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tools/target_dec_fuzzer.c
656 строк
27 KB
Kacper Michajłow
tools/target_dec_fuzzer: use av_fallthrough to avoid warning
21 июл 2026, 21:48
21 июл 2026, 21:48
4488949
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/* * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ /* Targeted fuzzer that targets specific codecs depending on two compile-time flags. INSTRUCTIONS: * Get clang > 6.0 (https://llvm.org/docs/LibFuzzer.html) * Build ffmpeg for fuzzing: ./configure --enable-debug --toolchain=clang-asan-ubsan-fuzz --enable-ossfuzz make clean && make -j * build the fuzz target. make tools/target_dec_<codec>_fuzzer # e.g. tools/target_dec_jpeg2000_fuzzer * Run fuzzing with a corpus directory: mkdir CORPUS && cp some-files CORPUS # (empty corpus dir is ok too) ./tools/target_dec_<codec>_fuzzer -max_len=100000 CORPUS * Run a test case: ./tools/target_dec_<codec>_fuzzer <testcase> More info: http://libfuzzer.info http://tutorial.libfuzzer.info https://github.com/google/oss-fuzz http://lcamtuf.coredump.cx/afl/ https://security.googleblog.com/2016/08/guided-in-process-fuzzing-of-chrome.html */ #include "config.h" #include "libavutil/avassert.h" #include "libavutil/avstring.h" #include "libavutil/cpu.h" #include "libavutil/imgutils.h" #include "libavutil/intreadwrite.h" #include "libavutil/mem.h" #include "libavcodec/avcodec.h" #include "libavcodec/bytestream.h" #include "libavcodec/codec_internal.h" #include "libavformat/avformat.h" //For FF_SANE_NB_CHANNELS, so we dont waste energy testing things that will get instantly rejected #include "libavcodec/internal.h" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size); extern const FFCodec * codec_list[]; static void error(const char *err) { fprintf(stderr, "%s", err); exit(1); } static const FFCodec *c = NULL; #ifndef FFMPEG_DECODER static const FFCodec *AVCodecInitialize(enum AVCodecID codec_id) { const AVCodec *res; res = avcodec_find_decoder(codec_id); if (!res) error("Failed to find decoder"); return ffcodec(res); } #endif static int subtitle_handler(AVCodecContext *avctx, AVFrame *unused, int *got_sub_ptr, const AVPacket *avpkt) { AVSubtitle sub; int ret = avcodec_decode_subtitle2(avctx, &sub, got_sub_ptr, avpkt); av_assert0(ret != AVERROR_BUG); if (ret >= 0 && *got_sub_ptr) avsubtitle_free(&sub); return ret; } static int audio_video_handler(AVCodecContext *avctx, AVFrame *frame, int *got_frame, const AVPacket *dummy) { int ret = avcodec_receive_frame(avctx, frame); av_assert0(ret != AVERROR_BUG); *got_frame = ret >= 0; return ret; } // Ensure we don't loop forever const uint32_t maxiteration = 8096; static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL; static uint64_t alloc_pixels; static uint64_t max_alloc_pixels; static int fuzz_video_get_buffer(AVCodecContext *ctx, AVFrame *frame) { ptrdiff_t linesize1[4]; size_t size[4]; int linesize_align[AV_NUM_DATA_POINTERS]; int i, ret, w = frame->width, h = frame->height; avcodec_align_dimensions2(ctx, &w, &h, linesize_align); alloc_pixels += (uint64_t)w * h; if (alloc_pixels > max_alloc_pixels) return AVERROR(ENOMEM); ret = av_image_fill_linesizes(frame->linesize, ctx->pix_fmt, w); if (ret < 0) return ret; for (i = 0; i < 4 && frame->linesize[i]; i++) linesize1[i] = frame->linesize[i] = FFALIGN(frame->linesize[i], linesize_align[i]); for (; i < 4; i++) linesize1[i] = 0; ret = av_image_fill_plane_sizes(size, ctx->pix_fmt, h, linesize1); if (ret < 0) return ret; frame->extended_data = frame->data; for (i = 0; i < 4 && size[i]; i++) { switch(ctx->codec_id) { case AV_CODEC_ID_FFV1: frame->buf[i] = av_buffer_alloc(size[i]); break; default: frame->buf[i] = av_buffer_allocz(size[i]); } if (!frame->buf[i]) goto fail; frame->data[i] = frame->buf[i]->data; } for (; i < AV_NUM_DATA_POINTERS; i++) { frame->data[i] = NULL; frame->linesize[i] = 0; } return 0; fail: av_frame_unref(frame); return AVERROR(ENOMEM); } static int fuzz_get_buffer2(AVCodecContext *ctx, AVFrame *frame, int flags) { switch (ctx->codec_type) { case AVMEDIA_TYPE_VIDEO: return (ctx->codec->capabilities & AV_CODEC_CAP_DR1) ? fuzz_video_get_buffer(ctx, frame) : avcodec_default_get_buffer2(ctx, frame, flags); case AVMEDIA_TYPE_AUDIO: return avcodec_default_get_buffer2(ctx, frame, flags); default: return AVERROR(EINVAL); } } int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) { uint64_t maxpixels_per_frame = 4096 * 4096; uint64_t maxpixels; uint64_t maxsamples_per_frame = 256*1024*32; uint64_t maxsamples; const uint64_t fuzz_tag = FUZZ_TAG; const uint8_t *last = data; const uint8_t *end = data + size; uint32_t it = 0; uint64_t ec_pixels = 0; uint64_t nb_samples = 0; int (*decode_handler)(AVCodecContext *avctx, AVFrame *picture, int *got_picture_ptr, const AVPacket *avpkt) = NULL; AVCodecParserContext *parser = NULL; uint64_t keyframes = 0; uint64_t flushpattern = -1; AVDictionary *opts = NULL; if (!c) { #ifdef FFMPEG_DECODER #define DECODER_SYMBOL0(CODEC) ff_##CODEC##_decoder #define DECODER_SYMBOL(CODEC) DECODER_SYMBOL0(CODEC) extern FFCodec DECODER_SYMBOL(FFMPEG_DECODER); codec_list[0] = &DECODER_SYMBOL(FFMPEG_DECODER); c = &DECODER_SYMBOL(FFMPEG_DECODER); #else c = AVCodecInitialize(FFMPEG_CODEC); // Done once. #endif av_log_set_level(AV_LOG_PANIC); } switch (c->p.type) { case AVMEDIA_TYPE_AUDIO : case AVMEDIA_TYPE_VIDEO : decode_handler = audio_video_handler ; break; case AVMEDIA_TYPE_SUBTITLE: decode_handler = subtitle_handler ; break; } switch (c->p.id) { case AV_CODEC_ID_APE: maxsamples_per_frame /= 256; break; } maxpixels = maxpixels_per_frame * maxiteration; maxsamples = maxsamples_per_frame * maxiteration; switch (c->p.id) { case AV_CODEC_ID_4XM: maxpixels /= 64; break; case AV_CODEC_ID_AASC: maxpixels /= 1024; break; case AV_CODEC_ID_AGM: maxpixels /= 1024; break; case AV_CODEC_ID_ANM: maxpixels /= 1024; break; case AV_CODEC_ID_APE: maxsamples /= 16384; break; case AV_CODEC_ID_ARBC: maxpixels /= 1024; break; case AV_CODEC_ID_ARGO: maxpixels /= 1024; break; case AV_CODEC_ID_BETHSOFTVID: maxpixels /= 8192; break; case AV_CODEC_ID_BFI: maxpixels /= 8192; break; case AV_CODEC_ID_BINKVIDEO: maxpixels /= 32; break; case AV_CODEC_ID_BMP: maxpixels /= 16; break; case AV_CODEC_ID_BONK: maxsamples /= 1<<20; break; case AV_CODEC_ID_CAVS: maxpixels /= 1024; break; case AV_CODEC_ID_CDTOONS: maxpixels /= 1024; break; case AV_CODEC_ID_CFHD: maxpixels /= 16384; break; case AV_CODEC_ID_CINEPAK: maxpixels /= 128; break; case AV_CODEC_ID_COOK: maxsamples /= 1<<20; break; case AV_CODEC_ID_CPIA: maxpixels /= 256; break; case AV_CODEC_ID_CRI: maxpixels /= 1024; break; case AV_CODEC_ID_CSCD: maxpixels /= 1024; break; case AV_CODEC_ID_DFA: maxpixels /= 1024; break; case AV_CODEC_ID_DIRAC: maxpixels /= 8192; break; case AV_CODEC_ID_DSICINVIDEO: maxpixels /= 1024; break; case AV_CODEC_ID_DST: maxsamples /= 1<<20; break; case AV_CODEC_ID_DVB_SUBTITLE: av_dict_set_int(&opts, "compute_clut", -2, 0); break; case AV_CODEC_ID_DXA: maxpixels /= 32; break; case AV_CODEC_ID_DXV: maxpixels /= 32; break; case AV_CODEC_ID_CMV: maxpixels /= 256; break; case AV_CODEC_ID_EXR: maxpixels /= 1024; break; case AV_CODEC_ID_FFV1: maxpixels /= 32; break; case AV_CODEC_ID_FFWAVESYNTH: maxsamples /= 16384; break; case AV_CODEC_ID_FLAC: maxsamples /= 1024; break; case AV_CODEC_ID_FLIC: maxpixels /= 1024; break; case AV_CODEC_ID_FLV1: maxpixels /= 1024; break; case AV_CODEC_ID_FMVC: maxpixels /= 1024; break; case AV_CODEC_ID_G2M: maxpixels /= 16384; break; case AV_CODEC_ID_GEM: maxpixels /= 512; break; case AV_CODEC_ID_GDV: maxpixels /= 512; break; case AV_CODEC_ID_GIF: maxpixels /= 16; break; case AV_CODEC_ID_H264: maxpixels /= 256; break; case AV_CODEC_ID_HAP: maxpixels /= 128; break; case AV_CODEC_ID_HEVC: maxpixels /= 16384; break; case AV_CODEC_ID_HNM4_VIDEO: maxpixels /= 128; break; case AV_CODEC_ID_HQ_HQA: maxpixels /= 128; break; case AV_CODEC_ID_IFF_ILBM: maxpixels /= 4096; break; case AV_CODEC_ID_INDEO4: maxpixels /= 128; break; case AV_CODEC_ID_INDEO5: maxpixels /= 1024; break; case AV_CODEC_ID_INTERPLAY_ACM: maxsamples /= 16384; break; case AV_CODEC_ID_INTERPLAY_VIDEO: maxpixels /= 256; break; case AV_CODEC_ID_JPEG2000: maxpixels /= 16384; break; case AV_CODEC_ID_JV: maxpixels /= 16384; break; case AV_CODEC_ID_LAGARITH: maxpixels /= 1024; break; case AV_CODEC_ID_LOCO: maxpixels /= 1024; break; case AV_CODEC_ID_VORBIS: maxsamples /= 1024; break; case AV_CODEC_ID_LSCR: maxpixels /= 16; break; case AV_CODEC_ID_MAGICYUV: maxpixels /= 256; break; case AV_CODEC_ID_MMVIDEO: maxpixels /= 256; break; case AV_CODEC_ID_MOTIONPIXELS:maxpixels /= 256; break; case AV_CODEC_ID_MP4ALS: maxsamples /= 65536; av_dict_set_int(&opts, "max_order", 15, 0); break; case AV_CODEC_ID_MUSEPACK8: maxsamples /= 16384; break; case AV_CODEC_ID_MSA1: maxpixels /= 16384; break; case AV_CODEC_ID_MSCC: maxpixels /= 4096; break; case AV_CODEC_ID_MSRLE: maxpixels /= 16; break; case AV_CODEC_ID_MSS2: maxpixels /= 16384; break; case AV_CODEC_ID_MSZH: maxpixels /= 128; break; case AV_CODEC_ID_MTS2: maxpixels /= 4096; break; case