; break;
228 case AV_CODEC_ID_DXV: maxpixels /= 32; break;
229 case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break;
230 case AV_CODEC_ID_FLAC: maxsamples /= 1024; break;
231 case AV_CODEC_ID_FLIC: maxpixels /= 1024; break;
232 case AV_CODEC_ID_FLV1: maxpixels /= 1024; break;
233 case AV_CODEC_ID_G2M: maxpixels /= 1024; break;
234 case AV_CODEC_ID_GEM: maxpixels /= 512; break;
235 case AV_CODEC_ID_GDV: maxpixels /= 512; break;
236 case AV_CODEC_ID_GIF: maxpixels /= 16; break;
237 case AV_CODEC_ID_H264: maxpixels /= 256; break;
238 case AV_CODEC_ID_HAP: maxpixels /= 128; break;
239 case AV_CODEC_ID_HEVC: maxpixels /= 16384; break;
240 case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break;
241 case AV_CODEC_ID_HQ_HQA: maxpixels /= 128; break;
242 case AV_CODEC_ID_IFF_ILBM: maxpixels /= 128; break;
243 case AV_CODEC_ID_INDEO4: maxpixels /= 128; break;
244 case AV_CODEC_ID_INTERPLAY_ACM: maxsamples /= 16384; break;
245 case AV_CODEC_ID_JPEG2000: maxpixels /= 16; break;
246 case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break;
247 case AV_CODEC_ID_LOCO: maxpixels /= 1024; break;
248 case AV_CODEC_ID_VORBIS: maxsamples /= 1024; break;
249 case AV_CODEC_ID_LSCR: maxpixels /= 16; break;
250 case AV_CODEC_ID_MMVIDEO: maxpixels /= 256; break;
251 case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break;
252 case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; break;
253 case AV_CODEC_ID_MSA1: maxpixels /= 16384; break;
254 case AV_CODEC_ID_MSRLE: maxpixels /= 16; break;
255 case AV_CODEC_ID_MSS2: maxpixels /= 16384; break;
256 case AV_CODEC_ID_MSZH: maxpixels /= 128; break;
257 case AV_CODEC_ID_MVC2: maxpixels /= 128; break;
258 case AV_CODEC_ID_MXPEG: maxpixels /= 128; break;
259 case AV_CODEC_ID_OPUS: maxsamples /= 16384; break;
260 case AV_CODEC_ID_PNG: maxpixels /= 128; break;
261 case AV_CODEC_ID_APNG: maxpixels /= 128; break;
262 case AV_CODEC_ID_QTRLE: maxpixels /= 16; break;
263 case AV_CODEC_ID_PAF_VIDEO: maxpixels /= 16; break;
264 case AV_CODEC_ID_PRORES: maxpixels /= 256; break;
265 case AV_CODEC_ID_RASC: maxpixels /= 16; break;
266 case AV_CODEC_ID_RTV1: maxpixels /= 16; break;
267 case AV_CODEC_ID_SANM: maxpixels /= 16; break;
268 case AV_CODEC_ID_SCPR: maxpixels /= 32; break;
269 case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break;
270 case AV_CODEC_ID_SIMBIOSIS_IMX:maxpixels /= 16384; break;
271 case AV_CODEC_ID_SPEEX: maxsamples /= 128; break;
272 case AV_CODEC_ID_SMACKAUDIO: maxsamples /= 4096; break;
273 case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break;
274 case AV_CODEC_ID_SNOW: maxpixels /= 128; break;
275 case AV_CODEC_ID_TARGA: maxpixels /= 128; break;
276 case AV_CODEC_ID_TAK: maxsamples /= 1024; break;
277 case AV_CODEC_ID_TGV: maxpixels /= 32; break;
278 case AV_CODEC_ID_THEORA: maxpixels /= 16384; break;
279 case AV_CODEC_ID_TQI: maxpixels /= 1024; break;
280 case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break;
281 case AV_CODEC_ID_TSCC: maxpixels /= 1024; break;
282 case AV_CODEC_ID_VC1: maxpixels /= 8192; break;
283 case AV_CODEC_ID_VC1IMAGE: maxpixels /= 8192; break;
284 case AV_CODEC_ID_VMNC: maxpixels /= 8192; break;
285 case AV_CODEC_ID_VP3: maxpixels /= 4096; break;
286 case AV_CODEC_ID_VP4: maxpixels /= 4096; break;
287 case AV_CODEC_ID_VP5: maxpixels /= 256; break;
288 case AV_CODEC_ID_VP6F: maxpixels /= 4096; break;
289 case AV_CODEC_ID_VP7: maxpixels /= 256; break;
290 case AV_CODEC_ID_VP9: maxpixels /= 4096; break;
