FFmpeg
target_bsf_fuzzer.c
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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 #include "config.h"
20 #include "libavutil/imgutils.h"
21 #include "libavutil/opt.h"
22 
23 #include "libavcodec/avcodec.h"
24 #include "libavcodec/bsf.h"
26 #include "libavcodec/bytestream.h"
27 #include "libavcodec/internal.h"
28 
29 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
30 
31 static void error(const char *err)
32 {
33  fprintf(stderr, "%s", err);
34  exit(1);
35 }
36 
37 static const AVBitStreamFilter *f = NULL;
38 
39 static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
40 
41 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
42  const uint64_t fuzz_tag = FUZZ_TAG;
43  const uint8_t *last = data;
44  const uint8_t *end = data + size;
45  AVBSFContext *bsf = NULL;
46  AVPacket *in, *out;
47  uint64_t keyframes = 0;
48  uint64_t flushpattern = -1;
49  int res;
50 
51  if (!f) {
52 #ifdef FFMPEG_BSF
53 #define BSF_SYMBOL0(BSF) ff_##BSF##_bsf
54 #define BSF_SYMBOL(BSF) BSF_SYMBOL0(BSF)
55  extern const AVBitStreamFilter BSF_SYMBOL(FFMPEG_BSF);
56  f = &BSF_SYMBOL(FFMPEG_BSF);
57 #endif
59  }
60 
61  res = f ? av_bsf_alloc(f, &bsf) : av_bsf_get_null_filter(&bsf);
62  if (res < 0)
63  error("Failed memory allocation");
64  f = bsf->filter;
65 
66  if (size > 1024) {
67  GetByteContext gbc;
68  int extradata_size;
69  int flags;
70  size -= 1024;
71  bytestream2_init(&gbc, data + size, 1024);
72  bsf->par_in->width = bytestream2_get_le32(&gbc);
73  bsf->par_in->height = bytestream2_get_le32(&gbc);
74  bsf->par_in->bit_rate = bytestream2_get_le64(&gbc);
75  bsf->par_in->bits_per_coded_sample = bytestream2_get_le32(&gbc);
76 
77  if (f->codec_ids) {
78  int i, id;
79  for (i = 0; f->codec_ids[i] != AV_CODEC_ID_NONE; i++);
80  id = f->codec_ids[bytestream2_get_byte(&gbc) % i];
81  bsf->par_in->codec_id = id;
82  bsf->par_in->codec_tag = bytestream2_get_le32(&gbc);
83  }
84 
85  extradata_size = bytestream2_get_le32(&gbc);
86 
87  bsf->par_in->sample_rate = bytestream2_get_le32(&gbc);
88  bsf->par_in->channels = (unsigned)bytestream2_get_le32(&gbc) % FF_SANE_NB_CHANNELS;
89  bsf->par_in->block_align = bytestream2_get_le32(&gbc);
90  keyframes = bytestream2_get_le64(&gbc);
91  flushpattern = bytestream2_get_le64(&gbc);
92  flags = bytestream2_get_byte(&gbc);
93 
94  if (flags & 0x20) {
95  if (!strcmp(f->name, "av1_metadata"))
96  av_opt_set_int(bsf->priv_data, "td", bytestream2_get_byte(&gbc) % 3, 0);
97  else if (!strcmp(f->name, "h264_metadata") || !strcmp(f->name, "h265_metadata"))
98  av_opt_set_int(bsf->priv_data, "aud", bytestream2_get_byte(&gbc) % 3, 0);
99  else if (!strcmp(f->name, "extract_extradata"))
100  av_opt_set_int(bsf->priv_data, "remove", bytestream2_get_byte(&gbc) & 1, 0);
101  }
102 
103  if (extradata_size < size) {
104  bsf->par_in->extradata = av_mallocz(extradata_size + AV_INPUT_BUFFER_PADDING_SIZE);
105  if (bsf->par_in->extradata) {
106  bsf->par_in->extradata_size = extradata_size;
107  size -= bsf->par_in->extradata_size;
108  memcpy(bsf->par_in->extradata, data + size, bsf->par_in->extradata_size);
109  }
110  }
111  if (av_image_check_size(bsf->par_in->width, bsf->par_in->height, 0, bsf))
112  bsf->par_in->width = bsf->par_in->height = 0;
113  }
114 
115  res = av_bsf_init(bsf);
116  if (res < 0) {
117  av_bsf_free(&bsf);
118  return 0; // Failure of av_bsf_init() does not imply that a issue was found
119  }
120 
121  in = av_packet_alloc();
122  out = av_packet_alloc();
123  if (!in || !out)
124  error("Failed memory allocation");
125 
126  while (data < end) {
127  // Search for the TAG
128  while (data + sizeof(fuzz_tag) < end) {
129  if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
130  break;
131  data++;
132  }
133  if (data + sizeof(fuzz_tag) > end)
134  data = end;
135 
136  res = av_new_packet(in, data - last);
