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https://github.com/FFmpeg/FFmpeg.git
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167b4f56f1
Fixes: division by zero Fixes: 57828/clusterfuzz-testcase-minimized-ffmpeg_dem_RKA_fuzzer-6571818338353152 Found-by: continuous fuzzing process https://github.com/google/oss-fuzz/tree/master/projects/ffmpeg Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>
174 lines
4.8 KiB
C
174 lines
4.8 KiB
C
/*
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* RKA demuxer
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* Copyright (c) 2023 Paul B Mahol
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*
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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 "libavutil/dict.h"
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#include "libavutil/intreadwrite.h"
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#include "apetag.h"
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#include "avformat.h"
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#include "avio_internal.h"
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#include "demux.h"
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#include "internal.h"
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typedef struct RKAContext {
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int total_frames, currentframe;
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int frame_size;
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int last_frame_size;
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} RKAContext;
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static int rka_probe(const AVProbeData *p)
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{
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if (AV_RL32(&p->buf[0]) == MKTAG('R', 'K', 'A', '7') &&
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AV_RL32(&p->buf[4]) > 0 &&
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AV_RL32(&p->buf[8]) > 0 &&
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p->buf[12] > 0 &&
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p->buf[12] <= 2 &&
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(p->buf[13] == 8 || p->buf[13] == 16) &&
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(p->buf[15] & 2) != 0)
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return AVPROBE_SCORE_EXTENSION + 30;
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return 0;
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}
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static int rka_read_header(AVFormatContext *s)
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{
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int64_t nb_samples, size_offset;
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RKAContext *c = s->priv_data;
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int channels, bps, samplerate;
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AVCodecParameters *par;
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int64_t framepos;
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AVStream *st;
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int ret;
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st = avformat_new_stream(s, NULL);
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if (!st)
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return AVERROR(ENOMEM);
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par = st->codecpar;
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ret = ff_get_extradata(s, par, s->pb, 16);
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if (ret < 0)
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return ret;
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nb_samples = AV_RL32(par->extradata + 4);
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samplerate = AV_RL32(par->extradata + 8);
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channels = par->extradata[12];
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if (channels == 0)
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return AVERROR_INVALIDDATA;
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bps = par->extradata[13];
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if (bps < 8)
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return AVERROR_INVALIDDATA;
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size_offset = avio_rl32(s->pb);
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framepos = avio_tell(s->pb);
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c->frame_size = 131072;
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avpriv_set_pts_info(st, 64, 1, samplerate);
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st->start_time = 0;
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avio_seek(s->pb, size_offset, SEEK_SET);
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c->total_frames = (nb_samples + c->frame_size - 1) / c->frame_size;
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c->last_frame_size = nb_samples % c->frame_size;
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for (int i = 0; i < c->total_frames; i++) {
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int r, end = 0;
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int64_t size;
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if (avio_feof(s->pb))
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break;
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size = avio_rl24(s->pb);
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if (size == 0) {
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end = 1;
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size = size_offset - framepos;
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if (size <= 0)
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break;
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}
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if ((r = av_add_index_entry(st, framepos, (i * 131072LL) / (channels * (bps >> 3)),
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size, 0, AVINDEX_KEYFRAME)) < 0)
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return r;
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framepos += size;
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if (end)
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break;
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}
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par->codec_type = AVMEDIA_TYPE_AUDIO;
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par->codec_id = AV_CODEC_ID_RKA;
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par->ch_layout.nb_channels = channels;
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par->sample_rate = samplerate;
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par->bits_per_raw_sample = bps;
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st->duration = 8LL*nb_samples / (channels * bps);
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if (s->pb->seekable & AVIO_SEEKABLE_NORMAL)
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ff_ape_parse_tag(s);
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avio_seek(s->pb, 20, SEEK_SET);
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return 0;
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}
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static int rka_read_packet(AVFormatContext *s, AVPacket *pkt)
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{
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RKAContext *c = s->priv_data;
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AVStream *st = s->streams[0];
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FFStream *const sti = ffstream(st);
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int size, ret;
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if (avio_feof(s->pb))
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return AVERROR_EOF;
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if (c->currentframe >= sti->nb_index_entries)
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return AVERROR_EOF;
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size = sti->index_entries[c->currentframe].size;
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ret = av_get_packet(s->pb, pkt, size);
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pkt->dts = sti->index_entries[c->currentframe++].timestamp;
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pkt->duration = c->currentframe == c->total_frames ? c->last_frame_size :
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131072;
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return ret;
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}
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static int rka_read_seek(AVFormatContext *s, int stream_index, int64_t timestamp, int flags)
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{
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RKAContext *c = s->priv_data;
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AVStream *st = s->streams[stream_index];
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int index = av_index_search_timestamp(st, timestamp, flags);
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if (index < 0)
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return -1;
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if (avio_seek(s->pb, ffstream(st)->index_entries[index].pos, SEEK_SET) < 0)
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return -1;
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c->currentframe = index;
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return 0;
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}
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const AVInputFormat ff_rka_demuxer = {
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.name = "rka",
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.long_name = NULL_IF_CONFIG_SMALL("RKA (RK Audio)"),
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.priv_data_size = sizeof(RKAContext),
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.read_probe = rka_probe,
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.read_header = rka_read_header,
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.read_packet = rka_read_packet,
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.read_seek = rka_read_seek,
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.extensions = "rka",
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};
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