291 case AV_CODEC_ID_WAVPACK: maxsamples /= 1024; break;
292 case AV_CODEC_ID_WCMV: maxpixels /= 1024; break;
293 case AV_CODEC_ID_WMV3IMAGE: maxpixels /= 8192; break;
294 case AV_CODEC_ID_WMV2: maxpixels /= 1024; break;
295 case AV_CODEC_ID_WMV3: maxpixels /= 1024; break;
296 case AV_CODEC_ID_WS_VQA: maxpixels /= 16384; break;
297 case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024; break;
298 case AV_CODEC_ID_WMAPRO: maxsamples /= 16384; break;
299 case AV_CODEC_ID_YLC: maxpixels /= 1024; break;
300 case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break;
301 }
302
303 maxsamples_per_frame = FFMIN(maxsamples_per_frame, maxsamples);
304 maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels);
305
306 AVCodecContext* ctx = avcodec_alloc_context3(&c->p);
307 AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL);
308 if (!ctx || !parser_avctx)
309 error("Failed memory allocation");
310
311 if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame)
312 ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs
313
314 ctx->max_samples = maxsamples_per_frame;
315 ctx->get_buffer2 = fuzz_get_buffer2;
316
317 if (size > 1024) {
318 GetByteContext gbc;
319 int extradata_size;
320 int flags;
321 uint64_t request_channel_layout;
322 int64_t flags64;
323
324 size -= 1024;
325 bytestream2_init(&gbc, data + size, 1024);
326 ctx->width = bytestream2_get_le32(&gbc);
327 ctx->height = bytestream2_get_le32(&gbc);
328 ctx->bit_rate = bytestream2_get_le64(&gbc);
329 ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc);
330 // Try to initialize a parser for this codec, note, this may fail which just means we test without one
331 flags = bytestream2_get_byte(&gbc);
332 if (flags & 1)
333 parser = av_parser_init(c->p.id);
334 if (flags & 2)
335 ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL;
336 if (flags & 4) {
337 ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL;
338 if (flags & 8)
339 ctx->err_recognition |= AV_EF_EXPLODE;
340 }
341 if ((flags & 0x10) && c->p.id != AV_CODEC_ID_H264)
342 ctx->flags2 |= AV_CODEC_FLAG2_FAST;
343 if (flags & 0x80)
344 ctx->flags2 |= AV_CODEC_FLAG2_EXPORT_MVS;
345
346 if (flags & 0x40)
347 av_force_cpu_flags(0);
348
349 extradata_size = bytestream2_get_le32(&gbc);
350
351 ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
352 ctx->ch_layout.nb_channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
353 ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF;
354 ctx->codec_tag = bytestream2_get_le32(&gbc);
355 if (c->codec_tags) {
356 int n;
357 for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++);
358 ctx->codec_tag = c->codec_tags[ctx->codec_tag % n];
359 }
360 keyframes = bytestream2_get_le64(&gbc);
361 request_channel_layout = bytestream2_get_le64(&gbc);
362
363 ctx->idct_algo = bytestream2_get_byte(&gbc) % 25;
364 flushpattern = bytestream2_get_le64(&gbc);
365 ctx->skip_frame = bytestream2_get_byte(&gbc) - 254 + AVDISCARD_ALL;
366
367
368 if (flags & 0x20) {
369 switch (ctx->codec_id) {
370 case AV_CODEC_ID_AC3:
371 case AV_CODEC_ID_EAC3:
372 av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0);
373 av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0);
374 av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0);
375 av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0);
376 break;
377 }
378 }
379
380 // Keep the deprecated request_channel_layout behavior to ensure old fuzzing failures
381 // remain reproducible.