137  if (res < 0)
138  error("Failed memory allocation");
139  memcpy(in->data, last, data - last);
140  in->flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
141  keyframes = (keyframes >> 2) + (keyframes<<62);
142  data += sizeof(fuzz_tag);
143  last = data;
144 
145  if (!(flushpattern & 7))
146  av_bsf_flush(bsf);
147  flushpattern = (flushpattern >> 3) + (flushpattern << 61);
148 
149  while (in->size) {
150  res = av_bsf_send_packet(bsf, in);
151  if (res < 0 && res != AVERROR(EAGAIN))
152  break;
153  res = av_bsf_receive_packet(bsf, out);
154  if (res < 0)
155  break;
157  }
158  av_packet_unref(in);
159  }
160 
161  res = av_bsf_send_packet(bsf, NULL);
162  while (!res) {
163  res = av_bsf_receive_packet(bsf, out);
164  if (res < 0)
165  break;
167  }
168 
169  av_packet_free(&in);
171  av_bsf_free(&bsf);
172  return 0;
173 }
error
static void error(const char *err)
Definition: target_bsf_fuzzer.c:31
av_packet_unref
void av_packet_unref(AVPacket *pkt)
Wipe the packet.
Definition: avpacket.c:417
AVBSFContext::par_in
AVCodecParameters * par_in
Parameters of the input stream.
Definition: bsf.h:69
AVCodecParameters::extradata
uint8_t * extradata
Extra binary data needed for initializing the decoder, codec-dependent.
Definition: codec_par.h:74
AVERROR
Filter the word “frame” indicates either a video frame or a group of audio as stored in an AVFrame structure Format for each input and each output the list of supported formats For video that means pixel format For audio that means channel sample they are references to shared objects When the negotiation mechanism computes the intersection of the formats supported at each end of a all references to both lists are replaced with a reference to the intersection And when a single format is eventually chosen for a link amongst the remaining all references to the list are updated That means that if a filter requires that its input and output have the same format amongst a supported all it has to do is use a reference to the same list of formats query_formats can leave some formats unset and return AVERROR(EAGAIN) to cause the negotiation mechanism toagain later. That can be used by filters with complex requirements to use the format negotiated on one link to set the formats supported on another. Frame references ownership and permissions
bsf_internal.h
opt.h
out
FILE * out
Definition: movenc.c:54
GetByteContext
Definition: bytestream.h:33
AV_LOG_PANIC
#define AV_LOG_PANIC
Something went really wrong and we will crash now.
Definition: log.h:167
AV_PKT_FLAG_DISCARD
#define AV_PKT_FLAG_DISCARD
Flag is used to discard packets which are required to maintain valid decoder state but are not requir...
Definition: packet.h:432
AVBitStreamFilter::name
const char * name
Definition: bsf.h:91
av_bsf_init
int av_bsf_init(AVBSFContext *ctx)
Prepare the filter for use, after all the parameters and options have been set.
Definition: bsf.c:145
AV_RN64
#define AV_RN64(p)
Definition: intreadwrite.h:368
internal.h
AVPacket::data
uint8_t * data
Definition: packet.h:373
data
const char data[16]
Definition: mxf.c:143
AVCodecParameters::codec_tag
uint32_t codec_tag
Additional information about the codec (corresponds to the AVI FOURCC).
Definition: codec_par.h:64
AV_PKT_FLAG_KEY
#define AV_PKT_FLAG_KEY
The packet contains a keyframe.
Definition: packet.h:425
av_packet_free
void av_packet_free(AVPacket **pkt)
Free the packet, if the packet is reference counted, it will be unreferenced first.
Definition: avpacket.c:75
AVBSFContext
The bitstream filter state.
Definition: bsf.h:47
AVCodecParameters::channels
int channels
Audio only.
Definition: codec_par.h:166
bsf.h
LLVMFuzzerTestOneInput
int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size)
Definition: target_bsf_fuzzer.c:41
av_bsf_get_null_filter
int av_bsf_get_null_filter(AVBSFContext **bsf)
Get null/pass-through bitstream filter.
