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790f793844
There are lots of files that don't need it: The number of object files that actually need it went down from 2011 to 884 here. Keep it for external users in order to not cause breakages. Also improve the other headers a bit while just at it. Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
227 lines
6.2 KiB
C
227 lines
6.2 KiB
C
/*
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* This file is part of FFmpeg.
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*
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* FFmpeg is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* FFmpeg is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with FFmpeg; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include "config.h"
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#include "libavutil/avassert.h"
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#include "libavutil/avstring.h"
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#include "libavutil/mem.h"
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#include "libavcodec/avcodec.h"
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#include "libavcodec/bytestream.h"
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#include "libavformat/avformat.h"
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#include "libavformat/demux.h"
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typedef struct IOContext {
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int64_t pos;
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int64_t filesize;
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uint8_t *fuzz;
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int fuzz_size;
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} IOContext;
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size);
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int64_t interrupt_counter;
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static int interrupt_cb(void *ctx)
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{
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interrupt_counter --;
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return interrupt_counter < 0;
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}
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static void error(const char *err)
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{
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fprintf(stderr, "%s", err);
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exit(1);
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}
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static int io_read(void *opaque, uint8_t *buf, int buf_size)
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{
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IOContext *c = opaque;
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int size = FFMIN(buf_size, c->fuzz_size);
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if (!c->fuzz_size) {
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c->filesize = FFMIN(c->pos, c->filesize);
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return AVERROR_EOF;
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}
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if (c->pos > INT64_MAX - size)
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return AVERROR(EIO);
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memcpy(buf, c->fuzz, size);
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c->fuzz += size;
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c->fuzz_size -= size;
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c->pos += size;
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c->filesize = FFMAX(c->filesize, c->pos);
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return size;
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}
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static int64_t io_seek(void *opaque, int64_t offset, int whence)
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{
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IOContext *c = opaque;
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if (whence == SEEK_CUR) {
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if (offset > INT64_MAX - c->pos)
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return -1;
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offset += c->pos;
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} else if (whence == SEEK_END) {
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if (offset > INT64_MAX - c->filesize)
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return -1;
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offset += c->filesize;
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} else if (whence == AVSEEK_SIZE) {
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return c->filesize;
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}
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if (offset < 0 || offset > c->filesize)
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return -1;
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if (IO_FLAT) {
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c->fuzz += offset - c->pos;
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c->fuzz_size -= offset - c->pos;
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}
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c->pos = offset;
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return 0;
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}
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// Ensure we don't loop forever
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const uint32_t maxiteration = 8096;
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const int maxblocks= 50000;
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static const uint64_t FUZZ_TAG = 0x4741542D5A5A5546ULL;
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int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
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const uint64_t fuzz_tag = FUZZ_TAG;
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uint32_t it = 0;
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AVFormatContext *avfmt = avformat_alloc_context();
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AVPacket *pkt;
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char filename[1025] = {0};
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AVIOContext *fuzzed_pb = NULL;
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uint8_t *io_buffer;
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int io_buffer_size = 32768;
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int64_t filesize = size;
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IOContext opaque;
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static int c;
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int seekable = 0;
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int ret;
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const AVInputFormat *fmt = NULL;
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#ifdef FFMPEG_DEMUXER
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#define DEMUXER_SYMBOL0(DEMUXER) ff_##DEMUXER##_demuxer
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#define DEMUXER_SYMBOL(DEMUXER) DEMUXER_SYMBOL0(DEMUXER)
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extern const FFInputFormat DEMUXER_SYMBOL(FFMPEG_DEMUXER);
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fmt = &DEMUXER_SYMBOL(FFMPEG_DEMUXER).p;
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#endif
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if (!c) {
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av_log_set_level(AV_LOG_PANIC);
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c=1;
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}
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if (!avfmt)
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error("Failed avformat_alloc_context()");
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if (IO_FLAT) {
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seekable = 1;
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io_buffer_size = size;
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} else if (size > 2048) {
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int flags;
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char extension[64];
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GetByteContext gbc;
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memcpy (filename, data + size - 1024, 1024);
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bytestream2_init(&gbc, data + size - 2048, 1024);
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size -= 2048;
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io_buffer_size = bytestream2_get_le32(&gbc) & 0xFFFFFFF;
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flags = bytestream2_get_byte(&gbc);
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seekable = flags & 1;
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filesize = bytestream2_get_le64(&gbc) & 0x7FFFFFFFFFFFFFFF;
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if ((flags & 2) && strlen(filename) < sizeof(filename) / 2) {
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const AVInputFormat *avif = NULL;
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void *avif_iter = NULL;
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int avif_count = 0;
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while ((avif = av_demuxer_iterate(&avif_iter))) {
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if (avif->extensions)
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avif_count ++;
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}
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avif_count = bytestream2_get_le32(&gbc) % avif_count;
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avif_iter = NULL;
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while ((avif = av_demuxer_iterate(&avif_iter))) {
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if (avif->extensions)
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if (!avif_count--)
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break;
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}
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av_strlcpy(extension, avif->extensions, sizeof(extension));
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if (strchr(extension, ','))
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*strchr(extension, ',') = 0;
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av_strlcatf(filename, sizeof(filename), ".%s", extension);
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}
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interrupt_counter = bytestream2_get_le32(&gbc);
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avfmt->interrupt_callback.callback = interrupt_cb;
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}
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// HLS uses a loop with sleep, we thus must breakout or we timeout
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if (fmt && !strcmp(fmt->name, "hls"))
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interrupt_counter &= 31;
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if (!io_buffer_size || size / io_buffer_size > maxblocks)
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io_buffer_size = size;
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pkt = av_packet_alloc();
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if (!pkt)
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error("Failed to allocate pkt");
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io_buffer = av_malloc(io_buffer_size);
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if (!io_buffer)
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error("Failed to allocate io_buffer");
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opaque.filesize = filesize;
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opaque.pos = 0;
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opaque.fuzz = data;
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opaque.fuzz_size= size;
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fuzzed_pb = avio_alloc_context(io_buffer, io_buffer_size, 0, &opaque,
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io_read, NULL, seekable ? io_seek : NULL);
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if (!fuzzed_pb)
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error("avio_alloc_context failed");
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avfmt->pb = fuzzed_pb;
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ret = avformat_open_input(&avfmt, filename, fmt, NULL);
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if (ret < 0) {
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goto fail;
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}
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ret = avformat_find_stream_info(avfmt, NULL);
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//TODO, test seeking
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for(it = 0; it < maxiteration; it++) {
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ret = av_read_frame(avfmt, pkt);
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if (ret < 0)
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break;
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av_packet_unref(pkt);
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}
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fail:
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av_packet_free(&pkt);
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av_freep(&fuzzed_pb->buffer);
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avio_context_free(&fuzzed_pb);
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avformat_close_input(&avfmt);
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return 0;
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}
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