AV_CODEC_ID_MV30: maxpixels /= 128; break; case AV_CODEC_ID_MVC1: maxpixels /= 1024; break; case AV_CODEC_ID_MVC2: maxpixels /= 128; break; case AV_CODEC_ID_MVHA: maxpixels /= 16384; break; case AV_CODEC_ID_MVDV: maxpixels /= 1024; break; case AV_CODEC_ID_MWSC: maxpixels /= 256; break; case AV_CODEC_ID_MXPEG: maxpixels /= 128; break; case AV_CODEC_ID_NUV: maxpixels /= 128; break; case AV_CODEC_ID_OPUS: maxsamples /= 16384; break; case AV_CODEC_ID_PIXLET: maxpixels /= 1024; break; case AV_CODEC_ID_PNG: maxpixels /= 128; break; case AV_CODEC_ID_APNG: maxpixels /= 128; break; case AV_CODEC_ID_QTRLE: maxpixels /= 16; break; case AV_CODEC_ID_PAF_VIDEO: maxpixels /= 16; break; case AV_CODEC_ID_PRORES: maxpixels /= 256; break; case AV_CODEC_ID_QDRAW: maxpixels /= 256; break; case AV_CODEC_ID_QOI: maxpixels /= 256; break; case AV_CODEC_ID_QPEG: maxpixels /= 256; break; case AV_CODEC_ID_RKA: maxsamples /= 1<<20; break; case AV_CODEC_ID_RSCC: maxpixels /= 256; break; case AV_CODEC_ID_RASC: maxpixels /= 256; break; case AV_CODEC_ID_RTV1: maxpixels /= 16; break; case AV_CODEC_ID_RV30: maxpixels /= 256; break; case AV_CODEC_ID_RV60: maxpixels /= 256; break; case AV_CODEC_ID_SANM: maxpixels /= 16; break; case AV_CODEC_ID_SCPR: maxpixels /= 32; break; case AV_CODEC_ID_SCREENPRESSO:maxpixels /= 64; break; case AV_CODEC_ID_SGA_VIDEO: maxpixels /= 256; break; case AV_CODEC_ID_SIMBIOSIS_IMX:maxpixels /= 16384; break; case AV_CODEC_ID_SPEEX: maxsamples /= 128; break; case AV_CODEC_ID_SMACKAUDIO: maxsamples /= 4096; break; case AV_CODEC_ID_SMACKVIDEO: maxpixels /= 64; break; case AV_CODEC_ID_SNOW: maxpixels /= 128; break; case AV_CODEC_ID_SRGC: maxpixels /= 128; break; case AV_CODEC_ID_TARGA: maxpixels /= 128; break; case AV_CODEC_ID_TAK: maxsamples /= 1024; break; case AV_CODEC_ID_TDSC: maxpixels /= 128; break; case AV_CODEC_ID_TGV: maxpixels /= 32; break; case AV_CODEC_ID_THEORA: maxpixels /= 16384; break; case AV_CODEC_ID_TQI: maxpixels /= 1024; break; case AV_CODEC_ID_TRUEMOTION2: maxpixels /= 1024; break; case AV_CODEC_ID_TSCC: maxpixels /= 1024; break; case AV_CODEC_ID_UTVIDEO: maxpixels /= 1024; break; case AV_CODEC_ID_VB: maxpixels /= 1024; break; case AV_CODEC_ID_VC1: maxpixels /= 8192; break; case AV_CODEC_ID_VC1IMAGE: maxpixels /= 8192; break; case AV_CODEC_ID_VMNC: maxpixels /= 8192; break; case AV_CODEC_ID_VMDVIDEO: maxpixels /= 1024; break; case AV_CODEC_ID_VMIX: maxpixels /= 8192; break; case AV_CODEC_ID_VP3: maxpixels /= 4096; break; case AV_CODEC_ID_VP4: maxpixels /= 4096; break; case AV_CODEC_ID_VP5: maxpixels /= 256; break; case AV_CODEC_ID_VP6: maxpixels /= 4096; break; case AV_CODEC_ID_VP6F: maxpixels /= 4096; break; case AV_CODEC_ID_VP6A: maxpixels /= 4096; break; case AV_CODEC_ID_VP7: maxpixels /= 256; break; case AV_CODEC_ID_VP8: maxpixels /= 256; break; case AV_CODEC_ID_VP9: maxpixels /= 4096; break; case AV_CODEC_ID_WAVPACK: maxsamples /= 1024; break; case AV_CODEC_ID_WCMV: maxpixels /= 1024; break; case AV_CODEC_ID_WEBP: maxpixels /= 1024; break; case