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"
25 #include "libavcodec/bsf_internal.h"
26 #include "libavcodec/bytestream.h"
27 #include "libavcodec/internal.h"
28
29 int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
30
error(const char * err)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
LLVMFuzzerTestOneInput(const uint8_t * data,size_t size)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 *pkt;
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
58 av_log_set_level(AV_LOG_PANIC);
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->ch_layout.nb_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 pkt = av_packet_alloc();
122 if (!pkt)
123 error("Failed memory allocation");
124
125 while (data < end) {
126 // Search for the TAG
127 while (data + sizeof(fuzz_tag) < end) {
128 if (data[0] == (fuzz_tag & 0xFF) && AV_RN64(data) == fuzz_tag)
129 break;
130 data++;
131 }
132 if (data + sizeof(fuzz_tag) > end)
133 data = end;
134
135 res = av_new_packet(pkt, data - last);
136 if (res < 0)
137 error("Failed memory allocation");
138 memcpy(pkt->data, last, data - last);
139 pkt->flags = (keyframes & 1) * AV_PKT_FLAG_DISCARD + (!!(keyframes & 2)) * AV_PKT_FLAG_KEY;
140 keyframes = (keyframes >> 2) + (keyframes<<62);
141 data += sizeof(fuzz_tag);
142 last = data;
143
144 if (!(flushpattern & 7))
145 av_bsf_flush(bsf);
146 flushpattern = (flushpattern >> 3) + (flushpattern << 61);
147
148 res = av_bsf_send_packet(bsf, pkt);
149 if (res < 0) {
150 av_packet_unref(pkt);
151 continue;
152 }
153 while (av_bsf_receive_packet(bsf, pkt) >= 0)
154 av_packet_unref(pkt);
155 }
156
157 av_bsf_send_packet(bsf, NULL);
158 while (av_bsf_receive_packet(bsf, pkt) >= 0)
159 av_packet_unref(pkt);
160
161 av_packet_free(&pkt);
162 av_bsf_free(&bsf);
163 return 0;
164 }
165