Definition: bsf.c:549
av_new_packet
int av_new_packet(AVPacket *pkt, int size)
Allocate the payload of a packet and initialize its fields with default values.
Definition: avpacket.c:99
AVCodecParameters::width
int width
Video only.
Definition: codec_par.h:126
FUZZ_TAG
static const uint64_t FUZZ_TAG
Definition: target_bsf_fuzzer.c:39
f
static const AVBitStreamFilter * f
Definition: target_bsf_fuzzer.c:37
AVBitStreamFilter::codec_ids
enum AVCodecID * codec_ids
A list of codec ids supported by the filter, terminated by AV_CODEC_ID_NONE.
Definition: bsf.h:98
NULL
#define NULL
Definition: coverity.c:32
AVCodecParameters::sample_rate
int sample_rate
Audio only.
Definition: codec_par.h:170
av_opt_set_int
int av_opt_set_int(void *obj, const char *name, int64_t val, int search_flags)
Definition: opt.c:586
AVCodecParameters::extradata_size
int extradata_size
Size of the extradata content in bytes.
Definition: codec_par.h:78
AVPacket::size
int size
Definition: packet.h:374
id
enum AVCodecID id
Definition: extract_extradata_bsf.c:325
size
int size
Definition: twinvq_data.h:10344
AVPacket::flags
int flags
A combination of AV_PKT_FLAG values.
Definition: packet.h:379
av_packet_alloc
AVPacket * av_packet_alloc(void)
Allocate an AVPacket and set its fields to default values.
Definition: avpacket.c:64
av_log_set_level
void av_log_set_level(int level)
Set the log level.
Definition: log.c:440
i
int i
Definition: input.c:406
AV_CODEC_ID_NONE
@ AV_CODEC_ID_NONE
Definition: codec_id.h:48
av_bsf_receive_packet
int av_bsf_receive_packet(AVBSFContext *ctx, AVPacket *pkt)
Retrieve a filtered packet.
Definition: bsf.c:226
AVCodecParameters::height
int height
Definition: codec_par.h:127
AVCodecParameters::block_align
int block_align
Audio only.
Definition: codec_par.h:177
av_mallocz
void * av_mallocz(size_t size)
Allocate a memory block with alignment suitable for all memory accesses (including vectors if availab...
Definition: mem.c:261
avcodec.h
AVBSFContext::priv_data
void * priv_data
Opaque filter-specific private data.
Definition: bsf.h:62
AV_INPUT_BUFFER_PADDING_SIZE
#define AV_INPUT_BUFFER_PADDING_SIZE
Definition: defs.h:40
av_bsf_send_packet
int av_bsf_send_packet(AVBSFContext *ctx, AVPacket *pkt)
Submit a packet for filtering.
Definition: bsf.c:198
av_bsf_flush
void av_bsf_flush(AVBSFContext *ctx)
Reset the internal bitstream filter state.
Definition: bsf.c:186
AVBitStreamFilter
Definition: bsf.h:90
AVBSFContext::filter
const struct AVBitStreamFilter * filter
The bitstream filter this context is an instance of.
Definition: bsf.h:56
AVCodecParameters::bits_per_coded_sample
int bits_per_coded_sample
The number of bits per sample in the codedwords.
Definition: codec_par.h:102
AVCodecParameters::codec_id
enum AVCodecID codec_id
Specific type of the encoded data (the codec used).
Definition: codec_par.h:60
AVPacket
This structure stores compressed data.
Definition: packet.h:350
av_bsf_free
void av_bsf_free(AVBSFContext **pctx)
Free a bitstream filter context and everything associated with it; write NULL into the supplied point...
Definition: bsf.c:48
bytestream.h
imgutils.h
bytestream2_init
static av_always_inline void bytestream2_init(GetByteContext *g, const uint8_t *buf, int buf_size)
Definition: bytestream.h:137
flags
#define flags(name, subs,...)
Definition: cbs_av1.c:561
AVCodecParameters::bit_rate
int64_t bit_rate
The average bitrate of the encoded data (in bits per second).
Definition: codec_par.h:89
av_image_check_size
int av_image_check_size(unsigned int w, unsigned int h, int log_offset, void *log_ctx)
Check if the given dimension of an image is valid, meaning that all bytes of the image can be address...
Definition: imgutils.c:318
FF_SANE_NB_CHANNELS
#define FF_SANE_NB_CHANNELS
Definition: internal.h:101
av_bsf_alloc
int av_bsf_alloc(const AVBitStreamFilter *filter, AVBSFContext **pctx)
Allocate a context for a given bitstream filter.
Definition: bsf.c:100