AV_CODEC_ID_WMV3IMAGE: maxpixels /= 8192; break; case AV_CODEC_ID_WMV2: maxpixels /= 1024; break; case AV_CODEC_ID_WMV3: maxpixels /= 1024; break; case AV_CODEC_ID_WS_VQA: maxpixels /= 16384; break; case AV_CODEC_ID_WMALOSSLESS: maxsamples /= 1024; break; case AV_CODEC_ID_WMAPRO: maxsamples /= 16384; break; case AV_CODEC_ID_XAN_WC3: maxpixels /= 1024; break; case AV_CODEC_ID_YLC: maxpixels /= 1024; break; case AV_CODEC_ID_ZEROCODEC: maxpixels /= 128; break; case AV_CODEC_ID_ZLIB: maxpixels /= 4096; break; case AV_CODEC_ID_ZMBV: maxpixels /= 4096; break; } maxsamples_per_frame = FFMIN(maxsamples_per_frame, maxsamples); maxpixels_per_frame = FFMIN(maxpixels_per_frame , maxpixels); alloc_pixels = 0; max_alloc_pixels = maxpixels; AVCodecContext* ctx = avcodec_alloc_context3(&c->p); AVCodecContext* parser_avctx = avcodec_alloc_context3(NULL); if (!ctx || !parser_avctx) error("Failed memory allocation"); if (ctx->max_pixels == 0 || ctx->max_pixels > maxpixels_per_frame) ctx->max_pixels = maxpixels_per_frame; //To reduce false positive OOM and hangs ctx->max_samples = maxsamples_per_frame; ctx->get_buffer2 = fuzz_get_buffer2; if (c->p.capabilities & AV_CODEC_CAP_EXPERIMENTAL) ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; if (size > 1024) { GetByteContext gbc; int extradata_size; int flags; uint64_t request_channel_layout; int64_t flags64; size -= 1024; bytestream2_init(&gbc, data + size, 1024); ctx->width = bytestream2_get_le32(&gbc); ctx->height = bytestream2_get_le32(&gbc); ctx->bit_rate = bytestream2_get_le64(&gbc); ctx->bits_per_coded_sample = bytestream2_get_le32(&gbc); // Try to initialize a parser for this codec, note, this may fail which just means we test without one flags = bytestream2_get_byte(&gbc); if (flags & 1) parser = av_parser_init(c->p.id); if (flags & 2) ctx->strict_std_compliance = FF_COMPLIANCE_EXPERIMENTAL; if (flags & 4) { ctx->err_recognition = AV_EF_AGGRESSIVE | AV_EF_COMPLIANT | AV_EF_CAREFUL; if (flags & 8) ctx->err_recognition |= AV_EF_EXPLODE; } if ((flags & 0x10) && c->p.id != AV_CODEC_ID_H264) ctx->flags2 |= AV_CODEC_FLAG2_FAST; if (flags & 0x80) ctx->export_side_data |= AV_CODEC_EXPORT_DATA_MVS; if (flags & 0x40) av_force_cpu_flags(0); extradata_size = bytestream2_get_le32(&gbc); ctx->sample_rate = bytestream2_get_le32(&gbc) & 0x7FFFFFFF; ctx->ch_layout.nb_channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS; ctx->block_align = bytestream2_get_le32(&gbc) & 0x7FFFFFFF; ctx->codec_tag = bytestream2_get_le32(&gbc); if (c->codec_tags) { int n; for (n = 0; c->codec_tags[n] != FF_CODEC_TAGS_END; n++); ctx->codec_tag = c->codec_tags[ctx->codec_tag % n]; } keyframes = bytestream2_get_le64(&gbc); request_channel_layout = bytestream2_get_le64(&gbc); ctx->idct_algo = bytestream2_get_byte(&gbc) % 25; flushpattern = bytestream2_get_le64(&gbc); ctx->skip_frame = bytestream2_get_byte(&gbc) - 254 + AVDISCARD_ALL; if (flags & 0x20) { switch (ctx->codec_id) { case AV_CODEC_ID_AC3: case AV_CODEC_ID_EAC3: av_dict_set_int(&opts, "cons_noisegen", bytestream2_get_byte(&gbc) & 