382 if (request_channel_layout) {
383 switch (ctx->codec_id) {
384 case AV_CODEC_ID_AC3:
385 case AV_CODEC_ID_EAC3:
386 case AV_CODEC_ID_MLP:
387 case AV_CODEC_ID_TRUEHD:
388 case AV_CODEC_ID_DTS:
389 if (request_channel_layout & ~INT64_MIN) {
390 char *downmix_layout = av_mallocz(19);
391 if (!downmix_layout)
392 error("Failed memory allocation");
393 av_strlcatf(downmix_layout, 19, "0x%"PRIx64, request_channel_layout & ~INT64_MIN);
394 av_dict_set(&opts, "downmix", downmix_layout, AV_DICT_DONT_STRDUP_VAL);
395 }
396 if (ctx->codec_id != AV_CODEC_ID_DTS)
397 break;
398 // fall-through
399 case AV_CODEC_ID_DOLBY_E:
400 av_dict_set_int(&opts, "channel_order", !!(request_channel_layout & INT64_MIN), 0);
401 break;
402 }
403 }
404
405 flags64 = bytestream2_get_le64(&gbc);
406 if (flags64 &1)
407 ctx->debug |= FF_DEBUG_SKIP;
408 if (flags64 &2)
409 ctx->debug |= FF_DEBUG_QP;
410 if (flags64 &4)
411 ctx->debug |= FF_DEBUG_MB_TYPE;
412
413 if (extradata_size < size) {
414 ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
415 if (ctx->extradata) {
416 ctx->extradata_size = extradata_size;
417 size -= ctx->extradata_size;
418 memcpy(ctx->extradata, data + size, ctx->extradata_size);
419 }
420 }
421 if (av_image_check_size(ctx->width, ctx->height, 0, ctx))
422 ctx->width = ctx->height = 0;
423 }
424
425 int res = avcodec_open2(ctx, &c->p, &opts);
426 if (res < 0) {
427 avcodec_free_context(&ctx);
428 av_free(parser_avctx);
429 av_parser_close(parser);
430 av_dict_free(&opts);
431 return 0; // Failure of avcodec_open2() does not imply that a issue was found
432 }
433 parser_avctx->codec_id = ctx->codec_id;
434 parser_avctx->extradata_size = ctx->extradata_size;
435 parser_avctx->extradata = ctx->extradata ? av_memdup(ctx->extradata, ctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE) : NULL;
436
437
438 int got_frame;
439 AVFrame *frame = av_frame_alloc();
440 AVPacket *avpkt = av_packet_alloc();
441 AVPacket *parsepkt = av_packet_alloc();
442 if (!frame || !avpkt || !parsepkt)
443 error("Failed memory allocation");
444
445 // Read very simple container
446 while (data < end && it < maxiteration) {
447 // Search for the TAG
448 while (data + sizeof(fuzz_tag) < end) {
449 if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
450 break;
451 data++;
452 }
453 if (data + sizeof(fuzz_tag) > end)
454 data = end;
455
456 res = av_new_packet(parsepkt, data - last);
457 if (res < 0)
458 error("Failed memory allocation");
459 memcpy(parsepkt->data, last, data - last);
460 parsepkt->flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
461 keyframes = (keyframes >> 2) + (keyframes<<62);
462 data += sizeof(fuzz_tag);
463 last = data;
464
465 while (parsepkt->size > 0) {
466 int decode_more;
467
468 if (parser) {
469 int ret = av_parser_parse2(parser, parser_avctx, &avpkt->data, &avpkt->size,
470 parsepkt->data, parsepkt->size,
471 parsepkt->pts, parsepkt->dts, parsepkt->pos);
472 if (avpkt->data == parsepkt->data) {