1, 0); av_dict_set_int(&opts, "heavy_compr", bytestream2_get_byte(&gbc) & 1, 0); av_dict_set_int(&opts, "target_level", (int)(bytestream2_get_byte(&gbc) % 32) - 31, 0); av_dict_set_int(&opts, "dmix_mode", (int)(bytestream2_get_byte(&gbc) % 4) - 1, 0); break; } } // Keep the deprecated request_channel_layout behavior to ensure old fuzzing failures // remain reproducible. if (request_channel_layout) { switch (ctx->codec_id) { case AV_CODEC_ID_AC3: case AV_CODEC_ID_EAC3: case AV_CODEC_ID_MLP: case AV_CODEC_ID_TRUEHD: case AV_CODEC_ID_DTS: if (request_channel_layout & ~INT64_MIN) { char *downmix_layout = av_mallocz(19); if (!downmix_layout) error("Failed memory allocation"); av_strlcatf(downmix_layout, 19, "0x%"PRIx64, request_channel_layout & ~INT64_MIN); av_dict_set(&opts, "downmix", downmix_layout, AV_DICT_DONT_STRDUP_VAL); } if (ctx->codec_id != AV_CODEC_ID_DTS) break; av_fallthrough; case AV_CODEC_ID_DOLBY_E: av_dict_set_int(&opts, "channel_order", !!(request_channel_layout & INT64_MIN), 0); break; } } flags64 = bytestream2_get_le64(&gbc); if (flags64 &1) ctx->debug |= FF_DEBUG_SKIP; if (flags64 &2) ctx->debug |= FF_DEBUG_QP; if (flags64 &4) ctx->debug |= FF_DEBUG_MB_TYPE; if (flags64 & 8) ctx->export_side_data |= AV_CODEC_EXPORT_DATA_VIDEO_ENC_PARAMS; if (flags64 & 0x10) ctx->err_recognition |= AV_EF_CRCCHECK; ctx->workaround_bugs = bytestream2_get_le32(&gbc); if (c->p.max_lowres) { ctx->lowres = bytestream2_get_byte(&gbc) % (c->p.max_lowres+1); } if (extradata_size < size) { ctx->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE); if (ctx->extradata) { ctx->extradata_size = extradata_size; size -= ctx->extradata_size; memcpy(ctx->extradata, data + size, ctx->extradata_size); } } if (av_image_check_size(ctx->width, ctx->height, 0, ctx)) ctx->width = ctx->height = 0; } int res = avcodec_open2(ctx, &c->p, &opts); if (res < 0) { av_assert0(res != AVERROR_BUG); avcodec_free_context(&ctx); av_free(parser_avctx); av_parser_close(parser); av_dict_free(&opts); return 0; // Failure of avcodec_open2() does not imply that a issue was found } parser_avctx->codec_id = ctx->codec_id; parser_avctx->extradata_size = ctx->extradata_size; parser_avctx->extradata = ctx->extradata ? av_memdup(ctx->extradata, ctx->extradata_size + AV_INPUT_BUFFER_PADDING_SIZE) : NULL; int got_frame; AVFrame *frame = av_frame_alloc(); AVPacket *avpkt = av_packet_alloc(); AVPacket *parsepkt = av_packet_alloc(); if (!frame || !avpkt || !parsepkt) error("Failed memory allocation"); // Read very simple container while (data < end && it < maxiteration) { // Search for the TAG while (data + sizeof(fuzz_tag) < end) { if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag) break; data++; } if (data + sizeof(fuzz_tag) > end) data = end; res = av_new_packet(parsepkt, data - last); if (res < 0) error("Failed memory allocation"); memcpy(parsepkt->data, last, data - last); parsepkt->flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY; keyframes = (keyframes >> 2) + (keyframes<<62); data += sizeof(fuzz_tag); last = data; while (parsepkt->size > 0) { int decode_more; if (parser) { int ret = av_parser_parse2(parser, parser_avctx, &avpkt->data, &avpkt->size, parsepkt->data, parsepkt->size, parsepkt->pts, parsepkt->dts, parsepkt->pos); if (avpkt->data == parsepkt->data) { avpkt->buf = av_buffer_ref(parsepkt->buf); if (!avpkt->buf) error("Failed memory allocation"); } else { if (av_packet_make_refcounted(avpkt) < 0) error("Failed memory allocation"); } parsepkt->data += ret; parsepkt->size -= ret; parsepkt->pos += ret; avpkt->pts = parser->pts; avpkt->dts = parser->dts; avpkt->pos = parser->pos; if ( parser->key_frame == 1 || (parser->key_frame == -1 && parser->pict_type == AV_PICTURE_TYPE_I)) avpkt->flags |= AV_PKT_FLAG_KEY; avpkt->flags |= parsepkt->flags & AV_PKT_FLAG_DISCARD; } else { av_packet_move_ref(avpkt, parsepkt); } if (!(flushpattern & 7)) avcodec_flush_buffers(ctx); flushpattern = (flushpattern >> 3) + (flushpattern << 61); if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE) { int ret = avcodec_send_packet(ctx, avpkt); av_assert0(ret != AVERROR_BUG); decode_more = ret >= 0; if(!decode_more) { ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL); if (it > 20 || ec_pixels > 4 * ctx->max_pixels) { ctx->error_concealment = 0; ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE); } if (ec_pixels > maxpixels) goto maximums_reached; } } else decode_more = 1; // Iterate through all data while (decode_more && it++ < maxiteration) { av_frame_unref(frame); int ret = decode_handler(ctx, frame, &got_frame, avpkt); ec_pixels += (ctx->width + 32LL) * (ctx->height + 32LL); if (it > 20 || ec_pixels > 4 * ctx->max_pixels) { ctx->error_concealment = 0; ctx->debug &= ~(FF_DEBUG_SKIP | FF_DEBUG_QP | FF_DEBUG_MB_TYPE); } if (ec_pixels > maxpixels) goto maximums_reached; if (ctx->codec_type == AVMEDIA_TYPE_AUDIO && frame->nb_samples == 0 && !got_frame && (avpkt->flags & AV_PKT_FLAG_DISCARD)) nb_samples += ctx->max_samples; nb_samples += frame->nb_samples; if (nb_samples > maxsamples) goto maximums_reached; if (ret <= 0 || ret > avpkt->size) break; if (ctx->codec_type == AVMEDIA_TYPE_SUBTITLE) { avpkt->data += ret; avpkt->size -= ret; decode_more = avpkt->size > 0; } else decode_more = ret >= 0; } av_packet_unref(avpkt); } av_packet_unref(parsepkt); } maximums_reached: av_packet_unref(avpkt); if (ctx->codec_type != AVMEDIA_TYPE_SUBTITLE) { int ret = avcodec_send_packet(ctx, NULL); av_assert0(ret != AVERROR_BUG); } do { got_frame = 0; av_frame_unref(frame); decode_handler(ctx, frame, &got_frame, avpkt); nb_samples += frame->nb_samples; if (nb_samples > maxsamples) break; } while (got_frame == 1 && it++ < maxiteration); // fprintf(stderr, "pixels decoded: %"PRId64", samples decoded: %"PRId64", iterations: %d\n", ec_pixels, nb_samples, it); av_frame_free(&frame); avcodec_free_context(&ctx); avcodec_free_context(&parser_avctx); av_parser_close(parser); av_packet_free(&avpkt); av_packet_free(&parsepkt); av_dict_free(&opts); return 0; }