473 avpkt->buf = av_buffer_ref(parsepkt->buf);
474 if (!avpkt->buf)
475 error("Failed memory allocation");
476 } else {
477 if (av_packet_make_refcounted(avpkt) < 0)
478 error("Failed memory allocation");
479 }
480 parsepkt->data += ret;
481 parsepkt->size -= ret;
482 parsepkt->pos += ret;
483 avpkt->pts = parser->pts;
484 avpkt->dts = parser->dts;
485 avpkt->pos = parser->pos;
486 if ( parser->key_frame == 1 ||
487 (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I))
488 avpkt->flags |= AV_PKT_FLAG_KEY;
489 avpkt->flags |= parsepkt->flags & AV_PKT_FLAG_DISCARD;
490 } else {
491 av_packet_move_ref(avpkt, parsepkt);
492 }
493
494 if (!(flushpattern & 7))
495 avcodec_flush_buffers(ctx);
496 flushpattern = (flushpattern >> 3) + (flushpattern << 61);
497
498 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE) {
499 int ret = avcodec_send_packet(ctx, avpkt);
500 decode_more = ret >= 0;
501 if(!decode_more) {
502 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
503 if (it > 20 || ec_pixels > 4 * ctx->max_pixels) {
504 ctx->error_concealment = 0;
505 ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE);
506 }
507 if (ec_pixels > maxpixels)
508 goto maximums_reached;
509 }
510 } else
511 decode_more = 1;
512
513 // Iterate through all data
514 while (decode_more && it++ < maxiteration) {
515 av_frame_unref(frame);
516 int ret = decode_handler(ctx, frame, &got_frame, avpkt);
517
518 ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL);
519 if (it > 20 || ec_pixels > 4 * ctx->max_pixels) {
520 ctx->error_concealment = 0;
521 ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE);
522 }
523 if (ec_pixels > maxpixels)
524 goto maximums_reached;
525
526 if (ctx->codec_type == AVMEDIA_TYPE_AUDIO &&
527 frame->nb_samples == 0 && !got_frame &&
528 (avpkt->flags & AV_PKT_FLAG_DISCARD))
529 nb_samples += ctx->max_samples;
530
531 nb_samples += frame->nb_samples;
532 if (nb_samples > maxsamples)
533 goto maximums_reached;
534
535 if (ret <= 0 || ret > avpkt->size)
536 break;
537
538 if (ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) {
539 avpkt->data += ret;
540 avpkt->size -= ret;
541 decode_more = avpkt->size > 0;
542 } else
543 decode_more = ret >= 0;
544 }
545 av_packet_unref(avpkt);
546 }
547 av_packet_unref(parsepkt);
548 }
549 maximums_reached:
550
551 av_packet_unref(avpkt);
552
553 if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE)
554 avcodec_send_packet(ctx, NULL);
555
556 do {
557 got_frame = 0;
558 av_frame_unref(frame);
559 decode_handler(ctx, frame, &got_frame, avpkt);
560
561 nb_samples += frame->nb_samples;
562 if (nb_samples > maxsamples)
563 break;
564 } while (got_frame == 1 && it++ < maxiteration);
565
566 fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it);
567
568 av_frame_free(&frame);
569 avcodec_free_context(&ctx);
570 avcodec_free_context(&parser_avctx);
571 av_parser_close(parser);
572 av_packet_free(&avpkt);
573 av_packet_free(&parsepkt);
574 av_dict_free(&opts);
575 return 0;
576 }
577